DESIGN TIP-2 A/R CLOSE

Auto reclose function 1. In 1-1/2 scheme auto reclose should close bus side breaker first and middle breaker secound. 2. The one more condition for close the middle breaker by A/R is the other two breakers should be in closed condition.

380 KV GIS THOSHIBA

INTER LOCK FOR CIRCUIT BREAKER (GAS & HYDRAULIC OIL)

1. For tripping operation the HYDRAULIC OIL pressure must be 25.5 MPa and GIS gas pressure of the CB compartment should be 0.7 MPa . Breaker failure should be initiates If CB is failure to trip condition.

2. For closing operation the HYDRAULIC OIL pressure must be 27 MPa and GIS gas pressure of the CB compartment should be 0.725 MPa .

3. Normal condition Gas pressure CB 0.75 MPa, Gas pressure other compartment 0.6 MPa, Hydraulic Oil pressure 31.5 MPa