Neutral Grounding Resistors Review

Electronic Electrical Devices

Neutral Grounding Resistors are incorporated into electrical circuits to protect the system and devices. Neutral grounding resistors protect electrical circuit components by limiting the ground fault current to an acceptable level.

Within three phase electric voltage system, the neutral branch is referenced to ground (earth). In the event that a current fault occurs (short to ground), extreme current causes by the fault will damage electrical circuit system and components. By installing a neutral grounding resistor, the faulty current will be limited to a predetermined level.

A properly designed high resistance grounded electrical system:

• Protects both ungrounded and solidly grounded systems
• Allows the electrical system to run with a single ground fault on the system, or in the case of a fault allows the shut down in an orderly manner
• Will prevent transient overvoltages and limits voltage fluctuation at the neutral during a ground fault
• Minimizes the risk of arc flash and arc blast on the first ground fault
• Limits energy available to a ground-fault fault • Provides current to current-sensing ground-fault protection