Integrated Intelligent Energy

Application of tiny-oil ignition burner in 300MW sub-critical natural circulation boiler

QIU Ya-lin;ZI Yun-jiang;LI Ming-liang;YANG Li

2008, 30(10): 1-3.

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The principle, structure and system composition of tiny-oil ignition burner were expounded. The application of tiny-oil ignition burner in Kunming No.2 Power Plant was introduced. Aiming at the problems occurred in operation, some relevant improvement measures were proposed.

Relevant research of electromagnetic loop opening for 500kV/220kV electromagnetic loop operation

LIN Wu-han

2008, 30(10): 4-6.

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The electromagnetic loop operation means that the lines with different voltage classes operate parallel which connected together through the electromagnetic circuit by using transformers in the two terminal. The problems existing in the electromagnetic loop operation were analyzed. A series of rules for electromagnetic loop opening was put forward which includes static stability, dynamic stability and economic efficiency etc. The concrete application of synthetical, multilayer fuzzy evaluation method was introduced. The author believes that the electromagnetic loop opening scheme based on synthetical, multilayer fuzzy evaluation is feasible and has practical significance.

Discussion about safety operation of asynchronous motor

ZHANG Xiang-yu

2008, 30(10): 7-10.

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The selection of asynchronous motor, the preparation work before starting-up and the protection devices of asynchronous motor were introduced in detail. The reasons of common mechanical and electrical failures in asynchronous motor were analyzed. The operation parameters of asynchronous motor and the problems needing attention in its maintenance were put forward.

Research of relay protection management information system based on workflow technology

SHI Jiang-tian;WANG Tong

2008, 30(10): 11-13.

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The workflow technology, as a hot point in field of computer application research in late years, was becoming an effective way for resolving some systematic engineering problems, and the research of workflow technology was developed widely and the fast progresses were obtained. The realization scheme of workflow management system based on the Web Email was put forward, and the relay protection management information system based on workflow technology was built. The system is easy to use due to the simple operation, and there are no additional software and hardware needed.

Principle and Application of Thermometer for Transformer Winding

CHEN Pei-wei;CHEN Tao

2008, 30(10): 14-15.

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The transformer lifespan depends on its winding temperature. The winding temperature has decisive function to insulating material temperature aging, therefore, the winding temperature measurement devices are allocated in large and medium transformer. The principle of thermometer for transformer winding was presented. The supervisory instrument must be reliable, the over temperature of transformer winding and over tolerance of supervisory instrument will influence the transformer normal operation. The matters needing attention in using of thermometer for winding were expounded.

A partition decoupled state estimation model based on PMU

LIU Feng-xiu

2008, 30(10): 16-18.

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The synchronous phasor measurement unit(PMU) configuration causing state estimation partition decoupling was studied, a partition coupled state estimation model was established in which the PMU was introduced. By using the voltage measurement of PMU, a whole electric power system is partitioned to several sub-system nets for state estimation respectively, and there are not data exchange between the sub-systems. The branch current phasors of PMU can be transformed into relevant node voltage phasors or relevant branch tidal current, the accuracy and redundancy of measurement data are increased, and the performance of state estimation is raised. The simulation arming at IEEE30 node calculation example shows that when the PMU measurement accuracy is higher, the accuracy and speed of partition decoupled state estimation model was increased compared with that of the routine model using PMU. Along with the increase of partition and the applicaton of computer parallel processing technique, the real time state estimation of electric power system will be possible.

Analysis of reactive power optimization in the electricity market environment

CAO Qi-lin;HU Wei-hua

2008, 30(10): 19-21.

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The reactive power optimization of power system is an effective measure to ensure the power system safety and economical operation. The general concept of electricity market was introduced, the problem of reactive power optimization in the electricity market environment was analyzed in detail, and the important significance of reactive power optimization for power system was pointed out. It was expounded that aiming at present electricity market environment, the problem of reactive power optimization is worth further researching.

Model Choice and Design Idea of Electric ‘Five Protection’ Device

XUE Yu-xi

2008, 30(10): 22-26.

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Based on analysis of the applicable scope of various electric ‘five protection’ device and the equipment features of Yangzhou Second Power Plant, the on-line micro-computer ‘five protection’ scheme was selected. According to the principle of complete function and convenient for use, the system design idea was expounded. The system structure, anti-misoperation lockout logic and system main function were introduced briefly.

A novel algorithm of SVPWM without sectors deciding and its simulation study

SU Hang;CHEN Dong-hua;SUN Zhong-bing;ZHOU Yi;PANG Jian

2008, 30(10): 27-30.

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A novel algorithm of SVPWM was proposed according to the analysis of SVPWM essence. The algorithm obtains the vector action time by calculation directly without complex coordination transformation and sectors deciding. Compared with traditional SVPWM algorithm, the new algorithm can reduce calculating amount obviously, and this is useful for digital programming. The calculating formulas of new algorithm were derived, and the simulation study was accomplished under the Matlab/Simulink environment. The result of simulation proves that the new algorithm is correct and effective.

Design of FGD electric system in large thermal power plant

GUO Wei

2008, 30(10): 31-33.

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The flue gas desulfurization(FGD) electric system main bus connection and the system composition were introduced. The components of FGD electric system were described which includes control, protection, signal and measurement. The actions of accident protection load, direct system and UPS of FGD electric system were analyzed, and the matters needing attention in design were pointed out.

Application of guided waves in detection of pipeline of power boiler

WANG Yi;CAI Hong-sheng

2008, 30(10): 34-36.

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The feasibility of applying ultrasonic guided waves in detection of power boiler main steam pipe was discussed. The proper guided wave mode was selected for experiment. The experimental result shows that the detection of main steam pipe applying ultrasonic guided waves is feasible. In the experiment, the notch with depth of 1.5mm and width of 0.2mm in inner surface and outer surface of a pipe were detected, and the detection was much faster than traditional point-by-point detection method.

Calculation and control of the Dam concrete temperature in Hydro-Power Station

HU Wei-hua;PANG Chong-lin;HU Jun

2008, 30(10): 37-40.

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The Dam of Kuaizehe Hydro-power Station is single-curved, high arch cast-on place concrete dam. The temperature inside the dam body will raise due to the concrete hydration heat. Under certain constraint condition, the greater expansion stress will occur due to the higher temperature, and this lead to create the crack in concrete, the dam engineering quality will be influenced. In this paper, the dam concrete temperature field was calculated and analyzed in detail, and relevant concrete temperature control measures were proposed.

The Energy-saving and Effect-raising Reformation of Electro-static Precipitator in 320MW Unit

LI Yi-qiong;LU Ze-feng;FU Qi-wen

2008, 30(10): 41-44.

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In order to decrease the operation power consumption of electro-static precipitator and to further raise the dust collecting efficiency, the original control system of electro-static precipitator in Wangting Power Plant unit No.11 was overall technically reformed by using “Energy-saving and Effect-raising type EP Power Supply and Control System”. After the reformation, the dust collecting power decreases by a factor of 81.2%， average dust collecting efficiency increases by a factor of 0.29%, and dust discharge amount at outlet decreases by a factor of 28.9%, so an obvious energy-saving and effect-raising result is obtained, and the operation automation level of electro-static precipitator is raised also. This affords useful experience for similar projects.

Application of three dimensional design in nuclear power Project

ZHANG Xin

2008, 30(10): 45-47.

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The three dimensional design is becoming a trend. Taking the Ling’ao Nuclear Project phase II for example, the application of three dimensional design software was introduced, some problems occurred in application were analyzed, and some suggestions aimed at the problems were put forward.

Application of Permanent Magnetic Mechanism in the Medium Voltage Vacuum Circuit Breaker

ZHOU Li-jie

2008, 30(10): 48-50.

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The features, structure and actuation principle of permanent magnetic mechanism were analyzed in detail by comparison of advantages and disadvantages of various operation mechanisms of medium voltage vacuum circuit breaker. And it was proved that the application of permanent magnetic mechanism in the 6～40.5kV medium voltage vacuum circuit breaker is very important for the development direction, the target of which is to make maintenance-free products.

The Reason Analysis and Repair of Hydrogen Leakage in 400MW Whole Hydrogen Cooled Generator

LIU Guo-hong

2008, 30(10): 51-53.

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At present, the whole hydrogen cooled generators are mainly used in the gas-steam combined cycle units in the domestic. The reason of hydrogen leakage occurred in the installation process of introduced 400MW whole hydrogen cooled generator was analyzed, and the leakage inspection method and the handling method of hydrogen leakage were described in detail.

Self-circulation oil system of lower combined bearing in the generator/motor of pumped storage station

ZHENG Jian-feng;ZHANG Guo-fang;JIANG Chi-jian

2008, 30(10): 54-56.

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The function and construction of self-circulation oil system of lower combined bearing in the generator/motor were introduced which is energy-saving and high reliable. The operation status and operation data of Zhejiang Tongbai Pumped Storage Station, in which the self-circulation oil system is used, were analyzed. The analysis and comparison of operation data show that the operation status of the whole oil circulation system is well.

Maintenance of import fire-resistant oil for hydraulic control system of steam turbine

LEI Jian-ping

2008, 30(10): 57-58.

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The controlling liquids for hydraulic control system(fire-resistant oil) of many current superpressure, high-duty generation units are imported from abroad, and the most general one in which is Furquel EHC oil. The practical application experiences of fire-resistant oil in Yuanbaoshan Power Plant were introduced. The selection, using and maintenance of Furquel EHC oil were analyzed according to the performance index and characteristics of the oil for reference for persons of the same trade.

The connection mode causing metering error

XIE Jie-shu

2008, 30(10): 59-60.

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Accuracy is the basic requirement of electricity metering, and correct connection is the precondition for metering accuracy. Some connections mode which can cause metering error but was unnoticed in practice often were summarized. The secondary circuit connection causing error due to improper grounding was analyzed, and the treatment measures were given in this paper.

Research of hydrogen purity decrease in hydrogen cooled unit

SHENG Hu

2008, 30(10): 61-62.

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The hydrogen purity of unit №3 in Huadian Zhangqiu Power Generation Corporation Limited was decreasing faster, and this caused that the hydrogen inside generator must be purified frequently. The problems mentioned above were analyzed, some relevant measures were adopted, and the sealing oil system was adjusted using running and shut-down opportunity. Then the problem of hydrogen purity decrease was resolved finally, and unit safety, stable operation was achieved.

The defect of microcomputer protection device tripping circuit supervisor and improvement measures

LI Jian-guang;FENG Wen-shuai

2008, 30(10): 63-65.

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The application of DRS digital protection device manufactured by Austria ELIN Corporation as tripping circuit supervisor in Tianhuangping Pumped-Storage Power Station was introduced. Through the comparison with principles of common tripping circuit supervisors, domestic and abroad, take the tripping circuit supervisors of 500KV switch and generator switch as examples, the working principle and defect of the device at different conditions were analyzed in detail. The improvement measures were proposed combining the site requirement, the problems existing in the system were resolved, and a better result was obtained.

Treatment of crack in steam inlet conduit of the lower medium-pressure cylinder

WANG Wei

2008, 30(10): 66-67.

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The cracks in steam inlet conduit welding seam of the lower medium-pressure cylinder of Huangpu Power Plant Unit No.6 were found by metallographic examination. This major defect was eliminated by flexible application of the patch weld technology, the heat treatment technology and the repair working process, and a better result was obtained. In this paper, the repairing process was summarized for reference.

Comparison between the high voltage variable frequency speed control and inner feed chopper cascade speed control

HE Fei;MA Fei

2008, 30(10): 68-71.

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According to the practical application of high voltage variable frequency speed controller and inner feed chopping cascade speed controller and their energy-saving effect, the principles and technical features of the two speed controllers were analyzed. The construction, performance, economical efficiency, reliability and technical advancement of the two speed controllers were compared each other. The development of the two speed controllers was discussed.

Application of Novel Instrument-electric integration Distributed Control System

ZHU Neng-fei

2008, 30(10): 72-74.

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The system configuration and control scheme of the novel DCS-TCS3000 instrument-electric integration distributed control system used in 2×300MW units of Qiqihaer Thermal-Electric Generation Corporation Limited were introduced, and the application and innovative features of the system were described also. The experience obtained in Qiqihaer Thermal-Electric Generation Corporation Limited is useful for the applications of the system in other power plants.

Discussion on Emission of Sulfur Dioxide Calculation Combine Desulfurization Inside CFB Boiler with Outside Boiler

PAN Jun-bin

2008, 30(10): 75-77.

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The sulfur dioxide emissions of circulating fluidized bed boiler, in which the poor-grade coal with high sulfur and low heat value was burned and different desulfurization methods were adopted, were calculated and compared. The desulfurization combustion calculation of CFB boiler and sulfur dioxide emission of desulfurization outside the boiler were combined and analyzed. The calculations shows that when the process of inside boiler desulfurization combining with outside boiler desulfurization is adopted, the CFB boiler can burn poor-grade coal with high sulfur and can satisfy environment protection demands at the same time.

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