【摘要】：為了加強電力系統(tǒng)的穩(wěn)定性、提高電能輸送質(zhì)量,干式空心電抗器得到廣泛的應(yīng)用,電抗器的安全運行與否對電力系統(tǒng)至關(guān)重要。電抗器的損壞主要是由其匝間絕緣失效引起的,因此研究干式空心電抗器匝間絕緣老化特性,對提高干式空心電抗器的產(chǎn)品質(zhì)量,降低運行過程中其匝間絕緣的故障率有重要的意義。本文參考干式空心電抗器的制造工藝設(shè)計制作了類電抗器匝間絕緣結(jié)構(gòu)模型線棒,并根據(jù)模型線棒規(guī)格設(shè)計制作了試驗用電極,同時搭建了工頻電老化及擊穿、過電壓累積作用和熱老化試驗平臺;使用工頻電老化試驗平臺進行了恒定電壓老化和步進電壓老化試驗,得到了兩種加壓方式下的電老化試驗數(shù)據(jù),并對數(shù)據(jù)進行了統(tǒng)計分析;使用過電壓累積作用試驗平臺進行過電壓累積作用試驗,期間在每個老化周期后獲取起始局部放電電壓和絕緣電阻數(shù)據(jù),在設(shè)計過電壓累作用全部周期完成后使用工頻擊穿試驗平臺對模型線棒進行工頻擊穿試驗獲取擊穿電壓數(shù)據(jù);使用熱老化試驗平臺進行單一熱老化試驗,對應(yīng)于不同的運行年限設(shè)計了多個熱老化周期,在未老化及每個老化周期結(jié)束時測量模型線棒的起始局部放電電壓及絕緣電阻,在設(shè)計熱老化全部周期完成后對模型線棒進行工頻擊穿、直流擊穿和指數(shù)衰減振蕩波下?lián)舸┰囼灚@取擊穿電壓數(shù)據(jù);進行了熱老化后模型線棒的耐過電壓累積作用試驗獲得了施加電壓和擊穿時間數(shù)據(jù)。研究結(jié)果表明:步進電壓老化試驗得到的壽命指數(shù)n不能很好地外推到電抗器工作壽命;起始局部放電電壓和絕緣電阻與電抗器匝間絕緣損傷程度有很大的相關(guān)性;過電壓累積作用對電抗器匝間絕緣影響很大;單一熱老化對電抗器匝間絕緣影響不大;熱老化之后耐受過電壓能力下降。
[Abstract]:In order to enhance the stability of power system and improve the quality of power transmission, dry hollow reactor has been widely used. The safe operation of reactor is very important to power system. The damage of the reactor is mainly caused by its inter-turn insulation failure. Therefore, the study on the aging characteristics of dry-type hollow reactor inter-turn insulation can improve the product quality of the dry type hollow reactor. It is of great significance to reduce the fault rate of inter-turn insulation during operation. In this paper, reference to the manufacturing process of dry type hollow reactor, the model wire rod of interturn insulation structure of reactor-like reactor is designed and manufactured, and the electrode for test is designed according to the specification of model wire rod. At the same time, the aging and breakdown of power frequency are built up at the same time. Overvoltage accumulation and thermal aging test platform; The constant voltage aging and step voltage aging tests were carried out by using the power frequency electric aging test platform, and the electrical aging test data under two kinds of pressure modes were obtained, and the data were statistically analyzed. The over-voltage accumulation test platform is used to carry out the over-voltage accumulation test, during which the initial partial discharge voltage and insulation resistance data are obtained after each aging period. Power-frequency breakdown test platform is used to obtain breakdown voltage data from the power-frequency breakdown test of the model rod after the design of the whole cycle of overvoltage breakdown is completed. The thermal aging test platform was used to carry out the single thermal aging test. Several thermal aging cycles were designed corresponding to the different operating life. The initial partial discharge voltage and insulation resistance of the model rod were measured at the end of each aging period and the non-aging period, and the initial partial discharge voltage and insulation resistance of the model rod were measured. The breakdown voltage data were obtained by power frequency breakdown test, DC breakdown test and exponential attenuation oscillation wave breakdown test on the model rod after the design of the whole cycle of thermal aging was completed. The data of applied voltage and breakdown time were obtained by the accumulative effect test of the overvoltage of the model rod after thermal aging. The results show that the life index n obtained from step-by-step voltage aging test can not be extrapolated to the working life of reactor, and the initial partial discharge voltage and insulation resistance have great correlation with the degree of insulation damage between turns of reactor, and there is a significant correlation between the initial partial discharge voltage and insulation resistance and the degree of inter-turn insulation damage of reactor. The accumulative effect of overvoltage has a great influence on the inter-turn insulation of the reactor, the single thermal aging has little effect on the inter-turn insulation of the reactor, and the resistance to overvoltage decreases after the thermal aging.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM47

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