Toshiba GRT100 Series Instruction Manual page 36

Setting
The following shows the setting elements for the overexcitation protection and their setting
ranges.
Element Range
100.0  120.0V
V
1.03  1.30
A
1.05  1.30
L
1.10  1.40
H
1  600s
LT
1  600s
HT
60  3600s
RT
1  600s
TVFH
1  600s
TVFA
Scheme switch
[V/F1] to [V/F5] Off/On
[V/FA] Off/On
(): Multiplier of (rated voltage) / (rated frequency)
(**): Refer to Appendix H for default setting.
V/Hz
H
L
A
0 TVFA
Step Default
0.1V 100.0V
(  )
0.01 1.03
0.01 1.05
0.01 1.40
1s 600s
1s 1s
1s 250s
1s 10s
1s 10s
(**)
On
A: Alarm level
H: High level (definite time tripping)
L: Low level (pick up level)
HT: Operating time at high level
LT: Operating time at low level
TVFH: Operating time at high level setting
TVFA: Alarm time
Withstand curve at transformer overexcitation
HT
LT
TVFH
Figure 2.8.2 Setting Points
 35 
Remarks
Transformer rated voltage / VT ratio
Alarm
Low level
High level
Operation time at low level (Inverse
time curve)
Operation time at high level (Inverse
time curve)
Reset time after removing
overexcitation condition
Operating time at high level setting
(Definite time delay)
Alarm time (Definite time delay)
Enable or disable tripping
Enable or disable alarm
sec
(log T)
6 F 2 S 0 7 8 9