238507778 Clarification for DSLP Calculations Switch Yard Lighting Protection 1

8/10/2019 238507778 Clarification for DSLP Calculations Switch Yard Lighting Protection 1

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ETA

EMGlNEERlNG PRIVATE LIMITED

503-504, Prakash Deep Building,

7

Tolstoy

Marg,

New Delhi - 110001

Ph.

:

0 1

1-26451115/6/7/8,43743800,

41520840/43

Fax : 011-43743866,41520844

Ernail

:

[email protected]

Ref:

ETA/ICML/9MW/BC/SClKW035

Date: July

26,

201

1

DGM BUSINESS DEVELOPMENT POWER)

MIS CESC Limited

CESC House

Chowringhee Square

Kolkata - 700 0022

West Bengal.

KIND ATTN M R ADRlT PALCHOUDHURY

SUB: ICML 9MW SOLAR POWER PROJECT AT PRATAPGARH, DlST

KUTCH,

GUJARAT

CLARIFICATION

TO

DSLP

CQACULATIONS

AND

SWITCH YARD LIGHTING PROTECTION LAYOUT

REF: 1) ICML REF: LII GEOE

11

055-E-11-12-015 DT 51712011

Dear Sir,

Further to your queries vide your mail referred 1) above

regarding SCADA

System, we are pleased to attach herewith point-wise clarifications with respect

to the above system

for your kind perusal.

We

hope the above is in line with your requirements and would request you to

kindly let us have your approval to enable us to proceed further.

Thanking you and assuring you of our best services at all times.

Yours faithfully

For ETA ENGINEERING PVT

LTD

SAURABH CHAUHAN

GENERAL MANAGER

Encl: as above

Regd. Office :

5,

Moores Road, Chennai

-

600 006 Tamil Nadu, In dia

Branches Tel.) Bangalore : 41802300, Chennai : 28297626, Hyderabad

:

27763529130, Mum bai : 67742700, Pune : 26051310, Kolkata : 24864329


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subject to incorporation of Commentslmodificatlons as noted Resubmit revised drgs ldocs after Incorporating the comments


3/11

DOCUMENT No :

ETA/ICML/SOLAR/GUJ/ELECT/ERTH/OS9 A

Lightning Protection Calculation for 66/11

kV

S SControl Room

CONTROL ROOM BUILDING

For design of lightning protection we have analysed the tallest part of the building.

i.e. Top terrace level area of the control room.

Annual thunderstrom days

=

30 days

Estimation of exposure of risk Ref CI.No.8.1.2 of IS 2309)

Control Room Area :

Length

L - 20 m

W~dth W = 11.6 m

eight H 4.2 m

Collection Area Ac

=

[

LXW

+

2[U(H] + 2[WXH]

+

P

X

H

Ac

. =

552.86488 m2

TOTAL COLLECTION AREA:

Ac = 552.86488 m2

~ i g h t n i n ~lashes per km2 per year 'Ng' for thunderstrom dayslyear as per

Ref Clause

no.

8 1 2

of

IS

2309.

Ng

=

1.9

Probable number of strikes risk) to the structure per.year is

P =ACXN~XIO

P = 1.05E-03

Weighting factor Ref CI.No.

8 1 5

of IS 2309)

A

1O from table-IA,for use of structure.

B 0.4 from table-1 B,for type of construction.

C 1

O

from table-1C,for content or consequential effects.

D 1

O

from table-I D,for degree of isolation.

E 0.3 from table-I E,for type of company.


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The overall weighting factor A*B*C*D*E

0.12

After applying the weighting factor, Probable risk factor

P 1.05E-03 0.12

Probable risk factor : P 1.26E-04 per year

As per cl.no:8.1.3 of IS 2309 suggested acceptable risk figure per year. Protection is not required)

Now from the above calculation i t has been found that probable risk factor P

is more than the acceptable risk factor.Hence protection is necessary.

One down conductor i s required for each 30m of perimeter of the

structures protected as per 18-2309 CI.No.12.2.3

B)

Total Perimeter to be protected

-

63.2 m

Hence, from IS 2309 CI. No. 12.2.3 b) minimum Three down conductors are required.As shown

in ayout we are providing four down conductors.


5/11


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SCHEDULE OF EQUIPMENT

-66kV

IS. O. I DESCRIPTION I Qlv. I SYMBOL

I

72.5KV.B30 31.WA FOR 3

SF6

aRculT

BREWER.

01 NO..

1

1 72.WV.630AJl.SKA FOR S a c , ENTER BREAK

ISOU mR THREE PHASE WTH EARTH Sm TM I OZ

1

I PHASE 7ZWV WlDM R PT (3 SCONObRY)

P P PIypu

03 NO..

SURGE ARRESTOR INC OXIDE 8CUV.lW A

8

N h

6

I

SlRlNG INSULATOR

IAS

ER

BW(

12.5 MVhll/BBKV. 3Ph. DYnll

O N A N / ~ S m m m

or NO..

2 . 1

C L E A R A N C E T A B L E

m A s m PHASE (PP)

PHASE TD EARTH (PE)

scncu

CLE*RANCE SC)

CROVNO CLEARANCE

I

4 2 M

TO THE NEbREST PART NOT AT EARTH 2440

P o m n A L w AN

I N ~ A T W

A HIMEST SlSTDl WLTADE

72.5

kV

B UMlNINC IMPVLSE WLTAGE

TIPES OF SISTDl EARTHING

SWOLY EARTHED

0. SISrm FRECUENCY

NOTES:

1 U DIMENSIONS ARE IN MM. UNLESS D TH W SE SPECIFIED.

2. CREEPAGE DISTANCE- 25 mm/ kV, MINIMUM CREEPAG: 182 5mm .

NO.^ DISC INSULATORS:

BNOS (TENSION)

5NOS (SUSPENSION)

3

CONDUCTOR SIZE/DElAILS.

- W N BUS : ACSR SINGLE ZEBRA

- EOUIPMENTS IWER CONNECTION.

WAF0

BAY UNE

BAYS :

ACSR SINGLE ZEBRk

4 CONDUCTOR TENSION

- W N BUS : 1000 ko/CONWCTOR/PHASE.

- OMER BUS

:

1 0 0 0 /PwE.

-

SHIELD WIRE

:

5 0 0 kg.

5. PUN TH HEIGHT OF AU EOUIPMENT FOUNOATlON WI U BE +300MM PlU lrm

MCEPT CB FROM M E FINISHED COUND L M L F.C.L). GRAVEL TOP

LEML

WlLL BE +150MM FROM

TH

F.G.L

6.

DETAILS OF CABLE TRMCH W lU BE

SHWM

IN OUTDOOR, INDOOR TRENCH LAYOUT.

7. DElAILS OF CULVERT TYPE TRENCH AND CABLE ENTRY INSIDE CONTROL RW M

WlLL BE SHOWN IN TRENCH MYOUT.

8 REFER PR ESENT DRAWlNC FOR LAYOUT PURPOSE ONLY

NL

nnmi

2 4 . ~ 1 1

XI

APPROVU

F IN

APPROVAL

ISIUDBY

ypBByY

PRPBY

N A N

A m

Blnn

Am

INTEGRATEDCOAL h t M N G m D

~P OIIFIACT R ~? -PRIVA~~UMIIPD

-

- = =

-

'-

---- -

= II . I UYI

*

IU M,

. ..

I-ul. -n-

PROECT

9 ~ ~ S O W W ~ K i O E T A T K l l N l ~ A I

br nt l t

SWITCHYARD

LAYOUTPL N


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238507778 Clarification for DSLP Calculations Switch Yard Lighting Protection 1