干式空心电抗器匝间绝缘材料老化研究
发布时间：2019-04-17 09:47
【摘要】：为了加强电力系统的稳定性、提高电能输送质量,干式空心电抗器得到广泛的应用,电抗器的安全运行与否对电力系统至关重要。电抗器的损坏主要是由其匝间绝缘失效引起的,因此研究干式空心电抗器匝间绝缘老化特性,对提高干式空心电抗器的产品质量,降低运行过程中其匝间绝缘的故障率有重要的意义。本文参考干式空心电抗器的制造工艺设计制作了类电抗器匝间绝缘结构模型线棒,并根据模型线棒规格设计制作了试验用电极,同时搭建了工频电老化及击穿、过电压累积作用和热老化试验平台;使用工频电老化试验平台进行了恒定电压老化和步进电压老化试验,得到了两种加压方式下的电老化试验数据,并对数据进行了统计分析;使用过电压累积作用试验平台进行过电压累积作用试验,期间在每个老化周期后获取起始局部放电电压和绝缘电阻数据,在设计过电压累作用全部周期完成后使用工频击穿试验平台对模型线棒进行工频击穿试验获取击穿电压数据;使用热老化试验平台进行单一热老化试验,对应于不同的运行年限设计了多个热老化周期,在未老化及每个老化周期结束时测量模型线棒的起始局部放电电压及绝缘电阻,在设计热老化全部周期完成后对模型线棒进行工频击穿、直流击穿和指数衰减振荡波下击穿试验获取击穿电压数据;进行了热老化后模型线棒的耐过电压累积作用试验获得了施加电压和击穿时间数据。研究结果表明:步进电压老化试验得到的寿命指数n不能很好地外推到电抗器工作寿命;起始局部放电电压和绝缘电阻与电抗器匝间绝缘损伤程度有很大的相关性;过电压累积作用对电抗器匝间绝缘影响很大;单一热老化对电抗器匝间绝缘影响不大;热老化之后耐受过电压能力下降。
[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.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM47
本文编号：2459317
[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.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM47
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