ACrvn, BCrvn, CCrvn, DCrvn, PCrvn: Parameters to set to create programmable undervoltage inverse time characteristic. Description of this can be found in the technicalreference manual.CrvSatn: When the denominator in the expression of the programmable curve is equal tozero the time delay will be infinity. There will be an undesired discontinuity. Therefore,a tuning parameter CrvSatn is set to compensate for this phenomenon. In the voltageinterval Pickup> down to Pickup> · (1.0 - CrvSatn/100) the used voltage will be: Pickup>· (1.0 - CrvSatn/100). If the programmable curve is used this parameter must be calculatedso that:0100CrvSatnB C× - >EQUATION1448 V1 EN (Equation 74)IntBlkSeln: This parameter can be set to Disabled, Block of trip, Block all. In case of a lowvoltage the undervoltage function can be blocked. This function can be used to preventfunction when the protected object is switched off. If the parameter is set Block of trip orBlock all unwanted trip is prevented.IntBlkStValn: Voltage level under which the blocking is activated set in % of VBase. Thissetting must be lower than the setting Pickupn. As switch of shall be detected the settingcan 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 operate time delayof the undervoltage protection step.8.2 Two step overvoltage protection OV2PTOV (59)8.2.1 IdentificationFunction description IEC 61850identificationIEC 60617 identification ANSI/IEEE C37.2device numberTwo step overvoltage protection OV2PTOV3U>SYMBOL-C-2U-SMALLER-THAN V2 EN59Section 8 1MRK 505 337-UUS -Voltage protection234Application manual
