描述

1C31227G01

正序、负序、零序的出现是为了分析在系统电压、电流出现不对称现象时，把三相的不对称分量分解成对称分量及同向的零序分量。只要是三相系统，就能分解出上述三个分量。对于理想的电力系统，由于三相对称，因此负序和零序分量的数值都为零。当系统出现故障时，三相变得不对称了，这时就能分解出有幅值的负序和零序分量度了，因此通过检测这两个不应正常出现的分量，就可以知道系统出了毛病。下面再介绍用作图法简单得出各分量幅值与相角的方法，先决条件是已知三相的电压或电流，当然实际工程上是直接测各分量的。
零序电流保护：利用接地时产生的零序电流使保护动作的装置，叫零序电流保护。在电缆线路上都采用专门的零序电流互感器来实现接地保护。零序电流保护：中性点直接接地系统发生接地短路，将产生很大的零序电流，利用零序电流分量构成保护，可以作为一种主要的接地短路保护。零序过流保护不反应三相和两相短路，在正常运行和系统发生振荡时也没有零序分量产生，所以它有较好的灵敏度。、
但零序过流保护受电力系统运行方式变换影响较大，灵敏度因此降低，特别是短距离线路上以及复杂的环网中，由于速动段的保护范围太小，甚至没有保护范围，致使零序电流保护各段的性能严重恶化，使保护动作时间很长，灵敏度很低。

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1C31227G01

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