From: Pilot protection of hybrid MMC DC grid based on active detection
Fault impedance Ω/distance | Correlation coefficient (positive/negative) | Fault section | Fault pole | Operate or not (Y/N) |
---|---|---|---|---|
0.01/150 | −0.903/0.931 | internal | positive | Y |
50/150 | −0.801/0.928 | internal | positive | Y |
100/150 | −0.731/0.916 | internal | positive | Y |
300/150 | −0.633/0.902 | |||
0.01/250 | −0.923/0.919 | internal | positive | Y |
50/250 | −0.836/0.917 | internal | positive | Y |
100/250 | −0.766/0.913 | internal | positive | Y |
300/250 | −0/612/0.901 | |||
0.01/f2 | 0.942/0.918 | external | / | N |
50/ f2 | 0.937/0.922 | external | / | N |
100/ f2 | 0.926/0.911 | external | / | N |
0.01/f3 | 0.954/0.947 | external | / | N |
50/ f3 | 0.946/0.932 | external | / | N |
100/ f3 | 0.928/0.915 | external | / | N |