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4.5 PQSensor™ Installation wiring check
When the CVT is energised it is not possible to gain access to the CVT secondary terminal box
so the wiring must be checked and tested before energisation. To facilitate testing apply a suit-
able supply voltage to the SCM. Next, using a secondary injection test set inject the Reference
Test Current as given in the PQSensor™ test report between the ‘Test’ terminal (5) on the MU
and ground and measure the PQSensor output voltage. The output voltage should be within
2% of the Nominal Output Voltage as given in the SCM Test Report. If the measured voltage is
outside tolerance then the installation wiring should be checked as this is the most likely cause
of the output voltage error.
4.6 Site Calibration Of a PQSensor™ retro-fitted to an existing installed CVT
Using a calibrated voltmeter measure the output voltage of the SCM while the CVT is energised.
The output voltage should be equal to the Nominal Output Voltage as given by the PQSensor™
Test Report. If required use the output adjust potentionmeter to correct for any difference.
Where the substation primary voltage differs from nominal voltage the expected PQSensor™
output voltage can be scaled accordingly.
When testing is complete record the substation voltage and output voltage on the results label
provided inside the PQSensor™.
4.7 Site Verication For a Factory Calibrated PQSensor™
For a factory calibrated PQSensor™ no site calibration is required as this will have been com-
pleted by the CVT manufacturer. However the output voltage value should be checked after the
CVT has been energised.
Where the substation primary voltage differs from nominal voltage the expected PQSensor™
output voltage can be scaled accordingly.
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