Test Ethernet Communication; Secondary Injection Tests; Test Current Inputs; Test Voltage Inputs - GE P4A Technical Manual

Chapter 20 - Commissioning Instructions
5.2.12

TEST ETHERNET COMMUNICATION

For products that employ Ethernet communications, we recommend that testing be limited to a visual check that
the correct ports are fitted and that there is no sign of physical damage.
If there is no board fitted or the board is faulty, a NIC link alarm will be raised (providing this option has been set in
the NIC Link Report cell in the COMMUNICATIONS column).
5.3

SECONDARY INJECTION TESTS

Secondary injection testing is carried out to verify the integrity of the VT and CT readings. All devices leave the
factory set for operation at a system frequency of 50 Hz. If operation at 60 Hz is required, you must set this in the
Frequency cell in the SYSTEM DATA column.
The PMU must be installed and connected to a 1pps fibre optic synchronising signal and a demodulated IRIG-B
signal, provided by a device such as a P594 or a REASON RT430.
Connect the current and voltage outputs of the test set to the appropriate terminals of the first voltage and current
channel and apply nominal voltage and current with the current lagging the voltage by 90 degrees.
5.3.1

TEST CURRENT INPUTS

This test verifies that the current measurement inputs are configured correctly.
1. Using secondary injection test equipment such as an Omicron, apply and measure nominal rated current to
each CT in turn.
2. Check its magnitude using a multi-meter or test set readout. Check this value against the value displayed
on the HMI panel (usually in MEASUREMENTS 1 column).
3. Record the displayed value. The measured current values will either be in primary or secondary Amperes. If
the Local Values cell in the MEASURE'T SETUP column is set to Primary, the values displayed should be
equal to the applied current multiplied by the corresponding current 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 current.
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.
5.3.2

TEST VOLTAGE INPUTS

This test verifies that the voltage measurement inputs are configured correctly.
1. Using secondary injection test equipment, apply and measure the rated voltage to each voltage
transformer input in turn.
2. Check its magnitude using a multimeter or test set readout. Check this value against the value displayed on
the HMI panel (usually in 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.
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P54A/B/C/E
P54xMED-TM-EN-1