The highest phase (or phase-to-phase) voltage is always used for the inverse time delayintegration, see Figure 121. The details of the different inverse time characteristics areshown in section "Inverse time characteristics"en05000016_ansi.vsdVoltageInverse Time VoltageTimeVAVBVCANSI05000016 V1 ENFigure 121: Voltage used for the inverse time characteristic integrationA TRIP requires that the overvoltage condition continues for at least the user set timedelay. This time delay is set by the parameter t1 and t2 for definite time mode (DT) andby selected voltage level dependent time curves for the inverse time mode (TOV). Ifthe PICKUP condition, with respect to the measured voltage ceases during the delaytime, the corresponding PICKUP output is reset.9.2.7.3 BlockingIt is possible to block two step overvoltage protection (OV2PTOV ,59) partially orcompletely, by binary input signals where:BLOCK: blocks all outputsBLK1: blocks all pickup and trip outputs related to step 1BLK2: blocks all pickup and trip outputs related to step 2Section 9 1MRK 502 043-UUS BVoltage protection262Technical Manual
