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7. Putting Relay into Service
The following procedure must be adhered to when putting the relay into service after finishing the
commissioning tests or maintenance tests.
• Check that all the external connections are correct.
• Check the settings of all measuring elements, timers, scheme switches, recordings and clock
are correct.
In particular, when settings are changed temporarily for testing, be sure to restore them.
• Clear any unnecessary records on faults, alarms, events, disturbances and counters which are
recorded during the tests.
• If dc power has not been supplied to the relay for two days or more, then internal clock may be
cleared soon after restoring the power. This is because the back-up RAM may have discharged
and may contain uncertain data. Set the internal clock again.
• Press the VIEW
"Auto-supervision" screen.
• Check that the green "IN SERVICE" LED is lit and no other LEDs are lit on the front panel.
Whilst the relay is put into service at one terminal by supplying DC power and not yet at the other
terminal, a communication failure will be detected by the automatic monitoring at the in-service
terminal and a red "ALARM" LED is lit. But it will be reset when the relays are put into service at
all terminals.
key and check that no failure message is displayed on the
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