substation equipment
in every electrical substation, there generaly virous indoor and outdoor switchgear equipment. each equipment has certain functional requirement :
- isolator are "disconnecting switches which can be used for disconnecting a circuit breaker. an isolator can be opened after the circuit breaker
- after opening the isolator, the earthing switch can be closed to discharge the trapped electrical charges to ground
- current transformer (CTs) and potential transformer (PTs) are used for transforming the current and the voltage to lower values for the purpose of measurement, protection, and control
- lighting arresters ( surge arresters ) divert the over voltage to earth and protect the substation equipment from ove over voltage
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