11kv schemes 24th-25th april 2013

7/27/2019 11kv Schemes 24th-25th April 2013

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Sl.

No:Drawing No. RPCL/Steag Comments BHEL Reply

1 35210078623-Sht 02Correct the CT Neutral formation in the GRP

differential relay connections.

Noted & incorporated.

2 35210078623-Sht 03Correct the CT Neutral formation in the GRP

REF relay connections.


3 35210078623-Sht 04Clarify the P1 philosophy P1 is always on the breaker side irrespective of power flow

direction.

4 35210078623-Sht 04Output contacts does not match with the

typical functions in relay catalogue.


5 35210078623-Sht 07Interlocks to other panels to be taken care of

in respective drawings.


6 35210078623-Sht 08Breaker in test,service,local,remote to ddcmis Noted & incorporated.

7 35210078623-Sht 14Correct the I/O list in all schemes to be revised. Noted & incorporated.

8 35210078624-Sht 08 86X contactor in incomer & Tie Feeder Noted & incorporated.

9 35210078624A-Sht 01

10 35210078625-Sht 01Wherever MCBs are given to be replaced with

fuse.


11 35210078626-Sht 01

12 35210078627-Sht 01

13 35210078628-Sht 01

14 35210078629-Sht 01

15 35210078630-Sht 01

16 35210078631-Sht 01

17 35210078632-Sht 01

18 35210078633-Sht 01

19 35210078634-Sht 01

20 35210078635-Sht 09

21 35210078636-Sht 09

22 35210078637-Sht 09

23 35210078637A-Sht 09

24 35210078638-Sht 10 Rename 27/27N/2M as 27/27N/2

BHEL REPLY DATED 25/04/2013 RPCL/STEAG COMMENTS ON 11kV SCHMATIC DRAWING REV 02


2/14

reply to be given for output contact rating


3/14

Sl. No: Drawing No. RPCL/Steag Comments BHEL Reply

1 35210078623-Sht 01

Schematic drawing shall be confirmed to logic

diagram of 11Kv switchgear & shall bementioned in the drawing

Drawing revised in line with revised 11kv

Logic diagram. Reference drawing no. of SLD& Logic shall be incorporated in revised/as

manufactured drawings

2 35210078623-Sht 01Furnish legend details Legend of devices submitted.

3 35210078623-Sht 01

Furnish BOM As per MOM Dtd 16-17th Nov'2012 pt 13

BOM shall be furnishede 3 weeks before

inspection.

4 35210078623-Sht 01Panel number mentioned here is not matched

with SLD

Drawing revised to incorporate the comment.

5 35210078623-Sht 01

The closing & tripping logic shall be hardwiredcontrol from ECP & DDCMIS seperately.

Remote closing /tripping shall be wired as

agreed in MOM dtd 4-6th june 2012.


6 35210078623-Sht 01Furnish CT & PT details in this drawing also for

easy reference.


7 35210078623-Sht 01

Furnish Numerical Relay connection diagram

for SEL 751A & 2505 indicating P.S , I/O Ports ,

CT/PT connections & communication ports.

Relay catalogue soft copy shall be sent by

15.02.2013.

8 35210078623-Sht 01

Furnish VCB breaker contact development

diagram indicating 94, 52a/b,33SC contact

configuration.

Shall be incorporated in revised/as

manufactured drawings.

9 35210078623-Sht 01Furnish OGA of VCB & details of FEB & BEB OGA of VCB & FEB/BEB Scheme submitted.

BHEL REPLY TO RPCL/STEAG COMMENTS ON 11kV SCHMATIC DRAWING Rev 00


4/14

10 35210078623-Sht 01

Indicate reference drawings Shall be incorporated in revised drawings.

11 35210078623-Sht 02

Since the relay manufacturer is not indicated in

the keydiagram, calculations for the burden &

knee point voltage shall be provided.

Shall be furnished as agreed.

12 35210078623-Sht 02Note: Shorting links are to be removed when

CTs are connected in GRP circuit.


13 35210078623-Sht 04

R ,Y B Phase shall be shown It may please be noted that Bus PT voltage is

not required in IF scheme, as it requires only

line voltage, which is provided by Line PT

signals as shown in the scheme.Earlier it was

shown inadvertently & hence it has been

removed.

14 35210078623-Sht 042-50 LBB function shall be indicated Drawing revised to incorporate the comment.

15 35210078623-Sht 05

Indicate what are the parameters shown at

MFTD output.Furnish details of MFTD.

MFTD is Multifunction Transducer which

provides analog signals which can measure

active, reactive power & energy at ECP.

16 35210078623-Sht 05Digital multi function meter Drawing revised to incorporate the comment.

17 35210078623-Sht 05

Watt transducer indicated in SLD to be shown Multifunction transducer provided instead of

watt transducer which provides watt output

alongwith other analog signals.

18 35210078623-Sht 05 Current y phase shall be indicated. To be indicated in revised drawings.

19 35210078623-Sht 06

DC supply supervision 80D aux Contactor used for DC supply

supervision.Description will be indicated in

revised drawings.


5/14

20 35210078623-Sht 06

240VAC shall be derived from 415/240 VAC

aux. transformer of adequate rating so as to

have fault isolation on sec side.

It may be noted that the 415V AC supply is

being fed from AC distribution SWBD. In case

of any short circuit, fuses at the AC

distribution SWBD shall be blown protecting

the bus.Also as the supply is taken from 1

phase & neutral alternately it will prevent theunbalance of current in a single phase.

21 35210078623-Sht 07

What is future interlock for FEB & BEB This future interlock is provided for any

interlock to be used in future at later stage.

22 35210078623-Sht 07Furnish FEB/BEB Scheme Scheme submitted

23 35210078623-Sht 07 Furnish the logic for this where it is derived Drawing revised to incorporate the comment.

24 35210078623-Sht 0786 not operated shall be taken for test closing

circuit


25 35210078623-Sht 08Furnish the details of planned logic where it is

derived

Planned Logic is derived in numerical relay &

the same has been furnished.

26 35210078623-Sht 0950LBB function of relay shall be indiacted. Drawing revised to incorporate the comment.

27 35210078623-Sht 09

LBB aux relay shall be provided for contact

multiplication & use.

LBB function is part of the numerical relay as

mentioned in SLD. If required numerical relay

contacts can be programmed.

28 35210078623-Sht 11Breaker in Service indication shall be Amber Drawing revised to incorporate the comment.

29 35210078623-Sht 11Provide indicating lamp for closing circuit

healthy indication


30 35210078623-Sht 1252a/b contacts not shown in sheet 07. Shall be incorporated in revised/as

manufactured drawings.


6/14

31 35210078623-Sht 12Indicate service description of all the contacts

shown


32 35210078623-Sht 12Closing circuit unhealthy to DDCMIS Drawing will be revised to incorporate the

comment.

33 35210078623-Sht 12Breaker spring charged to DDCMIS Drawing revised to incorporate the comment.

34 35210078623-Sht 12

Feeder/ Bus earthed contacts to DDCMIS. 75FET contacts are given to upstream breaker

circuit for tripping the upstream breaker

during Feeder earthing. However, it is not

possible to provide feeder/Bus earthed

contacts to DDCMIS as no electrical interlocks

can be provided for the same.

35 35210078623-Sht 13

LBB opearted contacts for alarm/ DCS & spare ,

to wire to Bus under voltage master trip relay

& for tie breaker Trip

Drawing will be revised to incorporate the

comment.

36 35210078623-Sht 14Indicate what are the indications provided on

relay front

Shall be incorporated in revised drawings.

37 35210078626-Sht 03

As per SLD time delayed no voltage protection

shall be provided.

Time delayed no voltage protection feature is

present in the numerical relay provided.

38 35210078626-Sht 05Indicate the parameters displayed in MFM Drawing revised to incorporate the comment.

39 35210078626-Sht 05

Ammeter & watt meter transducer shall be

provided to monitor the parameters at ECP

No meters on ECP.Ammeter & Multifunction

transducer provided


with SLD


41 35210078627-Sht 01Also refer comments marked in IF type 1 from

unit incomer



unit incomer



unit incomer



7/14


with SLD


45 35210078629-Sht 01Indicate services of OG Feeder Drawing revised to incorporate the comment.

46 35210078630-Sht 01Comments same as on 629 Drawing revised to incorporate the comment.

47 35210078630-Sht 02

Relay should be communicated to DDCMIS All numerical relays will be connected through

RS 485 port to the DDCMIS.Drawing will be

revised to incorporate the comment.

48 35210078630-Sht 03Relay should cover sensitive earth fault

protection by using CBCT as input

Function 50G will be shown in drawing

49 35210078630-Sht 04 Ammeter & transducer to be provided Already shown in drawing as TDI.

50 Indicate services Shall be incorporated in revised drawings.

51 Indicate logic diagram reference Shall be incorporated in revised drawings.

52Panel number mentioned here is not matched

with SLD


53Also refer comments marked in IF type 1 from

unit incomer


54 35210078632,33-Sht 02Relay should have sensitive earth fault

protection

Function 50G will be shown in drawing

55 35210078633-Sht 03Current to be displayed at ECP, necessary

transducer to be provided.

Ammeter transducer already provided in Y

phase.

56 35210078634-Sht 02Provide technical manual Technical manual to be sent by 15th feb 2013.

57 35210078634-Sht 03Ammeter transducer to be provided Ammeter transducer already provided in Y

phase.

58Panel number mentioned here is not matched

with SLD


59Also refer comments marked in IF type 1 from

unit incomer


35210078631,32,33,34-

Sht 01

35210078635,36,37,38-


8/14

60

As per SLD time delayed no voltage protection

shall be provided.

Time delayed no voltage protection feature is

present in the numerical relay provided.

RPCL STEAG BHEL


9/14

RPCL/Steag Comments

Noted

RPCL/Steag will review & furnish

comments, if any.

Noted

Noted

Discussed on Rev 01 drawings.

Noted

BHEL to include the numerical

relay diagram in the respective

schemes indicating all itscontacts & ports. BHEL agreed to

incorporate the same.

Same shall be indicated in the

revised drawings.BHEL agreed.


comments/approval.


10/14

Same shall be indicated in the

revised drawings.BHEL agreed.

Not yet furnished.BHEL to furnish

the same.

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted


11/14

Noted

RPCL/Steag requested BHEL to

furnish the write up on interlock

& functioning of FEB & BEB.

BHEL has agreed to furnish the

same.


comments/approval.

RPCL/Steag will review & furnishcomments, if any.

Noted


comments, if any.

Noted.

Noted.

Noted.

Noted.

Noted.


12/14

Noted.

Noted.

Noted.

Noted

Noted

Same to be indicated in the

drawing

Noted

Noted

Noted

Same as in Drg No: 35210078623




13/14

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Noted

Not recieved. BHEL furnished

soft copy.

Noted


comments/approval.


comments/approval.


14/14


comments/approval.

11kv schemes 24th-25th april 2013

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