Tests and Diagnostics
GARD 8000 SYS RFL Electronics
February 14, 2011 11-52 973.334.3100
Address Fail
When red this indicates that the address received from the remote relay (set via the transmit address
setting on the remote relay) does not match the setting for the received address at the local relay. No
protection messages are passed between relays unless the addresses match. Green indicates the
addresses are correct.
Received Address
This displays the received address from the remote relay (which must match the local settings for
receive address). It is displayed to help diagnose addressing problems, which may be caused by
network misconnections.
Relay Configuration Mismatch
There are a number of key setup and configuration parameters that need to be the same on both ends of
the line being protected. The current diff relay compares these parameters and if they do not match
this indicator is set to red. When they match the indicator is set to green.
The parameters that must match include:
50 Hz /60 Hz line
Two-terminal / three terminal relay configuration
Single-pole / three-pole configuration
The local and remote CT factor settings in both relays must agree
Pong-Pong Alarm
When red this indicates that the ping-pong measurements made by the local and remote relay do not
match. The ping-pong is a bidirectional measurement and should provide the same result when either
relay initiates the test. If the two measurements differ by more than 3 ms the error flag is set.
Green indicates the ping-pong tests are the same.
Comms Alarm
When red this indicates an alarm condition in the communications channel. Green indicates the
absence of an alarm condition.
Comms Failure
When red this indicates a failure in the communications channel. Green indicates the absence of a
failure condition.
Guard Before Trip Not Satisfied
When red this indicates that the guard before trip criteria has not been satisfied and the relay will not
trip in primary protection mode. Green indicates that either the criteria have been satisfied or guard
before trip has been disabled by the user.
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