Toshiba GR-200 Series Instruction Manual page 117
Multi functional protection ied
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energized quantity (I) falls below the threshold setting [OCN1], the element operation will
return to its reset stage after the time t(I) calculated in Equation (2.5-5).
Energizing current
Pickup threshold in relay
Measuring quantity
Inverse-time-reset characteristic
Stage to element
return
Setting
[*-Rtimer]=DEP
Integrator
Trip signal
Definite-time-reset characteristic
Stage to element
return
Setting
[*-Rtimer]=DEF
Integrator
Trip signal
Integration will be kept in timer [TOCN1R].
Reset time of DT
(vi)
In the DT characteristic, the reset time is designed to be instant.
Summary of OCN operation
(vii)
Table 2.5-3 shows a summary for OCN operation. Note that DEF will be set unconditionally in
IEC-NI, VI, EI and UK-LTI characteristics (†).
Table 2.5-3 Type and standard board in the OCN1 (A tick represents a selectable function)
DT
Characteristics
DT
IEC-NI
IEC-VI
IEC-EI
UK LTI
IEEE-MI
IEEE-VI
IEEE-EI
US-CO2
US-CO8
Original
The integration will be deceased depending on the
[OCN1-RTMS-*] reset characteristics.
The integration will start again when the energizing current
becomes larger than [OCN1] within [TOCN1R].
Figure 2.5-5 Inverse-time-reset characteristics
IEC-NI
IEC-VI
IEC-EI
✓
✓
✓
✓
Reset time
The integration will be reset when the energizing current
does not become larger than [OCN1] in [TOCN1R].
IDMT
UK-LTI
IEEE-MI
IEEE-VI
✓
✓
✓
- 98 -
6F2T0200 (0.15)
Time →
Energizing current
cleared by tripping
[OCN1] threshold
0 A
IEEE-EI
US-CO2
US-CO8
✓
✓
✓
GRE200 (1,2)
Original
✓
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