12kV GE Vacuum Breakers

Question 1

Prevents a closing operation when the breaker is between the Disconnect/Test and Connect positions.

Opens contacts in the 52-LCS to open the close circuit.

Answer 1

Negative Trip Interlock

Question 2

Backup to the Negative Trip Interlock and provides the same features but operates closer to the connect position.

Answer 2

Redundant Negative Trip Interlock

Question 3

Prevents racking of a closed breaker.

Will not allow a racking handle access to the hex head jack screw.

Will not allow the lift truck to pick up a closed breaker.

Answer 3

Positive Interlock

Question 4

Held open by the closing spring discharge interlock which prevents charging the closing spring when the breaker is between the Disconnec/Test and Connect positions in the metalclad

Answer 4

52/CL-MS

Close Latch Monitor Switch

Question 5

Closed until the closing spring is fully charged

Answer 5

52/SM-LS

Spring Motor Limit Switch

Question 6

Contacts in the close circuit are held open by the Negative Trip Interlock Roller when the breaker is between the Disconnect/Test and Connect positions

Answer 6

52/LCS

Latch Checking Switch

Question 7

What two switches are operated by a roller adjacent to the flywheel?

Answer 7

52/SM-LS and 52/CHG

Spring Motor Limit Switch and
52 Charge Switch

Question 8

What two control schemesdoe the 52/SM-LS serve as a permissive for?

Answer 8

1) Spring Charging Motor Circuit

2) Anti-Pump Relay Circuit

Question 9

Prevents racking a breaker with the closing spring charged.

Discharges the closing spring if the breaker is between the Disconnect/Test and Connect Positions

Operns the 52/CL-MS to prevent the motor from charging the closing springs

Answer 9

Closing Spring Discharge Interlock