摘要
针对近期某发电厂发生的灭磁开关烧毁事故，介绍了由双断口灭磁开关（FMK）和ZnO非线性电阻构成的灭磁系统的工作原理，分析了其灭磁失败的主要原因，并提出了减轻灭磁开关灭弧负担，保证灭磁成功的改进措施：①降低ZnO非线性电阻的残压；②在ZnO非线性电阻两端并联线性电阻，以得到一条近似SiC非线性电阻的伏安特性。现场工业试验已验证其有效性。
Due to the accident a de-excitation breaker was burned in a power plant lately. This paper introduces the principle of de-excitation system which consists of a double-break de-excitation breaker and ZnO non- Ohmic resistor. The cause of the main failure of de-excitation is analyzed. This paper also presents improvement in reducing the arc-extinguishing burden of de-excitation breaker to ensure the successful de-excitation, i.e., decreasing the residual voltage of ZnO non-Ohmic resistor and paralleling resistor between the terminals of ZnO non-Ohmic resistor to approach the VA characteristic of SiC non-Ohmic resistance. Field test was done to verify the validity of the proposed measures.
出处
《电力系统自动化》
EI
CSCD
北大核心
1999年第22期54-55,57,共3页
Automation of Electric Power Systems
关键词
水轮发电机
故障
灭磁
非线性电阻
发电机
excitation equipment de-excitation breaker non-Ohmic resistor
