jliu1
Electrical
- Jul 12, 2002
- 23
We have 6.9KV system powered by Emergency Generator with high resistance grounded. It is a requirement that the system will stay in operation for first ground fault, considering its emergency functions.
The questions are, under the condition:
1. Will the 8KV cable be specified with 173% insulation since the 133% insulation is not enough to cover the 6.9KV*1.73=11.95KV? Or 15KV cable needs to be used?
2. What about MV motor winding insulation?
3. What about Switchgear?
Thanks for any input.
The questions are, under the condition:
1. Will the 8KV cable be specified with 173% insulation since the 133% insulation is not enough to cover the 6.9KV*1.73=11.95KV? Or 15KV cable needs to be used?
2. What about MV motor winding insulation?
3. What about Switchgear?
Thanks for any input.