【摘要】：變電站復(fù)雜的電磁干擾環(huán)境是造成當前局部放電在線檢測技術(shù)出現(xiàn)誤報漏報的重要原因,也是長期以來困擾局放在線檢測技術(shù)發(fā)展應(yīng)用的關(guān)鍵瓶頸。本文在分析了國內(nèi)外局放檢測抗干擾技術(shù)的基礎(chǔ)上,系統(tǒng)研究了變電站內(nèi)影響局部放電檢測的電磁干擾信號的特征、來源及影響因素,提出了干擾模擬和分級的方法,建立了針對局部放電檢測設(shè)備抗電磁干擾性能檢驗和評價的標準化測試方案。主要內(nèi)容如下:選取了代表性的變電站和測試點,采用UHF和高頻電流檢測手段通過現(xiàn)場實測的方式研究了典型電磁干擾信號的特征以及來源,并采用TEV法對開關(guān)柜作了相應(yīng)測試。研究發(fā)現(xiàn):移動通訊和變電站設(shè)備外部的放電是局放UHF檢測最主要的電磁干擾形式,原始信號幅值最大至200mV以上,頻帶均在UHF檢測內(nèi);高頻檢測干擾信號的幅值在5.8~501mV范圍內(nèi),頻譜一般分布在90MHz以下;50%以上變電站的開關(guān)柜存在脈沖信號。通過數(shù)據(jù)關(guān)聯(lián)分析的方法,研究了電磁干擾信號的動態(tài)變化與氣象條件(溫度、濕度)、負荷狀況之間的關(guān)聯(lián)關(guān)系,采用對比的方式研究了地理位置、電壓等級對電磁干擾動態(tài)變化的影響。結(jié)果表明,變電站電磁干擾信號受溫度因素影響最大,尤其是放電類干擾,特征關(guān)聯(lián)度均值在0.9以上,濕度次之,負荷最小;地理位置和電壓等級會間接影響電磁干擾信號的類型、幅值以及信號發(fā)生的概率。借鑒EMC標準分級方法,結(jié)合局放監(jiān)測裝置的工作特點和易受影響的程度,根據(jù)電磁干擾信號的來源、類型、強度、發(fā)生頻度等指標,提出了典型電磁干擾模擬和分級的方法以及局放監(jiān)測裝置標準化的干擾測試平臺搭建的方案,并給出了相應(yīng)的評價指標。
[Abstract]:The complex electromagnetic interference (EMI) environment in substations is an important reason for the misinformation and underreporting of the current PD on-line detection technology, and it is also the key bottleneck of the development and application of the on-line detection technology for a long time. Based on the analysis of anti-jamming technology of PD detection at home and abroad, this paper systematically studies the characteristics, sources and influencing factors of electromagnetic interference signals affecting PD detection in substations, and puts forward the methods of jamming simulation and classification. A standardized test scheme for testing and evaluating the performance of PD detection equipment against electromagnetic interference is established. The main contents are as follows: the typical substation and test points are selected, and the characteristics and sources of typical electromagnetic interference signals are studied by means of UHF and high frequency current detection. The TEV method is used to test the switchgear. It is found that the external discharge of mobile communication and substation equipment is the most important form of electromagnetic interference in PD UHF detection. The original signal amplitude is larger than 200mV and the frequency band is within UHF detection. The amplitude of the high frequency detection interference signal is in the range of 5.8~501mV, the frequency spectrum is generally distributed below 90MHz, and the pulse signal exists in the switchgear of more than 50% substation. By means of data correlation analysis, the relationship between the dynamic change of EMI signal and meteorological conditions (temperature, humidity) and load condition is studied. The influence of voltage level on the dynamic change of electromagnetic interference. The results show that the electromagnetic interference signal of substation is most affected by temperature factors, especially the discharge type interference, the average of characteristic correlation degree is more than 0.9, the humidity is the second, and the load is the least. Geographical location and voltage level indirectly affect the type, amplitude and probability of EMI signal. Based on the standard classification method of EMC, combined with the working characteristics and vulnerable degree of PD monitoring device, according to the source, type, intensity and frequency of electromagnetic interference signal, The methods of simulation and classification of typical electromagnetic interference and the scheme of setting up a standardized interference test platform for PD monitoring device are put forward, and the corresponding evaluation indexes are given.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM63;TM855

【參考文獻】

相關(guān)期刊論文 前10條

1 王永強;李建芳;李長元;鄭志宏;崔博源;;檢測GIS局部放電的小型化平面螺旋天線研究[J];高電壓技術(shù);2016年04期

2 王鵬皓;閆杰;王天正;;紫外成像法的GIS盆式絕緣子局部放電研究[J];高壓電器;2015年09期

3 李軍浩;韓旭濤;劉澤輝;李彥明;;電氣設(shè)備局部放電檢測技術(shù)述評[J];高電壓技術(shù);2015年08期

4 汪可;廖瑞金;王季宇;楊麗君;李劍;;局部放電UHF脈沖的時頻特征提取與聚類分析[J];電工技術(shù)學(xué)報;2015年02期

5 耿建平;方慧;韋U，

本文編號：2420140