Discussion
Possible faults that may occur on a transmission line are
a. 3 phase fault
b. L-L-G fault
c L-L fault
d. L-G fault
The decreasing order of severity of the fault from stability point of view is
Answer: A
The decreasing order of severity is a-b-c-d: three phase, L-L-G, L-L, L-G.
From the stability point of view, a fault is more severe the more it reduces the power that can be transferred across the system during the fault. A three phase fault brings the transfer close to zero. A double line to ground fault reduces it the most of the unsymmetrical faults, a line to line fault less, and a single line to ground fault, the commonest fault, the least.
The other orders place the single line to ground fault or the line to line fault above the double line to ground fault, which reverses the effect of the fault on power transfer.
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