duki
Electrical
- Apr 21, 2003
- 31
We have 4-13MW, 13.8kV generators that are cabled to a 13.8kV switchgear. Each generator has its own breaker. The generators are grounded via a resistor rated at 200a for 10s. The problem comes in sizing the cable from the star point at the generator to the resistor located outside the substation. Since we have the 200A resistor, I says we only have to size the conductor for 200A. Another engineer is saying we should size it for 200A then double it for a 3rd harmonic current. The resistor manufacturer is running 4/0 awg from the resistor to ground. Any opinions??