【摘要】：為了積極推進國家電網(wǎng)公司的“三集五大”體系建設(shè),500kV變電站都在逐漸向少人化、無人化的方向發(fā)展。運行人員的減少必然對設(shè)備的可靠性提出了更高的要求。臺州某500kV變電站主變冷卻器由于采用傳統(tǒng)的電磁型繼電器控制,在運行中出現(xiàn)了元器件故障率高、實現(xiàn)的功能簡單、存在設(shè)計缺陷等問題。為了提高主變冷卻器的運行可靠性,以主變大修為契機,提出了基于PLC控制的主變冷卻器控制系統(tǒng)的改造方案。該冷卻器控制系統(tǒng)選擇西門子S7-200(CPU226)作為可編程邏輯控制器,以主變上層油溫和主變負荷作為控制條件,利用軟件編程實現(xiàn)對主變冷卻器的風扇組和油泵的智能化投切控制。 本文對原主變冷卻器控制系統(tǒng)在交流電源回路、交流控制回路、冷卻器全�；芈泛拖潴w輔助回路存在的問題和設(shè)計缺陷進行了分析,并逐一提出了改造方案。改造后的主變冷卻器控制系統(tǒng)采用雙PLC的冗余配置,外圍電路以固態(tài)繼電器為主,實現(xiàn)了六種靈活的冷卻器運行模式。本人對外圍電路進行了設(shè)計,并結(jié)合PLC控制,對六種運行模式進行了詳細的分析說明。同時利用西門子S7-200與TD200的通訊實現(xiàn)簡單的人機交互,與監(jiān)控后臺的通訊實現(xiàn)冷卻器運行狀態(tài)的遠方監(jiān)控。改造后的冷卻器控制系統(tǒng)在投入運行后,運行狀況良好,達到了本次改造的目的。
[Abstract]:In order to actively promote the construction of the "three episodes and five major" system of the State Grid Company, 500kV substations are gradually developing in the direction of less people and no man. The reduction of operators is bound to put forward higher requirements for the reliability of equipment. Due to the traditional electromagnetic relay control, the main transformer cooler in Taizhou 500kV substation has some problems, such as high failure rate of components, simple function, design defects and so on. In order to improve the operation reliability of the main transformer cooler, taking the overhaul of the main transformer as an opportunity, the transformation scheme of the main transformer cooler control system based on PLC control is put forward. The control system of the cooler selects Siemens S7 V200 (CPU226) as the programmable logic controller, and takes the upper oil temperature and the main load of the main transformer as the control conditions. The intelligent switching control of fan assembly and oil pump of main transformer cooler is realized by software programming. In this paper, the problems and design defects of the original main transformer cooler control system in AC power supply circuit, AC control circuit, cooler stop circuit and box auxiliary circuit are analyzed, and the improvement scheme is put forward one by one. The modified main transformer cooler control system adopts the redundant configuration of double PLC, and the peripheral circuit is mainly solid state relay, and six kinds of flexible cooler operation modes are realized. I have designed the peripheral circuit, and combined with the PLC control, have carried on the detailed analysis to the six operation modes. At the same time, the communication between Siemens S7 / 200 and TD200 is used to realize simple human-computer interaction, and the communication with the monitoring background is used to realize the remote monitoring of the running state of the cooler. After being put into operation, the reformed cooler control system is in good condition and achieves the purpose of this retrofit.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM407

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