Fuzzy Evaluation and Comprehensive Diagnosis of Steam Turbine Generator Faults

5=AngsanaUPC7 engineering technology and major projects demonstrate the comparative analysis of cavitation and wear of turbines under clear water and mud-sand water conditions. Li Yue's surface cavitation and wear damage of turbine over-flow components running in mud-sand water is more serious. Because the formation mechanism of this destructive effect is more complicated, there are still different views on the causes and failure characteristics of such damage, such as cavitation damage or wear damage, or joint destruction.

The machine is in a similar installation environment and similar management level, but the long-term operation under different water quality conditions is a comparative analysis to explore the causes and characteristics of cavitation and wear damage of the two-station 双0 double 59 turbine. The technical demonstration of the station proved to have obvious effect. 3 Conclusion, the unit of the Xinfang Power Station operates under clear water conditions, mainly characterized by cavitation damage. Because of the cavitation damage process, an oxidation protection layer is formed on the material surface along with the oxidation reaction phenomenon. Therefore, the single cavitation damage is slow, that is, the cavitation stability period is long, and the Pu'er River power station unit is in the muddy sand water condition. The plant operates and exhibits joint damage characteristics of cavitation and wear. Due to the combined effect of cavitation and wear, the damage function is greatly enhanced, which causes great damage to the operation of the turbine. Due to the continuous friction of the muddy sand, the metal surface is not easy to form an oxidized protective layer, and the micro-scratches on the metal surface are continuously generated, which creates conditions for the micro-water jet micro-jet damage caused by the cavitation mechanical action. Due to cavitation, the metal surface is rough, and the pitting point is generated. It is easy to be impacted by mud and sand particles, grinding and removing metal particles; in the absence of cavitation conditions, the pure mud sand wear characteristics should be smooth and flat, such as pressure pipe, volute overflow surface. Under the condition of no sand and sand wear, the pure cavitation characteristics should be sponge-like honeycomb pitting, and there is a stab feeling when the damage is serious. When cavitation and mud sand wear together, there are both the above-mentioned simple cavitation characteristics or simple wear characteristics, as well as the groove-like cutting features of the fish crater. These features are often overlapped and combined, and the hand is neither smooth nor thorny. hand. They should be the expansion of cavitation pitting under the action of mud sand grinding. Turbines operating under muddy water conditions have a great deal of damage due to the combined effects of cavitation wear. Therefore, we must solve the problem at all. It is necessary to remove the deputy manager and chief engineer of the deputy secretary of the party committee of the company. Address: Design and Analysis of Substation Automation System Based on Fieldbus Technology in the Market of Moonlight in Simao City. The technical requirements of the automation system of Fengqing East Station are analyzed. The shortcomings of the automation system of the existing station are analyzed. The design idea of ​​substation automation system based on fieldbus technology is introduced. The information resource balancing method is given, and the development examples and application modes are given.

The power market environment requires that the plant automation system must ensure accurate and reliable data collection, high real-time performance, and continuous uninterrupted 3 transmission channels must have full-duplex communication functions, and properly handle the statistical calculation and transmission of ultra-large-capacity data storage. RTC has incomplete functions in terms of data collection and processing capabilities, lack of capacity, special protocol, can not allow the first device to easily access the system, does not realize the entire network clock, it is difficult to copy the gateway data at the same time The data conversion uses 4,201 analog signals. The digital signal processing of the analog signals is done on the computer side, the anti-interference ability is poor, the data reliability is low, and the functions are repeatedly set.

With the development of microprocessor technology and computer network technology, substation automation system based on fieldbus technology emerges as the times require, which can solve the problem of the relatively closed function of the current plant automation system. The fieldbus refers to the field instrument and the digital Control system input and output have become the focus of the computer industry control community in recent years. The reason is that it has introduced a new system integration idea. The fieldbus has a structural function with a comprehensive height of openness and reliability for system configuration and decentralized control. The outstanding feature of the fieldbus is that it overcomes the shortcomings of communication in the implementation of the closed private network system in the 06 system, turning the solution based on the closure into a solution based on open standards. The overall design process of substation automation system based on fieldbus technology should focus on the following points, adopting hierarchical distributed system structure, relay protection function is relatively independent, avoiding hardware repetition, setting clock system and adopting object-oriented design method. platform. The communication network extension can adopt the star network ring network bus shape and free shape. The ready-made bus with the stomach 0 allows access to multiple communication media in the same network.

The medium possession control mode can be adopted, 0 mountain mode 83; mode and mode, and pay attention to the reliability and anti-interference ability of the system.

He is a Ph.D. student at the School of Electrical and Information Engineering of Lili University and deputy director of the Liaoyang Electric Power Bureau. He has published more than 10 papers in academic journals and conferences at home and abroad. Address: No. 123, Minzhu Road, Baita District, Liaoyang City, Liaoning Province, 1000 0 in Northeast Power Technology, sponsored by China Northeast Electric Power Group Co., Ltd., Fuzzy Evaluation and Comprehensive Diagnosis of Steam Turbine Generator Faults Xu Feng Song Chaoyi Li Guojun Liu Shuangbao Modern Power Plant The scale is constantly expanding, its complexity is raised, and the system investment is huge. It is urgent to improve the reliability and safety of the system to ensure the safe and economic operation of the unit. The failure of steam turbine generator set is the main reason that affects the safe and economic operation of power plants. Therefore, it is an important lesson in today's power system to conduct scientific and technological advancement and sustainable development monitoring of the operation of the steam turbine unit in the western region. In recent years, with the continuous improvement of the modernization level of production equipment, state maintenance technology has been listed as the cutting-edge technology for power systems. Many results of theoretical research on equipment diagnostic technology are gradually applied to the actual work of electric power production. 3 Although the fuzzy diagnosis method has the determination of the membership function and the diagnostic accuracy, it has the advantages of simple and practical calculation, so that it is especially useful in fault diagnosis. The field of vibration fault diagnosis has been applied. If other methods are used in the troubleshooting process to determine the cause of the failure, it will meet the actual needs of the production and will be more widely used. This paper mainly uses fuzzy evaluation and comprehensive diagnosis method to diagnose the fault of steam turbine generator set to solve the actual problem in power production, and then create conditions for state maintenance of power production. In this paper, from the analysis and calculation of the fault fuzzy evaluation method of the steam turbine generator set to the comprehensive diagnosis of the fault, the paper makes a detailed discussion and makes a useful discussion. The fuzzy diagnosis method is used to solve the vibration problem of the 1 steam turbine generator set of Tieling Power Plant. Judging; applying the axis trajectory Bode fault tree and other methods to comprehensively diagnose the vibration of the 1 turbo-generator set of Tieling Power Plant, verifying and supplementing the fuzzy diagnosis method, and obtaining the following conclusions 1 Using fuzzy evaluation method to analyze steam turbine power generation The cause of unit vibration failure is feasible, and the calculation is simple, but the shortcoming is that the accuracy of judgment is not high. The fuzzy evaluation method is used to analyze the vibration fault of steam turbine generator set. Some faults cannot be specified for single fault. The key lies in the accuracy of R relation matrix. The fault characteristic parameters are comprehensively diagnosed to determine the cause of the fault. The fuzzy evaluation and the comprehensive diagnosis method are used to analyze the turbine generator vibration fault by using the axial trajectory Bode fault tree method, which can accurately find the fault cause and solve the power production. The actual question in the middle provides analyzing the cause of the vibration fault of the steam turbine generator set.

The development of the magic 01 type DC grounding automatic detection device Guo Chunzhi author absorbs the advantages and disadvantages of several products, combined with the actual development of the field, a type 1 DC grounding automatic detection device.

The device consists of a low-frequency signal generator independent DC grounding automatic detection relay handheld detection device. It features a distributed DC grounding automatic detection relay as the detection component of each unit. There is also a unique handheld detection device.

When a DC ground fault occurs, the ground fault alarm relay is restarted to start the low frequency signal generator to send a signal. The grounding unit DC grounding automatic detection relay operates within 0.5 seconds. After the signal 3 is detected to ground the specific unit, the independent handheld can be used. The type of detection device continues to find a specific location.

The outstanding feature of the handheld detection device is its ability to withstand the effects of capacitive currents. It not only detects low-frequency AC current, but also recognizes the phase relationship between the low-frequency AC current and the output voltage of the low-frequency signal generator. A walkie-talkie is installed at the signal generator, and the low-frequency voltage is formed into a square wave, and then modulated by the walkie-talkie. The hand-held detection device has a separate walkie-talkie that receives the voltage phase signal and transmits the signal to the hand-held detection device. In this way, the current value measured by the hand-held detecting device, combined with the phase value between the current and the voltage, can obtain the active component in the current, thereby overcoming the influence of the capacitor current. Two walkie-talkies can also be used for call contact during troubleshooting.

The device has the following advantages: zero-distance analog signal transmission, no attenuation, and no transmission channel anti-jamming. , independent relay mode, real-time acquisition, local processing, sensitive, reliable, with clear selectivity. The relay can be directly designed and installed on the control panel and the protection screen by the manufacturer. Without the on-site installation, the expansion is easy. The grounding alarm signal is sent directly from the screen cable to the main console, which is intuitive and clear. No need to lay special cables to save money and effort. Real-time acquisition can reliably capture short-term fault information, which is especially beneficial for finding instantaneous DC grounding. The inspection mode of the above models is not easy to implement because the inspection cycle is on the order of minutes.

5. Deputy Director of Liaoyang Substation, senior engineer, several times won the original Dongdian Science and Technology Progress Award, zip code 1000; telephone for the development and application of the 1921281 subcritical parameter power station boiler continuous sewage system optimization and transformation equipment Shen Jingquan Meng Xianjie Guo Zhongan Wu Tieshan Fang Chunhui Wei Liqi is responsible for the high-pressure differential working fluid scouring of the continuous sewage system of the subcritical power station boiler, resulting in equipment damage caused by cavitation, thinning or even leakage of the pipe elbow wall, resulting in the failure of the continuous sewage system to operate normally. From the perspective of the optimization, the continuous sewage system is optimized.

Developed a large differential pressure anti-cavitation device for regulating valves. It is based on the technology of the United States and the company. According to the multi-stage pressure-reducing principle, the valve cage type is used to fully release the pressure energy and noise in the valve cage through the working fluid of the protected valve. The quality seals the joint surface through the valve, thereby reducing the large differential pressure drop and changing the operating condition of the valve to protect the valve. The large differential pressure anti-cavitation device adopts constant flow and constant pressure drop design. After installation, the system flow will not be reduced, and the local resistance will increase slightly, but the thermal efficiency of the unit will not be affected. The device is made of high-quality alloy material and is processed and manufactured. After strict inspection and pressure test, the quality of the flow is guaranteed. The volume is small, the weight is light, the installation is convenient, safe and reliable.

The development of the 1896632, 50-type electric sewage control valve, the introduction of the subcritical parameter power plant boiler continuous sewage system, the introduction of the imported angle control valve, only has a step-down device, the decompression effect is not ideal, and the price is expensive. 1896832, 50 type electric sewage discharge regulating valve adopts the way of the lower cone of the valve core and the lower taper hole of the valve seat to control the flow rate and pressure drop, and then the pressure is reduced again by the equalizing flow hood, which has a step-down pressure and good decompression effect. The core sealing surface cooperates with the upper seat of the valve seat to ensure complete sealing. The valve stem material is made of high-performance alloy steel with sufficient hardness and toughness. The sealing surface of the valve seat is welded with hard alloy, wear-resistant and erosion-resistant, which ensures the service life of the valve is reliable, and the price is only It is 13 for imported equipment of the same type, saving equipment renovation costs.

Adding industrial heating facilities to recycle and use continuous steam to the north of China

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