Metering Manual- Pgcil

MANUAL ON SPECIAL ENERGY METER,

DATA PROCESSING &

COMPUTATION

NORTH EASTERN REGIONAL LOAD DESPATCH CENTRE POWERGRID CORPORATION OF INDIA LIMITED

SHILLONG

MANUAL ON

SPECIAL ENERGY METER, DATA PROCESSING

& COMPUTATION

June 2008 Commercial & Operation Services Department

NORTH EASTERN REGIONAL LOAD DESPATCH CENTRE POWERGRID CORPORATION OF INDIA LIMITED

SHILLONG

CONTENTS Page No. Foreword …...…………………………………………………………………….. 1 Section-1: Special Energy Meter & Data Collecting Device

1.1 Special Energy Meter (SEM) ………………………………………… 3 1.2 Data Collecting Device (DCD) ………………………………………. 6 Section-2: Regulatory Requirements of Meters & SEMs in NER

2.1 Metering Philosophy of CEA …………………………………………. 7 2.2 Regulatory Requirements of SEMs …………………………...……….. 8 2.3 Philosophy for Installation of SEMs in NER ………………….….…… 9 2.4 Utility wise Meters in NER …………………………………………… 9 2.5 Constituent wise Metering Arrangement ……….…………….……….. 10 2.6 Master Database of SEMs in NER ……………………………………. 22 Section-3: Meter Data Collection & Transmittal to RLDC

3.1 Data Collection from Meters ………………………………………….. 26 The RS-485 Scheme ..………………………………………………...... 33

3.2 Data Collection Locations in NER ……………………………………. 36 3.3 Automating Meter Data Collection/Transmission …..…………………. 37

Section-4: Data Processing & Computation

4.1 Receipt of SEM Data at RLDC ………………………….…………….. 38 4.2 Softwares for Data Viewing / Conversion to TEXT File ……………… 38 4.3 Appending Text Files ………………………………………………….. 55 4.4 Processing of SEM Data/Computation of Net Injection & Drawal …… 58 4.5 Finally Implemented Schedule ……….………………………….……... 67

4.6 Sending Data to RPC ……………………………………………….…... 69 4.7 UI Computation ……………………………………………….………... 71 4.8 Post Processing & Data Archival …………………………………….... 76 Annexures

Annexure-1: Write-up on RS-485, RS-232 Standards ……………………. 79 Annexure-2: VINCOM software for L&T meters – Deficiencies ………… 85

1

Foreword

Special Energy Meter (SEM) with Data Collection device (DCD) was conceptualized and designed by POWERGRID in the beginning of 1990s to take care of metering requirements of bulk power tariff structure (post rationalization) in India in line with ECC recommendations which paved way for ABT (Availability Based Tariff) implementation in India. SEM/DCD was, therefore a special metering package, aimed at fulfilling metering needs of ABT era. North Eastern Region has the distinction of being the first region in the country to get SEMs installed during 1994-95, followed by Southern and Eastern Regions in the same year. As per IEGC provisions, CTU (POWERGRID) is responsible for installation as well as maintenance/testing of SEMs in ISTS. RLDCs validate and process the meter readings received from various locations for computation of REA. In case of any discrepancy/problem related to meter/accessories, RLDCs take up with respective RTS for rectification. In nutshell, metering activities are very streamlined and carried out in a specific time frame; (a) Meter/DCD Commissioning, Maintenance, Testing – CTU/RTS of

POWERGRID (b) Weekly Data Collection/Transmittal to RLDC – Metering Locations (CTU,

State, ISGS) (c) Data Processing, Validation, Computation, Accounting, Metering

Philosophy, Identification of Metering Locations – RLDC A metering manual cannot be complete unless all the above three activities are fully documented. A maiden attempt has been made by NERLDC to bring out a comprehensive manual on “Special Energy Meter, Data Processing & Computation” by compiling all the relevant aspects of metering. The manual unfolds with detailed description of SEM/DCD in Section-1 followed by the regulatory requirements with details of meter location in the region in Section-2. Section-3 covers in great length, data collection from meters and transmittal to RLDC with special emphasis on future road map to automate the system. Finally, data checking, data validation, computation and data archival, which are exclusive functions of RLDC, have been detailed in Section-4. Quite a large number of pictures and screen-shots have been used to enable any person, even not conversant with the subject, to also understand the entire chain of activity with effortless ease. Other meter related activities like maintenance, troubleshooting, time synchronization and testing etc have not been included to restrict the volume of the present manual. Section-4 on “Data Processing and Computation” would undergo revision/modification once we switch over from the existing DOS based software to ORACLE based common software (developed by WRLDC).

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This manual would not have been in place without active co-operation and

support from POWERGRID, NERTS as certain metering activities are exclusively carried out by them. We acknowledge the value addition by Sh. Ajoy Patir, AGM(O&M), Sh. Samiran Das (Dy. Mgr) and Sh. Abhijit Choudhury of T&C Department, Shillong, Sh. M. K. Baruah (CM) and Ms. Binita Sharma (AE) of Misa S/S. The manual has been drafted and designed at NERLDC by Sh. M. Hussain (Mgr), Sh. S. K. Saha (Dy. Mgr) and Ms. Pinki Debnath (AE) under the supervision of Sh. R. Sutradhar, CM.

Sh. S.K.Soonee, our ED(SO) is the inspiration behind this endeavor. His vision and guidance during 2nd metering and settlement meet held on 3rd & 4th March’08 has paved way for compilation of the manual.

First version of this manual is being released now. Revisions would be carried out by NERLDC as and when need arises.

SECTION 1

SPECIAL ENERGY METERS &

DATA COLLECTING DEVICE

3

1.1 Special Energy Meter (SEM)

1.1.1 SEM Concept

SEM is an Application specific Microprocessor base solid state energy meter. This together with a data collecting device (DCD) and a local Computer forms a powerful system of metering and data logging. This type of metering and data logging gives a unique method for measurement of all relevant electrical quantities. Taking help of the support software on a PC enables the user to process metered data and the data can also be viewed in a tabular format.

1.1.2 General Description of SEM • Static • Accuracy class of 0.2S as per IEC 62053 standard • Working voltage of 63.5V

LCD Display

Optical Port

Scroll Buttons

R Phase PT Lead

Y Phase PT Lead

B Phase PT Lead

Neutral Lead

RS-485 TB

B Phase CT Lead

R Phase CT Lead Y Phase

CT Lead

4

• Secondary current rating of 1A (A-type) and 5A(B-type) • Working range (-5 to 60 decC) • Real time clock (RTC) accuracy 30 sec/month • Extended temperature LCD for display • Rechargeable Ni-Cd battery with a push button on front panel to operate

during power failure • Off line data collection possible for 6-7 hrs during power off condition • Surface mounted, light in weight (<2.5kg) • Mounting can be done on a flat surface, one hole on top and two holes at the

bottom 1.1.3 Data Recording Format

Data recorded by the meters are normally not Windows readable. Therefore, data downloaded from the meters have to be first converted to Windows readable form, usually a text file, for computation and analysis. This is explained in detail in Section- 4. Conversion software is required for this purpose which is proprietary to the meter supplier. All data of last 10 full days’ plus the most recent complete 15 min block data up to the time of collection is available. Last ten (10) full day’s data remains in non-volatile memory of meter and is available on collection of data.

1.1.4 Measurement Principle

a) Wh Measurement

The active energy (Wh) measurements are carried out on 3-phase, 4-wire principle with an accuracy as per class 0.2S of IEC-687/IEC-62053-22. The meter computes the net active energy (Wh) in each successive 15-minutes block and stores it in its non-volatile memory along with plus/ minus sign. The 15-minute Wh shall have a +ve sign when there is a net Wh export and a –ve sign when there is a net Wh import. Cumulative Wh reading at each midnight shall be stored in the meters memory along with plus/ minus sign. The meter shall store all data in its memories for a period of ten (10) days. The data older than ten (10) days shall get erased automatically.

b) VARh Measurement

The meter shall also compute the reactive power (VAR) on a 3-phase 4-wire principle with an accuracy as per class 0.2S of IEC-687/IEC-62053-23. There shall be two reactive energy registers, one for the period when average RMS voltage is above 103% and the other for the period the voltage is below 97%. The registers will move forward when there is VARh export and will move backward when there is VARh import.

c) Average Frequency

The meter shall count the number of cycles in VT output during each successive 15-minute block and divide the same by 900 (15*60=900) to arrive at the average frequency. The average frequency is stored in meter’s memory in 2-digit code neglecting decimals. In case the average frequency is less than 49.0Hz, it is recorded as 00 and in case it is 51.0Hz or higher it is recorded as 99. The actual frequency corresponding to two consecutive codes differ by 0.02Hz.

5

1.1.5 Operating Section of the Meter a) Analog Section: High precision Current transformer and voltage transformer step

down input currents and voltages which are fed to an Analog to Digital converter. b) Digital Section: A powerful microprocessor controls the Analog and Digital

sections. Analog to Digital converters are fed from high precision instrument transformers. The Digital samples from Analog to Digital converter are used to process the metering data. The sampling rate is 3000 samples per second which gives the meter an exceptional accuracy and results.

c) Power supply Section: A switch mode power supply (SMPs) unit supplies

power to the meter’s internal circuit.

1.1.6 Display Parameters Special Energy Meters have the facility to display the following parameters: Display Parameter: Indication Display format 1. Meter identification code A NP1234A 2. Date (day, date, month, year) d dd-mm-yy 3. Time (hour, min, sec) t hh:mm:ss 4. Cumulative Wh reading c xxxx.x Wh 5. Reactive Power Pr xxx:x VAr 6. Average freq. of previous block F xx:xx 7. Net Wh transmittal-previous block E xx:xx 8. Average % voltage U xx:xx 9. Voltage high VArh register reading H xxxx:x VArh 10. Voltage low VArh register reading L xxxx:x VArh 11. Real time indication rtC Fit 12. Low battery indication Low Bat

1.1.7 Meter parts and overall dimension of the meter

CUTOUT

154 mm

150 mm

6 mm

25 mm

15 mm

262 mm

Mounting Holes

187+/- 2 mm

325+/- 2 mm77 mm

6

Standardization of meter dimension along with positioning of mounting holes is extremely important. This would enable easy replacement of a meter of any make with another without re-commissioning activity like drilling in panel, searching appropriate space for positioning of meter etc. Dimension of L&T make SEM as shown above is to be standardized as size of the SEM. This has been decided in second meeting of metering and settlement group of RLDCs held at New Delhi on 3rd & 4th March, 2008

1.2 Data Collecting Device (DCD)

a) DCD is a small hand held terminal having 2MB FLASH RAM memory, capable of communicating with SEM as well as Computer. Both communications require suitable software to be present at either end. DCD is normally battery operated (9-volt), comprising of a key-pad, LCD display and a communication slot. It is used for tapping data stored in a meter’s memory and transferring it to a Computer. Each DCD is supplied with two sets of communication cables.

i) Data Cable: RJ-11 (telephone jack) or round 9-pin male connector (D-

cable) at one end for connecting with DCD and 9-pin female connector at other end for connecting either with optical cable or PC.

ii) Optical Cable: A cable with optical head at one end for coupling with

SEM optical port and 9-pin male connector at other end for connection with data cable.

**************

LCD Display

9-Pin Connector

Power ON / OFF

Status LEDs

RJ-11 Port

45 key membrane

keypad

Battery Charging Socket

Data Cable D-Cable

SECTION 2

REGULATORY REQUIREMENTS OF METERS

& SEMs IN NER

7

2.1 Metering Philosopy of CEA (vide notification dated 17.03.06)

2.1.1 Types of Meters a) Interface Meter: Interface Meter means a Meter, connected at the point of interconnection with inter-State Transmission system (ISTS) for the purpose of electricity accounting and billing. Meter shall be owned by CTU.

b) Consumer meter: Consumer Meter means a Meter used for accounting and billing of electricity supplied to the consumer. Meter shall be owned by licensee.

c) Energy accounting meter: Energy Accounting and Audit Meter means Meter used for accounting of electricity to various segments of electrical system. Meter shall be owned by Generating Company or licensee

All interface meters, consumer meters and energy accounting and audit meter shall be of static type.

Note : Our focus is on SEMs which are interface meters. 2.1.2 Meter Standards

All interface meter, consumer meters, energy accounting and audit meters shall:

Comply with the relevant standards of Bureau of Indian Standards (BIS).

If BIS Standards are not available for a particular equipment or material, the relevant British Standards (BS), International Electro-technical Commission (IEC) Standards, or any other equivalent Standards shall be followed.

Provided that whenever an International Standard or IEC Standard is

followed, necessary corrections of modifications shall be made for nominal system frequency, nominal system voltage, ambient temperature, humidity and other conditions prevailing in India before actual adaption of the said Standard.

2.1.3 Accuracy Class of Meters

Every meter shall meet the following requirements of accuracy class as specified in the standards.

Interface Meter ……………………………………. 0.2S Consumer meters

Upto 650 Volts ………………………….…. 1.0S Above 650 Volts & upto 33kV ……………. 0.5S Above 33kV ……………………………….. 0.2S Energy accounting and audit meters …………….... 0.2S Accuracy of meters in Generation and Transmission system will be of 0.2S class.

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2.1.4 Testing of Meters

Meters shall be tested at site at least once in five years or whenever the

accuracy is suspected or the readings are inconsistent with the readings of the other meters. The testing must be carried out through National Accreditation Board for Testing and Calibration Laboratories (NABL) or any accredited test laboratory and recalibrated if required at manufacture’s works. The test must be carried out without removing the CTs and VTs connection

2.1.5 Location of Meters

Location Main Meter Check Meter Standby Meter

Generating Station

On all outgoing feeders

On all outgoing feeders

HV side of GT HV side of Station Aux. Transformers

Transmission System

At one end of the line between the S/Ss of the

same licensee and at the both ends of the line between S/Ss of

two different licensees. Meters at both ends

shall be considered as main meter.

----

There shall be no separate standby

meter.Meter installed at other ends of the

lines in case two different licensees

shall work as standby meter.

ICT HV side of ICT ----- LV side of ICT 2.2 Regulatory Requirements of SEMs (IEGC April’2006 issue) The following requirements are clearly stated in IEGC as regards SEMs:

a) The Special Energy Meters shall be static type, composite meters, installed circuit-wise, as self-contained device for measurement of Active and Reactive energy and certain other parameters.

b) The meters shall store the data in their memories for a period of ten (10) days.

The data older than 10-days shall get erased automatically. c) The Active energy measurement shall be carried out on a 3-phase, 4-wire

principle with an accuracy as per class 0.2S of IEC-687/IEC-62053-22. d) The VAR and reactive energy measurement shall be on 3-phase, 4-wire

principle with an accuracy as per class 0.2S of IEC-62053-23. There shall be two reactive energy registers, one for the period when average RMS voltage is above 103% and the other for the period when the voltage is below 97%.

e) The 15-minute Wh shall have a +ve sign when there is a net Wh export from

S/S busbars, and a –ve sign when there is a net Wh import. f) The three line-to-neutral voltages shall be continuously monitored, and in case

these falls below 70%, the condition shall be suitably indicated and recorded.

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g) The meters shall be totally sealed and tamper-proof, with no possibility of any adjustment at site except for a restricted clock correction.

h) Full testing for accuracy for every meter shall be carried out by the CTU at

accredited laboratory once in every five (5) years.

i) The current a voltage transformers to which the above special energy meters are connected shall have measurement accuracy class of 0.5 or better.

2.3 Philosophy for Installation of SEMs in NER

(A) Main meters

a) On all outgoing EHV feeders emanating from an ISGS b) On all identified inlet points of a state connected by EHV feeders.

(B) Back up meters

a) On EHV side of all GTs and STs at an ISGS. b) On one side of each CTU line connected between two CTU S/Ss c) On one side of each ICT connected between two EHV buses in CTU S/Ss. d) At CTU end of all EHV lines connected to State inlet points.

Philosophy adopted in NER before issue of CEA Metering Regulation, however, fulfils CEA metering philosophy. 2.4 Utility wise Meters in NER

Secure Make Sl. No.

Utilities No. of Locations A-Type B-Type

L&T Make

Total

1 AGBPP (NEEPCO) 1 - - 15 15 2 AGTPP (NEEPCO) 1 9 - - 9 3 DOYANG (NEEPCO) 1 - - 8 8 4 KHANDONG (NEEPCO) 1 13 - - 13 5 KOPILI (NEEPCO) 1 7 - - 7 6 KOPILI-II (NEEPCO) 1 2 - - 2 7 RANGANADI (NEEPCO) 1 - - 11 11 8 LOKTAK (NHPC) 1 8 - - 8 9 Arunachal Pradesh 2 1 - 1 2 10 Assam 14 17 3 4 24 11 Manipur 3 5 - - 5 12 Meghalaya 4 7 - - 7 13 Mizoram 2 5 - - 5 14 Nagaland 3 5 - - 5 15 Tripura 5 6 1 - 7 16 POWERGRID 15 25 - 48 73

TOTAL 56 110 4 87 201

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2.5 Contituent wise Metering Arrangement The metering arrangements for the constituents of NER are shown below:

AR. PRADESH interconnection with Grid

Bokajan

LEGEND

Following main and back up meters are used for calculating Ar. Pradesh state

drawal. Location ID of AP SEM is denoted as AR-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID

AR-01 Nirjuli Transformer Incomer-I * AR-02 Nirjuli Transformer Incomer-II * AR-05 132 KV Naharlagun Feeder (AR-03)+(RN-01) AR-06 132 KV Ziro Ranganadi Feeder RN-11 KT-14 132 KV Deomali Kathalguri AR-07 AS-54 Balipara Khupi ICT AS-55 AS-48 33 KV Rupai Namsai ** AS-49 33 KV Lekhapani Jairampur ** * Using net bus of Nirjuli(PG) substation. ** No back up for SEMs at 33 KV feeders, average reading of previous period taken in case of non-availbility of meter reading.

Fictitious meters are physically non-existent and are introduced for convenience

of computation. For Net Drawal of Ar. Pradesh, one fictitious meter AR-51 is used.

(AR-51) = -(AR-01) - (AR-02) - (AR-05) - (AR-06) + (KT-14) + (AS-54) + (AS-48) + (AS-49) In fictitious meter, ( - ) is used if SEM is installed at inlet/injection point end. ( + ) is used if SEM is installed at the other end.

AR. PRADESH

C E N T R A L

S E C T O R

Rupai

A

S

S

A

M

Namsai

AS-48

Lekhapani

AS-49Jairampur

Ranganadi Ziro

RN-11AR-06

Nirjuli TRF-I

AR-01

Naharlagun Tapping

AR-05 Nirjuli

Ranganadi

AR-03

RN-01

Back Up Meter Main Meter

220KV State 132KV State

132KV Line 33KV Line

Balipara Khupi ICT

AS-54 AS-55

Deomali

AR-07 KT-14

Nirjuli TRF-II

AR-02

11

ASEB interconnection with Grid

Bokajan

Rupai

LEGEND

A S E B

C E N T R A L S E C T O R

RupaiAP

Namsai AS-48

L’Pani

AS-49

Jairampur

NAGALAND

Mariani

Chanki AS-47

N’mora

G’gaon

AS-46

MarianiM’Chang

AS-52NG-12Bokajan

AS-12NG-03

Dimapur

Samaguri-I Misa

AS-17 AS-38SalakatiBTPS-I

AS-30 AS-16

Samaguri-II Misa

AS-18 AS-39

JiribamP’Pool

MN-06AS-10

Mariani Dimapur

AS-05 NG-08

Mariani Kathalguri

AS-03 KT-01

B’pur(ASEB) B’Pur(PG)

AS- 22AS-07

MisaMariani

AS-37AS-04

T R I P U R A

D’Cherra D’Nagar

AS-08TR-06SalakatiBTPS-II

AS-31 AS-15

Gohpur Nirjuli

AS-13 AG-04

Umrangsoo Consumption

AS-14Haflong Consumption

AS-11

Balipara Samaguri

AS-42 AS-19

Tinsukia Kathalguri

AS-53 KT-15


220KV Line 220KV State


33KV Damsite(NEEPCo)

KK-20

M E G H A L A Y A S’Sujai

ME-05Stage-IV

AS-50Ckt-II

Umtru-II

AS-02

Kahelipara

ME-04

AS-06

ME-01

Lumshong

AS-01Kahelipara Umtru-I

ME-03

S’Sujai Stage-IV Ckt-I

AS-09ME-07

12

Following main and back up meters are used for calculating Assam state drawal. Location ID of Assam meters is denoted as AS-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID AS-01 132 KV Kahelipara Umtru Feeder-I ME-03 AS-02 132 KV Kahelipara of Umtru Feeder-II ME-04 AS-03 220 KV Mariani Kathalguri KT-01 AS-04 220 KV Mariani Misa AS-37 AS-05 132 KV Mariani Dimapur NG-08 AS-06 132 KV Badarpur Lumshong ME-01 AS-07 132 KV Badarpur (ASEB) Badarpur (PG) AS-22 AS-08 132 KV Dullavcherra Dharmanagar TR-06 AS-09 132 KV Sarusujai Stage-IV feeder-I ME-07 AS-10 132 KV Pailapool Jiribam MN-06 AS-11 132 KV Haflong Consumption (ZZ-07)-(MN-08) AS-12 132 KV Bokajan Dimapur NG-03 AS-13 132 KV Gohpur Nirjuli AG-04 AS-14 132 KV Umrangsoo Consumption (KK-10)-(KK-09) AS-15 220 KV BTPS Salakati-II AS-31 AS-16 220 KV BTPS Salakati-I AS-30 AS-17 220 KV Samaguri Misa-I AS-38 AS-18 220 KV Samaguri Misa-II AS-39 AS-19 220 KV Samaguri Balipara-I AS-42 AS-20 Samaguri Balipara-II AS-43 AS-46 33 KV Gorgaon Naginimora Feeder * AS-47 33 KV Mariani Chanki Feeder * AS-48 33 KV Rupai Namsai Feeder * AS-49 33 KV Lekhapani Jairampur Feeder * AS-50 132 KV Sarusujai Stage-IV feeder-II ME-05 AS-52 132 KV Mariani Mokokchang NG-12 KK-20 33 KV Damsite feeder (NEEPCO) # KT-15 220 KV Tinsukia Kathalguri AS-53

* No back up for SEMs at 33 KV feeders, average reading of previous period taken in

case of non-availbility of meter reading. # Back up for this feeder is determined from the operational configuration at the 33 KV

level.

For Net Drawal of Assam, two fictitious meters AS-51 & AS-61 are used. Assam Drawal = (AS-51) + (AS-61) (AS-51) = - (AS-01) - (AS-02) - (AS-03) - (AS-04) - (AS-05) - (AS-06) - (AS-07)

- (AS-08) - (AS-09) - (AS-10) + (AS-11) - (AS-12) - (AS-13) +(AS-14) - (AS-15) - (AS-16) - (AS-17) - (AS-18) + (AS-42) - (AS-52)

(AS-61) = - (AS-46)*1.0309 - (AS-47)*1.0309 - (AS-48)*1.0309 - (AS-49)*1.0309

+ (KK-20) + (KT-15) - (AS-50)

In case of 33 KV feeders a factor of 1.0309 is used at the sending end (ASEB) presuming 4% loss is being incurred by ASEB for wheeling of power through these feeders (As mutually agreed).

13

Manipur interconnection with Grid

Bokajan

Following main and back up meters are used for calculating Manipur state drawal. Location ID of Manipur meters is denoted as MN-XX (where XX is ID no. of meters).


MN-01 132 KV Yurembam Imphal (PG) MN-05 MN-02 132 KV Ningthoukhong Loktak LO-04 MN-03 132 KV Karong Kohima NG-02 MN-04 Jiribam Consumption * * Using net bus of Jiribam substation.

For Net Drawal of Manipur, one fictitious meter MN-51 is used. MN-51 = - (MN-01) + (LO-04) - (MN-03) + (MN-04)

MEGHALAYA interconnection with Grid

Bokajan

MEGHA L AYA

CTU

A S S A M

Umtru-II Kahelipara

AS-02 ME-04

AS-06 ME-01

Badarpur Lumshong

Main Meter

132KV Line Back Up Meter

S’Sujai Stage-IV

ME-05AS-50

Ckt-II

KHLT(MeSEB)

ME-02

ME-06

KHLT(PG)Ckt-I

KHLT(MeSEB)

ME-08

ME-09

KHLT(PG)Ckt-II

MANIPUR

C E N T R A L

S E C T O R

NAGALAND

Karong

Kohima MN-03Y’bam Imphal

MN-01 MN-05

N’Kong Loktak

LO-04MN-02

Jiribam Consumption

MN-04

Main Meter


NG-02

LEGEND

LEGEND

Kahelipara Umtru-I

AS-01 ME-03

S’Sujai Stage-IV Ckt-I

AS-09 ME-07

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Following main and back up meters are used for calculating Meghalaya state drawal. Location ID of Meghalaya meters is denoted as ME-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID ME-01 132 KV Lumshong Badarpur AS-06 ME-02 132 KV Khleriat(MeSEB) Khleriat (PG)-I ME-06 ME-03 132 KV Umtru Kahelipara Feeder-I AS-01 ME-04 132 KV Umtru Kahelipara Feeder-II AS-02 ME-08 132 KV Khleriat(MeSEB) Khleriat (PG)-II ME-09 ME-07 132 KV Stage-IV Sarusujai Feeder-I AS-09 ME-05 132 KV Stage-IV Sarusujai Feeder-II AS-50

For Net Drawal of Meghalaya, one fictitious meter ME-51 is used.

(ME-51) = - (ME-01) - (ME-02) - (ME-03) - (ME-04) - (ME-05) - (ME-07) - (ME-08)

Mizoram interconnection with Grid

Following main and back up meters are used for calculating Mizoram state

drawal. Location ID of Mizoram meters is denoted as MZ-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID MZ-01 132 KV Aizawl (PG) Zemabawk Feeder * MZ-03 132 KV Bairabi Kolasib Feeder ** MZ-07 132 KV Kolasib Bawktlang Feeder **

* Using net bus of Aizawl(PG) substation ** Cumulative Flow in these two feeders can be computed from AS-23 (Badarpur(PG) end of Kolasib) and MZ-08 (Aizawl(PG) end of Kolasib)

For Net Drawal of of Mizoram, one fictitious meter MZ-51 is used. MZ-51 = + (MZ-01) + (MZ-03) + (MZ-07)

M IZORAM

C E N T R A L

S E C T O R


132KV Line

Aizawl(PG) Zemabawk

MZ-01

Generator

MZ-03

Bairabi

Bawktlang Kolasib

Badarpur(PG)

AS-23

Aizawl (PG)

MZ-08

MZ-07

15

Nagaland interconnection with Grid

Bokajan

LEGEND

Following main and back up meters are used for calculating Nagaland state

drawal. Location ID of Nagaland meters is denoted as NG-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID NG-02 132 KV Kohima Karong MN-03

NG-03 132 KV Dimapur Bokajan AS-12 NG-05 132 KV M’Chang Doyang DY-04 NG-11 132 KV Dimapur (State) Dimapur(PG) NG-01

NG-12 132 KV M’Chang Mariani AS-52 AS-46 33 KV Naginimora Gorgaon * AS-47 33 KV Chanki Mariani *

* Joint meter readings are considered in case of non-availability of main meter readings pertaining to LT feeders. For Net Drawal of Nagaland, one fictitious meter NG-51 is used. NG-51= - (NG-11) - (NG-03) + (NG-02) + (NG-12) + (NG-05) + (AS-46) + (AS-47)

NAGALAND

C E N T R A L

S E C T O R

DoyangM’Chang

DY-04NG-05

Dimapur Bokajan

NG-03 AS-12

D’pur(Nag) D’Pur(PG)

NG- 01NG-11 A S S A M

N’moraG’gaon

AS-46

Bokajan

AS-12 NG-03

Dimapur

Mariani

Chanki AS-47

Mariani

AS-52 NG-12

M’Chang Man i pu r

Kohima Karong

NG-02 MN-03

Main Meter


16

Tripura interconnection with Grid

Bokajan

Following main and back up meters are used for calculating Tripura state drawal. Location ID of Tripura meters is denoted as TR-XX (where XX is ID no. of meters).

MAIN METERS BACK UP METERS LOC ID Feeder Name LOC ID TR-01 132 KV Agartala AGTPP Feeder-I AG-01 TR-02 132 KV Agartala AGTPP Feeder-II AG-02 TR-03 132 KV P K Bari Kumarghat TR-04 TR-05 Kumarghat Comsumption * TR-06 132 KV Dharmanagar Dullavcherra AS-08

* Using net bus of Kumarghat(PG) substation. For Net drawal of Tripura, one fictitious meter TR-51 is used. (TR-51) = - (TR-06) - (TR-01) - (TR-02) - (TR-03) + (TR-05)

ER - NER interconnection

LEGEND

N

E

R

E R

Binaguri Bongaigaon Ckt-I

AS-25 ER-01 Binaguri Bongaigaon Ckt-II

ER-02 AS-26 Birpara Salakati Ckt-I

ER-03 AS-33 Birpara Salakati Ckt-II

ER-04 AS-34 Gelephu Salakati

ER-05 AS-32


132KV Line

400 KV Line 220KV Line

TRIPURA

C E N T R A L

S E C T O R

PK Bari Kumarghat

TR-04TR-03

A

S

S

A

M

D’Nagar D’Cherra

TR-06AS-08 Agartala AGTPP

TR-01 AG-01Ckt-I

Agartala AGTPP

TR-02 AG-02Ckt-II

LEGEND

Main Meter

132KV Line TR-05

Kumarghat ICT

17

Following main and back up meters are used for calculating Eastern Regional drawal. Location ID of Eastern Region meters is denoted as ER-XX (where XX is ID no. of meters).


AS-25 400KV Bongaigaon Binaguri Feeder-I ER-01 AS-26 400KV Bongaigaon Binaguri Feeder-II ER-02 AS-32 132KV Salakati Gelephu Feeder ER-05 AS-33 220KV Salakati Birpara Feeder-I ER-03

AS-34 220KV Salakati Birpara Feeder-II ER-04

For Net Drawal of Eastern Region, one fictitious meter ER-51 is used.

ER-51 = - (AS-33) - (AS-34) - (AS-32) - (AS-25) - (AS-26)

DOYANG Interconnection with Grid

LEGEND

Following main and back up meters are used for calculating Doyang injection.

Location ID of Doyang meters is denoted as DY-XX (where XX is ID no. of meters).


DY-01 132 KV Doyang Dimapur Feeder-I ZZ-13 DY-02 132 KV Doyang Dimapur Feeder-II ZZ-14 DY-03 132 KV Doyang Kohima Feeder (Future) NG-04 DY-04 132 KV Doyang Mokokchang NG-05

For Net injection of Doyang, one fictitious meter DY-71 is used. DY-71 = +(DY-01) +(DY-02) +(DY-03) +(DY-04)

N A G A L A N D

D O Y A N G

Doyang Kohima

DY-03 NG-04


132KV Line

Future Line

C

T

U

Doyang Dimapur

DY-01 ZZ-13

Ckt-I

Doyang Dimapur

DY-02 ZZ-14

Ckt-II

Doyang M’Chang

DY-04 NG-05

18

KHANDONG & KOPILI-II Interconnection with Grid

LEGEND

Following main and back up meters are used for calculating Khandong and

Kopili-II injection. Location ID of Khandong and Kopili-II meters is denoted as KD-XX (where XX is ID no. of meters).


KK-01 132 KV Khandong Haflong Feeder ZZ-07 KK-02 132 KV Khandong Khlieriat Feeder-I ZZ-15 KK-03 132 KV Khandong Khlieriat Feeder-II ZZ-16 KK-04 220/132 KV Khandong Kopili KK-08 KK-20 33 KV Damsite NEEPCO AS-14 Umrangsoo Consumption KK-19 Kopili Stage-II Station Transformer KK-17 Kopili Stage-II GT-2

For Net injection of Khandong, one fictitious meter KD-71 is used.

KD-71 = +(KK-01)+ (KK-02) + (KK-03) + (KK-04) + (KK-20) + (AS-14) - (KK-17) +(KK-19) Net injection of Kopili-II is the summation of (KK-17) & (KK-19). Kopili-II injection = + (KK-17) - (KK-19)

C

T

U

K H A N D O N G

&

K O P I L I

-II

Khandong Khlieriat

KK-02 ZZ-15

Ckt-I

Khandong Haflong

KK-01 ZZ-07

K O P I L I

Khandong Khlieriat

KK-03 ZZ-16

Ckt-II

Khandong Kopili

KK-04 KK-08

A S S A M

Kopili-II GT

Back Up Meter

220KV Line

Main Meter


K’dong GT

Dam site Feeder(NEEPCO)

Umrangsoo AS-14

KK-17

KK-11

KK-12 KK-10

KK-18

KK-19

KK-20

Kopili-II Stn. TRF.

K’dong AUX KK-09

19

KOPILI Interconnection with Grid

LEGEND

Following main and back up meters are used for calculating Kopili injection.

Location ID of Kopili meters is denoted as KK-XX (where XX is ID no. of meters).


KK-05 220 KV Kopili Misa Feeder-I ZZ-10 KK-06 220 KV Kopili Misa Feeder-II ZZ-11 KK-07 220 KV Kopili Misa Feeder-III ZZ-12 KK-08 220/132 KV Kopili Khandong KK-04

For Net injection of Kopili, one fictitious meter KP-71 is used. KP-71 = + (KK-05) + (KK-06) + (KK-07) + (KK-08)

KATHALGURI Interconnection with Grid

LEGEND

A S S A M

K A T H A L G U R I

Main Meter

220 KV LineBack Up Meter

CTU

Kathalguri Tinsukia

KT-15 AS-53

Kathalguri Deomali

KT-14 AR-07

Kathalguri Mariani

KT-01 AS-03

Kathalguri Misa

KT-02 ZZ-09

A

P

K

O

P

I

L

I

220 KV Line

Back Up Meter

132 KV Line

Main Meter

C

T

U

Kopili Misa

KK-06 ZZ-11

Ckt-II

Kopili Khandong

KK-08 KK-04

K’

D O N G

Kopili Misa

KK-05 ZZ-10

Ckt-I

Kopili Misa

KK-07 ZZ-12

Ckt-III

20

Following main and back up meters are used for calculating Kathalguri injection. Location ID of Kathalguri meters is denoted as KT-XX (where XX is ID no. of meters).


KT-01 220 KV Kathalguri Mariani Feeder AS-03 KT-02 220 KV Kathalguri Misa Feeder ZZ-09 KT-14 220 KV Kathalguri Deomali Feeder AR-07 KT-15 220 KV Kathalguri Tinsukia Feeder AS-53

For Net injection of Kathalguri, one fictitious meter KT-71 is used. KT-71 = + (KT-01) + (KT-02) + (KT-14) + (KT-15)

LOKTAK Interconnection with Grid

LEGEND

Following main and back up meters are used for calculating Loktak injection.

Location ID of Loktak meters is denoted as LO-XX (where XX is ID no. of meters).


LO-01 132 KV Loktak Jiribam Feeder-I ZZ-05 LO-02 132 KV Loktak Jiribam Feeder-II ZZ-06 LO-03 132 KV Loktak Imphal Feeder ZZ-19 LO-04 132 KV Loktak Ningthoukhong MN-02

For Net injection of Loktak, one fictitious meter LO-71 is used. LO-71 = + (LO-01) + (LO-02) + (LO-03) + (LO-04)

L

O

K

T

A

K

Faulty Line

Back Up Meter

132 KV Line

Main Meter

C

T

U Loktak Jiribam

LO-01 ZZ-05

Ckt-I

M A N I P U R

Loktak Imphal

LO-03 ZZ-19

Loktak N’Kong

LO-04 MN-02

Loktak Jiribam

LO-02 ZZ-06

Ckt-II

21

R C NAGAR Interconnection with Grid

LEGEND

Following main and back up meters are used for calculating R C Nagar injection.

Location ID of R C Nagar meters is denoted as AG-XX (where XX is ID no. of meters).


AG-01 132 KV R C Nagar Agartala Feeder-I TR-01 AG-02 132 KV R C Nagar Agartala Feeder-II TR-02 AG-03 132 KV R C Nagar Kumarghat Feeder TR-11

For Net injection of RC Nagar, one fictitious meter AG-71 is used. AG-71 = + (AG-01) + (AG-02) + (AG-03)

RANGANADI Interconnection with Grid

LEGEND

A

P

R

A

N

G

A

N

A

D

I

Ranganadi Nirjuli

RN-01 AR-03

Back Up Meter

132KV Line

Main Meter

400 KV Line

C

T

U

Ranganadi Balipara

RN-02 AS-44

Ckt-I

Ranganadi Balipara

RN-03 AS-45

Ckt-II

Ranganadi Ziro

RN-11 AR-06

C T U

R C

N A G A R

Main Meter

132KV LineBack Up Meter

T R I P U R A

RC Nagar Agartala

AG-01 TR-01

Ckt-I

RC Nagar Agartala

AG-02 TR-02

Ckt-II

RC Nagar Kumarghat

AG-03 TR-11

Naharlagun AR-05

22

Following main and back up meters are used for calculating Ranganadi injection.

Location ID of Ranganadi meters is denoted as RN-XX (where XX is ID no. of meters).


RN-01 132 KV Ranganadi Nirjuli Feeder AR-03 + AR-05 RN-02 400 KV Ranganadi Balipara Feeder-I AS-44

RN-03 400 KV Ranganadi Balipara Feeder-II AS-45 RN-11 132 KV Ranganadi Ziro Feeder AR-06 For Net injection of Ranganadi, one fictitious meter RN-71 is used. RN-71 = + (RN-01) + (RN-02) + (RN-03) + (RN-11) 2.6 Master Database of SEMs in NER

Location ID

Meter No. C.T. Ratio P.T. Ratio Place of installation of SEM

AS-01 NP-0360-A 0400 1200.0000 KAHELIPARA END OF UMTRU-1 FDR AS-02 NP-0319-A 0400 1200.0000 KAHELIPARA END OF UMTRU-2 FDR AS-03 NP-0357-A 0800 2000.0000 MARIANI END OF KATHALGURI FDR AS-04 NP-0379-A 0800 2000.0000 MARIANI END OF MISA FDR AS-05 NP-0822-A 0400 1200.0000 MARIANI END OF DIMAPUR FDR AS-06 NP-0309-A 0400 1200.0000 BADARPUR END OF LUMSHONG FDR AS-07 NP-0866-A 0600 1200.0000 BADARPUR(ASEB)END OF BDP(PG)FDR AS-08 NP-0863-A 0200 1200.0000 DULLAVCHERRA END OF D'NGAR FDR AS-09 NP-0846-A 0400 1200.0000 S'SAJAI END OF 132kV STG-4 FDR-1 AS-10 NP-0368-A 0400 1200.0000 PAILAPOOL END OF JIRIBAM FDR AS-11 NP-0301-A 0050 1200.0000 HAFLONG CONSUMPTION AS-12 NP-2503-A 0300 0600.0000 BOKAJAN END OF DIMAPUR FEEDER AS-13 NP-6034-A 0400 1200.0000 GOHPUR END OF 132KV NIRJULI FDR AS-14 NP-5781-A 0200 0300.0000 UMRANGSOO CONSUMPTION AS-15 NP-0347-A 0800 2000.0000 BTPS END OF SALAKATI FDR-2 AS-16 NP-0850-A 0800 2000.0000 BTPS END OF SALAKATI FDR-1 AS-17 NP-5797-A 0800 2000.0000 SAMAGURI END OF MISA-1 FDR AS-18 NP-5796-A 0500 2000.0000 SAMAGURI END OF MISA-2 FDR AS-19 NP-5795-A 0400 2000.0000 SAMAGURI END OF BALIPARA-1 FDR AS-20 FUTURE SAMAGURI END OF BALIPARA-2 FDR AS-21 NP-0000-A 0300 1200.0000 BDP(PG)END OF JIRIBAM FEEDER AS-22 NP-0847-A 0600 1200.0000 BDP(PG) END OF BDP(ASEB) FEEDER AS-23 NP-0294-A 0600 1200.0000 BDP(PG) END OF KOLASIB FDR AS-24 NP-0862-A 0300 1200.0000 BADARPUR(PG)END OF KHLRT FEEDER AS-25 NP-5313-A 1000 3636.3636 BONG END OF BINAGURI-1 FEEDER AS-26 NP-5318-A 1000 3636.3636 BONG END OF BINAGURI-2 FEEDER AS-27 NP-5312-A 1000 3636.3636 BONG 400/220kV ICT(HV SIDE) AS-28 NP-5311-A 1000 3636.3636 BONG END OF BLP-1 FEEDER AS-29 NP-5316-A 1000 3636.3636 BONG END OF BLP-2 FEEDER AS-30 NP-5314-A 0800 2000.0000 SALAKATI END OF BTPS-1 FDR AS-31 NP-5315-A 0800 2000.0000 SALAKATI END OF BTPS-2 FDR AS-32 NP-5305-A 0300 1200.0000 SALAKATI END OF BHUTAN FEEDER AS-33 NP-5304-A 0800 2000.0000 SALAKATI END OF BIRPARA-1 FDR AS-34 NP-5303-A 0800 2000.0000 SALAKATI END OF BIRPARA-2 FDR AS-35 NP-5299-A 1000 3636.3636 MISA END OF BALIPARA-1 FDR AS-36 NP-5291-A 1000 3636.3636 MISA END OF BALIPARA-2 FDR AS-37 NP-5298-A 0800 2000.0000 MISA END OF MARIANI FDR AS-38 NP-5294-A 0500 2000.0000 MISA END OF SMG-1 FDR AS-39 NP-5290-A 0500 2000.0000 MISA END OF SMG-2 FDR AS-40 NP-5296-A 1200 2000.0000 MISA 400/220KV ICT(LV SIDE) AS-41 NP-5309-A 1000 3636.3636 BALIPARA 400/220KV ICT

23

Location ID


AS-42 NP-5307-A 0800 2000.0000 BALIPARA END OF SAMAGURI FDR-1 AS-43 FUTURE BALIPARA END OF SAMAGURI FDR-2 AS-44 NP-5310-A 1000 3636.3636 BALIPARA END OF RANGANADI FDR-1 AS-45 NP-5308-A 1000 3636.3636 BALIPARA END OF RANGANADI FDR-2 AS-46 NP-4139-A 0200 0300.0000 GORGAON END OF 33KV NAGINIMORA AS-47 NP-0306-B 0040 0300.0000 MARIANI END OF 33KV CHANKI FDR AS-48 NP-0335-A 0100 0300.0000 RUPAI END OF 33KV NAMSAI FDR AS-49 NP-0639-B 0010 0300.0000 LEKHAPANI END OF 33KV JAIRAMPUR AS-50 NP-0843-A 0400 1200.0000 S'SAJAI END OF 132kV STG-4 FDR-2 AS-52 NP-0358-A 0400 1200.0000 MARIANI END OF 132KV M’CHANG FDR AS-53 NP-0855-A 0400 2000.0000 TINSUKIA END OF 220KV KTG FDR AS-54 NP-5283-A 0800 2000.0000 BALIPARA-KHUPI 220/132KV(HV) ICT AS-55 NP-5306-A 0300 1200.0000 BALIPARA END OF 132kV KHUPI FDR MN-01 NP-0299-A 0400 1200.0000 YUREMBAM END OF IMPH PG FDR MN-02 NP-0356-A 0400 1200.0000 NINTHOUKHONG END OF LOKTAK FDR MN-03 NP-0334-A 0400 1200.0000 KARONG END OF KOHIMA FDR MN-04 NP-0311-A 0050 1200.0000 JIRIBAM (132/33KV TRF)CONSUMPTION MN-05 NP-0806-A 0300 1200.0000 IMPHAL PG END OF YUREMBAM FDR MN-06 NP-0287-A 0400 1200.0000 JIRIBAM END OF PLP FDR MN-07 NP-0000-A 0400 1200.0000 JIRIBAM END OF AIZAWL FDR MN-08 NP-0288-A 0400 1200.0000 JIRIBAM END OF HAFLONG FDR ZZ-01 NP-0338-A 0400 1200.0000 YUREMBAM END OF N’KHONG FDR ZZ-02 NP-0344-A 0400 1200.0000 YUREMBAM END OF KARONG FDR ZZ-05 NP-0000-A 0300 1200.0000 JIRIBAM END OF LOKTAK-1 FDR ZZ-06 NP-0284-A 0300 1200.0000 JIRIBAM END OF LOKTAK-2 FDR ZZ-07 NP-0303-A 0400 1200.0000 HAFLONG END OF KHD FDR ZZ-09 NP-6157-A 0800 2000.0000 MISA END OF KATHALGURI FDR ZZ-10 NP-5293-A 0500 2000.0000 MISA END OF KOPILI-1 FDR ZZ-11 NP-5292-A 0800 2000.0000 MISA END OF KOPILI-2 FDR ZZ-12 NP-5295-A 0800 2000.0000 MISA END OF KOPILI-3 FDR ZZ-13 NP-5319-A 0300 1200.0000 DIMAPUR END OF DOYANG-1 FDR ZZ-14 NP-5284-A 0300 1200.0000 DIMAPUR END OF DOYANG-2 FDR ZZ-15 NP-0802-A 0300 1200.0000 KHLRT END OF KHANDONG-1 FDR ZZ-16 NP-0803-A 0600 1200.0000 KHLRT END OF KHANDONG-2 FDR ZZ-17 NP-5280-A 1000 3636.3636 BALIPARA END OF BONG-1 FDR ZZ-18 NP-5281-A 1000 3636.3636 BALIPARA END OF BONG-2 FDR ZZ-19 NP-0346-A 0300 1200.0000 IMPHAL PG END OF LOKTAK FDR ZZ-20 NP-5301-A 0500 2000.0000 MISA END OF DIM-1 FDR ZZ-21 NP-5302-A 0500 2000.0000 MISA END OF DIM-2 FDR ZZ-22 NP-5300-A 1000 3636.3636 MISA 400/220KV ICT(HV SIDE) ZZ-23 NP-5289-A 0300 2000.0000 DIMAPUR(HV SIDE) 220/132kV ICT ZZ-24 NP-5282-A 1200 2000.0000 BALIPARA 400/220KV(LV) ICT ZZ-25 NP-5790-A 1000 3636.3636 BALIPARA END OF MISA FDR-1 ZZ-26 NP-5285-A 1000 3636.3636 BALIPARA END OF MISA FDR-2 ZZ-27 NP-5317-A 1200 2000.0000 BONG 400/220KV(LV) ICT ER-01 NP-5884-A 1000 3636.3636 BINAGURI END OF BONG FDR-1 ER-02 NP-5885-A 1000 3636.3636 BINAGURI END OF BONG FDR-2 ER-03 NP-4144-A 0800 2000.0000 BIRPARA END OF SALAKATI-1 ER-04 NP-2358-A 0800 2000.0000 BIRPARA END OF SALAKATI-2 ER-05 NP-0364-A 0300 1200.0000 GELEPHU END OF SALAKATI FDR ER-06 NP-0550-A 0500 3636.3636 DURGAPUR FREQ BACKUP METER-1 ER-07 NP-0518-A 0500 3636.3636 DURGAPUR FREQ BACKUP METER-2 WR-01 NP-2465-A 1000 3636.3636 KORBA END OF KORBA-VINDYACHAL ME-01 NP-0821-A 0400 1200.0000 LUMSHNONG END OF BADARPUR FDR ME-02 NP-0322-A 0300 1200.0000 KHLT(MeSEB) END OF KHLT(PG) FDR-1 ME-03 NP-0312-A 0400 1200.0000 UMTRU END OF KAHELIPARA-1 ME-04 NP-0371-A 0400 1200.0000 UMTRU END OF KAHELIPARA-2 ME-05 NP-0842-A 0400 1200.0000 STAGE-IV END OF S'SUJAI FDR-2 ME-06 NP-0804-A 0300 1200.0000 KHLT(PG) END OF KHLT(MeSEB) FDR-1 ME-07 NP-0807-A 0400 1200.0000 STAGE-IV END OF S'SUJAI FDR-1 ME-08 NP-0819-A 0400 1200.0000 KHLT(MeSEB) END OF KHLT(PG) FDR-2 ME-09 NP-2506-A 0300 1200.0000 KHLT(PG) END OF KHLT(MeSEB) FDR-2

24

Location ID


MZ-01 NP-0867-A 0300 1200.0000 AIZAWL END OF ZEMABAWK FDR MZ-02 NP-0000-A 0060 0600.0000 VAIRENGTE END OF D’CHERRA FDR MZ-03 NP-2505-A 0150 1200.0000 BAIRABI END OF 132kV KOLASIB FDR MZ-04 NP-2501-A 0075 1200.0000 HV SIDE OF 11/132kV TRF-1 MZ-05 NP-4134-A 0075 1200.0000 HV SIDE OF 11/132kV TRF-2 MZ-06 NP-4133-A 0025 1200.0000 HV SIDE OF 132/11kV TRF(BAIRABI) MZ-07 NP-0445-A 0075 0600.0000 BWK END OF 132/66KV KOLASIB FDR MZ-08 NP-0323-A 0600 1200.0000 AIZAWL(PG) END OF KOLASIB FDR MZ-09 NP-0293-A 0300 1200.0000 AIZAWL(PG) END OF KUMARGHAT FDR MZ-10 NP-0286-A 0400 1200.0000 AIZAWL(PG) END OF JIRIBAM FDR NG-01 NP-5288-A 0300 1200.0000 DIMAPUR(PG) END OF D’PUR(NAG) FDR NG-02 NP-0327-A 0250 1200.0000 KOHIMA END OF KARONG FDR NG-03 NP-0337-A 0100 0600.0000 DIMAPUR END OF BOKAJAN FDR NG-04 FUTURE KOHIMA END OF DOYANG FDR NG-05 NP-4208-A 0100 1200.0000 MOKOKCHUNG END OF DOYANG FDR NG-06 NP-5320-A 0250 2000.0000 DIMAPUR END OF MISA-1 FDR NG-07 NP-5321-A 0250 2000.0000 DIMAPUR END OF MISA-2 FDR NG-08 NP-5287-A 0300 1200.0000 DIMAPUR END OF 132kV MARIANI FDR NG-09 NP-5323-A 0600 1200.0000 DIMAPUR(LV SIDE) 220/132kV ICT NG-10 NP-5322-A 0300 1200.0000 DIMAPUR END OF IMPHAL FEEDER NG-11 NP-0348-A 0400 1200.0000 DIMAPUR(S)END OF DIMAPUR(PG) FDR NG-12 NP-0298-A 0100 1200.0000 M’CHUNG END OF 132kV MARIANI FDR TR-01 NP-0302-A 0400 1200.0000 AGARTALA END OF AGTPP-1 FDR TR-02 NP-0825-A 0400 1200.0000 AGARTALA END OF AGTPP-2 FDR TR-03 NP-0869-A 0400 1200.0000 P.K.BARI END OF K'GHAT(PG) FDR TR-04 NP-0291-A 0300 1200.0000 K'GHAT(PG) END OF P.K.BARI FDR TR-05 NP-0369-A 0025 1200.0000 K'GHAT 5MVA ICT TR-06 NP-0652-B 0040 1200.0000 DHARMANAGAR END OF DULLAV FDR TR-07 NP-4137-A 0075 1200.0000 ROKHIA GT-5 TR-08 NP-4136-A 0075 1200.0000 ROKHIA GT-6 TR-09 NP-0000-A 0300 1200.0000 K'GHAT END OF AZL FEEDER TR-10 NP-0826-A 0400 1200.0000 K'GHAT (PG)END OF BDR FEEDER TR-11 NP-0280-A 0600 1200.0000 K'GHAT END OF AGTPP FDR TR-12 NP-4138-A 0300 0600.0000 BARAMURA GT-4 KK-01 NP-5780-A 0300 1200.0000 KHANDONG END OF HAFLONG FDR KK-02 NP-5809-A 0300 1200.0000 KHANDONG END OF KHLRT FDR-1 KK-03 NP-5774-A 0600 1200.0000 KHANDONG END OF KHLRT FDR-2 KK-04 NP-5773-A 0300 1200.0000 KHANDONG END OF KOPILI FDR KK-05 NP-5811-A 0500 2000.0000 KOPILI END OF MISA-1 FDR KK-06 NP-5812-A 0500 2000.0000 KOPILI END OF MISA-2 FDR KK-07 NP-5799-A 0500 2000.0000 KOPILI END OF 220KV MISA-3 FDR KK-08 NP-5801-A 0300 1200.0000 KOPILI 220/132KV ICT KK-09 NP-5783-A 0025 0300.0000 KHANDONG 33KV STN TRF KK-10 NP-5775-A 0050 1200.0000 KHANDONG 132/33KV ICT KK-11 NP-5779-A 0150 1200.0000 KHANDONG GT-1 KK-12 NP-6153-A 0150 1200.0000 KHANDONG GT-2 KK-13 NP-5802-A 0200 2000.0000 KOPILI GT-1 KK-14 NP-5800-A 0200 2000.0000 KOPILI GT-2 KK-15 NP-5798-A 0200 2000.0000 KOPILI GT-3 KK-16 NP-5808-A 0200 2000.0000 KOPILI GT-4 KK-17 NP-5810-A 0200 1200.0000 KOPILI GT-2 OF STG-2 KK-18 NP-6155-A 0100 0300.0000 LV SIDE OF 132/33KV TRF KK-19 NP-5776-A 0025 0300.0000 KOPILI STG-2 33KV STN TRF KK-20 NP-6154-A 0200 0300.0000 33KV DAMSITE FDR(NEEPCO) KT-01 NP-5785-A 0800 2000.0000 KATHALGURI END OF MARIANI FDR KT-02 NP-5784-A 0800 2000.0000 KATHALGURI END OF MISA FDR KT-03 NP-5804-A 0150 2000.0000 KATHALGURI GT-1 KT-04 NP-5805-A 0150 2000.0000 KATHALGURI GT-2 KT-05 NP-5806-A 0150 2000.0000 KATHALGURI GT-3 KT-06 NP-5807-A 0150 2000.0000 KATHALGURI GT-4 KT-07 NP-5818-A 0150 2000.0000 KATHALGURI GT-5 KT-08 NP-5819-A 0150 2000.0000 KATHALGURI GT-6

25

Location ID


KT-09 NP-5820-A 0150 2000.0000 KATHALGURI GT-7 KT-10 NP-5822-A 0150 2000.0000 KATHALGURI GT-8 KT-11 NP-5823-A 0150 2000.0000 KATHALGURI GT-9 KT-12 NP-5789-A 0050 2000.0000 KATHALGURI STN TRF-1 KT-13 NP-5791-A 0050 2000.0000 KATHALGURI STN TRF-2 KT-14 NP-5787-A 0400 2000.0000 KTG END OF 220kV DEOMALI FDR KT-15 NP-5786-A 0800 2000.0000 KTG END OF 220kV TINSUKIA FDR AG-01 NP-0858-A 0300 1200.0000 AGTPP END OF AGARTALA-1 FDR AG-02 NP-0851-A 0300 1200.0000 AGTPP END OF AGARTALA-2 FDR AG-03 NP-0870-A 0600 1200.0000 AGTPP END OF K'GHAT FDR AG-04 NP-0859-A 0250 1200.0000 AGTPP GT-1 AG-05 NP-0827-A 0250 1200.0000 AGTPP GT-2 AG-06 NP-0830-A 0250 1200.0000 AGTPP GT-3 AG-07 NP-0829-A 0250 1200.0000 AGTPP GT-4 AG-08 NP-0857-A 0050 1200.0000 AGTPP STN TRF-1 AG-09 NP-0856-A 0050 1200.0000 AGTPP STN TRF-2 AR-01 NP-5825-A 0100 1200.0000 NIRJULI TRF INCOMER-1 AR-02 NP-5824-A 0100 1200.0000 NIRJULI TRF INCOMER-2 AR-03 NP-6031-A 0600 1200.0000 NRJ(PG) END OF 132kV RNG FDR AR-04 NP-5771-A 0300 1200.0000 NRJ(PG) END OF 132kV GOHPUR FDR AR-05 NP-5793-A 0300 1200.0000 NAHARLAGUN 132KV FDR AR-06 NP-4205-A 0150 1200.0000 ZIRO END OF 132KV RANGANADI FDR AR-07 NP-4206-A 0400 2000.0000 DEOMALI END OF 220KV K’GURI FDR DY-01 NP-5770-A 0300 1200.0000 DOYANG END OF 132KV D’PUR-1 FDR DY-02 NP-5794-A 0300 1200.0000 DOYANG END OF 132KV D’PUR-2 FDR DY-03 NP-5279-A 0300 1200.0000 DOYANG END OF 132KV KOHIMA FDR DY-04 NP-5772-A 0300 1200.0000 DOYANG END OF 132KV MOKOK FDR DY-05 NP-5826-A 0025 1200.0000 DOYANG STN TRF DY-06 NP-5768-A 0125 1200.0000 DOYANG GT-1 DY-07 NP-5803-A 0125 1200.0000 DOYANG GT-2 DY-08 NP-5827-A 0125 1200.0000 DOYANG GT-3 LO-01 NP-0289-A 0400 1200.0000 LOKTAK END OF JIRIBAM-1 FDR LO-02 NP-0329-A 0400 1200.0000 LOKTAK END OF JIRIBAM-2 FDR LO-03 NP-0330-A 0400 1200.0000 LOKTAK END OF IMPHAL PG FDR LO-04 NP-0331-A 0400 1200.0000 LOKTAK END OF N’KHONG FDR LO-05 NP-0283-A 2500 0100.0000 LOKTAK GT-3 LO-06 NP-0304-A 2500 0100.0000 LOKTAK GT-1 LO-07 NP-0307-A 2500 0100.0000 LOKTAK GT-2 LO-08 NP-0375-A 0050 1200.0000 LOKTAK STN TRF RN-01 NP-5792-A 0500 1200.0000 RANGANADI END OF NIRJULI FDR RN-02 NP-6033-A 1000 3636.3636 RANGANADI END OF 400KV BLP-1 RN-03 NP-5817-A 1000 3636.3636 RANGANADI END OF 400KV BLP-2 RN-04 NP-5277-A 1000 1200.0000 RANGANADI GT-1 RN-05 NP-5813-A 1000 1200.0000 RANGANADI GT-2 RN-06 NP-5814-A 1000 1200.0000 RANGANADI GT-3 RN-07 NP-5276-A 0250 1200.0000 RANGANADI STN.TFR-1 RN-08 NP-5815-A 0250 1200.0000 RANGANADI STN.TFR-2 RN-09 NP-5816-A 1000 1200.0000 RANGANADI 400/132KV AUTO TFR-1 RN-10 NP-5275-A 1000 1200.0000 RANGANADI 400/132KV AUTO TFR-2 RN-11 NP-5278-A 0500 1200.0000 RANGANADI END OF 132KV Zero FDR

***************

SECTION 3

DATA COLLECTION &

TRANSMITTAL TO RLDC

26

3.1 Data Collection from Meters

The figure below shows a typical arrangement for collecting data from Special Energy Meters (SEM) using Data Collecting Device (DCD). The DCD is connected to the SEM through two interconnected cables:

1. Data cable 2. Optical cable

3.1.1 Data Collection from SEM through DCD

DCD (Data Collecting Device) is used for collection of data from Special

Energy Meters. Optical port of meter is the interface between SEM and DCD for data tapping from meter memory. Optical cord is used for coupling DCD to the optical port of SEM which is circular for L&T meters and rectangular in case of Secure make SEMs. Suitable software is provided with DCD to enable data collection from SEMs and dumping the same to PC.

Optical port of SEM and DCD with connecting cords is shown in figure below.

Optical Port in SEM DCD with connecting cords

Special Energy Meter

Optical Cable

Data Cable

Data Collecting Device (DCD)

27

There are two models of DCD:

1. The model with only numeric keys and control keys (17 keys) known

as POS296 model (PSION) – This model is already outdated and is not being discussed.

2. The model with full alphanumeric keys and control keys (45 keys)

known as XP model (Analogic). All DCD related procedures discussed in this manual pertains to analogic DCD.

For downloading data from SEM to DCD and subsequently dumping the

same from DCD to PC following procedure is carried out: 3.1.1.1 Data tapping from Meter to DCD

Step 1: Connect the AC to DC Adapter (9 Volt) to DCD / MRI (Meter Reading Instrument)

Step 2: Connect the Data cable with DCD/MRI

Data cables are of two types:

1. D-Type Cable:

Having 9-pin connectors at both ends. (The round shaped male end being connected to DCD).

2. RJ-11 Cable: Having 9-pin female connector at one end and RJ-11 (Telephone jack) at other end (connected to DCD).

Step 3: Connect 9-pin female connector of the data cable with 9-pin male

connector of the optical cord.

Step 4: Place the other end of Optical cord to the optical sensor/port of the SEM.

Step 5: DCD is switched ON by Pressing “POWER RESUME” key for few seconds.

Step 6: DCD will be powered up & following menu will appear in the DCD

screen

Step 7: Press “D” for collecting data from SEM. DCD will display the following message

• While making connection with DCD

Wait

D : Collect Selected Data U : PC Communication P : Programming Mode O : Memory Status Check R : Accuracy Test

28

• While collecting data

• After successful completion of data collection

Step 8: To come back to main menu of DCD, press “Enter”.

Step 9: Decouple the optical cord from the SEM optical port and disconnect

optical cord from the data cable. Then DCD will be with data cable only for dumping of data from DCD to PC.

3.1.1.2 Data dumping from DCD to PC by “Vincom” software for L&T meters:

Step 1: To connect DCD with local PC, plug in 9-pin female connector of the data cable to 9-pin serial port of the local PC.

Step 2: The operations should be started from Computer.

Step 3: Open “Vincom” with appropriate login ID and password.

Step 4: Select “Collect Data” option in “MRI” and following screen will appear.

Data Collected ***** Bytes Received

Press Enter

Receiving …… Preselected data

***** Bytes

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Step 5: Click on “Collect Data” option and following window will appear.

Step 6: Press “U” key in DCD for PC communication and following screen will appear in DCD display.

• While communicating PC with DCD

Step 7: Enter Collector Name and click on “Collect” button. Following screen will appear in “Vincom” software.

Waiting for Data Request

30

The data file will be saved in a sub-folder named “Data” in “Vincom” folder of the particular directory where the software (Vincom) is installed. Data will be saved in a file with the following naming format:

yyyyMMddhhmmss.dat

where, yyyy = Year, MM = Month, dd = Date, hh = Hour,

mm = Minutes and ss = seconds

For Example, if data is downloaded on 04/06/08 at 15:30:15Hrs, it will be stored as 20080604153015.dat Note: Automatic naming of data file while downloading without asking for user defined file name is creating operational/processing problems. Matter is being taken up with L&T for rectification.

While downloading data from DCD to PC following screen will appear in DCD display

Step 8: After completion of Dumping, DCD will display

and “Vincom” will show the following screen:

Step 9: Press “Enter” key in DCD to go to the main menu and click on “OK” button in “Vincom”

Data Dumped ***** Bytes

Clearing DCD

31

Step 10: Click on Close button to exit from “Vincom” and click on “Yes” option at the confirmation prompt.

Step 11: To switch off the DCD press “POWER RESUME” key for few seconds until the barline on the DCD screen is completely erased. Otherwise, DCD goes to safe mode and battery is also drained progressively.

3.1.1.3 Data dumping from DCD to PC by “Smartgrid” software for SML meters

Step 1: To connect DCD with local PC, plug in 9-pin female connector of the data cable to 9-pin serial port of the local PC.

Step 2: The operations should be started from Computer.

Step 3: Open “Smartgrid” with appropriate login id and password.

Step 4: Select “MRI Communication” option in “MRI” and following screen

will appear

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Step 5: Click on “MRI Communication” option in “Smartgrid” and following window will appear on the screen.

Step 6: Press “U” key in DCD for PC communication and following screen will

appear in DCD display:

• While communicating PC with DCD

Step 7: Click on “Read MRI” option and following window will appear on the

screen:

Waiting for Data Request

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Now click on “Yes” option for data dumping. The data file will be saved in a sub-folder named “Data” in “Smartgrid” folder of

the particular directory where the software (Smartgrid) is installed. Data will be saved in a file with the following naming format:

ddmmyyno.MRI

where, dd = Date, mm = month, yy = Year and

no = Two digit numeric code. For example, the first and third readings dumped to PC on 01/05/08 will be stored as 01050801.MRI and 01050803.MRI respectively. Note: Automatic naming of data file while downloading without asking for user defined file name is creating operational/processing problems. Earlier, in case of PSION type DCD, there used to be a prompt asking for user defined file name.

While downloading data from DCD to PC following screen will appear in DCD

display

Step 8: After completion of Dumping, DCD will display

Step 9: Press “Enter” key in DCD to go the main menu.

Step 10: Click on Close button to exit from “Smartgrid”.

Step 11: To switch off the DCD press “POWER RESUME” key for few seconds until the barline on the DCD screen is completely erased. Otherwise, DCD goes to safe mode and battery is also drained progressively.

3.1.1.4 Sending Data from Metering Locations to RLDC

Step 1: Attach the appropriate *.MRI or *.dat file from sub-folder “Data” of “Smartgrid” or “Vincom” folder in an e-mail message.

Step 2: e-mail the message to [email protected] or [email protected].

3.1.2 Data Collection from SEM through RS-485 Scheme

RS-485 scheme facilitates automatic data downloading from all the meters in a location to a local PC. RS-485 standard is a balanced data transmission scheme with two wire connectivity (having ground). L&T make SEMs are RS-485 compatible having DATA (+), DATA (-) & GROUND terminals in its RS-485 terminal block. However, as RS-232 (serial binary data communication) is used in Computer serial ports, RS-485 to RS-232 converter is required for communication between a meter and PC. RS-232/9 pin serial port of PC is connected with RS-232 port of converter and RS-485 port of converter is connected with the RS-485 terminals of SEM.

Data Dumped ***** Bytes

Clearing DCD

34

The following connection diagram shows four meters connected in parallel to a PC using RS-485 scheme of data communication. A write up on RS-485 / RS-232 is enclosed as Annexure-I

Terminal block of L&T make SEM showing CT, PT, RS-485 connectivity.

R Phase PT lead

B Phase CT leadY Phase CT lead

R Phase CT lead

Y Phase PT lead

B Phase PT lead

Neutral lead

RS485-Ground

RS485-DATA(-)

RS485-DATA(+)

3.1.2.1 Data Collection through RS-485

Ensure the connection arrangement of meters, converter and PC as shown in

above figure.

Step 1: Open the “Vincom” software with appropriate login ID and password.

Step 2: Select “Remote Meter” and click on “Scheduler”. Scheduler is a template to collect metered data in a predefined manner.

Normally, a scheduler contains all the meters connected to the local PC through converter. Scheduler is configured before hand by allocating unique Slave IDs to each meters and collection time.

RS 232

D +

D -

RS 232 to RS 485Converter

Substation PC

Special Energy Meter

35

Step 3: After clicking on “Scheduler”, a separate window will appear. Select appropriate scheduler templates & click on “Start Scheduler” option to initiate the data collection from meters.

Metered data will be collected in a sequence as defined in the scheduler. While

collecting data from a meter, all fields against that particular meter will be displayed in blue colour on the scheduler screen. On successful data collection, the fields will turn green. Otherwise, the fields will turn from blue to red. Scheduler will temporarily skip the said meter and proceed with data collection from other meters in the list. Thereafter, scheduler will make repeated (pre-defined) attempts to collect data from the meters skipped earlier. However, if Scheduler fails to collect data of any meter even after

36

repeated attempts, it will stop. Generally it can happen if a particular meter is powered off; in such a case external 63.5V single phase supply is to be provided to the meter before running scheduler for data collection.

The resultant *.DAT file will contain data of all the meters which could successfully communicate with the Scheduler.

Step 4: All metered data will create a single *.DAT file and save in “Vincom” folder of local PC by default.

Step 5: Close the window and exit from “Vincom” by Logging out.

Step 6: Attach *.DAT file and e-mail it to [email protected] or

[email protected]. 3.2 Data Collection Locations in NER Sl. No Location Data collection from Nodal officer Contact No.

01 Aizawl (PG) Aizawl (PG) H.L. Siama (Mgr) Pranjal Gogoi (AE)

09436352277 09436352279

02 Jiribam Jiribam/Pailapool A.B.K Singh(Mgr) 09435503495

03 Haflong Haflong Manish Barman (JE) 09435712885 03673-236405

04 Salakati Salakati/B’gaon/Gelephu H.Talukdar (DM) 09435560899

05 Misa Misa/Samaguri Arindam Sharma(DM) Ms. Binita Sarma (AE)

09435539241 09435539234

06 Kumarghat K’ghat/D’nagar/P.K.Bari H.R.Choudhury(Mgr) Abhilash Das (AE)

09436463805 09436463804

07 Dimapur Dimapur/Kohima /Bokajan

D.Bramha ( Mgr ) Jitu Gohain (AE)

09436602685 09436602686

08 Imphal (PG) Imphal(PG)/Imphal Babul Roy (DM) 0385-2436211 09 Loktak Loktak B.B.Sharma(Sr.Mgr) 09436038547

10 Nirjuli Nirjuli/Gohpur /Naharlagun Tasso Bida(DM) 09436227757

11 Khliehriat(PG) KHLT(PG)/(MeSEB) A.R.Choudhury (DM) 09436335257 12 Badarpur B’pur/P’gram/D’cherra Mridul Nath (AE) 09435567398

13 Balipara Balipara/ Khupi/Kimi K.K.Medhi (CM) Dharmendra Kumar AE

09435521525 09435711183

14 Kahelipara (ASEB) Kahelipara/Sarusajai Jatin Baishya(Sr. Mgr)

Ms. Lekha Bhuiya 09435041494 09864025116

15 Jorhat Kathalguri/Mariani D. Pegu (Engr.) 09435093639

16 NEEPCO DHEP/ RHEP/KHEP /AGBPP/AGTPP Arup Sharma (CM) 09436304964

17 Agartala Agartala(79-Tilla) Ms. Sampa Sen (Mgr) 09436120263 18 Sumer-MeSEB Umtru, Stage –IV A. Kharpan (EE) 09436117802 19 Lumshnong MeSEB A.R.Choudhury (DM) 09436335257 20 Ziro Ziro N.Kojen (CM) 09436227761 21 Rupai Rupai N.Bhattacharjee 03759-241686 22 Rokhia Tripura - - 23 Baramura Tripura - - 24 Gargaon ASEB S.Bhowmic (Sr. Mgr) 09435337189 25 Lekhapani Jairampur (AP) R.Singh (JE) 09436057439 26 Mokokchung Nagaland Atomo Achumi 27 Tinsukia ASEB N.Bhattacharjee 03759-241686 28 Deomali Deomali (AP) H. Rajen Singh(CM) 09436227760

29 Aizawl (Mizoram)

Bairabi/ Bawktlang

S. Das (SDO) Swama(JE)

09436362308 09436143077

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3.3 Automating Meter data Collection / Transmission Special Energy Meters were installed in NER during 1995-96. For past 12 years,

data collection from meters through DCD as well as data transmission to RLDC from metering locations through internet is being carried out manually. Automating both the activities, i.e., data collection from the meter and data transmittal to RLDC would help in total elimination of manual intervention in the entire chain of activity. 3.3.1 Automatic Data collection

Implementation of RS-485 scheme would enable automatic data collection from all meters in a location to the local PC. In NER, RS-485 is in place in 400/220KV Misa substation of POWERGRID. By end of 2008, the scheme will be implemented in all NER metering locations having more than two SEMs.

3.3.2 Automatic Data Transmission

Meter data stored in PC at the metering locations can be automatically transmitted to RLDC using dedicated communication system like VSAT, OFC etc. A schematic of automatic data transmission system being implemented by ASEB is as below:

Automatic Meter Data Transmission Schematic in Assam System of NER

In NER, the possibility of automatic data transmission utilising wideband communication network of ULDC or GSM network is being explored. As all POWERGRID substations are getting connected through WAN shortly, automatic data transmission from all POWERGRID locations could also be possible through WAN.

*************

Metering architecture of ASEB for Intra-State ABT

Meter

DataConcentrator

DataConcentrator

Meter Meter

Ethernet Switch

Local PC Local OnlineMonitoring

Meter

Wideband communication SLDC

SECTION 4

DATA PROCESSING &

COMPUTATION

38

In this section all activities have been discussed in details, sequentially, starting

with receipt of SEM data at NERLDC till sending processed meter data to NERPC for computation and issuance of weekly Unscheduled Interchange (UI) Account as well as Reactive Energy Account. Further, in the concluding part of this section, a brief on post processing activities and data archival has also been covered. 4.1 Receipt of SEM Data at RLDC

Meter data (.mri and .dat files) downloaded at various locations of NER are electronically sent to NERLDC through e-mail. First activity pertaining to meter data begins after receipt of these data at NERLDC preferably by Tuesday of every week. The data are viewed and checked to ensure that data of every meter under the jurisdiction of a particular location have been collected as per stipulated time frame. Initially, received meter data in binary format (*.mri in case of Secure Meters and *.dat in case of L&T Meters) is temporarily stored in a directory for viewing / checking. Following naming format is used in case of binary files:

ddmmXXX.mri ddmmXXX.dat

where, ddmm is date and month of collecting data

XXX is three letter code for the location

For example, data collected at Jiribam on 05-05-2008 (Monday) is named as 0505JBM.mri. As data is to be collected on every MONDAY, ddmm naming corresponding to Monday is done even if data is collected on Tuesday for some reason. All locations are naming the files accordingly before sending. In case of aberration, proper naming is given at NERLDC on receipt. 4.2 Softwares for Data Viewing / Conversion to TEXT File

Softwares for viewing of meter data and converting Binary files to text (NPC) files are supplied by Meter manufacturers.

For Secure Meter: View1 (DOS Based) SMARTGRID

For L&T Meter: VINCOM

4.2.1 Secure Meters

Although both View1 and SMARTGRID Softwares can be used for viewing data and conversion of binary data to NPC format, generally viewing is done through View1, being more user friendly. Subsequently, SMARTGRID is used for conversion to NPC file. (a) View1 Software: View1 program requires that the program is present in the same location as the .mri files. In NER, *.mri files from various locations are downloaded to a particular folder named secure defined by the pathname D:\secure.

39

Step-1: To open double click on view1. This opens the utility view1 in a DOS window along with a small interactive message box - REVISION.

Step-2: At this interactive window press Y to continue.

40

Step-3: View1 program is menu based which can be accessed using navigation and Enter keys of the keyboard. To view the contents of a particular file select options File – Pick using the navigation keys and press Enter.

Step-4: Using the navigation keys select the desired file from the displayed list and press

Enter. The main menu screen is displayed next.

41

Step-5: At the main menu select View – Mid night data and press Enter.

Step-6: The details of the selected file are now displayed on the screen. This display

consists of the following relevant parameters –

Filename :0704AGT - mri file selected DCD No.: KDP004 - serial no of the DCD used for data collection Rec. No.:01 - record number for the first meter data and can

include additional records in chronological order depending on the number of meter data present in the file

Meter Serial No.:NP0302A - meter corresponding to Rec. No.

Date & Time: 8th Apr 2008 16:08hrs - date and time of data collection Security: GOOD - check result of data -GOOD or BAD Low Vol Flag :No - whether low voltage condition encountered –Yes or No Time Advanced:No - whether time advance command executed – Yes or No Time Retarded:No - whether time retard command executed – Yes or No Time Correction Count:0 - No. of occasions on which time correction

command was executed

On viewing a mri file through view1 the corresponding amr file is automatically generated in the same location, viz., D:\secure.

42

Step-7: Press Esc to go to main menu and select Quit – Quit. A confirmation message will appear at the bottom of the DOS screen. Enter Y to exit the view1 program.

In case any meter data is missing the same is conveyed to the concerned person at the field accordingly for necessary action.

43

(b) SMARTGRID Software

A folder named ddmmyy is created in D: drive and all mri files of the said date is transferred to this folder before creating NPC file. Subsequently, on conversion, NPC files corresponding to respective .mri files also reside in the same folder.

Step-1: Click on the Smartgrid icon on the desktop This will open the User Login window as shown below.

Step-2: Log on using appropriate Name and Password And then click the OK button to open Smartgrid.

44

Step-3: Click on MRI Communication from MRI of main menu. This will open a small window inside Smartgrid window. Ensure selection of following options MRI Type Analogic MRI Protocol Type SMART Protocol

Step-4: Now click on Upload MRI button to open a small navigation window. Step-5: Select all the files (*.mri) at a time from the desired location using Ctrl + A keys

to upload the selected files to Smartgrid. Then click on Open button.

Step-6: Acknowledge the message after successful upload of all selected mri files by

clicking on OK button.

45

Step-7: Now close the MRI Communication window by clicking on the Close button to go back to the main menu.

Step-8: Click on Data on the main menu and then click on Convert in the sub-menu for

conversion of the mri files to respective NPC files.

46

Step-9: This will open a small window called the ASCII conversion settings. Ensure the following options are selected, Text file type Make NPC File No. of characters in serial number First seven Then click on OK button to open a navigation window in the same location.

Step-10: As in Step 5 select all files at a time from the desired location using Ctrl + A

keys to create the NPC files of the selected files. Then click on Open button.

Step-11: Acknowledge [Files made successfully] message on completion of the NPC file

creation by clicking on the OK button.

47

Step-12: Now click on Close button to go back to the main menu.

Step-13: Finally close the Smartgrid window. All mri and NPC files are stored in respective D:\ddmmyy folder. 4.2.2 L&T Meters

Binary files of L&T meters are in ddmmXXX.dat format and are also stored in the location D:\ddmmyy as in case of Secure Meters. Here, VINCOM is used for conversion to NPC format. VINCOM Software

Step-1: Click on the Vincom icon on the desktop Vincom.lnk This will open the Login window as shown below.

48

Step-2: Login using appropriate Name and Password This will open the menu driven Vincom user interface as shown below. Step-3:Click on Import from Data in main menu to open a small window within

Vincom.

Step-4: Use Browse button to select the desired dat file and click on Open button.

Unlike Smartgrid here only one file can be selected at a time.

49

Step-5: Now click on Import button.

Step-6: On successful import a message will appear. Thereupon one can repeat Steps 4

to 5 to import additional dat files. One can also close the import data window by clicking on Close button.

50

Step-7: Click on Conversion To Text option of main menu to convert the imported file

to text file. This will open a small window named Convert To Text within the main window.

Step-8: Select the desired file based on the date and time of import of the concerned file

which appears in the drop down list of the Select Date/Time entry field. This is often very tricky as one has to keep track of the particular file according to the date and time of import. To work around this issue a file is imported and converted to text file before proceeding with import of next file.

51

Step-9: Then Click on the browse folder button to open the folder/file navigation

window. Select the location where the converted text file, i.e., npc file will be saved. The file name usually ddmmXXX.npc has to be keyed in the field provided for file name. Then click on open. By default the file is saved in Vincom folder. Moreover the program does not allow over writing a pre-existing npc file. To work around this issue, it is ensured that npc file of same ddmm file does not exist.

52

Step-10: Now click on the Convert button to start the conversion process.

Step-11: On successful conversion acknowledge the message by clicking OK button.

Step-12: Next click on the Close button to exit the Conversion to Text window and go to

the main menu.

53

Step-13: To close Vincom click on the close button of the main menu, this will ask for a

confirmation to quit the application.

Step-14: Click on Yes to exit.

54

4.2.3 Structure of NPC File

Now that *.NPC files for both Secure and L&T meters have been prepared, let us discuss the structure and contents of the .NPC file for better understanding of the basics before subsequent data processing. Each .mri/.dat file has its corresponding .NPC file.

The general structure and organization of a typical .NPC file is reproduced below.

The line WEEK FROM 0000 HRS OF 07-04-08 TO 1238 HRS OF 16-04-08 implies that file contains data from 0000 Hrs of 7th Apr’08 to 1230 Hrs of 16th Apr’08, i.e., the last 15 min block data of 16th Apr’08 at the time of data collection which is 1238 Hrs of 16th Apr’08.

The next line NP-0302-A 67124.5 44891.9 97902.9 07-04-08 contains

following information – 1. Meter Serial No (NP-0302-A) – wherein NP stands for National Power

Transmission Corporation the former name of Powergrid Corporation of India Limited followed by a 4-digit meter serial number and finally an alpha code (A or B) to indicate secondary CT current (A for 1 ampere and B for 5 ampere).

2. MidNight Net Wh (67124.5) - This is a cumulative register reading which

indicates the initial Net active energy in Wh at the beginning of the day. This cumulative register records Net active energy in Wh on daily basis.

3. Reactive High Energy (44891.9) 4. Reactive Low Energy (97902.9) There are two cumulative registers which record the reactive energy (VARh)

exchange on daily basis under high and low voltage conditions, i.e., when RMS voltage is >=103%Vn and when RMS volage is <97%Vn but >70%Vn

Cumulative net Wh, net VARh for voltage high and voltage low condition at each midnight is recorded in 5 main digits and 1 decimal digit. These figures are always positive and cycles from 0 to 99999.9 in forward or backward direction depending on energy export or import.

55

5. Date (07-04-08) – This indicates that the 6 Rows X 16 Columns arrangement of data pertains to this date.

Next is the blockwise data arranged as 16 block data in each row and total 6 rows for complete 24 hours (96 time blocks of 15 min each) data with the following format: StartingHour AvgFreq StatusIndication NetEnergy AvgFreq StatusIndication NetEnergy....

StartingHour indicates the time in hour at the beginning of each of the 6 rows. AvgFreq (average frequency) is recorded for every 15 min block as a 2-digit code ( 0 to 99) and is computed based on the no. of voltage cycles in one 15 min block divided by (15*60=900). Computation of average frequency is done only for the period during which the VT supply was available in the 15 min block under consideration. The frequency data is available for each successive 15 min block in encoded form as (Average frequency – 49)*50 and neglecting decimals. When frequency is <=49 it is recorded as 0 and when the frequency is >=51 it is recorded as 99. The actual frequency corresponding to two consecutive codes differ by 0.02Hz.

StatusIndication may be either ‘*’ to indicate supply down or supply failure which might be momentary or might have lasted for several blocks Or ‘rr’ to indicate time retardation undergone Or ‘aa’ to indicate time advance undergone. Finally sum of net energies (96 blocks) is given at the end of last row of the day having complete 24 hours data.

Advance/Retard RTC command : Using these commands, 6 consecutive 15 min time blocks are contracted/elongated by 10 seconds each (with the first 15 min block being the closest 15 min block from the time of keying in the RTC command). Moreover once advance/retard RTC command is given, a lock-out of seven days sets in which implies that the next RTC command can be given only after seven days of the earlier RTC command. This implies that only 1 min time correction can be executed over a week. There is ‘aa’ or ‘rr’ indication stamped against the corresponding 15 min time blocks for which advance or retard RTC was executed. A ‘*’ indication implies power failure in the corresponding 15 min block or RMS voltage in any or all phases was <70%Vn for at least 3 secs.

NetEnergy (active energy) is recorded by the meters in Wh for every 15 min based on the average active energy exchange for the time block considered. Net Wh data is available for each successive 15 min time block up to second decimal with plus/minus sign corresponding to energy export/import. 4.3 Appending Text Files

Now that there are multiple npc files, it is desirable, for better file management, that these files are combined into one single large file. For this an utility program “APPEND” is used which compiles all individual .NPC files into a regional .NPC file named ddmmSREA.NPC. The “APPEND” utility considers only those files which has the same ddmm prefix to the filenames as prompted while running “APPEND”.

The appended file contains the complete meter data of the region for the relevant

period in text form and is used in all subsequent processing. The APPEND program is required to be copied to the concerned ddmmyy folder as the program appends all the relevant files present in the folder in which the APPEND program is also resident.

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Step-1: Double click on APPEND to open a DOS screen as shown below.

Step-2: Enter 2-digit figure for day, i.e., dd. Press Enter. Step-3: Enter 2-digit number for month, i.e., mm. Press Enter to start the append operation. The above illustration assumes appending files for 7th Apr 2008.

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After completion, a message FILES are appended successfully appears.

Step-4: To exit the program, press Esc. The regional npc file (ddmmSREA.NPC) is now created in the ddmmyy folder.

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4.4 Processing of SEM Data / Computation of Net Injection & Drawal

This section describes the procedures and steps involved in computation of drawals by the states, injection by ISGSs, TieLine exchange between NER and ER, etc to mention a few. Some additional files, called check files, are also created to facilitate troubleshooting, internal analysis and database creation. The resultant energy figures are further validated through an elaborate process of Data checking and validation to ensure that the UI and Reactive energy Accounts issued by RPC are accurate and acceptable to the stakeholders. 4.4.1 Computation of Drawal / Injection from meter data

At present, a DOS based software developed by SRLDC named rea2006 is used for SEM data processing and computation. The executable file is kept in the location D:\SEMAZE1. The appended NPC file has to be copied in the same location for data processing. The appended text file “ddmmSREA.NPC” is used for meter data processing to calculate the actual figures pertaining to State Drawal and ISGS Generation and ER-NER Tieline flow. Step-1: From the location D:\ddmmyy Copy the regional .NPC file, “ddmmSREA.NPC”

to D:\SEMAZE1.

Step-2: Paste the file in “D:\SEMAZE1” folder.

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The executable file rea2006 is also present in the same location, D:\SEMAZE1.

Step-3: Open “rea2006” from “D:\SEMAZE1” folder and follow the steps as given

below:

a) Click “DATA CORRECTNESS” under “INIT” option of main menu for checking the data formats. This option creates a new file named

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“ddmmSREA.CHK” which can be used for checking the data structure if required. Key in the filename (ddmmSREA.NPC) when prompted and press Enter.

b) Next click “CREATE DATA BASE” under “INIT” option of main menu for

creating date wise Folders. As in Step(a), key in ddmmSREA.NPC at the cursor prompt and press Enter.

c) Next click “DATA NOT RECEIVED” for viewing “ddmmSREA.NRX” file

which lists the meters whose readings are not available in the particular “ddmmSREA.NPC” file processed. This helps to decide whether any back-up meters are to be used as main meter data is not available. Here too, as in the previous steps, ddmmSREA.NPC is required to be entered at the cursor prompt. Press Enter to continue.

d) Next click on “COMPUTE” option of main menu and open ”COMPUTE

ENERGY” for preparing “*.NPD” and “*.MWH” files for all meters which gets stored in respective date wise folders in “D:\SEMBASE”. Here a listbox displaying all meters as per location ID and Meter No appears on the left halve of the screen. Press Ctrl + A to select all items of the listbox at a time and press Enter. This will open another listbox of dates on the right halve of the screen besides the first listbox. Select the dates for which data processing is to be performed. MASTER Frequency Meter: One Special Energy Meter is chosen as Master frequency meter and frequency code recorded by that meter is used for all calculations. At present one SEM at Korba in WR (NP-2645-A) is used as master frequency meter in NR-ER-NER-WR (NEW) Grid and data of this meter is sent to all RLDCs by WRLDC. Details of master frequency meter are stored in FRQMASTER.DAT file. If in any particular week/day, Korba meter (NP-2645-A) reading is erroneous or missing or incorrect then use Durgapur meter (NP-0550-A Or NP-0518-A) reading and in such case edit “FRQMASTER.DAT” file in “D:\SEMAZE1” folder to take appropriate meter as the master frequency meter for capturing frequency data.

e) Afterwards click “COMPUTE FICTMTRS” for calculating Constituents

drawal /injection as per fictitious meter configurations and create “*.MWH” for all the fictitious meters which gets stored in respective date wise folder in “D:\SEMBASE”. As in the previous step, under this option also, a listbox displaying all pre-defined fictitious meters appears. Select all items on the listbox at a time using Ctrl+A and press Enter. This will open another listbox to the right of the earlier listbox. Select the desired dates as in previous step. Press Enter to continue.

f) Finally go to “ACCOUNT” option of main menu and click “MWH OUTPUT” for calculating MWH drawal/injection for all configured “*MWH.CFG” files. These output files are stored in “D:\SEMBASE\MWH” as ddmmyy.XXX where XXX signifies the 3 character name of the beneficiary.

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At this option, like earlier steps, select all items on the left listbox and the dates from the right listbox and press Enter to continue. Note: Dates selected in Steps (d), (e) and (f) must be identical and same. If any meter is replaced by its corresponding other end meter (or by some other combination of meters) as per “MASTER.DAT”, the same must be reflected in both “*_MWH.CFG” as well as “FICTMTRS.CFG” files of “D:\SEMAZE1” folder.

g) Next go to “MVARH OUTPUT” for calculating MVARH for all the

configured “*MVAR.CFG” files which gets stored in “D:\SEMBASE\Mvarh”. From the listbox on the left select the items “STATES” and “INTER” and press Enter. This will open a second listbox to the right of the earlier listbox. Select the desired dates consistent with the dates selected in earlier steps and press Enter to continue. At any menu or options window, press Esc to come out from the active screen to the previous screen.

h) To exit the rea2006 program, press Esc at the main menu window and enter Y

when asked for confirmation.

After successful completion of rea2006, a number of output files are created and stored in their respective locations as already mentioned above. Being text files, these output files are readily recognized by Windows operative system. The MWh output files are created one for each day with 96 rows of data against multiple columns (each column has a self explanatory heading). The MVARh output files created through Step 3(g) are however different in the sense that these files have seven rows of data each row depicting the cumulative VAR data for one day.

All MWh & MVARh output files are stored in the folder D:\SEMBASE\MWH & D:\SEMBASE\MVARH respectively, as already mentioned earlier.

Output MWh files pertaining to States’ Drawal, ISGSs’ Injection and ER-NER Tieline flow are created. These files are as follows:

1. ddmmyy.ARP – Feeder wise drawal of Arunachal Pradesh 2. ddmmyy.ASM – Feeder wise drawal of Assam 3. ddmmyy.MAN – Feeder wise drawal of Manipur 4. ddmmyy.MEG – Feeder wise drawal of Meghalaya 5. ddmmyy.MIZ – Feeder wise drawal of Mizoram 6. ddmmyy.NAG – Feeder wise drawal of Nagaland 7. ddmmyy.TRI – Feeder wise drawal of Tripura 8. ddmmyy.IDY – Feeder wise injection of Doyang HEP 9. ddmmyy.IKD – Feeder wise injection of Khandong & Kopili-2 HEP 10. ddmmyy.IKP – Feeder wise injection of Kopili HEP 11. ddmmyy.IKT – Feeder wise injection of AGBPP, Kathalguri 12. ddmmyy.ILK – Feeder wise injection of Loktak HEP 13. ddmmyy.IRC – Feeder wise injection of AGTPP, R C Nagar 14. ddmmyy.IRN – Feeder wise injection of Ranganadi HEP 15. ddmmyy.ERI – Feeder wise energy exchange through ER-NER Tielines

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In addition, one more MWh output file, ddmmyy.UI_, is also created which can be considered as NER Summary file and consists of columns for data pertaining to Drawal by each State, Total StateDrawal, Generation by every ISGS, Total NER Generation, Net ER-NER Tie line flow and Transmission loss.

For example, if one executes rea2006 for 04-05-2008, then the output file

040508.IRC created for an ISGS Station AGTPP, R. C. Nagar showing its injection will have the following structure:

The file shows net injection through three outgoing EHV feeders and total injection in MWh during each 15 min. time block as well as total figure for the day against the relevant columns.

Similarly, the output file 040508.TRI created for Tripura showing its drawal will

have the following structure:

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Here it can be seen that the file shows net drawal through four EHV feeders and

total drawal in MWh during each 15 min. time block as well as total figure for the day against the relevant columns.

Likewise, other output files are also created.

4.4.2 Data checking and validation

Before proceeding further it is very important to carry out data checking and validation. Through this process it can be established whether the SEMs are recording data correctly. This is done by manual check of few additional files called check files created through rea2006. These check files are all MWh output files and are stored in the folder D:\SEMBASE\MWH in the ddmmyy.XXX format. In case of any discrepancies observed, corrective action has to be taken, like say, intimation to concerned agency for replacement of meters, use of alternate meters for computation of energy in case main meter is showing incorrect data, etc. The check files are:

1. Net bus check of substations- ddmmyy.NSS This file contains the summary of the net bus of all important substations. In case net bus figure of one or more sub-station shows a wide variation than normal then net bus file pertaining to the individual station can be examined. The file extensions are appropriately coded to give an indication of the sub-station like NBG(Bongaigaon), NBP(Balipara), NMS(Misa) and so on.

A typical file 040508.NSS for net bus check of substations for 04-05-2008 is

reproduced below. This file has data arranged in 96 rows for every 15 min block of the day and columns indicate the net bus figure of the substation, say, Aizawl, Badarpur, etc.

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For better understanding and troubleshooting, a further detail of a particular substation is available in another file, say, 040508.NAZ pertaining to net bus of Aizawl substation. The file is reproduced below.

Similarly, details of other substations can be examined through their respective

net bus check files. 2. Net bus check of generators- ddmmyy.NGN

This file is a summary of the net bus of all ISGSs. In case any discrepancy is observed against one or more ISGS, the same is further investigated through the net bus file of the concerned ISGS say NLK(Loktak), NKT(Kathalguri) and so on.

The file 040508.NGN for net bus check of ISGSs for 04-05-2008 is reproduced

here.

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Further details of any particular ISGS, say, Kopili for 04-05-2008 is also available in the file 040508.NKP for examining the net bus details of Kopili. The file is reproduced herein.

The additional columns on the right which are not visible in the above screenshot

have been reproduced below in continuation to the above for proper understanding.

3. End1-End2 (pair) check- ddmmyy.LL1, .LL2, .LL4, .LL5,…, .LL9 These file are created to facilitate pair check of back to back meters connected across the transmission lines. The first two files LL1 and LL2 are summary files depicting the difference in readings of End1 SEM and End2 SEM

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(computed loss) of important lines. The corresponding End1 and End2 meter readings along with the difference are present in other LL files from LL4 to LL9.

The file 040508.LL2 is reproduced here showing 96 block data for 04-05-2008

pertaining to difference between End1 and End2 meter readings for the transmission lines as mentioned against respective column headings.

Now to examine the End1-End2 meter readings along with the difference for the

line, say, 132KV Doyang-Dimapur I & II on 04-05-2008, we have to open the file 040508.LL7. The file is as reproduced below showing the 96 block data pertaining to 132KV Doyang-Dimapur-I and 132KV Doyang-Dimapur-II.

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Identification of any metering error can be done through the three broad categories of check files as explained.

(a) Net Bus of Sub-Stations (b) Net bus of Generating Stations and (c) Pair check (End1 – End2 of lines) 4.5 Finally Implemented Schedule

Though the schedules are prepared on day-ahead basis, i.e, one day before the day of operation, it is always expected that on the day of operation the schedule will undergo multiple revisions on account of various operational considerations. Finally, at the end of the day’s operation, the last revised schedule is in fact the final operational schedule for that day. This schedule is further reconciled (if required) with all the beneficiaries of the region and adjoining region, viz., ER to arrive at a dispute free schedule as regards ISGS injection, States Drawal and Inter-regional Tieline - technically referred to as Implemented Schedule.

As described in the preceding section, all actual figures pertaining to Drawal, and Injection have been calculated from the meter data. Now in order to compute the unscheduled Interchange (UI) it is required that implemented schedules for the corresponding days are also available. The Schedule files are created, revised and stored in the Scheduling console kept in the Control Room of NERLDC. Meter data processing and UI computation are carried out on a different computer in Commercial department.

The last revised finally implemented schedules of the relevant period are copied from Control Room PC to Commercial Department PC and further processed to achieve the following:

(a) Renaming to a common format (ddmm-Final) (b) Extracting the data/information which are required for accounting

purpose like - DC / MAC / Net Injection Schedule of ISGSs - Net Drawal Schedule of States - Net Schedule of Inter Regional Links

A number of customized routines (MACRO) have been developed to carry out the entire chain of activities from import of Finally Implemented Schedules to computation of UI. The MACROs are written in Visual Basic and executed on MS-Excel platform. These routines have been developed to minimize human errors normally encountered in repetitive type of activities. These macros are present in an excel file, E:/All_Macro wef ddmmyyyy.xls and are modified from time to time based on need.

For the purpose of submission of implemented schedules to RPC the following sequence of activities are carried out: Step-1: Copy the last revised schedule from Scheduling PC of Control Room

(\\ia0co1\SCHEDULING and COMMERCIAL\SCHEDULE\sch yyyy\MMMyyyy) to nelcomml-1 PC (E:\C-Manipur\SCHEDULE\As implemented\Mmmyyyy\temp).

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Now go to E:/C-Manipur/SCHEDULE/As implemented/Mmmyyyy/temp)

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Step-2:Rename the last revised schedule using RENAME LAST REVISED SCHEDULES (E:/ All_Macro wef ddmmyyyy.xls). This retains only “ddmm-dlysch” portion for all the desired files selected through the macro.

Step-3: Using “All_Macro wef 31032008” prepare Finally Implemented Schedules

“ddmm-Final”. Use “MACRO FOR PREPARATION OF FINAL SCHEDULE” button & click on “START” button. Proceed as per instructions.

4.6 Sending Data to RPC

Data pertaining to SEM and schedules of the relevant week are required by NERPC in order to issue weekly bills for UI energy and Reactive energy. The data are compiled in a CD and has the following folders/contents:

1. Daily Schedule This folder contains daily final implemented schedule files – ddmm-Final.xls 2. Constituents Drawal This folder contains daily (15 minute time block wise) computed drawal files of

all the states of NER – ddmm.XXX where XXX is a 3-character code of the state, like ASM for Assam, ARP for Arunachal Pradesh and so on.

3. ISGS_Injection This folder contains daily (15 minute time block wise) computed injection files

of all the ISGSs of NER – ddmm.YYY where YYY is a 3-character code of the generating station, like IDY for Doyang, IKT for Kathalguri and so on.

4. ER-NER Exchange This folder contains daily (15 minute time block wise) computed power flow

files concerning ER-NER inter regional links – ddmm.ERI. 5. SEM_Data This folder contains processed sem data (NPxxxxA.MWH / NPxxxxB.MWH files)

arranged in date wise folders, regional NPC file (created by appending individual NPC files) which is a compilation of all meter data available at NERLDC for the period concerned, discrepancies file mentioning relevant deviations (if any) to be considered during computation and the MASTER.DAT file which is a detailed list of all SEMs (location IDs, meter no., CT / PT ratio and feeder where the meters are installed) in NER.

The CD is self sufficient to independently carry out the necessary activities and

prepare the relevant weekly accounts, viz., UI and Reactive energy accounts.

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Step-1: Processed SEM data is required by NERPC for issuance of weekly UI energy bill and Reactive Energy Bill. Compile all relevant data for NERPC using “MACRO FOR COMPILATION OF NEREB DATA” of “AllMacro” sheet and proceed as per instruction. This creates a folder in “D:\SEM_Scheduling_Data” named “Mmm_yy_Week_ddmm-ddmm”.

Step-2: Edit “discrepancies” file in “D:\SEM_Scheduling_Data\Mmm_yy_Week_ddmm-ddmm1\SEM_Data” folder to intimate NERPC regarding any deviation adopted for UI computation for the particular week. Mention LT feeder assumptions to be considered.

Step-3: Burn the data onto a CD and send the same to NERPC.

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4.7 UI Computation

The next activity involves computation of Unscheduled Interchange (UI) charges from actual metered data and implemented schedules for the period concerned. These data are already available to us through the procedures described in the earlier sections.

UI energy is the deviation of actual energy, either drawl or injection, from the

scheduled energy. Mathematically, this can be computed as UI Energy = Actual Energy – Scheduled Energy. This UI energy is multiplied by the frequency dependant UI rate to calculate the UI charge. The UI rates are revised from time to time through CERC orders. The frequency dependant UI rate chart presently in force is reproduced below:

However, finally implemented schedules are in MS-Excel format and actual

metered data are available as output files in text format through rea2006 utility program. Computation of UI requires that both the source files are in MS-Excel format. This is achieved through number of MACROs as explained in this section.

Step-1: Copy finally implemented schedules from “Mmmyyyy” folder to “D:\UI_GRAPH” using the macro “Copy Final Schedules to D:/UI_GRAPHS”. Finally implemented schedules are used as reference data for UI calculation.

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Step-2: Next use “MACRO FOR UI FILES” option and proceed as per instruction to convert the text files ddmmyy.UI_ into excel files (ddmmUI.xls). The files thus created is available in “D:/UI_GRAPH” for the period selected ( 7 days) and data from these files are considered as actual data for UI calculation. Additional files for Var Data are also created and linked accordingly.

Step-3: First ensure “Graph_ABT_01.11.03” file is correct as regards LT feeder data for

Arunachal Pradesh, Nagaland & Assam (Powergrid consumption).

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For this go to “arpdat”, “asmdat” & “nagdat” sheet of the base file

“Graph_ABT_01.11.03” available in the location “D:\UI_GRAPH” and check whether data approximations for LT feeders are consistent with corresponding meter data received for the relevant period and correctly accounted for UI calculation of Arunachal Pradesh, Assam and Nagaland.

Incorporate changes (if any) in the LT meter approximations and save the file so

that appropriate LT feeder data will be available in the base file. This data will then be used along with the actual and scheduled figures for UI computation.

Data used for approximation are taken from the LT feeder readings submitted by

ASEB from time to time concerning Gorgaon, Lekhapani, Chanki and Rupai. The Graph_ABT_01.11.03.xls file is a linked MS Excel file which is updated with

appropriate data - metered data (ddmmUI.xls) and scheduled data (ddmm-Final.xls) pertaining to a particular day. Thereupon corresponding UI energy and UI money is computed. This file is finally stored as “ddmm.xls” implying that all data in this file pertains to this particular day. For example the file 0405.xls contains data and UI calculations pertaining to 04-05-2008.

All these activities of updating data, calculation of UI energy and money and saving the same as per ddmm.xls format is done by running “MACRO FOR GRAPH FILES”. These files are created in “D:\UI_GRAPH”. Step-4: Archiving of all files named “ddmm.xls” for the week concerned is done in

“D:\UI_GRAPH\Mmmyy\Mmmyy_graph” folder.

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Similarly files named “ddmmUI.xls” and 2 nos. Var Files for the concerned week are archived in “D:\UI_GRAPH\Mmmyy\Mmmyy_ui” folder.

Step-5: For compilation of weekly UI data use “MACRO FOR COPYING GRAPH FILES FOR UI_CALCULATION AND POWER_POSITION” in the “Utilities” sheet to copy relevant “ddmm.xls” files to “D:\ui_calculation” folder. Copy the previous weekly UI file (weekly_ui_ddmmDDMM_yy.xls) and name it appropriately to indicate the period of UI data present in the file. Update the file with data from concerned “ddmm.xls” files.

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Step-6: Copy the weekly UI file created through Step-5. The file consists of a sheet “NER-SCH-ACT-SO”. Edit the weekly UI file to retain only this sheet and rename the file as ‘SCH_ACT_ddmmDDMM_yy.xls’.

The following screen shot shows the weekly UI account file and the SCH_ACT file for the period 01-01-2008 to 07-01-2008.

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4.8 Post Processing & Data Archival 4.8.1 Post Processing Activities

1. Data to Corporate System Operation Department Abstract of weekly data pertaining to schedules and SEM reading are also required by various departments. In this context the file “NER-SCH-ACT-SO” is sent to SO department file by email. (e-mail ID: [email protected]).

2. Estimated Loss for Scheduling Moreover, weekly transmission loss figure in percentage available in the worksheet “week-loss” of “weekly_ui_ddmmDDMM_yy” file is noted and corresponding entry of the same is made in the designated register book (LOSS) kept in Control Room. This is used as estimated transmission loss for scheduling in the following week.

3. Postings on Website (www.nerldc.org) Each RLDC maintains a website for public access of pertinent data. In this connection the following data are regularly uploaded on the website of NERLDC: 1. Weekly Schedule vs Actual Figures – Weekly data regarding schedule vs actual

for all the constituents are compiled and uploaded on the website.

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2. Monthly Power Position – Monthly data regarding Availability, Schedule and Actual concerning the ISGSs in the region are compiled after the end of every month and posted on the web for public viewing.

3. Monthly Frequency Profile – Daily 15 min. time block frequency data for the

complete month is compiled uploaded for public access.

4. Data to OS Department of NERLDC for Reports Operation Services (OS) department prepares various reports - weekly / monthly / quarterly and yearly, after compilation and analysis of data collected from various sources. In this context, commercial section provides requisite data related to drawal/injection - both scheduled and actual as well as scheduled bilateral transactions on monthly basis.

4.8.2 Data Archival

All data pertaining to SEM reading are sent from various locations and are very vital from commercial viewpoint. So these data are systematically archived for future reference in case the need arises.

All the *.MRI, *.AMR, *.NPC & *.DAT file are stored in respective D:\ddmmyy folder as indicated in Section 4.2. Also, all the raw data are stored in their particular location folders available in “D:\NERLDC\Mmmyyyy”.

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The screenshot shows the archived files pertaining to NEEPCO for May2008.

The following table shows the archival details of vital files pertaining to meter data:

Archived files Main Back-up 1st Stage Back-up 2nd Stage

Raw meter data nelcomml-1 PC nelcomml-4 PC CD Text(.NPC) files nelcomml-1 PC nelcomml-4 PC CD Net Injection/Drawal files nelcomml-1 PC nelcomml-4 PC CD Implemented schedules nelcomml-1 PC nelcomml-4 PC CD Weekly account nelcomml-1 PC nelcomml-4 PC CD Monthly summary nelcomml-1 PC nelcomml-4 PC CD RPC data nelcomml-1 PC nelcomml-4 PC CD Daily UI_graph nelcomml-1 PC nelcomml-4 PC CD

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ANNEXURES

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Annexure-1

Write-up on RS-232 and RS-485 Standards

RS-232 STANDARD • RS-232 - serial binary data communication between a DTE (Data terminal

equipment) and a DCE (Data Circuit-terminating Equipment). • Used extensively in computer serial ports. • ITU-T standard is V.24.

Voltage levels

• The standard specifies a maximum open-circuit voltage of 25 V, however signal levels of ±5 V,±10 V,±12 V, and ±15 V are all commonly seen.

• Logic one is defined as a negative voltage. • Logic zero is positive voltage.

Slew Rate The slew rate, or how fast the signal changes between levels, is a vital specification which tends to limit the communication rate.

Time

V O L T A G E

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3-wire and 5-wire RS-232 A minimal 3-wire RS-232 connection consist only of transmit data, receive data and ground when the full facilities of RS-232 are not required. When only flow control is required, the RTS and CTS lines are added in a 5-wire version. LIMITATION OF RS-232

• Single-ended signaling referred to a common signal ground limits the noise immunity and transmission distance.

• Multi-drop (connection between more than two devices) operation of an RS-232

compatible interface is not defined; while multi-drop "work-arounds" have been devised, they have limitations in speed and compatibility.

RS-485 STANDARD

• The RS-485 standard is a balanced data-transmission scheme. ANSI TIA/EIA-485. • Communication over long distances and noisy environments. • OSI model physical layer electrical specification:

*2-wire+Ground, *Half-duplex, *Multipoint Serial Connection.

Half-Duplex Full-Duplex

• The standard specifies a differential form of signaling.

Waveform example RS-485 itself does not specify formatting of bytes, format of RS-232 is normally used.

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Noise in straight and twisted pair cables

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RS-232 RS-485 Differential no yes

Max number of drivers Max number of receivers

1 1

32 32

Modes of operation half or full duplex half duplex

Network topology point-to-point multipoint Max distance (acc. standard) 15 m 1200 m

Max speed at 12 m Max speed at 1200 m

20 kbs (1 kbs)

35 Mbs 100 kbs

Max slew rate 30 V/μs n/a

Receiver input resistance 3.7 kΩ ≧ 12 kΩ Driver load impedance 3.7 kΩ 54 Ω

Receiver input sensitivity ±3 V ±200 mV Receiver input range ±15 V –7.12 V

Max driver output voltage ±25 V –7.12 V

Min driver output voltage (with load) ±5 V ±1.5 V L&T Meter connected in Misa Control Room Panel showing

• Meter Serial Number : NP-5301-A • 3 phase 4 wire PT connection • 3 phase CT connection • RS-485 wiring

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Lead wires with Temporary Power supply

RS-485 TO RS-232 Converter

63.5 V supply leads from temporary Power supply arrangement

RS-232 PORT of PC

RS-485 TB

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Screen shot of a Scheduler presently used in Misa S/s

**********

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Annexure-2

VINCOM Software for L&T Meters – Deficiencies

Deficiencies / Limitations of VINCOM Software 1. While Dumping Data from DCD to PC (Refer page 29; Step 7 of manual) While dumping data from DCD to PC, software does not prompt for user-defined file name, rather it saves the file in its own format which is very long, inconvenient and not user friendly. Metering location(s) has to rename the files as per RLDC prescribed format (Refer page 38; Section-4 of manual). If it is not done at metering location(s), same has to be done at RLDC. All these can be avoided if software prompts for user-defined filename at the time of dumping data from DCD to PC. 2. While Converting to Text File at RLDC

(a) Upload/Import Binary Files

Meter data received at RLDC(s) in binary format is to be uploaded/imported to data processing software(s) (SMARTGRID for Secure and VINCOM for L&T). In case of SMARTGRID, all selected files can be uploaded/imported at a time with single keystroke (Refer page 44; Step 5 of manual), whereas in case of VINCOM, only one file can be uploaded at a time (Refer page 48; Step 4 of manual). This unnecessarily multiplies the action for uploading/importing files. (b) Conversion to Text (NPC) File

Next step after upload/import of binary file is conversion to NPC file. In

case of SMARTGRID, multiple files can be selected at a time based on filename and converted to NPC files (Refer page 46; Step 10 of manual). In case of VINCOM, only one file can be converted at a time, that too based on date and time of import of the binary file and not based on name of file. This creates twin problem, firstly limitation of single file selection and secondly selection based on date and time not filename (Refer page 50; Step 8 of manual).

From the above, it can be said that, the system used in SMARTGRID for uploading binary file as well as conversion to text file is more convenient and user friendly in comparison to VINCOM. Therefore, VINCOM software would need some modifications in this regard.

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Metering Manual- Pgcil

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Transcript of Metering Manual- Pgcil