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Q3 (b) If a University 33kV Feeder line maximum load current is 340A and a 3400A...

Q3 (b)
If a University 33kV Feeder line maximum load current is 340A and a 3400A phase to earth fault current occurred at the main gate.
(i) Design a simple protection system to protect the feeder line showing all the major components of protection system.

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Answer #1

i) Figure below shows the simple protecion system for feeder lines that consists of current transformers to stepdown the current in the high voltage feeder lines and phase relays or over current relays to provide over current potection and finally earth fault relays to protect the line from earth faults.

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