水轮发电机碳刷/集电环界面间隙放电试验研究  

Experimental Study on Gap Discharge Between Carbon Brush/Slip Ring Interface of Hydro-generator

作　　者：赵新泽 陈明 聂云锋 李雪强 肖水淋 徐翔 ZHAO Xin-ze;CHEN Ming;NIE Yun-feng;LI Xue-qiang;XIAO Shui-lin;XU Xiang(College of Mechanical and Power Engineering,China Three Gorges University,Yichang 443002,China;Hubei Key Laboratory of Hydroelectric Machinery Design&Maintenance,China Three Gorges University,Yichang 443002,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]三峡大学机械与动力学院,湖北宜昌443002 [2]三峡大学水电机械设备设计与维护湖北省重点实验室,湖北宜昌443002 [3]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《水电能源科学》2022年第12期169-172,共4页Water Resources and Power

基　　金：中科院兰州化学物理研究所固体润滑国家重点实验室开放基金项目(LSL-1909)。

摘　　要：水轮发电机集电环运行过程中出现的偏心摆振会使碳刷/集电环界面接触时产生瞬时间隙,这会导致界面放电出现碳刷打火烧蚀的现象。通过多组界面间隙放电试验,以高速相机拍摄电火花貌,利用python对图片提取电火花面积取平均值表征放电相对强度。结果表明,界面放电相对强度随间隙的变化先增后减,呈偏正态分布;放电特点与极性相关,碳刷接负极放电位置偏离中心呈球/椭球状,强度较大;碳刷接正极放电位于中心部位呈柱状,强度较小。The eccentric vibration during the operation of the collector ring of the hydro-generator will cause an instantaneous gap when the carbon brush/collector ring interface is in contact.Through multiple groups of interface gap discharge tests,high-speed camera was used to capture the appearance of the electric spark,and python was used to extract the area of the electric spark from the picture and take the average value to characterize the relative intensity of the discharge.It is found that the relative intensity of interfacial discharge increases first and then decreases with the change of the gap,showing a skewed normal distribution.The discharge characteristics are related to the polarity.The discharge position of the carbon brush connected to the negative electrode deviates from the center and is spherical/ellipsoidal,with high intensity;The carbon brush connected to the positive electrode is located in the center and is columnar,with low intensity.

关 键 词：碳刷/集电环 打火烧蚀 间隙放电 图片处理 

分 类 号：TV738[水利工程—水利水电工程]