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access icon openaccess Optimal design of the mechanical switch suitable for the ATS

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 04/09/2018, Accepted 19/09/2018, Published 26/10/2018

The automatic transfer switch (ATS) is a medium-voltage switchgear, which can improve the reliability and quality of the power supply. The mechanical switch is an important part of the ATS based on the LC resonance, and its breaking time directly affects the overall switching time of the ATS. In order to reduce the breaking time and improve the breaking performance, the optimal design of the mechanical switch is made. Firstly, the working principle of the ATS based on the LC resonance is introduced, the general technical scheme of the magnetically controlled mechanical switch is given, and then, two aspects of increasing the voltage of the driving power supply and the size of the discharge capacitance are considered to reduce the breaking time. Experimental results show that the breaking time of the magnetically controlled mechanical switch is significantly reduced from 15 down to 6.39 ms or so by optimising the design, and the breaking performance is effectively improved, which is conducive to the design of the ATS based on the LC resonance.

Inspec keywords: power supply quality; power system reliability; switchgear

Other keywords: ATS; time 15 ms to 6.39 ms; power supply reliability; LC resonance; magnetically controlled mechanical switch; breaking time reduction; automatic transfer switch; optimal design; breaking performance; medium-voltage switchgear; discharge capacitance; switching time; driving power supply voltage; power supply quality

Subjects: Switchgear; Reliability; Power supply quality and harmonics; Control of electric power systems

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