In order to further bring into play the project benefits, better serve the economic development of the Jiaodong region, and realize the grand strategy of strengthening the economy as soon as possible, carry out technical transformation of the original electrical equipment of Wangjing Pumping Station. Since the water supply in October 1989, after nearly 20 years of operation, the original electrical equipment of Wangjing Pumping Station has gradually exposed a series of technical problems that constrain the full benefits of the project.
High-voltage and low-voltage electrical equipment have hidden dangers that seriously endanger personal and equipment safety: high-voltage electrical equipment circuit breaker oil seal aging oil leakage, when the oil surface is lower than the allowable oil surface, the arc cannot be fully extinguished, and even the oil switch explodes; high-voltage equipment operation protection Some defects (no reliable grounding protection) high-voltage equipment does not have a live locking device, misuse of the user and equipment safety; low-voltage equipment can not guarantee safe operation.
The operation part indication is not obvious, there is no safety protection measure, the operator may have electric shock due to misoperation, and there is a lack of equipment operation monitoring and inspection. The specific performance is as follows: the electrical equipment has lower insulation performance, stripping, aging, and the oxidation of bare conductors causes its electrical conductivity to decrease, which makes the reliability, accuracy and rapidity of relay protection lower, and can not be accurate and correct. Elimination or even a large accident Electromechanical electrical protection device due to semiconductor aging, the relay setting value system is loose, can not be tightly combined and the range scale is fuzzy, can not guarantee the reliability of relay protection, and even cause short-term accidents and burn out the unit.
After nearly 20 years of operation, the thyristor excitation device can not accurately and timely overcome the vibration generated by the pulsed magnetic field during the starting process of the unit, causing damage to the motor; the impact of the host on the power quality of the power grid under the condition of “under excitation†(by The stable capacitive load jumps into an inductive load: that is, the transmission of reactive power to the grid becomes the reactive power of the absorption grid, and the characteristics of the synchronous motor are lost. The conventional thyristor excitation device has no reliable out-of-step protection device, and even loses the stability of the synchronous motor. Operating conditions.
The auxiliary machine system cannot meet the requirements of the main engine operation. For example, the gate opening and closing device cannot accurately open and close the gate in time and maintain the best performance. The refueling opening cannot be performed in time.
In view of the above-mentioned defects, the project benefits play a bottleneck and restrictive role. For this reason, the original electrical equipment is technically transformed, and the principle of “economic, practical, economical, and waste-free†is adhered to. Safety is always implemented during equipment renovation: “Safety first, prevention firstâ€
Pre-preparation work: According to the principle of saving the secondary equipment cable, adjust the position of the central equipment (radiation from the center to both sides) according to the principle of saving the cable of the secondary equipment, and pass the voltage transformer in the six kilovolt switch room. Reasonable arrangement of cabinets and communication cabinets can save cables.
In terms of the length of the cable, the cable orientation and the length plane position map are drawn according to the position of the indoor cabinet of each functional unit. Firstly, the cable tray, the preparation area, the upper bridge of each functional unit, the bridge position and the terminal block of the cable tray are arranged reasonably; the distances of the above distances are measured by the field; the remote room, the central control room and the low pressure zero point are respectively calculated. The length of the cable for control, measurement, protection, switching, communication, and video of each panel of kilovolt, I station, six kilovolt, ten kilovolt, substation, and water outlet is marked on the cable direction and length position map. It can make the messy cable simple and clear, and work in an orderly manner, avoiding unnecessary work and waste caused by leakage and heavy cable.
For the new electrical equipment, high-tech products and high technical content have been added. In particular, the introduction of industrial control computer monitoring technology requires a comprehensive application of various knowledge and skills in hardware and software. Computer monitoring technology and engineering control skills, basic software and system maintenance personnel; this should make full use of the existing staff talent team to recharge the staff; three batches of employees have been sent to Shanghai, Suzhou, Nanjing manufacturers to learn : Learn the basic knowledge of the manufacturer in the cabinet making and debugging, understand the outstanding advantages of the products, learn to use high-tech products to overcome the defects of the original electrical equipment, find out the correct operating principles and precautions for the new equipment, and understand the existence of the products. Insufficient; especially the employees who go to Nanjing must monitor and manage the main and auxiliary system, the ten-kV line from the components to the entire IPC, and continuously report and report the operating parameters and communicate with each other. System learning must be carried out and the computer must be mastered. Monitoring system design ideas, operational skills and faults Troubleshooting skills.
In the organization construction, the safety education of “safety first, prevention first†is carried out for all employees. The biggest hidden danger is paralysis, and the biggest saving is safety. Therefore, it is necessary to establish a strict and safe prevention mechanism to strengthen management and ensure safety. At the same time, a construction safety team will be set up, and a deputy director will be responsible for establishing a safety responsibility system, implementing it at various levels, and alerting the police; requiring each employee to pay attention to safety first. (Learning to learn about safe use of electricity and emergency care knowledge and then care about the safety of colleagues.
Take advantage of the talents and technical advantages of the staff of the station, and use the skills of each employee to build a technical skill for each employee, familiarize the technical backbone, master the drawings and conduct technical discussions, based on the electrical schematic diagram, the working principle diagram of the equipment, the relay protection action process, measurement, control, Protection, automation, and video surveillance separately lay the starting cables of the main and auxiliary equipment; check the current-carrying cross-section of the used cables, analyze the technical data provided by the factory, and have problems in the work process, and contact the factory in time. .
During the installation of new equipment, the bridges with multiple cables for cable laying have the characteristics of three-dimensional intersection and inter-layer crossing. Combine the position of the cable terminals in each panel: first the lower side, then the upper side, avoid crossing under the cabinet In the "D" type and "Ten" type position of the cable tray, the "Civilization Crossing Bridge" rule is formulated. The 3X3 angle steel is used to weld a bow type bridge, and the "bridge on the bridge" is taken straight, and the turn is "flat". "Bridge"; and make an agreement to first lay the cable that needs to be changed, secondly, then the front and the back, the first straight and the back, the same distance of the first thick and thin, the cable from the bridge into the cabinet below the cable below the line (using the lashing line crane Live) and then go to the edge of the bridge; finally, the crossover cable that is hard to avoid is placed in the straight section in the specific wiring of the cabinet cable. Firstly, the working principle of each cabinet is roughly understood, and then the measurement, control, protection, communication, signal acquisition, The circuit of the switch and video working process, the end of the cable takes into account the other end of the cable, forming a complete loop to facilitate the elimination of faults during operation; finally each unit as a small Installation and wiring, from the motor outlet cabinet to the local excitation cabinet to the pit, the water outlet, the remote unit LCU cabinet, the central control room, the public LCU cabinet, the public water and the auxiliary system, and finally to the video to form a complete unit Knowledge, skill structure system for installation, operation and maintenance.
In the wiring of the LCU of the main transformer protection screen, it starts from the differential protection, current quick-break, over-current, overload, light gas, heavy gas protection, action, signal circuit, and also the measurement, control, temperature loop, which is conducive to the operation. Signal, accident, and troubleshooting.
In the process of pairing, use the working principle of installation: each measurement, protection, action, signal, communication, video loop to line, through simulation test, panel debugging, unit commissioning (1, comparison flow chart and actual program list Ensure that each item appearing in the flow chart is in the actual program; second, check each branch, to ensure that the conditions of the transfer are consistent with the definition of the problem; choose a situation that generates the transfer and a case that does not transfer, Verify that the transfer is correct; Third, check each cycle, check whether each cycle sets the initial value of the used register or memory, and then see if the transfer address in the loop is correct. Computer monitoring system debugging (commonly available during debugging) Firstly debug the subroutine and the smaller purpose-specific block and function block, then debug the larger block and function block, and finally debug the whole system) successfully complete the electrical equipment installation task of the electrical equipment technical transformation of Wangjing pump station. The first step of the Jiaodong Yellow Water Transfer Project was completed. After the technical transformation of the electrical equipment of the Wangdong Pumping Station of the Jiaodong Water Transfer Bureau, the technology was built.
Through the specific construction process of the electrical equipment technical transformation of Wanglu Pumping Station of Jiaodong Water Transfer Bureau, the following experience can be summarized: By drawing accurate cable orientation and length plan, the cable can be saved to the utmost extent, and the working principle, measurement and control of the electrical system can be utilized. , protection, communication, signal acquisition, switching, video working process loop, the end of the cable takes into account the other end of the cable, forming a complete loop, which facilitates the elimination of faults during operation; finally, each unit as a The team will install and wire the wiring from the motor outlet cabinet to the local excitation cabinet to the pit, the water outlet, the remote unit LCU cabinet, the public LCU cabinet, the public water and the auxiliary system, and finally to the video to form a complete unit installation. The knowledge and skill structure of operation and overhaul can have a multiplier effect, save time and money, and play a certain role in promoting the Jiaodong water transfer project and the South-to-North Water Transfer Project. One 238
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