Neutral Earthing Resistors (also known as neutral grounding resistors in US influenced regions) are a key component in earth fault protection of medium voltage electricity generation and distribution systems.
Cressall NERs limit the current that would flow through the neutral point of a transformer or generator in the event of an earth fault.
Features of Cressall earthing resistors include:
Any current or voltage rating
Compliance with IEEE C57.32a (2020), Terminology and Test Procedure for Neutral Grounding Devices (formerly IEEE-32)
Stainless steel resistors and enclosures as standard, IP23 to IP56.
Type-tested standard designs (certificates available)
Supply of resistor banks only for incorporation into customer’s own enclosures
Shock-tested marine designs
Provision for CTs, heaters, special cabling, etc.
Interlocked off-load by-pass isolators
Single or multiple vacuum contactors
High resistance grounding resistors (for use where regulations permit, e.g. some offshore installations)
DISCOVER THE FULL RANGE OF CRESSALL NEUTRAL EARTHING RESISTORS