Toshiba GR200 Series Instruction Manual page 290

Phase-to-phase under-voltage protection (UVS)
The under-voltage protection function for phase-to-phase (UVS) consists of two stages
(elements) independently: UVS1 and UVS2. The time characteristic of the UVS element is
configured either definite time (DT) or inverse definite minimum time (IDMT) using settings.
Each UVS element detects the under-voltage condition of phase-to-phase. The user can
set a threshold and the ratio of a drip-out voltage (DO) to a pick-up voltage (PU) in the UVS
element. To simplify the description, only the UVS1 element is described, but the expression
is applicable to the UVS2; hence, read the expression for the UVS1 element as the UVS2 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
Table 2.16-1 Comparative table in respective ordering numbers
✓: Applicable
Sec. Feature
– Main features
NA: Not applicable)
- 269 -
Ordering No. at "G&T"
31 32
✓ ✓
6F2S1915 (0.46)
Appendix: Ordering
.
GRZ200 (Soft 031 & 032)