Over voltage happens in light of the increment in the speed of the prime mover because of sudden loss in the burden on the generator. Generator over voltage does not happen in the turbo generator in light of the fact that the control governors of the turbo generators are extremely touchy to the speed variety. Anyway the over voltage insurance is needed for the hydro generator or gas turbine generators. The over voltage assurance is furnished by two over voltage transfers have two units – one is the immediate transfers which is situated to get at 130 to 150% of the evaluated voltage and an alternate unit is IDMT which is situated to get at 110% of evaluated voltage. Over voltage might happen because of the inadequate voltage controller and additionally because of manual control errors
Under voltage security:
If more than one generators supply the burden and because of some excuse for why one generator is abruptly outing , then an alternate generators attempt to supply the load. Each of these generators will experience a sudden build in current and subsequently diminishes the terminal voltage. Immediate voltage controller joined with the framework attempt to restore the voltage. What's more under voltage relay type-27 is likewise utilized for the under voltage insurance.
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