Abstract
The over-load protective relay is widely used for motor protection. The reliability of the over-load protective relay directly affects the safe running of a motor. The reliability testing and reliability analysis of the over-load protective relay is an important way to improve the reliability of products. In this paper, the reliability test method of the over-load protective relay is studied, and the reliability tests of the typical products are carried out on a reliability tester developed by authors. In terms of the testing results, the reliability analysis is finished. The failure reasons are found and the measures are put forward to improve the reliability of the products.
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References
Bates, J., Hamilton, D., Tompkins, T., 1998. Using Visual C++ 6. Que Corp, USA.
GB14048.6-1998, 2001. Low-voltage Switchgear and Controlgear Contactors and Motor-Starters. China Standard Press, Beijing (in Chinese).
He, G.P., 2000. Correct regulation and use are important factors of realizing the action stability of thermal relays. Electric Switchgear, (6):4–6 (in Chinese).
Hu, X.F., Gao, H.Y., Mao, J.H., 2004. Discussing the effects of contact surface coarseness on contact resistance. Electrical Engineering Alloy, (1):14–16 (in Chinese).
Li, K., Yao, F., Lu, J.G., Li, Z.G., 2000. Test and Analysis of Reliability for Electromagnetic Relay. Proceedings of the 46th IEEE Holm Conference on Electrical Contacts, Chicago, p.79–82.
Lu, J.G., Wang, J.Q., 2004. Reliability Theory and Applications of Low-voltage Protective Electrical Apparatus. Mechanical Industries Publishing Company, Beijing, p.99–111 (in Chinese).
Luo, Y.Y., Lu, J.G., Li, Z.G., Lu, B., 1999. Study on Methods of Reliability Test for Switches. Proceedings of 47th Relay Conference, California, p.6-1–6-6.
Wu, C.P., Chen, J.C., Zhou, X.L., Li, Y.H., Xian, C.Q., 2005. Silver based eelctric contact material. Yunnan Metal Lurgy, 34(1):46–51 (in Chinese).
Zhao, J.Y., Lu, J.G., Wang, H.T., Liu, G.J., 2006. Study on Reliability Test Method of Over-load Relay. Proceedings of the Fifty-Second IEEE Holm Conference on Electrical Contacts, Montreal, p.58–62.
Zhou, J., 2000. Manufacture technics and design analysis of heat-bimetal system of thermal over-load relay. Machine Tool Electric Apparatas, (1):4–10 (in Chinese).
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Project (No. E2005000039) supported by the Natural Science Foundation of Hebei Province, China
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Zhao, Jy., Chen, Hj., Liu, Gj. et al. Reliability testing and reliability analysis of the over-load protective relay. J. Zhejiang Univ. - Sci. A 8, 475–480 (2007). https://doi.org/10.1631/jzus.2007.A0475
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DOI: https://doi.org/10.1631/jzus.2007.A0475
Key words
- Over-load protective relay
- Protective success ratio
- Sampling and checking plan
- Reliability testing
- Reliability analysis