Device for detecting insulator resistance of excitation tile of generator

Abstract

The invention relates to the technical field of resistance detection, in particular to a generator excitation tile insulator resistance detection device which comprises a main box body, a supporting plate and a cleaning structure, a box cover is rotatably hinged to the outer side of the main box body, a control cover plate is detachably connected to the top in the main box body, and the supporting plate is fixedly connected with the inner wall of the box cover. An air cylinder is fixedly connected to the supporting plate, and an output shaft of the air cylinder is fixedly connected with a connecting plate. According to the invention, the cleaning structure is utilized to comprehensively clean the wiring terminal, so that dust and some greasy dirt are completely removed, stable connection of the wiring terminal is ensured, and poor contact is prevented from causing data errors or abnormal signal transmission; the dust cleaning and oil stain removal of the wiring terminal are completed through the brush assembly and the oil stain removal assembly respectively, and the drying of the wiring terminal is completed through the heating assembly after the oil stain removal, so that the detection is conveniently and quickly performed, and the detection efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance detection, and more particularly to a device for detecting the resistance of the insulator of the excitation tile of a generator. Background Art

[0002] During the normal operation of a generator, due to reasons such as the misalignment of the stator and rotor and the residual magnetism of the rotor, a voltage is induced on the large shaft of the rotor, which is called the shaft voltage. To limit the amplitude of the shaft voltage, a grounding brush is usually installed inside the base of the steam-side bearing bush to ground the rotating shaft and make it close to zero potential. Since the excitation-end bearing bush is subjected to the shaft voltage, the bearing bush, the sealing bush and other components are insulated from the ground. When the insulation is too low, the shaft voltage forms a circulating current through the grounding of the excitation-end bearing bush, causing damage to the bearing bush and even the entire generator. Therefore, it is very important to detect the insulation resistance at the excitation bearing bush.

[0003] Currently, when detecting the resistance of the insulator of the excitation bearing bush, first, the generator needs to be powered off, and the various wirings of its terminals need to be contacted. Then, the terminals are wiped and cleaned, and then an insulation meter or a multimeter is used to detect them. However, since the terminals of the generator are generally concentrated in a terminal box, it is rather laborious to wipe and clean them manually. Generally, only the dust adhering to the surface of the terminals is removed, but it is difficult to remove the oil stain manually. When the oil stain covers the test point or the electrode contact surface, it will increase the contact resistance and even cause poor contact, resulting in data errors or abnormal signal transmission. Therefore, a detection device is needed to solve this problem. Summary of the Invention

[0004] In order to solve the problem that the terminals are not thoroughly cleaned before detecting the resistance of the insulator of the excitation bearing bush of the existing generator, resulting in poor contact of the test point or the electrode contact surface, causing data errors or abnormal signal transmission, the present invention provides a device for detecting the resistance of the insulator of the excitation bearing bush of a generator.

[0005] The device for detecting the resistance of the insulator of the excitation bearing bush of a generator provided by the present invention adopts the following technical solutions: A device for detecting the resistance of the insulator of the excitation bearing bush of a generator, comprising: A main box body, on the outer side of which a box cover is rotatably hinged, and a control cover plate is detachably connected to the inner top of the main box body; A support plate, which is fixedly connected to the inner wall of the box cover. A cylinder is fixedly connected to the support plate, and an output shaft of the cylinder is fixedly connected to a connecting plate; A cleaning structure, which is slidably connected to the support plate. The cleaning structure includes a brush assembly for cleaning dust, a degreasing component for removing oil stains and rotating synchronously with the brush assembly, and a heating component for drying after cleaning. There are multiple groups of the cleaning structures, and all of them are arranged on the connecting plate. The degreasing component and the degreasing component are located inside the brush assembly.

[0006] By adopting the above technical solution, the cleaning structure is used to comprehensively clean the wiring terminal, ensuring that dust and some oil stains are completely removed, guaranteeing the stable connection at the wiring terminal, preventing poor contact, and causing data errors or abnormal signal transmission. Specifically, the dust cleaning and oil stain removal of the wiring terminal are respectively completed by the brush assembly and the oil stain removal assembly, and after the oil stain removal, the heating assembly is used to complete the drying of the wiring terminal, so as to facilitate rapid detection and improve the efficiency and quality of detection.

[0007] Optionally, the brush assembly includes a sleeve, an outer rotating rod, a spring and a brush head. There are multiple sleeves arranged in a rectangular array on the connecting plate. A motor for driving the outer rotating rod to rotate is arranged inside the sleeve. The outer rotating rod is movably connected to the sleeve. The spring is connected between the outer rotating rod and the brush head. A plurality of arc-shaped through grooves are equidistantly arranged on the outer wall of the brush head. The bristles are fixedly connected to the outer wall of the brush head and are arranged outside the arc-shaped through grooves.

[0008] By adopting the above technical solution, the dust on the surface of the terminal is swept off by the bristles on the brush head. The applicability of the brush head is improved through the spring, and it is convenient to cooperate with the heating assembly for the drying operation.

[0009] Optionally, the oil stain removal assembly includes a storage leakage plate and a suction sponge. A cavity is arranged inside the brush head. The storage leakage plate is detachably connected to the side of the brush head away from the bristles. The suction sponge is clamped inside the storage leakage plate.

[0010] By adopting the above technical solution, the suction sponge is used to store the cleaning agent, and the cleaning agent is sprinkled on the wiring terminal as the brush head rotates.

[0011] Optionally, a plurality of through holes are arranged in a rectangular array on the surface of the storage leakage plate. The suction sponge is soaked in the cleaning agent before use.

[0012] By adopting the above technical solution, the through holes facilitate the flow of the cleaning agent.

[0013] Optionally, the heating assembly includes a heating tube, a wiring sliding rod, a power supply and a conductive sheet. The heating tube is installed in the internal cavity of the brush head. The wiring sliding rod is located inside the spring, and one end of it is fixedly connected to the brush head, and the other end extends into the outer rotating rod and is synchronously rotatably connected to the outer rotating rod. The power supply is detachably connected inside the outer rotating rod. The conductive sheet is fixedly connected to one end of the wiring sliding rod.

[0014] By adopting the above technical solution, the heating tube is powered on by the contact between the conductive sheet and one electrode of the power supply, so as to complete the heating and drying of the wiring terminal.

[0015] Optionally, one end of the heating tube is electrically connected to an electrode of the power supply, and the other end is connected with a wire. The wire passes through the wiring slide rod and is fixedly connected to the conductive sheet, and the outer wall of the wiring slide rod is insulated.

[0016] By adopting the above technical solution, with the design between the heating tube and the power supply, the heating tube does not affect the work of the cleaning agent during the cleaning operation.

[0017] Optionally, a chute is provided on the inner wall of the outer rotating rod, and a limiting slide plate fixedly connected to the outer wall of the wiring slide rod and slidably connected to the chute is provided.

[0018] By adopting the above technical solution, the position of the wiring slide rod is limited by the limiting slide plate, so that it can rotate synchronously with the outer rotating rod and can also slide along the chute.

[0019] Optionally, a wiring terminal and a DC resistance adjusting knob are provided on the control cover plate.

[0020] By adopting the above technical solution, the wiring terminal is connected to the wiring terminal, and the DC current is controlled by the DC resistance adjusting knob.

[0021] Optionally, the wiring terminal is electrically connected to the wiring terminal in the generator terminal box.

[0022] By adopting the above technical solution, the stability of the data during detection is ensured.

[0023] Optionally, a buffer area is left between the power supply and the inner wall of one end of the outer rotating rod.

[0024] By adopting the above technical solution, it is prevented that when the power supply contacts the conductive sheet too violently, a direct collision occurs between the power supply and the inner wall of the outer rotating rod.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The cleaning structure is used to comprehensively clean the wiring terminal, ensuring that dust and some oil stains are completely removed, guaranteeing the stable connection at the wiring terminal, preventing poor contact, resulting in data errors or abnormal signal transmission. Specifically, the dust cleaning and oil stain removal of the wiring terminal are respectively completed by the brush assembly and the oil stain removal assembly, and after the oil stain removal, the wiring terminal is dried by the heating assembly, so as to facilitate rapid detection and improve the efficiency and quality of detection; 2. The brush assembly, the oil stain removal assembly and the heating assembly are integrated in a cleaning structure, making full use of space and reducing the complex connection between the three, saving costs while ensuring the cleaning quality; 3. Before cleaning the wiring terminal, the detection device does not need to be cleaned manually, greatly reducing the cleaning difficulty and reducing the manual burden, meeting the usage requirements of people. Description of the Drawings

[0026] Figure 1 It is a schematic three - dimensional structure diagram of a generator excitation tile insulator resistance detection device in this embodiment.

[0027] Figure 2 It is Figure 1 the enlarged structure diagram at position A in

[0028] Figure 3 It is a schematic structure diagram of a cleaning monomer in this embodiment.

[0029] Figure 4 It is a schematic bottom view structure diagram of a cleaning monomer in this embodiment.

[0030] Figure 5 It is Figure 4 the sectional structure diagram in the B - B direction in

[0031] Figure 6 It is a schematic sectional structure diagram of a material storage leak plate in this embodiment.

[0032] Figure 7 It is a schematic three - dimensional structure diagram of a generator in this embodiment.

[0033] Explanation of reference numerals: 1. Main box body; 11. Box cover; 12. Control cover plate; 13. Terminal; 14. DC resistance adjustment knob; 2. Support plate; 21. Cylinder; 3. Cleaning structure; 31. Connecting plate; 32. Sleeve; 33. Outer rotating rod; 34. Spring; 35. Brush head; 351. Brush bristles; 36. Material storage leak plate; 361. Suction sponge; 362. Heating tube; 363. Wiring slide bar; 364. Limit slide plate; 365. Power supply; 366. Conductive sheet; 4. Wiring terminal. Detailed implementation manners

[0034] The following further elaborates on the present invention in conjunction with the attached Figures 1 - 7 drawings.

[0035] An embodiment of the present invention discloses a generator excitation tile insulator resistance detection device.

[0036] It should be noted that in the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] Reference Figure 1 and Figure 2 , a detecting device for the insulation resistance of the excitation tile of a generator, comprising: A main box body 1, on the outer side of which a box cover 11 is rotatably hinged. A control cover plate 12 is detachably connected to the inner top of the main box body 1, and a multimeter is arranged inside the main box body 1; A support plate 2, which is fixedly connected to the inner wall of the box cover 11. A cylinder 21 is fixedly connected to the support plate 2, and the output shaft of the cylinder 21 is fixedly connected to a connecting plate 31. It should be noted that there is a button on the control cover plate 12 for controlling the operation of the cylinder 21; A cleaning structure 3, which is slidably connected to the support plate 2. The cleaning structure 3 includes a brush assembly for cleaning dust, a degreasing component for removing oil stains and rotating synchronously with the brush assembly, and a heating component for drying after cleaning. There are multiple groups of the cleaning structure 3 and they are all arranged on the connecting plate 31. The degreasing component and the degreasing component are located inside the brush assembly; There are a terminal block 13 and a DC resistance adjustment knob 14 on the control cover plate 12. The terminal block 13 is electrically connected to the terminal 4 in the generator terminal box, and is used to detect the value of the insulation resistance of the excitation tile under different DC current states.

[0038] Specifically, the detection device is divided into the following detection steps when performing detection: Before detection, clean the generator terminal 4. Specifically, clean the dust on the surface and around the terminal 4 through the brush assembly, clean the oil stains on the surface and around the terminal 4 through the degreasing component, and heat and dry the surface and around the terminal 4 through the heating component for subsequent rapid detection; During detection, first disconnect the neutral point grounding strip, connect the "L" terminal block 13 of the multimeter to the terminal 4, and connect the "E" terminal block 13 to the generator housing or the large shaft, and observe the change of the multimeter value under different currents. Then disconnect the excitation switch and the power supply of the excitation circuit, connect the "L" terminal to the positive / negative of the generator slip ring, and connect the "E" terminal to the large shaft of the generator rotor. Also rotate the DC resistance adjustment knob 14 to adjust the DC current, observe the change of the value. After 15 seconds, read the initial value (R15) and after 60 seconds, read the stable value (R60) under the same current for both operations, calculate the absorption ratio (R60 / R15≥1.3 is qualified). If the absorption ratio is abnormal, extend the measurement to 10 minutes and calculate the polarization index (R10min / R1min≥2.0).

[0039] Reference Figure 2 - Figure 6, Specifically, in the embodiment of the present invention, the brush assembly includes a sleeve 32, an outer rotating rod 33, a spring 34, and a brush head 35. A plurality of sleeves 32 are provided and are arranged in a rectangular array on the connecting plate 31. A motor for driving the outer rotating rod 33 to rotate is provided inside the sleeve 32. The outer rotating rod 33 is movably connected to the sleeve 32. The spring 34 is connected between the outer rotating rod 33 and the brush head 35. A plurality of arc-shaped through grooves are equidistantly formed on the outer wall of the brush head 35. The bristles 351 are fixedly connected to the outer wall of the brush head 35 and are arranged outside the arc-shaped through grooves. A chute is formed on the inner wall of the outer rotating rod 33. A limiting slide plate 364 slidably connected to the chute is fixedly connected to the outer wall of the wiring slide rod 363.

[0040] In the embodiment of the present invention, during use, the brush head 35 is inserted into the generator terminal box, and one end of the brush head 35 does not abut against the inner wall of the generator terminal box. At this time, the motor drives the outer rotating rod 33 to rotate, and the outer rotating rod 33 drives the brush head 35 to rotate. The bristles 351 on the brush head 35 clean the surface and nearby dust of the wiring terminal 4, and sweep the dust from the arc-shaped through grooves into the brush head 35 to reduce the possibility of reattachment to the wiring terminal 4. Among them, it should be noted that an adsorption film can be pasted on the inner wall of the brush head 35 to adsorb the dust.

[0041] Refer to Figure 5 and Figure 6 , Specifically, in the embodiment of the present invention, the oil removal assembly includes a storage and leakage plate 36 and a suction sponge 361. A cavity is provided inside the brush head 35. The storage and leakage plate 36 is detachably connected to the side of the brush head 35 away from the bristles 351. The suction sponge 361 is clamped inside the storage and leakage plate 36. A plurality of through holes are arranged in a rectangular array on the surface of the storage and leakage plate 36. The suction sponge 361 is soaked with a cleaning agent before use.

[0042] In the embodiment of the present invention, during oil stain cleaning, the brush head 35 is rotated so that the opening of the arc-shaped through groove is adjusted downward. At this time, the moving state of the brush head 35 is stationary, which is convenient for the cleaning agent on the suction sponge 361 to flow out from the through holes under the action of gravity until it flows onto the surface of the wiring terminal 4 and contacts the oil stain on the surface of the wiring terminal 4. After contact, the brush head 35 is rotated again to clean the oil stain. After each cleaning, the suction sponge 361 can be taken out and replaced. At the same time, the cylinder 21 works reciprocally to make the cleaning agent fully contact the wiring terminal 4. It should be noted that during the movement process, one end of the brush head 35 does not abut against the inner wall of the generator terminal box, and the cleaning agent uses an insulating cleaning agent, such as WD precision electrical cleaning agent.

[0043] Refer to Figure 4 and Figure 5, Specifically, in the embodiment of the present invention, the heating component includes a heating tube 362, a wiring slide bar 363, a power source 365, and a conductive sheet 366. The heating tube 362 is installed in the inner cavity of the brush head 35. The wiring slide bar 363 is located inside the spring 34, and one end of it is fixedly connected to the brush head 35, and the other end extends into the inner part of the outer rotating rod 33 and is rotatably connected to the outer rotating rod 33 synchronously. The power source 365 is detachably connected inside the outer rotating rod 33. The conductive sheet 366 is fixedly connected to one end of the wiring slide bar 363. One end of the heating tube 362 is electrically connected to one electrode of the power source 365, and the other end is connected with a wire. The wire passes through the wiring slide bar 363 and is fixedly connected to the conductive sheet 366. The outer wall of the wiring slide bar 363 is insulated, and there is a buffer area between the power source 365 and the inner wall of one end of the outer rotating rod 33.

[0044] In the embodiment of the present invention, after the oil stain is removed, the movement of the cylinder 21 is changed to control the sliding of the connecting plate 31 until one end of the brush head 35 abuts against the inner wall of the generator terminal box, compressing the spring 34, so that the wiring slide bar 363 slides, and the conductive sheet 366 contacts the power source 365, and finally forms a closed loop with the heating tube 362. The heating tube 362 works, and the heat is dissipated through the arc-shaped through groove. At the same time, the motor works to control the rotation of the brush head 35 to perform heating and drying around the wiring terminal 4, so as to realize the rapid drying around the wiring terminal 4, thereby shortening the detection time.

[0045] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A generator excitation shoe insulator resistance detection device, characterized in that: include: A main box body (1) has a box cover (11) rotatably hinged on its outer side, and a control cover plate (12) is detachably connected to the top of the main box body (1); A support plate (2) fixedly connected to the inner wall of the box cover (11), a cylinder (21) fixedly connected to the support plate (2), and an output shaft of the cylinder (21) fixedly connected to a connecting plate (31); A cleaning structure (3) is slidably connected to the support plate (2), the cleaning structure (3) comprising a brush assembly for sweeping dust, a degreasing assembly for removing oil and rotating synchronously with the brush assembly, and a heating assembly for drying after cleaning, the cleaning structure (3) being provided with a plurality of groups and all of which are arranged on the connecting plate (31), the degreasing assembly and the degreasing assembly being located inside the brush assembly.

2. A generator excitation shoe insulator resistance detection device according to claim 1, characterized in that: The brush assembly comprises a sleeve (32), an outer rotating rod (33), a spring (34) and a brush head (35); the sleeve (32) is provided with a plurality of bristles arranged in a rectangular array on a connecting plate (31); a motor for driving the outer rotating rod (33) to rotate is arranged in the sleeve (32); the outer rotating rod (33) is movably connected to the sleeve (32); the spring (34) is connected between the outer rotating rod (33) and the brush head (35); a plurality of arc-shaped through grooves are equidistantly formed on the outer wall of the brush head (35); and the bristles (351) are fixedly connected to the outer wall of the brush head (35) and arranged outside the arc-shaped through grooves.

3. A generator excitation shoe insulator resistance detection device according to claim 1, characterized in that: The degreasing component comprises a material storage leakage plate (36) and a material absorption sponge (361); a cavity is provided inside the brush head (35); the material storage leakage plate (36) is detachably connected to a side of the brush head (35) away from the bristles (351); and the material absorption sponge (361) is clamped inside the material storage leakage plate (36).

4. A generator excitation shoe insulator resistance detection device according to claim 3, characterized in that: The surface of the material storage leaking plate (36) has a plurality of through holes in a rectangular array, and the material absorption sponge (361) is soaked in a cleaning agent before use.

5. The generator excitation shoe insulator resistance detection device according to claim 1, characterized in that: The heating assembly comprises a heating tube (362), a wiring slide rod (363), a power source (365) and a conductive sheet (366); the heating tube (362) is installed in the internal cavity of the brush head (35); the wiring slide rod (363) is located on the inner side of the spring (34), and one end of the wiring slide rod is fixedly connected to the brush head (35), and the other end extends to the inside of the outer rotating rod (33) and is synchronously rotatably connected to the outer rotating rod (33); the power source (365) is detachably connected to the inside of the outer rotating rod (33); and the conductive sheet (366) is fixedly connected to one end of the wiring slide rod (363).

6. A generator excitation shoe insulator resistance detection device according to claim 5, characterized in that: One end of the heating tube (362) is electrically connected to an electrode of the power source (365), and the other end is connected to a wire, which passes through a wiring slide bar (363) and is fixedly connected to a conductive sheet (366), and the outer wall of the wiring slide bar (363) is insulated.

7. A generator excitation shoe insulator resistance detection device according to claim 2, characterized in that: The inner wall of the outer rotating rod (33) is provided with a sliding groove, and the outer wall of the connecting sliding rod (363) is fixedly connected with a limiting sliding plate (364) which is slidably connected to the sliding groove.

8. The generator excitation shoe insulator resistance detection device according to claim 1, characterized in that: The control cover plate (12) is provided with a terminal post (13) and a DC resistance adjustment knob (14).

9. A generator excitation shoe insulator resistance detection device according to claim 8, characterized in that: The terminal post (13) is electrically connected to the terminal (4) in the generator terminal box.

10. The generator excitation shoe insulator resistance detection device according to claim 5, characterized in that: A buffer zone is provided between the power source (365) and the inner wall of one end of the outer rotating rod (33).

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