Fault

location

Transition resistance/(˚)

Fault initial angle

Fault distance

Transition resistance Ω

Decision result

Line, L1, L2, L3, L4

AG

ABG

BC

ABC

45˚

Distance from bus M 20 km

80

External

External

External

External

Bus M

AG

ABG

BC

ABC

45˚

200

Internal

Internal

Internal

Internal