開關(guān)柜內(nèi)局部放電電磁波特性分析
霍天
(國網(wǎng)北京市電力公司檢修分公司,北京 100071)
摘 要:為了研究開關(guān)柜中局部放電產(chǎn)生的電磁波特性分布,基于有限元差分法理論,利用三維全波電磁仿真軟件XFDTD對最易發(fā)生故障的電纜室進(jìn)行仿真分析。分析結(jié)果表明局部放電引起的電磁波以球面波的形式向四周傳播,由電磁波感應(yīng)生成的電場強度在柜門縫隙處最強,呈現(xiàn)出衰減振蕩的波形,同時檢測的感應(yīng)電壓與電場強度波形相似,考慮到實際傳感器的差異性,提出感應(yīng)電壓的歸一化處理,通過多點檢測有效地實現(xiàn)了局部放電的定位。
關(guān)鍵詞:開關(guān)柜;局部放電;時域有限差分法;歸一化;電磁波;感應(yīng)電壓
中圖分類號:TM591 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2019)12-0022-06
Analysis of Electromagnetic Characteristics of Partial Discharge in Switchgear
HUO Tian
(State Grid Beijing Electric Power Company Maintenance Branch, Beijing 100071, China)
Abstract: In order to study on the distribution of electromagnetic wave characteristics generated by partial discharge (PD) in the switchgear, based on the finite element difference theory, the three-dimensional full-wave electromagnetic simulation software XFDTD was used to simulate the most trouble-prone cable room. The analysis results show that the electromagnetic wave caused by PD is propagating in the form of spherical wave. The electric field intensity induced by electromagnetic wave is the strongest at the gap of the cabinet door, showing the waveform of damped oscillation. At the same time, the detected induced voltage is similar to the electric field intensity waveform. Considering the difference of the actual sensors, this paper proposes the normalization process of the induced voltage, effectively realizing the location of PD with multipoint detection.
Key words: switchgear; partial discharge; finite difference time domain method; normalization; electromagnetic wave; induced voltage
參考文獻(xiàn)
[1] 覃煜,范偉男,張行,等. 開關(guān)柜絕緣缺陷的局放帶電檢測及綜合診斷分析[J]. 高壓電器,2018,54(11):278-283.
[2] 王澤忠,李云偉,徐迪,等. 變電站開關(guān)瞬態(tài)電磁場數(shù)值計算方法[J]. 中國電機工程學(xué)報,2009,29(28):18-22.
[3] STONE G C, SEDDING H G, CHAN C.Experience with On-Line Partial Discharge Measurement in High Voltage Inverter Fed Motors[J].IEEE Transactions on Industry Applications,2018,54(1):866-872.
[4] 聶一雄,徐衛(wèi)東,周文文,等.12 kV固體絕緣開關(guān)柜中絕緣氣隙缺陷的放電特征[J]. 電工技術(shù)學(xué)報,2018,33(12):2894-2902.
[5] 舒勝文,鄭聞文,李功新,等. GIS局部放電UHF電磁波傳播特性的仿真分析及現(xiàn)場驗證[J]. 武漢大學(xué)學(xué)報( 工學(xué)版),2019,52(1):65-70.
[6] 姚陳果,黃琮鑒,吳彬,等. 采用時域有限差分法分析開關(guān)柜中超高頻信號傳播特性[J]. 高電壓技術(shù),2013,39(2):272-279.
[7] 張凱,陳麗安,黃留留. 基于有限元法的固體絕緣開關(guān)柜溫度場仿真研究[J]. 高壓電器,2018,54(12):76-81.
[8] 劉俊翔,莫文雄,欒樂,等. 一起基于在線監(jiān)測與聯(lián)合診斷的GIS局部放電缺陷分析[J]. 高壓電器,2017,53(12):247-252.
[9] 朱明曉,薛建議,邵先軍,等. GIS局部放電特高頻信號波形分析與特征參量提取[J]. 高電壓技術(shù),2017,43(12):4079-4087.
[10] 高鏘源,張建宏,鄭雪欽,等.110 kV盆式絕緣子法蘭金屬缺陷局部放電研究[J]. 高壓電器,2018,54(1):219-223.
[11] 張莎,宋建成,溫敏敏,等. 電力變壓器絕緣系統(tǒng)典型局部放電研究現(xiàn)狀與展望[J]. 變壓器,2018,55(4):32-40.
[12] 王有元,李寅偉,陸國俊,等. 開關(guān)柜局部放電暫態(tài)對地電壓傳播特性的仿真分析[J]. 高電壓技術(shù),2011,37(7):1683-1688.
[13] 紀(jì)鵬. 局部放電特高頻信號的傳播特性研究[J].現(xiàn)代工業(yè)經(jīng)濟和信息化,2017,7(16):11-13.
[14] 鄭瑩瑩,呂俊濤,黃銳,等. 高壓開關(guān)柜內(nèi)部缺陷的局部放電信號特征研究[J]. 山東電力技術(shù),2018,45(12):40-45.
[15] 黎宏飛,高宗寶,江建明,等. 開關(guān)柜典型缺陷模型的TEV和超聲波法局部放電特征研究[J]. 絕緣材料,2018,51(5):81-86.
[16] 李賓賓,張健,柯艷國,等. 基于暫態(tài)地電壓的開關(guān)柜局放特征提取及類型識別方法研究[J]. 高壓電器,2018,54(3):37-44.
[17] 蘇海博, 普美娜, 朱兆芳, 等. 基于Ansys仿真的開關(guān)柜局部放電研究[J]. 高壓電器,2017,53(2):159-165.