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Substation Equipment: Grounding Resistors

Grounding Resistors
Grounding Resistors are designed to provide added safety to industrial distribution systems by limiting ground fault current to reasonable levels. They are usually connected between earth ground and the neutral of power transformers, power generators or artificial neutral transformers. Their main purpose is to limit the maximum fault current to a value which will not damage generating, distribution or other associated equipment in the power system, yet allow sufficient flow of fault current to operate protective relays to clear the fault.

Figure 1. Grounding resistor
Figure 1. Grounding resistor
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