173
6
F
2
S
0
8
3
4
If a data failure occurs between the local terminal and remote terminal 1 and lasts for ten seconds,
failure alarms "Com1 fail" and "Com1 fail-R" are issued at the local and remote terminals
respectively. "Com1 fail" is a failure detected by the local terminal relay, and "Com1 fail-R" is a
failure detected by the remote terminal relay. If the failure occurs between the local terminal and
remote terminal 2, "Com2 fail" and "Com2 fail-R" are issued.
Note: The remote terminal 1 and 2 are those with which the local communication port 1
(CH1) and 2 (CH2) are linking with.
In the case that the GRZ100 is linked directly to a dedicated optical fiber communication circuit,
sending and receiving signal levels are monitored and error messages "TX1 level err" of CH1 or
"TX2 level err" of CH2 for sending signal and "RX1 level err" of CH1 or "RX2 level err" of CH2
for receiving signal are output when the levels fall below the minimum allowed.
In the communication setup in which the GRZ100 receives the clock signal from the multiplexer,
an error message "CLK1 fail" of CH1 or "CLK2 fail" of CH2 is output when the signal is
interrupted.
Note: Messages "Com2 fail", "RX2 level err", "TX2 level err" and "CLK2 fail" are valid
in three-terminal applications.
If the failure lasts for ten seconds, a communication failure alarm is issued.
The output blocking ceases instantly when the failure recovers.
If the failure is a severe CF (Communication Failure) such that the remote terminal signal cannot
be received at all, the command protection can be blocked by setting the scheme switch
[SCFCNT] to “BLK”.
Communication channel delay time monitoring
The channel delay time is measured at the receiving end. If the time exceeds the timer TDSV
setting, an alarm is issued.
3.3.5 Signal Channel Monitoring and Testing for External Communication
Signal channel monitoring
In the PUP, POP or UOP schemes, when a trip permission signal is received consecutively for 10
seconds, this is considered to be an error of the signal channel and an alarm is issued. When the
signal modulation is a frequency shift method, if neither the trip permission signal nor the guard
signal can be received, an alarm of "Ch-R1. fail" and/or "Ch-R2. fail" is issued.
Signal channel testing
In the BOP scheme, the signal circuit including the remote end is automatically tested at a
prescribed time interval. Testing commences when a signal is transmitted from the local to remote
end. When the remote end receives the signal, it returns the signal on condition that there is no
fault on the power system. The terminal which is carrying out the testing checks that the
transmission path is healthy by receiving the return signal from the remote end within a prescribed
time after the carrier signal is transmitted from the local end.
If the signal cannot be received after the prescribed time, an alarm signal of SIGNAL CHANNEL
FAILURE is generated and a message "Remote 1 fail" and/or "Remote 2 fail" is displayed on the
LCD when manual testing.
To start the channel testing, the switch [CHMON] is set to "ON" and set the channel test interval.
The channel test interval can be set from 1 to 12 hours. And then, the OR logic output of the signal
No.225:EXT_CAR-S and the signal No.252:SBT is assigned the binary output BO13 of IO2.
Note 1
:
The time count for test interval is initialized when manual test is started or DC supply is turned on
.
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