2 volumes 1st September Sept. Guangdong State of Water Conservancy and Hydropower Turbine Generators Overhaul and Periodic Overhaul Pan Jianzhong Construction Management Bureau of Feilaixia Water Control Project in Guangdong Province, Qingyuan, 5825, Guangdong Preface The overhaul is the overhaul adopted by most hydropower turbine units. In recent years, with the continuous use of computer monitoring in the general use of hydropower stations and the continuous improvement of technologies, some experts have proposed that large-scale hydroelectric generating units installed in the future should no longer perform regular maintenance.
And implement the state check. To reduce unit downtime and improve utilization. Play greater economic benefits. However, at present, the maintenance regulations for large-scale hydro-generating units formulated by China's hydropower industry do not provide for state-based maintenance. The turbine generator manufacturer also did not make specific requirements. From the development trend. As the turbine generator manufacturing technology is maturing. The monitoring methods are improving. Stand-alone capacity is gradual, large, and the level of automation continues to increase. Therefore, the conditions for the implementation of state maintenance have also become more mature.
2 Conditional maintenance needs to meet the conditions for the so-called conditional overhaul of the so-called hydro-generator unit is the use of computer monitoring expert system to conduct a comprehensive record of monitoring and analysis of the operation and parameters of the hydro-generator unit. When abnormal operation of the equipment is found, judge or diagnose scientifically. And provide reliable reports. As a safety and stability of the overhaul operation of the hydro-generator unit. It is necessary to carry out conditional overhaul of the hydro-generator unit. Must have the following conditions, 1 computer monitoring expert system must have high reliability and security, powerful enough function and capacity, can not rely on the only computer monitoring system errors lead to damage to the safe and stable operation of the unit. First, the software required by the computer monitoring expert system is required to meet at least these basic requirements.
3 The computer processes the acquired signal faster. The safety-demanding computer that can meet the unit's accident situation 1 must have comprehensive judgment and analysis capabilities, and can correctly judge and analyze the collected signals.
6 The computer has a self-learning self-diagnosis function, and false-reporting and omissions do not occur due to the passage of time and the accumulation of data.
2.2 All sensing elements of the computer must be very reliable and the detected data is real. Important parts to configure the dual automated sensor components. Even if an automated sensing element fails, the computer monitoring expert system can perform accurate judgment and processing without affecting the safe operation of the unit. 23 The relevant standards and specifications for status overhaul are formulated, and it is necessary to realize the condition overhaul of the hydro-generator unit. Risks, because the planned maintenance has been carried out for many years if the implementation of state maintenance is not as expected, due to various factors, may have many unexpected consequences. Therefore, there must be a strict standard for computer monitoring expert systems. The practicality and operability must be strong, can provide guarantee for the safe operation of the hydropower generating units, or the premise that the state inspection will lose its sense of economic benefits is to ensure safety and safety requirements for safety and security. Many hydropower plants are currently unable to meet the requirements of state-based overhaul maintenance. There is still an imperfect function of the crew computer monitoring system. The automation components are not very reliable, and the design margin of the surface cooler is not sufficient for defects such as oil leakage of the combined bearing. If the manufacturer does not improve the progress. The state-of-management and regular maintenance of the generator set are indispensable. Since the commissioning of the generator set, the unit has carried out several temporary overhauls, and has carried out regular maintenance over a year in conjunction with the unit maintenance manual provided by the Austrian company Ilin.
3 Advantages of regular overhaul The regular overhaul system implemented by most hydropower stations is scientific and scientific. It is the accumulation of a large number of unit operation data. After careful analysis by the experts and summary, and according to the failure of the unit operation. The time interval determines the overhaul period. Generally speaking. Turbine generators are arranged to be overhauled during the dry season. As far as possible, the loss of power generation is reduced to a minimum, and the number of hours that the unit can be used is lost. For the power grid, there is enough spare capacity. Part of the unit overhaul is entirely possible. And in the dry season, the turbine unit was overhauled, and the faults and defects of the unit were handled well. This can fully ensure that the unit generates more electricity during the wet period. On the other hand, due to the adequacy of time schedules for regular maintenance, various considerations are more comprehensive and it is possible to deal with the defects of hydraulic turbine generator sets that are not easily monitored. For example, the degree of cavitation wear, the mechanical connection bolts breakage, the damage of flow-through hydraulic structures, etc. If these deficiencies are not discovered until the wet season, they will be scheduled for maintenance. The loss of power generation is quite large. In the flood season of most of the hydropower stations, the crews should be made full of multiple generations, and minor faults and defects should be left to be reprocessed when the unit is overhauled during the dry season. Let turbine generators generate more electricity during the wet period. Less downtime, or no downtime, to achieve greater economic benefits.
Regular maintenance also enables the maintenance management work to be carried out in a planned and targeted manner. The damage level of the equipment being operated is often transferred to the following functions on page 32. 3.1 Control and Adjustment 3 Unit Start-up Control According to the specified load Open value. Stopped. Or the operator can start or stop the operation through the keyboard or mouse.
Above control. In addition to the computer-based adjustment function, for some important functions, it also reserves the regular manual operating system as a backup. 3.2 Operational status parameters monitoring The entire station electromechanical equipment operating status parameters are automatically monitored by the microcomputer unit. Store and form various types of curve running log reports for display and automatic printing. Alarms shall be provided for over-limit parameters. 3.3 All types of microcomputer protection The entire station's various types of electrical protection and water machine fault and accident protection shall be implemented by each microcomputer protection unit and be divided into main protection and backup protection settings. In the event of a protective action or accident, a corresponding acoustic signal will be emitted. The text alarm window is automatically launched on the screen.
3.4 The event sequence records the operation of the main electromechanical equipment. protection. The accidental fault status changes are recorded in sequence, with daily time in the order of the actions. Minutes seconds. Millisecond mark for post-mortem and accident analysis, 3.5 data query and fault self-diagnosis all operation data protection actions and accidents. Fault alarm information can be stored for one year. Each control unit of the system has its own important components and communication with each other. Jsiiiivriimnm.5,1.iYfftsftL 3.6 Other management and statistical functions Other management and statistical functions include system operation password management functions; automatic counting of the number of hours of operation of the main equipment operation hours. The number of accidents and failures, and the establishment of equipment operating files; storage relay protection settings; provide operational and operational guidance.
3.7 Communication and Remote Station The computer at the station level has a communication interface that can communicate with a higher-level dispatcher or other computer system to achieve remote monitoring.
So far, the stomach computer monitoring system has been practically applied to Chaoxi County Caoxi River, hydropower station 2.2k, K Qingying City Yinying Yinlong Station Yinlong Hydropower Station 3 Father 5000 Yan 0 Xinxing County Shuizhong 35 Substation Dongguan City Canal cane Village pump station to 185 research 0, etc. more than a dozen power stations such as substation pump station. Because of its stable performance. Safe and reliable, high degree of automation, reduce staff efficiency. Easy to operate. Wiring is simple, reducing maintenance workload greatly improves the operational efficiency of the power station. Such as emerging county Shuizhong substation. In 1998, the evaluation device was used for updating. Only since August 1999, due to the high degree of automation. Reduced semi-running staff.
Poor management costs 10,000 yuan; due to quick installation. Reduce power outage time by 12 days. More than 36,000 electricity transmissions were added to increase production value by 250,000 yuan. Usually almost maintenance-free and overhaul. Compare with conventional equipment. Run for 9 months. Save repair time 8 days, more power 24 9 to find. , increase production pit 168,000 yuan. The grid microcomputer monitoring device is less than 300,000 yuan. Not all costs have been recovered in half a year. The long-term benefits of micro-computer monitoring systems are considerable.
4 Prospects China's water resources are very rich. However, the overall level of development is still relatively low. Moreover, the hydropower stations that have already been built are especially small hydropower stations, and their technical equipment and operation management levels are still lagging behind. The degree of automation is low and it is difficult to adapt to the requirements of safe and economical transportation of modern power systems. Urgent need for technological transformation to improve its automation level. Technical renovation of new and old projects. It is imperative to use a computer monitoring system for operation management. The Jaguars computer monitoring system compared with conventional equipment. With the overall indicators advanced to achieve the advanced indicators of the same type of equipment abroad, the unit structure is concise. The protection unit is ultra-miniaturized, highly reliable, network specifications, real-time performance, and flexible host computer configuration. Friendly interface. Software module features such as full-featured. And the price is very low. Especially for small hydropower plants. Targeted. The equipment is simple. Easy operation and maintenance, high level of automation.
In the actual operation, it has high technological advancement and safety and reliability, which is very suitable for China's national conditions. Can be pre-made. In the next few years. The computer monitoring system will be fully applied and the degree of modernization and economic efficiency of small hydropower will also be greatly improved. It will have an impact on China’s economic development and technological progress.
The editor of the responsibility Zeng Weiyue is not easy to grasp on page 28, and regular inspections can be handled in a targeted manner.
4 Condition maintenance and regular maintenance The maintenance of the hydro-generator unit is to better display its economic benefits. The state inspection with the maintenance of the discussion period is to check the condition of the turbine generator set for conditional overhaul. It's just a theoretical discussion. There is no unified standard. It is unrealistic to cancel the periodical overhaul at present. The conditions for the full implementation of state-of-the-art overhaul for large-scale hydro-generator units across the country are not yet fully realized. There are various conditions for the implementation of state maintenance. At present, a considerable number of hydroelectric generator units have been equipped with computer monitoring systems, but the operational reliability has not reached the design requirements. Deadlocks and data loss occur from time to time. Without intelligent computer applications in hydropower stations, it is possible to control the unit. However, the correct judgment and analysis of the unit operating status can only stay at a fixed level. In particular, the sensing elements configured for the hydropower generating units are not reliable and have poor ability to adapt to the environment. The failure rate is high. Severely affecting the safe operation of the unit, there is no way to discuss it without first solving these problems. State-of-the-art maintenance and periodical overhaul There is an economy and technology that is easier to implement than a small unit. Because the impact of the start and stop of small units on the power grid is smaller than that of large units. The accident losses are relatively small; large units can be combined with state-of-the-art repairs and regular maintenance, and conditional hydropower plants have required hydropower generators to meet the requirements of the state of affairs. The status of the maintenance can be tested. When some failure factors cannot be completely determined, the combination of condition inspection and periodic inspections must be implemented. However, the number of periodic inspections can be reduced and the periodic inspection period can be extended.
5 Concluding Remarks With the continuous advancement of computer technology, the manufacturing technology of hydro-generator sets and auxiliary equipment is continuously improving. Especially the improvement of automation component manufacturing technology. Provide scientific basis for state maintenance and periodic overhaul of hydro-generator units and development of corresponding standards and regulations. Zeng Weiyue, editor of maintenance manuals for Feilaixia unit
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