RFL 9300 RFL Electronics Inc.
October 20, 2004 8 - 17 (973) 334-3100
8.2.3.5 BACKUP TRIPPING, HIGH-SET OVERCURRENT
The RFL 9300's backup tripping modes (High-Set Overcurrent, Loss-Of-Load, and Switch-Into-Fault) become
operative if the received channel signal is lost and
Parameter #27 (BACKUP) is enabled. The following proce-
dure verifies the high-set overcurrent function. The loss-of-load and switch-into-fault tripping modes are more
difficult to test, and are beyond the scope of this procedure.
1. Temporarily lower the phase and ground backup settings to levels that are easy to test (such as
10 amperes phase and 7 amperes ground).
2. Disable the communications channel by disconnecting the incoming communications link.
The RFL 9300 will go into a BACKUP ENABLE condition, and its red BACKUP
indicator will light.
3. Inject test current into Phase A and ground, using the circuit shown in Figure 8-2.
4. Increase the test current.
At the ground overcurrent backup setting (7 amperes), the RFL 9300 backup
should trip on G and its G target indicator should light. At 10 amperes, the RFL
9300 also should trip on Phase A, and its A target indicator should light.
5. (optional) Test the other phases to verify the backup high-set overcurrent tripping level.
6. Return the overcurrent backup settings to the default values (31.87 amperes phase and 31 am-
peres ground).
The single-relay tests are now complete. To return the RFL 9300 to normal operation, proceed as follows:
1. Make sure the power switch on the RFL 9300's power supply is in the off ("0") position.
2. Reconnect the wires to the BREAKER TRIP and DTT TRIP terminals on rear-panel terminal
blocks TB2 and TB3 that were disconnected during the familiarization procedure.
Use the tags placed on the wires when they were disconnected as a guide when
reconnecting them.
3. Disconnect the twisted pair, cable and DCE emulator, or fiber optic patchcord that was con-
nected between the transmit output and the receive input during the familiarization procedure.
4. Reconnect the communication lines that were disconnected during the familiarization proce-
dure.
Use the tags placed on the wires when they were disconnected as a guide when
reconnecting them.
5. Place the power switch on the RFL 9300's power supply in the on ("1") position.
The three green indicators on the front of the power supply will light, and the RFL
9300 will start to initialize. After a few seconds, the green P-P and BER OK indica-
tors on the 93B CC module will light, and the PROTECTION indicator on the 93B
DISPLAY module will light green. A pair of dots will move across both lines of the
display, from left to right.
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