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