3AUA0000070792/ZINT-511 配電網中性點采用小電流接地方式有著一系列的優點，所以被很多國家的配電系統采用。但是由于小電流接地電網單相接地時故障電流非常小，單相接地保護問題一直沒有很好地解決。事實上采用常規繼電保護裝置根本無法檢測出故障線路，故障選線必須采用專用選線裝置。這種專用裝置80年代就已經在我國誕生，但由于選線問題的復雜性，這些裝置選線正確率非常低，以至于還得采用手動拉路的辦法選線。
我國現有的選線裝置在理論上多采用零序電流高次（以五次為主）諧波原理來實現故障選線。但是，由于裝置要使用的諧波分量在信號中所占比例較小，難于分離和提取，以及負荷的諧波干擾，使基于諧波原理的裝置在實際運行中出現誤判。其余多數選線方法都是基于故障后的穩態信號進行分析，但小電流接地電網穩態時的接地電流很小，使基于幅值比較的保護選線精度降低，基于相位比較的保護容易誤選。
鑒于存在的這些問題和生產實際的需要，我們設計了這套故障選線裝置。它利用小波變換提取暫態突變信號中的特征分量，應用暫態信息進行選線，解決了傳統選線方法利用穩態信息進行選線準確率低的問題，增強了抗干擾能力。此外本裝置適用于所有小電流接地系統，包括只裝設兩相電流互感器的小電流接地系統，克服了以往提出的多數選線方法在系統只裝設兩相電流互感器的情況下失效的缺陷。
3AUA0000070792/ZINT-511
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