本文選題：整流變壓器　切入點(diǎn)：電子式互感器　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：大容量整流電源在冶金行業(yè),特別在鋁電解行業(yè)具有舉足輕重的地位,其正常運(yùn)行直接關(guān)系到整個(gè)生產(chǎn)系列的安全穩(wěn)定,一個(gè)年產(chǎn)15萬噸的電解系列,停電5個(gè)小時(shí)其損失可達(dá)幾千萬元,整流變壓器作為電解鋁系列供電的核心設(shè)備,其保護(hù)配置顯得尤為重要,同時(shí),整流變壓器不同于一般的電力變壓器,其繼電保護(hù)的配置要滿足整流機(jī)組對(duì)繼電保護(hù)的特殊要求,且由于整流變壓器閥側(cè)為多繞組、大電流,無法安裝常規(guī)電流互感器,測(cè)量非常困難,對(duì)變壓器差動(dòng)保護(hù)的配置造成了困難,因此目前未設(shè)置差動(dòng)保護(hù),僅由瓦斯保護(hù)作為變壓器內(nèi)部故障的主保護(hù),同時(shí)設(shè)置兩套過電流保護(hù)等后備保護(hù),整流變壓器繼電保護(hù)配置的完善與否,直接關(guān)系著電網(wǎng)的穩(wěn)定運(yùn)行。因此,要采取一切可能的措施保證整流電源的正常運(yùn)行,完善、可靠的保護(hù)設(shè)置可以及早發(fā)現(xiàn)機(jī)組異常情況,及時(shí)切除故障,防止事故擴(kuò)大,對(duì)保證系統(tǒng)安全運(yùn)行具有重要意義。 近年來,全國先后有多個(gè)大型電解系列的整流柜短路爆炸,整流變壓器燒毀,嚴(yán)重影響生產(chǎn)(如青銅峽邁克鋁業(yè))。造成這種嚴(yán)重事故的一個(gè)重要原因往往是發(fā)生短路時(shí),繼電保護(hù)未能及時(shí)動(dòng)作使高壓側(cè)斷路器及時(shí)跳開,或者是存在保護(hù)死區(qū),未能及時(shí)切除故障。因此整流變壓器繼電保護(hù)的正確和完善配置,對(duì)冶金企業(yè)正常生產(chǎn)及電網(wǎng)安全運(yùn)行具有重要意義。 本文完成了大容量整流變壓器閥側(cè)大電流的采集方案研究、整流變壓器差動(dòng)保護(hù)模塊化配置的實(shí)現(xiàn)方法,并提出工程化實(shí)施方案,以解決目前大容量整流變壓器沒有配置差動(dòng)保護(hù)的現(xiàn)狀。
[Abstract]:Large capacity rectifier power supply plays an important role in metallurgical industry, especially in aluminum electrolysis industry. Its normal operation is directly related to the safety and stability of the entire production series, an electrolytic series with an annual output of 150000 tons. As the core equipment of electrolytic aluminum series power supply, the protection configuration of rectifier transformer is especially important. At the same time, the rectifier transformer is different from ordinary power transformer. The configuration of relay protection should meet the special requirements of rectifier unit for relay protection, and because the valve side of rectifier transformer is multi-winding and high current, it can not install conventional current transformer, so it is very difficult to measure. The configuration of transformer differential protection is difficult, so there is no differential protection, only gas protection is used as the main protection of transformer internal fault, and two sets of backup protection, such as overcurrent protection, are set up at the same time. Whether the relay protection configuration of rectifier transformer is perfect or not is directly related to the stable operation of the power network. Therefore, all possible measures should be taken to ensure the normal operation and perfection of the rectifier power supply. The reliable protection setting can detect the abnormal condition of the unit as soon as possible, remove the fault in time and prevent the accident from expanding, which is of great significance to ensure the safe operation of the system. In recent years, many large electrolytic series rectifier cabinets have exploded in short circuit and the rectifier transformer has been destroyed, which seriously affects the production (such as the Qingtongxia Mike Aluminum Industry). One of the important causes of this kind of serious accident is often short circuit. The relay protection fails to operate in time to make the high voltage side circuit breaker jump off in time, or there is a dead zone of protection, and the fault can not be removed in time. Therefore, the correct and perfect configuration of the relay protection of rectifier transformer, It is of great significance to the normal production of metallurgical enterprises and the safe operation of power grid. In this paper, the acquisition scheme of high current on valve side of large capacity rectifier transformer is studied, the method of modularization configuration of differential protection for rectifier transformer is realized, and the engineering implementation scheme is put forward. In order to solve the problem that large capacity rectifier transformer does not have differential protection.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM774

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本文編號(hào)：1646532