CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONSC70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 2-192Reset type: Instantaneous/Timed (per IEEE)Curve timing accuracy at 1.03 to 20 x pickup:±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operateVoltage restraint: Modifies pickup current for voltage in the range of 0.1 < V < 0.9 VT Nominal in a fixed linear rela-tionshipPHASE/NEUTRAL/GROUND IOCPickup level: 0.020 to 30.000 pu in steps of 0.001Dropout level: 97 to 98% of pickupLevel accuracy:0.1 to 2.0 × CT rating: ±0.5% of reading or ±0.4% of rated (whichever is greater)> 2.0 × CT rating: ±1.5% of readingOverreach: <2%Pickup delay: 0.00 to 600.00 s in steps of 0.01Reset delay: 0.00 to 600.00 s in steps of 0.01Operate time: <16 ms at 3 × pickup at 60 Hz (Phase/Ground IOC)<20 ms at 3 × pickup at 60 Hz (Neutral IOC)Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)NEGATIVE SEQUENCE TOCPickup level: 0.020 to 30.000 pu in steps of 0.001Dropout level: 97% to 98% of pickupLevel accuracy: ±0.5% of reading or ±0.4% of rated (whichever is greater)from 0.1 to 2.0 x CT rating±1.5% of reading > 2.0 x CT ratingCurve shapes: IEEE Moderately/Very/Extremely Inverse; IEC (and BS) A/B/C and Short Inverse; GE IAC Inverse,Short/Very/ Extremely Inverse; I 2 t; FlexCurves™ (programmable); Definite Time (0.01 s basecurve)Curve multiplier (Time dial): 0.00 to 600.00 in steps of 0.01Reset type: Instantaneous/Timed (per IEEE) and LinearCurve timing accuracyat 1.03 to 20 x pickup: ±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operateNEGATIVE SEQUENCE IOCPickup level: 0.020 to 30.000 pu in steps of 0.001Dropout level: 97 to 98% of pickupLevel accuracy: 0.1 to 2.0 × CT rating: ±0.5% of reading or ±0.4% of rated (whichever is greater); >2.0 × CT rating:±1.5% of readingOverreach: <2%Pickup delay: 0.00 to 600.00 s in steps of 0.01Reset delay: 0.00 to 600.00 s in steps of 0.01Operate time: <20 ms at 3 × pickup at 60 HzTimer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)PHASE DIRECTIONAL OVERCURRENTRelay connection: 90 ° (quadrature)Quadrature voltage: ABC phase seq.: phase A (V BC ), phase B (VCA ), phase C (VAB ); ACB phase seq.: phase A (VCB ), phaseB (VAC), phase C (V BA)Polarizing voltage threshold: 0.004 to 3.000 pu in steps of 0.001Current sensitivity threshold: 0.05 puCharacteristic angle: 0 to 359° in steps of 1Angle accuracy: ±2°Operation time (FlexLogic operands):Tripping (reverse load, forward fault): <12 ms, typicallyBlocking (forward load, reverse fault): <8 ms, typicallyNEUTRAL DIRECTIONAL OVERCURRENTDirectionality: Co-existing forward and reverse
