Toshiba GR200 Series Instruction Manual page 182

energized current is smaller than the setting [OC1]. The reducing degree will be
determined with the reset curve characteristics defined in the standards.
Note: For the setting [OC1-Rtimer]=DEF (definite-time-reset), the integrated value shall
be zero when an energized current is smaller than the setting [OC1], when the
small energized current is continued for timer setting [TOC1R]. The integrated
value will not be zero when the energized current does not flow small for the
setting [TOC1R]. DEF is allowed to set in the IEEE, US, and ORG. DEF is set
unconditionally in the IEC and UK (see Table 2.5-5).
Table 2.5-4 Constants for inverse-time-reset characteristics
Curve Type
IEC 60255-151
A IEC Normal Inverse (IEC-NI)
B IEC Very Inverse (IEC-VI)
C IEC Extremely Inverse (IEC-EI)
- UK Long Time Inverse (UK-LTI)
D IEEE Moderately Inverse (IEEE-MI)
E IEEE Very Inverse (IEEE-VI)
F IEEE Extremely Inverse (IEEE-EI)
- US CO8 inverse (US-CO8)
- US CO2 short time inverse (US-CO2)
Figure 2.5-6 Inverse-time-reset characteristics curves
Figure 2.5-7 illustrates that an integrating value will be influenced dependent on the
DEP or DEF setting. An energized quantity (I), where I is greater than a threshold setting
[OC1], will make an integrating value, which can determine how the element operates. If the
Curve Description
- 161 -
6F2S1915 (0.46)
kr
Β
sec
N/A N/A
N/A N/A
N/A N/A
N/A N/A
4.85 2
21.6 2
29.1 2
5.95 2
2.261 2
GRZ200 (Soft 031 & 032)