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6 F 2 S 0 8 5 7
Setting
The following shows the setting elements for the overexcitation protection and their setting
ranges.
Element Range Step Default Remarks
V
100.0 − 120.0V
0.1V 100.0V Transformer rated voltage / VT ratio
A
1.03 − 1.30
(
∗
)
0.01 1.03 Alarm
L
1.05 − 1.30
0.01 1.05 Low level
H
1.10 − 1.40
0.01 1.40 High level
LT
1 − 600s
1s 600s Operation time at low level
(Inverse time curve)
HT
1 − 600s
1s 1s Operation time at high level
(Inverse time curve)
RT
60 − 3600s
1s 250s Reset time after removing
overexcitation condition
TVFH
1 − 600s
1s 10s Operating time at high level setting
(Definite time delay)
TVFA
1 − 600s
1s 10s Alarm time
(Definite time delay)
Scheme switch
[V/F1] to [V/F5]
[V/FA]
Off/On
Off/On
(**)
On
Enable or disable tripping
Enable or disable alarm
(∗): Multiplier of (rated voltage) / (rated frequency)
(**): Refer to Appendix H for default setting.
sec
V/Hz
0
L
H
HT
TVFH
LT
(log T)
A
TVFA
H: High level (definite time tripping)
L: Low level
(p
ick u
p
level
)
HT: Operating time at high level
LT: Operating time at low level
A
: Alarm level
TVFH: Operating time at high level setting
TVFA: Alarm time
Withstand curve for transformer overexcitation
Figure 2.7.2 Setting Points