Areva MiCOM P125, Technical Manual

Page: 357 / 362

Commissioning Test and Record Sheet P12y/EN RS/D32
MiCOM P125/P126 & P127 Page 45/48
3.8.2 Phase to neutral under voltage element
Test with the following relay settings:
•
U< 50V
Enable stage 1 over voltage and apply rated three phase voltages (57.7V per phase) to the
relay. After 2s reduce the phase A voltage and phase B voltage to 20V. Measure the
operating times of the relay start and trip contacts. Repeat the test with the element disabled
and verify that no start or trip elements operate.
Repeat the above tests for stage 2 under voltage.
3.8.3 Over voltage
Object:
To verify that over voltage starts and trips applied to the relay operate correctly.
Test with the following relay settings:
•
Mode OR
•
Characteristic DT
•
DT 10s
3.8.4 Phase to neutral over voltage element
Test with the following relay settings:
•
U>100V
Enable stage 1 and apply three phase voltages (50V per phase) to the relay. After 1s
increase the phase A voltage and phase B voltage to 60V. Measure the operating times of
the relay start and trip contacts. Repeat the test with the element disabled and verify that no
start or trip elements operate.
Repeat the above testing for stage 2 overvoltage.
3.8.5 Residual over voltage
Object:
The following tests verify that residual over voltage starts and trips applied to the relay are
recorded as fault records.
Test with the following relay settings:
•
Ue Derived (VT Connection setting 3Vpn)
•
Ue>>>> 10V
•
Trip Delay 10s
Enable stage of the residual overvoltage protection and apply balanced three phase voltages
to the relay (57.7V per phase) after 2s reduce UA phase voltage to 25V . Measure the
operating times of the relay start and trip contacts. Repeat the test with the element disabled
and verify that no start or trip elements operate.
3.8.5.1 Pass Criteria
For the relay to pass it shall operate as detailed below.