Vibration Test and Diagnosis Analysis and Treatment of Generator Rotor Unsteady Vibration Guo Yujie Lu Bing Yuan Liping Henan Electric Power Test Institute, Zhengzhou, 450052 Hall of Entry Failure Mechanism and Relevant Factors Bifurcation Deep Milk Dynamics Balancing Machine Khan, Khan, Hengheng responded to the provincial government to effectively suppress the vibration of the unit and the divergence exceeded the standard. 1 A 6 plant of a certain factory was produced by the Nanjing Turbine & Electric Motor Factory with a 253.83.8981 type single-cylinder hydraulic condenser. Generator rotor adopts air cooling method, generator and exciter rotor adopt rotor support knot, No. 1 bearing seat falls on the front plate; No. 2 No. 3 bearing falls in the same bearing bore, and the connecting and evacuating cylinder is connected to rest. The bearings are floor-type bearings; 5 bearings are connected through 5 plates of the exciter base, and the shaft support is intended. 1 After the machine is started for the first time in 1998 and the load is placed on the mesh, the horizontal vibration of the bearing 4 increases with the load and time. The extension of the phenomenon of excessive vibration occurs, the load is 54; the rated load is called small, after the most human value of 02, this vibration failure phenomenon repeated in the subsequent start. 1 vibration test for the reasons for the Ming vibration, using, 1 knowledge; more than awkward vibration acquisition system on the shaft bearing vibration and shaft vibration on the No. 4 bearing tested and analyzed, obtained the following vibration characteristics. 7 Thermal variables of the generator bearing response The current large vibration variation of the generator bearing with the rated load can be considered as the unit rated power of 25 cubits under the condition of Jiading, and the reactive load is increased from 1 to 14 cubits. Excitation current increased from 220 to 250. After half an hour, No. 4 No. 4 bearing vibration value gradually increased with time. No. 4 No. 4 bearing horizontal vibration value increased from 52.741 to 56.8192, and the fundamental frequency vibration phase change within 10 This shows that the rotor current has significant influence on the vibration of the generator bearing. There is a time-delay phenomenon. The vibration during deceleration is faster than the soft-generator set with rated load vibration. The state 6 dynamic vibration value increases. The 5th magic stop over the critical speed when the bearing changed from 35 2 melons to 248159 8th start and stop, the 13th and 4th bearing shaft vibrations in the 3rd and 4th tests of the port were first 17 performed 5 cold start When the unit's critical speed, the 31st and 4th bearings have vertical vibration amplitudes less than 40 and 5 times cold start. 30,1 If the vibration characteristics of the no-load conditions, the vibration is mainly the 4th bearing horizontal square, the 4th bearing is the most Vibratory vibration is similar to 50 years. The vibration of the bearing is as small as 30. The first 3 cold start vibrations have a relatively stable phase frequency. The 4th warm start phase of each bearing has a generally reduced phase frequency. 23 cold start times. In the case of Ding Ding with load, the vibration frequency of bearings and shafts is in the bundle frequency and other frequency components are small. Under load conditions, the unit generally increases in vibration amplitude with the increase of time, and the horizontal vibration of the bearing is faster than that of the vibration of the bearing at the No. 4 bearing. Xie Weige 3 start-up process No. 3 and No. 4 Bearing shaft 1 Vibration of bobbing 2 Vibration fault Diagnosis Machine vibration is unstable Unusual forced vibration Analysis of bearing stiffness and vibration signal analysis can eliminate the load of the unit The bad dynamic stiffness of the bearing is asked by the unit; the cold start-up speeding process and the vibration characteristics under no-load 30001.1 conditions can eliminate the failure of the wheel connection, such as excessive eccentricity, etc. The above vibration test and vibration characteristics can be considered as the unit The vibration change is mainly caused by a change in the state of the balance of the generator rotor after a large load on the grid and a significant thermal change occurs in the production of cattle. The generator rotor is affected by the excitation current of the generator and generates a thermal imbalance. It includes time. Exciting current and excitation current are two factors, the vibration increases with time, there is a time lag, indicating that the generator rotor has generated thermal bending or thermal imbalance. Combining with the structure and vibration characteristics of the generator rotor itself, the rotor of the new generator unit generates thermal bending and irregular thermal deformation after the grid connection with the load. The following factors cannot be excluded: The thermal resistance exists between the rotor coil and the raceway Difference; axial heat transfer shaft diameter of the thermal resistance is not uniform; the rotor coil partial short-circuit or interturn short circuit; 3 analysis of the vibration mechanism, said the temperature difference, causing the generator rotor thermal bending and irregular thermal deformation, resulting in this phenomenon The main reasons are the above 8 factors. The deflection caused by the thermal bending of the generator rotor can be approximated by the following formula: The length of the rotor part of the rotor B is calculated; D is the linear expansion coefficient of the steel, approx. 5 CTlA;j3i;cl=The deflection radius of the rotor is calculated from the diameter of the rotor body part. This type of unit will produce a thermal deflection of about 300 million in the radial temperature difference of the rotor at 30001. 24 measures will be taken at the site. It is difficult to clearly generate various factors of thermal bending of the generator rotor. Therefore, dynamic balance compensation is often used to deal with thermal bending and irregular thermal deformation vibration faults of the generator rotor. That is to say, the weight is increased on the rotor to compensate for some of the vibrational thermal variables. The equilibrium weight added is approximately 6 to 7 off of the rotor thermal variables, and the critical speed and no-load 30001.,1 are considered. The vibration under operating conditions should not be too large. After the balance of the balance surface of the heart rotor on both sides of the generator rotor is corrected, the unit is under unloaded 3000 1. and rated load conditions, the shaft bearing vibration value is less than 30, so that the unit is put into safe operation. Conclusion The main reason for vibration of the generator is The anti-motor rotor of the mountain plant is running with a load 17. 1. Hot bending and irregular thermal deformation According to the domestic operating experience and vibration fault diagnosis and statistics, it is clear that the rotor of the generator generates more obvious thermal deformation and it takes about 2 views. Thermal distortion and irregular thermal deformation vibration characteristics of the generator are based on the fact that the fundamental frequency component is small, which is related to the excitation current and time. There is a significant time lag phenomenon on-site mining, dynamic balance at the generator to solve the problem Irregular hot deformation vibration failure kind of office measures, changed, machine 纟. The vibration condition, 1 Schwein new. Turbine generator set vibration. Beijing Water Power Press, 1994 2 Gu Huang. Turbine generator set vibration and balance. Beijing China Electric Power Press, 1998 The author's profile Guo Yujie male. I was born in June. Engineers; mainly from, vibration testing and diagnosis of rotating machinery and testing of power station turbine equipment. Zeng sent a letter to the vibration fault of 10 units of Yangpingqiao Power Plant
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