基于COMSOL的变压器中超声波传播特性
发布时间：2018-08-04 09:26
【摘要】：通过建立变压器仿真模型,分别研究了在局部放电源固定的情况下,声压在空间中的传播规律及其幅值变化情况、放电源位置对信号传播特性的影响及声波在铁心、绕组和变压器油中传播时的衰减规律。仿真结果表明,局部放电声爆炸发生后的1ms内,变压器内部声压的空间分布迅速发生变化,但是1ms之后无明显变化;变压器铁心和绕组中声压的变化幅度比油中更大,局部放电声爆炸以球面波形式的波阵面向周围介质传播;观察点离局部放电源位置越近,接受到的信号幅值越大;声波在铁心、绕组和变压器油中传播时,声压幅值在三个方向上因传播路径的差异随传播距离的增加经历不同的衰减。通过试验验证了仿真结果的正确性。该分析可以为变压器中超声波局部放电检测提供依据。
[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.
【作者单位】： 武汉大学电气工程学院;国网北京电科院;国家电网公司西南分部;
【分类号】：TM855
[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.
【作者单位】： 武汉大学电气工程学院;国网北京电科院;国家电网公司西南分部;
【分类号】：TM855
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