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故障相接地消弧裝置不能100%判相的原因分析
【日期】 2013年10月15日   【瀏覽】 [1431]
故障相接地消弧裝置不能100%判相的原因分析

  故障相接地消弧裝置不能100%判相的原因分析

  在單相弧光接地時:

  在熄弧期間,故障相微機采樣的是故障相電壓,對于健全相微機采樣的是本相電壓;

  在燃弧期間,對于故障相微機采樣的是故障相接地電壓,對于健全相微機采樣的是線電壓;

  對于單相弧光接地,只有故障相接地發生在最大時刻,這一點上,燃弧才=10ms,其它任何一個時刻發生單相接地燃弧時間都<10ms。

  因此,微機在10ms時間段內采樣的交流信號是幅值、相位不同的兩個交流信號,而微機計算按照是一個交流信號處理運算,得出的結果肯定錯誤。消弧控制器根本無法100%準確判斷故障相。

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