Adaptive Single-pole Auto-reclosure for Transmission Lines Using Sound Phases Currents and Wavelet Packet Transform

作者：Jamali Sadegh; Ghaffarzadeh Navid

来源：Electric Power Components and Systems, 2010, 38(14): 1558-1576.

DOI：10.1080/15325008.2010.482556

• adaptive auto-reclosing
• permanent faults
• secondary arc
• transient faults
• transmission lines
• wavelet packet transform

This article presents a novel approach for adaptive single-pole auto-reclosing of power transmission lines under transient single-phase fault conditions by using a wavelet packet transform. In the proposed method, the mode current (sum of the currents of the two healthy phases) is captured with a sampling rate of 10 kHz and de-noised using the db8 wavelet packet to obtain signals with higher signal-to-noise ratio. The db8 wavelet packet is then used to decompose the mode current signal to attain the coefficients of wavelet nodes 131, 133, 134, 136, 137, 139, and 140 and to define an index, which is the sum of the absolute values of these node coefficients. The index is used to distinguish transient (arcing) faults from permanent faults and also to identify the secondary arc extinction instant. The proposed method has been successfully tested under a variety of fault conditions on a 500-kV overhead line using electromagnetic transient program. The test results validate the algorithm ability in distinguishing between transient and permanent faults and determining the instant of secondary arc extinction. The significant advantage of the proposed algorithm is that it does not need a case-based threshold level, and therefore, its performance is independent of fault location, line parameters, and pre-fault line loading conditions. Moreover, the algorithm can be used in transmission lines with reactor compensation.

• 出版日期2010