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What is a Neutral Earthing Resistor? - Captech

Fact SheetPage 1 Neutral Earthin ResistorNov 2015 The Earthing system plays a very important role in an electrical network. For network operators and end users, avoiding damage to equipment , providing a safe operating environment for personnel and continuity of supply are major drivers behind implementing reliable fault mitigation is a Neutral Earthing Resistor? A widely utilised approach to managing fault currents is the installation of Neutral Earthing resistors (NERs). 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 connected between ground and Neutral of transformers, NERs reduce the fault currents to a maximum pre-determined value that avoids a network shutdown and damage to equipment , yet allows sufficient flow of fault current to activate protection devices to loca

Low resistance grounding is used in large MV/HV electrical networks where there is a high level of capital equipment and network interruptions have a significant economic impact. These NERs are generally sized to permit only 200A to 2500A of …

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