Table 4 Single-phase break fault with high resistance grounding
Grounding resistance(Ω) | Ungrounded | Arc suppression coil grounded | Low resistance grounded | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
n1 | UO(V) | n1 | UO(V) | n1 | UO(V) | ||||||||
MG | NG | MG | NG | MG | NG | MG | NG | MG | NG | MG | NG | ||
Pure resistance | 700 | 1.0 | 700.1 | 527.2 | 1.0 | 5011.3 | 4916.5 | 1.0 | 83.7 | 63.8 | |||
1000 | 613.8 | 476.2 | 4871.9 | 4687.9 | 74.5 | 57.7 | |||||||
1500 | 513.4 | 445.8 | 4651.3 | 4435.2 | 62.4 | 54.1 | |||||||
2000 | 473.2 | 434.5 | 4539.6 | 4138.4 | 57.6 | 52.8 | |||||||
Arc resistance | 700 | 1.0 | 656.2 | 491.4 | 1.0 | 4702.3 | 4625.5 | 1.0 | 78.5 | 56.2 | |||
1000 | 548.4 | 456.1 | 4468.9 | 4302.1 | 66.1 | 53.5 | |||||||
1500 | 480.8 | 435.7 | 4256.8 | 4189.6 | 58.2 | 52.0 | |||||||
2000 | 455.4 | 428.5 | 4186.7 | 4125.9 | 55.2 | 51.6 | |||||||