摘要
介绍了某水电厂发电机组灭磁及过电压保护装置的设计原理:正常停机时不跳灭磁开关,利用晶闸管灭磁;事故情况下跳开灭磁开关,其常闭辅助接点接通,将转子能量主要消耗在电阻上。但在实际运行中会遇到灭磁开关触头烧毁,限压二极管损坏等问题。通过理论分析并进行了2次技术性改进:一次是利用非线性电阻及二极管的特性形成续流分流,但效果并不理想;第2次是采用高能氧化锌压敏电阻及DM4双断口灭磁开关,最终达到了灭磁及过电压保护装置快速可靠的效果。
The design principle of demagnetization and overvoltage protection for hydropower plant generator set is introduced：the demagnetization switch is not tripped during normal shutdown while the thyristor is used for rotor demagnetization;the demagnetization switch is tripped during incidents while the energy of rotor is consumed on a resistor via its normal-close contactor. But in practical operation,the demagnetization switch and the voltage-limiting diode are burned sometimes. Based on the theoretical analysis,technical improvement is carried out ：the nonlinear resistance and diode are used first to form a current branch,but the effect is not satisfactory,the zinc oxide resistor and DM4 demagnetization switch are then applied,which assures the fast and reliable demagnetization and overvoltage protection.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第6期143-145,共3页
Electric Power Automation Equipment
关键词
发电机组
灭磁
过压保护
氧化锌阀片
改进
generator set
demagnetization
overvoltage protection
zinc oxide valve
improvement
