【摘要】：供電可靠性是電力系統(tǒng)運(yùn)行的一個(gè)重要指標(biāo),對(duì)于220kV變電站來說尤為重要。變電站中設(shè)備是否運(yùn)行可靠直接影響著電網(wǎng)的運(yùn)行可靠。220kV和平變承擔(dān)著給撫順鋁廠這樣的重要客戶供電的任務(wù)。其投運(yùn)于1989年,運(yùn)行已超過20年,大部分設(shè)備陳舊。其中220kV五號(hào)主變一次開關(guān)、北平二線開關(guān)為L(zhǎng)W15型氣動(dòng)機(jī)構(gòu),不適合撫順地區(qū)寒冷的天氣。另外一些220kV斷路器的分合閘次數(shù)已達(dá)臨界值,且一些斷路器為進(jìn)口設(shè)備無法返廠大修。斷路器的銹蝕也非常嚴(yán)重,同時(shí)瓷柱為非防污、非高強(qiáng)瓷,容易發(fā)生污閃或瓷柱斷裂事故。這些基礎(chǔ)設(shè)備存在嚴(yán)重安全隱患,應(yīng)盡快進(jìn)行改造更換。項(xiàng)目目標(biāo)為220kV間隔改造,將和平變220kV開關(guān)電氣設(shè)備及母線全部拆除,在原址新建220kV電氣設(shè)備,主變位置不變。主接線由原來的雙母線帶旁路接線改成雙母線接線;所有保護(hù)自動(dòng)化裝置及66kV、10kV電氣一次設(shè)備不更換。論文分為六部分論述。第一章介紹和平變的改造背景及變電站設(shè)計(jì)的現(xiàn)狀、發(fā)展趨勢(shì)。第二章從理論層面分析變電站的設(shè)計(jì),對(duì)主變壓器的選擇、電氣主接線選擇、所用電及直流系統(tǒng)、通信及防雷部分做出具體討論。第三章分析和平變運(yùn)行現(xiàn)狀,得出存在的問題。第四章為和平變改造方案的研究。給出了改造后的平面布置圖。第五章為改造前后運(yùn)行對(duì)比,改造后的供電可靠性較之前有很大的提高。最后對(duì)本次工程改造所取得的成果及管理創(chuàng)新給出了分析。
[Abstract]:Power supply reliability is an important index of power system operation, especially for 220kV substations. The reliability of the equipment in the substation directly affects the reliability of the power grid. 220 kV peace transformer undertakes the task of supplying power to the important customers such as Fushun Aluminum Plant. It was put into operation in 1989, has been in operation for more than 20 years, most of the equipment obsolete. One switch of 220 kV No. 5 main transformer is LW15 pneumatic mechanism, which is not suitable for cold weather in Fushun area. The switching times of some 220kV circuit breakers have reached the critical value, and some circuit breakers are unable to be overhauled for imported equipment. The corrosion of circuit breaker is also very serious. At the same time, the porcelain pole is not anti-fouling, non-high strength porcelain, easy to occur pollution flashover or porcelain pole fracture accident. These foundation equipments have serious safety hidden trouble, should be reformed and replaced as soon as possible. The aim of the project is to retrofit the 220kV interval, remove all the electrical equipment and busbar of the 220kV switchgear and bus, and build the new 220kV electrical equipment at the original site without changing the position of the main transformer. The main connection is changed from the original double bus by-pass connection to the double bus connection; all protection automation devices and 66kV, 10kV primary electrical equipment are not replaced. The thesis is divided into six parts. The first chapter introduces the background of the transformation and the current situation and development trend of substation design. In chapter 2, the design of substation is analyzed theoretically, and the selection of main transformer, electric main connection, electric power and DC system, communication and lightning protection are discussed in detail. The third chapter analyzes the current situation of peace change operation, and obtains the existing problems. The fourth chapter is the study of peaceful transformation scheme. The plane layout diagram after modification is given. The fifth chapter compares the operation before and after the retrofit, and the reliability of the power supply after the transformation has been greatly improved. Finally, the achievements and management innovation of this project transformation are analyzed.
【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】：2017
【分類號(hào)】：TM63

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