Neutral Earthing Resistors

Reducing single phase fault currents which occur in M.V. electrical networks to prevent damages on transformers and generators. Reducing temporary over voltages occurred by braking instantaneous fault current. Providing long-life for switchgear. Reducing step voltages to a harmless level for staff.

Operation Voltage	:	Up to 72 kV line to line systems
Rated Current (A)	:	Up to 5000
Ambient Temprature (ºC)	:	<50
Resistance Alloy	:	Stainless Steel
Protection Degree	:	P 23(outdoor) and others
Standards	:	EEE 32, EN 60137, EN ISO 1461, EN 60298, EN6 0273, EN 60071, EN 60060

Neutral Grounding Resistors are used for resistance earthing of industrial power system. They are generally connected between ground and neutral of transformers, generators and grounding transformers. Neutral earthing Resistors are used in order to limit maximum fault current to a value which will not damage the equipment in the power system, yet allow sufficient flow of fault current to operate protective relays to clear the fault. Although it is possible to limit fault currents with high resistance Neutral Earthing Resistors, earth short circuit currents can be extremely reduced. As a result of this fact, protection devices may not sense the fault. Therefore, it is the most common application to limit single phase fault currents with low resistance Neutral Grounding Resistors to approximately rated current of transformer and / or generator.