Device for testing shaft voltage of steam turbine generator

Abstract

The invention relates to the technical field of voltage testing, and provides a device for testing shaft voltage of a steam turbine generator, which comprises a generator end shaft voltage acquisition device, an excitation end shaft voltage acquisition device and a remote control display device, and the remote control display device is wirelessly connected with the generator end shaft voltage acquisition device and the excitation end shaft voltage acquisition device respectively. Each of the generator end shaft voltage acquisition device and the excitation end shaft voltage acquisition device comprises a data acquisition end and a telescopic mechanism, the data acquisition end is connected to the telescopic end of the telescopic mechanism, a plurality of connecting pieces are arranged on the outer side of the fixed end of the telescopic mechanism, and the connecting pieces are used for being connected with a generator shell above a generator end or an excitation end large shaft. The operation work can be completed by only one person, too much manpower is not needed, the operation is simple, and the working efficiency is greatly improved. According to the invention, the test safety is improved. And the tool is wirelessly controlled, so that the safety guarantee of testers is improved.

Description

Technical Field

[0001] The invention relates to the technical field of voltage testing, in particular to a device for testing shaft voltage of a steam turbine generator. Background Art

[0002] Generator shaft voltage measurement is to measure the pressure difference between the steam end and the excitation end of the generator shaft. When the shaft voltage is greater than a certain value, shaft current will be generated. The appearance of shaft current will cause serious electrical corrosion damage to the shaft seal and bearing. In order to prevent the shaft voltage from being too high, the shaft voltage of the generator must be measured. The regulations stipulate that the shaft voltage shall not be greater than 20V.

[0003] At present, the measurement of shaft voltage requires two people to use insulating rods with carbon brushes to touch the rotating shaft of the generator respectively, and the third person leads the measurement line from the carbon brush to the multimeter to measure the shaft voltage. This kind of measurement has certain defects. First, because the shaft rotates at high speed, it is dangerous for two people to touch the shaft with insulating rods in their hands. Secondly, the whole measurement process requires three people to complete, which is manpower-consuming. Moreover, the three people are conducting experiments in a noisy factory. During the experiment, the distance between each person is far, and communication is very difficult. Summary of the invention

[0004] The present invention provides a device for testing the shaft voltage of a steam turbine generator, which is used to solve the technical problems raised by the above-mentioned background technology.

[0005] In order to solve the above problems, the present invention discloses a device for testing shaft voltage of a steam turbine generator, comprising:

[0006] A machine-end shaft voltage acquisition device, an excitation-end shaft voltage acquisition device and a remote control display device, wherein the remote control display device is wirelessly connected to the machine-end shaft voltage acquisition device and the excitation-end shaft voltage acquisition device respectively.

[0007] Preferably, the machine-end shaft voltage collection device and the excitation-end shaft voltage collection device both include: a data collection end and a telescopic mechanism, wherein the data collection end is connected to the telescopic end of the telescopic mechanism, and a plurality of connecting parts are arranged on the outside of the fixed end of the telescopic mechanism, and the connecting parts are used to connect to the generator casing above the main shaft of the machine end or the excitation end of the generator.

[0008] Preferably, the telescopic mechanism comprises:

[0009] A fixed cylinder, wherein a telescopic track parallel to the axial direction of the fixed cylinder is arranged inside the fixed cylinder, a telescopic rod slides along the direction of the telescopic track and passes through one end of the fixed cylinder, a data acquisition end is connected to the end of the telescopic rod outside the fixed cylinder, and the connecting piece is arranged outside the fixed cylinder;

[0010] The first screw is axially arranged parallel to the fixed tube, the first screw is rotatably connected in the fixed tube, the first screw is driven to rotate by the driving device, the sliding buckle is threadedly connected to the first screw, the sliding buckle is slidably connected to the telescopic track, and the sliding buckle is fixedly connected to the telescopic rod.

[0011] Preferably, the driving device comprises:

[0012] The motor control compartment is fixedly connected to one side of the fixed cylinder, and the motor is arranged in the motor control compartment. The gear compartment is fixedly connected to the end of the fixed cylinder away from the data acquisition end. The first gear and the second gear are arranged in the gear compartment. The first gear is fixed to the output shaft of the motor, and the second gear is fixedly connected to the first screw rod. The motor main control board is arranged in the motor control compartment, and the motor main control board is wirelessly connected to the remote control display device. The motor main control board is used to control the motor.

[0013] Preferably, the connecting member is a strong magnet.

[0014] Preferably, the data collection terminal includes:

[0015] An insulating outer groove and an insulating inner groove, wherein the insulating inner groove is arranged inside the insulating outer groove, and a spring is fixedly connected between the insulating inner groove and the insulating outer groove, and the insulating inner groove is connected to a carbon brush fixing assembly, the carbon brush fixing assembly is used to fix the carbon brush, the carbon brush is used to contact the large shaft to collect potential data, and the carbon brush is connected to a carbon brush lead;

[0016] The data acquisition mainboard compartment is connected to the insulating outer groove. A carbon brush data sampling main control board is arranged in the data acquisition mainboard compartment. The carbon brush lead is electrically connected to the carbon brush data sampling main control board. The carbon brush data sampling main control board is wirelessly connected to the remote control display device.

[0017] Preferably, track notches are respectively arranged on opposite sides of the insulating outer groove, and the track notches are connected to the carbon brush fixing assembly one by one, and the carbon brush fixing assembly includes: a second screw, the second screw thread penetrates the corresponding side wall of the insulating inner groove, the second screw is located at one end of the insulating inner groove and is connected to an insulating plate, the insulating plate is used to clamp the carbon brush, and the second screw is connected in the track notch along an axial direction parallel to the insulating outer groove and slides.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the data acquisition end of the machine-end shaft voltage acquisition device is used to acquire the potential data of the large shaft machine end, and the data acquisition end of the excitation-end shaft voltage acquisition device is used to acquire the potential data of the large shaft excitation end. The potential data acquired by the machine-end shaft voltage acquisition device and the excitation-end shaft voltage acquisition device are wirelessly transmitted to the remote control display device respectively, and the shaft voltage data on the remote control display device can be read and compared with the standard value; and the potential data acquisition work of the data acquisition end can be realized by remotely controlling the telescopic mechanism of the remote control display device. The present invention improves work efficiency. The operation can be completed by only one person, without too much manpower, and the operation is simple, which greatly improves work efficiency. The present invention improves the safety of the test. The tool adopts wireless control, which improves the safety of the test personnel.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the shaft voltage acquisition device of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the data acquisition terminal of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the gear of the present invention;

[0024] Figure 4 It is a schematic diagram of the present invention.

[0025] In the figure: 1. data acquisition end; 2. telescopic rod; 3. fixed cylinder; 4. first screw; 5. telescopic track; 6. strong magnet; 7. motor control compartment; 8. motor; 91. first gear; 92. second gear; 10. gear compartment; 11. sliding buckle; 12. carbon brush; 13. second screw; 14. data acquisition mainboard compartment; 15. spring; 16. insulating inner groove; 17. carbon brush lead; 18. insulating outer groove. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0029] The present invention provides the following embodiments

[0030] Embodiment 1, the present invention provides a device for testing the shaft voltage of a steam turbine generator, such as Figure 1-Figure 4 As shown, including:

[0031] A machine-end shaft voltage acquisition device, an excitation-end shaft voltage acquisition device and a remote control display device, wherein the remote control display device is wirelessly connected to the machine-end shaft voltage acquisition device and the excitation-end shaft voltage acquisition device respectively.

[0032] Preferably, the machine-end shaft voltage collection device and the excitation-end shaft voltage collection device both include: a data collection terminal 1, a telescopic mechanism, the data collection terminal 1 is connected to the telescopic end of the telescopic mechanism, and a plurality of connectors are arranged outside the fixed end of the telescopic mechanism, and the connectors are used to connect to the generator 8 housing above the machine-end or excitation-end main shaft of the generator 8. Preferably, the connector is a strong magnet 6.

[0033] The working principle of the above technical solution is: first, the data acquisition ends 1 of the machine-end shaft voltage measuring device and the excitation-end shaft voltage measuring device are successively adsorbed downward to the appropriate positions of the outer shell above the steam-end and excitation-end large shafts, the power switches of the shaft voltage measuring device and the remote control display device are turned on, and commands are sent using the remote control display device to extend the shaft voltage measuring devices respectively so that the data acquisition ends of the devices at both ends can stably contact the large shaft, read the shaft voltage data on the remote control display device, and compare them with the standard value.

[0034] The beneficial effects of the above technical solution are as follows: the data acquisition terminal 1 of the machine-end shaft voltage acquisition device is used to acquire the potential data of the large shaft machine end, and the data acquisition terminal 1 of the excitation-end shaft voltage acquisition device is used to acquire the potential data of the large shaft excitation end. The potential data acquired by the machine-end shaft voltage acquisition device and the excitation-end shaft voltage acquisition device are wirelessly transmitted to the remote control display device respectively, and the shaft voltage data on the remote control display device can be read and compared with the standard value;

[0035] Furthermore, the potential data collection work of the data collection terminal 1 can be realized by remotely controlling the telescopic mechanism through the remote control display device.

[0036] The invention improves work efficiency. The operation can be completed by only one person without too much manpower, and the operation is simple, which greatly improves work efficiency.

[0037] The invention improves the safety of the test. The tool adopts wireless control, which improves the safety of the test personnel.

[0038] Embodiment 2, based on embodiment 1, the telescopic mechanism comprises:

[0039] A fixed cylinder 3, a telescopic track 5 parallel to the axial direction of the fixed cylinder 3 is arranged inside the fixed cylinder 3, the telescopic rod 2 slides along the direction of the telescopic track 5 and passes through one end of the fixed cylinder 3, the data acquisition end 1 is connected to the end of the telescopic rod 2 outside the fixed cylinder 3, and the connecting piece is arranged outside the fixed cylinder 3;

[0040] The first screw rod 4 is axially arranged parallel to the fixed tube 3, the first screw rod 4 is rotatably connected in the fixed tube 3, the first screw rod 4 is driven to rotate by the driving device, the sliding buckle 11 is threadedly connected to the first screw rod 4, the sliding buckle 11 is slidably connected to the telescopic track 5, and the sliding buckle 11 is fixedly connected to the telescopic rod 2. Optionally, an axial groove can be arranged at the lower part of the telescopic rod 2, and the axial groove is sleeved on the outer groove of the first screw rod 4.

[0041] Preferably, the driving device comprises:

[0042] The motor control compartment 7 is fixedly connected to one side of the fixed cylinder 3, and the motor 8 is arranged in the motor control compartment 7. The gear compartment 10 is fixedly connected to the end of the fixed cylinder 3 away from the data acquisition end 1. The first gear 91 and the second gear 92 are arranged in the gear compartment 10. The first gear 91 is fixed to the output shaft of the motor 8, and the second gear 92 is fixedly connected to the first screw 4. The motor 8 main control board is arranged in the motor control compartment 7. The motor 8 main control board is wirelessly connected to the remote control display device, and the motor 8 main control board is used to control the motor 8.

[0043] The working principle and beneficial effects of the above technical solution are:

[0044] The telescopic rod 2 is the extendable part of the entire device. Under the action of the first screw 4, it can move and extend along the telescopic track 5 toward the outside of the fixed tube 3 through the sliding buckle 11, thereby realizing the extension of the entire device. There are two limit stops at the top and bottom of the telescopic track 5 to prevent it from being scratched outside the telescopic track 5. The function of the strong magnet 6 is to enable the shaft voltage acquisition device to be adsorbed on the generator 8 casing above the steam end (machine end) and the excitation end of the generator 8. The motor control compartment 7 is equipped with a motor main control board, which controls the forward and reverse rotation and stop operation of the motor 8. The motor 8 drives the first gear 91 in the gear compartment 10 to rotate, the first gear 91 drives the second gear 92, the second gear 92 drives the first screw 4 to rotate, and the first screw 4 drives the telescopic rod 2 to extend and shorten outward, thereby realizing the extension and shortening of the device. The gear structure diagram is shown in the figure. Figure 3 The telescopic rod 2, the fixed cylinder 3, the first screw rod 4, the telescopic rail 5, and the data acquisition mainboard compartment 14 are all made of metal. The fixed cylinder 3 has a grounding wire, which can provide a 0 potential reference point for the data acquisition device and also play a role in protective grounding.

[0045] Embodiment 3, based on embodiment 1 or 2, the data acquisition terminal 1 includes:

[0046] An insulating outer groove 18 and an insulating inner groove 16, wherein the insulating inner groove 16 is arranged inside the insulating outer groove 18, and a spring 15 is fixedly connected between the insulating inner groove 16 and the insulating outer groove 18, and the insulating inner groove 16 is connected to a carbon brush 12 fixing assembly, the carbon brush 12 fixing assembly is used to fix the carbon brush 12, the carbon brush 12 is used to contact the large shaft to collect potential data, and the carbon brush 12 is connected to a carbon brush lead 17;

[0047] The data acquisition mainboard compartment 14 is connected to the insulating outer groove 18. A carbon brush 12 data sampling mainboard is arranged in the data acquisition mainboard compartment 14. The carbon brush lead 17 is electrically connected to the carbon brush 12 data sampling mainboard. The carbon brush 12 data sampling mainboard is wirelessly connected to the remote control display device.

[0048] Preferably, track notches are respectively provided on opposite sides of the insulating outer groove 18, and the track notches are connected to the carbon brush 12 fixing components one by one. The carbon brush 12 fixing components include: a second screw 13, the second screw 13 threadedly penetrates the corresponding side wall of the insulating inner groove 16, the second screw 13 is located at one end of the insulating inner groove 16 and is connected to an insulating plate, the insulating plate is used to clamp the carbon brush 12, and the second screw 13 is connected in the track notch along an axial direction parallel to the insulating outer groove 18 and slides.

[0049] The beneficial effects of the above technical solution are:

[0050] The main function of the data acquisition terminal 1 is to collect potential data. The function of the carbon brush 12 is to directly contact the main shaft to collect potential data. The carbon brush 12 is fixed to the insulating inner groove 16 by the second screw 13 with insulating plates on the top of both sides. There is a track notch in the insulating outer groove 18. When the carbon brush 12 is pressed on the main shaft, the carbon brush 12, the insulating inner groove 16, and the second screw 13 can move upward along the track notch. The spring 15 can increase the contact pressure between the carbon brush 12 and the main shaft, making the collected potential more accurate. The potential collected by the carbon brush is led to the carbon brush 12 data sampling main control board in the data acquisition main board compartment 14 by the carbon brush lead 17, and the carbon brush 12 data sampling main control board sends the potential data to the remote control display device via wireless.

[0051] Embodiment 4, based on any one of Embodiments 1-3, further comprises:

[0052] A first distance detection device is used to detect the vertical distance between the lower end outer wall of the insulating inner groove 16 and the lower end inner wall of the insulating outer groove 18;

[0053] An angle detection device, used to detect the angle between the lower end of the insulating inner groove 16 and the horizontal direction;

[0054] A timer, used for timing the working time of the device for testing the shaft voltage of the steam turbine generator;

[0055] A vibration detection device, detachably connected to the insulating inner groove 16;

[0056] The third acquisition module is used to obtain the allowable contact force range between the carbon brush 12 and the steam turbine generator shaft corresponding to the current steam turbine generator shaft and carbon brush 12 (the maximum value of the allowable contact force range is considered to avoid damage to related devices; the minimum value of the allowable contact force range is considered to be able to contact and detect potential data, which can be obtained according to the test. The test controls the motor to work so that the carbon brush 12 contacts the detection potential, and the contact force can be judged according to the compression amount of the spring);

[0057] The first distance detection device, the vibration detection device, and the angle detection device are wirelessly connected to the remote control display device, which is also electrically connected to the third acquisition module and the timer. The remote control display device controls the motor 8 based on the third acquisition module, the timer, the vibration detection device, and the angle detection device, including:

[0058] Step S1: selecting a number of target contact forces from the allowable contact force range between the carbon brush 12 and the turbine generator shaft according to a preset contact force interval from small to large, wherein the target contact force is greater than or equal to the minimum contact force of the allowable contact force range between the carbon brush 12 and the turbine generator shaft and is less than the maximum contact force;

[0059] Step S2: Control the motor 8 to work so that the actual contact force between the carbon brush 12 and the shaft of the steam turbine generator is respectively subjected to contact evaluation detection for different target contact forces, each contact evaluation detection is subjected to a first set duration, and in each contact evaluation detection process, the first distance detection device, the angle detection device and the vibration device are controlled to detect multiple times; construct an actual potential data change curve and an angle detection device detection value change curve; in the actual potential data change curve, the horizontal axis is time, and the vertical axis is potential data obtained based on the carbon brush 12; in the angle detection device detection value change curve, the horizontal axis is time, and the vertical axis is the angle detection device detection value;

[0060] Calculate the evaluation result of the contact evaluation detection based on the detection values ​​of the first distance detection device and the vibration device and the angle detection device during each contact evaluation detection process;

[0061] When the evaluation result of the contact evaluation detection is greater than or equal to the corresponding reference evaluation result, the test is stopped, and the target contact force corresponding to the time of stopping the test is used as the set contact force corresponding to the current turbine generator shaft and the carbon brush 12;

[0062] Step S3: the current turbine generator shaft and the carbon brush 12 are tested with the set contact force during the subsequent voltage test;

[0063] Preferably, the evaluation result of the contact evaluation test is calculated based on the following formula:

[0064]

[0065] T S A is the assessment result of the sth contact assessment test; Si1 A is the average value of the i-th vibration information detected by the vibration detection device for the s-th contact evaluation detection; Si2 A is the maximum value of the i-th vibration information detected by the vibration detection device for the s-th contact evaluation detection; i0 is the reference value of the i-th vibration information; for The corresponding measurement effect evaluation value (can be obtained based on the preset table, the value is greater than -1 and less than 1); B s2 B is the total time length corresponding to the abscissa of the actual potential data change curve corresponding to the s-th contact evaluation detection; s1 B is the effective detection time of the actual potential data change curve corresponding to the s-th contact evaluation detection (the potential data detection value is invalid if it is small or abnormal compared with the detection value at other times); s3 is the number of abnormal potential mutations of the actual potential data change curve (a standard potential data change curve may be preset, and the change trajectory trend of the mutation point of the actual potential data change curve is inconsistent with the trend of the standard potential data change curve, which may be an abnormal mutation); Ds2 D is the total duration corresponding to the horizontal coordinate of the angle detection device detection value change curve corresponding to the s-th contact evaluation detection; s1 D is the abnormal detection duration of the angle detection device detection value change curve corresponding to the s-th contact evaluation detection; s3 is the number of sudden changes in the angle detection value of the angle detection device detection value change curve corresponding to the s-th contact evaluation detection (the difference between the two detection values ​​before and after is abnormal); o is the total number of first distance detection devices; V st is the number of times the difference between the two detection values ​​of the tth first distance detection device in the sth contact assessment detection is abnormal; C1, C2, C3 are weight one, weight two, and weight three respectively (the values ​​are greater than 0 and less than 1); exp represents the natural exponential function.

[0066] The beneficial effects of the above technical solution are:

[0067] 1. The angle between the lower end of the insulating inner groove 16 and the horizontal direction reflects the posture of the insulating inner groove 16. The insulating inner groove 16 needs to be in a suitable posture to ensure that the carbon brush 12 can reliably contact the turbine generator shaft to detect the potential; abnormal vibration of the insulating inner groove 16 may affect the detection effect of the carbon brush 12; the vertical distance between the outer wall of the lower end of the insulating inner groove 16 and the inner wall of the lower end of the insulating outer groove 18 reflects the contact force compression state of the carbon brush 12 and the turbine generator shaft;

[0068] Selecting a number of target contact forces from the allowable contact force range between the carbon brush 12 and the turbine generator shaft according to the preset contact force interval from small to large, so as to avoid damage to components caused by excessive contact force or failure to detect due to too small contact force;

[0069] 2. Control the motor 8 to work, so that the actual contact force between the carbon brush 12 and the turbine generator shaft is different target contact forces for contact evaluation detection, and the evaluation results of the contact evaluation detection are integrated: vibration state The overall posture of the lower end of the insulating inner groove 16 (inclined state Angle change status Displacement change state ) Detection status of potential data Comprehensive evaluation of aspects and reliable calculation;

[0070] It is convenient to ensure that the contact force is of appropriate size and the contact force is set appropriately according to the evaluation results to ensure the detection effect.

[0071] Embodiment 5, based on any one of Embodiments 1-4, further comprises:

[0072] A first distance detection device is used to detect the vertical distance between the lower end outer wall of the insulating inner groove 16 and the lower end inner wall of the insulating outer groove 18;

[0073] The first acquisition module is used to acquire the material parameters and speed parameters of the current steam turbine generator shaft;

[0074] A second acquisition module is used to acquire material and size parameters of the carbon brush 12;

[0075] A first calculation module, used for calculating the maximum allowable contact force between the carbon brush (12) and the turbine generator shaft based on the first acquisition module and the second acquisition module;

[0076]

[0077] G0 is the maximum allowable wear parameter of the turbine generator shaft corresponding to its own material and rotation speed; h is the hardness of the carbon brush 12 material, ∈ is the elongation at break of the carbon brush 12 material, R1 is the radius of the contact part of the turbine generator shaft with the carbon brush 12, a is the area of ​​the contact part of the carbon brush 12 with the turbine generator shaft, is the curvature coefficient of the contact part between the turbine generator shaft and the carbon brush 12; E1 and θ1 are the elastic modulus and Poisson's ratio of the carbon brush 12 respectively; E2 and θ2 are the elastic modulus and Poisson's ratio of the contact part between the turbine generator shaft and the carbon brush 12 respectively; π is 3.14; γ1 is the aging coefficient of the carbon brush 12; e is a natural constant;

[0078] A second calculation module, used for calculating the minimum allowable detection value of the first distance detection device corresponding to each spring based on the first calculation module;

[0079]

[0080] H is the minimum allowable detection value of the first distance detection device corresponding to each spring, H0 is the detection value of the first distance detection device when the spring is not compressed; G1 is the resultant force of the component forces that can be generated on the spring along the compression direction of the spring, in addition to the force of the turbine generator shaft on the carbon brush 12; K is the elastic coefficient of the spring; U is the total number of springs;

[0081] The first alarm is used to alarm when the actual detection value of the first distance detection device is less than or equal to the minimum allowable detection value of the first distance detection device.

[0082] The beneficial effects of the above technical solution are: obtaining the current material parameters and speed parameters of the steam turbine generator shaft, and considering the material and size parameters of the carbon brush 12 at the same time, to determine the maximum allowable contact force between the carbon brush 12 and the steam turbine generator shaft, avoiding damage (abnormal wear) to the steam turbine generator shaft and carbon brush 12 during the detection process, and determining the contact force state based on the detection value of the first distance detection device, and timely alarming when the contact force state is abnormal, thereby ensuring the reliability of the detection.

[0083] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for testing shaft voltage of a steam turbine generator, characterized in that: include: A machine-end shaft voltage acquisition device, an excitation-end shaft voltage acquisition device and a remote control display device, wherein the remote control display device is wirelessly connected to the machine-end shaft voltage acquisition device and the excitation-end shaft voltage acquisition device respectively.

2. A device for testing shaft voltage of a steam turbine generator according to claim 1, characterized in that: The machine-end shaft voltage collection device and the excitation-end shaft voltage collection device both comprise: a data collection end (1) and a telescopic mechanism, wherein the data collection end (1) is connected to the telescopic end of the telescopic mechanism, and a plurality of connecting pieces are arranged outside the fixed end of the telescopic mechanism, and the connecting pieces are used to be connected to the outer casing of the generator (8) above the main shaft of the machine end or the excitation end of the generator (8).

3. The device for testing shaft voltage of a steam turbine generator according to claim 1, characterized in that: The telescopic mechanism includes: A fixed cylinder (3), wherein a telescopic track (5) parallel to the axial direction of the fixed cylinder (3) is arranged inside the fixed cylinder (3), the telescopic rod (2) slides along the direction of the telescopic track (5) and penetrates one end of the fixed cylinder (3), the data acquisition end (1) is connected to the end of the telescopic rod (2) located outside the fixed cylinder (3), and the connecting piece is arranged outside the fixed cylinder (3); The first screw rod (4) is axially arranged parallel to the fixed tube (3), the first screw rod (4) is rotatably connected in the fixed tube (3), the first screw rod (4) is driven to rotate by a driving device, the sliding buckle (11) is threadedly connected to the first screw rod (4), the sliding buckle (11) is slidably connected to the telescopic track (5), and the sliding buckle (11) is fixedly connected to the telescopic rod (2).

4. The device for testing shaft voltage of a steam turbine generator according to claim 3, characterized in that: The drive unit includes: A motor control compartment (7) is fixedly connected to one side of the fixed cylinder (3), a motor (8) is arranged in the motor control compartment (7), a gear compartment (10) is fixedly connected to an end of the fixed cylinder (3) away from the data acquisition end (1), a first gear (91) and a second gear (92) are arranged in the gear compartment (10), the first gear (91) is fixed to the output shaft of the motor (8), the second gear (92) is fixedly connected to the first screw rod (4), a motor (8) main control board is arranged in the motor control compartment (7), the motor (8) main control board is wirelessly connected to the remote control display device, and the motor (8) main control board is used to control the motor (8).

5. The device for testing shaft voltage of a steam turbine generator according to claim 3, characterized in that: The connecting piece is a strong magnet (6).

6. The device for testing shaft voltage of a steam turbine generator according to claim 3, characterized in that: The data collection terminal (1) includes: An insulating outer groove (18) and an insulating inner groove (16), wherein the insulating inner groove (16) is arranged inside the insulating outer groove (18), and a spring (15) is fixedly connected between the insulating inner groove (16) and the insulating outer groove (18), and the insulating inner groove (16) is connected to a carbon brush (12) fixing assembly, the carbon brush (12) fixing assembly is used to fix the carbon brush (12), the carbon brush (12) is used to contact the main shaft to collect potential data, and the carbon brush (12) is connected to a carbon brush lead (17); The data acquisition mainboard compartment (14) is connected to the insulating outer groove (18), a carbon brush (12) data sampling mainboard is arranged in the data acquisition mainboard compartment (14), a carbon brush lead (17) is electrically connected to the carbon brush (12) data sampling mainboard, and the carbon brush (12) data sampling mainboard is wirelessly connected to the remote control display device.

7. The device for testing shaft voltage of a steam turbine generator according to claim 6, characterized in that: Track notches are respectively arranged on opposite sides of the insulating outer groove (18), and the track notches are connected to the carbon brush (12) fixing assembly in a one-to-one correspondence. The carbon brush (12) fixing assembly comprises: a second screw (13), the second screw (13) thread penetrates the corresponding side wall of the insulating inner groove (16), one end of the second screw (13) located in the insulating inner groove (16) is connected to an insulating plate, and the insulating plate is used to clamp the carbon brush (12), and the second screw (13) is slidably connected in the track notch along an axial direction parallel to the insulating outer groove (18).

8. The device for testing shaft voltage of a steam turbine generator according to claim 1, characterized in that: Also includes: A first distance detection device, used for detecting the vertical distance between the lower end outer wall of the insulating inner groove (16) and the lower end inner wall of the insulating outer groove (18); An angle detection device, used for detecting the angle between the lower end of the insulating inner groove (16) and the horizontal direction; A timer, used for timing the working time of the device for testing the shaft voltage of the steam turbine generator; A vibration detection device, detachably connected to the insulating inner groove (16); A third acquisition module is used to acquire an allowable contact force range between the carbon brush (12) and the steam turbine generator shaft corresponding to the current steam turbine generator shaft and the carbon brush (12); The first distance detection device, the vibration detection device, and the angle detection device are wirelessly connected to the remote control display device, and the remote control display device is also electrically connected to the third acquisition module and the timer. The remote control display device controls the motor (8) based on the third acquisition module, the timer, the vibration detection device, and the angle detection device, and includes: Step S1: selecting a number of target contact forces from the allowable contact force range between the carbon brush (12) and the shaft of the steam turbine generator according to a preset contact force interval from small to large, wherein the target contact force is greater than or equal to the minimum contact force of the allowable contact force range between the carbon brush (12) and the shaft of the steam turbine generator and is less than the maximum contact force; Step S2: Controlling the motor (8) to work so that the actual contact force between the carbon brush (12) and the shaft of the steam turbine generator is respectively subjected to contact evaluation detection at different target contact forces, each contact evaluation detection is performed for a first set duration, and during each contact evaluation detection process, the first distance detection device, the angle detection device and the vibration device are controlled to detect multiple times; constructing an actual potential data change curve and an angle detection device detection value change curve; the actual potential data change curve has a horizontal coordinate of time and a vertical coordinate of potential data obtained based on the carbon brush (12); the angle detection device detection value change curve has a horizontal coordinate of time and a vertical coordinate of the angle detection device detection value; Calculate the evaluation result of the contact evaluation detection based on the detection values ​​of the first distance detection device and the vibration device and the angle detection device during each contact evaluation detection process; When the evaluation result of the contact evaluation detection is greater than or equal to the corresponding reference evaluation result, the test is stopped, and the target contact force corresponding to the time of stopping the test is used as the set contact force corresponding to the current steam turbine generator shaft and the carbon brush (12); Step S3: The current turbine generator shaft and the carbon brush (12) are tested with the set contact force during the subsequent voltage test.

9. The device for testing shaft voltage of a steam turbine generator according to claim 1, characterized in that: Also includes: A first distance detection device, used for detecting the vertical distance between the lower end outer wall of the insulating inner groove (16) and the lower end inner wall of the insulating outer groove (18); The first acquisition module is used to acquire the material parameters and speed parameters of the current steam turbine generator shaft; A second acquisition module, used to acquire material and size parameters of the carbon brush (12); A first calculation module, used for calculating the maximum allowable contact force between the carbon brush (12) and the turbine generator shaft based on the first acquisition module and the second acquisition module; G0 is the maximum allowable wear parameter of the turbine generator shaft corresponding to its own material and rotation speed; h is the hardness of the carbon brush (12) material, ∈ is the elongation at break of the carbon brush (12) material, R1 is the radius of the contact portion of the turbine generator shaft with the carbon brush (12), a is the area of ​​the contact portion of the carbon brush (12) with the turbine generator shaft, is the curvature coefficient of the portion of the steam turbine generator shaft in contact with the carbon brush (12); E1 and θ1 are the elastic modulus and Poisson's ratio of the carbon brush (12), respectively; E2 and θ2 are the elastic modulus and Poisson's ratio of the portion of the steam turbine generator shaft in contact with the carbon brush (12), respectively; π is 3.14; γ1 is the aging coefficient of the carbon brush (12); e is a natural constant; A second calculation module, used for calculating the minimum allowable detection value of the first distance detection device corresponding to each spring based on the first calculation module; H is the minimum allowable detection value of the first distance detection device corresponding to each spring, H0 is the detection value of the first distance detection device when the spring is not compressed; G1 is the resultant force of other components that can generate force on the spring along the compression direction of the spring, in addition to the force of the turbine generator shaft on the carbon brush (12); K is the elastic coefficient of the spring; U is the total number of springs; The first alarm is used to alarm when the actual detection value of the first distance detection device is less than or equal to the minimum allowable detection value of the first distance detection device.

Images