Toshiba GR200 Series Instruction Manual page 149

TMS = time multiplier setting number,
k, α, c = constants defining curve.
The nine pre-programmed standard characteristic curves are defined in Table 2.6-2. In
addition, one original (user-programmable) curve can be applied. One curve can be chosen for
each OC stage. Figure 2.6-2 illustrates these characteristic curves. For example, the user
should set one for the scheme switch [OC1-Timer]. ("IEC-NI" is for IEC Normal Inverse
characteristic; "IEC-VI" for IEC Very inverse; "IEC-EI" for IEC Extremely Inverse; "UK-LTI" for
UK Long Time Inverse; "IEEE-MI" for IEEE Moderately Inverse; "IEEE-VI" for IEEE Very
Inverse; "IEEE-EI" for IEEE Extremely Inverse; "US-CO8" for US CO8 Inverse; "US-CO2" for
US CO2 Short Time Inverse, and "Original" for user-programmable characteristic.)
In the IDMT, the user can also program the characteristic using time-multiplier-setting
(TMS) for the required operate time. For example, when the IEC characteristic is selected, the
user can set the TMS value using the setting [OC1-TMS-IEC] (incidentally, the default value
for the TMS is 1.00). The other TMSs are also available by the [OC1-TMS-UK], [OC1-TMS-
IEEE], [OC1-TMS-US] and [OC1-TMS-ORG].
Curve type
(IEC 60255-151)
A
B
C
-
D
E
F
-
-
Table 2.6-2 Constants for IDMT
Curve Description
IEC Normal Inverse (IEC-NI)
IEC Very Inverse (IEC-VI)
IEC Extremely Inverse (IEC-EI)
UK Long Time Inverse (UK-LTI)
IEEE Moderately Inverse (IEEE-MI)
IEEE Very Inverse (IEEE-VI)
IEEE Extremely Inverse (IEEE-EI)
US CO8 inverse (US-CO8)
US CO2 short time inverse (US-CO2) 0.02394
- 135 -
6F2S1931 (0.20)
k
α
sec sec
0.14 0.02
13.5 1
80 2
120 1
0.0515 0.02 0.114
19.61 2 0.491
28.2 2 0.1217
5.95 2 0.18
0.02 0.01694
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
c
0
0
0
0