Toshiba GR 200 Series, Instruction Manual

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6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 299 -
Fail safe (FS)
Various protection functions are connected to a trip function, which opens circuit breakers. The
operation of the trip function should be reliable correctly in enough, if the function of fail-safe
(FS) is provided. That FS function includes overcurrent element (OCFS), phase current change
detector element (OCDFS), earth fault element (EFFS), multi-level overcurrent element
(OCMFS), under-voltage element for phase-to-ground (UVFS), under-voltage element for
phase-to-phase fault (UVSFS), and under-voltage change detection element (DUVFS). Each
element has a scheme switch that disables its element independently. The FS uses the OCFS.
However, it is possible to use the OCMF, if the FS function is for the function of out of step
tripping (OST) that is discussed separately (See Chapter Relay application:
Out of step
tripping
).
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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 2.20-1 Comparative table in respective ordering numbers
Sec. Feature
Ordering No. at “G&T”
31 32
– Main features
✓ ✓
✓
: Applicable NA: Not applicable