Toshiba GR200 Series Instruction Manual page 243

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 number of relay elements depends on the IED model. To know the number in
respective IED models, locate the IED ordering number; and check the order number at "G&T
position" referring to the comparison table below. For more information, see
Ordering
.
Table 2.15-1 Comparative table in respective ordering numbers
Non-directional/directional definite time OC protection
✓: Applicable NA: Not applicable
- 220 -
6F2S1914 (0.49)
Ordering No. at "G&T"
No. of stages
33
4
✓
GRL200 (Soft 033 & 037)
Appendix:
37
✓