本文關(guān)鍵詞： 變壓器 油紙絕緣 局部放電 加速電劣化 碳化通道 白斑　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：變壓器油紙絕緣局部放電大致可劃分為三類：紙板／紙沿面爬電、紙板／紙內(nèi)部放電、油中電暈放電。其中以紙板沿面爬電危害最大,紙板／紙內(nèi)部放電次之,油中電暈放電的危害相對(duì)較小,本文重點(diǎn)研究前兩種類型放電。 為了研究變壓器油紙絕緣材料內(nèi)部局部放電劣化缺陷的發(fā)展規(guī)律及其與局部放電特征量的關(guān)聯(lián)性,構(gòu)建了匝間局部放電模型,進(jìn)行了多組不同加壓時(shí)間段的恒壓試驗(yàn),并記錄了試驗(yàn)過(guò)程中的局部放電信號(hào)。利用匝間絕緣紙帶可層層拆解的結(jié)構(gòu)特點(diǎn),獲得了匝間絕緣在加速電劣化下碳化通道發(fā)展的統(tǒng)計(jì)性規(guī)律。研究結(jié)果表明,恒壓加速電劣化作用下匝間油紙絕緣局部放電缺陷即碳化通道沿宏觀電場(chǎng)的縱向發(fā)展過(guò)程呈現(xiàn)增長(zhǎng)、停滯和擊穿三個(gè)基本階段；脈沖重復(fù)率和脈沖1秒鐘內(nèi)總放電量可以宏觀表征匝間油紙絕緣電劣化缺陷的發(fā)展?fàn)顩r,為油紙絕緣局部放電嚴(yán)重程度階段性的準(zhǔn)確劃分提供參考依據(jù)。 爬電放電被認(rèn)為是變壓器內(nèi)部危害性最大的絕緣故障類型,往往在正常的運(yùn)行條件下就可造成災(zāi)難性的事故�，F(xiàn)有的試驗(yàn)研究成果均未涉及爬電過(guò)程中絕緣缺陷與局部放電信號(hào)特征量之間的關(guān)聯(lián)性問(wèn)題。本文采用針板試驗(yàn)?zāi)Ｐ?研究了油浸紙板層間爬電的試驗(yàn)現(xiàn)象,定量地描述了爬電絕緣缺陷即白斑的發(fā)展規(guī)律。分析結(jié)果表明：利用白斑起始前后脈沖相位分布譜圖的形狀輪廓及統(tǒng)計(jì)特征參數(shù)的階躍突變特點(diǎn),可以獲得白斑起始的先兆表征；脈沖重復(fù)率和脈沖1秒鐘放電量這兩個(gè)局部放電特征量均可表征樹(shù)枝狀白斑的發(fā)展過(guò)程。
[Abstract]:Transformer oil-paper insulation partial discharge can be divided into three categories: paperboard / paper side creeping, paperboard / paper internal discharge, corona discharge in oil. The damage of corona discharge in oil is relatively small. This paper focuses on the first two types of discharge. In order to study the development rule of partial discharge deterioration defect in oil-paper insulation material of transformer and its relation with partial discharge characteristic quantity, the inter-turn partial discharge model was constructed, and the constant voltage test was carried out for many groups of different pressure periods. The partial discharge signals during the test are recorded. The statistical law of the carbonization channel development of inter-turn insulation under accelerated electric degradation is obtained by using the structure characteristics of interturn insulator paper tape which can be disassembled layer by layer. The defect of partial discharge of inter-turn oil-paper insulation under constant voltage accelerated electric deterioration is that the carbonization channel increases along the longitudinal development process of macroscopic electric field, which is the three basic stages of stagnation and breakdown. The pulse repetition rate and the total discharge in one second can be used to characterize the development of the electric deterioration defect of inter-turn oil-paper insulation, which provides a reference for the accurate division of the severity of partial discharge in oil-paper insulation. Creeping discharge is considered to be the most harmful type of insulation fault in transformers. Catastrophic accidents are often caused under normal operating conditions. The existing experimental results do not deal with the relationship between insulation defects and partial discharge signal characteristics during creeping. In this paper, a needle-board test model is used. The experimental phenomenon of interlayer creeping of oil-impregnated paperboard was studied. The development law of white spot, which is the defect of creeping insulation, is described quantitatively. The results show that the shape profile of pulse phase distribution spectrum before and after the initiation of white spot and the step mutation characteristics of statistical characteristic parameters are used. The characteristics of pulse repetition rate and pulse discharge in one second can be used to characterize the development of dendritic white spot.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM855

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