CAJ | 학술논문

有效识别超声直达波与混叠波信号是电气设备油中局放定位成功与否的关键。首先采用电-力-声类比原理建立局放超声信号的数学模型；接着对油中局放超声波传播时的折反射问题、衰减规律以及传播路径进行了理论分析，并对超声传感器接收到直达波与混叠波信号的时域波形进行建模；然后搭建实验平台，采集超声直达波与混叠波的实验波形，与仿真波形进行对比，多次实验结果表明，直达波与混叠波仿真波形与实验波形的相似度均为85%以上；最后采用相似度为85%的直达波实验波形与仿真波形进行局放定位，结果显示：采用实验波形进行定位，误差为8.3 cm，采用仿真波形进行定位，误差为5.2 cm，两者之间的定位误差相差较小，从而验证了该建模方法的正确性。
유효식별초성직체파여혼첩파신호시전기설비유중국방정위성공여부적관건。수선채용전-력-성류비원리건립국방초성신호적수학모형；접착대유중국방초성파전파시적절반사문제、쇠감규률이급전파로경진행료이론분석，병대초성전감기접수도직체파여혼첩파신호적시역파형진행건모；연후탑건실험평태，채집초성직체파여혼첩파적실험파형，여방진파형진행대비，다차실험결과표명，직체파여혼첩파방진파형여실험파형적상사도균위85%이상；최후채용상사도위85%적직체파실험파형여방진파형진행국방정위，결과현시：채용실험파형진행정위，오차위8.3 cm，채용방진파형진행정위，오차위5.2 cm，량자지간적정위오차상차교소，종이험증료해건모방법적정학성。
The effective identification of partial discharge (PD) ultrasonic direct wave and superimposed wave in oil is the key to positioning the PD source in the electrical equipment. In this paper, the modeling method on direct and superimposed ultrasonic wave of PD in oil was studied. First, the mathematical model of the PD ultrosonic signal was built using the electrical-force-sound principle; Second, the reflection and refraction law, the attenuation law and the propagation path of the PD ultrosonic signal in oil was studied, and the PD ultrosonic direct wave and superimposed wave were modeled after that;Third, the acutal waneforms of direct wave and superimposed wave were collected using the established experimental platform. Comparing with the simulating waveforms, the results of some experiments show that the similarity of the direct and superimposed waveforms between the actual and simulating waves are more than 85%. Finally, the PD source was located using the actual wave and the simulating wave of the direct wave whose similarity is 85%, the result shows that the error is 8.3 cm using the experimental waves, while the error is 5.2 cm using the simulating waves, the error between them is small, wnich proves the correctness of the modeling method proposed in this paper.