Abstract
The paper deals with a key issue, how to limit the hazard and assure reliability, safety and repeatability of operation of selected critical devices protecting electrical power systems. The main research is focused on the incorrect operation of hybrid switches caused by random disturbances of the thyristor gate signals in the electrodynamic drive coil power supply circuit. Firstly, a pilot experiment on the operation of hybrid circuit breaker actuators under random disturbance conditions was carried out and the results are presented. Next, an in-depth operation analysis, based on experimental and simulation research, according to setting conditions of the circuit breaker actuator parameters such as capacitance, voltage and switching time was performed. A simulation study with the use of a field–circumferential model in the Ansys Maxwell program of electrodynamic propulsion of rectilinear motion, which enables energy transfer from the capacitor bank to the actuator coil power supply at selected time intervals, was executed. The study analysed the impact of the discontinuity of energy transfer on the dynamic properties of the actuator and some recommendations for designers and users on how to limit this hazard are formulated.
Highlights
The article concerns the analysis of processes and the operation of hybrid switches [1,2] related to the arcless switching off of short-circuit currents in power circuits operating in difficult environmental conditions [3,4]
Due to the fact that the operation of switching off short-circuit currents refers to emergency states and is essential for the operational safety of the considered power system, the devices performing these operations, usually hybrid switches, belong to the group which can be referred to as critical devices for electric power system operation
Simulation tests showed that if the delay in re-switching the valve does not exceed 1 ms time, the discontinuity of energy transfer has lesser impact than the change of 2% of the achieved maximal disc reach (Figure 11). This fact was confirmed by experimental studies comparing the displacement of the disc in the case of continuous and discontinuous energy transfer for 100 μF, which was only slightly different
Summary
The article concerns the analysis of processes and the operation of hybrid switches [1,2] related to the arcless switching off of short-circuit currents in power circuits operating in difficult environmental conditions [3,4]. In some some cases cases aa malfunction malfunction of of electrodynamic electrodynamic actuator actuator operation operation consisting consisting in in aa discontinuity discontinuity of of energy energy transfer transfer from from discharged discharged capacitors capacitors to to the the drive drive coil coil has has been been noted This phenomenon has been occurring randomly, so it can be considered a kind of hazard noted. New circumferential model of rectilinear propulsion, enabling the analysis of the electrodynamic actuator field–circumferential model of rectilinear propulsion, enabling the analysis of the electrodynamic operation under discontinuous energy transfer to the drive coil. This analysis is related to and focused actuator operation under discontinuous energyin transfer to ultra-rapid the drive coil.
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