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The LM-BP neural network prediction model for contact system electrical endurance of vacuum circuit-breakers is established, which based on the electrical endurance curve and the advanced breaking current weighted cumulative method (BCWC). The influencing factors that affect the prediction of VCBs electrical wear were researched. Then the LM-BP algorithm iterative process of contact electrical wear...
The integral action coefficient value K about the advanced breaking current weighted cumulative method (BCWC) used for the VCBs' contact system electrical endurance monitoring is studied. At first, the general selecting method of integral current coefficient K value is discussed, and the existent problem in the K value selecting, calculating process and potential improving room are analyzed. Considering...
Calculating method of the current index alpha and the theoretical total wear Q is emphatically analyzed based on the electrical endurance curve, which adopt advanced breaking current weighted cumulative method (BCWC) used for predicting the remaining electrical endurance of vacuum circuit breaker (VCBs) contact system. The purpose of this work is to provide a clear and concise engineering description...
In order to reduce the number of accidents and prevent possible troubles due to the failures of VCBs, one valid way is to monitor their performance and condition on-line. Based on the understanding and development of condition based maintenance (CBM) of high-voltage circuit breakers, the authors give some general introduction to electrical endurance on-line condition monitor for VCBs, in which the...
Partial discharge (PD) is the initial sign of power capacitor insulation failure, and an effective extraction and analysis method of PD signal in power capacitor can improve the effectiveness of the on-line fault monitoring. The method which based on wavelet threshold denoising and mathematical morphology alternate mixing filter is put forward in this paper. First, the PD signal which includes noise...
Triggered vacuum switches (TVS), have found fast growing applications in the field of power system and pulse power. The key to perform synthetic making test at full rated voltage for high voltage switches is the making device of current source, so the chief aim of this research is to investigate the triggering feature of TVS, a series experiments have been carried out on the sample TVS especially...
To improve the intelligence and reliability of the vacuum circuit breakers in power gird, a high accurate smart system was designed for On-line condition monitor of vacuum interrupters inner pressure. Through the study of dielectric theory and exploration of the inherent laws of shield potential with different pressure in VIs, it shows that with the deterioration of internal pressure the AC component...
Based on the understanding and development of condition based maintenance (CBM) of high-voltage circuit breakers, the authors give some general introduction to electrical endurance on-line condition monitor for VCBs, in which the stress put on the non-intrusive method and device for determination of the arcing duration. The principle and configuration for arcing duration detect are emphatically expounded...
Triggered vacuum switches (TVS), have found fast growing applications in the field of power system and pulse power. A closing switch is the necessary controlling device of power supply of an ElectroMagnetic Launcher (EML) system and synthetic making test of high-voltage circuit breakers for short-circuit current introduce, which should have the ability to quick connect the circuit and precisely controlling...
Vacuum circuit breakers (VCBs) have operated successfully in medium voltage distribution system to control and protect power lines and power equipments. Once a VCB is unable to interrupt or make current as designed, heavy losses would be brought about to both the power system and the consumers. Inner pressure of vacuum interrupts (VI) is one of the most important parameters for VCBs' safe and steady...
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