Approach for electrodynamic force for compensation in low voltage circuit breaker WP 630-1.2 type
LU Na, XU L.J., Miedziński B.
Automation School, Beijing University of Posts and Telecommunications, Beijing 100876, China; Electrical Power Engineering Institute, Wroclaw University of Technology, Wroclaw, Poland
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.
LU Na, XU L.J., Miedziński B.. Approach for electrodynamic force for compensation in low voltage circuit breaker WP 630-1.2 type. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(3 ): 8-.
HOSSEINI Mehdi, SHAYANFAR Heidar Ali, FOTUHI-FIRUZABAD Mahmud. Modeling of D-STATCOM in distribution systems load flow[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(10): 1532-1542.
