Earth Fault Relay Wiring Diagram

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Earth fault relay wiring diagram.

An external fault in the star side will result in current flowing in the line current transformer of the affected phase and at the same time a balancing current flows in the neutral current transformer hence the resultant current in the relay is therefore zero so this ref relay will not be actuated for external earth fault. The earth fault relay must be very sensitive for sensing the fault. Hence the name restricted. The relay is designed for sensing the fault current which is 15 more than that of the rated winding current.

The earth fault protection scheme consists of the earth fault relay which gives the tripping command to the. A current of approxi mately 125 percent of the pickup setting of the relay divided by the number of turns is passed through the wire to simulate the ground fault current. 2 no o c relay 1 no e f relay for over current and earth fault protection. Best bosch relay wiring diagram 5 pole electrical outlet symbol 2018.

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Window type sensor supplying a ground fault relay a num ber of turns of wire are wrapped around the sensor core such as twenty turns of 14 wire. The earth fault can be dispersed by using the restricted earth fault protection scheme. However high impedance ground fault detection is difficult in multigrounded four wire systems in which the relay measures the ground fault current combined with the unbalance current generated by line phasing and configuration and load unbalance. At least one relay will operate for fault involving two phase.

This is an economical version of 3 o l and 1 e l type of protection as one overcurrent relay is saved. Hvac fan relay wiring diagram download. The earth fault relay operates only for the internal fault of the protective zone.