基于PLC控制的主变冷却器系统的改造
发布时间：2019-05-09 19:15
【摘要】：为了积极推进国家电网公司的“三集五大”体系建设,500kV变电站都在逐渐向少人化、无人化的方向发展。运行人员的减少必然对设备的可靠性提出了更高的要求。台州某500kV变电站主变冷却器由于采用传统的电磁型继电器控制,在运行中出现了元器件故障率高、实现的功能简单、存在设计缺陷等问题。为了提高主变冷却器的运行可靠性,以主变大修为契机,提出了基于PLC控制的主变冷却器控制系统的改造方案。该冷却器控制系统选择西门子S7-200(CPU226)作为可编程逻辑控制器,以主变上层油温和主变负荷作为控制条件,利用软件编程实现对主变冷却器的风扇组和油泵的智能化投切控制。 本文对原主变冷却器控制系统在交流电源回路、交流控制回路、冷却器全停回路和箱体辅助回路存在的问题和设计缺陷进行了分析,并逐一提出了改造方案。改造后的主变冷却器控制系统采用双PLC的冗余配置,外围电路以固态继电器为主,实现了六种灵活的冷却器运行模式。本人对外围电路进行了设计,并结合PLC控制,对六种运行模式进行了详细的分析说明。同时利用西门子S7-200与TD200的通讯实现简单的人机交互,与监控后台的通讯实现冷却器运行状态的远方监控。改造后的冷却器控制系统在投入运行后,运行状况良好,达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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
本文编号：2473018
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
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