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This paper focused on a fast mechanical switch applied in 2kV hybrid DC contactor. An integrated design of vacuum switch based on Permanent Magnetic Actuator (PMA) is proposed. The stainless steel bellows is removed to avoid vacuum failure caused by air leakage and eliminate restriction of bellows' fatigue life compared to conventional vacuum switch. Both monostable structure and compact springs'...
The objective of this paper is to improve the fatigue life of a contact spring pin in a 126 kV vacuum circuit breaker (VCB). Firstly, the fatigue life of the contact spring pin during the opening or closing operation of the 126kV VCB is analyzed. Secondly, an orthogonal experimental method is used for the improvement of the fatigue life of the contact spring pin, in which three impact factors are...
With a capacity increase of the power system, the fault current increases very quick and it becomes a threat for other equipment in the power system. Vacuum interrupter combined with an electromagnetic repulsion mechanism can achieve a very fast opening operation. It can be designed to interrupt the high fault current approaching a zero-crossing point so that the interrupting capacity can be enhanced...
Compliance is an important property in machine, but mechanism to realize compliance is not adequate to the demand. In this paper, the variable stiffness linkage (VSL) was designed to achieve safety assurance, stability improvement and energy conservation in robots and mechanical applications. Stiffness change could be realized by changing the position of the slider on each leaf spring. In order to...
The study of quadruped robots is an important branch of robotics. As is known to all, quadruped robots can go through the rough terrain easily and they are useful in field operation. Whether quadruped robot can interact softly with the environment is an important index to value its property. This paper presents the preliminary research of a quadruped robot, mainly focus on the mechanical design and...
${\rm SF}_{6}$ circuit breakers are widely used, to safely and reliably protect the high-voltage (72.5–1000 kV) power system. However, ${\rm SF}_{6}$ is a greenhouse gas. It is necessary to develop high-voltage vacuum circuit breakers (VCBs) instead of ${\rm SF}_{6}$ circuit breakers above 110-kV power systems. To obtain the optimum performance from a high-voltage VCB design, the mechanism design...
Occasionally closing operation failures occurred when a spring type operating mechanism was used to operate a high voltage circuit breaker with higher loads. This kind of failures is a high risk for circuit breakers. The objective of this paper is to propose a concept of reset time difference of a trip-open unit and to improve the reliability of closing operation of a high voltage circuit breaker...
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