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CN-122016215-A - Dynamic analyzer for generator stator winding end and use method thereof

CN122016215ACN 122016215 ACN122016215 ACN 122016215ACN-122016215-A

Abstract

The invention provides a dynamic analyzer for a stator winding end part of a generator and a use method thereof, wherein the dynamic analyzer for the stator winding end part of the generator comprises an analyzer main body, an analysis terminal connected with the analyzer main body, a plurality of interfaces, acceleration sensors and impact hammers, wherein the interfaces, the acceleration sensors and the impact hammers are arranged on the analyzer main body, the impact hammers comprise a hammer main body, a hammer handle, a dynamic force sensor and a button group, the dynamic force sensor is arranged at one end of the hammer main body so as to measure dynamic force data, the button group is arranged on the hammer handle and/or the hammer main body so as to position a measured wire rod, and a liquid crystal display screen is used for adding a hammer test wire rod switching button and adding a hammer screen display on the dynamic characteristic analyzer for the stator winding end part of the generator.

Inventors

  • YU KAI
  • ZHANG CHUNHUI
  • Mao Benli
  • YAO YANG

Assignees

  • 华电电力科学研究院有限公司

Dates

Publication Date
20260512
Application Date
20260113

Claims (10)

  1. 1. The dynamic analyzer for the end part of the stator winding of the generator comprises an analyzer main body (1), an analysis terminal (2) connected with the analyzer main body (1) and a plurality of interfaces arranged on the analyzer main body (1); Characterized by further comprising: the acceleration sensor (3) is arranged on the generator stator winding, and the acceleration sensor (3) is electrically connected with the analyzer main body (1) so as to measure and convey acceleration data of the generator stator winding; An impact force hammer (4), the impact force hammer (4) being electrically connected with the analyzer body (1) to deliver dynamic force data; Wherein the impact hammer (4) comprises: A hammer body (16) electrically connected to the analyzer body (1) for hammering measurement; a hammer grip (22), the hammer grip (22) being provided on the hammer body (16); a dynamic force sensor (15), wherein the dynamic force sensor (15) is arranged at one end of the force hammer body (16) to measure dynamic force data; A set of buttons provided on the hammer grip (22) and/or the hammer body (16) to locate the bar being measured; the liquid crystal display screen (20), liquid crystal display screen (20) are located power hammer handle (22) and/or power hammer body (16), liquid crystal display screen (20) are used for collecting dynamic force sensor (15) data and show.
  2. 2. The generator stator winding end dynamics analyzer of claim 1, wherein the interface comprises: The USB connector (5) is arranged on the analyzer main body (1), and the USB connector (5) is used for connecting the analysis terminal (2) and the analyzer main body (1); The SMA connector (6) is arranged on the analyzer main body (1), and the SMA connector (6) is used for connecting the acceleration sensor (3) and the analyzer main body (1); The BNC connector (7), the BNC connector (7) is arranged on the analyzer main body (1), the BNC connector (7) is electrically connected with a data acquisition module of the analyzer main body (1), and the BNC connector (7) is used for connecting the dynamic force sensor (15) and the analyzer main body (1); Aviation connector (8), aviation connector (8) are located on analyzer main part (1), aviation connector (8) are connected with the control and the display module electricity of analyzer main part (1), aviation connector (8) are used for analyzer main part (1) with liquid crystal display (20) with the button difference is connected.
  3. 3. A generator stator winding end dynamic analyzer according to claim 2, characterized in that a first transmission line (10) is connected between the USB connector (5) and the analysis terminal (2); a second transmission line (11) is connected between the SMA joint (6) and the acceleration sensor (3); A communication joint (21) is arranged on one side of the force hammer handle (22), and is electrically connected with a liquid crystal display screen (20) and a control and display module of the button group, and a fourth transmission line (13) is connected between the communication joint (21) and the aviation joint (8); The end part of the force hammer handle (22) is provided with a dynamic force sensor force signal BNS connector (23) which is electrically connected with a data acquisition module in the dynamic force sensor (15), and a third transmission line (12) is connected between the dynamic force sensor force signal BNS connector (23) and the BNC connector (7).
  4. 4. A generator stator winding end dynamic analyzer according to claim 3, characterized in that the fourth transmission line (13) is transmitted using a (7) wire communication line connection of a (7) core air connector.
  5. 5. A generator stator winding end dynamic analyzer according to claim 1, characterized in that the set of buttons comprises a first button (17) and a third button (19) arranged side by side on a force hammer grip (22); -said first button (17) is used to select the next measurement target; the third button (19) is used for selecting the last measuring target; the singlechip adopted by the button group is an ADC port so as to read the states of a plurality of buttons.
  6. 6. A generator stator winding end dynamic analyzer according to claim 1, characterized in that the liquid crystal display (20) is a4 pin IPS display.
  7. 7. The generator stator winding end dynamic analyzer according to claim 1, characterized in that the working surface of the dynamic force sensor (15) is provided with an impact force hammer rubber head (14), the impact force hammer rubber head (14) being coated on the dynamic force sensor (15).
  8. 8. A method of using a generator stator winding end dynamics analyzer according to any of claims 1-7, the method of using comprising: The experimental preparation stage comprises the steps of starting an analyzer main body (1) and an analysis terminal (2), and respectively connecting the analysis terminal (2), an acceleration sensor (3) and an impact hammer (4) with the analyzer main body (1); Inputting the number of stator winding bars of a tested generator into test software, generating an initial geometric figure, entering an admittance measurement interface, and starting an impact force hammer to start a test; the experiment is carried out, namely, a tester operating the impact hammer knocks the stator bar corresponding to the number according to the number of the bar on the display screen of the impact hammer; After the experiment is finished, the test personnel for analyzing the test data carry out overall analysis on the test data, and retests are required to be carried out aiming at individual test data; When the test staff operating the impact force hammer has misoperation, the test stick is not knocked, the analyzer records error data, the button group is adjusted, the next stick is switched to return to test the test stick again, and the error in the operation process is conveniently adjusted by the test staff operating the impact force hammer.
  9. 9. The method of claim 8, wherein during the experimental stage, the bar number on the power hammer display screen is "X I", wherein X represents the bar number and roman number represents the number of successful taps.
  10. 10. The method for using the generator stator winding end dynamic characteristic analyzer according to claim 8, wherein the retesting step comprises the step of selecting a wire rod to be retested through test software, wherein the liquid crystal display screen (20) displays a corresponding wire rod number, and an operator retests according to the displayed wire rod number.

Description

Dynamic analyzer for generator stator winding end and use method thereof Technical Field The invention relates to the technical field of dynamic analysis equipment, in particular to a generator stator winding end dynamic analyzer and a using method thereof. Background The stator winding end is a winding part from a stator core notch to a stator winding nose and a fixed supporting structure thereof, the annular lead (parallel ring) is an arc-section lead of the stator winding end, the nose is connected to an outgoing parallel block, the phase lead is a connection part of the stator winding end annular lead and a stator coil, and the main lead is a lead of the stator winding end annular lead connected to an outgoing sleeve. According to corresponding regulations, specifications and technical standards, when a new machine is connected, overhauled, short-circuit impacted, a stator bar is replaced, a stator winding end fixing structure is changed or necessary, dynamic characteristic measurement is needed to be carried out on the stator winding end to check the fastening and abrasion conditions of the stator winding end so as to identify the modal parameters of the stator of the generator, and vibration characteristic analysis, vibration fault diagnosis and prediction are provided for the stator of the generator. The dynamic characteristic analyzer for the stator winding end part of the generator is a method for measuring the dynamic characteristic of the stator winding end part of the steam turbine generator by adopting a hammering method, and comprises an impact force hammer, an acceleration sensor and a data analyzer, wherein the impact force hammer is also called a force hammer and is formed by combining a hammer body and a dynamic force sensor, and is a common excitation device in a modal test. The energy level and the frequency range of the exciting force depend on the force applied by an operator, the mass of a force hammer, the hardness of a hammer head and the plasticity of a knocked point on a structure, the force hammer is used for hammering the measuring point position of the end part of a stator winding, an acceleration sensor is used for measuring acceleration response, a force signal and an acceleration signal are amplified by an amplifier and are sent to a dynamic signal analyzer for analysis, and then the frequency response function of the structure can be obtained. And measuring the response ratio corresponding to the inherent frequencies of phase leads and main leads of the stator winding end part, the integral elliptical mode or four-lobe mode shape of the stator winding end part and the inherent frequencies of frequency response functions of the stator winding end part and the origin of the leads by using a dynamic characteristic analyzer of the stator winding end part of the generator. The measuring point positions of the end integral mode shape test are three circumferences shown in figure 3 on the inner cross section of the end cone body of the steam side winding and the excitation side winding, the measuring points on each circumference are uniformly distributed along the circumference, the number of measuring points of the 2-pole generator is at least 16, the number of measuring points of the 4-pole generator is at least 32, and the measuring points are measured according to the sequence from circumference 1 to circumference 3 (shown in figure 3). The invention discloses an automatic knocking device for a force sensor for a mode test of a stator winding end part of a generator, which is disclosed in China patent document with the publication number of CN207816554U, wherein a vertical upright sleeve is arranged on a bottom plate of the automatic knocking device for the mode test of the stator winding end part of the generator, a slide bar which moves and is fixed along the vertical direction is arranged on the upright sleeve, a rotary balance bar is arranged on the upper part of the slide bar through a rotary shaft, an arc block which protrudes downwards is arranged at the lower part of one end of the balance bar, a cam which is controlled by a handle to rotate is arranged on a base below the arc block, a push rod corresponding to the arc block is arranged on the cam, a reset spring connected with the bottom plate is arranged between the cam and the slide bar on the balance bar, and a test hammer is arranged at the other end of the balance bar. The device for testing the mode of the winding stator comprises a hanging mechanism for hanging the winding stator in the air and a force hammer with a force sensor, wherein the force hammer is positioned above the hung winding stator, the force sensor is connected with a charge testing regulator, the outer surface of the winding stator is divided into N equal parts along the circumferential direction, M measuring points are uniformly distributed on each equal part along the axial direction, an acceleration sensor is arranged on each measuring poin