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Method of differential protection in the power distribution networks based on phase difference principles

机译:基于相差原理的配电网差动保护方法

摘要

The invention relates to a method of differential protection in the power distribution networks based on phase difference principles. The method comprises the following steps: collecting the current and voltage signals of each loading switch; calculating phase difference between the corresponding currents at two adjacent loading switches, wherein at least one of the two adjacent loading switches accords with ΔIϕ maxn·ΔIT+ΔIdz; tripping the two adjacent loading switches if the phase difference corresponding to the two adjacent loading switches being greater than a threshold then a section between the two adjacent loading switches being determined as a fault section. The method only needs to calculate the phase difference between the corresponding currents at the two adjacent loading switches, and achieves the fault determination according to the phase difference being greater than the threshold. The method has low data synchronizing requirements, and processes the fault determination according to the collected signals. The time required for the entirely determining process is short, and a fast protecting response is achieved, thus the problem of slowly protecting response in the existing relay-protection method for the power distribution networks is solved.
机译:本发明涉及一种基于相位差原理的配电网中的差动保护方法。该方法包括以下步骤:收集每个负载开关的电流和电压信号;以及计算两个相邻的负载开关处的相应电流之间的相位差,其中两个相邻的负载开关中的至少一个符合ΔI ϕmax T +ΔI< Sub> dz ;如果对应于两个相邻负载开关的相位差大于阈值,则使两个相邻负载开关跳闸,则将两个相邻负载开关之间的区间确定为故障区间。该方法仅需计算两个相邻负载开关处的相应电流之间的相位差,并根据该相位差大于阈值即可实现故障判断。该方法对数据的同步要求低,并根据采集到的信号进行故障判断。整个确定过程所需的时间短,实现了快速的保护响应,从而解决了现有配电网继电保护方法中保护响应缓慢的问题。

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