Abstract
Circuit breakers with automatic transfer switches (ATS) are designed in such a way that when the voltage disappears during a short-circuit (SC) in the ring network line, the ATS device is triggered. At the same time, its switch is turned on at short-circuit, then it is turned off with acceleration. Even a shortterm switching on of the automatic transfer switch for a sustained short-circuit leads to emergency situations [1,2]. The electrical equipment of the ring network spare line is exposed to high emergency short-circuit currents, and the consumers powered by the spare transformer are turned off. It is possible to minimize and eliminate the damages caused by the above mentioned cases by inhibiting the switching on of the circuitbreaker of the automatic transfer switch.
Highlights
This method makes it possible to inhibit the switching on of the circuit breaker of the automatic transfer switch in the ring network for a sustained short-circuit; it is based on the principles of remote control of the operation of the circuit-breakers [3]
The time of the appearance of the second inrush of the short-circuit current is monitored by controlling the time of the no-current pause of the automatic reclosing after the disappearance of the short-circuit current at the end of the first inrush of the short-circuit current
The work of the method for inhibitingan automatic transfer switch of the circuit-breakerfor a sustained short circuit is carried out as follows.In normal mode of operation, the sectionalizing circuit-breaker is on and the circuit-breaker of the automatic transfer switch point is off.At the output, due to the operating current,there is a certain value of the output signal, not sufficient for the operation of the short-circuit current sensor, the presence of the output signal at one of the inputs of the circuit elements is insufficient for their operation
Summary
This method makes it possible to inhibit the switching on of the circuit breaker of the automatic transfer switch in the ring network for a sustained short-circuit; it is based on the principles of remote control of the operation of the circuit-breakers [3]. The method gives the opportunity to determine the location of the short circuit In case, if it happened on a section of the line, adjacent to the circuit-breaker of the automatic transfer switch, the switching on for a stable short circuit of the ATS circuit-breaker is inhibited [4,5]. At the beginning of the overhead line, powered from the busbars of the power source, the short-circuit current is monitored In this case, from the moment the short-circuit current appears, the amount of time, set by the operation time of the protection of the sectionalizing circuit-breaker, located in the power supply line together with the network ATS point, is counted [6,7]. An inhibition signal to switch on the circuit-breaker of the automatic transfer switch is given and the presence of a sustained short circuit in this line is established
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