Research On Anti-interference And Configuration Of 35kV Oil Field Line Microcomputer Protection

Along with our country electric power industry technology development, the scale of power grid subsequently expands unceasingly, and power grid structure is more complicated, and system capacity is growing too. The microcomputer relay protection device is a kind of device used to reflect the power system faults and abnormal working conditions, and in the role of operation on circuit breaker trip and equipment which gives warning signs. So along with the rapid development of the electric power industry and the rising of voltage level, the requirement for microcomputer protection device is also much higher. Therefore to improve the performance of the microcomputer protection device, has important theoretical and practical significance for electric power system.The oilfield power grid is in itself a huge electromagnetic net, and this electromagnetic net will produce inevitably electromagnetic interference for power equipment, especially for the weak microcomputer protection device. And inside the oilfield grid, electromagnetic interference is often caused by electrical equipment operation, electrostatic field and magnetic field around electrical equipments, and corona and electromagnetic wave radiation etc. The electromagnetic interference causes extremely easily microcomputer protection device malfunction. So to take research on interference resistance and configuration of oil field power system microcomputer protection, and take the necessary anti-interference measures has important practical significance for its application in the field.This paper analyzes the basic principles of the power system protection system , conducts in-depth discussion of the principle of its hardware architecture, software design and setting and commonly used algorithms. Combined with my professional practice, the paper analyzes a variety of interference sources and transmission path in the current oil field power, and studies anti-jamming measures of oil field power microprocessor protection devices, and gives the anti-jamming measures for application for the secondary circuit and microprocessor protection devices, which provides a good idea for the microprocessor protection for its application on site.Based on the analysis of the configuration and the principle of 35kV oil field line microcomputer protection, this paper take the MATLAB / simulink as the simulation software and build some computer simulation models with different protection algorithms, a supply model with 35kV dual-terminal power supply of oil filed power system and simulation model of 35kV three-step current protection, and by setting different points of failure, different fault types for simulation. Finally, the results of the analysis of numerical examples verify the accuracy of the model built. The paper also gives the performance analysis of various algorithms.