自适应接地距离继电器的研究

Study of Adaptive Grounding Distance Relay

根据自适应距离继电器的构成原则,提出了一种基于零序电压极化的自适应接地距离继电器。由于经过渡电阻单相接地时,测量点的零序电压与故障点的故障相电压有完全相同的变化规律,故能根据过渡电阻的大小自动调整动作边界,对接地电阻有很强的自适应能力。分析表明继电器的动作特性不受过渡电阻、负荷电流的影响,也不受继电器是位于送电侧还是受电侧的影响,同时具有明确的方向性。Matlab仿真分析结果也证明了该继电器的优良动作特性。

A new adaptive ground distance relay based on zero sequence polarizing voltage is put forward according to constitutive principles of adaptive distance relay. Automatic adjustment of protection trip boundary is caused by transition resistance because the variational regularity of zero sequence voltage of measurement position is the same as that of fault voltage of trouble spots when single-phase grounding fault occurs through transition resistance. The adaptive distance relay has stronge adaptive capability to transition resistance. Analysis results show that the operation characteristics of relays with precise direction are not affected by transition resistance and load currents wherever the relay is located at the sending terminal or receiving terminal. Simulations by Matlab also prove the relay has good operating characteristic.