ABB REL 356

ABB REL 356 Current Differential Protection
5-3
Testing
Relay Output Subsystem Test
Using the procedure described in Section 2 “Relay Output Test”, verify operation of relay output subsystem. The relay
contact wiring is shown on Block Diagram. Please note that the Failure Alarm Relay (TB4, 5-6) has a normally closed
contact.
Communication Subsystem Test
9600 bps Audio Tone Option
Make the following test connection on the rear of the relay:
TB4-11 to TB4-13
TB4-12 to TB4-14
This connects the Communication XMT pair to RCV pair.
STEP 1
Make sure that 52b contact input (TB-5 terminals 1-2) is de-energized.
Change the “OPBR” setting to “52B” to disable the open breaker code transmission. Change the “ALDT” setting to “NO”
since automatic delay time measurement is not possible with communication channel in a “Loopback” configuration.
Turn the dc supply connected to the REL 356’s dc (Battery) inputs “off” for 1 second & then back “on” again to re-initialize
the modem’s “ALDT” setting on power-up sequence.
Change the “XMTR” setting to “-1” dBm. Press the “DISPLAY SELECT” key on REL 356 front panel several times to
select the “VOLTS/AMPS/ANGLE” mode. Use the FUNCTION RAISE/LOWER keys to display the “XMTR” monitoring
function. The transmitter output level is measured via the “XMTR” monitoring function should read between +2 an -5
dBm.
Change the “XMTR” setting to “-11” dBm. The transmitter output level as measured via the “XMTR” monitoring function
should read between -8 and -15 dBm.
Change the “XMTR” setting back to “-1” dBm. Use the “CHRX” monitoring function for indication of the Channel receiver
line status, “CHRX” should read “NORM”.
STEP 2
Temporarily disconnect the XMT to RCV jumper TB4-11 to TB4-13. The display CHRX should change to CHTB (Channel
Trouble).
STEP 3
Reconnect TB4-11 to TB4-13. The display CHRX should return to NORM after a short time delay.
56/64 KPBS Digital Communication Option
Make following Loopback connections on digital Communication Interface on the rear of the relay.
DIX L• Fiber Optic Version (820 nm)
Using 50/100 mm or larger Multi Mode Cable with ST connectors at each end, connect Fiber Optic Transmitt-
er to Fiber Optic Receiver.
• Fiber Optic Version (1300 nm)
Using 9/125 mm, Single Mode Cable with ST connectors at each end, connect Fiber Optic Transmitter to Fiber
Optic Receiver.