| Fault location | Transition resistance Ω | Fault initial angle/(˚) | Fault distance | fault type | Decision result |
| Line, L1, L2, L3, L4 | 0 200 500 800 | 45˚ | Distance from bus M 100 km | BC phase short to ground | External External External External |
| Bus M | 0 200 500 800 | 45˚ |
| Phase an earth fault | Internal Internal Internal Internal |