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Feng Z.,Hebei University of Technology | Han L.,Hebei University of Technology | Wen X.,Hebei University of Technology | Zhou M.,Hebei University of Technology | Zhou M.,Changshu Switchgear Manufacturing Co.
Proceedings of the 5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014 | Year: 2014

This paper aimed to investigate the influence of saltspray experiment to electrical contact performance between circuit breaker's main circuit busbar and bridge type contact. Put these samples in different concentration of salt fog to conduct accelerated corrosion test. What's more, developed equipment that can precede auto-complete texting contact resistance, save and analysis the text data at the same time. The equipment used the four-terminal method and relied on the on-off process of programming control relay to switch detection channel to text the contact voltage drop one after another. Focused on the test data fitting process and created GM(1,1) model based on the measured data to proceed grey forecast to predict whether the main circuit would invalid within the set lifetime from manufacturers. Source

Guan R.,Changshu Switchgear Manufacturing Co. | Liu H.,Changshu Switchgear Manufacturing Co. | Yin N.,Changshu Switchgear Manufacturing Co. | Yanfenghe,Changshu Switchgear Manufacturing Co. | Chen D.,Xian Jiaotong University
IEICE Transactions on Electronics | Year: 2011

With measuring the arc current, arc voltage and arc images, the high-current air arc commutation process across the separated electrodes was investigated. It shows that the existence of a short stable arc in the gap may increase the current commutation time. According to the energy balance of the arc column, the conditions to maintain the short stable arc were introduced and the effects of the current limiting resistance on the current commutation process were discussed. Copyright © 2011 The Institute f Electronics, Information and Communication Engineers. Source

Zhang F.-M.,Suzhou University | Zhang F.-M.,Changshu Switchgear Manufacturing Co. | Wang F.-D.,Suzhou University | Yang J.,Changshu Switchgear Manufacturing Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2010

Two kinds of contact driving structures of ZN85A-40.5 vacuum circuit breaker are introduced, and their action processes are simulated by ADAMS (Automatic Dynamic Analysis of Mechanical Systems) and tested on prototypes. Base on the data their characters are analyzed, and the result shows that the disk-spring structure is more stable. Source

Tiansheng Z.,Xian Jiaotong University | Tiansheng Z.,Changshu Switchgear Manufacturing Co. | Nairui Y.,Changshu Switchgear Manufacturing Co. | Shenli J.,Xian Jiaotong University | And 2 more authors.
2015 3rd International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2015 | Year: 2015

In low-voltage apparatus, characteristics of the arc motion can be influenced by magnetic field, gas flowing, electrical field etc. Many studies have been done to investigate effect of magnetic and gas flow force to the arc movement. In this paper, a 2D MHD model is established to analyze arc separating process across the splitter plates. High resistance electrode is introduced to simulate voltage gradient between splitter plates because of voltage drop effect. Distributions of temperature and electric field intensity are analyzed in parallel electrodes model. Based on optimization of electric field, a gradually closing electrodes structure is designed and the corresponding simulation model is calculated. The results of simulation and experiment are consistent. © 2015 IEEE. Source

Wang X.,Changshu Switchgear Manufacturing Co. | Li Z.,Changshu Switchgear Manufacturing Co.
Proceedings of the 5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014 | Year: 2014

This paper introduces the Failure Mode Effect Analysis method, which is applied in the design of the electric and electronic products. The IGBT driven circuit of the inverts is chosen as an example in order to explain clearly how to use the FMEA method. Using this method, the efficiency of the designers and the reliability of the product can be improved greatly. Source

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