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.
Sl
No
Title of Document File name
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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Report 2
Subsequent to submission of Review of Relay Coordination Analysis Report the following documents
were made available for review
Sl
No
Title of Document File name
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.
Revision 1 dated 28.07.10
Pdf document file :
RC Study for GENERATOR
3 RELAY COORDINATION ANALYSIS REPORTS - 11 /
0.415kV SYSTEMARCAPITA HEADQUARTERS
Manama, Bahrain.
Revision 2 dated 18.01.10
Pdf document file :
RELAY AND CB SETTINGS CALCULATION
4 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-
ESSENTIAL, DWG NO.4342/E/303.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
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
ESSENTIAL, DWG NO.4342/E/302.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :Short-Circuit Study fault at 400V Load Bus
(MCC-B6)
6 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV Pdf document file :
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SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-
ESSENTIAL, DWG NO.4342/E/303.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Short-Circuit Study fault at 400V Load Bus
(MCC-N63E)
7 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-NON
ESSENTIAL, DWG NO.4342/E/302.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :
Short-Circuit Study fault at 400V Load Bus
(MCC-S61)
8 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-NON
ESSENTIAL, DWG NO.4342/E/302.)
ARCAPITA HEADQUARTERS.MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :
Short-Circuit Study fault at 400V Main Bus
(LVP-B-1)
9 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-NON
ESSENTIAL, DWG NO.4342/E/302.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :
Short-Circuit Study fault at 400V Main Bus
(LVP-B-2)
10 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEMELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-
ESSENTIAL, DWG NO.4342/E/303.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :
Short-Circuit Study fault at 400V Main Bus
(LVP-B-3-E)
11 SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV
SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM (LV SYSTEM-
ESSENTIAL, DWG NO.4342/E/303.)
ARCAPITA HEADQUARTERS.
MANAMA, BAHRAIN.
Revision 1 dated 27.11.09
Pdf document file :
Short-Circuit Study fault at 400V Main Bus
(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
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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)
SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM
(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
6 Short-Circuit Study fault at 400V Load Bus (MCC-N63E)
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
7Short-Circuit Study fault at 400V Load Bus (MCC-S61) SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM
(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
8 Short-Circuit Study fault at 400V Main Bus (LVP-B-1)
SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM
(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)
SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM
(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
10Short-Circuit Study fault at 400V Main Bus (LVP-B-3-E)
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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11 Short-Circuit Study fault at 400V Main Bus (LVP-B-4-E)
SHORT CIRCUIT ANALYSIS REPORT - 11 / 0.4kV SYSTEM
ELECTRICAL SCHEMATIC DIAGRAM
(LV SYSTEM- ESSENTIAL, DWG NO.4342/E/303.) 11 The reference bus, device details should match with main Single line diagram. Otherwise
this Report is in Order
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.
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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.
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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
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