ABB REF 610 Technical Reference Manual

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Contents

ABB REF 610 Technical Reference Manual Manual pdf 139 page image

1MRS 755535 Feeder Protection RelayTechnical Reference Manual - ANSI VersionREF 6101395. Application examples5.1. Auto-reclose function5.1.1. Fast tripping and initiation of shot 1 using two protectionelementsIn several applications, such as fuse-saving applications involving down-streamfuses, tripping and initiation of shot 1 should be fast (instantaneous or short-timedelayed) and of shot 2 and 3, and definite tripping time delayed.In this example, two overcurrent elements are used, 51P and 50P-1. Element 50P-1is given an instantaneous characteristic and element 51P a time delay. By settingSG2/2 to 1 and SG2/7 to 1, element 50P-1 will be blocked by the AR function duringshot 2 and 3.Fig. 5.1.1.-1 Fast initiation of shot 1 using one fast and one delayed elementIn case of a short-circuit in the network, element 50P-1 will trip the circuit breakerand initiate shot 1. At the time of shot initiation, the blocking of element 50P-1 willbe activated. If the network fault is not cleared, element 51P will trip the circuitbreaker and continue the auto-reclose sequence to shot 2, shot 3 and finally definitetripping.51P50P-1Block 50P-1 atShot 1,2 and 3SG2/2=1SG2/7=1Open CBClose CBClose CBBlock 50P-1TripTrip79CB ClosedCB Open50P-1 TDLY50P-1 TripShot 1Block 50P-151P TDLY51P TripShot 251P TDLYBlock 50P-151P TripShot 351P TDLYBlock 50P-151P TripDefinite Trip