Research And Development Of High-Voltage Switchgear Based Intelligent Monitoring System

The inevitable development trend of electric power grid is the realization of intelligent interacts between power generations, transmission, and applications, as well as the effective employment of energy. The Switchgear is one of the key facilities for the switching, controlling and protection of power system. Because of the high-voltage switchgear typically work at an environment with high magnetism, high current and high voltage, so it is very important to monitor and control the high-voltage switchgear for the whole life cycle. But the manual records of the system status exist serious deficiency in security, accuracy, real-time performance. It is thus of critical importance to develop a switchgear with functions of self-test, self-check, automatic control and online monitoring, by employing modern sensor, microelectronics, computer and other advanced technology. This aim is to meet the requirements of modern electric power automation system.At present, although the development of power system equipment is perfect in our country, the study of intelligent monitoring system for high voltage switchgear needs to be strengthened. The innovation of this thesis lies in the using of low power technology and comprehensive adaptive tuning PID control algorithm and electromagnetic compatibility technology, improving the reliability and stability of system operation in complicated environment.Based on analysis of functional requirements of intelligent monitoring system, this essay proposes the overall design plan, and further divides it into two parts: design and implementations of intelligent monitoring unit and online monitoring platform. The RISC processor ARM7TDMI-S is utilized as the core control chip, and to realize the designed functions including: real-time display of the dynamic schematic of switchgear, the circuit breaker of the high voltage switchgear, and recording car position as well as other working state. The additional functions are the voice prompts of error prevention tips, LCD display, data transmission and other man-machine interactive function. Last but not least, the system possesses the capability of accurate measurement of the internal temperature, high voltage switchgear wireless transmission and automatic control. During the progress of design and implementation, I employ C# object-oriented programming language. Based on Access database, online monitoring platform receive, storage and display the data of the switchgear working state, detecting and dealing with the abnormal situation.At present, the system has passed the installation and commissioning, and has already realized the function of online high-voltage switchgear, which will reduce the cost of operating expenditure. Thus, the work in this thesis has practical significant impacts on improving the switch cabinet operating conditions and enhancing the reliability of the intelligent power system.