Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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電動(dòng)機(jī)磁平衡差動(dòng)保護(hù)方案及TA選型分析

來源:電工電氣發(fā)布時(shí)間:2016-04-06 10:06 瀏覽次數(shù):20

電動(dòng)機(jī)磁平衡差動(dòng)保護(hù)方案及TA選型分析 

唐海燕 
中核集團(tuán)三門核電有限公司,浙江 臺(tái)州 317112 
 

摘 要:為提高電動(dòng)機(jī)保護(hù)的靈敏性和可靠性,可采用磁平衡差動(dòng)保護(hù)。以三門核電一號(hào)機(jī)組中壓電動(dòng)機(jī)的磁平衡差動(dòng)保護(hù)方案為例,分析了磁平衡電流互感器(TA)的選型配置。給出已有磁平衡TA的選型方法,結(jié)合實(shí)際負(fù)荷要求和短路電流下的動(dòng)熱穩(wěn)定性要求提出當(dāng)前配置存在的問題;給出了變比分別為50/5 和50/1 的磁平衡TA 的改進(jìn)方案。結(jié)果表明,采用15 VA、50/1 的TA 滿足磁平衡保護(hù)要求,在發(fā)生母線三相短路時(shí)不會(huì)飽和,且該方案將大大減小設(shè)計(jì)及改造的工作量。
關(guān)鍵詞:電動(dòng)機(jī);磁平衡差動(dòng)保護(hù);磁平衡電流互感器;選型配置;改進(jìn)方案
中圖分類號(hào):TM32;TM452 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2014)06-0024-03


Motor Flux Balance Differential Protection Plan and TA Selection Analysis 

TANG Hai-yan 
Sanmen Nuclear Power Co., Ltd, Taizhou 317112, China 
 

Abstract: In order to raise sensitivity and reliability of motor protection, flux balance differential protection can be adopted. With medium voltage motor flux balance differential protection plan of Sanmen Nuclear Power Plant unit 1 generators as an example, analysis was made to flux balance current transformer’s (TA) selection and configuration, the existing flux balance current transformer’s selection method given.Combined with actual load requirements and dynamic thermal stability requirements under short circuit current, this paper proposed the problems of the existing configuration and the improved plan of transformation ratio as 50/5 and 50/1 respectively. The result shows that adopting the current transformer of 15 VA, 50/1 meets flux balance protection requirements without saturation at the time of three-phase busbar short circuit. The plan greatly reduces working quantity of design and reformation.
         Key words: motor; flux balance differential protection; flux balance current transformer; selection and configuration; improved plan


參考文獻(xiàn)
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