Hydrogenerator set swing increase treatment and reasons for discussion Xianqi Baozhusi Hydropower Construction Administration, Guangyuan 1 Overview Baozhusi Hydropower Plant is a dam-type factory building with a stand-alone capacity of 175.1. The total installed capacity test is 700 waterwheels. The unit is produced by Dongfang Motor Co., Ltd., the unit is equipped with a bearing bearing thrust bearing water guide bearing, the turbine model is 089 people 51 design head 844 catch, rated flow 239.9 rated speed 136 4 plant muscle shear 7-foot turbine total axial thrust 80 Vision 1 gamma. The water-conducting bearing adopts the oil-immersed self-circulating non-concentric segmented tile bearing. The bearing of the bearing is a vertical shaft and a half-umbrella structure. The upper bearing is installed in the frame, the thrust bearing is installed on the lower frame, and the thrust bearing is mounted on the lower frame. Cooling and collecting external oil pump External circulation cooling mode Generator No. 5 factory 175441035, rated power 200000175000 4 suspected generator rotor flying torque 0, 2 not less than 30 thrust bearing using plastic tile and elastic support with tray support The bearing and oil sump device are placed on the lower frame and placed in the upper body of the frame. The guide bearing is supported by a wedge plate. A total of 12 bearing pads. In the 1 rack core body, there are 8 warping styles, and the hot water 2 asks the day. The No.3 unit of Baozhusi Hydropower Plant carries 160 load-like operation. At around 18 o'clock, the operating personnel found the pendulum of the No. 3 machine. The degree is abnormally increased, and the generator shaft has intermittent friction with the sealing groove of the oil guiding groove. Immediate shutdown in order to clarify the cause of the failure. On September 13, the technicians in the factory analyzed the operation of the No. 3 machine. Decided to re-open the No. 3 unit for the inspection of the no-load condition and the measurement results. The swing of the guide is obviously increased, and the +1+ direction swing is 157 or more. The measured swing is the non-finished surface. With 175 ç–‹ ç–‹ + å°¤ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Basically, the accident was followed by the 3 å…® machine in August 1998, and the secondary swing was sudden. The inspection and test of the human towel were limited due to the limited repair time. In order to restore the standby unit as soon as possible, the Baozhusi Hydropower Plant After a comprehensive analysis of the operation of Unit 3, the technical team began to work from the following aspects.
31 Appearance inspection First, it was checked that the shear pins of the 12 elastic pillars of the upper frame were not cut, the concrete around the elastic pillars was intact, and the foundation bolts of the elastic pillars were not loose. The 1st end shaft is connected to the bolt and the core is welded. The fixed ground screw is especially loose, the base plate connecting bolts and other spot welding are intact, and the joint surface joint gap is normal. Secondly, the stator wire rubber poles were also inspected, and no abnormalities were found. 1 32 Electrical balance check The electrical balance check included the inspection of the stator rotor and the generator air gap. No abnormalities were found by checking the appearance of the stator bars. Excluding the part of the bar and the wire rod caused by the imbalance of the magnetic pull force caused the increase of the pendulum of the rotor, the possibility of checking the rotor magnetic pole key, no looseness was found, no abnormal phenomenon was found in the fan yoke, and the stator rotor of the generator was also found. The air gap between the upper ends is measured non-dynamically, the air gap is basically uniform, and the difference between the air gap and the average air gap does not exceed 1 of the average air gap value. It can be seen from the above visual inspection and testing. It is possible to preliminarily exclude the magnetic pull force + balance and cause the increase in the swing of the unit.
Inspection of the 33-conductor bearing After inspection and inspection of the oil-conducting tank cover, it was found that the friction of the oil-seal sealing cap and the paint on the cover plate were partially burnt due to the friction between the generator shaft and the sealing cap in the oil guiding groove. The oil sump cover is not deformed.
Then, the gap of the hair guide tile was measured, and the double-side gap 1 of the hair guide tile was obvious. It can be seen from 1 that the minimum double-side gap of the hair guide tile is 100.5 watts and watts, and the maximum double-side gap of the hair guide tile is 1503. According to the installation specifications, the wattage and the 9th watt shall be the double-sided clearance of the guide bush. The gap between the 6 and 64 claws shall be abnormal for the gap between the guide bush and the large-scale situation. Part of the wedge plate has damage, the 10077 high ball head has been basically flattened, 12 pieces of support are deformed and partially torn. For this situation, the factory decided to damage the damaged support wedge plate ball head insulation pad. Replacement, requires the Oriental Machine Factory to re-process the parts. Ensure that the repair 1 is successfully completed. The gap between the water level and the flow component is checked. The inner and outer sealing plates of the water guiding oil tank are opened, and the gap between the water guiding bushes is measured. The double side gap of the water guiding tile is normal, and the gap of the oil guiding ring is 060, 7 or so. Basically, the volute enters the hole door, the flow-through parts are free of any debris, the water-conduit cones are finished, and no parts fall off. In addition, the gap between the upper leakage ring and the top cover is measured, and the leakage is stopped. The gap between the ring and the top cover is basically uniform, meeting the requirements of the hydro-generator unit installation manual hereinafter referred to as the design design gap 195 200. Through the above inspection, no abnormal phenomenon is found, saying that the unit water guide and over-current parts are not issued, 35 Check the force of the thrust tile. Open the thrust oil groove 14±, the cover plate, and check the appearance of the elastic oil tank without sweat. If the elastic oil tank is not leaky, the force of the detection force 1 is uniform. The elastic tank cannot push the large shaft to the center under the elastic condition, and the 14 protective covers of the elastic oil tank are dropped, the elastic oil tank is turned into a steel fuel tank, and then the unit is pushed to the center. The variable oil tank is an elastic oil machine that holds the water guide bush and the guide bush in the =1 side, and the clearance of the water guide bush after the hug is 0 02005, the measuring frame of the thrust tile is installed in advance. When the top rotor or the falling rotor is measured, the amount of expansion and contraction of the elastic oil tank at each tile is measured, and the thrust tile is uniformly stressed. The difference between the maximum value and the minimum value of the compression amount of the elastic oil tank substantially conforms to the requirements of the specification, and the bearing water guide bearing is issued through the electrical part. The overall inspection of the parts such as the overcurrent parts and the elastic oil tanks is considered to be due to the fact that the increase in the swing of the No. 3 unit is caused by the damage of the bearing parts caused by the damage of the bearing parts of the bearing, which causes the gap of the bearing to become abnormally large, resulting in In the case of the unit, the situation is limited. The 4 process is carried out with the ring gap as the heart of the water wheel, and the large axis of the unit is pushed to the center, so that the gap between the turbine labyrinth ring and the top cover is substantially uniform. The gap of the measuring oil ring is basically uniform. The air gap of the generator is also checked to meet the installation specifications. The water guiding bush is held in the corresponding four directions, and the water guiding gap is adjusted to 030032 claws. After the gap is adjusted, review each gap of the water guide tile to meet the requirements. During the period of re-processing with the guide tile, the hair surface of the hair guide is completely shaved to remove the burrs and burnout points on the tile surface. At the same time, the jaws of the mold plate are removed, and the wedges of the wedge plate 1 and the pads of the plate are honed. Adjust the hairline gap to 0. After adjusting the clearance of all water guide tiles, check each water guide tile clearance to meet the requirements of cleaning the water guide thrust to send the oil groove, restore the large oil tank cover, and refuel the large oil tank to the normal oil level. The top rotor, and finally the unit is restored to standby.
5 reasons analysis and discussion to meet the overall inspection of the hydro-generator appearance of the electric bearing bearing water-conducting bearing over-current parts and elastic fuel tanks, etc., that the No. 3 unit swing, the large original flash is derived from the bearing parts The damage caused by the damage of the bearing component causes the gap of the bearing to become abnormally large, which causes the swing of the unit. It is inevitable to recall it carefully. Unit 3 was put into operation in December 1997, August 1998. It has also been seen that the same large swing increase accident occurred in the time when the large No. 3 unit was not in operation. The No. 1 unit was put into operation earlier than the No. 3 unit, but the 7-foot guidance of the No. 1 unit was still small. The author believes that the swing of the No. 3 unit is abnormal, which is related to the unbalanced force of the rotating part of the unit. The reason for the imbalance is not only the mechanical electromagnetic water force. The size of the unit's swing is related to whether the mechanical electromagnetic hydraulics are balanced. The following is the reason for the vibration of the unit from the electromagnetic aspect of the hydraulic machine.
51 causes the cause of hydraulic imbalance, the ring gap is non-uniform; the jade force pulsation exists in the top cover and the water pipe; the operating condition of the unit deviates from the optimal working condition area; the over-flow component processing and installation and the optimal design are deviated, etc. Will cause hydraulic imbalance. If the labyrinth ring gap is not uniform, it will cause the unit to vibrate. When the volute guide vane is added and the installation is deviated, the water flow can form a uniform circulation. The non-uniform circulation of the water flow will cause the unit to rotate the sub-rotation wheel to receive unbalanced hydraulic power.
52 causes mechanical imbalance here. The mechanical imbalance is the machine. The mechanical imbalance of the rotating part, that is, the mass imbalance of the rotor and the runner. The rotor yoke is made up of laminated thin steel plates. The number of steel laminations is large, the weight between each lamination is different, the precision of lamination stacking and other factors will give the magnetic mass. Balance has an impact. In addition, there are differences between the core coils of the magnetic poles. Therefore, the mass imbalance of the rotor is inevitable. Although the runner performs static balance test before installation, it does not mean that the dynamics of the runner are balanced.
53 causes the electromagnetic force to be uneven, the cause of the non-circularity of the stator of the generator, the offset between the center of the rotor and the center of the unit are all factors that cause the electromagnetic force imbalance. Although the air gap of the generator is measured, this measurement The result is only to reverse the contract on page 102. Although any contract is difficult to achieve perfection, it is still necessary to avoid or reduce the occurrence of inconsistency and ambiguity and clearness when compiling the contract, and reduce the dispute during the execution of the contract. In view of the responsibilities and important position assigned to the engineer by the contract, the engineer who is engaged in measurement payment in the engineer 4 should be familiar with the contract terms, 1 understand the contract, actively promote and complete the work, and implement the fairness, accuracy and timeliness. There are many differences between the set of regulations on measurement payments in international contracts and the engineering measurement and payment methods used in domestic projects. The two cannot be confused. The experience gained in the management of other construction contracts is transferred to the management of this contract. Applications should consider the compatibility between them, and can not blindly set 52 paper engineers in reviewing designs and contractors Working hours, in addition to technical review, should not neglect to examine the paper from the contract point of view, to avoid the excavation section and the building infrastructure section in the excavation of the foundation of the building; 2) The project name labeling and contract provisions in the paper The definition does not match, such as the mistake of writing the anchor or steel bar as the anchor rib. Sometimes the contractor will connect the project set for the convenience of construction. The static air gap of the unit rotor is reflected on page 98. When the rotor rotates at another angle, the rotor The static air gap does not meet the requirements of the hydro-generator set safety specifications. Therefore, the necessary conditions for the magnetic tension balance 圮 the dynamic air gap of the unit meets the requirements stated above, and any of the three aspects of hydraulic machinery electromagnetic Unbalanced aspects will produce an unbalanced squeaking force. This does not affect the rotating part of the unit, and finally passes to the generator and the turbine guide bearing over time, eventually producing the relevant components of the guide bearing. Fatigue damage Since the vibration swing test has not been carried out on Unit 3, the peak-shaping frequency modulation effect of the abnormal vibration of the No. 3 unit is increased, and the No. 3 unit should be done.
53 The staff of the written record engineer shall respond to the various records and reports submitted by the contractor according to the submission, and shall submit a written evaluation in time to maintain the seriousness of the record report and check the relevant record submitted by the contractor. The viewpoint should be clear when signing, and the text should be clear. The complaints or records signed by the contractor should not be arbitrarily refused. If there are different opinions, it should be unfavorable in the record. And the payment of visas is part of the contract management. Since the measurement and payment directly involve the economic interests of both parties, the engineer as the operator of this work can be taken lightly. We must not abuse the power. We should clearly measure the division of labor for payment review and summary, and establish strict business processes. All links should clearly define responsibilities, actively cooperate, and conduct the project in a rigorous and rigorous manner. An Jianghua, 1963 , male, Luoyang, Henan, manager of the technical and commercial department of the beach construction consulting engineering company, economist, engaged in hydropower engineering technology and management.
Vibration pendulum test, the content includes variable speed variable excitation variable load +77 feet in the vertical direction of the vertical point, water point + sense +7 water side, 2 points, the stator core at the ice vibration 1 heart pass The vibration swing test is to find out the real reason for the increase of the unit's vibration swing, and solve the unit vibration completely in combination with the overhaul of the unit. The pendulum degree increased the number of people asked about his army in 1966, male, shot Hongren, director of the Baozhusi Hydropower Construction Administration Office, engineer, engaged in hydropower engineering technology management.
The Planning Committee approved the Huaneng Self-hydropower Project project on April 9th. The Provincial Planning Commission approved the report of the Mianyang City Planning and Economic Commission on the standing section of the Huoxi River Project from the Lishui Hydropower Project, and agreed to construct the Zili Hydropower Station. The details are as follows. Promote the economic development of Mianyang City, especially accelerate the poverty alleviation and poverty alleviation in the poverty-stricken mountainous areas and ethnic areas of Pingwu County, increase the power supply capacity of the province, and agree to construct the Zili Hydropower Station before the construction of the Shui Niu Jialong Reservoir Power Station. The construction scale of the power station is 130,000, and two 65,000-six ​​mixed-flow hydro-generator units are installed. The average annual power generation is 5.4 billion. The power station is a diversion-type hydropower station, and its hub is built by the underground powerhouse of the diversion tunnel. The 7-foot reservoir has a normal water storage capacity of 2,03,417. The total storage capacity is 5.08 million, and the storage capacity is 4.12 million. 3, with a daily adjustment energy, the nine reservoirs inundate the cultivated land 5075, and 7 have no migration population. The provincial power company agreed to connect the hydropower station to the power grid with the power meter No. 200086. After the power station was built, it was sent to the grid for sales and was approved. According to the price in the fourth quarter of 2000, the static investment of the power station was 551.53 million yuan, and the total dynamic investment was 60.84 million yuan. The power station is not included in the project. Net Pingwu. The power set is 0 public funds. 1 Huanengjie; 1 Hydropower has the responsibility to invest in the company and the total investment of the company is 120.4 million yuan, which is funded by its own funds in proportion to 7 and 3, respectively. Financing other than gold, China Construction Bank loan settlement of 48.14 million yuan 1 1. Our reporter Li Yanhui
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