Neutral Earthing Resistor Theory

Ners sometimes called neutral grounding resistors are used in an ac distribution networks to limit transient overvoltages that flow through the neutral point of a transformer or generator to a safe value during a fault event. High resistance grounding of an electrical power system is the grounding of the system neutral through a resistance which limits ground fault current to a value equal to or slightly greater than the capacitive charging current of that system.

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If the neutral of the transformer has solid ground a high current will flow through the winding of the transformer and it can damage the transformer.

Neutral earthing resistor theory. Zero sequence current transformers and ground fault relays will detect the fault and alarm at 10 to 20 of the maximum ground fault current. During unbalancing the fault current flows through neutral to ground. Also called neutral grounding resistors they limit the current that would flow through the neutral point of a transformer or generator in the event of an earth fault.

A widely utilised approach to managing fault currents is the installation of neutral earthing resistors ners. Neutral earthing resistor systems protect power transformers and generators from damaging fault currents. What is a neutral earthing resistor.

Neutral grounding resistors ngrs limit the fault current when one phase of the system shorts or arcs to ground. The resistor is rated for continuous duty with a maximum temperature rise of 375 0c. In the event that a ground fault condition exists the ngr typically limits the current to 200 400a though most resistor manufacturers label any resistor that limits the current to 25a or greater as low resistance.

The neutral grounding resistor will limit the ground fault to a maximum of 5 to 10 a. It is manufactured in our advanced manufacturing unit by our professionals utilizing premium quality raw material and latest tools and technology. The neutral grounding resistor is used to limit the fault current in the star connected winding.

Neutral earthing resistors ners are one of the commonest types of earthing systems in medium voltage ac distribution networks. Earthing of the neutral limits the ground fault current to a high level typically 50 amps or more in order to operate protective fault clearing relays and current transformers. Offering best quality neutral grounding resistors online use for generators and transformers preventing any fault in earth wire owing to rich domain knowledge we bring forth an excellent range of grounding resistor.

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