SINGLE TIME DIAGRAM OF 765 Kv Meerut

LINE LENGTH IN KM

SINGLE TIME DIAGRAM OF 400 Kv Meerut

One and Half Breaker scheme

21 3

1,2,3--.>Breaker Red –open ,Green-close

CT are provided on both side of Breaker so that differential and line protection provided

If all breaker are closed power is feed from both bus and goes

through line 3 and 4Two

Line protection is done by out board CT of Line breaker

Differential protection is by outboard CT of bus breaker

ONE AND HALF BREAKER SCHEME

Two line and feed from single Breaker so called breaker and half

Separate differential protection is provided for each bus

Mid bus section protected by line protection

If breaker 4 to be on maintenance open isolator of breaker 4 now

feeder1 and 2 are feed from bus 1

If a fault on bus A it is isolate from system and now feed by bus b

SINGLE bay overview Moga line

7 10 89 A E

BAY

Voltage level

89-ISOLATOR52-BREAKER

A,B For Similar EquopmentsOn same bay

Eqipment E-Earth switch

TWO MAIN BUS & ONE TRANSFER BUS

End of grading capacitor Nameplate of grading capacitor 500pf

400KV CIRCUIT BREAKER

765KVDOUBLE

TBREAKER

420KV

T

BREAKER

WITHGRADING

CAPACITOR

245KV

T

BREAKER

WITHGRADING

CAPACITOR

CAPICITOR VOLTAGE TRANSFORMER

SECONDARY CAPACITANCE GREATER THAN PRIMARY (ALMOST 18 TIMES

D=DRAIN COLIS=SURGE ARRESTOR

800KV CT DETAILSTHREE CORE FOR PROTECTION AND TWO FOR METERING

800KV

CURRENTTRANSFORMER

420KV

CT

245KVCT

800KV KNEE TYPE ISOLATOR

OPERATED DEVICE

MOTOR AC VOLTAGE 415

CURRENT 3150AMPS

This keen moves & touch 2

2

765KV

KNEETYPE

ISOLATOR

Double break rotating type

420KV ISOLATOR

245KV

CENTERBREAKISO

MORESTOR GAPLESS POLYMER SURGE ARRESTOR/ZnO Gapless Lightning Arrester or Surge Arrester

TYPE:LASER (LPSC)

Max Continuous operating voltage 66.75KvELIEFCURRENT:63kamps rms

Nominal discharge current:20kAmps

Spacer Arc horn

Carona ring top Carona silt

220v dc (110*2) Two banks

48v(24*2) Two banks