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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'...
This paper aims at reliability assessment of power semiconductor in hybrid DC switch. Design considerations of reliability issues are explained. Specific focus is given to a temperature-based condition monitoring technique via thermo-sensitive electrical parameters. VCE, td(off), and dVCE/dt of IGBT are presented as the indicator of junction temperature and calibrated. Comparative experiments with...
With the intelligentization of distribution network, a large scale of power electronic devices are applied in energy conversion. And the system flow of distribution network becomes random and varies greatly, which puts forward higher requirements for measurement and protection. Therefore, it's necessary to detect and identify short-circuit fault rapidly and effectively. In this paper, an early detecting...
In power system, temperature rising caused by longtime overload operation or loading heavy current is one of main factors of malfunction for high voltage electrical equipment. Therefore, the temperature monitoring of high voltage power equipment during operation is very important to ensure the stability and security of power supply. In this paper, a passive wireless temperature measurement system...
DC contactor is one of the key equipment in DC rail traction system. This paper proposes a 2 kV hybrid DC contactor based on natural current transfer. The topology consists of mechanical switch, solid-state switch, passive RCD circuits for snubber and dynamic voltage balancing, and MOV for absorption. Transient characteristics of current transfer, snubber and absorption are studied by theoretical...
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