Integrated Intelligent Energy

Analysis of related problems of auxiliary power fast switchover device

HUANG Haibo

2009, 31(9): 1-5.

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The general situation and switchover mode of auxiliary power system were introduced; the principle of auxiliary power fast switchover device was discoursed. According to the digital recorded graph of auxiliary power fast switchover device, the reason which makes the switchover mode of fast switchover device to be unstable was analyzed and summarized, and the matters needing attention in setting calculation of auxiliary power fast switchover device were put forward.

Investigation on retrofit scheme for 220kV breaker operating circuit in a certain power plant

WU Kai

2009, 31(9): 6-9.

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As the GIS overhaul progressed and the upcoming retrofit of protection device for generatortransformer unit in Dongfeng Power Plant, it is more important to synchronously implement the duple configuration of breaker operating circuit and the application of related circuits at the foundation of achieving duple configuration of main equipments. The main problems existing in 220kV breaker operating circuit of Dongfeng Power Plant, such as DC operating power supply, tripping prevention, etc., were researched, the retrofit scheme of 220kV breaker operating circuit has been investigated, and the substantial suggestions were proposed in this paper.

The connection mode regulation of auxiliary transformer in a certain hydropower station

WEN Juting;DANG Huaqiang

2009, 31(9): 10-12.

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In a hydropower station, the reliability of the auxiliary power supply must be ensured for keeping the normal operation of the power station. The No.7 auxiliary transformer of Jingpohu Hydropower Plant underground power station in cave entrance is act as important power supply of network controlled switching station. The rationality and scientific of its connection mode are very important to safety and stable operation of Jingpohu underground hydropower station. The defects of original connection mode were analyzed, and targeted reformation and regulation were carried out. The reformation brought obvious economical and social benefit.

Thinking about a line protection mal operation accident

WANG Jinjun

2009, 31(9): 13-14.

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Taking a mal function accident as instance, the function of functional contact plate of 220kV block high frequency line protection was illustrated. The faults caused by poor contact of functional contact plate were analyzed. The matters needing attention and inspection method for the maintainers and operators in their overhaul and operation were expounded.

Treatment measures of ferromagnetic resonance in 6kV auxiliary power system of power plant

ZHONG Guofang

2009, 31(9): 15-16.

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The mechanism and features of resonance in 6kV auxiliary power system of power plant were introduced. Three typical examples were selected and analyzed, the concrete measures and matters needing attention of 6kV auxiliary power system resonance were put forward, which can be used as reference for solving similar problems.

Analysis of protection incorrect operation caused by noncharging after reclosing

SHU Yishi;HU Jianli;WEI Min

2009, 31(9): 17-18.

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The protection configuration and charge control logic of LFP-901B extrahigh voltage digital fast line protection equipment were introduced. Once the charge circuit did not charge after reclose circuit act, and this caused the protection equipment act incorrectly. The fault was analyzed. The defect of charge circuit of the equipment and the hazard caused by HHKK value of zero were pointed out. Aiming at the defect of the charge circuit, some suggestions and rectification measures were put forward.

Simulation research of photovoltaic power system MPPT by dutycycle perturbation method

CAI Xiaofeng;;ZHANG Hongbo

2009, 31(9): 19-21.

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A simulation model of photovoltaic cell was introduced; the principle of the realization of MPPT by using the dutycycle perturbation method was analyzed. In order to further simplify the algorithm, the feasibility of realization of MPPT based on output current detection was analyzed; the principle of the algorithm and the realization thought were explained; the Matlab simulation model was established and simulation experiment was done. The correctness of the algorithm was proved by the simulation result.

Analysis of 390H generator condition monitor system

WANG Qiqin

2009, 31(9): 22-24.

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The classification of online insulation monitoring for generator was introduced. The composition, the working principle and the output trajectories under various overheating conditions of 390H generator condition monitor system were discoursed. The best advantage of the generator condition monitor system is that it can online monitor the overheating inside the generator body and can early forecast the generator fault. But also the generator condition monitor system has some defects such as the poor interpretation capacity, certain false alarm rate and etc.

The special problems in overhaul and maintenance of motors in 330MW thermal power

LI Jingtian

2009, 31(9): 25-30.

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In overhaul and maintenance of motors of thermal power plant, some new problems were occurred due to the technical progress, the equipment upgrading and unit capacity increasing. The damage of shaft current of heavyduty asynchronous motor and preventive pretreatment measures were introduced, the problems occurred in variable frequency operation of common three phases asynchronous motors were discoursed. The changing direction problem of heavyduty motor was predetermined, and the correctness of changing direction of motor was ensured.

Analysis of neutral point protection and operation of main transformer in power plant

YU Lifan

2009, 31(9): 31-33.

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The common three main transformer neutral point protection methods were introduced, which are gap, lightning arrester and lightning arrester combined spark gap. The principle of zero sequence overcurrent protection in transformer neutral point gap was expounded, the earthing request of main transformer neutral point was described. In order to ensure rational operation and avoid operation hidden danger, the maters needing attention in transformer neutral point operation were given in this paper.

Optimized condition maintenance and management of ultra supercritical boiler

LIU Hongguo

2009, 31(9): 34-36.

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The maintenance and management mode of the first in home 1000MW ultra supercritical boiler was introduced. The maintenance strategy for boiler body was proposed. The offline diagnosis and the online supervision were combined, and the risk management and life evaluation were carried on actively. These measures had actively promoted the optimized maintenance and management of equipment and raising the health level of the ultra supercritical boiler, and can be used as reference for other ultra supercritical boilers in equipment management.

Probe into new developing scheme of diversion type hydropower station

LUO Yisong;LUO Wenbo;YANG Yijun

2009, 31(9): 37-38.

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Taking a planned hydropower station as example, the new developing scheme of diversion type hydropower station was described briefly. The core of the new scheme is decreasing the design flow velocity in long pressure culvert to restrict the pressure of water hammer to create the condition for eliminating the surge tank (or air cushion type surge chamber); and designing the pressure tunnel to be burial more deeply to create the condition for rock land field stress to bear the internal and external load and then eliminating the tunnel lining. The theoretical foundation of new scheme of hydropower station with long pressure culvert was introduced, and the advantages and disadvantages of this scheme were analyzed.

The reason analysis of leakage at welding seam of reheater tube supports in 660MW unit

ZHANG Yujun;WANG Yuxing

2009, 31(9): 39-41.

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The reasons of leakage at welding seam of reheater tubes supports of 660MW unit in Hanfeng Power Plant of China Huaneng Group were analyzed. A reformation scheme was proposed and adopted, which advocates change the fixed support structure into movable support structure. After reformation, the leakage was not occurred again.

Probe into low tension shielding method in the leakage test of generator stator

MA Yingjie

2009, 31(9): 42-43.

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The low tension shielding method in leakage test of internal water cooled generator stator was analyzed. Referring to the advantages of high tension shielding test method, the low tension shielding method had been further improved, and the veracity of the experiment data was raised.

The energy saving reformation of condensate pump motor using low voltage variable frequency speed control technology

WU Xinfeng;Zhu Ming bo

2009, 31(9): 44-47.

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According to investigation and technical economical analysis, the reliability and economical efficiency of three energy saving reformation schemes for auxiliary high voltage motor speed control were compared. Based on this, a reformation scheme was confirmed, in which the condensate pump high voltage motor will be replaced by low voltage motor and then the low voltage variable frequency speed control technology will be adopted. The implementation condition and process of the scheme were expounded, and the energy saving and reformation effects of the reformed equipment were analyzed.

Reformation of cool panel and hot panel of superheater in circulating fluidized bed boiler

SONG Zhanbing

2009, 31(9): 48-50.

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The technical characteristics and main technical parameters of 440t/h CFB boiler No.2 in Zhongfu Electric Power Corporation were introduced. Some problems were occurred frequently in the boiler operation which includes overtemperature in cool panel and hot panel of superheater, pipe explosion and local serious wear of watercooled wall in furnace. Theses problems influenced on safety operation of unit seriously. The relevant measures were adopted, the cool panel and hot panel of superheater were reformed. After the reformation, the cool panel and hot panel of superheater operate well, and pipe explosion due to overtemperature has not occurred.

Reason analysis and treatment of deformation of high temperature reheater tube

MAO Xiaopeng;HE Weiguo

2009, 31(9): 51-52.

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The Sshaped deformation of high temperature reheater tube in No.1 boiler of Minquan Power Generation Corporation Limited of China Guodian Corporation was occurred during trial operation. The macroscopic detection and related data measurement were carried out for the deformed tubes. The analysis showed that the deformation reason of reheater tubes bundle is the expansion coefficient difference of tubes materials and the inner stress of the tubes material. Some measures were adopted such as replace certain tubes sections, tracing and supervisory, comprehensive treatment, etc. so the safety and stable operation of the high temperature reheater tubes bundle had been ensured.

Optimization and implementation of the cold state boiler water feeding scheme booster pump of turbofeed pump

YANG Jianping

2009, 31(9): 53-54.

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The parameters and system of booster pump of turbofeed pump in 600MW unit of Baotou Huadian Power Generation Corporation Limited were studied. In the startingup of No.1 unit after overhaul, the cold state boiler water feeding scheme using booster pump of turbofeed pump had been implemented. Until today, the cold state boiler water feeding scheme had been implemented in No.1 and No.2 units four times. Due to implementation of this scheme, the operation time of electric feed pump was decreased, the auxiliary power was reduced, and expected energysaving effects were achieved. The results of this scheme show that the scheme is practical and feasible.

Analysis of zinc oxide arrester living test

ZHAO Lingyan

2009, 31(9): 55-57.

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Based on analysis of the data obtained by living metering of hundreds of metal oxide arrester sets, it was shown that under operation voltage, to meter the full current and resistive current can reflect the operation status of metal oxide arrester to a certain extent.

Measures for turbogenerator set operating in safe zone in summer

SU Yuli;LI Benfeng

2009, 31(9): 58-59.

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The problems existed in summer operation of domestic 200MW aircooled unit were analyzed, and relevant measures and suggestions were put forward in order to ensure the safety, stability and economical efficiency of unit operation.

Measures of improving the unit economical efficiency after high pressure heater is outage

CHENG Hongxia;XU Xiaogang

2009, 31(9): 60-61.

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The high pressure heater often had been compelled to exit operation due to leakage, and this lead the thermal economical efficiency of power plant to be reduced. Some adjustment methods and energy saving measures under high pressure heater outage condition were summarized, which are helpful for improving the unit economical efficiency.

Reason analysis and treatment method of EH oil temperature increment

LI Ruifeng;ZHANG Shiqiang

2009, 31(9): 61-62.

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The DEH control system was adopted for the turbine of a certain power generation corporation limited, the hydraulic prepressure part of the system is EH1000 containerization feed installment. After the system was put into operation, the EH oil temperature increased abnormally, and the EH oil quality was deteriorated gradually. The abnormal phenomenon was analyzed earnestly, and based on this, the relevant treatment measures were proposed. After the treatment measures had been adopted, the phenomenon of EH oil quality deterioration had been eliminated basically.

Stall analysis and prevention measures for axialflow primary fan

XIN Changsheng

2009, 31(9): 63-64.

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The stall of axial primary air fan will harm the unit normal operation. Aiming at this problem, the occurring mechanism of stall of axial primary air fan was analyzed. The treatment methods were put forward, and effective prevention measures were adopted to make the fan operate keeping away from stall zone, and the accident had been avoided.

The reason analysis and treatment method of lower cooling efficiency in cooling tower

CAO Wei;WANG Yuhuai;CHE Fusheng;ZHANG Jingsong

2009, 31(9): 65-66.

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The reason of lower cooling efficiency of No.2 cooling tower in Hydropower Plant of Yumen Oil Field was analyzed. The treatment method was presented and adopted, then the problems existed in No.2 cooling tower operation was solved, and desired results were achieved. The treatment method can be used as reference for solving similar problems in same type of cooling tower.

Analysis of lightning prevention of primary and secondary equipments in power system

ZHANG Hong

2009, 31(9): 66-67.

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Starting from lightning prevention of primary equipment of electric power system, the relation between the lightning prevention of primary and secondary equipments was researched, and some concrete lightning protection measures were put forward. It is pointed out that to better ensure the safety and stable operation of power system only if the lightning protections of primary and secondary equipments should be formed a complete lightning protection system.

Reformation method and effects of generator ventilation system

HUANG Xiaoxia;WANG Weijiang;JIANG Cuihua

2009, 31(9): 67-68.

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The reformation reason of No.5 generator ventilation systems in Danjiangkou Hydropower Plant was expounded. The structures and operation principles before and after reformation were introduced. The operation effects before and after reformation were analyzed and compared. The problems occurred in reformation and solving method were summarized.

The influence of noncarbonate alkalinity on secondary drainage treatment by using lime

LIU Jin

2009, 31(9): 69-71.

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The alkalinity and hardness characteristics of secondary drainage from municipal sewage plant were introduced. The influence of noncarbonate alkalinity on the lime required dosage, the sulfuric acid required dosage, and the rudimental alkalinity and the hardness of the output water in lime softening treatment system was analyzed. It is pointed out that in the lime softening treatment process of secondary drainage from municipal sewage plant, the influence of noncarbonate alkalinity can not be neglected.

Feasibility analysis of using sea water as FDG process water

HUANG Tao;JIANG Jingwen

2009, 31(9): 72-74.

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According to the reaction mechanism of limestone gypsum FGD process and the requirement for process water by FGD system, the feasibility of using the sea water as the main source of FGD process water was analyzed. The two schemes, the one is to use the sea water as main process water and another is to desalt the sea water and to use the desalted water as process water, were compared in technology and economical efficiency. The result can be used as reference in limestone gypsum FGD design.

The relation between the GGH heating element and blocking in limestone based wet FGD

TAO Aiping;ZHANG Limin;YANG Zhongbiao;ZHANG Yuanming

2009, 31(9): 75-78.

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The four plate types of GasGas Heater（GGH）heating element were introduced, and the influence of different plate type on the GGH selection was analyzed. Combining with the practical operation of domestic power plant FGD system, the relation between the plate type of GGH heating element and blocking in limestonebased wet FGD system was expounded, and some suggestions for solving the blocking problem were given.

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