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Phase Sequence, 3Ø Under, Over and Voltage unbalance with adjustable time delay & selectable voltage.
The W-PR3 Phase Protection Relay is a digital electronic instrument designed for AC voltage monitoring and protection in 3 phase 4 wire and 3 phase 3 wire system. Used in application such as main failure, phase sequence, phase unbalance, under and over voltage. The W-PR3 is a designed to monitor the correct phase sequence of 3 phase system (L1, L2, L3). With correct phase sequence applied the output relay will energizes (N/O) and remains de-energized (N/C) if an incorrect sequence is applied, the display will show “Pr”.
Operating System with “Over voltage”: When the measured voltage moves outside the set-point limit, the relay will count the time for “Delay off”, then the relay will de-energize (N/C) after the time delay. The relay will automatically reset to energize (N/O) after it’s reached the time set-point (Delay On).
Operating System with “Under voltage”: When the measured voltage moves outside the set-point limit, the relay will count the time for “Delay off”, then the relay will de-energize (N/C) after the time delay. The relay will automatically reset to energize (N/O) after it’s reached the time set-point (Delay On).
Operating System with “Unbalance voltage”: When the measured voltage moves raised and reduced the set-point limit, the relay will count the time for “Delay off”, then the relay will de-energize (N/C) after the time delay. The relay will automatically reset to energize (N/O) after it’s reached the time set-point (Delay On).