| 引用本文: | 贾文超,黄少锋,焦利霞.双频注入式定子单相接地保护方案[J].电力自动化设备,2014,34(6): |
| JIA Wenchao,HUANG Shaofeng,JIAO Lixia.Stator single-phase grounding protection with double-frequency injecting source[J].Electric Power Automation Equipment,2014,34(6): |
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| 摘要: |
| 从注入式定子接地保护灵敏度、滤波器参数设计和信号提取的简便性等方面对高频段注入信号频率的取值范围进行分析。分析结果表明：当注入频率大于 50 Hz时，保护的灵敏度随注入频率的增加而降低，且滤波器电感所承受的谐振电压和工频电压随注入频率的增大而减小。最后确定了高频段信号的注入频率为80 Hz。给出了一套双频注入式定子接地保护方案，该方案能实现发电机的全工况运行的接地保护功能。 |
| 关键词: 发电机 定子接地保护 双频注入式 继电保护 灵敏度分析 |
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| Stator single-phase grounding protection with double-frequency injecting source |
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JIA Wenchao1, HUANG Shaofeng1, JIAO Lixia2
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources，North China Electric Power University，Baoding 071003，China;2.Beijing Sifang Automation Co.，Ltd.，Beijing 100085，China
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| Abstract: |
| The range of high-frequency injecting source for generator stator grounding protection is analyzed from the aspects of protection sensitivity，filter parameter design and signal extraction simplicity. Result shows that，when the frequency of injecting source is higher than 50 Hz，the protection sensitivity decreases along with the frequency increase and the resonant voltage and fundamental frequency voltage exerted upon the inductor of filter reduce along with the frequency increase. The high-frequency injecting source is confirmed to be 80 Hz and a scheme of stator grounding protection with double-frequency injecting source is then proposed，which realizes the generator stator grounding protection in all operating conditions. |
| Key words: electric generators stator grounding protection double-frequency injecting source relay protection sensitivity analysis |
