system operation memorandum t-08

7/18/2019 System Operation Memorandum T-08

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tion

ELECTIUCITY

NETWORK

AFFAIRS

ELECTRICITY

TRANSMISSION

DEPARTM

ENT

SYSTEM

OPERATION

MEMORANDUM

No

: T-08

KAHRAMAA STANDARD SINGLE LINE DIAGRAM NUMBERING

SYSTEM FOR DOUBLE BUSBAR SUBSTATIONS

For D

ouble

Busbar substation our stand ard is as follow:

Location of Main

Reserve

Busbar

, Bus Coupler

and

Bus-Sectionalizers :

1.

Wh

en

both

Busbars are with horizontal plan then busbar near cable sealing

ends

is Reserve Busbar

whil

e Busbar

nea

r e e is Main Busbar. When Busbars

are

with

vertical plan i.e. one Busbar is

over the other

th

en

the up per Busbar is

Reserve

and

lower one is Main. In

e e

MMI. Always Res

erve B/B

is on

top while main busbar is at bottom.

The mimic in the LCC

pan

el, facing it will be as follows:

• The

Main

Busbars isolators and its

sw

itches are k

ept

on LEFT

sid

e.

• The Reserve busbar isolators an d its switches are k

ep t

at RIGHT side

2. For a standard d

oubl

e Busbar configuration with two bus-sections : Facing the

Busbar from ee. side, the Left

hand

side section shall be designat ed as Ml

and

RI , and the right hand side section shall be designat

ed

as M2

an d

R2

3.

ther

e are more than two bus sections then, facing

th

e busbar from

e e

side

the Left hand side section shall be designated as Ml / Rl followed by M2/ R2,

th

en

M3/ R3, M4/R4 a

nd

so on.

4. Fu

tu

re Extens ion of a new busb ar on the left h

and

side of Ml

/R

l (facing the

busbar from LCC side) shall be designat

ed

as MIA /R

IA

and so on.

5.

The

Bus-section and Bus-Couplers shal l be designated as fo

llows

:

• Bay 12 -Coupl

ing

Busbar Ml M2

• Bay 32 - Coupling Busb

ar

M2 M3

• Bay 52- Coupling Busbar M3

M4

and

so on.

(The Sectionalizers on

Main

Busbar will s

tar

t from Odd Number)

• Bay 22 - Co

up

ling Busbar Rl R2

• Bay 42 - C

ouplin

g Busbar R2 R3

• Bay 62 - Coupling Busbar R3 R4 and so on.

(The Sectionalizers on Reserve Busba r will start from Ev

en

Number)

• Bay 13 - Coupling Busbar

Ml

Rl

• Bay 23 - Coupling Busbar M2 R2

12-November-2009



ELECTRICITY

NElWORK

AFFAIRS

ELECTRICITYTRANSMISSION DEPARTMENT

• Bay 33 -

Coupling

Busbar M3

R3

• Bay 43 - Coupling Busbar M4 R4

and

so on.

The above designation shall

prevail

irrespective of whether the Configuration

is of Single Busbar or Double Busbar system:

Designation

of Feeder Bays

each Busbar

6. For Bus M1/R1 the Bay Number for feeders will start from 10, 30,

50,..... and shall be reserved upto 90 to take care of future extension

i

any.

it is known beforehand

that

the

number

of feeders is more than 90 then the

next numbers shall continue i.e. 110, 130, . .. . Etc. The Bay numbers will start

in ascending

order from the

Bus Sect ion bay 12) i.e. the

lowest

bay

number

bay 10) shall be the closest to Bus Section bay 12). This also

means that

the

Bay numbers will be in

descending order from

Right hand side of the busbar

when facing the busbar

from

LCC side

7. For Bus

M2/R2

the Bay

Number

for feeders will

start

from 20, 40,

60,

.....and shall be reserved upto 100.

it

is known beforehand that the

number

of feeders is

more than

100

then

the

next

numbers shall continue i.e.

120, 140, . .. . Etc. The Bay numbers will start in ascending order from the Bus

Section bay 12) i.e. the lowest

bay

number bay 20) shall be the closest to Bus

Section bay 12). This also means

that

the Bay numbers will be in ascending

order from

Left

hand

s ide of the

busbar

when

facing the

busbar from

LCC side

8. For Bus M3/R3 the Bay

Number

for feeders will

start

from 110, 130,

these numbers

are

consumed in Bus

M1/R1 then

for M3/R3 it shall

start

from

the next

higher

number. The Bay

numbers

will start in ascending order from

the Bus Section bay 32) i.e. the

lowest bay number

bay 110) shall be the

closest to Bus Section bay 32). This also means

that

the Bay

numbers

will be

in ascending

order from

Left hand side of the

busbar when

facing the

busbar

from LCC side

9. For Bus

M4/R4

the Bay

Number

for feeders will start from 120, 140,

these numbers are consumed in Bus M2/R2 then for M4/R4 it shall start from

the next higher number The Bay numbers will start in ascending

order

from

the Bus Section bay 52) i.e. the lowest bay

number

bay 120) shall be the

closest to Bus Section bay 42). This also means

that

the Bay numbers will be

in

ascending

order from Left hand side of the

busbar

when facing the

busbar

from

LCC side.

12 Nov

ember-2009



ELECTRICITY

NE1W

ORK AFFAiRS

E L ~ c r

R T Y

TRAN

SMISSIP /I

R

E N T

Designation of Transformer Bays

10. For Transformer Bays, the designation s

ha

ll be in sequence

i.e,

• Bays

on

M1

/R1

, M

3/

R3 etc sha ll be Bay 11 18, 31/ 38 and so on

• Bays M2/R2 , M4/R4 etc shall be Bay 21/ 28 41/ 48 and so on .

• The first digit of the bay shall be same on the HV side and LVside. i.e, for

e.g.

if

from a 220kV bus there are two outgoing transformer bays each

terminating on a bus of different voltage, one on 132kV

and

one on 66kV

then bays designation shal l be as follows and an example is

show

n in Fig2.

L HV side of 220/ 132kV Tx1 = Bay 011

ii

LV side of 220

/132kV

Tx1 Bay

CIS

iii. HV side of 220/ 66kV Tx1 Bay 0 31

IV .

LV side of 220

/66kV

Tx1

=

Bay B38

The same philosophy holds good for the reverse configuration i.e.

multiple bus on HV side terminating

on on

e single bus on LV side. An

example is shown in Fig 3.

• The transformer designation s

ha

ll

include

the HV and LV side voltage

references su

ffixed by T T2, etc. For e.g. :

i. 220/132kV Tx 1 shal l be designated OC-Tl

i i 220/ 66kV Tx 2 shall be designated as OB-T2

iii. 132/66kV T x 1 shall be designated as CB-Tl

Designation of Bus-VT Bavs

on

each Bushar

11. The

VI

Bays

on

M1 will be 016 M2

-026

, R

1-036

R2

-046

, M3-056, R3-066,

M4-076, R4

-086

etc. The VI isolators for that bay will be suffixed by 4 to the

respective Bay No (for e.g.: Dl64

0264

, 0 364, etc) and the

VIs

will be suffixed

by 6 to the respective Bay No (for e.g.: D166VI,

026

6VT, 0366VT, etc). The

Maintenance Ear thswitc

hes

i f any) for the VIs

which

are located between the

Bus VI isolator

and

Bus

VI

will be numbered as M1 suffixed to the respective

Bay No. (for e.g.: D16M1, D26M1,

036M1

,. ....)

De

signation

of Bus Earth switches

on

each Busbar

12. The Ear th swi tch on Bus M1 shall be termed as 1241. Similarly fo r R1 it will be

2241

13. The Earth switch on Bus M2 shall be termed as 1261. Similarly for R2 it will be

2261. If there are two Bus-Earth switches on the same bus

bar

then the

Earth

switch which is near to 120 will be t

ermed

as 1261 and the ea

rthswi

tch which

12-November-2009



ELECTRICITY NETWORK AFFAIRS

ELECTRICITYTRANSMISSION DEPARTMENT

is near to 320 will be termed as 3241. Similarly for R2 it will be as 2261 OR

4241

14. The Earth switch on Bus M3 shall be termed as 3261. Similarly for R3 it will be

4261. there are two Bus-Earth switches

on

the same busbar then the Earth

switch which is near to 320 will be termed as 3261 and the earth switch

which is near to 520 will be termed as 5241. Similarly for R2 it will be as

4261 OR 6241

15. The

Earth

switch on Bus M4 shall be termed as 5261. Similarly for R4 it will be

6261

Designation of

Isolators

for Bus-Section Bays

16. The Busbar Isolator on Main / Single Bus for the Bus- Section Bays shall be

designated as follows

• Isolator between

Main

Bus Ml

and

CB 120) shall be 124

• Isolator between CB 120) and Main Bus M2 shall be 126

• Isolator

between

Main Bus M2 and CB 320) shall be 324

• Isolator between CB 320)

and

Main Bus M3 shall be 326

• Isolator between MainBus M3 and CB 520) shall be 524

• Isolator between CB 520) and Main Bus M4 shall be 526

and

so on.

17. The Busbar Isolator

on

Reserve Bus for the Bus- Section Bays shall be

designated

as

follows

• Isolator between Reserve Bus Rl and CB 220) shall be 224

• Isolator between CB 220)

and

Reserve Bus R2 shall be 226

• Isolator between Reserve Bus R2

and


• Isolator between CB 420) and Reserve Bus R3 shall be 426

• Isolator between Reserve Bus R3

and


• Isolator

between

CB 620)

and


and

so on.

Designation of

Isolators for Bus Coupler

Bays

18. The Busbar Isolators

on

for the Bus-Coupler Bays shall be designated as

follows:

• Isolator

between

Main Bus

Ml

and CB 130) shall be 134

• Isolator between CB 130) and Reserve Bus Rl shall be 132

• Isolator between Main Bus M2

and


• Isolator between CB 230) and Reserve Bus R2 shall be 232

12-November-2009



ELECTRICITYNETWORKAFFAIRS

ELECTRICITY

TRANSMISSION DEPARTMENT

• Isolator

between

Main Bus M3 and CB ( 330) shall be 334

• Isolator between CB ( 330)

and


• Isolator

between Main

Bus M4

and

CB ( 430) shall be 434

• Isolator between CB ( 430) and Reserve Bus R4 shall be 432 and so on

Designation of Maintenance Earthswitches on each Bay

19. The Maintenance Earthswitches for a feeder Bay shall be designated as follows:

• Between Busbar Isolator and CB, it shall be as Ml (for e.g.: 10Ml). This

also applies

i

the maintenance earth-switch is a part of a 3-position Switch

associated with either Main Busbar Isolator or Reserve Busbar Isolator.

• Between Line Isolator and CB, it shall be as M2 (for e.g. : 10M2)

• In a double

busbar

system, if the Busbar isolators

are

3-position switch

with an associated earthswitch

then

it may happen that there are

two

maintenance earthswitches between the Busbar Isolator and CB. In such

cases the Maintenance earth-switch associated

with

Main Busbar Isolator

( xx4) shall be designated as Ml ( xxMl) and the Maintenance earth

switch associated with Reserve Busbar Isolator ( xx2) shall be designated

as M3 ( xxM3).

20. The Maintenance Earthswitches for a Bus-Section Bay shall be designated as

follows:

• Between Busbar Isolator ( x24) and CB, it shall be as Ml

• Between Busbar Isolator ( x26) and CB, it shall be as M2

21. The Maintenance Earthswitches for a Bus-Coupler Bay shall be designated as

follows:

• Between Main Busbar Isolator ( x34)

and

CB, it shall be as Ml

• Between Reserve Busbar Isolator ( x32) and CB, it shall be as M2

Designation of Isolators & Earthswitches in terminal compound

22. For Isolators

and

Earthswitches installed in the terminal

yard

in addition to the

Line Isolator and Earthswitches in the GIS the designation of such equipment

shall be:

• Line Isolator in Terminal Yard shall be suffixed by A to the line isolator

designation in the GIS.

E.g.: line isolator in GIS is D303 and the same bay has another

isolator

in

terminal yard then it shall be designated as D303A. there

12 November 2 9

y



ELECTRICITY

NETWORK

AFFAIRS

ELECTRICITY


is more than one isolator then it shall be designated as D303B D303C

and

so on.

• Line Earthswitch in Terminal Yard shall be suffixed by A to the line

Earthswitch designation in the GIS.

i.

E.g.: Line Earthswitch in GIS is D301

and

the same bay has another

Earthswitch in terminal yard then it shal l be designated as D301A.

there is more than one earthswitch then it shall be designated as

D301B D301C and so on.

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12-November-2009

I

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Designation

I

Line Isolator -Q9111

D3 3A

I

Line

Earthing

Switch

D3 A

I

81



ELECTRICITYNETWORK AFFAIRS

ELECTRICITY


Designation

of various equipment in

the

Switchgear

23. TI1e designation of various components in the switchgear shall be as follows:

xx yy

I

l

__ Equipment designation

Bay Designation

---------- Voltage Level

Voltage level

Designation

(

A

E

B

C

D

G

Voltage

level

11 kV

33kV

66kV

132kV

220kV

400kV

Colour

I

(In

the Substation I

Mimic / Control Panel)

Red

Green

Brown

Black

Blue

Telemagenta

RAL

Colour

code

RAL3024

RAL6002

RAL8004

RAL9004

RAL 5015

RAL4010

Bay Designation (XX)

XX I Bays

1 2 3 4 .....

Feeder Bays

including

bays feeding Aux

transformers (11/0A15kV Tx, 33/0.415kV Tx, etc)

11, 21, 31, 41, .....

Transformer Bays (HV side) except bays for Aux

transformers

(11/0A15kV Tx, 33/0.415kV Tx, etc)

18, 28, 38, 48, .....

Transformer Bays (LV side) except bays for Aux

transformers (11/0.415kV Tx, 33/0A15kV Tx, etc)

12, 22, 32, 42, .....

Bus Section Bays

13, 23, 33, 43, ..... Bus Coupler Bays

16, 26, 36, 46, .....

Bus VT Bays

12-November-2009

. Page No 49

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ELECTRICITY

NETWORK

AFFAIRS

ELECTRICITY


Equipmen

t

Designation

YY

yy

Equipment

Description

°

Circuit Breaker

1 Line Earthswitch

2 Reserve Busbar Isolator

3 Line Isolator

4

Main Busbar Isolator

Bus Section Isolator on LHS of CB refer item 16, 17

6

Bus Section Isolator

on

RHS of CB refer item 16, 17

Voltage Transformer refer item 11

41,61 Bus Earthswitch refer

item

12, 13, 14, 15

CT

Current

Transformer

Ml

Maintenance Earthswitch between Busbar Isolator

and

CB refer Sr. 19, 20, 21

M3 Maintenance

Earthswitch

between Busbar Isolator and

CB refer Sr.

19 20 21

M2 Maintenance

Earthswitch

between Line Isolator

and

CB

refer Sr. 19 20 21

Circuit Breaker connected in series to an

upstream

CB

lA IB

..

Line

Earthswitch

connected in series

in

Cable

compound

etc with an upstream Line Earthswitch

3A,3B,..

Line Isolator connected in series in Cable

compound

etc

with an upstream

line isolator

13 23 33 ..

Stage Switching devices for Capacitor Banks

11 21 31

...

Stage Earthing Switch for Capacitor Banks

Note

All the designations as lis ted in this SOM shall prevail irrespective of

whether

the

Configuration

is of Single Busbar or Double Busbar system:

Enclosure:

• Fig 1 :Typical single line

diagram

• Fig 2 : Transformer Bay Designat ion

with

multiple voltage level on LV side

• Fig 3: Transformer Bay Designation

w i t ~ ~ i

n ~ u w a r i

Director

Electricity Networks Affairs

Kahramaa

12-November-2009



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ELECTRICI TY NETWORK AFFAIRS

ELECTRICITY

TRANSMI

S

SION

DEPARTM ENT

F IG 1 :

SLD

for Double

Busbar

having mo re

than

two

bus sections

BB

R1

366

VT

364

224

220

BB

R2

226

466

VT

464

42 4

420

BB

R3

426

666VT

66 4

62 4

62 0

BBR4

626

866

VT

864

132

130

134

BB

M 1

2241

1241

124

164

166 VT

2261

1261

120 126

BBM

232 4241

230

234 3241

324

264

266 VT

320

4261

3261

326

BBM

332 6241

330

334 5241

524

564

566 VT

520

6261

5261

526

BB

M

432

430

434

764

76 6 VT

Note: ll device

des

ignations

sha

ll

be

p refi xed

wi

th follow ing alph

bets

depend ing upon the voltage

G -

For

400kV 0 - Fo r 220kV C -

Fo r 132kV

B -

For

66 kV E -

For

33 kV A -

Fo r

11 kV

12 Novemb

er-200 9

Page

No :

51



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ELECTRICITY

NElWORK

AFFAIRS

ELECTRICITYTRANSMISSIONDEPARTMENT

220/132

kV

Tx3

DC-T3

2 2 0 / 6 6 kV

T x 3

D B -T3

220/132kV

Tx 2

DC

-T2

,

220/66kV

Tx2

D B -T2

220/66kV

Tx1

DB-T1

,

220/132kV

Tx1

DC -T1 )

Fig

2 :

Transformer

Bay Des igna ti on

with mul t ip le

vol tage

level

on

LV

s ide

BB

M2

J

C78

J

C :;

j C48

C78 C38

C 4 ~ 8 ~

J

8 58 8:;0 j

8280

858 818 828

:

132

kV

BBM

BBM

66kV

BB M 1

BBM

~

12 November-2009

Page No: 52



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on

ELECTRICITY NETWORK AFI'AIRS

ELECTRICITYTRANSMISSION DEI'ARTMENT

F ig 3 : Transformer ay Designation with multiple

voltage level

on

HV

side

220 kV

0

220/66kV

Tx1

DB-T1

M

220/66kV

Tx2

DB-T2)

132/66kV

Tx1

CB -T1)

132/66kV

Tx2

CB-T2)

~

66

kV

1 80 1 80 1 1 80 _

_

_

_ _

838 8 8 8 848

M M

>

12-November

-2009

Page No

: 53



R e f e r e n c e : T D / E T A / 2 0 1 0 / 1 5 6 2 d a t e d 2 5 / J u l / 2 0 1 0

system operation memorandum t-08

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