prevent function when the protected object is switched off. If the parameter is set Blockof trip or Block all unwanted trip is prevented.IntBlkStValn: Voltage level under which the blocking is activated set in % of VBase.This setting must be lower than the setting Pickupn. As switch of shall be detected thesetting can be very low, that is, about 10%.tBlkUVn: Time delay to block the undervoltage step n when the voltage level is belowIntBlkStValn, given in s. It is important that this delay is shorter than the trip time delayof the undervoltage protection step.8.2 Two step overvoltage protection OV2PTOV (59) IP14545-1 v38.2.1 IdentificationM17002-1 v8Function description IEC 61850identificationIEC 60617 identification ANSI/IEEE C37.2device numberTwo step overvoltage protection OV2PTOV3U>SYMBOL-C-2U-SMALLER-THAN V2 EN-US598.2.2 Application M13799-3 v9Two step overvoltage protection OV2PTOV (59) is applicable in all situations, wherereliable detection of high voltage is necessary. OV2PTOV (59) is used for supervisionand detection of abnormal conditions, which, in combination with other protectionfunctions, increase the security of a complete protection system.High overvoltage conditions are caused by abnormal situations in the power system.OV2PTOV (59) is applied to power system elements, such as generators, transformers,motors and power lines in order to detect high voltage conditions. OV2PTOV (59) isused in combination with low current signals, to identify a transmission line, open inthe remote end. In addition to that, OV2PTOV (59) is also used to initiate voltagecorrection measures, like insertion of shunt reactors, to compensate for low load, andthereby decreasing the voltage. The function has a high measuring accuracy andhysteresis setting to allow applications to control reactive load.OV2PTOV (59) is used to disconnect apparatuses, like electric motors, which will bedamaged when subject to service under high voltage conditions. It deals with highvoltage conditions at power system frequency, which can be caused by:Section 8 1MRK 505 370-UUS AVoltage protection246 Busbar protection REB670 2.2 ANSIApplication manual
