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CLC number: TB114.3; O224; O211.6

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Received: 2006-12-19

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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.3 P.393~396

10.1631/jzus.2007.A0393


Approach for electrodynamic force for compensation in low voltage circuit breaker WP 630-1.2 type


Author(s):  LU Na, XU L.J., Miedziń,ski B.

Affiliation(s):  Automation School, Beijing University of Posts and Telecommunications, Beijing 100876, China; more

Corresponding email(s):   nalu@bupt.edu.cn

Key Words:  Compensation, Electrodynamic force, FEM (Finite Element Method)


LU Na, XU L.J., Miedziński B.. Approach for electrodynamic force for compensation in low voltage circuit breaker WP 630-1.2 type[J]. Journal of Zhejiang University Science A, 2007, 8(3): 393~396.

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Abstract: 
Undesirable repulsive force between contact members due to both a current path shrink near a real contact area and/or so-called pinch effect is particularly onerous for power switch applications, and results in either contact floating or bouncing which are associated with an electric arc following contact welding. This problem is of great importance for any circuit breaker especially for compact low voltage vacuum circuit breakers. To avoid contact floating at closure and during any inrush current under short circuit conditions, the electrodynamic repulsive force can be employed successfully if we use a special compensation system flexibly combined with the contact itself. However to select and design the compensation system properly, its efficiency has to be known. This paper presents an approach to obtain the electrodynamic force value depending on different shaped (rectangular, square, circle and arch) copper plates used in the compensator by using ANSYS for current values 40 kA RMS. Curve-fitting was done according to the calculating results, the optimization designing of compensation unit is based on them.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] ANSYS 9.0 software, 2005. ANSYS On-line Help.

[2] Flurscheim, C.H., 1975. Power Circuit Breaker Theory and Design.

[3] Holm, R., 2000. Electric Contacts. Theory and Applications, Springer Verlag.

[4] Jin, J.M., 2001. Finite Element Method of Electromagnetic Fields. Publishing House of Xi’an University of Electric Science and Technology, Xi’an (in Chinese).

[5] Kharin, S.N., Nouri, H., Amft, D., 2002. Dynamics of Electrical Contact Floating in Vacuum. Proc. 48th IEEE Holm Conf., p.197-205.

[6] Królikowski, C., et al., 1985. Isolation system of vacuum chamber for circuit breaker. ZNPP Elektryka, (29):39-56 (in Polish).

[7] Miedziński, B., Kowalski, Z., Jarosz, J., 2002. Effect of a Dynamic Force Compensation in a Low Voltage Circuit Breaker. Proc. IEEE African, p.807-810.

[8] Miedziński, B., Szymanski, A., Kowalski, Z., Xu, L.J., Lu, N., 2004. Applicability of On-line Contact Force Compensation in Switchgear. Proc. 1st Int. Conf. on Reliability of Electrical Products and Electrical Contacts, Suzhou, p.51-53.

[9] Moaveni, S., 1999. Finite Element Analysis: Theory and Application with ANSYS. Prentice-Hall, Upper Saddle River, NJ.

[10] Zhang, G.S., 1961. Electronics. Industry Publishing House of China, Beijing (in Chinese).

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