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变电站
保护装置
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变电站保护装置设计【说明书+CAD】,变电站,保护装置,设计,说明书,CAD
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毕业设计外文文献学 生 姓 名： 吕晓琳 指导教师： 刘 洋 合作指导教师： 专业名称： 自动化 所在学院： 职业技术学院 2009年 6月Underground mobile substation remote monitoring software for the development and implementationTANG Chao - li , HUANGYou - rui , LINGLiu - yi(Electric and Information Technology College , Anhui University of Science and Technology , Huainan 232001 , China)Abstract :Designs and realizes a coal mine mobile substations monitoring system based on king view. Through network line under mine , the software carries out examination , demonstration , control , protection , warning and management for the mobile substations entire work course on ground , at the same time. It saves workparameters as well as operators operation information to database. The monitoring system provides fast , accurate , comprehensive information for operators who monitor and maintain the mobile substations , and realizes remote monitoring and automated management goal .Key words ：king view; mobile substation ; remote monitor ; industry control computer1 IntroductionMobile substation is a Mobile-powered equipment, Used to put coal mine come from the central high-voltage substation can change low-voltage electricity, Mining area to face production machinery drives provide electrical power to mobile device variable distribution. The safe operation of its mining area as a whole face job a necessary condition for reliability. The event of failure, will have serious consequences. Not only affects production, may also be caused by physical accident. Therefore, the implementation of mobile substation Inoue has become really important for long-range real-time monitoring. Because of financial and technical reasons, small and medium-sized mines in China are mostly not equipped with a remote monitoring system, but through strict implementation of mobile inspection system equipment as the main means to safeguard the normal operation of underground substation. This on the one hand, the mobile substation in the underground, where conditions are poor, patrol officers greater labor intensity; On the other hand, at 2 time interval inspections substation is not timely detection of abnormal operation, operating parameters are not given timely adjustment. To this end, the R & D based on the mobile substation King view remote monitoring system capable of non-interval to carry out the operation of surveillance equipment, and has a sub-reclosing control, such as over-voltage overload alarm function to enhance the mobile substation to monitor the degree of automation, to protect the safety of underground power supply and safety in production.2 System StructureThe system hardware mainly by Advantest Industrial Computer, network lines, communication, conversion interface, such as the composition of the mobile substation; software mainly by King view software, ACCESS database component. Specifically, according to the functions of the entire monitoring system can be divided into 3-layer architecture, including: the control part of monitoring treatment of the data storage parts. Control part refers to the mobile substation to LG as a single-chip central processing unit, using modular design methods, implementation of the leakage, short circuit, overload, overvoltage protection and many other features, is a relatively comprehensive protection system, and can very easy to achieve local control and remote control functions. 3 basic functions of the modular design systemTaking into account the practical requirements, the design of the six basic functions of main modules, the following main modules on its functional analysis:(1) mobile substation monitoring function Monitoring is the normal operation of mobile substation display monitor screen. May indicate that high (low) pressure side of real-time voltage, current, power, power factor and other parameters of size; can display running status and transformer substation switch gear status. At the same time, the button can be achieved through the high (low) pressure side of the reset, electric sub-gate, the electric switch, short circuit tests, load tests, such as control operations.(2) self-test function of the mobile substation Refers to the system are on self-test after the electric system to automatically detect job status, including the setting is correct, whether or not the normal operating voltage, insulation resistance value is normal, short-circuit test and overload test whether the normal function of transformer protection and temperature are normal and so on.(3) Detect module rated parameters Rated parameters of the main Detect completion of the system are rated voltage, rated current and the current level of block detection. Current setting by LG for its single-chip for testing. Detect voltage is mainly used to determine the system over-voltage, under voltage, leakage current value and transformers overheated atresia temperature. Overload protection, short circuit protection are based on current signal as a judge. (4) after the fault detection module Reclosing Reclosing fault detection module after the main power grids are Detect insulation status, current signal, voltage signal, the differential current signal and temperature signals. Reclosing of the power grid after system insulation online status monitoring; Acquisition voltage signal in order to deal with the system are over-voltage and under-voltage breakdown; Detect differential current signal and temperature signal are in order to determine the transformer internal fault, when fault detection to a different system will automatically cut off power supply, at the same time shows the corresponding fault status and parameter values. (5) Record function alarm When the scene of an emergency situation, such as mobile substation had pressure, under-voltage, overload, short circuit failure, the module can realize the voice of alarm, and alarm information transmitted through the configuration interface on LG at the same time have the police records, police Alarm Record, including the date, time, number, status, message text, duration, etc. If the records are one of the yellow that is the fault alarm; red if that is the accident report to the police; if the green that is the fault or incidents have been discharged. (6) data storage function Can put the mobile substation monitoring data, alarm recording, and the operator to operate the various information stored in databases in order to preserve historical data and operator access to these data for future analysis of leadership, decision-making. At the same time, voltage, current, power factor and other parameters is also important to real-time trend curves and curves show the historical trend and is conducive to real-time monitoring of on duty personnel.4Cold Forming line shelves AC servo control system of the basic principles (1) shelf components for the general production process: open-book - the school level - online servo feed punching - forming rolling - straightening - Length cut (or cut off the servo-track) - packaging - post-spray treatment; (2) The units main features: one-time investment costs are relatively high, the largest power AC servo has some restrictions, but low-cost post-operation, especially in the shelf components at a high yield, high-precision products, applications and a wide range of additional value high. 3, automatic feeder and the punching device and the working principle5Control System Design of a number of major issues（1）Input signal control precision: roll circumferential length measuring accuracy and measuring the ratio of final decision on the scope of the production control accuracy, the ratio should be a great choice of products and select the appropriate measurement of roll materials, measurement of roller contact with the cold-formed parts and damping coefficient of elasticity in order to increase the friction coefficient and contact pressure to prevent the measurement error process for selecting the material slide. （2）The control accuracy of the output signal: position loop PID control algorithm on the different PID control determines the control precision and the results, such as: solving step reaction method, and control features in accordance with movements in three characteristics: 1), only proportional control; 2), PI control; 3), PID control; and in accordance with the speed of shape, shape determination of the value of differential expression for PID calculations, the accuracy of the implementation of the corresponding request of the positive and negative movements and control operations. （3）PID tuning system parameters: host computer to send to the PID controller parameters, the parameters to see whether a given control system in line with the requirements of the process of setting the parameters required to achieve online. Parameter tuning of the main task is to determine K (P), A (I), B (D) and sampling period Timer, the ratio of coefficient K (P) increases, so that the action servo drive system is sensitive, in response to speed up, and had caused the General Assembly oscillation to regulate the hours lengthened; integral coefficients A (I) increases, the system can eliminate the steady-state error, but the stability of decline; differential control of B (D) can improve the dynamic characteristics, so that to reduce the overshoot, shorten the adjustment tim
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