發(fā)布時間：2018-06-18 11:46

  本文選題：復(fù)合支柱絕緣子 + 高海拔　； 參考：《華南理工大學(xué)》2014年博士論文

【摘要】：為有效改善復(fù)合支柱絕緣子的直流污閃特性，增加換流站外絕緣裕度，本文首次在高海拔地區(qū)系統(tǒng)地開展了復(fù)合支柱絕緣子傘裙參數(shù)優(yōu)化研究，并全面開展了傘裙參數(shù)優(yōu)化后的大尺寸復(fù)合支柱絕緣子（5支復(fù)合支柱絕緣子串聯(lián)）直流污閃特性的研究。主要內(nèi)容如下： 1）基于電磁場理論，利用ANSYS軟件采用有限元法建立一大一小傘形和一大兩小傘形的大尺寸染污復(fù)合支柱絕緣子仿真模型（5支復(fù)合支柱絕緣子串聯(lián)），對不同傘裙參數(shù)的復(fù)合支柱絕緣子的沿面電場分布特性進行仿真研究，通過對比分析沿面平均電場強度和沿面電場不均勻系數(shù)，揭示了復(fù)合支柱絕緣子傘伸出、傘間距對沿面電場分布的影響規(guī)律，給出了相對應(yīng)的參數(shù)優(yōu)化范圍，為后續(xù)傘裙優(yōu)化試驗所需的復(fù)合支柱絕緣子試品提供了傘裙參數(shù)范圍。 2）以仿真研究推薦的試品參數(shù)范圍為基礎(chǔ)，選取各類具有代表性不同傘裙參數(shù)的支柱絕緣子試品，在昆明國家特高壓工程實驗室進行歷時9個月的自然積污試驗，所有試驗試品均在相同自然環(huán)境中放置9個月，通過對比各類試品表面自然積污量的大小，揭示了不同傘裙參數(shù)、不同材質(zhì)和帶電狀態(tài)等因素對支柱絕緣子自然積污特性的影響規(guī)律，為復(fù)合支柱絕緣子的選型和設(shè)計提供了優(yōu)選方案。 3）對50余支不同傘裙參數(shù)的復(fù)合支柱絕緣子試品進行了人工污穢試驗，系統(tǒng)地研究了傘裙參數(shù)對直流污閃電壓的影響規(guī)律，給出了最優(yōu)的傘裙參數(shù)值，推薦了大傘伸出和大傘間距的最佳配比值及取值范圍；基于最小均方差法，擬合構(gòu)建了傘伸出、傘間距與直流污閃電壓的二次函數(shù)關(guān)系，并從沿面電阻、紫外放電特性、沿面電弧發(fā)展特性和爬電距離利用率方面探討了傘裙參數(shù)對復(fù)合支柱絕緣子直流污閃電壓的影響機理。 4）研究了優(yōu)化后的大尺寸復(fù)合支柱絕緣子（5支復(fù)合支柱絕緣子串聯(lián)）的直流污閃特性，獲得了兩類不同傘形結(jié)構(gòu)下大尺寸復(fù)合支柱絕緣子直流耐受電壓曲線和污穢因素（鹽密、灰密和污穢不均勻分布）對直流污閃電壓的影響規(guī)律，對比了大尺寸試品和短串試品的直流耐受電壓曲線，驗證了直流污閃電壓與復(fù)合支柱絕緣子串長的線性關(guān)系；通過對試品沿面電阻、紫外放電特性和沿面電弧發(fā)展特性的研究，探討了污穢因素影響直流污閃特性的本質(zhì)，分析了造成大尺寸試品與短串試品直流污閃特性差異的原因。 5）通過分析換流站自然污穢量的污穢成分，并對其污穢測量值進行修正，，確定了換流站外絕緣污穢水平，然后基于傘裙優(yōu)化研究結(jié)果，直接采用優(yōu)化后的大尺寸復(fù)合支柱絕緣子試品（5支復(fù)合支柱絕緣子串聯(lián)）的試驗數(shù)據(jù)，運用污耐壓法對±800kV楚雄特高壓直流換流站的復(fù)合支柱絕緣子串長進行了優(yōu)化設(shè)計，并對即將建設(shè)的±500kV富寧、永仁超高壓直流換流站復(fù)合支柱絕緣子的外絕緣尺寸進行了設(shè)計。
[Abstract]:In order to improve the DC flashover performance of composite strut insulator effectively and increase the outer insulation margin of converter station , the research on parameter optimization of composite strut insulator umbrella skirt was carried out in high altitude area for the first time .

1 ) Based on the theory of electromagnetic field , the finite element method was used to establish a large and small umbrella - shaped large - sized composite strut insulator simulation model ( 5 composite strut insulators series ) , and the distribution characteristics of the composite strut insulators with different umbrella skirt parameters were simulated .

2 ) Based on the range of test article parameters recommended by simulation research , all kinds of pillar insulator test article with representative different umbrella skirt parameters were selected . All the test articles were placed in the same natural environment for 9 months . All the test articles were placed in the same natural environment for 9 months , and the influence law of different umbrella skirt parameters , different materials and charged states on the natural contamination characteristics of the pillar insulators was revealed by comparing the size of the natural product contamination on the surface of various test articles . The selection and design of the composite column insulators provided the preferred scheme .

3 ) The influence of the parameters of the umbrella skirt on the DC flashover voltage is studied systematically , and the optimal value of the umbrella skirt parameter is given , and the optimum ratio and the range of the value of the big umbrella extension and the large umbrella spacing are recommended .
Based on the minimum mean square error method , the quadratic function relation of the umbrella extension , the spacing of the umbrella and the DC flashover voltage is fitted , and the influence mechanism of the parameters of the umbrella skirt on the DC flashover voltage of the composite strut insulator is discussed from the aspect of the surface resistance , the ultraviolet discharge characteristic , the development characteristic of the surface arc and the utilization rate of creepage distance .

4 ) The DC flashover characteristics of the optimized large - sized composite strut insulators ( series of five composite strut insulators ) were studied . The effects of DC withstand voltage curves and contamination factors ( salt density , ash density , and dirty non - uniform distribution ) on DC flashover voltage were obtained . The linear relationship between DC flashover voltage and insulator string length was verified by comparing the DC withstand voltage curve of the large - sized test article and the short - string test article .
Based on the study of surface resistance , ultraviolet discharge characteristics and arc development characteristics of the test article , the essence of the influence of the pollution factors on the characteristics of DC flashover is discussed , and the reason of the difference between the direct current emission characteristics of the large - sized test article and the short - string test article is analyzed .

5 ) By analyzing the dirt content of the natural sewage of the converter station and correcting the dirty measurement value , the test data of the outer insulation pollution level of the converter station is determined , and then the optimization design of the composite strut insulator string of the 鹵 800kV Chuxiong ultrahigh voltage DC converter station is directly adopted based on the result of the optimization of the umbrella skirt . The external insulation dimensions of the 鹵 500kV FuNing and Yongren ultra - high voltage DC converter are designed .
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TM216

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