sizing breaker for gas compressor
sizing breaker for gas compressor
(OP)
this is a NEC job, sizing a breaker for a 3-phase 13.8 kV, 10,000 HP motor
i am coming up with a 1200A breaker, is this correct?
i am coming up with a 1200A breaker, is this correct?





RE: sizing breaker for gas compressor
RE: sizing breaker for gas compressor
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: sizing breaker for gas compressor
yes, we are using a protection relay (SEL)
RE: sizing breaker for gas compressor
RE: sizing breaker for gas compressor
RE: sizing breaker for gas compressor
RE: sizing breaker for gas compressor
Good Luck
Dave
RE: sizing breaker for gas compressor
We put in quite a few 15,000 and 22,000 HP synchronous motors in the 12.47-13.8 kV range. The motor breakers were 1200-amp VCB's with protection taken care of by microprocessor-based motor protection relays and the motor manufacturer's excitation controls. The electrical control and protection was pretty conventional, as one might imagine, but it was tied into compressor control and station control systems.
Previous problems with breakers failing to open caused us to use a breaker failure backup system. If a motor breaker was called upon to trip and failed to do so, we trip the bus incoming main. I find that prudent.
At another facility I work with, we have a couple dozen 4160-volt motors controlled by 5 kV circuit breakers. Again, motor protection relays provide the protection functions.
old field guy