The measurement accuracy of the IED is +/- 1%. However, an additional allowance must be made for the
accuracy of the test equipment being used.
5.2.14 TEST VOLTAGE INPUTS
This test verifies that the voltage measurement inputs are configured correctly.
1.
Apply rated voltage to each voltage transformer input in turn
2. Check its magnitude using a multimeter or test set readout. The corresponding reading can then be
checked in the MEASUREMENTS 1 column.
3. Record the value displayed. The measured voltage values will either be in primary or secondary Volts.
If the Local Values cell in the MEASURE’T SETUP column is set to 'Primary', the values displayed
should be equal to the applied voltage multiplied by the corresponding voltage transformer ratio (set in
the CT AND VT RATIOS column). If the Local Values cell is set to Secondary, the value displayed
should be equal to the applied voltage.
Note:
If a PC connected to the IED using the rear communications port is being used to display the measured current, the
process will be similar. However, the setting of the Remote Values cell in the MEASURE’T SETUP column will
determine whether the displayed values are in primary or secondary Amperes.
The measurement accuracy of the IED is +/- 1%. However, an additional allowance must be made for the
accuracy of the test equipment being used.
MiCOM P747 Chapter 14 - Commissioning Instructions
P747-TM-EN-1 357
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