Toshiba GR200 Series - (vi) Reset time of DT; (vii) Summary of OCN operation; 2.17.3 Threshold value; 2.17.4 Reset Ratio

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 269 -
(vi) Reset time of DT
In the DT characteristic, the reset time is designed to be instant.
(vii) Summary of OCN operation
Table 2.17-4 shows a summary for OCN operation. Note that DEF will be set unconditionally
in IEC-NI, VI, EI and UK-LTI characteristics (†).
Table 2.17-4 Type and standard board in the OCN1 (A tick represents a selectable function)
Characteristics
DT
IDMT
IEC-NI
IEC-VI
IEC-EI
UK-LTI
IEEE-MI
IEEE-VI
IEEE-EI
US-CO2
US-CO8
Original
Scheme switch [OCN1-Timer]
DT
✓
IEC-NI
✓
IEC-VI
✓
IEC-EI
✓
UK LTI
✓
IEEE-MI
✓
IEEE-VI
✓
IEEE-EI
✓
US-CO2
✓
US-CO8
✓
Original
✓
Scheme switch
[OCN1-Rtimer]
DEF
N.A
✓†
✓†
✓†
✓†
✓
✓
✓
✓
✓
✓
DEP
N.A
✓
N.A
✓
N.A
✓
N.A
✓
N.A
✓
N.A
✓
2.17.3 Threshold value
The value of threshold current at which the OCN (I
2
) element will pick-up is configured by
settings; the setting [OCN1] is provided for both the IDMT and the DT characteristic. Note
that the settings of the threshold levels are allowed to have distinct values in the respective
OCN 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 Technical description:
Transformer module for AC analogue input ).
2.17.4 Reset Ratio
The ratio of the threshold current for pick-up to reset is applied using a setting; for example,
the ratio for the OCN1 element is set using the setting [OCN1-DPR]. The reset ratios for the
other OCN elements are also provided.
2.17.5 Miscellaneous functions