GE B90 Instruction Manual

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Contents

2-10 B90 Low Impedance Bus Differential System GE Multilin2.2 SPECIFICATIONS 2 PRODUCT DESCRIPTION22.2SPECIFICATIONSSPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE2.2.1 PROTECTION ELEMENTSThe operating times below include the activation time of a trip rated form-A output contact unless otherwise indi-cated. FlexLogic™ operands of a given element are 4 ms faster. This should be taken into account when usingFlexLogic™ to interconnect with other protection or control elements of the relay, building FlexLogic™ equations, orinterfacing with other IEDs or power system devices via communications or different output contacts.BUS DIFFERENTIAL (87B)Pickup level: 0.050 to 2.000 pu in steps of 0.001Low slope: 15 to 100% in steps of 1High slope: 50 to 100% in steps of 1Low breakpoint: 1.00 to 30.00 pu in steps of 0.01High breakpoint: 1.00 to 30.00 pu in steps of 0.01High set level: 0.10 to 99.99 pu in steps of 0.01Dropout level: 97 to 98% of pickupLevel accuracy:0.1 to 2.0 × CT rating: ±0.5% of reading or ±1% of rated (which-ever is greater)>2.0 × CT rating ±1.5% of readingOperating time: one power system cycle (typical)Number of zones: 1 or 4 (option)Max number of inputs: 8, 16, or 24 (option)CT TROUBLEResponding to: Differential currentPickup level: 0.020 to 2.000 pu in steps of 0.001Pickup delay: 1.0 to 60.0 sec. in steps of 0.1Time accuracy: ±3% or ±40 ms, whichever is greaterAvailability: one per zone of protectionISOLATOR MONITORINGResponding to: Both normally-open and normally-closedauxiliary contactsAsserting: Isolator Position, Isolator Alarm, BlockSwitchingAlarm pickup delay: 0.00 to 10.00 s in steps of 0.05Time accuracy: ±3% or ±40 ms, whichever is greaterTIME OVERCURRENTPickup level: 0.000 to 30.000 pu in steps of 0.001Dropout level: 97 to 98% of pickupLevel accuracy:0.1 to 2.0 × CT 0.5% of reading or 1% of nominal(whichever is greater)above 2.0 × CT 1.5% of readingCurve shapes: IEEE Moderately/Very/ExtremelyInverse; IEC (and BS) A/B/C and ShortInverse; GE IAC Inverse, Short/Very/Extremely Inverse; I 2 t; FlexCurves™(programmable); Definite Time (0.01 sbase curve)TD multiplier: 0.00 to 600.00 in steps of 0.01Reset type: Instantaneous or Timed (per IEEE)Time accuracy: ±3% or ±40 ms, whichever is greaterINSTANTANEOUS OVERCURRENTPickup level: 0.000 to 30.000 pu in steps of 0.001Dropout level: 97 to 98% of pickupLevel accuracy:0.1 to 2.0 × CT 0.5% of reading or 1% of nominal(whichever is greater)above 2.0 × CT 1.5% of readingPickup delay: 0 to 65.535 s in steps of 0.001Reset delay: 0 to 65.535 s in steps of 0.001Time accuracy: ±3% or ±4 ms, whichever is greaterOperate time: <16 ms at 60 HzUNDERVOLTAGEPickup level: 0.000 to 3.000 pu in steps of 0.001Dropout level: 102 to 103% of pickupLevel accuracy: ±0.5% of reading from 10 to 208 VPickup delay: 0 to 65.535 s in steps of 0.001Reset delay: 0 to 65.535 s in steps of 0.001Time accuracy: ±3% or ±4 ms, whichever is greaterOperate time: <16 ms at 60 HzEND FAULT PROTECTIONIOC pickup level: 0.000 to 30.000 pu in steps of 0.001IOC dropout level: 97 to 98% of pickupLevel accuracyat 0.1 to 2.0 × CT: 0.5% of reading or 1% of nominal(whichever is greater)above 2.0 × CT: 1.5% of readingCB open pickup timer: 0 to 65.535 s in steps of 0.001End Fault pickup timer: 0 to 65.535 s in steps of 0.001Time accuracy: ±3% or ±8 ms, whichever is greaterBREAKER FAILUREMode: 3-poleCurrent supervision: phase currentCurrent supv. pickup: 0.001 to 30.000 pu in steps of 0.001Current supv. dropout: 97 to 98% of pickupCurrent supv. accuracy:0.1 to 2.0 × CT rating: ±0.75% of reading or ±2% of rated(whichever is greater)above 2 × CT rating: ±2.5% of readingTime accuracy: ±3% or 4 ms, whichever is greaterTRIP BUS (TRIP WITHOUT FLEXLOGIC™)Number of elements: 6Number of inputs: 16Operate time: <2 ms at 60 HzTime accuracy: ±3% or 10 ms, whichever is greaterNOTE