REFERENCE REV

TITLE: SPECIFICATION FOR THREE PHASE METER TEST BENCH STATION

CP_TSSPEC_215 1

DATE: JUNE 2017

PAGE: 1 OF 15

TABLE OF CONTENTS

Page

FOREWORD ....................................................................................................................................... 2

INTRODUCTION ................................................................................................................................. 3

1 SCOPE ........................................................................................................................................... 3

2 NORMATIVE REFERENCES ........................................................................................................ 3

3 DEFINITIONS AND ABBREVIATIONS ......................................................................................... 3

4 REQUIREMENTS .......................................................................................................................... 3

4.1 General .................................................................................................................................. 3

4.2 Sources ................................................................................................................................. 4

4.3 Reference/Working standard .................................................................................................. 6

4.4 Magnetic induction of the MTS ............................................................................................... 6

4.5 Scanning heads ...................................................................................................................... 6

4.6 Meter Testing System (MTS) ................................................................................................ 7

4.7 System Software ................................................................................................................... 7

4.8 Hardware requirements ......................................................................................................... 9

4.9 Technical support .................................................................................................................. 9

5 Training ......................................................................................................................................... 9

6 Quality Assurance ........................................................................................................................ 9

7 Environmental Management ....................................................................................................... 9

Annex A - Bibliography ...................................................................................................................10

Annex B – Revision information ....................................................................................................11

Annex C - Technical schedules A and B.......................................................................................12

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 2 OF 15

FOREWORD

Recommendations for corrections, additions or deletions should be addressed to the:

Technology Services General Manager

City Power Johannesburg (Pty) Ltd

P O Box 38766

Booysens

2016

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 3 OF 15

INTRODUCTION

There is a large number of different types of meters being utilized at City Power at the present moment, ranging from the electro- mechanical and electronic meters that become faulty on site and they need to be tested and calibrated accordingly. New meters should also be calibrated.

1 SCOPE

This specification covers City Power’s requirements for a three phase meter testing system which shall have the capability to test both single and three phase meters. The specification will be used for the purchasing of a three phase meter testing system in City Power which shall be capable of testing a minimum of 10 (ten) meters at a time. This will facilitate standardisation of calibration stations throughout City Power.

2 NORMATIVE REFERENCES

The following documents contain provisions that, through reference in the text, constitute requirements of this specification. At the time of publication, the editions indicated were valid. All standards and specifications are subject to revision, and parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents listed below.

SANS 474: Code of practice for electricity metering.

SANS 62051: Electricity metering – Glossary of terms

SANS 62052: Electricity metering equipment (2.C.) – General requirements, tests and test conditions part 1: metering equipment

SANS 62053 – 11: Electricity metering equipment (a.c.) – Particular requirement part 11: Electromechanical meters for active energy (classes 0.5,1 and 2)

SANS 62053 – 21: Electricity metering equipment (a.c.) – Particular requirements – part 21: Static meters for active energy (classes 1 and 2)

SANS 62053 – 22: Electricity metering equipment (a.c.) - Particular requirements- part 22: Static meters for active energy (classes 0.2S and 0.5S)

SANS 62053 – 23: Electricity metering equipment (a.c.) – Particular requirement – part 23: Static meters for reactive energy (classes 2 and 3).

3 DEFINITIONS AND ABBREVIATIONS

The definitions and abbreviations in the above documents shall apply to this specification.

4 REQUIREMENTS

4.1 General

4.1.1 The three phase meter test bench for the calibration and verification shall be fully automatic and

shall have the capability to test both single and three phase whole current meters up to 160A as well as current transformer operated meters both at 1A and 5A.

4.1.2 The generation of voltage, phase shift and current shall be fully electronic, computer controlled and independently adjustable.

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 4 OF 15

4.1.3 The meter test bench station shall be capable of carrying out multiple load-points test in sequence.

4.1.4 The meter test bench station shall also be capable of doing the individual tests, selected by the operator from the computer screen menu.

4.1.5 The meter test bench station shall test up to a minimum of 10 meters at a time, electromechanical, or electronic type for active and reactive energy.

4.1.6 The meter test bench station shall have an emergency isolation button and a separate main switch

4.1.7 The three phase standard shall be a class 0.02% for active energy and 0.05% for reactive energy with direct current input for whole current measurements of up to 160A.

4.1.8 Apart from the normal measurement quantities offered, the device shall have Volt ampere reactive hour (Varh) measurements capability which is selected to comply with the new IEC standard. This enables Varh of the fundamental values or the fundamental values plus the harmonic values.

4.2 Sources

Voltage Amplifier The voltage amplifier shall provide several voltage ranges to ensure suitable load conditions and accuracy. Furthermore it shall conform to the requirements stated in the table below:

Parameter Value

1. Voltage range 30 V to 300 V (Phase to Neutral)

2. Setting resolution 0,1 V

3. Accuracy of amplitude ± 0,1 % of the set value

4. Stability (SI) <100 x 10-6 (with T = 60 s, N = 10)

<500 x 10-6 (with T = 5 s, N = 24)

5. Distortion factor at linear load < 0,5 %

6. Maximum DC voltage permitted < 0,2 % of voltage output

7. Minimum output power per position 60 VA r.m.s at the high end of the voltage range and at resistive loads

8. Protection The output circuit shall be protected against short circuit and overload

Table 1

Current Amplifier The current amplifier shall provide several voltage ranges to ensure suitable load conditions and accuracy. Furthermore it shall the requirements stated in the table, below:

Parameter Value

1. Current range 1 mA to 160 A

2. Setting resolution 0.1 mA to 10 mA (depending on range)

3. Accuracy of current amplitude ±1,0 % (1 mA ≤ I <10 mA)

± 0,5% (10 mA ≤ I < 50 mA)

± 0,1% (50 mA.≤ I < 160 A)

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 5 OF 15

4.Stability (S) of current amplitude < 100 x 10-6 (with T = 60 s, N = 10)

< 500 x 10-6 (with T = 5 s, N = 24)

for I > 50 mA

5.Distortion factor at linear load < 0,5 %

6.Maximum permitted DC current <0,1 % of current output

7.Maximum output per meter test position 60 VA r.m.s at the high end of the voltage range and at resistive loads

8.Protection The output circuit shall be protected against short circuit and overload

Table 2

Phase angle The following phase angle setting requirements shall apply to both current and voltage amplifiers:

Parameter Value

1. Phase angle range 0 ° to 360 °

2. Setting resolution 0,01 °

3. Stability (Sabs) of the angle setting 0.05 (with T = 60 s, N = 10)

4. Accuracy of setting ± 0.05 °

Table 3

Frequency The following frequency setting requirements shall apply to both current and voltage amplifiers:

Parameter Value

1. Phase angle frequency 40 Hz to 70 Hz

2. Setting resolution 0,01 Hz

3. Stability (Sabs) of the angle setting 0.02 (with T = 60 s, N = 10)

4. Accuracy of setting ± 0.02 %

Table 4

Harmonics

The voltage and current amplifiers shall be capable of superimposing harmonics on their output signals, in accordance with the following setting requirements:

Parameters Value

1. Harmonic range 2nd to 1313th

2. Amplitude of harmonics in percentage with respect to the fundamental frequency amplitude

0 % to 40 % for 2nd to 5th harmonic

0% to 15 % for 6th to 7th harmonic

0% to 10 % for 8th to 13th harmonic

The peak value of the superimposed current or voltage may not exceed 1,4 Imax resp. 1,4 Umax

3. Setting resolution Maximum 1 % of fundamental frequency amplitude

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 6 OF 15

4. Phase angle with respect to fundamental frequency

0 ° to 180 °

5. Accuracy of setting Amplitude: 1%

Phase angle: 1 ° related to fundamental

Table 5

4.3 Reference/Working standard

The working standard shall be capable of performing single- and three-phase measurements with an accuracy of 0.02% for active energy and 0.05% for reactive energy. Apart from the normal measurement quantities offered, the device shall have varh measurements capability which is selectable between fundamental and harmonic inputs. This enables varh measurements where the referenced standard measures the varh of the fundamental values or the fundamental values plus the harmonic values. The working standard shall be easily detachable from MTS to facilitate its calibration. The following requirements shall apply to the working standard:

Parameter Value

1. Voltage measuring range 30 V to 300 V

2. Current measuring range 1 mA to 160 A

3. Frequency measuring range 45 Hz to 65 Hz

4. Minimum frequency bandwidth Up to 1260 Hz (21st harmonic of 60 Hz)

5. Measurement mode for single phase meters

1 phase 2 wire active / reactive

6. Measurement mode for three phase meters

1 phase 2 wire active / reactive

3 phase 4 wire active / reactive

3 phase 3 wire active / reactive

7. Frequency output The standard meter shall provide a power proportional frequency output for calibration and measuring purposes

8. Interface The standard meter shall have interface(s) for communication and control

Table 6

4.4 Magnetic induction of the MTS

The magnetic induction produced by the MTS at each position of the meter(s) under test shall not exceed the following values: For I ≤ 10 A B ≤ 0,0025 mT; For I > 10 A B ≤ 0,00025 mT * (I/A) Where: I - is the output current of the MTU; B - is the magnetic induction in air due to the 848 magnetic field (B = μ0H).

4.5 Scanning heads

The following requirements shall apply to the scanning heads:

Parameter Value

1. Receiver diode

Capable of sensing optical output according to IEC 62052-11 clause 5.11.1 and 5.11.2

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 7 OF 15

2. Distance to the LED of the DUT >10 mm (If the LED of the DUT radiates maximum strength specified in IEC 62052-11, i.e. 1000 µW/cm2, the minimum distance increases to 45 mm)

3. Minimum impulse length 100 µs for LED sensing

4. Distance to rotor disk Up to 45 mm-

Table 7

4.6 Meter Testing System (MTS)

4.6.1 The wiring layout and cross sections of the meter mounting system shall be suitably selected

in order to minimize voltage drop, power losses, magnetic induction and capacitive

interference.

4.6.2 The wiring shall ensure that the accuracy requirements and the reference test conditions are

met at each meter test position.

4.6.3 The meter testing system shall accommodate a minimum of 10 UUTs, together with the

scanning heads, error calculation and display units, and, when required, secondary voltage

transformers (MSVT) and / or isolated current transformers (ICT) for each Unit Under test

(UUT) position.

4.6.4 All cables shall be included to test CT connected meters and 160 A whole current meters.

4.6.5 The MTS shall have a minimum of10 x electronically compensated Isolation Current

Transformers with an accuracy of 0.05%

4.6.6 The MTS shall have 10 x local Error Indicators, one each per meter test position. The MTS

shall indicate the error of the individual meters while being calibrated. These errors shall be

downloaded into a system database for archiving and/or report printing.

4.6.7 The MTS shall allow for the meters to be programmed from the central PC via communication

links to each meter.

4.6.8 The MTS must be able to accommodate mounting of Power rail energy meters.

4.7 System Software

4.7.1 The software shall be clearly identifiable by the program name, version number, checksum or

digital signature and target operating system as applicable.

4.7.2 The test software shall allow generating and storing test programs, with proper identifiers. It

shall be possible to adapt the programs to different meter types, nominal values and ranges of

current and voltage, and test purposes such as type test, calibration, sampling inspection,

initial verification etc.

4.7.3 Error compensation - The program shall allow, as agreed and authorized by Accreditation

Bodies, the compensation of the errors of the MTU and its components (i.e. standard meters,

MSVTs, ICTs, etc.)

4.7.4 Execution of test programs:

the program shall allow automatic or step-by-step execution of test programs;

it shall control, display and log the test parameters, such as connection mode, voltages, currents, frequency, phase angles, power factor, power, energy;

the program shall be able to send defined data and commands to the meter, as well as to receive and safely store data from the meter using the communication protocol and security features specified;

it shall also allow to give instructions to the operator and accept commands and parameters from duly authorized operators at specified points during the execution of the program;

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 8 OF 15

the program shall monitor the operation of the MTU during execution of the program and if parameters are outside acceptable limits, give a warning sign or alarm and /or abort the program as appropriate;

the program shall provide information on its status, for example “Initialisation”, “Measurement running”, “Waiting for input from operator”, “Aborted”, Finished” etc.

4.7.5 The program shall automatically calculate the errors; evaluate the results of the tests for each

test points, for each meter position, and for defined meter lots. It shall display and print the

results and store them safely and with proper identifiers for further processing.

4.7.6 The Application Server shall host the application but the database shall reside on a central

database hosted inside the data centre for the storage of results, reporting purposes.

4.7.7 The system shall have a multi-level password protection to prevent unauthorized access.

4.7.8 The system shall be capable of capturing meter serial numbers through barcode scanning

terminal and manually via the keyboard. It shall also be possible to enter meter specific data

(e.g. meter constants)

4.7.9 The system shall be capable of displaying on the monitor the voltage, current and phase angle

parameters for tests/steps under execution.

4.7.10 The Application shall be compatible with a virtual environment and be configured on a server

that will be hosted in the Data Centre. The clients must access the Application through the use

of a client on their desktops/laptops or central Desktop for use with the test bench.

4.7.11 The software shall perform hardware supervision. Any malfunctions and faults of hardware

components shall be detected in order to prevent incorrect meter calibrations or test results.

4.7.12 All data received from the measuring hardware shall be checked for plausibility and

consistency. A warning or hint message shall be given to the operator in case of implausible

or inconsistent results.

4.7.13 If some measurements cannot be completed, this shall not lead to program interruptions or

malfunctions as far as this is feasible. Incomplete measurements shall not be evaluated, or if

they are evaluated, then they shall be marked unambiguously. They shall not affect the

presentation and storage of the results of other measurements, or if those measurements are

affected by any way, they shall be marked unambiguously.

4.7.14 The system should have Password management that adheres to or be in line with City

Power’s IT Security Policy

4.7.15 Application logs must be enabled 24 hours and 7 days per week and kept for an agreed

period.

4.7.16 The Service Provider can advise on other security parameters for their solution.

4.7.17 Documentation

The software of the MTU shall be properly documented and accompanied with operating

instructions delivered on a suitable storage media (paper or digital data storage devices). It

shall be written in clear and unequivocal terms and in consistent form.

Up-to-date software documentation shall be provided by the MTS manufacturer for every

version of the test software delivered to City Power.

The test software documentation shall at least include:

the test software name;

the software version and release date;

the author of the program;

contact details of the organization / person providing support;

explanation of all functions and operator commands;

description of test sequences;

description of parameter tables;

comprehensive description of all calculation formulae used for calculating the results;

list of error messages, diagnostic information and hints for troubleshooting;

description of all display screens, printout and storage formats

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 9 OF 15

4.8 Hardware requirements

4.8.1 The hardware where the test software runs and resides shall be a commodity desktop computer (PC) supplied with a widescreen monitor, keyboard and mouse.

4.8.2 The PC shall host the test software and database software capable of storing and archiving test results.

4.8.3 The PC shall have sufficient processing, memory and storage to be able to operate without any performance issues.

4.8.4 The PC’s storage capabilities shall be sized to store results for at least 10 years.

4.9 Technical support

The system shall be supplied fully installed and commissioned and come with a 3 (three) year service plan. The MTS manufacturer/supplier shall provide comprehensive training on the installed MTS all meter calibration staff. As part of the training the MTS manufacturer/supplier shall provide comprehensive training materials, including, but not limited to, user manuals and power point slides of all topics covered in the training. The supplier shall be able to support the MTS, by providing, at least, the following:

Telephonic assistance;

Spares and installation thereof;

Relevant services, such as system firmware updates, repairs, etc.

5 Training

a) The supplier shall provide comprehensive training courses to enable City Power to configure

the meter test bench.

b) Training shall be provided at no cost to City Power.

c) The language medium for the training courses shall be in English.

d) Training manuals for the meter test bench shall be provided.

e) If training is to take place outside City Power, the cost shall be for the suppliers account.

6 Quality Assurance

A quality management system shall be set up in order to assure the quality of the three phase meter bench station during design, development, production, installation and maintenance. Guidance on the requirements for a quality management system may be found in the following standards: SANS (or SABS ISO) 9000, 9001 and 9004. The details shall be subject to agreement between the purchaser and supplier.

7 Environmental Management

An environmental management plan shall be set up in order to assure the proper environmental management of the three phase meter bench station throughout its entire life cycle (i.e. during design, development, production, installation, operation and maintenance, decommissioning and disposal phases). Guidance on the requirements for an environmental management system may be found in ISO 14001 standards. The details shall be subject to agreement between City Power and the Supplier. This is to ensure that the asset created conforms to environmental standards and City Power SHEQ Policy.

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 10 OF 15

Annex A - Bibliography

ESKOM STANDARD FOR AUTOMATED STATIONARY ELECTRICITY METER TESTING SYSTEMS

240-48133938

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 11 OF 15

Annex B – Revision information

DATE REV. NO. NOTES

August 2014

0

First issue

June 2017 1 General editing, adding of new tables 4.2, 4.3, 4.5, revised technical schedules

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 12 OF 15

Annex C - Technical schedules A and B

Schedule A: Purchaser's specific requirements Schedule B: Guarantees and technical particulars of equipment offered

Item Sub clause

of CP_TSSPEC_215

Description Schedule A Schedule B

1 Name of the manufacturer xxxx

2 Place of manufacture xxxx

3 4.1.6 Does it have an emergency stop button?

Required

4 4.1.5 Does it have a separate main switch?

Required

5 4.2.1 Does the meter test

bench station shall test up to a minimum of 10 meters at a time, electromechanical, or electronic type for active and reactive energy?

Required

Voltage Amplifier:

Parameter Value

6 4.2 Voltage Source rating V 30 to 300

7 4.2 Setting resolution V 0.1

8 4.2 Accuracy of amplitude % ± 0.1

9 4.2 Stability See table 1 Point 4 Table 1 No.4

10 4.2 Distortion factor at linear load % < 0.5

11 4.2 Maximum DC voltage permitted % <0.2

12 4.2 Minimum output power per position

VA r.m.s. at the high end of the voltage range and resistive loads

60

13 4.2

Protection The output circuit shall be protected against short circuit and overload

Required

Current Amplifier:

Parameter Value

14 4.2 Current range mA to A 1 to 160

15 4.2 Setting resolution 1 mA 0.1 to 10

16 4.2 Accuracy of current amplitude See table 2, number 3 Table 2, No.3

17 4.2 Stability (S) of current amplitude See table 2, number 4 Table 2, No.4

18 4.2 Distortion factor at linear load % <0.5

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 13 OF 15

19 4.2 Maximum permitted DC current % of current output <0.1

20 4.2 Maximum output per meter test position

VA r.m.s at the high end of the voltage range and at resistive

loads

60

21

4.2

Protection

The output circuit shall be protected against short circuit and overload

Required

Phase Angle:

Parameter Value

22 4.2 Phase angle range ° 0 to 360

23 4.2 Setting resolution ° 0.01

24 4.2 Stability (Sabs) of the angle setting

° (with T = 60 s, N = 10) 0.05

25 4.2 Accuracy of setting ° ± 0.05

Frequency:

Parameter Value

26 4.2 Phase angle frequency Hz 40 to 70

27 4.2 Setting resolution Hz 0,01

28 4.2 Stability (Sabs) of the angle setting

% (with T = 60 s, N = 10) 0.02

29 4.2 Accuracy of setting % ± 0.02

Harmonics:

Parameter Value

30 4.2 Harmonic range nd to 13th 2 to 13

31 4.2 Amplitude of harmonics in percentage with respect to the fundamental frequency amplitude

See table 5, number 2 Table 5, No.2

32 4.2 Setting resolution Maximum % of fundamental frequency amplitude

1

33 4.2 Phase angle with respect to fundamental frequency

° 0 to 180

34

4.2 Accuracy of setting Amplitude: %

Phase angle: ° related to fundamental

1

1

Reference /Working standard:

Parameter Value

35 4.3 Voltage measuring range V 30 to 300

36 4.3 Current measuring range mA to A 1 to 160

37 4.3 Frequency measuring range Hz 45 to 65

38 4.3 Minimum frequency bandwidth See table 6, number 4 Up to 1260 Hz

39 4.3 Measurement mode for single phase meters

1 phase 2 wire active / reactive Required

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 14 OF 15

40 4.3 Measurement mode for three phase meters

1 phase 2 wire active / reactive

3 phase 4 wire active / reactive

3 phase 3 wire active / reactive

Required

41 4.3 Frequency output The standard meter shall provide a power proportional frequency output for calibration and measuring purposes

Required

42 4.3 Interface The standard meter shall have interface(s) for communication and control

Required

Scanning heads:

Parameter Value

43 4.5 Receiver diode

Capable of sensing optical output according to IEC 62052-11 clause 5.11.1 and 5.11.2

Required

44 4.5 Distance to the LED of the DUT

>10 mm (If the LED of the DUT radiates maximum strength specified in IEC 62052-11, i.e. 1000 µW/cm2, the minimum distance increases to 45 mm)

Required

45 4.5 Minimum impulse length µs for LED sensing 100

46 4.5 Distance to rotor disk mm Up to 45

NOTE: TICKS [], ASTERISK [*], WORD [NOTED], OR TBA [TO BE ADVISED] SHALL NOT BE ACCEPTED.

Tender Number: _________________________________________________________________

Tenderer’s Authorised Signatory: _________________________________________________

Name in block letters Signature

Full name of company: _____________________________________________________________

SPECIFICATION FORTHREE PHASE METER TEST BENCH STATION

REFERENCE REV

CP_TSSPEC_215 1

PAGE 15 OF 15

Technical schedules A and B

Deviation schedule

Any deviations offered to this specification shall be listed below with reasons for deviation. In addition, evidence shall be provided that the proposed deviation will at least be more cost-effective than that specified by City Power.

Item Subclause of CP_TSSPEC_215

Proposed deviation

Tender Number: _________________________________________________________________

Tenderer’s Authorised Signatory: ___________________________________________________

Name in block letters Signature

Full name of company: _____________________________________________________________