Toshiba GR-200 Series Instruction Manual page 174

6F2T0200 (0.15)
Phase-to-phase under-voltage protection (UVS)
The under-voltage protection function for phase-to-phase (UVS) consists of four stages
(elements) independently: UVS1 to UVS4. 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 other elements; hence, read the expression for the UVS1 element as the
others unless a special explanation or instruction has been provided.
GRE200 (1,2)
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