Toshiba GR 200 Series, Instruction Manual

Page: 173 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 152 -
Overcurrent protection (OC)
The phase overcurrent (OC) protection is the major protection function and has both time
characteristic and directional elements. Four stages (elements) are available in the OC
protection. The user can select various features using the scheme switches provided. The
elements are named OC1, OC2, OC3, and OC4; and they operate independently.
To simplify the description, only OC1 is discussed but is applicable to the other OCs;
hence, read the expression for OC1 as OC2, OC3, and OC4 at each stage unless a special
explanation or instruction has been provided.
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Note: The implementation of particular features is dependent upon the selection of
hardware and the configuration of functions. Several IED models do not support certain
features. To determine whether a particular feature has been implemented within an IED,
identify the IED ordering number; and check the order number for the “G&T position” whilst
referring to the comparison table below. For more information, see
Appendix: Ordering
.
Table 2.5-1 Comparative table in respective ordering numbers
Sec. Feature
Ordering No. at “G&T”
31 32
– DT characteristic
✓ ✓
– IDMT characteristic
✓ ✓
✓
: Applicable NA: Not applicable