本文選題：高壓直流電纜附件 + 硅橡膠��； 參考：《哈爾濱理工大學》2017年碩士論文

【摘要】：隨著柔性直流輸電技術和直流電纜制造技術的日漸成熟,交聯(lián)聚乙烯絕緣高壓直流電纜以其優(yōu)異的性能在跨越海峽輸電、穿越隧道送電和可再生能源發(fā)電等領域成為了直流塑料電纜的首選。在電纜線路中電纜附件扮演著銜接、過渡等重要角色,是電纜系統(tǒng)重要組成部分,同時也是輸電線路的薄弱環(huán)節(jié),故障多發(fā)部位。合理選擇絕緣材料,全面研究電纜附件內(nèi)含有典型缺陷情況下的電場分布規(guī)律,有助于掌握電纜線路運行狀態(tài),及時發(fā)現(xiàn)和修復故障隱患,提高電纜系統(tǒng)的供電可靠性,對高壓直流電纜系統(tǒng)的長期穩(wěn)定運行具有重要意義。本文首先根據(jù)高壓直流電纜附件材料的基礎性能采用多物理場耦合仿真軟件(Comsol Multiphycics)構建出高壓直流電纜附件仿真模型,根據(jù)電纜附件內(nèi)電場分布仿真結果選擇出一種電場分布特性優(yōu)良的增強絕緣與電纜本體絕緣組合方案。其次,基于建立的高壓直流電纜附件仿真模型,仿真研究不同電壓幅值、不同溫度梯度及過電壓條件下電纜附件內(nèi)含有典型缺陷時穩(wěn)態(tài)和暫態(tài)電場分布規(guī)律。最后,探究缺陷位置與最大畸變電場位置的對應關系,并且評估各種缺陷對電纜附件的危害程度。仿真結果發(fā)現(xiàn):在直流電壓作用下,非線性硅橡膠具有較強均化電場分布的能力,使無缺陷的直流電纜附件內(nèi)最大電場分布于電纜本體絕緣中,且外施電壓幅值越高均化電場分布的能力越強;應力錐安裝錯位時,電場畸變程度隨電纜外屏蔽超出應力錐根部距離增加而增大,超出距離過長會導致應力控制體喪失均化電場分布的作用;增強絕緣內(nèi)有氣泡時,電場主要集中在氣泡附近,最大電場強度超過空氣的擊穿場強;應力錐表面存在微小凸起時,會使凸起附近局部電場明顯增強;溫度梯度較大時,電纜接頭本體絕緣內(nèi)出現(xiàn)場強分布翻轉現(xiàn)象,且最大場強位置由高壓屏蔽管端部轉移到應力錐根部附近;電纜本體絕緣表面存在導電微粒時,整個電纜接頭內(nèi)的最大場強都位于導電微粒邊緣。在直流疊加沖擊電壓作用下,無論疊加同極性還是反極性沖擊電壓,沖擊過程中電纜附件內(nèi)最大場強始終位于線芯附近的交聯(lián)聚乙烯絕緣內(nèi),且疊加同極性沖擊電壓過程的最大場強高于疊加反極性沖擊電壓過程中最大場強。
[Abstract]:With the development of flexible DC transmission technology and DC cable manufacturing technology, XLPE insulated HVDC cable is transmitted across straits with its excellent performance. Power generation through tunnels and renewable energy has become the first choice of DC plastic cables. Cable accessories play an important role in the connection and transition of cable lines, which is an important part of cable system, and is also the weak link of transmission lines and the location of multiple faults. The reasonable selection of insulating materials and the comprehensive study of the electric field distribution law in the case of typical defects in the cable accessory are helpful to master the running state of the cable line, to discover and repair the hidden trouble in time, and to improve the power supply reliability of the cable system. It is of great significance for the long-term stable operation of HVDC cable system. In this paper, according to the basic properties of HVDC cable accessories, the simulation model of HVDC cable accessories is constructed by Comsol Multiphycics. According to the simulation results of electric field distribution in cable accessories, a combination scheme of enhanced insulation and cable body insulation with excellent electric field distribution characteristics is selected. Secondly, based on the simulation model of HVDC cable accessories, the distribution of steady and transient electric fields under different voltage amplitude, different temperature gradient and overvoltage is studied. Finally, the relationship between the defect location and the maximum distorted electric field position is explored, and the harm of various defects to cable accessories is evaluated. The simulation results show that the nonlinear silicone rubber has a strong ability to homogenize the electric field distribution under the action of DC voltage, so that the maximum electric field in the accessories of the non-defective DC cable is distributed in the insulation of the cable body. The higher the amplitude of applied voltage is, the stronger the ability of homogenizing electric field distribution is, and when the stress cone is mislocated, the degree of electric field distortion increases with the distance of the shield outside the cable beyond the root of the stress cone increasing. When there are bubbles in the reinforcement insulation, the electric field mainly concentrates near the bubble, the maximum electric field intensity exceeds the breakdown field intensity of the air, and when the surface of the stress cone is slightly raised, the electric field will lose the effect of homogenizing the distribution of the electric field when the distance is too long. When the temperature gradient is high, the distribution of field intensity flips in the insulation of the cable joint, and the position of the maximum field intensity is transferred from the end of the high voltage shield pipe to the root of the stress cone. When there are conductive particles on the insulation surface of the cable, the maximum field strength of the cable joint is located at the edge of the conductive particle. Under the action of DC superposition impulse voltage, the maximum field strength of cable accessory is always located in the cross-linked polyethylene insulation near the wire core during the shock process, regardless of the superposition of the same polarity or reverse polarity impulse voltage. The maximum field strength of the superposition of the same polarity impulse voltage is higher than that of the superposed reverse polarity impulse voltage.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75

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