Through various tests, diagnostics are performed on operational equipment and new investment equipment to ensure that the power grid is safe, stable and economical. The use of computer-assisted power test and performance evaluation will effectively improve the efficiency and reliability of power overhaul and the accuracy of test data to facilitate the leadership of inquiries and work supervision.
[Keywords] USB interface; status overhaul; routine test; diagnostic test; reference cycle; initial value
I. Overview
(I) Status of power test diagnosis
Power maintenance business is an important part of power production, and power testing is one of the basics of maintenance business. Through various tests, the operating equipment and new investment equipment are diagnosed to ensure that the power grid is normal and safe to operate. However, there are still the following problems in the power test at this stage.
a. Informatization ignores the testing process
b. Failure to diagnose in time
c. Difficulties in generating test reports (2) Purpose and significance of the project research
a. Informatization ignores the testing process
b. Failure to diagnose in time
c. Difficulties in generating test reports (2) Purpose and significance of the project research
The purpose of project research is to regulate the work behavior of employees, reduce ineffective labor, reduce duplication of labor, improve work efficiency, improve work quality, and meet the requirements for equipment reliability, and realize the work flow of teams, workshops and workshops, and the reengineering of operational procedures. Production team work load. Provides an effective means for supervisors to supervise, instruct, and assess the inspection work, and to achieve the standardization, standardization, and information management of transport inspections.
II. Necessity of project research and analysis of market demand
(a) The necessity of project research
The test of electrical equipment plays a decisive role in the power system. It effectively guarantees the safe, stable, continuous and economical operation of the power system. It has served as an escort for the long-term and stable development of the power system and all walks of life. The necessity of studying this project is mainly reflected in the following aspects:
1. Adapt to the requirements of the new standards of team management and effectively reduce the burden on the team
2. Ensure the accuracy of on-site inspection data of electrical equipment and the timeliness of maintenance decisions
3, to meet the "state maintenance", the need for the production management system workflow
III. Overview of Domestic and Foreign Technology Research in Related Fields
The safe and stable operation of the power system is the most important task. To ensure the safe and stable operation of the system, the state of the equipment must first be ensured. Therefore, when the equipment completes the initial installation and commissioning, the equipment is in service, and there are defects in the equipment, various types of tests and tests are performed on the electric equipment to ensure that the equipment is in a normal condition. The important content of management and maintenance. As one of the most important contents of power equipment operation management and maintenance, the field test has particularity, its test content is many, the on-site operation is complicated, and the flow is numerous. The contradiction between the lack of growth of electric power test personnel and the rapid expansion of production tasks is particularly prominent. From the beginning of the test wiring, to the test operation, the recording of test data, the preparation of the test report, etc. – all manual operations, and the degree of automation is extremely low.
At present, some domestic test and test equipment manufacturers have developed electric test vehicles. However, the test vehicles are expensive and difficult to implement in a wide range, and the test projects have certain limitations. The test vehicles only control the test and test process and cannot be tested. The results are evaluated in real time in the field. Can not reach the purpose of timely detection, processing defects and "state maintenance" evaluation and decision-making.
IV. Project Plan Objectives and Main Research Contents
(I) Main objectives
1) to achieve on-site diagnosis: can use mobile devices (PDA or tablet computer), on-site diagnosis of test data in a timely manner, the comparison of test conditions knowledge base and equipment initial value, historical data directly to determine the condition of the equipment, in order to find faults in time, Overhaul equipment.
2) After the test data is entered at the site, the system automatically generates an experiment report based on the template.
3) Reducing the burden on the team: The power equipment test often uses a lot of time after the test, even with more workload than the test time to do the report, and also needs to check a lot of data during the diagnosis. The system will use information technology to reduce the level of human participation in report generation and diagnosis.
4) Directly import test data into production information system
(II) Research content and development environment
At present, most test equipments have a USB interface that is connected to a computer or have a small storage device on their own, enabling the interconnection of test equipment and computers. The field test results are directly imported into the field test real-time evaluation system. For devices that do not have this USB interface, contact the manufacturer of the device. The manufacturer of the test device may add this feature or the manufacturer may agree to develop its own interface technology.
Development and application research of on-site test and characteristic evaluation management system software for electrical equipment: According to "GB50150-2006 Electrical Installation Tests for Electrical Installations, Test Standards for Electrical Equipment," Sichuan Electric Technology 2008 (5) Test Procedures for Condition Maintenance of Power Transmission and Transformation Equipment. The power transmission and transformation equipment is classified according to different voltage levels and different equipments to realize the initial evaluation of field test data; and a historical test database of different equipments in different substations is established, and the test test results are compared horizontally with previous test test results (or initial values). Analysis to further diagnose the health status of power transmission equipment. If abnormal situation evaluation system automatically alarms, describe the defect situation. This helps the tester to judge the test results and eliminate the influence of external factors on the test results in a timely manner.
Export report of the test report: The electrical equipment field test and characteristic evaluation management system should be able to interconnect the test equipment and the evaluation system, and conduct real-time evaluation. After the evaluation is completed, the test report form of the standard format will be automatically produced. Reduce the artificially issued test report process and reduce the burden on team personnel.
LAN interconnection research: With the help of Internet, CDMA, ADSL and other technologies, the test site is interconnected with the LAN and state-owned maintenance assessment system of the provincial company, which can realize functions such as uploading data, data downloading, and monitoring the completion of site operations.
2.1 System Network Structure
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ü The system considers that the test site environment is complex. The diagnostic terminal system is designed around all applicable, easy-to-use, and simple. It tries to design according to the idea of ​​the industrial control system, reduces the input, reduces the interface switching, and can complete the input and diagnosis of field test data through the interface.
ü Through the centralized management of equipment data, one-point input of test data, automatic generation of test reports, and a large reduction in the power test period and the finishing time after the test. Reduce the burden on the team and improve work efficiency.
ü Through the "Test Procedure" built-in system, the experimental experience is converted into information identification code, template configuration and other means to achieve intelligent judgment of test data, longitudinal comparison of historical data, automatic generation of test reports. The system uses a large number of intelligent analysis techniques to allow the system to largely replace the human brain analysis process.
ü Test diagnosis depends on real historical data and initial value data. At the same time, the system has a large number of diagnostic rules built into the “test procedure†to avoid and reduce misjudgments caused by manual judgments and to make timely and accurate diagnosis.
ü After the field test data is entered, the test report can be automatically generated according to the template format, without the need for input or adjustment. You can also import test reports directly to other systems via the interface.
2.2 System Development Environment
The system is based on B/S+C/S structure design, adopts WEB development standard, development environment is visual C++6.0, and WEB access end uses ASP technology. For the experimental template, the Chinese table cell control is used; the data storage software is developed using sqlservrCE2.0.
2.3 System Function Architecture
2.3 System Function Architecture
According to the needs of power maintenance work, the system is mainly composed of configuration management, asset information, test plan management, test report management, and mobile diagnostic terminal. For a certain module, different responsibilities can be managed by different personnel.
2.4 System main functions
ü Coding management
Edit and manage the simple code that the system needs to use, such as: test professional: high pressure test, chemical test, other test; test nature: inspection, transfer test, routine test, diagnostic test, preventive test; voltage level: 220V 380V, 10KV, 35KV, 110KV, 220KV, 500KV
ü Diagnostic template management
Report Template Management: For test types and device type configurations, the report template uses a form similar to Excel. The data coordinates in the report template need to be filled in the diagnostic template. The test report template is both a report display format and a data entry format.
Data Template Configuration: Data templates are the basis for configuration of test data records, displays, and report formats. It is also the basis for the diagnosis of test data. The data template, as an independent configuration, does not bind positively to the test type and device type, but binds a specific data template to the device type.
Nameplate template management: Configuration of specific equipment types is the basis for the nameplate format in nameplate data entry and report data.
ü Test type configuration
The type of test refers to a certain type of test, and the number of test sets for the same test for different equipment may be different, and the test input parameters may be different. The test equipment used in the same test is the same.
The type of test configuration includes: test type coding, test type name, test instrument name, test data value sequence. The sequence of test data values ​​is the numerical name of the record of a certain type of test result. For example, the test data value sequence of the DC resistance test includes A0/Ab, B0/BC, C0/CA, and the unbalance ratio. The sequence of test data values ​​includes not only test results but also input parameters and calculated values. The test data value sequence is the basis of the template configuration.
ü Equipment type coding
The device type is the basis for the system to set the reference cycle, test template configuration, and so on.
ü Reference cycle configuration
The reference cycle is configured for the master device type and test type, and the reference cycle is configured for the inspection project and rational test project.
ü Asset Information Management Subsystem
Asset information management is to prepare basic data for experiments. Including the equipment location, model and other data maintenance.
ü Nameplate information
Record the nameplate information for each device. Nameplate information is mainly used for test reports.
ü Historical test data maintenance
The historical test data is entered for the purpose of archiving and diagnosis. If no detailed historical data is entered, the last inspection, routine test, and diagnostic test time must be determined. For planning purposes.
ü Asset data interface
Asset data is exported from the production system to avoid re-archiving files.
ü Test Plan Management Subsystem
It mainly includes: the formulation of inspection plans, the formulation of diagnostic test plans, the formulation of handover test plans, and the adjustment of test cycles.
ü Test report management subsystem
Mainly include: report generation, test report query, test data analysis
ü Mobile Diagnostic Subsystem
Mainly include: download test plan, test plan browsing, plan upload, nameplate data transcription, test data entry, test site diagnosis, equipment file query
V. Conclusions and recommendations
Due to the increasing number of electrical equipment in the power grid, the workload of test equipment for power transformation equipment has been continuously increasing, the number of production technicians is insufficient, and the management of the team has a wide range of contents. The problem of overtime and overload of staff in the production team has existed for a long time. In accordance with the traditional work mode for maintenance and management work, the maintenance work often occurs too long to generate experimental reports, processing equipment failure is not timely, work efficiency and quality is not high, can not be found in time to analyze the defects of the operating equipment, to the grid equipment, safe operation Hidden dangers, electrical equipment field test and characteristic evaluation management system can upload the test data directly to the computer, the test results are easy to save, easy to find, and realize paperless work site. At the same time, it can rapidly diagnose the health status of electrical equipment, detect the defects of the equipment in time, judge and analyze the cause of the abnormality, and deal with it in a timely manner to avoid unnecessary repeated blackouts. The application of the system for daily power maintenance work and management is convenient, fast, intuitive and more economical and feasible.
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