A 100kV/60A high-voltage power supply (HVPS) has been established to energize the electron cyclotron resonance heating (ECRH) system for J-TEXT tokamak. With the pulse step modulation (PSM) technology, the HVPS has ma...
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The selection of the faulty feeder in the case of single phase-to-earth fault in a Neutral Un-effectively Grounded System (NUGS) has been one of the conventional problems of distribution network. The compensation meth...
The selection of the faulty feeder in the case of single phase-to-earth fault in a Neutral Un-effectively Grounded System (NUGS) has been one of the conventional problems of distribution network. The compensation method is introduced to highlight the difference of the zero-sequence admittances between the faulted feeder and the sound feeder. In this way, the setting of the criterion becomes feasible. The on-site requirement to the protection is also involved in this paper. A variety of simulation tests were carried out by virtue of ATP software. The results demonstrate that this algorithm is immune to the variation of network structures and parameters, fault conditions, and fault resistance etc. The successful rate of feeder selection is proved to be improved to a great extent.
Organic light-emitting diodes (OLEDs) were fabricated on nanostructured aluminum doped zinc oxide (AZO). The nanostructured AZO was formed by selectively etching as-prepared AZO film. The nanostructured AZO serves not...
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On the J-TEXT tokamak, a set of dynamic resonant magnetic perturbation (RMP) coils is installed inside the vacuum vessel to investigate the interactions between rotating RMP and the plasma. The coils are designed oper...
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To fulfill the physical requirement of a 50-100 μm Free Electron Laser (FEL) oscillator, design considerations of a planar undulator are described. Some technical issues, including the tolerances study, the beam matc...
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Recently, a method utilizing pulsed power technology for disintegration of rocks arouses great interest of many researchers. In this paper, an improved method based on magnetic switch and the results shown that the un...
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For pure permanent magnet (PPM) undulator, unavoidable divergences of remanence field and magnetization vector in PM blocks and installation error will cause magnetic field error at the central line of the undulator. ...
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An RF driven plasma exciter for producing negative ions, aiming for plasma heating and current drive in neutral beam injectors for fusion applications, is in developing in Huazhong University of Science and technology...
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A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related *** HRNPG mainly consists of a repetitive charging...
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A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related *** HRNPG mainly consists of a repetitive charging module,a Tesla transformer and a sharpening *** its voltage lower than 1 kV,the primary repetitive charging circuit comprises two fast thyristors as its low-voltage *** spiral Tesla transformer acts as the main step-up component,and its peak transformation ratio is designed to be more than 100.A self-breakdown spark switch,*** sharpening switch,is used to sharpen the output of the transformer and to generate nanosecond *** HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k *** results show,without any magnetic core,the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight,which is of significance for the compactness and portability of the pulse *** N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz.
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