6 Analysis and treatment of severe vibration during start-up of hydro-generator unit Sheng Jihong Qi Fabang Changchang Reservoir Administration Bureau, Xinchang County, Zhejiang Province Welcome (1) The pendulum fails to resolve vibration. Tune up the station station machine when the start of the severe vibration and abnormal sound. Adjustment by scraping method can be resolved. The clearance between the positive bearing and the water guide bearing makes the vibration at the time of starting and the constant sound. Q1 Changying Reservoir, Xinchang County, Zhejiang Province is the main flood control system, combined with irrigation, power generation, water supply and shipping, freshwater aquaculture and other comprehensive utilization. Large reservoir. The area of ​​rain collection is 276 km, and the total reservoir valley is 189 million m3. The Changyi Power Station is the main parameter of the Changfeng Reservoir's grade turbine. Turbine model No. 1 No. 2 machine is a mouthwash 100; No. 3 machine is a muscle 268 port 100. Design head 40,1; highest head 6; 1; minimum head 251 is called rated flow 6.738; rated power 2 generator main parameters. Generator model 2000 1 to 215 rated power 2000kW; rated voltage 6300V; rated current 229A; rated power factor 9 = 0.8 lagging.
Vibration of Unit 21 The Unit 1 has been operating safely for more than 10 years due to the strengthening of scientific management since Unit 1 was installed to generate electricity in 1979. However, in March 1996. When the operator opened the No. 1 machine guide vane, the main shaft vibrated from the start of rotation and the unit was accompanied by abnormal roar. The floor of the plant, especially the area near the No. 1 machine, has a strong sense of vibration. This vibration lasted for about 2 days after the unit returned to normal, and no vibration was observed during the rated load or even during the overload 22001 evaluation.
Since then. The unit vibration must occur every time the machine is turned on. In 1996 1998, various methods such as scraping the insulation pad were tried but none of them solved the problem.
3 Analysis and Testing of Causes of Vibration The vibration of hydraulic generating units may have mechanical hydraulic and electrical reasons. Because the vibration of Unit 1 occurred just after starting 0, no excitation current was input at this time. No more load. So you can eliminate the electrical vibration factors.
The start test was conducted at high head and low head, respectively. The vibration was found to be still the same, indicating that the water head is not the influencing factor. It was originally suspected that the thrust of the No. 1 unit caused vibration and abnormal sound due to the dry friction of the thrust tile.
However, in 1996 and 1998, during the inspection and repair of the year, it was found that the thrust tile face was smooth and clean, there was no obvious abrasion, and there was no burning of tiles. So this factor can be ruled out.
The collision between the mirror plate and the seal support body and the friction between the stationary parts of the seal support body can cause vibration. However, remove the spindle seal when servicing. No traces of friction were found between the mirror plate and the adjacent seal support. and so. Unit vibration is also not caused by the spindle seal.
4 Causes and Treatment of Unit Vibration Through the above analysis and inspection, several possibilities were eliminated. In the annual overhaul of 1998, the value of each guide bearing and labyrinth clearance was measured. By adjusting the clearance between the water guide bearing and the upper guide bearing to adjust the slewing degree of the unit, it completely solved the problem that the No. 1 machine was violently accompanied with abnormal sound when it was turned on.
The adjustment of the upper guide bearing clearance is achieved by adjusting the support bolts.
Water guide bearings wear due to years of operation. The gap value is larger. So use the method of grinding the joint surface to adjust the bearing gap. Although this treatment has a certain influence on the roundness of the bearing pad, the allowable value range of the water guide bearing clearance is larger than that of the upper guide bearing.
Therefore, this treatment will not affect the formation of oil and oil film on water guide bearings.
Before and after the adjustment of the upper guide and water guide bearing clearance bilaterally, such as the bearing name adjustment direction adjustment before adjustment after the original design allowable value guide + sense direction + direction water guide + sense direction +7 direction from 1 can be seen before the adjustment of the upper guide water guide The clearance of the bearing is obviously larger than the set value and the gap size is known. This phase is not called, on the axis, concentric, especially on the tile. Because close to the thrust of the tile, due to the amplification effect similar to the lever. When the gap between the upper guide shoes increases, the degree of clearance between the crown of the runner and the labyrinth between the lower ring and the bottom ring of the top cover has a great influence. Due to the existence of excessive clearance and misalignment, when the unit is just started, the temporarily unstable water flow in the circumferential direction of the runner can easily cause the runner to be eccentrically attached to the main shaft. Turn to the side. This causes the upper crown of the wheel to collide instantaneously with the top cover because the gap between the lower ring and the bottom ring is larger than the gap between the upper crown and the top cap, and the collision between the lower ring and the bottom ring is not likely at the same time due to the inclination of the main shaft. Instantaneous friction occurs between the spindle and the guide bearing bush. Therefore, the main unit of the vibration when the unit is turned on, the main unit is used to seal the tenderness and tenderness of the mechanical welding spring, Teng, Midu, private shoots and wormwood, and the use of PMCS in the computer protection system of the dam power station Lin Zhandong, Liu Jiangxiao, Shenzhen City, Guangdong Province, China Deep Electronics Technology Co., Ltd. 5,1 applications, thereby enhancing the system's security management of data protection.
1 Project Introduction The damhead hydropower station is located in the village of Bingcun, Mei County, Guangdong Province. The site of the dam is located at the mouth of Lishuikang, which is located 0.6 north of the village of Batou in the village of Chongcun in the lower reaches of the Grottoes. The maximum head of 8.45 average head is 7.6 minimum head 3.451 to take a low head daily adjustment of radial power station, installed three 6000 bulb-type bulb flow machine 1. The total installed capacity of 18 said that the station's annual interest hours rose to 3173. The average power generation capacity is 50.16 million kWk. The outgoing voltage level is 0. Access to the Yantai Tyre Factory 10 1 substation through the return line.
In the project of the Mahe project, a computer-reserved rabbit protection device was used to train the lines; two main transformers; three generators including excitation change; two factory transformers; two near-field transformers 510 near the power supply line; The equipment used laughter country general electric apparatus; 10 public protection devices.æ±´ Pass, 1 generation, 0, 48 on the host computer for configuration and real-time monitoring.
2PMCS principle and function introduction; to 1 mountain 4, divide hunger into electricity bamboo plumbing equipment. The network that will connect to the host will be set up. , 08, server software and customer application software, the following will be a simple introduction to the various parts of each of the following ten principles we talk about the next scare to discuss, is 01; also the abbreviation of 31 is kind of small;, 1 do not. It allows a corpse, 8 under development program to share data and instructions with other programs, 00 can establish a customer service relationship between two concurrently running programs.
The number of applications that require data to be accepted is called the client, allowing the application to receive data from the device or device of the application. It communicates directly with other, elbows to applications. Such as the formation of a powerful and highly adaptable power management system, in the 8 continents or, plus the power management network and support, 0 for the display. The analysis and control should be between 1 soft tick 10 sink. 1.1.1 plays the role of bridges and bonds.
The gap at the turn of the labyrinth ring became even when it was turned on. So that the gap through the labyrinth is small. The pressure pulsation of the water at the labyrinth ring weakened, and the violent vibration disappeared. When turned off, it was different from the situation at the time of starting. The vanes are gradually closed to zero. Unit breakdown. The speed decreases slowly. At this time, the high pressure water in the runner chamber and the outside is cut off, so even if the pressure drop in the labyrinth exists, it is not very large. And the oil film of the guide bearing was not completely destroyed until the unit completely stopped. Can still withstand a given radial force.
Therefore, when the power is turned off, it will not cause severe vibration, and the clearance value of the upper guide bearing and the water guide bearing can be adjusted. Make the guide bearing misalignment be solved. When the unit was turned on, the vibration was severe and accompanied by an abnormal sound. The root 1 unit was able to pull it safely. C Author brief introduction Sheng Jihong. male. 28 years old. Assistant Engineer
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