Set value:Mode Formula used for complex power calculationCA * *( )CA C AS V I I= × -EQUATION2060-ANSI V1 EN (Equation 69)A *3 A AS V I= × ×EQUATION2061-ANSI V1 EN (Equation 70)B *3 B BS V I= × ×EQUATION2062-ANSI V1 EN (Equation 71)C *3 C CS V I= × ×EQUATION2063-ANSI V1 EN (Equation 72)The active and reactive power is available from the function and can be used formonitoring and fault recording.The component of the complex power S = P + jQ in the direction Angle1(2) is calculated.If this angle is 0° the active power component P is calculated. If this angle is 90° thereactive power component Q is calculated.The calculated power component is compared to the power pick up setting Power1(2). Fordirectional underpower protection, a pickup signal PICKUP1(2) is activated if thecalculated power component is smaller than the pick up value. For directional overpowerprotection, a pickup signal PICKUP1(2) is activated if the calculated power component islarger than the pick up value. After a set time delay TripDelay1(2) a trip TRIP1(2) signalis activated if the pickup signal is still active. At activation of any of the two stages acommon signal PICKUP will be activated. At trip from any of the two stages also acommon signal TRIP will be activated.To avoid instability there is a hysteresis in the power function. The absolute hysteresis forstage 1(2) is 0.5 p.u. for Power1(2) ≥ 1.0 p.u., else the hysteresis is 0.5 Power1(2).If the measured power drops under the (Power1(2) - hysteresis) value, the over-powerfunction will reset after 0.06 seconds. If the measured power comes over the (Power1(2)+ hysteresis) value, the under-power function will reset after 0.06 seconds. The resetmeans that the pickup signal will drop out and that the timer of the stage will reset.8.7.4.1 Low pass filteringIn order to minimize the influence of the noise signal on the measurement it is possible tointroduce the recursive, low pass filtering of the measured values for S (P, Q). This willSection 8 1MRK 502 048-UUS ACurrent protection260Technical manual
