描述

1C31227G01

正序、負序、零序的出現(xiàn)是為了分析在系統(tǒng)電壓、電流出現(xiàn)不對稱現(xiàn)象時，把三相的不對稱分量分解成對稱分量及同向的零序分量。只要是三相系統(tǒng)，就能分解出上述三個分量。對于理想的電力系統(tǒng)，由于三相對稱，因此負序和零序分量的數(shù)值都為零。當系統(tǒng)出現(xiàn)故障時，三相變得不對稱了，這時就能分解出有幅值的負序和零序分量度了，因此通過檢測這兩個不應正常出現(xiàn)的分量，就可以知道系統(tǒng)出了毛病。下面再介紹用作圖法簡單得出各分量幅值與相角的方法，先決條件是已知三相的電壓或電流，當然實際工程上是直接測各分量的。
零序電流保護：利用接地時產(chǎn)生的零序電流使保護動作的裝置，叫零序電流保護。在電纜線路上都采用專門的零序電流互感器來實現(xiàn)接地保護。零序電流保護：中性點直接接地系統(tǒng)發(fā)生接地短路，將產(chǎn)生很大的零序電流，利用零序電流分量構成保護，可以作為一種主要的接地短路保護。零序過流保護不反應三相和兩相短路，在正常運行和系統(tǒng)發(fā)生振蕩時也沒有零序分量產(chǎn)生，所以它有較好的靈敏度。、
但零序過流保護受電力系統(tǒng)運行方式變換影響較大，靈敏度因此降低，特別是短距離線路上以及復雜的環(huán)網(wǎng)中，由于速動段的保護范圍太小，甚至沒有保護范圍，致使零序電流保護各段的性能嚴重惡化，使保護動作時間很長，靈敏度很低。

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1C31227G01

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