CVT一次隔离开关操作对变压器过励磁保护影响的研究  

Influence of CVT Primary-Side Isolator Operation on Over-Excitation Protection of Transformer

作　　者：周春雨[1] 刘振[2] 余芳[2] 郭洁[2] 

机构地区：[1]西北电力设计院,陕西西安710032 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《高压电器》2009年第5期112-115,118,共5页High Voltage Apparatus

摘　　要：电容式电压互感器(CVT Capacitor Voltage Transformer)含有电容和非线性电感元件,当一次隔离开关操作时可能引起二次电压异常,影响变电站继电保护装置的正常运行,甚至引起主变过励磁保护误动作。运用ATP建立CVT及其所运行的变电站的等值电路模型,仿真计算一次侧隔离开关操作过程中CVT二次电压情况。比较影响二次侧电压的主要因素,分析在CVT一次侧隔离开关操作过程中主变过励磁保护误动作的原因。正常操作不会引起主变过励磁保护误动作。Capacitor voltage transformer （CVT） contains capacitors and nonlinear inductances, so primary-side isolator operation may cause abnormal secondary voltage to influences normal operation of relay devices in substation, or even to lead misoperations of over-excitation protection for main transformers. This paper establishes equivalent circuits models of CVT and the substation via ATP, and simulates CVT secondary voltage as primary-side isolator operates for determining the main factors which impact the amplitude of secondary voltage, and determining the reasons for misoperating over-excitation protection of main transformers. The result shows that misoperation of over-excitation protection for main transformers will not happen in normal operation.

关 键 词：电容式电压互感器 二次电压 铁磁谐振 过励磁保护 

分 类 号：TM772[电气工程—电力系统及自动化]