Loading Neutral Grounding Resistors

Product Description

This Type of Eathing system is used when High Resistance grounding is required. This type of NGR is mostly used in Generator Earthing. Fault Current rating of such system is 5-10AThis type of system is used where continuous operation is required though falut is occured.In this system, a single phase distribution transformer is used in conjunction with a loading resistor, to provide high resistance grounding.It allows the system to operate like an ungrounded system under normal operating conditions, while still retaining the ability to limit fault currents during a fault condistions.The primary of the transformer is connected from the system neutral to ground. The loading resistor is connected across the transformer secondary.When a ground fault occurs downstream of the grounding transformer, ground fault current flows through the fault, back through ground to the grounding transformer.The loading resistor limits the current flow in the secondary winding, which in turn limits the flow of the ground fault current upto 5A to 10A back into the system through the primary of the grounding transformer as per customer requikrement. Value of Loading Resistor in Secondary circuit is calculted on the basis of how much fault current is required & system voltage.The transformer primary voltage rating should be the same as the system line-to-line voltage or line-to-Neutral voltage. The secondary voltage is normally 240 or 110 volts.