Toshiba GR200 Series Instruction Manual page 214

6F2S1915 (0.46)
Negative sequence overcurrent protection (OCN)
Negative-sequence overcurrent protection (OCN) function has both time characteristic and
directional elements. Four stages (elements) are available in the OCN function. The user can
select various features using the scheme switches provided. The elements are named OCN1,
OCN2, and others; and they operate independently.
To simplify the description, only OCN1 is discussed but is applicable to the other OCNs;
hence, read the expression for OCN1 as OCN2, OCN3, and OCN4 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
Appendix: Ordering
referring to the comparison table below. For more information, see .
Table 2.7-1 Comparative table in respective ordering numbers
Ordering No. at "G&T"
Sec. Feature
31 32
– Main features
✓ ✓
✓: Applicable NA: Not applicable
GRZ200 (Soft 031 & 032)
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