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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.
Supervision Item
AC input imbalance monitoring
Vo, V2, Io
CT circuit monitoring
A/D accuracy checking
Memory monitoring
Watch Dog Timer
DC supply monitoring
Communication monitoring for
differential protection
Communication monitoring for
differential protection
Sampling Synchronization
monitoring
Send signal level monitoring
Receive signal level monitoring
Clock monitoring
Ready signal monitoring
GPS signal reception monitoring
Disconnector monitoring
Id monitoring
Relay address monitoring
CTF monitoring
VTF monitoring
(*)
takes 1 or 2 according to the channel linking, either with remote terminal 1 or 2.
Table 3.3.11.1 Supervision Items and Alarms
LCD
LED
message
"IN SERVICE"
(1)
on/off (2)
(1)
on/off (7)
(1)
off
off
off
Com. fail
on
Com. fail-R (*)
on
Ch-R . fail (*)
on
Sync. fail (*)
on
TX
level err (*)
on
RX
level err (*)
on
CLK. fail (*)
on
Term. rdy off (*)
on
GPS 1PPS off
on
DS fail
on
Id err
on/off (6)
RYID err
on
CT fail
On
VT fail
On
179
LED
External
Event record
"ALARM"
alarm
message (default)
on
(4)
on
(4)
on
(4)
on
(4)
(3)
(4)
on
(5)
off
(5)
Com. fail-R (*)
on
(5)
on
(4)
off
(5)
TX
off
(5)
RX
off
(5)
on
(5)
Term. rdy off (*)
on
(5)
on
(4)
on
(4)
on
(5)
On (8)
(5)
On (8)
(5)
6 F 2 S 0 8 5 0
V0 err / V2 err /
I0 err
CT err
Relay fail
DC supply
Com. fail
Ch-R . fail (*)
Sync. fail (*)
level err (*)
level err (*)
CLK. fail (*)
GPS 1PPS off
DS fail
Relay fail
RYID err
CTF
VTF
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