Integrated Intelligent Energy

Vibration fault diagnosis of turbine based on wavelet analysis

HOU Naiming;DING Changfu

2009, 31(11): 1-2.

Asbtract ( 1573 )

Related Articles | Metrics

Fault diagnosis of turbogenerator was investigated based on wavelet transform. The theories of Fourier transform and wavelet analysis were introduced. The advantages of wavelet transform in locating of vibration signal composition were discussed comparing with the Fourier analysis and verified by simulation signal. By using db7 wavelet, the signal was be resolved into 6 layers, and the accurate position of discontinuity was appeared clearly in the detail of resolved signal. The analysis result shows that if the characteristics of turbine vibration fault signal are clearly known, then the wavelet analysis can be used effectively in turbine fault diagnosis.

Economical analysis of twospeed reformation and parallel operation of water circulating pumps

ZHANG Ying

2009, 31(11): 3-5.

Asbtract ( 1263 )

Related Articles | Metrics

The working principle of water circulating pumps, which had been twospeed reformed and operate in parallel mode, was theoretically analyzed. Combining with the performance test of the twospeed water circulating pumps in parallel operation, by using the minimum annual operation expenses method, the economical efficiencies of three parallel operation schemes were compared, providing a foundation for energysaving operation of water circulating pumps.

Optimization of furnace negative pressure automatic control of Labuhan Angin Power Plant in Indonesia

CHEN Xiaofeng;WANG Meng;YANG Baowei

2009, 31(11): 6-8.

Asbtract ( 1186 )

Related Articles | Metrics

Several difficult points during putting the furnace negative pressure automation control of Labuhan Angin Power Plant in Indonesia into operation were analyzed. The field control devices and the negative pressure automation logic in DCS had been optimized. Thus the difficult problems had been solved successfully, and the system stood the test of the RB experiment of induced draft fan and primary fan.

The influence of firing poorgrade coal on boiler and relevant countermeasures

DENG Chaoxu;ZHANG Mengmeng

2009, 31(11): 9-11.

Asbtract ( 1271 )

Related Articles | Metrics

For the past few years, along with domestic energy source demands increasing, the supplydemand equivalence of coal for power generation was broken, and the coal supply of power generation enterprises became diversified. The coal quality became lower, the coal rank became complex, the control difficulty of asfired coal quality was increased, and the equipment defects caused by the poor coal quality obviously increased. Combining with the practical conditions of #3 and #4 units in Pingdingshan Yaomeng Power Generation Corporation Limited, the influences of firing poorgrade coal on safety and economical effici

Deviation analysis of connected tube type twocolor mica water gauge for steam drum

LIU Junguo

2009, 31(11): 12-14.

Asbtract ( 1382 )

Related Articles | Metrics

The reasons, which caused the deviation of the connected tube type two color mica water gauge of #6 unit steam drum in Mudanjiang Second Power Plant of Huadian Energy Source Corporation Limited, were analyzed. Aiming at the factors influencing the indicated value of the water gauge, the water level measurement system reformation measures were put forward.

The cause analysis and treatment of larger hydrogen humidity of generator

Lv Pengfei

2009, 31(11): 15-17.

Asbtract ( 1299 )

Related Articles | Metrics

The harm of larger hydrogen humidity of generators No.1 and No.2 of a power plant was expounded. The cause of larger hydrogen humidity was found and analyzed. The prevention measures were proposed, then, the hydrogen humidity had been stabilized in qualified range.

Discussion of heat exchange plate microdistortion characteristics of plate exchanger

YU Lifan;WU Shengfa

2009, 31(11): 18-19.

Asbtract ( 1577 )

Related Articles | Metrics

The operating principle of plate exchanger was introduced. The microdistortion characteristic of the heat exchange plate was analyzed which was ignored easily. The microdistortion means that the pressure variation on one side of exchanger will influence the shape of the heat exchange plate, and which causes the volume inside the exchanger between the both side to vary and the pressure on another side of the exchanger to fluctuate. The practical example of microdistortion was discussed, and relevant handling measure was given.

Application of DKT speed governor in cascade hydropower stations

YU Huiqing;ZHU Yueliang

2009, 31(11): 20-22.

Asbtract ( 1962 )

Related Articles | Metrics

The main functions and characteristics of DKT type, AC servo motor controlled, programmable speed governor were introduced, and its application in hydropower station was presented. Its defects were analyzed, and improving suggestion was put forward.

Application of overhauling proceduring control management system

YAN Zhongjun;WANG Rui

2009, 31(11): 23-25.

Asbtract ( 1473 )

Related Articles | Metrics

The development environment, the application of function modules and work flow of overhauling management system last developed by FAM developing group of Huadian International Power Corporation Limited were introduced. The system had been trial applied in Anhui Huadian Suzhou Power Generation Corporation Limited. The gains in depth of comprehension obtained in application process were summarized. Aiming at present application situation of the software, some improving suggestions were put forward providing reference for popularization of this management system in other power plants.

Reason analysis and prevention measures of boiler slagging in 1000MW unit

CHEN Xiaoan

2009, 31(11): 26-29.

Asbtract ( 1180 )

Related Articles | Metrics

The slag chunks were formed and fell off frequently in the boiler of 1000MW unit of Zouxian Power Plant of Huadian Power International Corporation Limited, and these caused some accidents such as the emergency door of the slagoff machine was opened by bulge force, the water seal of boiler was lost, etc. After reducing load at night, the sound had be often listened which was caused by big slag chunks falling, and obvious vibration can be felt in central control room, and the safety and stable operation of the unit had been influenced seriously. Combining with practical situation, the slagging reasons of the 1000MW boiler were analyzed, and concrete preventing measures were proposed.

Analysis of ultrasonic welding detection for tube with minor diameter

WANG Xinyang

2009, 31(11): 30-31.

Asbtract ( 1220 )

Related Articles | Metrics

There are some shortcomings in application of ultrasonic probe with single crystal chip, large refraction angle and short cutting edge in welding fault detection for tubes with minor diameter and thin wall (4～8mm) such as the incorrect positioning, the difficulty to determine on the nature of the defect and the lower defect resolution. These problems were analyzed and researched, and relevant measures were formulated. So the welding fault defecting method for tubes with minor diameter and thin wall become more accurate, the escaping from detection or wrong decision were avoided, and the practical application effect was remarkable.

The corrosion mechanism and protection of CS pipes of cooling water system in coastal power plant

ZENG Linggang

2009, 31(11): 32-33.

Asbtract ( 1415 )

Related Articles | Metrics

The CS pipes of cooling water system of coastal power plant are installed in flowing sea water and mainly suffer the impingement corrosion, the galvanic corrosion and the crevice corrosion. The corrosion of CS pipes is affected by the velocity of flow, the degree of turbulence and the sediment concentration of the sea water. Aiming at the major factors of the pipe corrosion, some protection measures, such as the rational arrangement of the pipeline, the inside rubber coat and cathode protection, would effectively prevent corrosion of the pipes, ensure the safety operation of the power plant, eliminate the accident potential and reduce the operation cost.

Analysis and treatment of the discharge fault of 500kV main transformer of a pumped storage power station

CHEN Jiehua;LIN Chunyao;YAO Senjing

2009, 31(11): 34-35.

Asbtract ( 1339 )

Related Articles | Metrics

The singlephase earth fault occurred in operation of 500kV main transformer in a pumped storage power station. By inspection of the inner parts of the transformer and analysis, it is found that a discharge fault in long oil gaps between the grading ring in oil of highvoltage bushing and the yoke was occurred. Through repairing and treatment, the discharge fault of the transformer had been eliminated basically.

Treatment of main transformer oil reservoir leakage in 600MW unit

XUE Ruifeng

2009, 31(11): 36-38.

Asbtract ( 1869 )

Related Articles | Metrics

There was welding seam leakage fault in No.1 unit main transformer Cphase oil reservoir of Inner Mongolia Huadian Baotou Power Generation Corporation Limited. When No.1 unit was overhauled, the gas cutting and repair welding with oil filled for the oil reservoir had been carried out, and the process was introduced in this paper. Because of the field treatment with oil filled, the tedious work of the oil discharging, the cover hanging and others were avoided, and the high cost for returning the main transformer to the manufacturer to repair was eliminated, and the repair period also was shortened.

Technical analysis of 10kV transmission line status monitoring system

SHEN Yiming

2009, 31(11): 39-41.

Asbtract ( 1233 )

Related Articles | Metrics

The operation status of highvoltage transmission line directly influence on safety and efficiency of whole power grid. The monitoring methods of transmission line status monitoring system were summarized and deduced, hoping to provide reference for subsequent design work.

Improvement measures of motor comprehensive protection devices

ZHANG Tao;ZHAO Liang;ZENG Fanhui

2009, 31(11): 42-44.

Asbtract ( 1172 )

Related Articles | Metrics

Due to the service period was too long and the elements were aged seriously, the maloperation of MPR40C type motor comprehensive protection device were occurred repeatedly and influenced on the reliability of auxiliary power. It will need a lot of funds and longer construction period to replace all existing motor comprehensive devices. The maloperation reasons of motor comprehensive protection devices were investigated and analyzed, and relevant improvement methods were put forward. The measures, such as replacing few elements and adjustment the protection characteristics of the devices, were adopted, the problem of protection device maloperation was solved fundamentally and replacing the protection devices was not needed.

Treatment measures for frequently startup and stop of oil pump in hydraulic turbine governor

CHEN Wei

2009, 31(11): 45-46.

Asbtract ( 1926 )

Related Articles | Metrics

In a hydropower station of Huadian Fujian Shaxian Chengguan Hydroelectric Corporation Limited, the governor oil pump startedup and shut down frequently while the governor was outage state or worked without adjusted load, and this may be caused by fault existed in the governor system. This problem was analyzed, some effects were adopted, and the fault was eliminated basically.

Treatment of overproof dissolved oxygen in condensate of 1000MW unit at lowload operation

LIN Fuhai;WANG Wanming;ZHAI Lei

2009, 31(11): 47-49.

Asbtract ( 1283 )

Related Articles | Metrics

The dissolved oxygen in the condensing water of 1000MW unit at lowload operation exceeded the standard value. Combining with the practical status of the unit, the whole checkup process of overproof dissolved oxygen in condensate was described in detail. The reasons caused the standard value exceeded were analyzed, the proper measures were worked out, and the problem of overproof dissolved oxygen in condensate was solved thoroughly. This provides reference for solving the similar problems of the similar units.

Overview of online monitoring technology of power transformer oil chromatogram

MENG Yuanyuan;LIU Wei

2009, 31(11): 50-52.

Asbtract ( 1241 )

Related Articles | Metrics

The principles of various online monitoring devices of power transformer oil chromatogram were introduced. The two key technologies of multiple components online monitoring device, which are oil and gas separation and gaseous mixture separation and detection, were introduced emphatically. In the end, the author proposed to construct an online monitoring system of oil chromatogram for large power transformer.

The reason analysis about output transmission line breaking fault in a hydropower plant and countermeasures

LUO Hexu

2009, 31(11): 53-55.

Asbtract ( 1367 )

Related Articles | Metrics

According to the investigation of 110kV output transmission line breaking fault in Baisha Hydropower Plant, the fault process was introduced, the main reasons of line breaking were analyzed, and the probability of lightning strike of two wires simultaneously in 30s after discharge caused by windage yaw was discussed. It is pointed out that must adopt relevant prevention measures based on the microtopography, the microclimate of the transmission line location and various disastercausing factors.

Treatment of the transformer ironcore multipoint grounding fault

MA Yingjie

2009, 31(11): 56-57.

Asbtract ( 1902 )

Related Articles | Metrics

A fault of transformer ironcore multipoint grounding was introduced. The fault was be confirmed by three ratios method. Due to that the transformer can not outage, the treatment method of adding currentlimiting resistor was adopted. Then, not only the growth of the grounding fault was be inhibited, but also a nonplanned shutdown accident was be avoided.

Feasibility analysis of introduce and construction 1300MW unit and unit optimization

LI Xiangling

2009, 31(11): 58-60.

Asbtract ( 1214 )

Related Articles | Metrics

China is one of few countries in the world main power production of which is thermal power generation. China is rich in coal resource, and this determines that in longer term the main installed units of our country will be thermal power units. But the power source structure is not all rational. Aiming at this situation, hereafter, in development of electric power construction, must optimize the thermal power generation development, must vigorously develop the clean power generation technology, promote the integration construction of coal, electricity and harbor, and in coastal areas, which is rich in water and poor in coal, must introduce and construct 1300MW unit, and introduce the optimal ultrasupercritical single reheat generation technology, and those will helpful for realization of sustainable development of domestic electric construction.

Treatment of insulation quality lowering of TRT generator excitation winding

ZHANG Min

2009, 31(11): 61-62.

Asbtract ( 1293 )

Related Articles | Metrics

The reason of insulation quality lowering of 8MW TRT generator excitation winding in Nanchang Changli Iron and Steel Corporation Limited was analyzed. The fault reason was found, and the fault had been treated, and some concrete prevention measures were proposed.

Analysis of overtemperature of metal pipe wall in 850t/h boiler and operation control measures

SHI Daokong

2009, 31(11): 62-63.

Asbtract ( 1530 )

Related Articles | Metrics

According to the practical operation condition and the structure of the 850t/h boiler of Douhe Power Plant, the overtemperature reason of metal pipe wall of the boiler was analyzed, and the control measures should be adopted in operation were put forward. It is pointed that to control the gas temperature of furnace outlet and to eliminate the furnace heat deviation are key measures for eliminating the overtemperature of metal pipe wall of the boiler.

Analysis of an incorrect operation of 500kV line reclosing device and prevention method

LI Yulei;LI Xiaoming;TANG Yi;YAN Lixiong

2009, 31(11): 64-66.

Asbtract ( 1531 )

Related Articles | Metrics

The automatic reclosing technology is an effective measure to guarantee the safety power supply and stable operation of power system, and has been widely used in electric power system domestic and abroad. A reclosing incorrect operation accident occurred in a 500kV line of Central China Power Grid was introduced, in which the reclosing device of one side of the line had reclosed successfully, but the reclosing device of other side of the line had operated incorrectly and the breaker tripped three times. Through the investigation and analysis of this accident, it is shown that for trying transmission of new line or the line in which the protection system was reformed, in order to inspect the correctness of unit functions and circuit coordination, the prior complete set test of protection devices must follow the mode of simulating same step action of two sets of protection devices, so as to avoid the emergence of such accident or other faults.

Reason analysis of tube cracking of boiler superheater of refusefired power plant and countermeasures

YE Mingbin;JIN Yubin

2009, 31(11): 67-68.

Asbtract ( 1281 )

Related Articles | Metrics

Several bended tubes of #1 boiler second stage superheater of the Xiamen Houkeng Refusefired Power Plant were failed due to cracking during operation. The reason of tube cracking was analyzed, and the feasible solving scheme was proposed and accomplished; then similar fault was avoided effectively. So the safety operation of boiler had been ensured.

Analysis about an event of protective action of generatortransformer protection

ZHANG Qi;WANG Xin

2009, 31(11): 69-71.

Asbtract ( 1429 )

Related Articles | Metrics

Taking once protective action of differential protection of DGT801 digital generatortransformer protection device in a power plant 135MW unit as example, the reason of protective action of differential protection in this time was analyzed. According to the data of fault record, the action characteristics in the fault process were analyzed, and aiming at the protection action in this event, some suggestions were proposed.

Application of fiberglass reinforced plastics flue in flue gas cooling tower

JIANG Dagang

2009, 31(11): 72-76.

Asbtract ( 1937 )

Related Articles | Metrics

The development of the flue gas cooling tower at home and abroad was introduced. The technology process of the flue gas cooling tower and the design parameters of the flue gas of 2×350MW heat supply units in Huadian Tianjin Junliangcheng Power Generation Corporation Limited project phase V were discoursed. The selection of the fiberglass reinforced plastics flue, the performance of the fiberglass reinforced plastics flue and the technology requirement for fiberglass reinforced plastics flue manufacturing were expounded emphatically. The fiberglass reinforced plastics flue application experience of Huadian Tianjin Junliangcheng Power Generation Corporation Limited can be used as reference for the power plants using similar fiberglass reinforced plastics flue in their cooling tower.

Overview of linkage model of timeofuse electricity price between generating and retail sides

YU Dongxian;;LEI Xia;FENG Jie

2009, 31(11): 77-80.

Asbtract ( 1478 )

Related Articles | Metrics

The importance of linkage of timeofuse electricity price between generating side and retail side was introduced. Several domestic common linkage models were analyzed. Through relevant comparison and analysis, the development trend of linkage model of electricity price was pointed out.

Table of Content