Analysis and treatment of severe vibration of 6 hydro-generator units when starting up Sheng Jihong seeking law in the state of Changchun Reservoir Management Bureau of Xinchang County, Zhejiang Province (1) The pendulum failed to solve the vibration problem 1 after analysis and research. It ridiculed the violent vibration of the station machine when it started up with abnormal sound. It is solved by the scraping method adjustment. The gap between the positive guide bearing and the water guide bearing makes the vibration vibrate at the start-up and the common sound. 1 Overview The Changchun Reservoir in Xinchang County, Zhejiang Province is mainly based on flood control, combined with irrigation, power generation, urban water supply, shipping, freshwater aquaculture, etc. Large reservoir. The rain-collecting area is 276km, and the total reservoir valley is 189 billion m3. Changchun Power Station is the main parameter of the Changjiang Reservoir's grade turbine. Turbine model No. 1 No. 2 is No. 100; No. 3 is muscle 268 100. Design head 40, 1; maximum head 6,1; minimum head 251 is rated flow 6.738; rated power 2 generator main parameters. The generator model is 2000 1 to 215 rated power 2000kW; rated voltage 6300V; rated current 229A; rated power factor 9 = 0.8 hysteresis.
The vibration of Unit 21 occurred. Since the installation of power generation in Unit 1 in 1979, the power station has been operating safely for more than ten years due to the strengthening of scientific management. But in March 1996. When the operator opens the guide vane of the No. 1 machine, the strong vibration of the unit occurs with the spindle from the start of rotation, accompanied by an abnormal roar. The floor of the plant is especially strong in the vicinity of the No. 1 unit. After the vibration is about to continue, the unit returns to normal, and the rated vibration or the overload is not exceeded.
Since then. The unit vibration occurred every time it was turned on. In 1996, 1998, various methods such as scraping the insulating mat were tried, but none of them was solved.
3 Analysis of vibration causes and tests for the vibration of the hydro-generator set can have mechanical hydraulic and electrical reasons. Since the vibration of Unit 1 occurred at the start of 0, there was no excitation current input. No added load. Therefore, the factors of electrical vibration can be eliminated.
Start test at high head and low head respectively. It is found that the vibration is still the same, which indicates that the head height is not the influencing factor. It was originally suspected that the thrust of the thrust tile caused the vibration and abnormal sound of Unit 1.
However, in 19961997 and 1998, the thrust tile surface was found to be smooth and clean, with no obvious abrasion and no burning. So this factor can be ruled out.
The mirror plate moving member and the sealing support body are in contact with each other and rub against each other to vibrate. However, the spindle seal is removed during maintenance. No rubbing marks were found on the mirror plate and the adjacent sealed support. and so. Unit vibration is also not caused by the spindle seal.
4 The reasons and treatment of the vibration of the unit have eliminated many possibilities through the above analysis and inspection. In the annual inspection in 1998, the value of each guide bearing and labyrinth gap was measured. And by reducing the gap between the water guide bearing and the upper guide bearing to adjust the unit swing, the problem of severe vibration of the No. 1 machine with abnormal sound is solved thoroughly.
Adjusting the upper bearing clearance is achieved by adjusting the support bolts.
Water-conducting bearings wear out due to years of operation. The gap value is large. Therefore, the grinding joint surface is used to adjust the bearing clearance. Although this treatment has a certain influence on the roundness of the bearing bush, the allowable value range of the water guiding bearing clearance is larger than that of the upper guiding lower bearing.
Therefore, this treatment does not affect the oil quantity and oil film formation of the water guide bearing.
Adjust the gap between the upper and lower guides and the water guide bearing. If the bearing name is adjusted before the adjustment, the original design allows the value to be superimposed + sense direction + direction water guide + sense direction + 7 direction from 1 to know, the upper guide water guide before adjustment The clearance of the bearing is significantly larger than the set value and the gap size is known. Calling this phase, on the axis, concentric, especially the upper guide tile. Because it is close to the thrust tile, it is similar to the amplification of the lever. When the gap of the upper guide bush is increased, the degree of hooking between the upper crown of the runner and the lower ring of the top cover and the labyrinth of the bottom ring is greatly affected. Due to the existence of excessive clearance and the difference of the heart, when the unit is just started, the water flow in the circumferential direction of the runner is easily unstable, so that the runner is eccentrically biased to the main shaft. Reverse to the side. This causes the top crown of the runner to instantaneously collide with the top cover because the gap between the lower ring and the bottom ring is larger than the gap between the upper ring and the top cover, and the possibility of collision between the lower ring and the bottom ring is small, due to the inclination of the main shaft. Instantaneous friction occurs between the main shaft and each guide bearing bush. Therefore, the vibration of the unit when the unit is turned on is mainly used to seal the tender and mechanical type of welding spring, Teng, Mi Du, privately-produced into the artillery of the large-scale scorpion, and the application of the PMCS in the microcomputer protection system of the Batou Power Station. Lin Zhandong, Liu Jiangxiao, Shenzhen, Guangdong Province Deep Electronic Technology Co., Ltd. 5,1 application, thus improving the system's secure management of protected data.
1 Project Profile The Baltou Hydropower Station is located in Bingcun Town, Mei County, Guangdong Province. The dam site is located at Lishui Hangkou, 0.6 north of Batou Village, Bingcun Town, downstream of the Grotto River. The maximum head of 8.45 is the average head of 7.6. The minimum head is 3.451. It is a low-head day-regulated run-of-flow power station. It is equipped with three 6000-near bulb-type tubular machines. 1. The total installed capacity is 18, and the power station has an annual profit of 3173. The average power generation is 50.16 million kWk. The outlet voltage level is 0. The return line is connected to the Yanyang Tire Factory 10 1 substation.
In the Women's Project, the rabbit training line is recorded with the microcomputer protection device; two main transformers; three generators including excitation transformer; two factory transformers; two near-field transformers 510 close to the power supply line; The equipment is equipped with Xiaoguo General Electric; 10 public protection device.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, points to become a power bamboo equipment. The network will be connected to the host. , 08, server software and customer application software, the following is a brief introduction of each part for the sake of the ten-pronged we first talk about the scare discussion, is 01; also 31 abbreviations are small; 1, do not. It allows a corpse, a program developed under 8 to share data and instructions with other programs, and 00 to establish a customer service relationship between two simultaneously running programs.
The order should be used to capture the number of customers to the customer 1 to accept the customer, the degree of application of the ice that is required for the data is called the customer, allowing the base, the application order to accept data from the device or the party device. It communicates directly with the other, elbow to the application. Such as the formation of a powerful power management system with strong adaptability, in the 8 continent or, plus power management network and support, 0 for display. Analysis and control should be 10 soft between 10 soft palate. 1.1.1 plays the role of bridges and ties.
The gap at the runner labyrinth becomes uniformer than when the rotor is turned on. Thereby the gap through the labyrinth is small. The pressure pulsation of the water at the labyrinth ring is weakened, and the violent vibration phenomenon disappears. When it is turned off, it is different from the case at the time of power-on. The vanes are gradually closed to zero. The unit is untied. The rotation speed slowly drops. At this time, the high pressure water of the runner chamber and the outside has been cut off, so that even if the gap pressure drop exists in the labyrinth, it is not very large. Moreover, the oil film of the guide bearing is not completely destroyed until the unit is completely stopped. Still can withstand the fixed radial force.
Therefore, it will not cause severe vibration when shutting down, and adjust the clearance value of the upper guide bearing and the water guide bearing. Make the guide bearing differently resolved. When the unit is started up, it will vibrate violently with the abnormal sound, and the unit will be safely transported. C author profile Sheng Jihong. male. 28 years old. Assistant engineer
Usually, traditional ventilation and ventilation devices are arranged based on the structure of small spaces, which is feasible in small spaces. With the advancement of ventilation technology, large energy-saving Industrial Fans occupy a place in large spaces such as factories, workshops, and shopping malls, providing three-dimensional air supply, thereby forming airflow throughout the entire area. Space and balance space temperature, improve air quality, and achieve a healthy, comfortable, and safe working environment.
Mall Fan,Commercial Electric Fan,Commercial Exhaust Fans,Fan Mall
Julai (Chongqing) ventilation equipment Co.,Ltd , https://www.julaifans.com