Toshiba GR200 Series - Page 252

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
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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 2.15-5).
Table 2.15-4 Constants for inverse-time-reset characteristics
Curve Type
IEC 60255-151
Curve Description
kr
sec
Β
A
IEC Normal Inverse (IEC-NI)
N/A
N/A
B
IEC Very Inverse (IEC-VI)
N/A
N/A
C
IEC Extremely Inverse (IEC-EI)
N/A
N/A
-
UK Long Time Inverse (UK-LTI)
N/A
N/A
D
IEEE Moderately Inverse (IEEE-MI)
4.85
2
E
IEEE Very Inverse (IEEE-VI)
21.6
2
F
IEEE Extremely Inverse (IEEE-EI)
29.1
2
-
US CO8 inverse (US-CO8)
5.95
2
-
US CO2 short time inverse (US-CO2)
2.261
2
Figure 2.15-6 Inverse-time-reset characteristics curves
Figure 2.15-7 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