摘要
特高频(UHF)技术通过检测局部放电辐射电磁波信号来实现对设备局部放电的检测,抗干扰能力强,检测灵敏度高,是一种基于空间电磁场耦合的局部放电测试技术,能够实现真正意义上的局部放电在线检测,因此在变压器局部放电检测领域取得了日益广泛的关注及研究。由于变压器内部结构复杂,各种金属结构件都会对辐射电磁波的传播产生影响,因此变压器局部放电UHF检测技术有必要研究变压器内部电磁波的传播规律。为此在对变压器内部结构进行合理简化的基础上完成了变压器典型结构的计算机建模,以高斯电流元模拟局部放电源,合理设置各类仿真参数,利用时域有限差分法(FDTD)对特高频电磁波在变压器内部的传播特性进行了仿真分析。仿真结果给出辐射电磁波信号在铁心绕组之间的传播特点,铁心对电磁波传播造成的衰减和畸变作用,并通过时域及频域波形的对比给出不同脉宽、不同幅值电磁波信号在铁心绕组结构中传播的特点。
Ultra-high-frequency （UHF） technique, by achieve the equipment partial discharge detection, has detecting partial discharge electromagnetic radiation signals to perfect anti-interference ability and high detection sensitivity, and it is necessary to study the propagation characteristics of electromagnetic waves inside the transformers when researching transformers discharge {PD） UHF detection method. In this paper, a computer model of the transformers internal structures was built up based on a reasonable simplification of the transformer body. A PD source was simulated by Gauss-current element, various simulation parameters were reasonably set, and then, the UHF electromagnetic waves propagation in transformers was slmulated and studied using Finite Difference Time Domain {FDTD） method. The simulation results explain the propagation characteristics of electromagnetic radiation signals between the windings and the core, the electromagnetic waves propagation attenuation and distortion caused by the core, and the propagation of the different widths and different amplitudes of the electromagnetic waveforms in the windings and the core structure based on contrast analysis of the time-domain and freauencv-domain waveforms
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第7期1629-1634,共6页
High Voltage Engineering
基金
创新团队发展计划(IRT0515)
北京市教委科学研究与科研基地建设项目~~
