Frequency Reading Not Displayed During Testing

Issue:

The P3 relay does not show frequency readings during a real or virtual injection test.

Product:

PowerLogic™ P3 Relay

Environment:

Testing scenario using virtual or secondary voltage injection.

Cause:

The frequency is not measured if:

• The maximum of the three phase-to-phase or phase-to-neutral voltages is less than 5.5 × (VT primary / VT secondary) (primary voltage reference).
• The secondary voltage injection is less than 5.5 V.

This is a design condition to ensure accurate frequency measurement.

Resolution:

Increase the magnitude of the injected voltage during the virtual injection test. After raising the voltage above the required threshold, the frequency readings will appear as expected.

Đã phát hành cho: Schneider Electric Việt Nam