高压电器2025，Vol.61Issue(1)：54-62,71,10.DOI:10.13296/j.1001-1609.hva.2025.01.006
基于Savitzky-Golay滤波器的有载分接开关振动信号包络线提取方法研究
Study on Envelope Extraction Method of Vibration Signal of OLTC Based on Savitzky-Golay Filter
摘要
Abstract
During the switching process of the on load tap changers(OLTC),each contact collides in sequence in closing and opening operation and generates vibration signal.The signal's characteristics reflects the collision ener-gy and stiffness of the contacts.In order to study the dynamic characteristic of the contact collision,the collision dy-namic model with 4 contacts of M-type OLTC is set up firstly,and the influence of static contact stiffness on the re-sponse characteristic of the model is calculated.Then,the spring relaxation fault of the stationary contact is simulat-ed and the corresponding vibration signal of spring with wire diameter of 0.6 mm and 1.0 mm are obtained.After that,the envelope calculation method based on Savitzky-Golay filter is proposed to extract the average envelope of vi-bration signal during the odd position to the even position and the opposite.Finally,the correlation coefficients of the average envelope corresponding to the static spring of the two wire diameters are calculated.The study results show that the natural frequency of the contact collision system decreases with the decreasing stiffness of stationary contact,consequently leads to a slower response speed of the contact collision and the time delay of the first peak of the vibra-tion signals.Furthermore,the correlation coefficient of the average envelopes is only 1.6,indicating a significant vari-ation of the vibration signal caused by the change of stiffness of the contact.The study conclusion can be used in the diagnosis of the contact condition of the OLTC.关键词
有载分接开关/触头碰撞/动力学模型/响应特性Key words
on-load tap changer/contact collision/dynamic model/vibration response引用本文复制引用
王丽丽,高树国,刘宏亮,赵军,邢超,孙路,相晨萌..基于Savitzky-Golay滤波器的有载分接开关振动信号包络线提取方法研究[J].高压电器,2025,61(1):54-62,71,10.基金项目
国网河北省电力有限公司电力科学研究科技项目(SGHEDK00DYJS2000251). Project Supported by Science and Technology Foundation of Hebei Electric Research Institue,Electric Power Company,Stare Grid Corporation of China(SGHEDK00DYJS2000251). （SGHEDK00DYJS2000251）
