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| 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. |
| 关键词: 发电机组 灭磁 过压保护 氧化锌阀片 改进 |
| DOI： |
| 分类号:TV734.2 |
| 基金项目: |
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| Improvement of rotor demagnetization and overvoltage protection |
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DU Jiuqiang1 DUAN Zhenguo2
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| Abstract: |
| 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 anal... |
| Key words: generator set demagnetization overvoltage protection zinc oxide valve improvement |
