First time here and very impressed how much one can learn here. I have a question concerning 5,000-volt vacuum breakers & 480-volt motor controllers. The coils are 120-volt AC and occasionally a coil will become defective and will replace the coil according to manufactures instructions (proper spacing, torque, etc.). But still there is an occasional coil going bad and curious if a LCR meter can be used to inspect a coil before installation at a certain temperature (usually 20C). We don't have voltage issues such as the coils being over or under voltage and a constant 120-volt AC is maintained.
As the coils age and the insulation begins to breakdown, can a LCR meter detect this?
Recently we had a 30-hp, 3 phase AC motor tripped its circuit breaker and after checking ohms & megging with a Fluke meter, the stator appeared good. But with my LCR meter I detected an ohm imbalance and inductance imbalance & after replacing the motor, the VFD & motor are working correctly. If a LCR meter can be used for checking coils mentioned above, is a particular meter recommended?