摘要
在换流变压器现场交接或诊断性试验中,局部放电检测是用来判断内部绝缘结构是否完好的关键试验之一,但其易受周期性窄带干扰。本文建立了换流变压器阀侧绕组的分布参数仿真模型,提出了基于单体平衡法的局部放电检测方法,通过周期性窄带干扰信号、局部放电信号及其混合信号的仿真计算,验证了其能够准确检测局部放电信号,且对噪声干扰具有良好的抑制效果。基于此方法,本文开展了局部放电信号的传播仿真计算,通过改变施加在绕组上局部放电脉冲信号的位置,得到了不同位置信号的传播波形,分析了局部放电电源放置位置变化对输出波形特性的影响规律。计算结果表明本文提出的单体平衡法具有抗干扰能力强、局部放电脉冲信号检测准确的特点,为工程应用提供了更加丰富的理论依据。
During the on-site commissioning or diagnostic tests of rectifier transformers,the detection of partial discharges is a crucial examination for assessing the integrity of the internal insulation structure.However,this detection is susceptible to periodic narrowband interference.This study establishes a simulation model with distributed parameters for the valve-side winding of the rectifier transformer,concurrently introducing a novel method for detecting partial discharges based on the monomer balance method.The simulation results of periodic narrowband interference,partial discharge and its mixture signal show that it can detect the partial discharge signal accurately and suppress the noise interference effectively.In accordance with this methodology,this paper conducted simulation calculations of the propagation of partial discharge signals.By changing the position of the applied partial discharge pulse signal on the winding,the paper analyzed the impact of positions on the characteristics of the output waveform.The computational results indicate that the monomer balance method proposed in this paper exhibits robust resistance to interference and accurate detection of partial discharge pulse signals,providing a more comprehensive theoretical basis for engineering applications.
作者
刘强
江天炎
毛辰
尚宇
王子为
LIU Qiang;JIANG Tianyan;MAO Chen;SHANG Yu;WANG Ziwei(State Grid Shaanxi Electric Power Co.,Ltd.Electric Power Research Institute,Xi’an 710100,China;School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《电工电能新技术》
CSCD
北大核心
2024年第8期10-17,共8页
Advanced Technology of Electrical Engineering and Energy
基金
国网陕西省电力有限公司科技项目(5226KY23000Z)
国家自然科学基金项目(52177129)。
关键词
换流变压器
单体平衡法
局部放电
传播特性
converter transformer
monomer balance method
partial discharge
propagation characteristics
