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3.3.6
Trip Blocking
When a failure is detected by the following supervision items, the trip function is blocked as long
as the failure exists, and is restored when the failure is removed.
• A/D accuracy check
• Memory monitoring
• Watchdog Timer
When a fault is detected by the AC input imbalance monitoring, the scheme switches [CTSVEN],
[V0SVEN] and [V2SVEN] setting can be used to determine if both tripping is blocked and an
alarm is output, or if only an alarm is output.
3.3.7
Setting
The setting element necessary for the automatic supervision and its setting range are shown in the
table below.
Element
CTF supervision
EFF
ZOVF
VTF supervision
UVF
OCDF
[CTFEN]
[VTF1EN]
[VTF2EN]
[CTSVEN]
[V0SVEN]
[V2SVEN]
[TCSVEN1]
[TCSVEN2]
[TCSVEN3]
[TCSVEN4]
[TCSVEN5]
[TCSVEN6]
[TCSVEN7]
[TCSVEN8]
[CBSVEN]
(*) Current values shown in the parentheses are in the case of 1 A rating. Other current values are in
the case of 5 A rating.
When setting the ZOVF and EFF, the maximum detection sensitivity of each element should be
set with a margin of 15 to 20% taking account of variations in the system voltage, the asymmetry
of the primary system and CT and VT error.
Range
Step
0.05 - 25.00 A
0.01 A
( 0.01 - 5.00 A
0.01 A
5.0 – 130.0 V
0.1 V
5.0 – 130.0 V
0.1 V
0.5 A (Fixed)
( 0.1 A (Fixed) )
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/ALM&BLK/ALM
Off/ALM&BLK/ALM
Off/ALM&BLK/ALM
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On/OPT-On
Off/On
⎯
135
Default
Remarks
1.00 A
Residual overcurrent threshold setting
0.20 A) (*)
20.0 V
Residual overvoltage threshold setting
51.0 V
Undervoltage threshold setting
Phase current change detection
Off
CTF supervision
Off
VTF1 supervision
Off
VTF2 supervision
ALM
AC input imbalance monitoring (current)
ALM
AC input imbalance monitoring (Vo)
ALM
AC input imbalance monitoring (V2)
Off
Trip circuit supervision for IO1-TRP1
Off
Trip circuit supervision for IO1-TRP2
Off
Trip circuit supervision for IO2-TRP1
Off
Trip circuit supervision for IO2-TRP2
Off
Trip circuit supervision for IO3-TRP1
Off
Trip circuit supervision for IO3-TRP2
Off
Trip circuit supervision for IO4-TRP1
Off
Trip circuit supervision for IO4-TRP2
Off
CB condition supervision
⎯
6 F 2 S 0 8 4 2
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