An earth switch in a substation has the ability to create short circuits in order to safeguard other electrical devices from damage. Examples are the high voltage earthing switch and the high speed grounding switch. They are designed to withstand short circuits they can also be motorized.
They protect technicians and staff when there is an abnormal current. An earthing switch is usually used to discharge the charge.Įarthing switches have a snap action closing mechanism. A residual charge always remains in the circuit after it has been severed or opened by the circuit breaker and isolator. For isolators, the earthing switches make contact with the bus bar when the isolator isolates the circuits, discharging any charges that may have gathered there.Īn earth switch in switchgear is used to ground the remaining change in a power line after the power line has been removed from its source. When circuit breakers are removed and racked out, earthing switches automatically ground the part of the bus bar adjacent to the circuit breakers. It’s a protective device that’s included in switchgear components like circuit breakers and isolators.
Earthing switch and grounding switch are used interchangeably. An earthing switch is also known as a grounding switch.
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