文章摘要
热机联合应力对油浸纸板绝缘及机械特性影响研究
Study on the influence of thermo-mechanical combined stress on insulation and mechanical characteristics of oil-impregnated paperboard.
投稿时间:2020-01-14  修订日期:2020-03-23
DOI:
中文关键词: 关键词:油纸绝缘  热老化  热机联合应力  局部放电
英文关键词: Keywords: oil-paper insulation  thermal aging  thermo-mechanical combined stress  partial discharge
基金项目:国家自然科学基金“智能电网联合基金”集成项目(U1866603)
作者单位E-mail
刘志华 西安交通大学电力设备电气绝缘国家重点实验室 lzh2536@stu.xjtu.edu.cn 
崔彦捷 西安交通大学电力设备电气绝缘国家重点实验室  
汲胜昌 西安交通大学电力设备电气绝缘国家重点实验室 jsc@xjtu.edu.cn 
祝令瑜 西安交通大学电力设备电气绝缘国家重点实验室  
摘要点击次数: 155
全文下载次数: 104
中文摘要:
      油纸绝缘系统在热、机械等应力共同作用下所发生的绝缘老化与破坏是电力变压器发生故障的主要原因之一。本文对热机联合应力对油纸绝缘的影响开展了实验研究。对油浸纸板进行不同时间的热老化后施加不同形式的机械应力,测量纸板产生的应变,分析了不同条件对油浸纸板的耐压时间、局部放电相位分布(Phase resolved partial discharge, PRPD)谱图、平均放电量等局放特征的影响。对未经老化的油浸纸板,机械应力加载时间越长、应力幅值越高或者应力频率越低,油浸纸板受到的破坏作用越严重,机械性能和绝缘性能越差。油浸纸板经过热老化处理后,机械应力对其绝缘性能和机械性能的影响趋势与未老化时类似,但热老化后PRPD谱图形态多呈现“兔耳状”。随着热老化时间的增加,纸板的绝缘寿命先有所上升,然后一直下降。本文的研究结果可为热机联合应力下油浸纸板老化模型建立提供试验依据。
英文摘要:
      The main cause of transformer fault is insulation aging and damage caused by internal oil-paper insulation sys-tem under thermal and mechanical stress. In this paper, the effect of thermo-mechanical combined stress on oil paper insulation is studied. Oil-impregnated paperboard is subjected to thermal aging at different times and dif-ferent forms of mechanical stress are applied, and the strain generated by the paperboard under stress is meas-ured. The effects of different loading conditions on the characteristics of withstand time, phase resolved partial discharge (PRPD) spectrum, average discharge capacity and other partial discharge characteristics were analyzed. The longer the stress loading time, the higher the stress amplitude or the lower the stress frequency, the more se-vere the damage of the oil-impregnated paperboard under the same mechanical stress, and the worse the me-chanical insulation and mechanical properties of the paperboard. Under the action of thermo-mechanical accu-mulation, the effect of different mechanical stress is similar to that of unaged, but the morphology of PRPD spec-tra after thermal aging is mostly “rabbit-like”. With the increase of thermal aging time, the insulation life of pa-perboard first increased, then decreased. The results of this study will provide a reference for establishing an ag-ing model of oil-impregnated paperboard under thermo-mechanical combined stress.
查看全文   查看/发表评论  下载PDF阅读器
关闭