油紙絕緣介質損耗與局部放電關聯(lián)特性研究
發(fā)布時間：2018-10-24 20:23
【摘要】：介質損耗及局部放電是衡量油紙絕緣絕緣性能的重要指標,研究油紙絕緣介損與局放關聯(lián)特性對提高基于介損及局放的油紙絕緣狀態(tài)監(jiān)測及診斷水平,實現(xiàn)基于多元信息融合的油紙絕緣狀態(tài)評估,具有重要意義。本文搭建了油紙絕緣介損、局放測量實驗平臺,實現(xiàn)了介損值及局放統(tǒng)計參量精確計算,分析了局放發(fā)展過程中介損值、介損值增量及局放統(tǒng)計參量變化特性,研究了油紙絕緣介損值、介損值增量與局放統(tǒng)計參量的關聯(lián)特性。設計了油紙絕緣沿面放電缺陷模型,得到了絕緣紙板含水率不同的油紙絕緣試品;搭建了油紙絕緣介損及局放測量實驗平臺,滿足了介損測量用信號及局放信號采集需求;提出了一種基于迭代匹配追蹤的介損角計算方法,仿真結果表明,該方法可實現(xiàn)介損值精確、穩(wěn)定計算�；谏龎悍▽嶒�,得到各試品介損及局放統(tǒng)計參量變化規(guī)律。結果表明:對于局部放電,隨著電壓升高,總放電量、最大放電量、平均放電量逐漸增大;總放電次數、平均放電脈沖長度先增大后振蕩下降;各譜圖偏斜度,Hn(q)譜圖峭度、Weibull分布?系數規(guī)律性較強;絕緣紙板含水率對總放電量、最大放電量、平均放電量、?系數影響較大,同一電壓,絕緣紙板含水率越高,上述參量數值越大、增長越快。對于介損,隨著電壓升高,各試品介損值增量先升高后穩(wěn)定或后下降、各試品介損值逐漸增大,但電壓較高時介損值上升速率明顯放慢,且有飽和趨勢,絕緣紙板含水試品介損值甚至出現(xiàn)下降趨勢。構建了含局部缺陷的絕緣介質介損變化數學模型,解釋了局放影響下各試品介損值變化規(guī)律。分析了介損值與局放統(tǒng)計參量的關聯(lián)關系,研究了介損值增量與局放50Hz基波分量的關聯(lián)特性。結果表明,隨著局放發(fā)展,介損值變化規(guī)律受局部缺陷處介損值增大及局部缺陷范圍擴大影響;介損值與局放總放電量,總放電次數,平均放電量,最大放電量,平均放電脈沖長度,Hn(q)譜圖偏斜度、陡峭度及Weibull分布?系數關聯(lián)性較強,但并非單調線性相關,且受絕緣紙板含水率影響,難以建立介損值與單一局放統(tǒng)計參量間簡單關聯(lián)關系。局放信號50Hz基波分量對介損值增量有重要影響,兩者基本單調相關,且局放50Hz基波分量受平均放電量、總放電次數及放電脈沖持續(xù)時間影響,在上述統(tǒng)計參量共同作用下,各試品介損值增量呈特定變化規(guī)律。
[Abstract]:Dielectric loss and partial discharge are important indexes to measure the insulation performance of oil-paper. The correlation between dielectric loss and partial discharge of oil-paper insulation is studied to improve the monitoring and diagnosis level of oil-paper insulation based on dielectric loss and partial discharge. It is of great significance to realize the evaluation of oil-paper insulation based on multiple information fusion. In this paper, an experimental platform for oil paper insulation dielectric loss and partial discharge measurement is set up. The accurate calculation of dielectric loss and partial discharge statistical parameters is realized. The variation characteristics of intermediate loss value, dielectric loss increment and partial discharge statistical parameters during partial discharge development are analyzed. The correlation characteristics of dielectric loss value, dielectric loss increment and partial discharge statistical parameters of oil-paper insulation are studied. The defect model of oil-paper insulation along the surface discharge is designed, and the oil-paper insulation test material with different moisture content is obtained, and the experimental platform of oil-paper insulation dielectric loss and partial discharge measurement is built to meet the needs of signal acquisition for dielectric loss measurement and partial discharge signal. A method for calculating dielectric loss angle based on iterative matching tracing is proposed. The simulation results show that the method can calculate the dielectric loss accurately and stably. Based on the booster test, the variation of dielectric loss and partial discharge statistical parameters of each sample is obtained. The results show that for partial discharge, the total discharge, the maximum discharge and the average discharge increase with the increase of voltage, and the total discharge times and the average discharge pulse length increase first, and then the oscillation decreases. , Hn (q) spectral kurtosis, Weibull distribution? The coefficient is regular, the moisture content of insulating paperboard has great effect on the total discharge, maximum discharge, average discharge,? The same voltage, the higher the moisture content of insulating paperboard, the greater the value of the above parameters and the faster the growth. For dielectric loss, with the increase of voltage, the increment of dielectric loss increased first and then stabilized or decreased. The dielectric loss value of each sample gradually increased, but the increasing rate of dielectric loss value slowed down obviously when the voltage was higher, and had the tendency of saturation. The dielectric loss value of the water-containing test material of insulating paperboard even showed a downward trend. A mathematical model of dielectric loss change in insulating medium with local defects is established, and the variation law of dielectric loss value of each sample under the influence of partial discharge is explained. The correlation between dielectric loss and PD statistical parameters is analyzed, and the correlation characteristics between the increment of dielectric loss and the fundamental component of PD 50Hz are studied. The results show that with the development of PD, the variation of dielectric loss is affected by the increase of dielectric loss and the expansion of local defect, the dielectric loss and the total discharge quantity, the total discharge number, the average discharge quantity, the maximum discharge quantity, the total discharge number, the average discharge quantity and the maximum discharge quantity of partial defect. Average discharge pulse length, Hn (q) spectrum deflection, steepness and Weibull distribution? The correlation of coefficient is strong, but it is not monotone linear correlation, and affected by moisture content of insulating paperboard, it is difficult to establish a simple correlation relationship between dielectric loss value and single partial discharge statistical parameter. The fundamental component of PD signal 50Hz has an important effect on the increment of dielectric loss, and the fundamental component of PD 50Hz is affected by the average discharge quantity, the total discharge number and the duration of the discharge pulse. The increment of dielectric loss value of each sample showed a specific variation rule.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM855
本文編號：2292453
[Abstract]:Dielectric loss and partial discharge are important indexes to measure the insulation performance of oil-paper. The correlation between dielectric loss and partial discharge of oil-paper insulation is studied to improve the monitoring and diagnosis level of oil-paper insulation based on dielectric loss and partial discharge. It is of great significance to realize the evaluation of oil-paper insulation based on multiple information fusion. In this paper, an experimental platform for oil paper insulation dielectric loss and partial discharge measurement is set up. The accurate calculation of dielectric loss and partial discharge statistical parameters is realized. The variation characteristics of intermediate loss value, dielectric loss increment and partial discharge statistical parameters during partial discharge development are analyzed. The correlation characteristics of dielectric loss value, dielectric loss increment and partial discharge statistical parameters of oil-paper insulation are studied. The defect model of oil-paper insulation along the surface discharge is designed, and the oil-paper insulation test material with different moisture content is obtained, and the experimental platform of oil-paper insulation dielectric loss and partial discharge measurement is built to meet the needs of signal acquisition for dielectric loss measurement and partial discharge signal. A method for calculating dielectric loss angle based on iterative matching tracing is proposed. The simulation results show that the method can calculate the dielectric loss accurately and stably. Based on the booster test, the variation of dielectric loss and partial discharge statistical parameters of each sample is obtained. The results show that for partial discharge, the total discharge, the maximum discharge and the average discharge increase with the increase of voltage, and the total discharge times and the average discharge pulse length increase first, and then the oscillation decreases. , Hn (q) spectral kurtosis, Weibull distribution? The coefficient is regular, the moisture content of insulating paperboard has great effect on the total discharge, maximum discharge, average discharge,? The same voltage, the higher the moisture content of insulating paperboard, the greater the value of the above parameters and the faster the growth. For dielectric loss, with the increase of voltage, the increment of dielectric loss increased first and then stabilized or decreased. The dielectric loss value of each sample gradually increased, but the increasing rate of dielectric loss value slowed down obviously when the voltage was higher, and had the tendency of saturation. The dielectric loss value of the water-containing test material of insulating paperboard even showed a downward trend. A mathematical model of dielectric loss change in insulating medium with local defects is established, and the variation law of dielectric loss value of each sample under the influence of partial discharge is explained. The correlation between dielectric loss and PD statistical parameters is analyzed, and the correlation characteristics between the increment of dielectric loss and the fundamental component of PD 50Hz are studied. The results show that with the development of PD, the variation of dielectric loss is affected by the increase of dielectric loss and the expansion of local defect, the dielectric loss and the total discharge quantity, the total discharge number, the average discharge quantity, the maximum discharge quantity, the total discharge number, the average discharge quantity and the maximum discharge quantity of partial defect. Average discharge pulse length, Hn (q) spectrum deflection, steepness and Weibull distribution? The correlation of coefficient is strong, but it is not monotone linear correlation, and affected by moisture content of insulating paperboard, it is difficult to establish a simple correlation relationship between dielectric loss value and single partial discharge statistical parameter. The fundamental component of PD signal 50Hz has an important effect on the increment of dielectric loss, and the fundamental component of PD 50Hz is affected by the average discharge quantity, the total discharge number and the duration of the discharge pulse. The increment of dielectric loss value of each sample showed a specific variation rule.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM855
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