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The impact phenomenon of vacuum interrupters is a basic event while closing a vacuum circuit breaker. It reveals lots of information including the maximum impact force applied on the vacuum circuit breaker. And this impact force might lead to a mechanical failure of vacuum interrupters, mechanical structures of VCB and etc. The objective of this paper is to investigate non-synchronous impact phenomena...
The contacts closing impact phenomenon of vacuum interrupter is a basic event in a vacuum circuit breaker, which reveals lots of information including impact force, bouncing duration, stress distribution and so on. The objective of this paper is to investigate the contacts impact phenomenon in a 126 kV vacuum circuit breakers. PVDF (polyvinyldene fluoride) piezoelectric sensors were used to measure...
A new type of “dual-contact” structure of vacuum interrupter is proposed in the paper. It consists of main contact and arc contact, which are used to carry rated current and break short circuit current, respectively. During the closing/opening of vacuum circuit breaker, arc contact is first closed and post breaking, however, main contact is post closed and first breaking. So there must be the current...
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...
This paper introduces the principle part of fault diagnosis and automatic reclosing phase selection for TMS320VC5402 digital signal processor as the core of high voltage circuit breaker intelligent releaser. This releaser has the following functions: tripping function; Measurement function; Diagnosis function; Automatic reclosing phase selection function. It To has important practical significance...
This paper introduces software and hardware design part of TMS320VC5402 digital signal processor as the core of high voltage circuit breaker intelligent releaser. This releaser has the following functions: tripping function; Measurement function; Diagnosis function; Automatic reclosing phase selection function. It To has important practical significance to improve the level of the intelligent high...
A new type of “dual-contact” structure of vacuum interrupter is proposed in the paper. It consists of main contact and arc contact, which are used to break short circuit current and carry rated current, respectively. Using double-bellows, the contact bounce can be substantially reduced. In order to increase short circuit current breaking capacity of large-current vacuum interrupter, an optimal design...
Spring type operating mechanism is widely used in high voltage circuit breakers. We investigated displacement characteristics of moving contact in opening and closing operation and how it is influenced by design of the spring type operating mechanism. Dynamics models were set up to demonstrate the relationship between displacement characteristics including initial opening speed, average opening speed,...
In this paper an intelligence recloser with faults breaking and synchronizing make function based on DSP is presented. During breaking the short circuit current, the current change rate is adopted to judge whether the short circuit taking. In this paper the four reclosing possibilities are analyzed and simulated in order to find the voltage optimum inputting angle, at the same time short circuit faults...
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