摘要
基于介质响应理论的回复电压测量方法能够有效地无损诊断变压器的绝缘状态,评估变压器绝缘纸中的水分含量。其中回复电压初始斜率特征量与热老化有着密切的关系,因此它也是评估绝缘老化的重要特征量。本文阐述了回复电压初始斜率在辨识介质响应等值电路参数方面具有重要的作用,并建立了利用回复电压初始斜率特征量求解介质响应等值电路参数的数学模型,该模型为含有指数函数的非线性方程组。本文利用最小二乘方法建立了数学优化模型,并应用智能优化算法求解。研究结果表明本文建立的模型是可行的,为评估变压器老化和研究新的特征量提供了新思路。
return voltage measurement(RVM) based on dielectric response testing techniques is being investigated as potential tools for condition assessment of transformer insulation.It is a simple,fast and nondestructive method to monitor insulation status of transformer and estimate the moisture content of paper insulation.The initial slope of return voltage has close relation with thermal aging of transformer.It is an important characteristic parameter to as-sess insulation aging and is also of great significance to identify the parameters of dielectric response equivalent cir-cuit.This paper establishes a mathematical model with the data of initial slope of return voltage for solving parame-ter of dielectric response equivalent circuit,which is a group of nonlinear equations with exponential function.The problem to be solved for nonlinear equations is transformed to the constrained optimization problem using nonlinear least square method,and then the particle swarm optimization algorithm is used for solving the problem.The result shows that the established model is feasible and effective.It provides a new idea for assessment of insulation aging and research on new characteristic parameters.
出处
《电工电能新技术》
CSCD
北大核心
2010年第4期35-39,共5页
Advanced Technology of Electrical Engineering and Energy
关键词
回复电压
初始斜率
参数辨识
介质响应
绝缘纸
变压器
return voltage
initial slope
parameters identification
dielectric response
insulation paper
trans-former