Experience of Technical Transformation of Electrical Equipment of Wangye Pumping Station in Jiaodong Water Transfer Bureau
To further give play to the engineering benefits, better serve the economic development of the Jiaodong region, realize the grand strategy of economically strengthening the province as soon as possible, and carry out technological transformation of the original electrical equipment of Wangye Pumping Station. Since the water was turned on in October 1989, after nearly two decades of operation, the original electrical equipment of the Wangye Pumping Station gradually exposed a series of technical problems that restricted the full benefit of the project. High-voltage and low-voltage electrical equipment have hidden dangers that seriously endanger the safety of people and equipment: oil leakage of high-voltage electrical equipment circuit breaker oil seal aging, when the oil level is lower than the allowable oil level, the arc can not be fully extinguished, or even cause the oil switch explosion; high-voltage equipment operation protection Part of the defects (no reliable grounding protection) High-voltage equipment does not have a live locking device, misuse and endanger personal and equipment safety; Low-pressure equipment can not guarantee safe operation. The operator's instructions are not obvious, there is no safety protection measure, the operator may operate the electric shock by mistake, and there is a lack of equipment operation monitoring and inspection links. The specific performance is as follows: electrical equipment, insulation performance is reduced, paint stripping, serious aging, exposed conductive oxides caused by the decline in its electrical conductivity, so that relay protection reliability, accuracy, rapidity is reduced, can not be accurate so that the operation of small faults can not be timely Exclusion, even catastrophic accidents Electromechanical electrical protection devices Due to aging of semiconductors, the relay setting system is loose, cannot be tightly integrated, and the range scale is vague. The reliability of relay protection cannot be ensured, and short-term accidents can cause severe damage to the unit. After nearly two decades of operation, the thyristor excitation device cannot accurately and timely overcome the vibration generated by the pulsating magnetic field during the start-up of the unit, causing damage to the motor; and the host's impact on the power supply quality of the power grid under the “under-excited†condition. The stable capacitive load jumps to inductive load: the reactive power transferred to the grid becomes reactive power absorbed by the grid and the characteristics of the synchronous motor are lost. The traditional thyristor excitation device has no reliable out-of-step protection device and even loses the stability of the synchronous motor. The conditions of the operation. Auxiliary system can not meet the host operating requirements. For example, the gate opening and closing device cannot open and close the gate accurately and maintain the best performance. The charge opening cannot be performed in time. In view of the above-mentioned defects, which play a role of bottlenecks and restrictions on the project's effectiveness, the company has carried out technological transformation of the original electrical equipment and adhered to the principle of “economical, practical, strict conservation, and elimination of wasteâ€. Safety has always been implemented during the transformation of equipment: "Safety first, prevention first" Pre-preparation work: According to the principle of saving secondary equipment cables, adjust the position of the center equipment (radiation from the center to both sides) and pass the voltage transformer in the 6,000-volt switch room. Reasonable layout of cabinets and communication cabinets can save cables. In terms of the length of the cable, drawing the direction of the cable and the length of the plane according to the position of the cabinet in each functional unit. Firstly, reasonable layout of the cable trays, the preparation area, the position of each functional unit disk cabinet on the bridge, the exit bridge, and the connection terminal at the cable tray; through the field measurement of the above distances; calculate the remote control room, the central control room, and the low voltage zero point respectively. The lengths of cables for control, measurement, protection, switching, communication, and video of the KV, I station, 6,000V, 10,000V, substation, and water outlet cabinets are marked on the cable trend and length maps. It can make the messy cables clear and simple, and work in an orderly way to avoid unnecessary work loss and waste caused by leakage and re-entry of cables. In response to the new electrical equipment, high-tech products and high technical content have been added. In particular, industrial control computer monitoring technology has been introduced. It requires a comprehensive application of various knowledge and skills in hardware and software. Computer monitoring technology and engineering control skills, operation of basic software and system maintenance personnel; this will make full use of the existing staff talent team, charging staff to fuel; has sent three batches of workers to Shanghai, Suzhou, Nanjing manufacturers to learn : Learn the basic knowledge of manufacturers in the panel making, debugging, etc., understand the outstanding advantages of the product, learn to use high-tech products to overcome the defects of the original electrical equipment, find out the correct operating points and precautions for the new equipment manufacturers, understand the existence of the product Insufficient; especially the employees who go to Nanjing must monitor and manage the main and auxiliary systems and the 10-kilovolt line in real time from the components to the entire industrial control machine, continuously report and report operating parameters and communicate with each other, and must learn the system and master the computer. Monitoring system design ideas, operating skills and failures Troubleshooting skills. In the construction of the organization, all employees are given the safety education of "safety first, prevention first". The biggest hidden danger is paralysis, and the biggest saving is safety. Therefore, we must formulate a strict safety prevention mechanism to strengthen management and ensure safety. At the same time, a construction safety team is established. A deputy director is responsible for the establishment of a safety responsibility system, which is implemented at all levels. The alarm bells ring and each employee is required to pay attention to their safety first. (The study of safety electricity and emergency rescue knowledge is a joint defense mechanism that focuses on the safety of colleagues. Make use of the technical advantages of the station's staff and talents, and take advantage of the skills of each employee. Organize the technical backbone to familiarize with, master the drawings and conduct technical discussions, based on the electrical schematics, equipment working principle diagrams, relay protection action process, measurement, control, Protection, automation, and video surveillance respectively lay the initial cables for the main and auxiliary equipment; check the current-carrying sections of the used cables, analyze the technical data provided by the manufacturer, and identify problems during the work process; contact the factory in time. . During the installation of new equipment, the cable bridges that are used for cable runs have the characteristics of three-dimensional intersections and cross-layers. In combination with the positions of the cable terminals in each cabinet, the following principles must be followed to avoid crossover under the cabinet. In the cable bridge "D" type, "10" type position to establish "civilized bridge" provisions, the use of 3X3 angle welded a bow bridge, go straight "bridge bridge", turn the "flat "Bridge"; and agreed to first shop need to change the cable, followed by the first far behind, first straight back bend, the same distance from the first rough, after the cable from the bridge into the cabinet under the cable to the floor (using the wire to hang Live) and then go to the edge of the bridge; finally it is difficult to avoid the crossover cable in the straight section in the cabinet cable specific wiring, first a general understanding of the working principle of each cabinet, followed by the use of measurement, control, protection, communications, signal acquisition, The circuit of the switching and video working process, this end of the connecting 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 is a small Installation and wiring, from the motor outlet cabinet to the local excitation cabinet to the pit, the outlet chamber, the remote control 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 Installation, operation and maintenance of knowledge and skills structure system. In the main transformer protection screen LCU wiring, from the differential protection, current fast break, over current, overload, light gas, heavy gas protection, action, signal loop start, and measurement, control, temperature loop, conducive to the operation of the hair Troubleshooting of signals, accidents, and failures. During the alignment process, use the working principle of the installation: each measurement, protection, movement, signal, communication, video loop to carry out the line, through the simulation test, panel debugging, unit debugging (1, the comparison flowchart and the actual program list Ensure that every item that appears in the flow chart is in the actual program; Second, check each branch, to ensure that the conditions for the transfer are consistent with the definition of the problem; choose a case that generates a transfer and a case that does not transfer, Verify the transfer is correct; Third, check each cycle, check each cycle whether the initial value of the register or memory used, look at the transfer of the address in the loop is correct) Computer monitoring system debugging (General debugging can First debug the subroutine and the smaller purposed program and function block, then debug the larger program segment and function block, and finally debug the whole system) Successfully complete the electrical equipment installation task of the technical transformation of the electrical equipment of Wangye Pumping Station. The first step of the Jiaodong Yellow River Water Diversion Project was completed after the technical transformation of the electrical equipment of the Jiaodong Water Transfer Bureau Wangye Pumping Station. Management system to achieve a fully computerized, computerized data sorting operation, laid the foundation for information technology dispatch center of the province. Through the specific construction process of the technical transformation of the electrical equipment of the Wangye Pumping Station of the Jiaodong Water Transfer Bureau, the following experience can be summed up: By drawing an accurate cable orientation and length plan, the cable can be saved to the maximum extent, and the working principle, measurement and control of the electrical system can be utilized. , protection, communication, signal acquisition, switching, video work process circuit, the end of the cable taking into account the other end of the cable, forming a complete loop, to facilitate the elimination of faults during operation; the last to each unit as a The team installed the wiring, from the motor outlet cabinet to the local excitation cabinet to the pit, the outlet chamber, the remote control unit LCU cabinet, the public LCU cabinet, the public water and auxiliary engine system, and finally to the video to form a complete unit installation, The knowledge and skill structure of operation and maintenance can play a multiplier role, save time and money, and play a role in promoting the construction of the Jiaodong Water Transfer Project and the South-to-North Water Transfer Project. 238
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