COelectrician
Electrical
- Nov 23, 2010
- 7
I'm hoping someone can provide some insight into ground fault pickup settings.
Motor info:
1. 2400 volt;
2. Solidly grounded;
3. Fuse/vacuum contactor starter;
4. 1.15 SF
5. ~8k amps ground fault current
6. Zero sequence 50:5 CT for ground fault protection;
7. 300Hp
I've read through the Buff book as well as many many online resources and can't find a resource which provides an explanation on how to choose the ground fault pickup current setting for a solidly grounded mv motor. With a time delay of 0.1 seconds, the fuse will clear a fault.
Any insight would be appreciated.
Thanks.
Motor info:
1. 2400 volt;
2. Solidly grounded;
3. Fuse/vacuum contactor starter;
4. 1.15 SF
5. ~8k amps ground fault current
6. Zero sequence 50:5 CT for ground fault protection;
7. 300Hp
I've read through the Buff book as well as many many online resources and can't find a resource which provides an explanation on how to choose the ground fault pickup current setting for a solidly grounded mv motor. With a time delay of 0.1 seconds, the fuse will clear a fault.
Any insight would be appreciated.
Thanks.