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As one of the most important electrical components in distribution systems, the Miniature circuit breaker(MCB) has been widely used to protect the electrical equipment. In particular, the low-voltage dc circuit breaker intrigues more and more researchers recently. In this type of circuit breaker, an electric arc is formed in the interrupting process which is a transient arc plasma in a complex chamber...
Researches on electromagnetic repulsion mechanisms are drawing more and more attention globally. The objective of this paper is to develop an electromagnetic repulsion mechanism for a 40.5 kV vacuum circuit breaker and then to make an optimization. Design of experiments (DOE) method are used to screen the prominent factors. Result shows that three impact factors are the prominent factors, which include...
Traditional mechanical OLTC has some disadvantages while changing the taps, such as causing arc, switching slowly, having high malfunction rate. This paper proposed a kind of intelligent OLTC which equips with vacuum interrupters controlled by permanent magnetic actuators (PMA) as its switching parts. In this paper, the overall structure and electrical circuit scheme of the OLTC were designed on the...
The object of this paper is to design a new type railway DC circuit breaker based on the superconducting fault current limiter and artificial current zero method. The DC circuit breaker has a significant advantage in good compactness and high reliability. An experimental prototype was designed which includes a superconducting fault current limiter (SFCL) and a vacuum interrupter. The DC current switching...
The stray parameters of a double-break vacuum circuit breaker (VCB) have a significant influence on the voltage distribution of the two breaks. The stray parameters are equivalent to two main equivalent capacitors. The two main equivalent capacitors are the equivalent break capacitor (C1) and the equivalent capacitor between the middle point of the two breaks and earth (C2). The objective of this...
Breakdowns in the post-arc phase are affected by a combination effect of both plasma and metal vapor. The objective of this paper is to study the breakdown boundary as a function of plasma and metal vapor density. A fully kinetic PIC-MCC model was developed to study breakdowns in the post-arc phase. Relevant collisions were taken into consideration, and an external circuit was added to the model to...
This paper presents a wide input range DC-DC converter with a robust control scheme for high speed generator energy storage systems. As the DC voltage converted from low-voltage high-speed generator may be lower or higher than the battery voltage, a step-up/down converter is needed for energy storage systems. The two-switch Buck-Boost (TSBB) converter is suitable for wide input voltage applications...
A sheath recovery process dominants the initial stage of a dielectric recovery process after interrupting a vacuum arc current. The objective of this paper is to model a post-arc sheath recovery process by using PIC-MCC method. Second electrons, external circuit, and fundamental collisions between particles were taken into considerate in the model. The result shows that the amplitude of post-arc current...
The objective of this paper is to experimentally investigate the DC current switching characteristic of a combined DC circuit breaker. The DC circuit breaker, which is a combination of a DC switch and a fuse, has a significant advantage in full-range DC current switching. When a load current or an over-load current emerges, the DC load switch has the ability to clear the current. However, when a short-circuit...
This paper presents a method to construct a transfer function (TF) of the pulse-forming network by using the latent-roots method for modeling the electrical fast transients/burst (EFT/B) generator. In the TF, two negative real roots characterize the nonoscillation process of the network, while one complex-conjugate pair characterizes the damping-oscillation process. All the four latent roots of the...
This paper presents a survey of the state-of-art of formal verification technique. The expression models for formal verification are introduced and analyzed. The characteristics of each model are expounded. Moreover, the typical model checking techniques are studied. Equivalence checking and property checking are introduced. The development trend for formal verification is discussed.
Artificial neural networks are nonlinear dynamic systems which are constituted of abundant simple processing unites, their characteristics include parallel computing, memory distributing, self-learning and self-organization, etc. They are used to solve many artificial intelligence problems that are very difficult or impossible to be solved by traditional computer. Based on theory of the semiconductor...
To realize systematic analysis for electromagnetic susceptibility (EMS), forecast for electromagnetic compatibility (EMC), a modeling method on electromagnetic interference coupling path of digital relay in power system was presented. The simulated model of electromagnetic interference coupling path can be gotten by this method through the system identifying according to the experiment data. A mathematical...
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