Toshiba GR-200-5 Instruction Manual

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6F2T0207 (0.01)GRE200 (5,6)- 142 -Under-voltage protection for phase-to-natural (UV)The under-voltage protection function for phase-to-earth (UV) consists of four stages(elements) independently: UV1 to UV4. The time characteristic of the UV element is configuredeither definite time (DT) or inverse definite minimum time (IDMT) using settings.Each UV stage (element) detects the under-voltage condition of phase-to-earth. The usercan set a threshold and the ratio of a drip-out voltage (DO) to a pick-up voltage (PU) in the UVelement. To simplify the description, only the UV1 element is described, but the expression isapplicable to the other elements; hence, read the expression for the UV1 element as the othersunless a special explanation or instruction has been provided.