Final Check - GE Agile P50 Series Technical Manual

13 Commissioning Instructions
2. Check that the current transformer polarities are correct by measuring the negative sequence
current magnitude. or derived earth fault current.
3. Ensure the current flowing in the neutral circuit of the current transformers is negligible.
4. Compare the values of the secondary phase currents with the measured values, which can be
found in the MEASUREMENTS menu.
The 'Secondary' values displayed on the relay should be equal to the applied secondary current. The
values should be within 2% of the applied secondary Current. However, an additional allowance must
be made for the accuracy of the test equipment being used.
2.1.13

Final check

1. Remove all test leads and temporary shorting leads.
2. If you have had to disconnect any of the external wiring in order to perform the wiring
verification tests, replace all wiring, fuses and links in accordance with the relevant external
connection or scheme diagram.
3. Ensure that the IED has been restored to service by checking that the Test Mode cell in the
COMMISSION TESTS menu is set to 'Disabled'.
4. The settings applied should be carefully checked against the required application-specific
settings to ensure that they are correct, and have not been mistakenly altered during testing.
5. Ensure that all protection elements required have been set to Enabled in the
CONFIGURATION menu.
6. If the IED is in a new installation or the circuit breaker has just been maintained, the circuit
breaker maintenance and current counters should be zero. These counters can be reset using
the Clear Maint function in the RECORD CONTROL menu.
7. If the required access level is not active, the device will prompt for a password to be entered
so that the setting change can be made.
8. If a P991/MMLG test block is installed, remove the P992/MMLB test plug and replace the
cover so that the protection is put into service.
9. Ensure that all event records, fault records, disturbance records, alarms and LEDs and
communications statistics have been reset.
Note:
13-8
Clear Maint function will clear all Maintenance record memory
P50 Agile P153
P153/EN M/B