| 1种提高变压器UHF局部放电信号时延精度的统计方法 |
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| 引用本文： | 唐志国,王德玲,李成榕,李君,李金忠.1种提高变压器UHF局部放电信号时延精度的统计方法[J].电力学报,2005,20(4):343-346. |
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| 作者姓名： | 唐志国 王德玲 李成榕 李君 李金忠 |
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| 作者单位： | 1. 华北电力大学高电压与电磁兼容北京市重点实验室,北京,102206
2. 晋中供电分公司,山西,榆次,030600 |
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| 摘 要： | 通过测量变压器局放信号到达UHF传感器阵列各个阵元的时间延迟来进行PD定位在理论上是可以实现的。电磁波在空气中的传播速率是30 cm/ns,所以解决UHF信号被UHF传感器阵列检测到的时间延迟问题是实现PD精确定位的1个关键。本文提出了1种数学方法:互相关—移位—平均算法,这种算法可以通过增加信噪比和降低随机PD带来的分散性来提高UHF信号时延估计的精度。通过对试验数据的验证,显示这种方法在一些情况下可以将时延精度提高到数十个ps,同时将PD定位精度提高到几个厘变。
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| 关 键 词： | 变压器 故障诊断 局部放电检测 |
| 文章编号： | 1005-6548(2005)04-0343-04 |
| 收稿时间： | 2005-07-01 |
| 修稿时间： | 2005-07-18 |
A Statisitic Method to Improve the Time-Delay Accuracy of the Transformer's UHF Part Power Emitting Signals |
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| TANG Zhi-guo,WANG De-ling,LI Cheng-rong,LI Jun,LI Jin-zhong.A Statisitic Method to Improve the Time-Delay Accuracy of the Transformer''''s UHF Part Power Emitting Signals[J].Journal of Electric Power,2005,20(4):343-346. |
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| Authors: | TANG Zhi-guo WANG De-ling LI Cheng-rong LI Jun LI Jin-zhong |
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| Affiliation: | 1. North China Electric Power University, Beijing 102206, China;2.Jinzhong Power Supply Sub-Company, Yuci 030600, China |
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| Abstract: | By measuring the time delay of the transformer-part-power-emitting-signal's reaching the various array units of the sensor,to locate PD is realized in theory.Electromagnetic wave travels at 30 cm/ns in theair.That UHF sensors examine the time delay of UHF signals is the key step in the exact location.This paper puts forward a maths algorithm: interrelevance-translocation-average.This algorithm improves the time delay accuracy by increasing signal's noise ratio and decreasing the scattering brought by PD.The experiment shows that this algorithm may improve the time delay by 10 ps in some situations and improve the PD location accuracy by several centichanges. |
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| Keywords: | transformer faut diagnosis part power emitting examination |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
