- Location
- Massachusetts
I got sent to check out a breaker that was "taped off"
supplying a capacitor bank.
I have almost no info at all other then the customer wants to get this back on line. The conductors had been removed from the breaker and taped up.
The wire way showed signs of a heavy ground fault at the lock nuts
and the hardware holding it together.
The 480 volt circuit to this capacitor was supplied by a 400 amp breaker installed in a 2000 amp distribution section of service gear located very close to the transformer. The conductors where 500 Kcmil and a 1/0 EGC.
I tested the conductors, all drove my mega meter to it's limits (they tested fine) I then pulled them out and looked them over and they looked fine.
So that said, it must be a ground fault at the capacitor bank but that shows clear at 250 volts to ground and there is no sign of a flash inside the unit.
Here is the units info
Is it normal for a capacitor to fault to ground then show clear?
I am open to any ideas at all, I do not feel like putting power to this unit again without knowing what caused the ground fault.
supplying a capacitor bank.
I have almost no info at all other then the customer wants to get this back on line. The conductors had been removed from the breaker and taped up.
The wire way showed signs of a heavy ground fault at the lock nuts
and the hardware holding it together.
The 480 volt circuit to this capacitor was supplied by a 400 amp breaker installed in a 2000 amp distribution section of service gear located very close to the transformer. The conductors where 500 Kcmil and a 1/0 EGC.
I tested the conductors, all drove my mega meter to it's limits (they tested fine) I then pulled them out and looked them over and they looked fine.
So that said, it must be a ground fault at the capacitor bank but that shows clear at 250 volts to ground and there is no sign of a flash inside the unit.
Here is the units info
Is it normal for a capacitor to fault to ground then show clear?
I am open to any ideas at all, I do not feel like putting power to this unit again without knowing what caused the ground fault.