Breaker Interrupter rating
Breaker Interrupter rating
(OP)
We are planning to replace an old 138 kV OCB (Westinghouse) for a new one with higher rating. The available fault on the system is 73kA asymmetrical which corresponds to 51kA symmetrical (X/R =39.1). We are struggling with what interrupting capability does the present breaker have. The nameplate info is:
Type 1380GM13000
138 kV (operating voltage=115 kV)
2000 Continuous Amp
60 Hz cycle
650 kV impulse withstand
10kA rated interrupting MVA@ rated voltage
Can one calculate the sym/asym interrupting rating of the above breaker from the nameplate info alone? I guess the other option is to run fault current analysis on the breaker?
Appreciate you going over this thread.
Type 1380GM13000
138 kV (operating voltage=115 kV)
2000 Continuous Amp
60 Hz cycle
650 kV impulse withstand
10kA rated interrupting MVA@ rated voltage
Can one calculate the sym/asym interrupting rating of the above breaker from the nameplate info alone? I guess the other option is to run fault current analysis on the breaker?
Appreciate you going over this thread.






RE: Breaker Interrupter rating
RE: Breaker Interrupter rating
How do we really test a breaker's interrupting capability?
RE: Breaker Interrupter rating
RE: Breaker Interrupter rating
How do you calculate the interrupting rating? See ANSI/IEEE Std C37.081-1981, IEEE Guide for Synthetic Fault Testing of AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis for testing, but I don't think you really want to subject an old breaker to a fault interrupting test. Where are you planning to use the old breaker?