【摘要】：通過建立變壓器仿真模型,分別研究了在局部放電源固定的情況下,聲壓在空間中的傳播規(guī)律及其幅值變化情況、放電源位置對信號傳播特性的影響及聲波在鐵心、繞組和變壓器油中傳播時的衰減規(guī)律。仿真結(jié)果表明,局部放電聲爆炸發(fā)生后的1ms內(nèi),變壓器內(nèi)部聲壓的空間分布迅速發(fā)生變化,但是1ms之后無明顯變化;變壓器鐵心和繞組中聲壓的變化幅度比油中更大,局部放電聲爆炸以球面波形式的波陣面向周圍介質(zhì)傳播;觀察點離局部放電源位置越近,接受到的信號幅值越大;聲波在鐵心、繞組和變壓器油中傳播時,聲壓幅值在三個方向上因傳播路徑的差異隨傳播距離的增加經(jīng)歷不同的衰減。通過試驗驗證了仿真結(jié)果的正確性。該分析可以為變壓器中超聲波局部放電檢測提供依據(jù)。
[Abstract]:Through the establishment of a transformer simulation model, the propagation law of sound pressure in the space and the variation of the amplitude in the space, the influence of the position of the power source on the propagation characteristics of the signal and the attenuation law of the sound wave propagation in the core, winding and transformer oil are studied respectively. After the occurrence of 1ms, the spatial distribution of sound pressure inside the transformer changes rapidly, but there is no obvious change after the 1ms; the change amplitude of the sound pressure in the transformer core and the winding is larger than that in the oil, and the local discharge of the acoustic explosion is spread to the surrounding medium in the form of spherical wave; the closer the location of the observation point is to the local discharge power, the letter accepted The greater the amplitude of the signal, the sound pressure amplitude in the core, winding and transformer oil is transmitted in three directions. The difference of the propagation path varies with the propagation distance in different directions. The correctness of the simulation results is verified by the experiment. The analysis can provide the basis for the partial discharge detection of ultrasonic wave in the transformer.
【作者單位】： 武漢大學(xué)電氣工程學(xué)院;國網(wǎng)北京電科院;國家電網(wǎng)公司西南分部;
【分類號】：TM855

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本文編號：2163397