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3 Measuring point arrangement The Oriental 60MW steam turbine generator is an air-cooled steam turbine generator with large single-unit capacity designed and produced by Dongfang Electric Machinery Co., Ltd. It has broad market prospects with convenient and safe cooling method. A large amount of technical development has been made during the design phase of the aircraft. On the eve of the factory, the type test was carried out to test the relevant parameters, further improve the scientific research work of the unit, and objectively analyze and evaluate the vibration. This paper focuses on the methods and research results of stator end winding vibration test and data analysis and processing.
2 Test conditions Working conditions 1: Idle condition 2: No load 1.3t / Case 3: No load 1.11/ Two-phase steady-state short-circuit condition 4: No-load 1.Of / three-phase steady-state short-circuit condition 5: No-load 0.9f/two-phase short-circuit sudden excitation condition 6: no-load 0.786J/condition 8: two-phase steady-state short-circuit condition 9: two-phase short-circuit sudden excitation condition 10: three-phase steady-state short circuit in excitation The end windings are equipped with 8 accelerometers. The position is as shown. The accelerometer is glued to the end windings. A BENTLY speed sensor is installed in the middle of the bottom of the core. BENTLY is installed in the base, end cover and bearing pads. The speed sensor is tested and a BENTLY displacement sensor is installed at the drive motor journal to test the speed and phase lock signal.
The test system consists of sensors, amplifiers, and analytical instruments: December 12, 2001. The stator end winding vibration is measured by the acceleration sensor and its matched impedance transformer and voltage amplifier. The vibration of the base and the housing is picked up by the BN speed sensor. The shaft speed and phase lock signal are tested by the BN displacement sensor. Into the signal transfer box, input analysis instrument for signal analysis and data processing, the spectrum analysis of the test signal is completed by HP3560A, the amplitude and phase measurement of each point vibration is completed by DVF-2. Test system instrument connections are shown.
5 test results (test data is omitted). The vibration acceleration of the end winding is a single peak, the unit is g= 9.81mA2, and the vibration of the base and the bearing housing is a single peak.
(Test data is omitted). The vibration acceleration of the end winding is the effective value, the unit is g=9.81m/s2, the vibration of the base and the bearing housing is the effective value, the unit is jwn. 6 Data processing 6.1 Data processing method According to the vibration and mathematical theory, the vibration acceleration of the continuous body Can be reduced to the following form: i = Ge (0 pairs of two suspicions of the value of the displacement of the displacement: 6.2 end winding vibration trend analysis and running mode analysis.
(1) From the test results of the above 10 working conditions, the 100 Hz vibration trend of the 8 end points of the excitation end winding is seen. See the ~10 end line bar 3 measuring point vibration trend end winding 4 measuring point vibration trend end winding 5 Measuring point vibration trend end winding 6 measuring point vibration trend (2) From the vibration amplitude and phase angle of the working end 4 end winding, the electromagnetic vibration running mode of the end winding is made, the time is r/4 772, 3774, and 71, by the following formula: respectively, the vibration displacement value of the eight measuring points of the end winding of the excitation end is calculated, and the electromagnetic vibration running mode of the end winding of the excitation end can be made 1. 0 end winding 8 Measuring point vibration trend 1 End winding running vibration mode 7 Analysis Discussion The above test data shows that the 60MW air-cooled turbo generator stator base, stator core, bearing bush and steam end cover are under idle, no-load and short-circuit conditions. The vibration is very small, and its frequency components are mainly frequency conversion and frequency doubling. In the idling operation condition, the end-to-end end cap vibration is 45, and the frequency component is 28 (11!). The vibration under no-load and short-circuit conditions is small. We think that this is mainly related to the air duct, the end cover and the base. Tightness is related.
The vibration conditions of the end windings under different working conditions are quite different: the idling, two-phase steady-state short-circuit and three-phase steady lacquer short-circuit conditions have less vibration, and the frequency components are mainly 5'QHZ, 100Hz and 111~114HZ. Under the no-load condition, the vibration of each measuring point is large, and rises with the increase of the excitation voltage. When the frequency component is *3 times and 1*0 times the rated excitation voltage, the frequency-transmitted vibration of the winding 3 measuring point reaches 219jun respectively. And 104|xm, after analysis, it is found that: Because the 3 measuring point is located at the 3 o'clock position of the excitation end (see) near the stator wiring copper bar, the test signal is affected by the voltage of the stator wiring busbar, so the signal is distorted and the vibration is tested. The value has lost its authenticity. The maximum frequency doubling vibration (100 Hz electromagnetic vibration) of 1.3 times and 1.0 times the rated excitation voltage occurs at 2/5, *7, *8 measuring points, and the vibration values ​​are respectively 27|jun, 25 (xm, respectively) at 1.3 times excitation voltage. 23, 24jwn, 1.0 times the rated excitation voltage, its vibration value is relatively small, no more than 4, because the vibration frequency is higher, its vibration speed is still large, so the vibration and squeak caused by it can not be ignored, deep people The analysis found that the vibration of 110~112Hz may be caused by the natural frequency of the end winding.
The vibration of the excitation end winding in the two-phase short-circuit excitation (eight=0.894 times rated current, duration 30s) is mainly frequency doubling vibration, the maximum vibration value is 18jun, and the frequency of the winding at the same time is 75Hz. And low amplitude vibration of 120Hz.
The mechanical vibration and electromagnetic vibration of the turbo generator are not large. The electromagnetic vibration has obvious but irregular circular running mode. The vibration mode node is located between 3 measuring points, 4 and 5 measuring points, 6 and 7. Between the measuring points, between 7 and 8 measuring points.
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