And analysis and other functions in wood to adapt to the power plant state inspection, and fault analysis and diagnosis needs. The main functional hardware structure and software design features of the system are introduced. 1 Introduction In recent years, the transformer-specific fault recorder for transformers developed for the unit operation and fault characteristics has been gradually promoted and applied in major power plants. However, the current crew wave recording device is mainly used for detection and recording of fault and abnormal operating conditions, and the function is relatively simple. In fact, without increasing the cost of hardware, with the help of the access volume information of the recording wave device, the application scope of the wave recording device can be expanded through reasonable design and functional configuration. For example, the dedicated recording direction of the unit operating state can be realized. Set the fault data recording and analysis of operational status monitoring, and the development of machine test data and divination and other functions in the direction of physical monitoring and analysis systems, so as to better meet the requirements of comprehensive automation development of power plants and to adapt to future equipment state overhaul optimization. Overhaul wave device based. He expanded and improved in functional configuration hardware and software design. This article will focus on the main features of the system design features and basic structure.
2 System Design Features New Types of Transformers 1. Microcomputer Supervisory Analysis System Fully Fully ± Also consider the requirements of on-site monitoring of unit shipment status and historical records and analysis. Simultaneously. The improvement of the integrity of records and the ugly network connectivity of online connections, remote online management, and system hardware platforms. Design features mainly reflect the following points.
2.1 Sets of operation status monitoring Fault recording and analysis and unit experiment recording and analysis In addition to the completion of routine fault data recording and analysis, the device also provides monitoring and analysis of key electrical parameters that reflect the running status of the machine. Students should include active reactive power monitoring, power factor monitoring, negative sequence current and voltage monitoring, and flow monitoring on each side of the transformer group. Wave monitoring. The frequency of the system frequency and generator power angle, measurement, and safety monitoring of machine yeast fermentation, etc. The relevant electrical parameters can be uploaded online to the higher-level dispatch department using remote transmission. In addition, in order to simplify the electrical experiment work of the unit and improve the reliability of the experimental record, the device also provides the automatic recording and analysis function of the electrical experiment process of the unit, and forms the relevant experimental report according to the experimental requirements.
2.2 The use of new data recording formats to ensure the integrity of the recorded information due to the unit's operating conditions and type and nature of the fault far more complex than the power grid, at the same time, there are many types of protection and safety automatic devices equipped with different principles, so the unit The integrity of the data record information puts forward higher requirements. 1 From the perspective of ensuring the completeness of the record information, the use of sampled value recording is undoubtedly the most comprehensive. However, it also brought about a large amount of data, and asked for high storage and communication requirements. In the traditional way of recording recorded wave data, only the short-term use of sampled value recording mode for the fault state process is usually used, and it is supplemented by the effective value recording mode. Short time, insufficient information recorded. In addition, in the design of the effective value recording unit, in addition to the substantial increase in the recording time of the sampled value, for the dynamics with a longer duration, the phasor volume of the real imaginary part is used to calculate the amount of electricity. The order of the amount of work in the frequency impedance and other Ding Dian electrical scene total, thus reducing the anonymity of the record data record guarantee the integrity of the information 2.3 support network centralized management and remote management due to more power plant units, the traditional fault recording device The requirements of the line management used 3. For this purpose, the new monitoring and recording device is set up with the function of interconnection of the Internet, and the network of the monitoring and recording system of the plant of the power plant can be configured as required to achieve the set-up. The requirement for data sharing also facilitates the linkage with the integrated mobilization system of the power plant. In addition, the device can perform data exchange through a higher-level dispatch department line in the same way to achieve remote monitoring and management.
2.4 The use of a variety of wave recording start mode, easy to use the site to record fluctuations, according to the abnormal changes in the operating conditions of the transformer group and the characteristics of the failure to set the phase of the sudden change in the amount of load and steady start.
Reverse power with dynamic low excitation and magnetic start. Excited magnetic activity. The frequency difference is 6, the frequency change rate is activated, the switch is started, and the manual and remote start and so on. In addition, in order to facilitate the on-site flexible monitoring and recording of the electrical and non-electrical quantities required to simulate the road can be set to abrupt 6 dynamic and steady-state start with excess and low-volume startup to meet the needs of the field, requirements , 2.5 Enhanced oscillographic data analysis function to meet the needs of on-site accident analysis In order to meet the needs of the unit accident analysis and analysis of protection and safety automatic device action behavior, the device is equipped with a comprehensive analysis software for fault data comprehensive analysis. In view of the complex causes of unit faults and the diversity of protection and safety automatic device construction principles, in addition to providing regular waveform display and editing functions in analysis software design, emphasis is placed on the calculation of basic parameters required for accident analysis and the sharing of prayers. , Mainly including waveform analysis Phasor analysis Sequential analysis Harmonic analysis Active and reactive power analysis Frequency analysis Terminal measurement Impedance analysis Differential current analysis Generator power angle change analysis and unit experimental results analysis.
2.6 Adopting a modular, dedicated hardware platform based on outsourcing, a good openness, reliable operation, and a machine system that is suitable for the harsh operating environment requirements of the Ten Power System were jointly developed by Beijing Kangtuo and Huazhong University of Science and Technology. In the development process, the special requirements of the power system application field and the current development trend of industrial computers are fully considered. With the advantages of compact structure, abundant resources, good scalability, strong anti-interference ability, and reliable operation, it is at the leading level in the field of domestic industrial control machines.
2.7 Friendly interface, convenient operation and use The human-machine interface adopts visual programming software based on the evaluation platform as the main development tool, full Chinese menus and dialogs, and adapts to the requirements of the current window of culture in application software. Modular body, outer steel waterproof structure, unique positive pressure cooling and dust removal design, ideal for electromagnetic radiation and power station environment with large dust or humidity. Equipped with a dedicated 08 interface card and remote elbow, 1 can be real view, automatic clock. And remote transmission of test data and fault recorder data.
3.2 Data acquisition layer The system data acquisition layer system is composed of a new generation 15000 industrial control plane. This machine adopts a European-style card in-line structure and supports the compatibility with the 1960 bus 996 positive and 996 bus, and 0 bus. 0,01 bus. Under the premise of making full use of system resources, it meets the requirements of harsh industrial operating environments. Each template uses a pinhole connector to connect to a passive motherboard, eliminating the edge gold finger connection. Strong anti-impact and strong, moving ability.
The stencils are elastically connected via a standard 323 core pin connector. The possible unreliability of the traditional flat cable connection is completely eliminated. The main 0-board is a block-based high-dyed 486 single-board machine that uses surface mount technology. Frequency, up to 13 test 2.3201.
It can meet the storage requirements of large data storage. , The new generation of high-performance 0 discs, 2000 cores, can constitute an electronic disk capacity of 40, for the backup of record data. 16-bit out, interface, support for network connection.
The data acquisition board uses a digital signal processor as a smart component, which has strong data processing capability and stable and reliable operation. The use of 16-bit high precision IO converters significantly improves the accurate structural design of the recorded data. Convenient extension and modification of functions. In addition. In order to facilitate the hardware structure of the field 3 device, the device adopts a layered structure of 1. It mainly includes most of the management data acquisition layer and the isolation transformation layer.
3.1 Management Systematic. High-speed optocoupler devices are used to isolate digital circuits from analog circuits. Greatly improves the anti-jamming performance of the system.
3.3 Isolation and Transformation Layers The various numbers of access systems are sent to the data collection layer for processing after being isolated. AC voltage and current signals use high-precision isolation transformers to perform conversion. Each DC signal in the excitation system of the unit is isolated and transformed using a specially designed dedicated isolation amplifier. In addition, in view of the fact that the generator rotor circuit may generate thousands of volts of high voltage during the demagnetization process, in order to prevent the high voltage from directly hitting the screen, the shadow management layer system adopts an industrialized workstation at Advantech to form a cutting station, a small device, and a sweet shoulder system. Thousands of dish set regular work and Beggar transport hall personnel safety car!
Measurements of relay path electricity use special pre-measures. Make the upper screen voltage lower than 100. Each input and output channel adopts multiple opto-isolation processing technologies to improve the anti-interference capability of the device, and the data acquisition layer and the management of the data communication system are out of order. In order to facilitate the rapid transmission of large-capacity recording data, it is also convenient to form the local oscillographic network and interconnect with the integrated automation system of the power plant as required. The intelligent network processor can automatically perform data verification and network management, and realizes that the 1s and 1s also communicate information through the long-range scheduling department. Achieve remote line inspection of unit operation status and 矜4 software design features and functions 4.1 Management Software Management The main management unit completes the operation and commissioning management of the online monitoring of unit operating status. Therefore, the formation of the report and the query and modification of the print setting value and the timing of mutual inspection with the data acquisition layer unit. In addition, according to the remote control commands and the unit operation status, the remote data transmission is scheduled and controlled.
The soft layer of the ground floor is designed with a view-oriented development tool. Milk 1 is used as an operating system, and its network functions are very versatile and can be applied to different hardware platforms. The multi-threaded mechanism improves the system's response capability and assists the multi-task parallel processing function provided by the community, and performs task scheduling through message-driven and rights-management methods. The interface design of the software emphasizes the full display of information and the flexibility of operation. The operation and debugging of the device is managed through the Chinese menu. The factory site operation is only released. 4.2 The data acquisition layer software data acquisition layer mainly completes the transmission 4 Data farm sample and fault detection and judgment. In the case of normal games. The sampled data is preserved in the area designated by Baodan, and it is constantly refreshed. At the same time, it is interspersed with hardware self-checking, setting value checking, and mutual inspection with the management machine timing, and receiving the monitoring command transmitted by the management machine to complete related operations.
plant! Moving conditions are met. According to the fault record, paragraph requirements. Data logging is performed and related signal relays and printer power are activated at the same time.
The recorded wave data is stored in the local electronic disk backup in addition to 000, at the same time by the network communication in a timely manner to the management machine to save and pass, 1! Card automatic remote transmission The data acquisition layer software of the upper-level dispatching department adopts 6, + as the main development tool. The part that requires higher real-time calculations is programmed in the embedded assembly language, so that the software maintenance and debugging and the performance expansion performance are greatly improved. At the same time, it also ensures a high degree of software reliability. The calculation of the average value of the direct current in the real and imaginary part of the root flow, the calculation of various sequential quantities and the calculation of the frequency measurement, etc., are mainly completed by 1 to give full play to its computational advantages. The 486,1 board is responsible for the start of the determination of segmented storage control data and data transfer. In this way, it is convenient to use the 005 system resources and future functions. In addition, in the software design, multi-level review measures were adopted to prevent possible interference from 4 interferences! move. Welcome to points, offices, technology, and improve the efficiency of the system. 4.3 Failure Data Analysis Software Failure analysis software can be used for online analysis. It can also be used as an independent analysis software. Each analysis function can be flexibly configured according to actual needs. The main functions of the analysis software include waveform analysis to provide six different forms of waveform display mode, no synthesis, no local amplification, and waveform compression. At the same time as the waveform is displayed, the instantaneous value of the analog signal can be viewed at any time, and the immediate printout is needed. The phase sequence analysis can calculate the total time, 1; the phase-frequency voltage and current RMS and phase, and positive and negative zeros. Calculate the magnitude and phase of the sequence component, calculate the amplitude and phase of the AC circuit, and the average value of the DC component. The result of the calculation can be summoned for printout.
Harmonic analysis calculates the distribution of harmonic components contained in signals for any period of time. And the spectrum measurement impedance analysis calculates the module value and phase of the measurement impedance of the generator terminal, and measures the impedance change trajectory on the impedance plane to provide the dependence of the unit demagnetization failure analysis.
Power and Frequency Analysis Calculate the power and reactive power of the high-voltage side of the generator transformer and the factory variable instruments and the value of the 1 off frequency, and change the curve.
The differential flow analysis calculates the differential current values ​​corresponding to the differential protection of the generator-transformer group and the differential current curve.
Generator power angle analysis Calculate the phase angle between the generator internal potential and the bus voltage transformer high voltage side or other specified voltage, and change the curve.
The analysis of the timing of the switching of the switch will analyze the timing of the switching of the switched digital signals and give the analysis results in a grid pattern.
The data record format conversion is used for the exchange of the record information of the corpse dump, expands the application range of the fault data, and the software provides the conversion function of the data record format. Available upon request. Convert record data to sink. 0 in standard format.
Analysis of experimental data is based on the main experimental data of the unit, such as the collection of the data of the airborne special package to the electric and juice calculators.嫉 å¡ å¡ å¡ short circuit, and fake the same period of experiments. Analyze processing.
Form related experimental reports.
5 Concluding remarks In order to better meet the needs of integrated automation of power plants and future maintenance of equipment status, the traditional record of the unit should be recorded and analyzed with the test data of the set operation state, as well as the comprehensive system direction of the fault data recording and analysis. In addition, in the data recording mode, the recording data analysis function and the wave data analysis function should also be improved and improved. With Shihao's ability to provide on-site recording and analysis systems with a feature-rich inspection record and comprehensive failure analysis capabilities, it is expected to play an active role in improving the unit's safe operation level.
Investigation Report on Relay Protection of 1 Large Unit . Power automation equipment. 1996 2 2005 Technical guidelines for dynamic recording of faults in power systems, Ministry of Electric Power, 1995.
3 Zhao Zigang, Zhao Chunlei. Status Analysis of Domestic Fault Wave Recorder and Prospect of New Wave Recorder . Power Grid Technology, 199934446.
Systematic protection and control of teaching and research
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