| 由一起事故看励磁试验电源选择计算的误区 |
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| 引用本文： | 兀鹏越,张磊,何信林,王团结.由一起事故看励磁试验电源选择计算的误区[J].华北电力技术,2012(3):19-22,62. |
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| 作者姓名： | 兀鹏越 张磊 何信林 王团结 |
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| 作者单位： | 1. 西安热工研究院有限责任公司,陕西西安,710032
2. 上海电力安装第二工程公司,上海,200235 |
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| 摘 要： | 论述了一起自并励机组启动试验中,由于错误估计了励磁变空载合闸的励磁涌流,导致在励磁变压器低压侧三相短路时保护拒动的事故经过,分析了励磁变空载合闸的励磁涌流产生的机理,指出了电源电压较大幅度低于额定电压时,变压器空载合闸不会产生励磁涌流,在此基础上给出了合理的励磁试验电源继电保护的整定计算方法。
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| 关 键 词： | 励磁变 整套启动 整定计算 励磁涌流 |
Discussion on Calculation Misunderstanding in Power Selection for Excitation Test Based on a Fault |
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| Wu Peng-yue
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Zhang Lei
,
He Xin-lin
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Wang Tuan-jie.Discussion on Calculation Misunderstanding in Power Selection for Excitation Test Based on a Fault[J].North China Electric Power,2012(3):19-22,62. |
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| Authors: | Wu Peng-yue Zhang Lei He Xin-lin Wang Tuan-jie |
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| Affiliation: | 1, Xi＇an Thermal Power Research Institute Co. Ltd. ,Xi＇an 710032, China; 2. Shanghai Power Erection No. 2 Co. , Shanghai 200235, China) |
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| Abstract: | Because of misestimating the inrush current when excitation transformer was no-load closed in a start test of shunt self excitation unit,the protective action was failed when the low voltage side of the excitation transformer occurred three-phase short circuit. This paper analyzed the generation mechanism for inrush current when excitation transformer was no-load closed, and pointed out that when the supply voltage was largely lower than rated voltage,in- rush current would not occur by transformer no-load closing. Based on this analysis,it proposed an reasonable setting calculation method for relay protection of excitation test. |
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| Keywords: | excitation transformer a complete set starting setting calculation inrush current |
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