基于改进SDG的电力变压器套管发热故障检测方法  

Fault Detection Method for Casing Heating in Power Transformer Based on Improved SDG

作　　者：吕刚 邓军 石玉秉 罗宗源 张瑞亮 LÜGang;DENG Jun;SHI Yubing;LUO Zongyuan;ZHANG Ruiliang(China Southern Power Grid Co.,Ltd.,Guiyang Bureau of UHV Transmission Company,Guiyang 550000,China;Nanjing Electric High Voltage Bushing Co.,Ltd.,Nanjing 210038,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司贵阳局,贵州贵阳550000 [2]南京电气高压套管有限公司,江苏南京210038

出　　处：《微型电脑应用》2024年第11期53-56,共4页Microcomputer Applications

基　　金：南方电网超高压输电公司科研项目资助(CSPGKJ2010001)。

摘　　要：为了解决电力变压器套管发热的问题,提出基于改进符号有向图(SDG)的电力变压器套管发热故障检测方法。根据SDG的定向特性变化规律,对各待检测节点赋予同一阈值,以有向符号表达其变量的变化情况;以定向的模型为基础,分为单故障和多故障检测,单故障通过模拟注入故障构建直观的故障树模型,多故障则是通过对同一节点给予不同隶属度的方式。由此对区域实现有效区分,再将各区域的故障对比率引入隶属度的函数公式,计算取值变化范围,实现多故障检测。仿真实验证明,该方法进行电力变压器套管发热故障检测的效果较好。In order to solve the problem of power transformer casing heating,a power transformer casing heating fault detection method based on improved signed dinected graph(SDG)is proposed.According to the change rule of directional characteristics of SDG,each node to be detected is given the same threshold variable,and the change of its variable is expressed in the form of directional symbols.Based on the directional model,it is divided into single fault and multiple faults detection.A single fault is injected into the fault through simulation to build an intuitive fault tree model,and multiple faults are given different membership degrees to the same node.The regions are effectively distinguished,and then the fault contrast ratio of each region is introduced into the function formula of membership degree to calculate the value change range and realize multiple faults detection.Simulation results show that this method is more effective in detecting the heating fault of power transformer casing.

关 键 词：电力变压器 改进SDG 定向特性 阈值变量 隶属度 

分 类 号：TP206.5[自动化与计算机技术—检测技术与自动化装置]