Toshiba GR200 Series Instruction Manual page 150

Figure 2.6-2 IDMT characteristic curves
Operate time of DT
(v)
The operate time in the DT is a constant.
Time characteristic
The user should set DT for the scheme switches [OC1-Timer]. The value of the required operate
time is set for the setting [TOC1] in the range 0.00–300.00s.
Instantaneous activation
The operate time of instantaneous characteristic is achieved by setting zero for the [TOC1].
Reset time of IDMT
(vi)
Programming the reset time characteristic is available in the IEEE, US standards. It is also
allowed in original (user-programmable) inverse-time-reset characteristic. To get this
characteristic, the user should set DEP for setting [OC1-Rtimer]†. The following equation
defines the reset time for the inverse-time-reset characteristic. (ref. IEC 60255-151):
kr
t ( I ) = RTMS × [
1 − ( �� ��
⁄ )
- 136 -
]
β
��
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
(2.6-2)