Toshiba GR200 Series Instruction Manual page 269

conformity to IEC 60255-127:
where,
t = operating time (seconds),
V = energizing voltage (voltage),
Vs = pickup voltage setting (voltage), and
TMS = time multiplier setting to adjust a curve
If the user will require a user-programmable (original) curve in the inverse time
characteristic, it is provided when the constants of k, a, c are set, as shown in Table 2.13-2. For
example, the user-programmable (original) curve in the OVS1 element will be acquired when
Original is set for the scheme switch [OVS1-Timer], and when values of respective constants
are set for [OVS1-k], [OVS1-a], and [OVS1-C].
Figure 2.13-2 IDMT characteristic of OVS element
Table 2.13-2 Constant value at each setting of IDMT curve
Set item
IDMT
User-programmable
(Original)
t ( G ) = TMS × {[
( �� ��
Overvoltage Inverse Time Curves
1000.000
100.000
10.000
1.000
0.100
1 1.5
Applied Voltage (x Vs)
k
1
0.00000 – 500.00000
by 0.00001 step
- 248 -
��
] + ��}
��
⁄ ) − 1
��
TMS = 10
TMS = 5
TMS = 2
TMS = 1
2 2.5 3
a
1
0.00000 – 10.00000
by 0.00001 step
6F2S1915 (0.46)
(2.13-1)
C
0
0.00000 – 10.00000
by 0.00001 step
GRZ200 (Soft 031 & 032)