Integrated Intelligent Energy

Analysis on reasons of switch tripping caused by interrupt of 110V DC power source

HAN Xianghu

2013, 35(9): 1-3.

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Abstract:Once, an abnormal condition of 110V DC control power source caused the switch of the standby power source of PC bus of emergency power supply to trip. The reason of the bus voltage failure was analyzed, and it was found that there are many problems in the system design and device selection of the system. The solution was put forward, and the problem, which is that the DC power supply failure causes the switch in lower level to trip incorrectly, was solved thoroughly.

Application of correlation analysis technology in smart power grid alarm system

GUAN Guofei 1, XU Chunlei 2, SONG Qingwu 1

2013, 35(9): 4-6.

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Abstract:The importance of the correlation analysis technology in the smart power grid monitoring and alarm system was introduced. The working principle of the correlated events analyzing engine and the functions of the correlation analyzing engine were expounded. Taking the correlated events analyzing engine as specific example, the methods to use the analysis functions of the correlation analysis engine and to find the true fault source from numerous alarm events were expounded.

Analysis on reasons of fault of compensation capacitor in 6kV ungrounded system

BU Fanwei, NI Jianmin

2013, 35(9): 7-8.

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Abstract:In the 6kV ungrounded system of the water source area of Huadian International Zouxian Power Plant project phase III, when the power supply was switched on after protection overhaul, the voltage transformer gave out a zero sequence over voltage alarm signal, and the each phasetoground capacitors of the 6kV ungrounded system were not balanced. The reasons of the fault were analyzed. The effective measures were adopted, and the problem was solved.

Analysis and Improvement of connection mode of DC system in power plant

TANG Hongqi

2013, 35(9): 9-11.

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Abstract:Taking the units No.3 and No.4 of Xinjiang Huadian Hongyanchi Power Generation Company Limited as example, the connection mode and the operation characteristics of the DC system of power generation unit were introduced. The main problems existed in the connection of DC system of the power generation units were analyzed. Some improvement measures were proposed, and the reliability of power supply of the improved DC systems of units No.3 and No.4 was enhanced.

Design of automatic quasisynchronization module for 9FA gas turbine generator

WANG Zhigang 1, LI Liangyong 2, YU Weiwei 2

2013, 35(9): 12-14.

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Abstract:The particularity of the automatic quasisynchronization module of 9EA gas turbine generator manufactured by GE was analyzed. The software and hardware design and the interface means of the module were studied. The result of this paper can be used as reference for domestic similar unit in operation and maintenance.

Design of cooling system of large capacity general power electronic module

HUANG Tao

2013, 35(9): 15-18.

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Abstract:The 750kV·A large capacity power electronic module was introduced. The calculation method of power dissipation of the insulated gate bipolar transistor (IGBT) was expounded. A new type water cooling heat sink was designed, and the simulation optimization of the heat sink was carried out by thermal analyzing software system Qfin. The optimal inlet water flow of the water cooling heat sink was selected and verified practically by test platform. The test result shows that the performance of the heat sink can meet the design requirements.

Development of online fault monitoring system of boiler soot blower

DONG Ruixin 1, ZHUO Deyong 2, WU Chaofeng 2, YANG Qitao 2

2013, 35(9): 19-21.

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Abstract:Combining with practical situation of the 350MW boiler soot blower of Huadian Tengzhou Xinyuan Thermal Power Company Limited, the reasons of the faults of power plant boiler soot blower were analyzed. An online fault monitoring system of boiler soot blower was developed, and the online soot blower fault monitoring and alarm were realized. The online fault monitoring system of boiler soot blower can prompt the operators and the maintainers to eliminate the fault of the soot blower timely.

Analysis on layout of hydraulic pipeline of thermal power plant

HAN Gang

2013, 35(9): 22-23.

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Abstract:The principle and the method of the hydraulic pipeline layout in plant area of thermal power plants were introduced. Taking a northern 2×300MW wet cooling thermal power unit as example, the hydraulic pipeline layout in key area of the plant was analyzed. The result in this paper is helpful to improve the efficiency of the hydraulic pipeline layout in the plant area

Analysis on generic objectoriented substation events test

FENG Ziquan 1，ZHENG Gailing 2,LI Mingyu 1，YANG Wei 1

2013, 35(9): 24-26.

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Abstract:The concept and basic functions of the generic objectoriented substation events (GOOSE) were introduced. The measuring methods of several GOOSEs commonused in intelligent substation were analyzed. In the measuring, according to the design principle, various phenomena can be simulated to decide if the GOOSE report receive scheme can meet the design requirement.

Comparison of steam turbine clearance measurement control system and conventional clearance measurement method

ZHANG Zhenyu, SHU Zhengyu

2013, 35(9): 27-31.

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Abstract:Taking the final assembly clearance control of the steam seal of the turbine in AP1000 nuclear power unit as example, the characteristics of the laser clearance measurement method and the characteristics of the conventional clearance measurement method were analyzed, and the advantages and disadvantages of the two methods were compared. The laser clearance measurement method was adopted for measuring, and the conventional clearance measurement method was adopted for verifying. So the rationality of the final assembly clearance of steam seal was ensured.

Selection of series reactance rate of capacitor in large substation

TANG Huimin

2013, 35(9): 32-35.

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Abstract:Due to that there is harmonic in power grid, the harmonic amplification may occur in parallel compensation capacitor of substation under certain operation mode. According to the configuration of the capacitor for the third main transformer of 500kV Yandu substation, the general process of parallel compensation capacitor design was proposed. Depending on the rational selection of the series reactance rate, the harmonic amplification in capacitor branch can be avoided, and it can be ensured that the overvoltage and the surge excitation current on the capacitor to be limited in permissible range. The allowed grouping switch mode of the capacitors in the substation with different series reactance rate was discussed too in this paper.

Analysis on reasons of load shedding of 600MW generator and countermeasures 

WANG Guilai, TANG Lu

2013, 35(9): 36-38.

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Abstract:The source injection type stator grounded fault protection in the protection cabinet A, B of Generator No.5 in Goupitan Hydropower Plant tripped, and this caused active load of the plant 527.6MW to be shed. The Bphase outlet potential transformer of the generator No.5 had been disassembled and tested, and it was found out that the main reason of load shedding of the 600MW generator is the damage of the potential transformer. The relevant countermeasures were proposed, which laid a solid foundation for the fault treatment.

Analysis on reasons of incorrect tripping of 600 MW unit REG670 rotator grounding protection

SUN Jing

2013, 35(9): 39-40.

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Abstract:The incorrect tripping problem of REG670 rotator grounding protection of 600MW unit in Huadian International Zouxian Power Plant was analyzed. It was excluded that the incorrect tripping may be caused by harmonic, and the actual reason of incorrect tripping was found, which is that the rated value of the analog current channel of REG670 for rotator grounding protection is selected to be 5A. The solving methods of the incorrect tripping of REG670 rotator grounding protection were proposed.

Analysis on reasons of larger quantity of slag discharge of medium speed mill in power plant and treatment

GUO Hongyi

2013, 35(9): 41-43.

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Abstract:Aiming at larger quantity of slag discharge of the medium speed mill in a power plant, the constituents of the pebble coal were introduced. According to the working principle of the mill, the reasons of larger quantity of its slag discharge were analyzed. The concrete measures for preventing large quantity of slag discharge of the mill were put forward.

Innovative management of first domestic pumped storage power station during commissioning period

KE Zhijian

2013, 35(9): 44-46.

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Abstract:The background of the topic “Innovative management action for ensuring new facilities can be put into operation successfully” in the Anhui Xiangshuijian Pumped Storage Power Station of State Grid was introduced. The management features and the innovation points were analyzed. The implementation steps of the innovative management of the first domestic pumped storage power station during commissioning period were expounded. After the innovative management was implemented, four units of the power station were put into operation successfully and ahead of time, and the startup success rate of the power generation units and the water pumps is 98%.

Analysis on variable frequency reformation of condensate pump of 2×350MW unit

WEI Xiaofeng 1, HU Xuejun 2

2013, 35(9): 47-48.

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Abstract:Taking the 2×350MW unit of Hejin Power Generation Branch of Shanxi Zhangze Power Company Limited as example, the application of domestic highvoltage variable frequency speed control system in condensate pump was introduced. The economic efficiencies of the unit before and after reformation were compared and analyzed. The conclusion is that the energysaving reformation based on highvoltage variable frequency speed control technology is feasible, and the economic benefit of the reformation is remarkable.

Application of limited grip strength suspension clamp in transmission line

LI Hanchang

2013, 35(9): 49-51.

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Abstract:In order to avoid the deformation or collapse of the towers in transmission line caused by unbalanced longitudinal tension above allowable value, it is required that when the grip strength of the suspension clamp on the wire reach certain value, the clamp can loose the wire automatically. According to the requirement of the minimum grip strength and the maximum grip strength of the suspension clamp, a limited grip strength suspension clamp was designed. The technical and environmental factors influencing on the suspension clamp were expounded, and the application of the limited grip strength suspension clamp was analyzed.

Study on relationships between payment of fuels, heat rate and coal consumption in the oversea projects

CHEN Wei

2013, 35(9): 52-57.

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Abstract:When the domestic power generation groups invest in oversea power plant construction, the heat rate negotiation is an important part of the power purchase agreement (PPA), and it will influence on the investment income directly. The process flow and the key points of PPA negotiation were introduced. It was pointed out that the fluctuation of the coal price, the higher calorific value of the coal and the actual coal consumption are the factors influencing on the fuel payment, and the heat rate and the coal consumption will influence on the unit yield. According to the analysis on the typical working condition and the balance point, the counteractions of the heat rate and the coal consumption to the fuel payment were revealed further. The advantages and disadvantages of the heat rate and the fuel payment clauses in contracts of power plant B and power plant C in Indonesia were compared, and the control measures of the process key points of the design, the supervision of manufacturing, the construction and the commissioning were put forward, which provide reference for domestic power generation groups to invest in oversea power plant construction.

Study on preliminary evaluation method of benefit of steam seal reformation

GAO Dengpan，LIU An

2013, 35(9): 58-60.

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Abstract:The as accurate as possible preliminary evaluation of the reformation effect of the turbine steam seal is the precondition for formulating a scientific reformation scheme of steam seal of certain unit. The preliminary evaluation method of benefit of steam seal reformation was introduced. The characteristics of various preliminary evaluation methods were analyzed. The problems needing attention in preliminary evaluation of reformation effects were pointed out.

Analysis on influence of addition of organic acid on dissolution performance of limestone

GAO Zhenglai, XIN Xiaoying, JI Haihong, ZHU Yue, HE Sheng

2013, 35(9): 61-63.

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Abstract:The influence of addition of different organic acid on dissolution rate of limestone was analyzed. To add four kinds of organic acid can increase dissolution rate of the limestone. The influence of adding the four kinds of organic acid on the pH value of the limestone slurry was measured. The measurement result shows that the organic acid can stabilize the pH value of the limestone slurry.

Application of JTECH ammonia desulphurization technology in power plant boiler

DU Bo

2013, 35(9): 64-66.

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Abstract:The characteristics of JTECH streamer corona ammonia desulphurization technology were introduced. The mechanism, principle and process flow of JTECH streamer corona ammonia desulphurization technology were expounded. The practical application result shows that the desulphurization efficiency of this technology is greater than 98%, the ammonium sulfite oxidation ratio is greater than 98%, the ammonia mass concentration in outlet is lower than 8mg/m3, and there is not entrapped ammonium salt in the output flue gas. The problems of the conventional ammonia desulphurization, which include the entrapped water and ammonium sulfate and aerosol emission exceeding standard, were solved thoroughly by application of this technology in power industry.

Instance analysis on reformation of SCR flue gas deNOx system

CHEN Anxin, ZHANG Junmei

2013, 35(9): 67-69.

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Abstract:The flue gas deNOx process of thermal power plant by selective catalytic reduction (SCR) method was introduced. Combining with the reformation project of the SCR flue gas deNOx system of a 600MW unit, the characteristics and process flow of the SCR flue gas deNOx system with urea used as denitrifying agent were analyzed. The concrete reformation scheme was put forward, which provides a reference for design of similar project.

Optimized design of wind turbine foundation of Santanghu Wind Farm project phases II and III and IV

SUN Fengli, LI Jianbiao

2013, 35(9): 70-72.

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Abstract:Taking Santanghu Wing Farm in Hami Xinjiang as example, the general information of the whole project was introduced. The optimization process of the wind turbine foundation design for project phase II, phase III and phase IV was analyzed. The used amount of the concrete was decreased due to the optimization, and the project investment was reduced.

Design of hydraulic system used for synchronous tracking of parabolic trough heat collector of solar thermal power plant

SONG Guang

2013, 35(9): 73-75.

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Abstract:According to the requirement on high tracking precision of the parabolic trough heat collector of solar thermal power plant in tracking the sun movement synchronously, the design scheme of hydraulic system used for synchronous tracking was given. It was verified by test that the tracking precision of the system reach ±0.1°, which can meet the requirement of the parabolic trough solar thermal power generation fully.

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