Answer / viraj

normally above voltage 10kv called voltage source
their are of two types
1.system generated
when ckt connected or disconnected
2.lightning
lightning stroke over the current caring conductor.
surge current means inrush current
it takes 5 to 10 times current when instrument starts for first time

Answer / sarmadahmed

Surge current is the faulty current produced due to some short circuit and is capable of burning the equipment so earthing is used to provide it a low resistant path for grounding.
Surge current means an instantaneous current of very high amplitude.
Surge voltage would be in case of open circuit condition.

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