本文關(guān)鍵詞： 并聯(lián)轉(zhuǎn)移 弧壓值 燃弧能量 真空介質(zhì)恢復(fù)強(qiáng)度　出處：《沈陽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前我國電力行業(yè)迅猛發(fā)展,各發(fā)電廠的裝機(jī)容量不斷擴(kuò)大,短路電流容量也快速增長。大功率發(fā)電機(jī)出口發(fā)生短路故障時(shí),最大短路電流值將達(dá)10kA以上。傳統(tǒng)的限流器不僅很難分?jǐn)啻笕萘康亩搪冯娏?在分?jǐn)嘀鞍l(fā)電機(jī)或變壓器繞組很有可能已經(jīng)損壞,導(dǎo)致巨大的經(jīng)濟(jì)損失。研制新式的短路電流限制器將已成為電力行業(yè)的迫切需求。目前為了滿足我國市場的需求,一種新型實(shí)用并能限制大容量故障短路電流的限流器的研發(fā)勢在必行,除了會(huì)為電力行業(yè)的發(fā)電廠和變電站帶來好處,也可使用在電力系統(tǒng)以外的化工、冶金、艦船及核聚變試驗(yàn)裝置等相關(guān)的大型電力供應(yīng)成套設(shè)備上,具有很大的研發(fā)前景和市場。本文研究的是一種并聯(lián)轉(zhuǎn)移型的大容量短路故障限流器,應(yīng)用真空大電流并聯(lián)轉(zhuǎn)移原理,當(dāng)大容量短路故障發(fā)生時(shí),由主回路真空熔斷器先起弧,然后故障短路電流迅速地轉(zhuǎn)移到并聯(lián)支路高壓石英砂熔斷器上,最后由其進(jìn)行分?jǐn)嘞蘖�。為確保這種限流器整體結(jié)構(gòu)并聯(lián)轉(zhuǎn)移的可行性,并最終能夠成功可靠地開斷大容量故障短路電流,本文首先應(yīng)用Matlab/Simulink模塊建立了故障短路電流并聯(lián)轉(zhuǎn)移的電路模型,對短路電流并聯(lián)轉(zhuǎn)移的影響因素進(jìn)行了仿真分析,還進(jìn)一步對短路電流的并聯(lián)轉(zhuǎn)移電路模型進(jìn)行了修正,得到了可靠的并聯(lián)轉(zhuǎn)移的動(dòng)態(tài)仿真過程。然后應(yīng)用Ansys有限元軟件對高壓石英砂熔斷器熔體進(jìn)行熱電耦合的仿真,求不同熔體結(jié)構(gòu)對應(yīng)的弧前時(shí)間。并基于半經(jīng)驗(yàn)公式對高壓石英砂熔斷器的熔體進(jìn)行電弧模型的建立,得到不同結(jié)構(gòu)熔體的總弧壓值和燃弧能量值。最后結(jié)合試驗(yàn)驗(yàn)證了主回路真空熔斷器能否承受住線路總弧壓值,達(dá)到其真空介質(zhì)絕緣強(qiáng)度的恢復(fù),不再發(fā)生重?fù)舸?最終保證限流器的限流開斷成功。通過多次試驗(yàn)結(jié)果可以驗(yàn)證,本文所提出的大容量故障短路電流并聯(lián)轉(zhuǎn)移的模型是正確的,該限流器限制大容量短路電流的策略是可行的。
[Abstract]:At present, with the rapid development of power industry in China, the installed capacity of power plants is expanding, and the short-circuit current capacity is also increasing rapidly. When short-circuit faults occur at the outlet of high-power generators, The maximum short-circuit current value will be more than 10 Ka. Not only is it very difficult for the traditional current limiter to break the short-circuit current of large capacity, but the generator or transformer windings may have been damaged before breaking. The development of a new short-circuit current limiter will become an urgent demand in the power industry. At present, in order to meet the needs of the Chinese market, The development of a new type of practical current limiter that can limit the short-circuit current of a large capacity fault is imperative. In addition to bringing benefits to power plants and substations in the power industry, it can also be used in chemical and metallurgical industries outside the power system. There is a great prospect and market for research and development of large power supply complete sets of equipment related to ship and nuclear fusion test equipment. This paper studies a parallel transfer type large capacity short circuit fault current limiter. Based on the principle of vacuum high current parallel transfer, when a large capacity short circuit fault occurs, the main circuit vacuum fuse starts to arc first, and then the fault short circuit current is quickly transferred to the parallel branch high voltage quartz sand fuse. In order to ensure the feasibility of parallel transfer of the whole structure of the current limiter, and finally to successfully and reliably open the fault short-circuit current of large capacity, In this paper, the circuit model of parallel transfer of fault short-circuit current is established by using Matlab/Simulink module, and the influence factors of shunt transfer of short-circuit current are simulated and analyzed, and the model of shunt transfer circuit of short-circuit current is further modified. A reliable dynamic simulation process of parallel transfer is obtained, and then the thermoelectric coupling simulation of high pressure quartz sand fuse melt is carried out by using Ansys finite element software. Based on the semi-empirical formula, the arc model of high pressure quartz sand fuse was established. The values of total arc voltage and arc burning energy of melt with different structures are obtained. Finally, combined with experiments, it is verified that the main circuit vacuum fuse can withstand the total arc voltage of the line, so that the insulation strength of its vacuum medium can be recovered, and no heavy strike will occur. It is proved by many experiments that the model of parallel transfer of large capacity fault short circuit current proposed in this paper is correct, and the strategy of limiting large capacity short circuit current is feasible.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM471

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