Pickup1PICKUPTRIPtReset1t1ANSI10000038-2-en.vsdANSI10000038 V2 EN-USFigure 102: Example for Definite Time Delay stage 1 operation9.2.7.3 Blocking M15330-20 v8It is possible to block Two step overvoltage protection OV2PTOV, (59) partially orcompletely, by binary input signals where:BLOCK: blocks all outputsBLKTR1: blocks all trip outputs of step 1BLK1: blocks all pickup and trip outputs related to step 1BLKTR2: blocks all trip outputs of step 2BLK2: blocks all pickup and trip outputs related to step 29.2.7.4 Design M15330-34 v8The voltage measuring elements continuously measure the three phase-to-groundvoltages or the three phase-to-phase voltages. Recursive Fourier filters or true RMSfilters of input voltage signals are used. The phase voltages are individually comparedto the set value, and the highest voltage is used for the inverse time characteristicintegration. A special logic is included to achieve the 1 out of 3, 2 out of 3 or 3 out of 3criteria to fulfill the PICKUP condition. The design of Two step overvoltage protection(OV2PTOV, 59) is schematically described in figure 103.1MRK 511 408-UUS A Section 9Voltage protectionPhasor measurement unit RES670 2.2 ANSI 297Technical manual
