Toshiba GR-200-5 Instruction Manual

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6F2T0207 (0.01)GRE200 (5,6)- 166 -Overvoltage protection for phase-to-neutral (OV)The over voltage protection function for phase (OV) detects an over voltage condition thatphase-to-neutral voltage is larger than a setting and operates accordingly. The OV functionhas four stages (elements; OV1, OV2, OV3, and OV4), which operate independently. The OVelement has a time delay characteristic; and the user can select either (1) independent(definite) time characteristic delay or (2) dependent (inverse) time characteristic delay. The OVelement is configured both the setting of a pickup voltage (PU) and the setting of a drop-offvoltage (DO).To simplify the description, only OV1 is discussed, but the expression is applicable toother OVs; hence, read the expression for OV1 as the other stages unless a special explanationor instruction has been provided.