本文選題：油紙絕緣 + 老化�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：電力變壓器是保障電力系統(tǒng)安全穩(wěn)定運(yùn)行的關(guān)鍵設(shè)備,其內(nèi)部主要絕緣形式為油紙絕緣,其健康狀況直接關(guān)系到整個電網(wǎng)的運(yùn)行安全。局部放電是變壓器絕緣被破壞的主要原因之一,同時也是表征絕緣破壞程度的重要參考和表現(xiàn)形式,利用局部放電研究油紙絕緣變壓器內(nèi)部絕緣放電的發(fā)展過程,并對放電嚴(yán)重程度進(jìn)行狀態(tài)評估具有一定的現(xiàn)實意義。油紙絕緣在運(yùn)行過程會受到熱、電、環(huán)境、機(jī)械等因素的影響而發(fā)生絕緣老化,根據(jù)大量實際運(yùn)行故障可知,絕緣性能的劣化是導(dǎo)致電氣設(shè)備失效的主要原因。故此,本文針對不同老化程度油紙絕緣典型缺陷下局部放電的發(fā)展過程和特征進(jìn)行了研究。對絕緣紙板進(jìn)行加速熱老化處理,得到不同老化程度的紙板,等效模擬變壓器正常運(yùn)行不同年份的絕緣老化情況;搭建了絕緣紙板典型缺陷下局部放電實驗平臺,構(gòu)建了沿面放電和針板放電兩種典型的放電模型,對絕緣紙板進(jìn)行長時間局放試驗;通過局部放電巡檢儀采集數(shù)據(jù),得到紙板從局放開始到局放擊穿整個階段的最大放電量、放電重復(fù)率、平均放電量等參數(shù),結(jié)合統(tǒng)計參量和試驗現(xiàn)象將其整個階段分為三個階段,分別為放電起始、放電發(fā)展、放電危險階段;結(jié)合變壓器實際運(yùn)行情況,在考慮運(yùn)行溫度的影響,分析不同老化程度下油紙絕緣局部放電的發(fā)展規(guī)律。對四個不同溫度條件下不同老化程度紙板的發(fā)展過程進(jìn)行記錄,探究綜合溫度和老化兩種因素對局部放電發(fā)展的影響。結(jié)果表明:在起始階段,老化對放電發(fā)展影響不顯著;在放電發(fā)展和危險階段,隨著老化程度的增加,放電發(fā)展速度同樣增加,平均放電量、放電重復(fù)率、最大放電量等特征參數(shù)變大;在高溫下,老化對油紙絕緣局部放電發(fā)展的影響更為顯著,溫度越大,不同老化程度造成的放電特征量參數(shù)差異越大。
[Abstract]:Power transformer is the key equipment to ensure the safe and stable operation of power system. Its main insulation form is oil-paper insulation, and its health is directly related to the operation safety of the whole power network. Partial discharge (PD) is one of the main causes of transformer insulation failure, and is also an important reference and expression form to characterize the degree of insulation damage. The development process of internal insulation discharge of oil-paper insulation transformer is studied by partial discharge. It is of practical significance to evaluate the severity of discharge. Oil paper insulation will be affected by heat, electricity, environment, machinery and other factors during operation. According to a large number of actual operation failures, the deterioration of insulation performance is the main reason leading to the failure of electrical equipment. Therefore, the development process and characteristics of partial discharge (PD) under typical defects of oil-paper insulation with different aging degree are studied in this paper. Through accelerated thermal aging treatment of insulating paperboard, different degree of aging paperboard was obtained, equivalent simulation transformer normal operation of different years of insulation aging situation, build insulation board typical defects of partial discharge experimental platform, Two typical discharge models, surface discharge and needle board discharge, were constructed to carry out long time partial discharge test on insulating paperboard, and the maximum discharge amount from partial discharge to partial discharge breakdown was obtained by collecting data from partial discharge inspection instrument. The discharge repetition rate, average discharge quantity and other parameters, combined with statistical parameters and experimental phenomena, are divided into three stages, namely, discharge initiation, discharge development, discharge hazard stage, and actual operation of transformer. Considering the effect of operation temperature, the development law of partial discharge of oil-paper insulation under different aging degree is analyzed. The development process of paperboard with different aging degree under four different temperature conditions was recorded and the effects of comprehensive temperature and aging on PD development were investigated. The results show that the effect of aging on discharge development is not significant at the initial stage, and at the stage of discharge development and danger, the rate of discharge development increases with the increase of aging degree, and the average discharge quantity and discharge repetition rate increase. The influence of aging on the development of partial discharge of oil-paper insulation is more obvious at high temperature. The larger the temperature, the greater the difference of discharge characteristic parameter caused by different aging degree.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM855

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本文編號：1955891