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In the UVR(Under Voltage Relay) there is a knob for the
hysteresis setting. what is this setting? its threshold is
given from 5% to 50%. please help me....
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Answer Posted / k.prakashchandra
It should have given in the manual supplied with the
relay.It seems that it is the setting for % drop in
voltage.It is important to set the time delay also.The delay
should not be less than the time taken by any CB of the
power supply system, to clear the fault to prevent tripping
on under voltage due to temporary fault anywhere in the
supply network
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