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access icon openaccess Investigations on the safe stroke of mechanical HVDC vacuum circuit breaker

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 23/08/2018, Accepted 22/10/2018, Revised 08/10/2018, Published 29/10/2018

Here, a DC vacuum arc interruption test based on the hybrid high-speed actuator and the method of commutation is carried out in the synthetic loop system. The safe stroke is one of the basic breaking parameters. The minimum safe stroke directly determines the commutation time and breaking property of the mechanical DC vacuum circuit breaker. The main circuit breaker is a high-speed vacuum switch driven by electromagnetic repulsion actuator. In order to simplify its control system, the commutation switch also adopts high-speed vacuum switch. The main current source for verification test of this DC breaker system is provided by a LC oscillator circuit with lower frequency. Simulations with some experiments were completed on breaking process of this system by PSCAD. The breaking current is 4 kA by the DC breaker system proposed here, the opening speed is about 2.417 m/s in this experimental system; From the results, the simulation and experimental waveforms are compared and analysed, and some effects on safe stroke of the DC vacuum circuit breaker is studied. The shortest arcing time is about 0.89 ms and the minimum safe stroke is about 2.15 mm under the lower voltages.

Inspec keywords: electromagnetic actuators; HVDC power convertors; circuit-breaking arcs; vacuum circuit breakers

Other keywords: basic breaking parameters; DC breaker system; main circuit breaker; mechanical DC vacuum circuit breaker; mechanical HVDC vacuum circuit breaker; arcing time; commutation switch; breaking current; opening speed; velocity 2.417 m/s; commutation time; synthetic loop system; LC oscillator circuit; DC vacuum arc interruption test; current 4.0 kA; high-speed vacuum switch; main current source; control system; electromagnetic repulsion actuator; PSCAD; breaking property; breaking process; size 2.15 mm; time 0.89 ms; hybrid high-speed actuator; minimum safe stroke

Subjects: Control of electric power systems; Electromagnetic device applications; Switchgear; Control gear and apparatus

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