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.
Earth fault relay wiring diagram.
Hence the name restricted.
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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.
The relay is designed for sensing the fault current which is 15 more than that of the rated winding current.
Such settings protect a restricted portion of the winding.
At least one relay will operate for fault involving two phase.
The earth fault relay must be very sensitive for sensing the fault.
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.
The earth fault relay operates only for the internal fault of the protective zone.
Directional overcurrent relays are the typical ground fault protection solution for such systems.
For fault involving ground reliance is placed on earth fault relay.
With the protection scheme as shown.
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This is an economical version of 3 o l and 1 e l type of protection as one overcurrent relay is saved.
Restricted earth fault protection of transformer.
The earth fault protection scheme consists of the earth fault relay which gives the tripping command to the.
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