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Making use of arc image gathering system that base on high-speed picture frequency CCD technique, we proceed arc imagine gathering and analysis on CJX1-12/22 AC contactor. During high-speed arc image dynamic shoot process, it inevitably exists noise that coming from many aspects influencing image quality. The arc image analysis mainly concentrates on many aspects such as the motion forms and trend of arc image, the arc chute function of subsection arc extinction and so on. For this kind of special goal, it requests image's edge clear and can be distinguished in order to prominent the function and influence of arc imagepsilas contour. This paper first applies the adaptive median filter to eliminate stochastic noise, and then uses Laplacian sharpening to enhance the edge and the detail of image. The simulation result indicates that this method can effectively remove the noise and the prominent the contour.

According to Hurwitz's criterion, this paper deduces the steady state borderline of steam turbine with AVR on the map of reactive capability curves, using the mathematical model of one machine infinite bus system. It extends steam turbine's safe range under exciting operation compared to generator without AVR, and presents a proposal for the reactive power service market.

In this paper, the cause and its serious hazard of the inter-turn short circuit fault on turbine generator rotor windings are analyzed. Furthermore the electromagnetic characteristics and mechanical characteristics as well as the correlative variety of the electrical parameters induced after inter-turn short circuit fault on turbine generator rotor windings are analyzed. Based on the fault characteristics that the excitation current increased while the reactive power output decreased relatively when the inter-turn short circuit happens, a fault characteristic mathematical model of inter-turn short circuit is founded considering the saturated situation of steam generators.

Node mobility is one of dominant factors causing decreased performance in mobile ad hoc networks and restricting network scalability. Selecting stable paths is an effective way to reduce the impact of node mobility. Current methods of selecting stable paths suffer from several shortcomings. They may need a hardware function support for geographical position location or cross-layer function support for sending signal strength information to upper layers. In this paper a new simple method for selecting stable paths is proposed. This method uses a Neighbor Change Ratio metric and does not require any hardware function or cross layer support. The method selects paths which have small hop counts and stable local topologies. An extension to the AODV routing protocol is used as an example of using the Neighbor Change Ratio metric. The resulting NCR-AODV protocol is simulated under various mobility and traffic scenarios. The results show that the NCR-AODV protocol has a lower long path break probability and improved network performance compared to the AODV protocol