ABB REF 610 Technical Reference Manual

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ABB REF 610 Technical Reference Manual Manual pdf 154 page image

than the reclaim time (e.g. half of the reclaim time), the blocking of stage I>> (inthis case) will be reset before the AR function. Stage I>> will now be able tocontinue the AR sequence and the pumping effect will thus be avoided.6.1.2. Fast tripping and initiation of shot 1 using start signalsAn alternative way to achieve fast tripping and shot initiation (typical for certaincountries, such as Finland), is to use start signals from protection stages for shotinitiation. The AR function of REF 610 can be initiated by the start signals fromstages I> and I 0>.The start time of stages I> and I0> is very short but can be extended with the settingsAR I> start Delay and AR I 0 > start Delay of the AR function. When theset start delay elapses, the shot will be initiated and the AR function will trip thecircuit breaker by issuing the Open CB Command.I>0→1t> t>tTripStartClose CBCB closedCB open Shot 1 Shot 2 Shot 3 Definite TripI> Start I> Trip I> TripOpen CBI> start delayOpen CBOpen CB CommandClose CB CommandClose CBCommandOpen CBCommandClose CBCommandClose CBCommandI> start delay I> start delayOpen CBCommandI> StartShots 1, 2 and 3initiationShot 1 initiationA040361Fig. 6.1.2.-1 Fast initiation of shot 1 using start signalsShot initiation by a start signal applies only to shot 1, and to definite tripping, i.e.when no more shots are allowed but the network fault has not been cleared. In thiscase, the AR function will trip the circuit breaker on expiration of AR I> startDelay and AR I 0 > start Delay.The signal Open CB Command must be routed to the output contactused for tripping the circuit breaker.154REF 610REF 610 Feeder Protection RelayTechnical Reference Manual1MRS755310