179
6
F
2
S
0
8
5
0
simultaneously in the open or closed state for the prescribed period.
The monitoring is blocked by setting the scheme switch [LSSV] to OFF. The default setting of
[LSSV] is OFF to prevent a false failure detection when the disconnector contacts are not
introduced.
3.3.11
Failure Alarms
When a failure is detected by the automatic supervision, LCD display, LEDs indication, external
alarm and event recording are performed.
Table 3.3.11.1 summarizes the supervision items and alarms. The LCD messages are shown on
the "Auto-supervision" screen which is displayed automatically when a failure is detected or
displayed by pressing the VIEW key. The event record messages are shown on the "Event
record" screen by opening the "Record" sub-menu. The alarms are retained until the failure is
recovered.
The alarms can be disabled collectively by setting the scheme switch [AMF] to OFF. This setting
is used to block unnecessary alarms during commissioning tests or maintenance.
When the Watch Dog Timer detects that the software is not running normally, LCD display and
event recording of the failure may not function normally.
A DC supply failure disables the LCD display and event recording of the failure as well.
For details of discrimination of the two failures mentioned above, see Section 6.7.2.
Table 3.3.11.1 Supervision Items and Alarms
Supervision Item
LCD
message
LED
"IN SERVICE"
LED
"ALARM"
External
alarm
Event record
message (default)
AC input imbalance monitoring
Vo, V2, Io
(1) on/off
(2)
on
(4)
V0 err / V2 err /
I0 err
CT circuit monitoring
(1)
on/off (7)
on
(4)
CT err
A/D accuracy checking
Memory monitoring
(1) off
on
(4) Relay
fail
Watch Dog Timer
off
on
(4)
DC supply monitoring
off
(3)
(4)
DC
supply
Communication monitoring for
differential protection
Com. fail
Com. fail-R (*)
on
on
on
off
(5)
(5)
Com. fail
Com. fail-R (*)
Communication monitoring for
differential protection
Ch-R . fail (*)
on
on
(5) Ch-R . fail (*)
Sampling Synchronization
monitoring
Sync. fail (*)
on
on
(4) Sync. fail (*)
Send signal level monitoring
TX level err (*)
on
off
(5)
TX level err (*)
Receive signal level monitoring
RX level err (*)
on
off
(5)
RX level err (*)
Clock monitoring
CLK. fail (*)
on
off
(5)
CLK. fail (*)
Ready signal monitoring
Term. rdy off (*)
on
on
(5)
Term. rdy off (*)
GPS signal reception monitoring
GPS 1PPS off
on
on
(5)
GPS 1PPS off
Disconnector monitoring
DS fail
on
on
(4)
DS fail
Id monitoring
Id err
on/off (6)
on
(4)
Relay fail
Relay address monitoring
RYID err
on
on
(5)
RYID err
CTF monitoring
CT fail
On
On (8)
(5)
CTF
VTF monitoring
VT fail
On
On (8)
(5)
VTF
(*) takes 1 or 2 according to the channel linking, either with remote terminal 1 or 2.
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