Fullde neutral earthing resistor iec standard:
Neutral Earth Resistors (NER) protect equipment from damage in the event of earth faults. They do this by limiting the current that flows through the neutral point of a transformer to a safe level so as prevent damage to equipment but still operate protection devices. Neutral Earth Resistors can be used to protect critical equipment including switchgear, generators and transformers.
When is earth fault limiting right for you ? Do i need an NER ?
1.Electrical faults and damage to equipment due to high earth return currents
2.Risk of electrical shock and arc flash hazards to personnel and equipment
3.Interference in telecommunications equipment due to high earth return currents
4.Production losses due to unplanned downtime
5.High maintenance requirements and expenses due to ageing equipment
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