14.3 SCHEME TESTING
14.3.1 SIGNAL SEND TEST FOR PERMISSIVE SCHEMES
1. Reconnect the test set so that the timer is no longer stopped by the Trip contact, but is now stopped by the
Signal Send contact (the contact that would normally be connected to the pilot/signalling channel).
2. Repeat the forward fault injection, and record the Signal Send contact operating time. The measured
operating time should typically be less than 40 ms.
3. Switch OFF the AC supply and reset the alarms.
14.3.2 SIGNAL SEND TEST FOR BLOCKING SCHEMES
1. Reconnect the test set so that the timer is no longer stopped by the Trip contact, but is now stopped by the
Signal Send contact. This is the contact that would normally be connected to the pilot/signalling channel.
2. Reverse the current flow direction on the A phase to simulate a reverse fault.
3. Perform the reverse fault injection and record the signal send contact operating time. The measured
operating time should typically be less than 40 ms.
4. Switch OFF the AC supply and reset the alarms.
Caution:
When the tests are completed, restore all settings that were disabled for testing
purposes.
Caution:
Remove any wires or leads temporarily fitted to energise the channel receive opto-
input.
P543i/P545i Chapter 25 - Commissioning Instructions
P54x1i-TM-EN-1 679
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