Toshiba GR200 Series Instruction Manual page 348

Setting pick-up operation
The IDMT characteristic is applied when the operation of the UV1 element is required
inversely in accordance with the level of input voltage. The IDMT characteristic curve is
illustrated in Figure 2.24-2 using a value of time multiplier is set for [UV1-TMS]. It is followed
to Equation (2.24-1) in conformed in IEC 60255-127
where,
t = operating time (seconds),
V = energizing voltage (voltage),
Vs = pickup voltage setting (voltage),
TMS = time multiplier setting.
1000.000
100.000
10.000
1.000
Figure 2.24-2 IDMT characteristics curves depending on TMS
Setting drop-off operation
The user should set the time for resetting in the IDMT characteristic. Figure 2.24-3 shows
examples of the pick-up and the drop-off relevant to both the fault occurrences and the
�� ( �� ) = ������ × [
( �� ��
Undervoltage Inverse Time Curves
TMS=10
TMS=5
TMS=2
TMS=1
0 0.2 0.4
Applied Voltage (x Vs)
- 325 -
��
]
⁄ ) − ��
��
0.6 0.8 1
6F2S1914 (0.49)
(2.24-1)
GRL200 (Soft 033 & 037)