VPD-02R  Phase Failure and Phase Sequence Relay

♥Constant Voltage Asymmetry (Phase – Neutral 40%)

 General :

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 default phase or phase sequence errors,the OUT light is off, the

relay de-energizes its contact.

Phase Failure :

When Default phase,the OUT light is off, the relay de-energizes its contact.

Phase Sequence:

When Phase sequence errors,the OUT light is off, the relay de-energizes its contact.

Voltage Asymmetry:

(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).