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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
-
-
Figure 2.1-5 IDMT characteristic curves
Operate time of DT
(v)
The operate time in the DT is a constant.
Table 2.1-2 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
- 23 -
6F2T0207 (0.01)
k
α
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
GRE200 (5,6)
c
sec
0
0
0
0
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