Report 230910

8/8/2019 Report 230910

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Report 4

23/09/10

The final documents have been submitted for review on 23/09/10

Sl

No

Title of Document File name

1 ARCAPITA HEAD QUARTERS PROJECT MANAMA,

BEHRAIN

Word doc file :Arcapita summary.doc

2 ARCAPITA HEADQUARTERS PROJECT,

LOCATED IN MANAMA, BAHRAIN.

11/0.400KV SYSTEM

SHORT CIRCUIT AND RELAY COORDINATION

Pdf file: Arcapita hq -project (11-400 kV

system-r3)

I have gone through the report and I find certain corrections to be made ,and these are brought out as

under

1 Please refer page no:181.In the detailed relay setting report, the 50 DMT setting for the transformer

feeder to be 9.2 and not 0.92

2 Please refer page no 181. In the detailed relay setting report, the PT ratio indicated as

/100/root3.But in the drawing the PT shown 110/root3.Please check and correct.

3 Please refer page no 186. For Capacitor feeders PFC1 ~ PFC4 LT setting proposed 1.5.Check this and

correct

4 It is indicated in the summary that there is no relay for the Generator Incomer and it is by error

included in the SLD.The SLD to be corrected and as built drawing to be made and it should be

certified by the consultant.

Conclusion

Subject to attending the points indicated above and set the devices as per the report recommendations

the installation can be certified for operation.

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Report 3

Subsequent to submission of Review of Relay Coordination Analysis Report 2 following documents duly

corrected and edited were submitted to me for further evaluation.

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No


1 Reply for Observations from the Report Pdf file Reply to points Arcapita

2 ARCAPITA HEADQUARTERS PROJECT, LOCATED IN

MANAMA, BAHRAIN. 11/0.400KV SYSTEM

Pdf file Arcapita hq -project (11-400 kV

system)

We have through the report and replies given and we would like to offer comments on the submissions.

1 There was some error in my communications last time the TMS for 11kV incoming relay should have

been 0.04 and by typo error I had communicated as 0.24.I regret for the error. Due to this error the

curves were fouling which is not acceptable.

I am sending the complete setting details with curves both for phase current and ground current,

this can be followed

2 You had not furnished relay settings for the Generator Panel. I had noticed some relays indicated in

the SLD furnished to me. However you have furnished setting details for Generator ACBs.

3 Report presentation can be better.

Index can be furnished with more details.

Page numbers can be given.

Each section has got some running number, these can be correlated.There is no title for the report front page.

The report can be user friendly

4 In the report the formula used for calculating the tripping time t cannot be same since we had

recommended different IEC curves like Extreme inverse/Standard inverse, this can be corrected.

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8/8/2019 Report 230910


Report 2

Subsequent to submission of Review of Relay Coordination Analysis Report the following documents

were made available for review

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No


1 RELAY COORDINATION ANALYSIS REPORTS - 11 /

0.415kV SYSTEM

ELECTRICAL SCHEMATIC SHEET (LV SYSTEM-NON

ESSENTIAL, DWG NO.4342/E/302.)

ARCAPITA HEADQUARTERS

Manama, Bahrain.

Revision 2 dated 18.01.10

Pdf document file :

RC Study for 11kV EDD Panel up to 0.415kV

Main Panel (LVP-B-1) DB Loads

2 RELAY COORDINATION ANALYSIS REPORTS FOR

GENERATOR SYSTEM

ELECTRICAL SCHEMATIC SHEET (LV SYSTEM-

ESSENTIAL)

ARCAPITA HEADQUARTERS Manama, Bahrain.


Pdf document file :

RC Study for GENERATOR

3 RELAY COORDINATION ANALYSIS REPORTS - 11 /

0.415kV SYSTEMARCAPITA HEADQUARTERS

Manama, Bahrain.


Pdf document file :

RELAY AND CB SETTINGS CALCULATION

4 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV

SYSTEM

ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-


ARCAPITA HEADQUARTERS.

MANAMA, BAHRAIN.


Pdf document file :

Short-Circuit Study fault at 400V Load Bus

(MCC-B4E)

5 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kVSYSTEM

ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-NON



MANAMA, BAHRAIN.


Pdf document file :Short-Circuit Study fault at 400V Load Bus

(MCC-B6)

6 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV Pdf document file :

8/8/2019 Report 230910


SYSTEM




MANAMA, BAHRAIN.



(MCC-N63E)


SYSTEM




MANAMA, BAHRAIN.


Pdf document file :


(MCC-S61)


SYSTEM



ARCAPITA HEADQUARTERS.MANAMA, BAHRAIN.


Pdf document file :

Short-Circuit Study fault at 400V Main Bus

(LVP-B-1)


SYSTEM




MANAMA, BAHRAIN.


Pdf document file :


(LVP-B-2)


SYSTEMELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-



MANAMA, BAHRAIN.


Pdf document file :


(LVP-B-3-E)


SYSTEM




MANAMA, BAHRAIN.


Pdf document file :


(LVP-B-4-E)

12 Reply for Observations from the Report Word document file : Reply for the Report-

ARCAPITA-27-7-10

13 Pages 74 and 75 extract from Schneider electric

catalog on Switch-disconnectors protection

Pdf document file :

Merlin_Gerin_Circuit_breaker

14 Pages 30 to34 Extract from Schneider electric

technical particulars on SEPAM 1000 relay on

Pdf document file :sepam 1000

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protection

8/8/2019 Report 230910


We have gone through the above documents and our observations are brought hereunder document

wise

1 RC Study for 11kV EDD Panel up to 0.415kV Main Panel (LVP-B-1) DB Loads

RELAY COORDINATION ANALYSIS REPORTS - 11 / 0.415kV SYSTEM

ELECTRICAL SCHEMATIC SHEET

(LV SYSTEM-NON ESSENTIAL, DWG NO.4342/E/302.) 1 Instead of indicating some new names for the devices like BUS1,CB97,CB31 etc, it would be

advisable to follow the same names/labels appear in the SLD drawing 4342/E/302 rev 4 sheet 1

.like LVP-B-1 Bus ,Incomer ACB for TX-01etc .this will facilitate any one to easily identify the

device with reference to the report.

2 For the transformer of 1500 kVA,11 kV, the full load current is only 78 73 Amps, with allowing 10

% over load for the transformer it would be advisable to set the pickup current at 0.85 instead of

0.95

3 As already intimated the with existing settings of ACB and the Sepam Relay for the Transformer

TX01, there is over lapping of curves at some point and it is to be avoided. We recommend the

following settings

ACB:

LTPU:0.9

LT Delay Band:0.5

STPU ST pickup:6

STPU trip (A):13500

STPU Band:0

I2t=out

Inst Pickup:6

Inst Trip(A):15000

SEPAM 1000+ relay

Tap:0.85P.A.:85Amps

IEC Curve: Extremely inverse

TMS;0.24

Inst: 9.2

P.A: 920 A

Delay:0.1

4 Based on the above setting recommendations the incomer relay provided in the 11 kV Incomer

panel can be set as follows:

SEPAM 1000+ relay

Tap:0.85

P.A.:340AmpsIEC Curve: Standard Inverse time

TMS;0.24 should have been 0.04communication mistake

Inst: 2.25

P.A: 900 A

Delay:0.25

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5 Since the settings of EDD relay have already been fixed, we are not recommending any change.

However we recommend instantaneous setting to be added as follows for proper discrimination

Inst: 2.25

P.A: 900 A

Delay:0.4

6 On similar method the ground Fault settings can be reviewed

7 TCC curves have been shown for 11kV and 400 V separately. Single TCC is required for each

critical path starting from 11kV incoming to down stream

2RC Study for GENERATOR

RELAY COORDINATION ANALYSIS REPORTS FOR GENERATOR SYSTEM 1 Single line Reference drawing to be indicated2 In the report and Etap drawings device names should be same as that found in the Main

Single Line drawing3 There are two O/C and EF relays in the Generator control Panels, these relays are to be

configured and relay settings to be furnished. It is suggested to set Voltage RestrainedOver Current relay setting (51V) for the Generators4 Unable to link the Bus reference and CB reference with Main SLD.

5 There are other outgoings in the Generator CB panels, these devices to be set.

3 RELAY AND CB SETTINGS CALCULATION

RELAY COORDINATION ANALYSIS REPORTS - 11 / 0.415kV SYSTEM

1 Since TMS range for the relays are 0.05-4.25, this may be corrected in the report.

2 Setting details for all the feeders to be furnished. For some feeders in the Generator CB Panels 1 and

2 not furnished3 Setting details may be edited based on the revisions suggested

4 Short-Circuit Study fault at 400V Load Bus (MCC-B4E)

SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM

ELECTRICAL SCHEMATIC DIAGRAM

(LV SYSTEM- ESSENTIAL, DWG NO.4342/E/303.) 1 The reference bus, device details should match with main Single line diagram. Otherwise

this Report is in Order

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5 Short-Circuit Study fault at 400V Load Bus (MCC-B6)



(LV SYSTEM-NON ESSENTIAL, DWG NO.4342/E/302.) 1 The reference bus, device details should match with main Single line diagram. Otherwise


6 Short-Circuit Study fault at 400V Load Bus (MCC-N63E)


ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM- ESSENTIAL, DWG NO.4342/E/303.) 1 The reference bus, device details should match with main Single line diagram. Otherwise


7Short-Circuit Study fault at 400V Load Bus (MCC-S61) SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM




8 Short-Circuit Study fault at 400V Main Bus (LVP-B-1)



(LV SYSTEM-NON ESSENTIAL, DWG NO.4342/E/302.)

1 The reference bus, device details should match with main Single line diagram.

Otherwise this Report is in Order

9 Short-Circuit Study fault at 400V Main Bus (LVP-B-2)





10Short-Circuit Study fault at 400V Main Bus (LVP-B-3-E)





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11 Short-Circuit Study fault at 400V Main Bus (LVP-B-4-E)





General Observations

1 There are 11 documents giving Input data, short circuit report setting details, and

Calculations. These documents are to properly formed into single binder with project

details, index. 2 We suggest that in the TCC curves transformer characteristic curves be included.3 There should be separate TCC for utility feeding and Generator feeding. The paths to be

from upstream to downstream up to load.

Conclusion

Subject to attending the points indicated above and set the devices as per the report recommendations

the installation can be certified for operation.

8/8/2019 Report 230910


Review of Relay Coordination Analysis Report

We have been requested to evaluate the RELAY COORDINATION ANALYSIS REPORTS

Submitted by third party for Arcapita Headquarters Project, located in Manama, Bahrain.

Details of Project

Project: Arcapita Headquarters.

Location:Manama, Bahrain.

System: LV System (11/0.4kV).

Documents made available for Evaluation:

Relay and CB setting calculations

RC study for 11 kV EDD panel up to 0.415 main Panel (LVP-B-1) DB Loads

Reference Document:

Client Specifications VII-300.070

Client Specifications y71.1010

Requirement:

The reference document indicates what is expected out of the Report.

Briefly it says the Contractor to conduct the electrical Coordination study for the Installed Electrical

Distribution system at Arcapita Headquarters submit the Report

It also gives details of the study to be made as follows

y Conduct complete protection grading and setting calculation of the complete Electrical

Distribution System

y Carry out Short circuit calculations for the distribution system as indicated on the drawings

y Fault calculations and protective device study to be conducted with a suitable computer

programme

y To carry out the protective device co-ordination study including the following

Time-current co-ordination curves graphically indicating the proposed co-ordination

for the system on log-log graph transparencies.

8/8/2019 Report 230910


Observations from the Report

We have studied the report documents submitted and our Observations are as under:

1) Computer programme, Electrical design software ETAP

version 7 has been used andT

CCcurves have been generated

2) Setting details for relays and Air circuit breakers, MCCBs have been given.

3) There is no Short Circuit Current Report and calculations for different bus bars

4) The settings for relays and Circuit breakers are not coordinated properly there are mix up. The

curves generated based on the setting for Transformer primary side relay and LV side

ACB.Attached TCC will show you the mix up

5) In rush current of the Transformer has not been taken into account while setting the

Transformer incomer relay

6) Relay settings recommended are beyond the range of the relay. The SEPAM relay TMS setting

range is only 0.1 to 12.5 where as the settings proposed are 0.04 and 0.05

7) High set I> current and timing not recommended for the SEPAM Relays.

8) There should be time discrimination of minimum 150 mill seconds between 11 kV Incoming

Relay P OC1 and EDD P OC1relay.

9) All the outgoing MCCBs are to be set based on cable rating and not based on Load.

10) There is no Single Line diagram pertaining to the Electrical Distribution System included in the

Report

11) Generators have to be taken into account for instantaneous current setting of MCCBs as the

fault current generated by the Generators will be less compared to the utility. Therefore Short-

circuit currents have to be arrived at for both utility feeding and generator feeding. Lowest

between the two short circuit currents to be considered for setting.

12) Based on the short-circuit report the device(MCCB) short circuit rating have to be checked and

certified for interruption rating of MCCBs , ACBs and Busbars

13) Short circuit rating of NS630 MCCB is indicated as 94.5 kA, this has to be checked as the

technical data sheet for NS630 does not indicate this.

14) Similarly the short circuit rating indicated for NS160 MCCB to be checked and corrected.

15) The Interruption rating of 2500 Amps ACB also to be checked.

16) There is no over current setting proposed for the 2500 Amps ACBs

17)F

ault Level at theP

oint of supply is taken as 350 MVA

.T

his should be confirmed by the utilityprovider. One has to consider both max fault level and minimum fault level at the point of

supply and calculate the maximum fault current and minimum fault current.

18) Based on the Maximum fault current interrupting currents of various devices should be

verified.

19) Based on the minimum fault current the setting of devices to be set.

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Recommendations:

The report is not complete and has certain deficiencies as enumerated above. It is, therefore, our

recommendations to do fresh study and submit fresh report with setting details for relays, ACBs and

MCCBs

8/8/2019 Report 230910


Report 230910

Documents

Transcript of Report 230910