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

Article retrieval

文章檢索

首頁(yè) >> 文章檢索 >> 文章瀏覽排名

PT勵(lì)磁及傳變特性在信號(hào)注入法測(cè)量電容電流中的應(yīng)用

來(lái)源:電工電氣發(fā)布時(shí)間:2018-01-22 09:22 瀏覽次數(shù):623
PT勵(lì)磁及傳變特性在信號(hào)注入法測(cè)量電容電流中的應(yīng)用
 
張利花,伍弘
(國(guó)網(wǎng)寧夏電力有限公司電力科學(xué)研究院,寧夏 銀川 750011)
 
    摘 要:傳遞到電壓互感器(PT)一次側(cè)的實(shí)際電流值與額定值存在一定的誤差,導(dǎo)致計(jì)算出的電容電流誤差較大。以實(shí)驗(yàn)室電磁式電壓互感器為研究對(duì)象,通過(guò)對(duì)PT勵(lì)磁特性的試驗(yàn)研究及試驗(yàn)數(shù)據(jù)的分析,證明在注入不同頻率的信號(hào)時(shí),PT勵(lì)磁特性曲線的飽和特性并不相同,也說(shuō)明注入不合適頻段的信號(hào)時(shí),PT勵(lì)磁特性會(huì)影響信號(hào)注入法測(cè)量電容電流的準(zhǔn)確度。進(jìn)一步對(duì)PT傳變特性進(jìn)行試驗(yàn)研究及試驗(yàn)數(shù)據(jù)分析,設(shè)定了注入信號(hào)的合適頻率范圍,從而改進(jìn)了信號(hào)注入法測(cè)量電容電流的測(cè)量環(huán)節(jié)。
    關(guān)鍵詞:信號(hào)注入法;電容電流;PT勵(lì)磁特性;PT傳變特性;頻率范圍
    中圖分類號(hào):TM451     文獻(xiàn)標(biāo)識(shí)碼:A     文章編號(hào):1007-3175(2018)01-0046-05
 
Application of Excitation and Transmission Characteristic of Potential Transformer in Measurement of
Capacitive Current by Signal Injection Method
 
ZHANG Li-hua, WU Hong
(Power Research Institute of State Grid Ningxia Electric Power Company, Yinchuan 750011 , China)
 
    Abstract: The actual current values delivered to the primary side of the potential transformer (PT) have some errors with the rated values, to result in greater errors in the calculated capacitive current. Taking the electromagnetic voltage transformer in laboratory for example, this paper analyzed the experimental study and test data of PT excitation characteristic to certify that the saturation characteristics of the excitation characteristic curves of the PT were different when signals with different frequencies injected. That’s why the excitation characteristic of PT had great influence on the accuracy in measurement of the capacitive current by signal injection method when the signal was injected into the inappropriate frequency band. Furthermore, the transmission characteristic test of PT was carried out and the test data were analyzed to determine the frequency range of the injected signal, so as to improve the measurement link of the signal injection method of measuring the capacitive current.
    Key words: signal injection method; capacitive current; excitation characteristic of potential transformer; transmission characteristic of potential transformer; frequency range
 
參考文獻(xiàn)
[1] 劉力,孫結(jié)中. 一種測(cè)量配電網(wǎng)容性電流的新方法[J]. 電網(wǎng)技術(shù),2001,25(5):63-65.
[2] 程玉凱,杜文風(fēng). 基于雙信號(hào)法的配電網(wǎng)電容電流測(cè)量[J]. 電測(cè)與儀表,2012,49(5):21-24.
[3] 趙正軍,姜新宇. 信號(hào)注入法在配電網(wǎng)電容電流測(cè)量中的研究[J]. 廣東電力,2004,17(6):25-28.
[4] 李毅敏,蔡旭. 中壓電網(wǎng)對(duì)地電容檢測(cè)的注入信號(hào)源設(shè)計(jì)[J]. 繼電器,2007,35(9):45-51.
[5] 陳麗華.電磁式電壓互感器的原理及幾種測(cè)試方法[J]. 電力與能源,2010(27):36-40.
[6] 杜志葉,阮江軍,王偉剛. 鐵磁諧振仿真模型的改進(jìn)[J]. 繼電器,2004,32(8):26-29.
[7] 阮全榮,王亮,施圍. 一種計(jì)及損耗的變壓器非線性模型[J]. 西安交通大學(xué)學(xué)報(bào),2006,40(10):115-119.
[8] 郭欣沅. 電能計(jì)量系統(tǒng)對(duì)動(dòng)態(tài)信號(hào)傳變特性研究[D]. 北京:華北電力大學(xué),2014.
[9] 崔楊胡,虔生,黃允凱. 任意頻率正弦波條件下鐵磁材料損耗計(jì)算[J]. 微電機(jī),2007,40(8):1-3.
[10] 董張卓,李養(yǎng)俊,徐建軍,等. 用于鐵磁諧振過(guò)電壓計(jì)算的電壓互感器模型[J]. 電力學(xué)報(bào),2012,27(5):463-468.
[11] 吳茂林,崔翔張,衛(wèi)東. 電壓互感器寬頻傳遞特性的時(shí)域測(cè)量方法[J]. 華北電力大學(xué)學(xué)報(bào),2004,31(1):25-28.
[12] 宋曉燕,孫巖洲,宋紫嫣, 等. 基于零序PT二次側(cè)注入信號(hào)的配電網(wǎng)電容電流測(cè)量新方法[J]. 電力系統(tǒng)保護(hù)與控制,2014,25(5):134-138.