零序电压移相极化的自适应阻抗继电器研究

Study on adaptive impedance relay with zero sequence voltage phase shifting and polarization

提出了一种基于自适应原理的新型接地阻抗继电器。在对零序电压极化的自适应阻抗继电器动作特性分析的基础上,通过对接地距离保护对过渡电阻自适应构成机理的分析,阐述了零序电压移相极化的自适应控制方法及移相原理。讨论了该继电器的动作判据,分析了其动作特性。初步理论分析表明所提继电器具有动作迅速、构成简单等良好性能。分析还表明,零序电压移相后的自适应阻抗继电器既进一步提高抗过渡电阻的能力,又不存在动作的电压死区,具有明确的方向性。同时,它还具有故障分量继电器所特有的不受负荷、系统振荡等因素影响的特点。Matlab仿真分析结果表明,该继电器具有良好的动作特性。

A grounding impedance relay based on adaptive principle is proposed. Based on the characteristic analysis of the adaptive impedance relay with zero sequence voltage polarization,the adaptive control method of zero sequence voltage phase shifting and polarization and the principle of phase shift are explained by analyzing the adaptation mechanism of grounding distance protection to transition resistance. Its action criteria are given and its operating characteristics are demonstrated. The theoretic analysis shows that, the relay has better performance,such as quick response and simple composition. Tests show that,the relay enhances its ability of transition resistance adaptation and has explicit direction without voltage dead zone. As fault component relay,it is not affected by load components and power system vibration. Simulative analysis with Matlab proves that,it has excellent operating characteristics.