【摘要】：變壓器是電力系統(tǒng)最重要的設(shè)備之一,其可靠性直接影響電網(wǎng)的安全運(yùn)行。對其絕緣性能進(jìn)行局部放電在線檢測,能夠連續(xù)、實(shí)時的反映出變壓器內(nèi)部的絕緣劣化狀況,是掌握變壓器絕緣狀況的重要手段之一。寬頻帶脈沖電流法檢測法與常規(guī)脈沖電流法相比具有測量頻帶寬、靈敏度高、包含的局部放電信息量大等優(yōu)點(diǎn),可以更加真實(shí)地反映局部放電的原始脈沖電流特征,為采用脈沖電流波形分析的方法進(jìn)行信號與噪聲分離提供了可能,因此本文對其進(jìn)行了研究。 本文研制了一套能在變電站環(huán)境下使用的寬頻帶局部放電在線檢測系統(tǒng),包括寬頻帶電流傳感器、工頻相位發(fā)生器、寬頻帶信號放大器、濾波器、數(shù)字示波器和計(jì)算機(jī)。在3臺三相雙繞組真實(shí)變壓器和1臺三相三繞組模型上研究了寬頻帶局部放電脈沖在實(shí)際變壓器中的傳播規(guī)律和耦合機(jī)理,可為變壓器局部放電在線監(jiān)測和定位提供指導(dǎo)。 本文利用所設(shè)計(jì)的寬頻帶局部放電在線檢測系統(tǒng)采集了某地多個變電站內(nèi)變壓器鐵芯接地線上的局部放電信號,并將每個變電站的信號進(jìn)行了頻譜分析,從頻域內(nèi)研究寬頻帶局部放電的規(guī)律；然后進(jìn)行了基于相位分布的統(tǒng)計(jì)分析,并將有疑似放電的數(shù)據(jù)進(jìn)行了基于等效時頻法的放電類型的識別。
[Abstract]:Transformer is one of the most important equipments in power system. Its reliability directly affects the safe operation of power grid. On-line partial discharge (PD) detection of its insulation performance can reflect the internal insulation deterioration of the transformer continuously and in real time. It is one of the important means to master the insulation condition of the transformer. Compared with the conventional pulse current method, the broadband pulse current detection method has the advantages of high frequency bandwidth, high sensitivity and large amount of partial discharge information, which can more truly reflect the original pulse current characteristics of partial discharge. It is possible to separate the signal from noise by using the method of pulse current waveform analysis, so it is studied in this paper. In this paper, a broadband PD on-line detection system is developed, which can be used in substation environment, including broadband current sensor, power frequency phase generator, broadband signal amplifier, filter, digital oscilloscope and computer. The propagation law and coupling mechanism of wide-band partial discharge pulse in practical transformer are studied on three real three-phase double-winding transformers and one three-phase three-winding model, which can provide guidance for on-line monitoring and location of partial discharge of transformers. In this paper, the partial discharge signals on the core earth wires of transformers in several substations are collected by using the designed broadband PD on-line detection system, and the frequency spectrum of the signals in each substation is analyzed. The law of wide-band partial discharge is studied from the frequency domain. Then the statistical analysis based on phase distribution is carried out, and the data of suspected discharge are identified based on equivalent time-frequency method.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM855

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