In view of the shortcomings of the planned maintenance system, our company actively adopts state maintenance. Through careful experience at home and abroad, after careful analysis, we can get the inherent rules of state maintenance. We can summarize the state of electrical equipment in power plants. It is the four steps of power plant evaluation, basic management work, basic technical work, and implementation and improvement of state maintenance. In order to implement condition maintenance, three major systems are required: equipment detection and diagnosis system, which includes a large online monitoring and diagnosis system and a portable monitoring diagnostic instrument. By monitoring and analyzing the operating status of the equipment, the diagnosis result of the fault is finally obtained; The maintenance decision system, which helps managers select maintenance solutions in the event of a failure, supports maintenance decisions by evaluating maintenance costs and benefits, and an integrated equipment management system that manages the dynamic, static, and maintenance processes of the equipment.
Condition maintenance can be implemented in the following basic steps:
1. Do basic technical work, collect basic data, and improve original data.
Record the site data with modern information management methods. Collect real-time status data of equipment, strengthen regular testing, and accumulate test data. Form the original data, use the data, data, and regular comprehensive analysis to determine the state of the equipment, from which problems can be found. Make the inspection more targeted. The specific practices for data collection are as follows:
(1) The technical parameters of the whole plant and the design rules of the manufacturer shall be classified into different categories, and the data shall be entered into the computer according to the equipment account method;
(2) Establish an existing spare parts database for the equipment;
(3) Realize the computer monitoring system of the power station, selectively collect some real-time data from the site, analyze and organize through continuous accumulation and processing, and establish a data information database;
(4) Establish a histogram of the voltage, current, temperature, vibration, pressure, flow and other parameters indicating the operating state of the equipment, and a curve of the change trend;
(5) Conduct regular analysis and make conclusions to determine whether the equipment is operating normally.
2. Improve equipment condition monitoring system and strengthen the optimization of maintenance plans for major electrical equipment
The state evaluation of the generator set mainly refers to the equipment such as generators, steam turbines, and bearing bushes. The monitoring of the generator is mainly the air gap, roundness, structural changes and wire rod vibration, etc., to evaluate whether there are magnetic pole separation, circuit imbalance and open circuit. The monitoring of the steam turbine can be based on the rule that the control period depends mainly on the length of the blade cavitation repair welding time, to determine the degree of cavitation of the blade and to formulate relevant plans. The status detection of the generator set, the power plant can be configured according to the equipment of the unit, and in accordance with the actual operating experience of the past, it can sum up the relatively fixed failure mode and the response table of the consequences. If the generator is short-circuited between the turns, the cause may be insulation aging, which may cause the generator to stop and no power output. If the exciter is unable to provide excitation current, it may be caused by carbon brush wear. If the temperature of the stator coil is too high, the load may be too large or the cooler may malfunction. Only by analyzing and summarizing various situations, can we logically analyze the faults of the generator set and develop a scientific and reasonable maintenance plan.
The evaluation and testing of the transformer can be based on visual inspection, maintenance records, production operations, historical problems, and different state parameters of the transformer at various times, combined with the latest technical means to determine the operating state of the transformer. The contents of the evaluation generally include: noise, overload, oil temperature, short circuit condition, sealing of the body casing and accessories, operation of the cooler, switch, oil pump, etc., and the state of the pressure change is determined by various tests.
3. Apply statistical data to predict device status.
First, find out the link between the statistics and the unit status parameters. We conducted statistical analysis on the number of hours of operation, power generation, and number of shutdowns. We found that although some equipments have been in service, the accumulated hours of operation are less than those of other equipment of the same type, so the overhaul period of the equipment is appropriately extended. Some equipments, although not in the overhaul cycle, found some major defects to be dealt with in a timely manner. Due to the use of this method for prediction, each time before the minor repair, the corresponding technical preparation work was completed, saving maintenance time.
4. Strengthen equipment maintenance and repair, and eliminate equipment defects in time.
The maintenance and repair work of the equipment has an important impact on the operation status of the equipment, such as the treatment of turbine oil, the filling of lubricating oil, the rotation of equipment, and even the cleaning work of equipment soot blowing, and each item should not be ignored. Defects in the equipment should be eliminated in time to achieve large defects, but small defects are not working. Make sure the device is healthy.
Condition maintenance can be implemented in the following basic steps:
1. Do basic technical work, collect basic data, and improve original data.
Record the site data with modern information management methods. Collect real-time status data of equipment, strengthen regular testing, and accumulate test data. Form the original data, use the data, data, and regular comprehensive analysis to determine the state of the equipment, from which problems can be found. Make the inspection more targeted. The specific practices for data collection are as follows:
(1) The technical parameters of the whole plant and the design rules of the manufacturer shall be classified into different categories, and the data shall be entered into the computer according to the equipment account method;
(2) Establish an existing spare parts database for the equipment;
(3) Realize the computer monitoring system of the power station, selectively collect some real-time data from the site, analyze and organize through continuous accumulation and processing, and establish a data information database;
(4) Establish a histogram of the voltage, current, temperature, vibration, pressure, flow and other parameters indicating the operating state of the equipment, and a curve of the change trend;
(5) Conduct regular analysis and make conclusions to determine whether the equipment is operating normally.
2. Improve equipment condition monitoring system and strengthen the optimization of maintenance plans for major electrical equipment
The state evaluation of the generator set mainly refers to the equipment such as generators, steam turbines, and bearing bushes. The monitoring of the generator is mainly the air gap, roundness, structural changes and wire rod vibration, etc., to evaluate whether there are magnetic pole separation, circuit imbalance and open circuit. The monitoring of the steam turbine can be based on the rule that the control period depends mainly on the length of the blade cavitation repair welding time, to determine the degree of cavitation of the blade and to formulate relevant plans. The status detection of the generator set, the power plant can be configured according to the equipment of the unit, and in accordance with the actual operating experience of the past, it can sum up the relatively fixed failure mode and the response table of the consequences. If the generator is short-circuited between the turns, the cause may be insulation aging, which may cause the generator to stop and no power output. If the exciter is unable to provide excitation current, it may be caused by carbon brush wear. If the temperature of the stator coil is too high, the load may be too large or the cooler may malfunction. Only by analyzing and summarizing various situations, can we logically analyze the faults of the generator set and develop a scientific and reasonable maintenance plan.
The evaluation and testing of the transformer can be based on visual inspection, maintenance records, production operations, historical problems, and different state parameters of the transformer at various times, combined with the latest technical means to determine the operating state of the transformer. The contents of the evaluation generally include: noise, overload, oil temperature, short circuit condition, sealing of the body casing and accessories, operation of the cooler, switch, oil pump, etc., and the state of the pressure change is determined by various tests.
3. Apply statistical data to predict device status.
First, find out the link between the statistics and the unit status parameters. We conducted statistical analysis on the number of hours of operation, power generation, and number of shutdowns. We found that although some equipments have been in service, the accumulated hours of operation are less than those of other equipment of the same type, so the overhaul period of the equipment is appropriately extended. Some equipments, although not in the overhaul cycle, found some major defects to be dealt with in a timely manner. Due to the use of this method for prediction, each time before the minor repair, the corresponding technical preparation work was completed, saving maintenance time.
4. Strengthen equipment maintenance and repair, and eliminate equipment defects in time.
The maintenance and repair work of the equipment has an important impact on the operation status of the equipment, such as the treatment of turbine oil, the filling of lubricating oil, the rotation of equipment, and even the cleaning work of equipment soot blowing, and each item should not be ignored. Defects in the equipment should be eliminated in time to achieve large defects, but small defects are not working. Make sure the device is healthy.
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Danyang Horse Optical Co., Ltd , https://www.dyhorseoptical.com