The power industry is an equipment, technology and capital-intensive industry. In order to achieve the goal of the lowest life cycle cost of power transmission and transformation engineering equipment and improve the reliability and economy of equipment.
In order to adapt to the rapid development of electric power production and construction, this paper discusses the equipment maintenance methods in equipment management of power transmission and transformation projects. How to learn from the existing maintenance theory and practice at home and abroad
Based on the development results of practice, combined with the self-exploration experience of the power industry and relying on scientific and technological progress, it is a project that power supply enterprises are looking forward to studying to choose a reasonable and efficient maintenance strategy for power transmission and transformation equipment.
Important topic.
Keywords: Power transmission and transformation equipment maintenance countermeasures
1 Problems existing in the maintenance of power engineering equipment in China
In recent years, due to fixed investment, domestic power supply enterprises
A large increase in the number of equipment, rapid growth, as well as enterprises due to
The number of maintenance personnel has not increased much to meet the needs of reducing staff and increasing efficiency.
At that time, due to the requirements of improving the reliability of power supply, many
It is difficult to maintain the equipment during power failure, so it is mainly based on regular maintenance.
The planned pre-repair system has gradually become unsuitable for existing enterprises.
Requirements. In addition, the improvement of equipment quality also makes the maintenance strategy
Minor changes are possible. In this case, domestic supply
Electric power enterprises have designed the equipment condition maintenance as a breakthrough.
Practice and exploration of improving standby maintenance strategy.
Equipment condition maintenance of domestic power supply enterprises is mainly beneficial.
Use the existing mature technical means and methods to run the equipment.
Condition monitoring, using online equipment of expert system.
The off-line test data are analyzed and comprehensively evaluated.
The running state of is the future running state of the equipment.
Forecast, in order to realize the extension and cancellation of equipment maintenance interval.
Improve the rationality of equipment maintenance and reduce the overall maintenance cost.
Purpose. The main technical means adopted is equipment online.
Detection and equipment condition evaluation technology, the former mainly
It is an important method for transformers, switches, capacitive devices and lightning arresters.
Real-time measurement of electrical and mechanical state parameters;
The latter is based on the analysis of historical and real-time data,
Using fuzzy mathematics, expert system, neural network and other technologies
Technology to evaluate and predict the state of the equipment, its implementation methods mainly include
It is embodied in the computer maintenance management system (CMMS).
2 Power transmission and transformation engineering equipment maintenance countermeasures
There are many countermeasures for equipment maintenance in power transmission and transformation projects.
It mainly includes the reliability evaluation of complex large-scale systems, advanced
Sensing technology, information acquisition and processing technology, interference suppression
Technology, pattern recognition technology, fault severity analysis, life
Life estimation and other fields. Among them, advanced sensing technology is used for
And the information processing technology of fault diagnosis.
Advanced sensors are the key to achieve predictive maintenance.
Important means is an enduring research hotspot. this is
Because the development of fault diagnosis technology depends on whether.
Get as much useful information as possible, which is very important for data processing and
The basis of diagnosis decision. In order to improve the level of fault diagnosis,
The research of various new sensors has become a hot spot in the power industry.
Hot spots. Originally used in military sensing technology, there is also one.
Transplanted to the condition monitoring of power equipment. United States of America
The electric power research institute has developed a direct measuring and analyzing oil.
Semiconductor sensor for gas can be directly measured online.
Four kinds of gases in oil are analyzed and their changing trends are monitored.
It has been applied in transformers in some power departments. next step
The work is to integrate the sensor for measuring micro-water with it.
Combined with load current measurement, the gas in oil is further studied.
Relationship between body and water content and load.
It is better to process the collected signals than to collect them.
The signal itself is difficult for signal processing and processing.
Marker: extracted from the background interference signal of the crowd in the scene.
Take useful signals; Judging the fault according to the measured signal.
Classification; Determine the severity of the fault to determine the equipment.
Whether to exit the operation.
In order to suppress the inevitable interference in field measurement, in addition to
In addition to the application of hardware filtering and digital filtering technology,
Recent research shows that wavelet transform technology can effectively filter.
In addition to steady-state signals (such as carriers often encountered in field tests)
Signal interference and noise interference), can put the useful signal
Extract from the interference several orders of magnitude stronger than the signal
Let's go The classification of fault signals is more difficult to study.
Theme. In the past, frequency spectrum was used to distinguish fault types.
There are great limitations. For many different types of reasons
Part or even most of the spectrum of the barrier signal is usually heavy.
Overlap, frequency domain is difficult to distinguish. Research fault
"Fingerprint feature" and its extraction and identification.
Therefore, it becomes an important part of fault diagnosis research.
Branches. The fault classification methods being studied are: neural network
Network, expert system, wavelet analysis, fractal dimension analysis, etc.
3 Power transmission and transformation engineering equipment strategy.
(1) Development-based maintenance needs concept updating.
Due to the will of the chief executives of most power supply enterprises in China,
The level of chief engineer often affects the development and investment of technology.
The exploration and application of new technologies are extremely unbalanced, left
On-line detection equipment is specially installed under the route of "Shanghai University" for study and exploration.
The influence of correct thinking on the implementation of condition maintenance of electrical equipment
I don't recognize the online technology and equipment, but I still hold the operating rules.
Implement regular maintenance. At the same time, due to online detection
Companies, research institutes or universities that research and manufacture equipment,
It is still at the research level, and the molding technology is not yet available.
Confirmed, reliable, abundant and cheap equipment is not available yet.
It can be introduced that the electrical equipment of the power supply company is fully implemented.
Conditional maintenance of does not have conditions. Therefore, the status check
On the basis of analyzing the current professional laws and regulations,
Combined with the current situation of equipment, a set of reliable, efficient and humanized system is designed.
A guiding document for concepts. Not only to ensure professional regulations
Implementation of technical conditions, standards, processes, etc. , but also set up.
The "regular regulation" of standby maintenance has been gradually reformed.
(2) To carry out condition-based maintenance, it is necessary to strengthen management and integration.
Consider the economy
To carry out condition-based maintenance, leaders should first pay attention to it.
On the basis of scientific management, leaders should dare to undertake technology.
Responsibility, establishing responsibility, planning, organization and coordination.
And guide the work of the leading group for condition maintenance; coordinate
Transformation, distribution, maintenance, relay protection, testing and other stages.
Division of labor, cooperation, convergence and implementation of professional departments.
Every specific job.
Install on-line detection equipment for 220kV transformer.
Power stations often cost 400 thousand to 500 thousand, like Handan power supply company
The number of substations and equipment owned shall be inspected online.
Testing will cost more than 20 million yuan, and the testing equipment itself
The operation reliability of is affected by components and communication technology.
Ring, also has considerable instability, self-maintenance.
The cost is not low, and the purpose of reducing staff and increasing efficiency cannot be achieved.
(3) The implementation of condition-based maintenance needs to consider advanced technology.
And maturity
Condition monitoring technology and condition diagnosis of power equipment
Technology, condition maintenance technology, etc. , is constantly.
In the process of perfection and development, a few are conducive to timely,
Various means to accurately understand the condition of the equipment, whether it is
On-line, off-line, electrical and non-electrical methods
Worth considering.
Parameters and personnel monitored by various old and new means
There is no relationship between equipment strength and remaining life that scientists are most concerned about.
one by one
Correspondence. And make full use of expert experience and personnel.
The expert system established by engineering intelligence will be very beneficial for comparison.
In order to make a correct comprehensive diagnosis and analysis, so as to carry out the test, the
Repair, and exposed in the experiment and maintenance engineering.
The new situation has enriched the experience and improved the expert system.
At present, the diagnosis of equipment status is mainly based on
Statistical analysis of a large number of data. Years of experiments,
Operation and maintenance data, abnormal equipment and accident records.
Repeated calls, comparative analysis, etc. With the development of computer technology
The development of artificial intelligence technology has formed equipment diagnosis.
Expert system based on. Standardization of equipment management,
Apply programming and data integrity to guide the inspection.
Practice, comprehensive judgment with expert system, not only reduces
Less manpower, less mistakes, because we summed up the big
The amount of expert knowledge and the corresponding relevant regulations and standards,
At the same time, fuzzy mathematics, artificial neural network, wavelet analysis
Analysis, genetic algorithm diagnosis and other technologies are applied to power equipment.
In insulation diagnosis, the accuracy and speed of diagnosis are very high.
Quick, the diagnosis process is closer to the scientific thinking process of human beings.
(4) The implementation of condition-based maintenance needs to improve personnel quality.
Condition-based maintenance involves a wide range of professions and needs.
Professionals work together. Especially large substations.
Equipment maintenance and preventive testing require a large number of professionals.
Participation of members. From the characteristics and changes of substation maintenance work
Electrical maintenance personnel must be full-time personnel to ensure replacement.
The quality of electrical maintenance needs high-quality inspection.
Repair the talent team. At the same time, with the change of high voltage level
Increase of work stations, live working and state maintenance.
Implementation, etc. , put forward higher requirements for the quality of personnel.
Therefore, it is urgent to improve the comprehensive quality of full-time staff.
refer to
Jessica Fong Ching. Condition-based maintenance strategy for power transmission and transformation equipment. Sichuan(Province)
Electric power technology, 2008/02.
[2] Ma Minghuan. Research on Condition-based Maintenance Strategy of Power Transmission and Transformation Equipment
Please. Jilin Electric Power, 2008/06.
[3] Power transmission and transformation equipment: development will continue, and there are some problems.
Urgent attention. Han Wei. Electric Power Equipment, 2008/L 1.
4 Guo Yunpeng. Maintenance strategy of power transmission and transformation equipment. Eastern China
Electric power, 2006/ 12.