Toshiba GR200 Series - 2.25 Phase-to-phase under-voltage protection (UVS)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 331 -
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: Several IED models do not have phase-phase under-voltage protection features. To
determine whether the features are implemented in the IED or not, locate the IED ordering
number; and check the order number at “G&T position” referring to the comparison table below.
For more information, see Appendix: Ordering .
Table 2.25-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
UVS
Phase-phase under-voltage protection
✓
✓
✓: Applicable NA: Not applicable