Influences of Closing Phase Angle and Frequency on Electrodynamic Stability of Air Circuit Breaker
Influences of Closing Phase Angle and Frequency on Electrodynamic Stability of Air Circuit Breaker
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DOI：
10.1109/tcpmt.2015.2511180
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Jianyu Qu;Qian Wang;Zhiwei Liu;Hu Zhao;Xingwen Li
中科院分区：
文献类型：
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作者：
Jianyu Qu;Qian Wang;Zhiwei Liu;Hu Zhao;Xingwen Li
短时耐受电流是空气断路器的一个重要参数，容易引起电动稳定性问题。研究了合闸相角和合闸频率对交流断路器电动稳定性的影响。考虑集肤效应、相间效应和铁磁体的非线性B-H特性，基于三维瞬态有限元法建立了三相交流断路器的计算模型。结果表明，当合闸相角分别等于φ - π/2、φ + π/6和φ + 5π/6时，可动导线A5、B1和C1的电动稳定性最差，其中φ为电压和电流的相角差。随着频率从50 Hz增加到100 Hz和200 Hz，B相和C相的峰值电流和排斥力的斜坡形分布变为谷形分布，在Icw开始阶段，B1相的峰值电流分别增加了20%和38.6%，在Icw周期阶段分别增加了12.5%和26.4%。另外，频率的增加也会使相邻相的可动导体的侧向力峰值显著增大。
Short-time withstand current (Icw) is an important parameter for air circuit breakers (ACBs) and easily causes electrodynamic stability problems. This paper is aimed to investigate the influences of the closing phase angle and frequency on the electrodynamic stability of ACB. Considering the skin effect, the interphase effect, and the nonlinear B-H characteristics of ferromagnet, a calculation model of a three-phase ACB is built based on the 3-D transient finite-element method. It is found that the movable conductors A5, B1, and C1 show the worst electrodynamic stability when the closing phase angle (ψ) is equal to φ - π/2, φ + π/6, and φ + 5π/6, respectively, where φ is the phase angle difference between the voltage and the current. With the frequency increasing from 50 Hz to 100 and 200 Hz, the slope-shaped distribution of peak currents and repulsion forces in phases B and C is changed to the valley-shaped distribution, and the peak current of B1 is increased by 20% and 38.6% at the beginning stage of Icw, and by 12.5% and 26.4% at the periodic stage of Icw, respectively. In addition, the peak lateral forces of the movable conductors adjacent to other phase are also increased considerably by increasing frequency.