Phase Failure and Sequence Protection Relay
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In three phases system, When phase sequence and phase voltage are all normal, the OUT light is turned on, relay contact is energised; When there is failure of any one phase or phase sequence errors, the OUT light is off, the relay de-energizes its contact.
When Phase sequence errors, the OUT light is off, the relay de-energizes its contact.
(asym.% ) ( fixed 40% for phase-neutral ) Phase to neutral asymmetry is fixed 40%. If asymmetry exceeds this value, the OUT light is off and the Relay de-energizes its contact. To return normal state, voltage asymmetry value must be under 15% (hysteresis)