Toshiba GR200 Series Instruction Manual page 184

Summary of OC operation
(viii)
Table 2.5-5 shows the summary of OC operation. Note that DEF will be set unconditionally in
IEC-NI, VI, EI and UK-LTI characteristics (†).
Table 2.5-5 Type and standard board in the OC1 (A tick shows a selectable function)
Characteristics
DT
IEC-NI
IEC-VI
IEC-EI
UK LTI
IEEE-MI
IEEE-VI
IEEE-EI
US-CO2
US-CO8
Original
DEF
DEP
Threshold value for operation
2.5.3
The value of threshold current at which the OC element will pick-up is configured by a setting;
the setting [OC1] is provided for both the IDMT and DT characteristics. Note that the settings
of the threshold levels have distinct values in the respective OC elements. A rating current for
the input is defined either 1A or 5A; the input rating is defined on a VCT. (For more information
about the VCT, see Chapter
(2.34.3a)
Reset Ratio
2.5.4
The ratio of the threshold current for pick-up to reset is applied using a setting; for example,
the ratio for the OC1 element is set using the setting [OC1-DPR]. The reset ratios for the other
OC elements are also provided.
Miscellaneous functions
2.5.5
Trip mode
(i)
Every OC element has a selectable tripping mode; the mode is selected using a scheme switch.
For the OC1 element, for example, a scheme switch [OC1-OPMD] is provided. When a trip is
required for any faults that are detected, 3POR (a fault occurs in one or more phases) is set for
DT
IEC-NI IEC-VI IEC-EI

✓
✓
✓
✓ † ✓ † ✓ †
N.A
N.A
N.A
N.A
N.A
N.A
N.A
Technical description: Transformer module for AC analogue input
IDMT
UK-LTI IEEE-MI IEEE-VI
✓
✓
✓
✓ †
✓ ✓
✓
✓
- 163 -
6F2S1915 (0.46)
IEEE-EI US-CO2 US-CO8
✓
✓
✓
✓ ✓ ✓
✓
✓
✓
GRZ200 (Soft 031 & 032)
Original
✓
✓
✓
).