Neutral Grounding Resistor

Neutral Grounding Resistor

NGR / NER is used to ground the neutral of Transformer / Generator to limit prospective ground fault current to a predetermined safe value. The NGR avoids transient over voltage and gives system stability under fault conditions.

Technical specification:

  • Range : 230 V to 66 kV / 8000A
  • Degree of protection : IP00 to IP65
  • Service : Indoor / Outdoor / Suitable for Highly polluting and corrosive atmosphere
  • Enclosure Finishing : Epoxy powder coat painted / Galvanized / Stainless steel (AISI 304 / 316)
  • Mounting type : Floor / Steel Structure Mounted
  • Duration : 5/10/15/30/60 Sec or Continuous
  • Frequency : 50 / 60 Hz
  • Standard followed : IEEE - 32
  • Termination : Through outdoor porcelain bushing/ cable box
  • Types of elements used : Stamped plates / Wire wound / Frame wound / Cast Iron / Edge wound
  • Resistive elements : Stainless steel (Cr – Ni) / Cr – Al alloy (AISI 416)
  • Optional accessories : CT / Monitoring Relay / Protection Relay / Space heaters / Vacuum contactor / Disconnector (Motorized/Manual) for Isolation or Changeover/ Zig zag Transformers
  • Generator Protection : Single or multiple Generators with Interlock / High resistance Grounding / Through Neutral Grounding Transformers / Disconnector or vacuum contactor Up to 11 kV
  • Maximum Temperature : 790°C
  • Ambient Temperature : 55°C