12/22/10

Bharat Heavy Electricals Limited Bhopal

TRE BLOCK-3 EASTERN ANNEXE, BHEL, PIPLANI, BHOPAL 462021

Page 1 of 3

Transformer Engineering Department

Sub: Submission of Customer Drawings for 340 MVA 420/16.5 kV 3 Phase Generator transformer

for M/S Abhijit Infra Ltd. (AINL) against WO 69071-Q-512-01 & 60036-Q-512-01

Dear Sir,

With reference to subject please find enclosed herewith the 3 sets of the following drawings/documents for

further submission to Customer/PEM/DCPL

Sl. No. Description Drawing No. Rev.No.

1 OGA 34600000717 01

2 OGA Part List 34600000718 01

3 Foundation Plan 34600000719 01

4 HV Bushing 34600000720 00

5 LV Bushing 34600000721 00

6 HV Neutral Bushing 34600000722 00

7 Bus Duct Mounting flange details 34600000724 00

8 320 Dia Twin Bi Directional Roller 34600000723 00

9 Shipping Diagram 34600000725 00

10 Rating & Diagram Plate 34600000726 00

11 Valve Schedule Plate 34600000727 00

12 Technical Data Sheet TRE/69071/GTP 01

13 Customer Inspection Test Schedule TRE/69071/CITS 00

Please also note that the Sl. No. 1-3 has been revised as per customer comments dtd: 23.11.10.

Our point wise reply is as below:

Sl. No. Customer point BHEL Reply

1 Provide necessary Shut off valves for

detachable cooler units

Indicated as item no. 123

2 Confirm that all valves are made of Gun Metal. Please note that valves upto 50 NB

shall be of Gun metal. All valves

above 50 NB shall be of Cast steel

with Gun metal fittings. This is our

standard practice and followed for all

projects of NTPC/POWERGRID and

also the earlier supplies to JINDAL.

3 Confirm that all gasketed joints are with earth

continuity through copper strips.

Please note that the Copper strips are

provided at Tank, turret joints etc.

Other joints get the earth continuity

through nut-bolts etc.

Our Ref: TRE/69071/GKL

Date- 22-12-2010

Shri P.K Sharma

CMG

12/22/10

Bharat Heavy Electricals Limited Bhopal

TRE BLOCK-3 EASTERN ANNEXE, BHEL, PIPLANI, BHOPAL 462021

Page 2 of 3

This is our standard practice and

followed for all projects of

NTPC/POWERGRID and also the

earlier supplies to JINDAL.

4 Confirm that all drain valves shall be with

threaded adopter.

We have provided two nos. sampling

valves at Top & Bottom with

threaded adopter.(Item no. 25 & 25a)

5 Indicate the size of Earthing Connection for

item no. ‘212a” and “110”.

Indicated in the revised OGA

drawing(Sht-03)

6 Indicate “Transformer Marshalling Box”. Indicated as item no. 34

7 Item no. “181” (HV Terminal Connector) shall

be suitable for TWIN Moose ACSR.

Confirmed. Please confirm that the

conductor spacing shall be 450mm.

8 Provide Pressure Relief device with trip contact. Confirmed

9 Confirm Explosion Vent shall be double

diaphragm type.

Please note that Explosion vent is

not applicable as PRV is provided.

10 Correct the Name of the Project. -

11 Indicate breather. Indicated as item no. 17

12 Submit other drawings as listed. Submitted as per list above

13 Direction of Transformer Withdrawal will be

opposite left hand side to Cooling Bank. Change

the foundation plan accordingly.

Indicated in revised Foundation plan

drawing.

14 Indicate item no. “007”: Pump Support on

foundation plan.

Indicated in revised Foundation plan

drawing.

15 Indicate “Oil Filling Instruction Plate” on OGA

Part List.

Indicated in revised OGA and OGA

Part list

The Technical data sheet has been revised as per Customer comments dtd 05.08.10. Please find below the

point wise reply for your comments on GTP.

Sl.

No.

Customer point BHEL Reply

1 Transformer rated out put for ONAN as well as ONAF Not applicable with OFAF type

unit coolers.

2 Winding insulation level with impulse and power frequency Indicated in Cl.5.1.

3 No load current referred to HV (%) Indicated in Cl. 10.1 to 10.5

4 Rated voltage of tap changer Indicated in Cl.18.3

5 BHEL shall specify no of cooling units required for full load

operation

Indicated in Cl.14.8

6 For secondary resistance (5 ohms) in the CT data sheet shall

be rechecked

It may please be noted that CT

secondary resistance is indicated

as per Customer Specification

Annexure E.

Other drawings are fresh submission for customer approval.

Please arrange the approval of the above drawings/documents at the earliest.

12/22/10

Bharat Heavy Electricals Limited Bhopal

TRE BLOCK-3 EASTERN ANNEXE, BHEL, PIPLANI, BHOPAL 462021

Page 3 of 3

G.LALWANI

DY.MGR (TRE)

Cc:

1. Shri.R. Shukla, DGM (TRS) C:\USR\gkl\1WO\340_69071_Abhijit\Corr\Sub_Dwg_00_221210.doc