GE P24DM Technical Manual

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If the Local Values cell is set to Secondary, the values displayed should be equal to the applied secondaryvoltage. The values should be within 1% of the applied secondary voltages. However, an additional allowance mustbe made for the accuracy of the test equipment being used.If the Local Values cell is set to Primary, the values displayed should be equal to the applied secondary voltagemultiplied the corresponding voltage transformer ratio set in the CT AND VT RATIOS column. The values should bewithin 1% of the expected values, plus an additional allowance for the accuracy of the test equipment being used.8.3 ON-LOAD DIRECTIONAL TESTThis test ensures that directional overcurrent and fault locator functions have the correct forward/reverseresponse to fault and load conditions. For this test you must first know the actual direction of power flow on thesystem. If you do not already know this you must determine it using adjacent instrumentation or protectionalready in-service.● For load current flowing in the Forward direction (power export to the remote line end), the A Phase Wattscell in the MEASUREMENTS 2 column should show positive power signing.● For load current flowing in the Reverse direction (power import from the remote line end), the A PhaseWatts cell in the MEASUREMENTS 2 column should show negative power signing.Note:This check applies only for Measurement Modes 0 (default), and 2. This should be checked in the MEASURE’T SETUP column(Measurement Mode = 0 or 2). If measurement modes 1 or 3 are used, the expected power flow signing would be opposite tothat shown above.In the event of any uncertainty, check the phase angle of the phase currents with respect to their phase voltage.P24xM Chapter 19 - Commissioning InstructionsP24xM-TM-EN-2.1 417