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High current z pinches are used for a variety of high energy density physics applications, including inertial confinement fusion research. Present state of the art in single-pulse drivers can deliver twenty megamperes through an imploding plasma load; upon stagnation on the axis the plasma radiates more than a megajoule of energy in a few nanoseconds. Emphasis on fast plasma implosions (one hundred...
Recently, an arcing on satellite solar array due to interaction between space plasma and the array threatening safety of spacecraft is a big issue. The arcing causes degradation of solar array at malfunction of instruments on satellites. The discharge is caused by differential potential between satellite body and insulator surfaces like coverglass of solar array, which are charged by ambient plasma...
Vacuum interrupters (VI) with specific high short circuit interruption ability are mostly equipped with the well known contact material based on copper and chromium. A review of different production techniques as well as behaviour and microstructure of commercially available materials is presented with emphasis on two of the predominantly applied methods. The contact material's switching performance...
In the medium voltage range the vacuum switching principle is well established (Fink and Renz, 2002). Today vacuum circuit breakers are available up to 52 kV rated voltage and 80 kA short -circuit current. Based on long term experiences and knowledge from basic research thermodynamic models for the RMF- and AMF-arc behaviour were developed and are presented in this paper. In the case of RMF-driven...
Controlled switching has been used extensively throughout the whole world for shunt capacitor banks. By precisely controlling where on the voltage waveform the contacts touch, it is possible to greatly reduce the magnitudes of the switching electrical transients. This paper presents the basic principle and the software algorithms of controlled switching for three-phase shunt capacitor banks with ungrounded...
According to the relevant IEC standards vacuum circuit-breakers have to meet various needs, e.g. the interruption capability, making operations, and dielectric strength. Switching of capacitor banks, overhead lines, or cables leads to very small currents in comparison with short-circuit currents. After current interruption the circuit-breaker must withstand twice the peak value of the system voltage...
An analysis of switching processes at interruption of lightly loaded urban and rural networks with the aid of VCB has been provided. It has been found that typical loading of the distribution feeders result in virtual absence of recovery voltage shift being the main reason for non-sustained disruptive discharges (NSDD). Truly unloaded situation is interruption of section located between neighbouring...
Vacuum interrupters form the key component of a medium voltage (MV) vacuum switchgear design. Vacuum interrupter technology is now well established and key manufacturers across the world are routinely producing interrupters for ratings up to 52kVrms. Manufacturers have focused on reducing the cost of interrupter components by adapting to more efficient contact geometry, improved contact materials,...
CAPP, abbreviation for computer aided process planning, is widely used in the process planning of diversified industries. But for the manufacturing of vacuum interrupter, few applications of CAPP are found, besides, most of the existing CAPP systems have the disadvantages of excessively aggrandizing the automation in their planning process, which makes their practicability poor. Based on the discussion...
The author made some discussion and research on the related technical details of the vacuum interrupter computer aided design system. And then, the author developed the vacuum interrupter computer aided design system by using SolidWorks, Visual Basic and Microsoft office Access. The author used Visual Basic to make secondary developing to the SolidWorks, and used Microsoft office Access to manage...
The vacuum circuit breaker (VCB) is a key component to protect electric devices in power receiving and distribution systems. In recent years, the need for a reduction in running costs such as maintenance of VCB as well as the initial cost has arisen. Against this background, we developed BMA (balanced magnetic actuator)-applied VCB which can reduce the number of parts and the sliding elements in the...
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