Overview The old plant of Hongyi Electric Heating Co., Ltd. was founded in May 1967. On August 26, 1970, the first phase of the power plant was put into production and put into production. Acer Electric Heating Co., Ltd. currently owns 8 boilers, with a total capacity of 2220 tons/hour, 8 generators, a total capacity of 452 MW, and 3 turbine blowers, with a total capacity of 12,581 cubic meters per minute, and TRT residual pressure power generation. There are 2 aircrafts with a total capacity of 10.5 megawatts, which is the main energy power center of Jiuquan (Group) Corporation and the largest power plant of Jiajia Power Grid. The electrical equipments of the old factory of Hongye Electric Heating Co., Ltd. were all put into production in the 70's and 90's. In recent years, all types of switches have been transformed to different degrees with the electrical equipment, but the cabinets of high-voltage equipment still use the old ones. High-voltage cabinets, at present, all the electrical switchgears of the old factory do not have the five-prevention function of electrical anti-misoperation devices, which does not meet the requirements for the safety of power plants connected to the grid. With the continuous advancement of science and technology and the continuous improvement of people’s reliability requirements for power supply equipment, the operational safety requirements of power systems for electrical equipment have been further improved. At present, the power system has stipulated clearly that power plant electrical equipment cabinets must have The “five preventions†function is allowed to be integrated into the power grid. The evaluation of the safety of the grid-connected power system and the twenty-five counter-accident measures also clearly stipulate that there is no “five-prevention†for the electrical equipment and the power system must not be connected to the grid. In the electric power system, the misoperation caused by the failure of the “five-defense†function of the electrical equipment is the biggest disaster in the power industry. It directly affects the safe operation of the power grid and the normal power supply produced by the Jiugang Company, even causing severe equipment damage. , increase accidents, and cause personal injury or death. Doing a good job in preventing major accidents in power production is an important condition for guaranteeing the safe and stable operation of the power system. It is a common task for all units such as manufacturing, design, installation, commissioning, and production. Therefore, it is imperative to renovate and improve the five defenses for preventing misoperation of electrical equipment in thermal power plants as soon as possible. Five Preventions “The function achieved by the locking device is one of the important and important electrical equipments of the power plant. It is an important technical safeguard measure to effectively prevent electricians from entering the gap and misoperation. It is to ensure the safe production and safety of the power system. One of the important means of operation is that the anti-misoperation device should be able to achieve the following five functions: to prevent misclassification and to prevent accidental closing of circuit breakers, to prevent disconnection and disconnection of switches with load, and to prevent live connection (closed) grounding lines (knife switches); To prevent grounding (knife switch) and circuit breaker (isolation switch); to this end, the “five-prevention†function of the microcomputer-based misoperation prevention device of the old plant electrical equipment must be reconstructed and perfected as soon as possible to ensure the safety of the power system and the company’s power supply. The reliability and economic operation of sex and power plant production create better economic benefits for Jiu Steel. Renovation plan Old factory all kinds of high-voltage switchgear five defenses “The equipment transformation and improvement require a lot of special construction equipment and materials, spare parts, the electrical maintenance personnel of the Hongwei Electric Heating Co., Ltd. do not have the construction qualification. In order to ensure the project construction quality, progress , And in full consideration of the shortage of equipment for the transformation of the Jiu Steel Company, it is planned to entrust professional manufacturers or professional construction units to the site for construction in the next year. According to the actual conditions of the operation of the high-voltage equipment in the old factory and various problems in the Northwest Power Grid, after careful communication and technical exchanges between the relevant technical personnel of the power plant and the Five Defence “equipment manufacturers, it was finally determined that all types of high-voltage switchgears for the old plant are equipped with five defenses. The scheme for improving and retrofitting the equipment is scheduled to be reconstructed and perfected in the next year during the scheduled inspection of electrical equipment so as to not affect the safety, stability and reliability of the entire Northwest Electric Power System and Jiuquan Steel's production and supply. This reformation consists of five defenses: “The locking device manufacturer is equipped with adequate safety work tools and safety protective devices that have passed national or provincial or ministerial quality inspection agencies; in order to prevent accidental boarding of outdoor electrified devices, it is fully enclosed (including mesh Temporary maintenance of the temporary fence; switch cabinet outlet side should be equipped with live display device, live display device should have a self-test function, and with the line side grounding knife gate interlock; anti-misoperation device power supply should be relay protection and control loop power supply Independent; When using computer monitoring system, remote and local operations should all have the function of preventing misoperation and blocking; when using computer to implement the function of preventing mis-lock, it must be approved by the relevant department of the unit, and approved by the competent director and filed before being put into operation. 4 Main Construction Contents Five anti-locking devices are installed on the harmonic, bus coupler switch and the knife gate. Five anti-locking devices are installed on it. 4 The main transformer 10KV switch, knife gate installed five anti-"locking device. In the 1-2 plant high-voltage transformer high and low side switch, knife gate installed five anti-"locking device. In the 1-2 plant high-voltage standby transformer high and low side switches, Knife on the installation of five anti-locking device. There are five anti-locking devices installed on the knife gate and the network point switch and the knife gate. An anti-lock device is installed on the power switch and the knife gate. Five anti-locking devices are installed on the gate and the knife gate. 5 The initial estimate of investment costs is responsible for installation and commissioning, and the relevant personnel of the power plant cooperate vigorously. Based on the full inquiry and the careful comparison of the same type of equipment within the company, the cost of ordering equipment: 800,000 yuan Installation and commissioning costs: 100,000 yuan Other expenses: 100,000 yuan Total: 1 million yuan 6 Conclusions Electric Heating Co., Ltd. Old factory high-voltage electrical equipment transformation and improvement of five defenses "locking function, can effectively prevent operator mistakenly into the live interval and mistaken pull, mistakenly caused by mistakes such as faulty knife and other accidents, so as to completely eliminate electrical The occurrence of equipment misoperation accidents and the resulting personal injury and death accidents ensure the safe, economical and stable operation of the power plant and the safe production of the Jiuquan Steel Corporation and the safe, stable and reliable operation of the entire Northwest Grid. 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