Testing device and testing method for potential to ground of hand-wrapped insulation surface at end part of stator

Abstract

The invention provides a ground potential test device and test method for a hand-wrapped insulation surface of a stator end portion, and relates to the technical field of electrical detection, the ground potential test device comprises an insulation operating rod, a clamping part is installed at the working end of the insulation operating rod, conductive fiber cloth is arranged on the clamping part, and the clamping part is used for clamping the hand-wrapped insulation end portion of the stator. The insulation operating rod is provided with a current and voltage meter, the current and voltage meter is electrically connected with the clamping part, and the current and voltage meter is used for displaying the ground voltage and the leakage current of the surface of the hand-wrapped insulation end part of the detected stator. Opening and closing can be controlled by the manual operation handle at the tail of the insulation operation rod, measurement of the surface voltage to ground and leakage current of the hand-wrapped insulation end of the stator is achieved, the test time and steps are reduced, the test precision is improved, meanwhile, pollution to the interior of the stator is avoided, potential safety hazards of generator operation are avoided, and the service life of the generator is prolonged. According to the invention, the insulation defect area can be rapidly and accurately determined according to the change of the surface voltage to ground and the leakage current in the test process.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical detection, and in particular relates to a stator end hand-wrapped insulation surface to ground potential test device and test method. Background Art

[0002] Prior art publication number CN 105093073 A A method for testing the ground potential of a generator hand-wrapped insulation, the method comprising: S1. Wrapping the end of the generator stator hand-wrapped insulation with tin foil; S2. Installing a pointed conductor on the connecting conductor at the top of the high-voltage insulating support rod to test the ground potential of the generator stator hand-wrapped insulation end; S3. Determining whether the ground potential of the generator stator hand-wrapped insulation end is within a preset range, if it is within the preset range, executing S4; otherwise, installing the spherical voltage sensor or the cylindrical voltage sensor on the connecting conductor at the top of the high-voltage insulating support rod to locate the fault point; S4. Installing a plate-shaped voltage sensor on the connecting conductor at the top of the high-voltage insulating support rod to test the ground potential of the involute part hand-wrapped insulation; This method requires manual wrapping and disassembly of tinfoil, which is time-consuming and laborious. When the tinfoil is removed after the test, tinfoil fragments will inevitably be left in the generator chamber, contaminating the inside of the stator. At the same time, due to the high height of the upper part of the stator, the upper position requires the test personnel to enter the inside of the stator to wrap the tinfoil, which inevitably contaminates the inside of the stator and poses a hidden danger to the operation of the generator. At the same time, if there is a defect at the end of the stator and leakage current occurs, the traditional tinfoil wrapping method can only determine the winding where the leakage current occurs, and cannot accurately determine the location of the leakage current. The location of the leakage current still needs to be determined by subsequent tests. The traditional tinfoil wrapping method often increases measurement errors due to loose tinfoil wrapping. Summary of the invention

[0003] The present invention provides a stator end hand-wrapped insulation surface to ground potential test device and test method, which are used to solve at least one of the above-mentioned technical problems.

[0004] In order to solve the above technical problems, the present invention discloses a stator end hand-wrapped insulation surface-to-ground potential test device, comprising an insulating operating rod, a clamping component is installed at the working end of the insulating operating rod, a conductive fiber cloth is provided on the clamping component, the clamping component is used to clamp the stator hand-wrapped insulation end, and an ammeter and voltmeter are provided on the insulating operating rod, the ammeter and voltmeter are electrically connected to the clamping component, and the ammeter and voltmeter are used to display the surface-to-ground voltage and leakage current of the stator hand-wrapped insulation end being tested.

[0005] Preferably, the clamping component includes a positioning pin, a fixed clamping plate and a movable clamping plate, the positioning pin is fixedly connected to the insulating operating rod, the fixed clamping plate is fixedly connected to the positioning pin, the movable clamping plate is rotatably connected to the positioning pin, a reset spring is provided in the positioning pin, and the opening and closing of the fixed clamping plate and the movable clamping plate are realized by the action of the reset spring, and the two ends of the conductive fiber cloth are connected to the openings of the fixed clamping plate and the movable clamping plate; Supporting silica gel is filled between the conductive fiber cloth and the fixed splint and the movable splint.

[0006] Preferably, a fixed rotating shaft is provided on the insulating operating rod, and a manual operating handle is rotatably connected to the fixed rotating shaft. An insulating rope is fixedly connected to one end of the manual operating handle, and the insulating rope passes through the insulating operating rod and is connected to the movable splint.

[0007] Preferably, the insulating operating rod is an internally hollow retractable rod, and the insulating operating rod is made of glass fiber reinforced plastic epoxy resin.

[0008] Preferably, the insulating rope is made of either silk or glass fiber; The fixed splint and the movable splint are made of epoxy resin material.

[0009] Preferably, the clamping component is provided with a conductive fiber cloth retracting and releasing switching assembly, which comprises an intermediate pressure roller, an unwinding electric roller and a rewinding electric roller, wherein the intermediate pressure roller is installed in the middle of the clamping component, the unwinding electric roller and the rewinding electric roller are installed on detachable mounting covers of the fixed clamping plate and the movable clamping plate respectively, the detachable mounting cover is detachably connected to the fixed clamping plate or the movable clamping plate, a roller cover is fixedly connected to the detachable mounting cover corresponding to the fixed clamping plate and the movable clamping plate, and a scraper is slidably connected to the inlet of the roller cover corresponding to the movable clamping plate; The unwinding motorized roller and the winding motorized roller are connected by a cloth roll formed by intermittent splicing of conductive fiber cloth and cleaning cloth. The cloth roll is outputted by the unwinding motorized roller, passes over the middle pressure roller and is finally wound around the winding motorized roller.

[0010] Preferably, both the fixed clamping plate and the movable clamping plate of the clamping component are provided with clamping components; The clamping assembly includes a sliding guide table, and the two sliding guide tables are respectively fixedly connected in the fixed clamping plate and the movable clamping plate. A U-shaped clamping frame is slidably connected in the sliding guide table, and the two U-shaped clamping frames respectively penetrate the fixed clamping plate and the movable clamping plate. Both ends of the U-shaped clamping frame are respectively fixedly connected to a table body, an electromagnet 1 is fixedly connected to the table body, and an electromagnet 2 is fixedly connected to the sliding guide table. Electromagnet power supplies are provided in the fixed clamping plate and the movable clamping plate, and the electromagnet power supply is used to power electromagnet 1 and electromagnet 2. A clamping elastic member is sleeved on the U-shaped clamping frame, and the clamping elastic member is located between electromagnet 1 and electromagnet 2.

[0011] Preferably, a micro camera is provided on the clamping component, and the micro camera is used to collect real-time test images. The micro camera is connected to a mobile terminal for communication. The mobile terminal establishes a three-dimensional image of the insulation end of the current stator hand package based on the real-time test images. The mobile terminal communicates and simultaneously receives the detection results of the current and voltage meter, and corresponds each frame of the collected real-time test images to the detection value of the current and voltage meter, so as to quickly mark the abnormal position.

[0012] Preferably, a mounting slot is provided in the middle of the working surfaces of the fixed splint and the movable splint, and a T-shaped convex strip is provided on the contact surface between the supporting silica gel and the fixed splint and the movable splint, and the T-shaped convex strip is slidably connected in the mounting slot.

[0013] A method for testing the ground potential of the hand-wrapped insulation surface of a stator end, comprising the following steps: S1. Before the test begins, determine the length of the insulating operating rod according to the voltage level of the generator under test and the position of the stator hand insulation to ensure a safe distance between the stator of the generator under test and the test personnel during the test; S2. Connect the ground wire of the current and voltage meter to ensure that the ground wire of the current and voltage meter is flexible and effectively connected without interfering with the test operation; S3. Use a DC high voltage generator to raise the stator voltage of the generator under test to the rated voltage; S4. The test personnel use the manual operating handle of the stator end hand-wrapped insulation surface-to-ground potential test device to control the opening and closing of the clamping component, and clamp the clamping component on one of the stator hand-wrapped insulation ends in turn, measure its surface-to-ground voltage and leakage current, and repeat this process in turn until all stator hand-wrapped insulation ends are tested; S5. After all tests are completed, adjust the voltage of the DC high-voltage generator, fully discharge the DC high-voltage generator and the generator stator, and return the stator end hand-wrapped insulation surface to ground potential test device to its original position.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The stator end hand-wrapped insulation surface-to-ground potential test device of the present invention can be controlled to open and close by a manual operating handle at the tail of the insulating operating rod, so that the clamping component can be clamped at the stator hand-wrapped insulation end, thereby realizing the measurement of the surface-to-ground voltage and leakage current of the stator hand-wrapped insulation end, reducing the test time and steps, improving the test accuracy, avoiding the cumbersome steps of wrapping with bare hands before the test and disassembling the tin foil after the test in the traditional method, thereby avoiding the situation of large measurement errors caused by loose tin foil wrapping, and also avoiding the pollution of the inside of the stator, avoiding the safety hazard of generator operation; (2) The present invention can quickly and accurately determine the insulation defect area according to the changes in the surface-to-ground voltage and leakage current during the test, solving the technical problem that the traditional method requires the entire section of tin foil to wrap the test end, which can only determine the defective end but cannot accurately determine the defective area of ​​the end; (3) The conductive fiber cloth of the clamping part of the device of the present invention is filled with supporting silicone between the fixed clamping plate and the movable clamping plate. The supporting silicone has certain elasticity and support, and is used to transmit the clamping force between the fixed clamping plate and the movable clamping plate during the test, so as to achieve the effect of quickly and evenly attaching the conductive fiber cloth to the insulating end of the stator hand package. At the same time, a certain pressure is applied to the conductive fiber cloth to ensure the pressure between the conductive fiber cloth and the insulating end of the stator hand package, reduce the surface contact resistance, and improve the test accuracy of the surface potential. At the same time, the elasticity of the supporting silicone itself can make the clamping part release the insulating end of the stator hand package and immediately return to its original state, so that the next measurement can be quickly carried out without the need for adjustment by the test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A schematic diagram of the working state of the present invention; Figure 3 This is a schematic diagram of the installation position of the conductive fiber cloth of the present invention; Figure 4 This is a schematic diagram of the structure of the conductive fiber cloth retracting and releasing switching component of the present invention; Figure 5 For the present invention Figure 4 A local enlarged view of point A; Figure 6 It is a schematic diagram of the structure of the clamping assembly of the present invention.

[0016] In the figure: 1. insulating operating rod; 2. fixed splint; 3. movable splint; 4. conductive fiber cloth; 5. supporting silicone; 6. positioning pin; 7. clamping component; 8. manual operating handle; 9. ammeter and voltmeter; 10. insulating rope; 11. fixed rotating shaft; 12. stator hand-wrapped insulating end; 13. conductive fiber cloth retracting and releasing switching assembly; 130. unwinding electric roller; 131. rewinding electric roller; 132. intermediate pressure roller; 133. detachable mounting cover; 134. roller cover; 135. scraper; 136. cloth roll; 14. clamping assembly; 140. sliding guide table; 141. U-shaped clamping frame; 142. table body; 143. electromagnet one; 144. electromagnet two; 145. clamping elastic member. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides a stator end hand-wrapped insulation surface to ground potential test device, such as Figure 1-6 As shown, it includes an insulating operating rod 1, a clamping component 7 is installed at the working end of the insulating operating rod 1, a conductive fiber cloth 4 is provided on the clamping component 7, the clamping component 7 is used to clamp the stator hand package insulation end 12, and an ammeter and voltmeter 9 is provided on the insulating operating rod 1. The ammeter and voltmeter 9 is electrically connected to the clamping component 7, and the ammeter and voltmeter 9 is used to display the surface-to-ground voltage and leakage current of the stator hand package insulation end 12 under test.

[0020] A method for testing the ground potential of the hand-wrapped insulation surface of a stator end, comprising the following steps: S1. Before the test begins, determine the length of the insulating operating rod 1 according to the voltage level of the generator under test and the position of the stator hand insulation to ensure a safe distance between the stator of the generator under test and the test personnel during the test; S2. Connect the ground wire of the current and voltage meter 9 to ensure that the ground wire of the current and voltage meter 9 is flexible and effectively connected without interfering with the test operation; S3. Use a DC high voltage generator to raise the stator voltage of the generator under test to the rated voltage; S4. The test personnel use the manual operating handle 8 of the stator end hand-wrapped insulation surface-to-ground potential test device to control the opening and closing of the clamping component 7, and clamp the clamping component 7 on one of the stator hand-wrapped insulation ends 12 in turn, measure its surface-to-ground voltage and leakage current, and repeat this process in turn until all stator hand-wrapped insulation ends 12 are tested; S5. After all tests are completed, adjust the voltage of the DC high-voltage generator, fully discharge the DC high-voltage generator and the generator stator, and return the stator end hand-wrapped insulation surface to ground potential test device to its original position.

[0021] Preferably, the insulating operating rod 1 is an internally hollow retractable rod, and the insulating operating rod 1 is made of glass fiber reinforced plastic epoxy resin.

[0022] The working principle and beneficial effects of the above technical solution are as follows: during operation, the staff adjusts the length of the insulating operating rod 1, and holds the insulating operating rod 1 so that the clamping component 7 clamps the stator hand package insulation end 12 to be tested, and the surface-to-ground voltage and leakage current of the stator hand package insulation end 12 to be tested can be displayed through the current and voltage meter 9; The insulating operating rod 1 is an internally hollow retractable rod, and the length of the insulating operating rod 1 can be adjusted according to the generators of different voltage levels, so as to ensure that the test personnel maintain a safe distance from the stator under test, and the epoxy resin material can prevent the insulating end 12 of the target stator hand package from contacting other stator hand package insulating ends 12 when testing the target stator hand package insulating end 12, resulting in measurement errors; The stator end hand-wrapped insulation surface-to-ground potential test device of the present invention can be controlled to open and close by a manual operating handle 8 at the tail of the insulating operating rod 1, so as to clamp the clamping component 7 at the stator hand-wrapped insulation end 12, thereby realizing the measurement of the surface-to-ground voltage and leakage current of the stator hand-wrapped insulation end 12, reducing the test time and steps, improving the test accuracy, avoiding the cumbersome steps of wrapping by hand before the test and disassembling the tin foil after the test in the traditional method, thereby avoiding the situation of large measurement errors caused by loose tin foil wrapping, and also avoiding the pollution of the inside of the stator, avoiding the safety hazard of the generator operation; The present invention can quickly and accurately determine the insulation defect area according to the changes in the surface-to-ground voltage and leakage current during the test, thereby solving the technical problem that the traditional method requires tin foil to wrap the entire test end, which can only determine the defective end but cannot accurately determine the end defect area.

[0023] Example 2 On the basis of Example 1, the clamping component 7 includes a positioning pin 6, a fixed clamping plate 2 and a movable clamping plate 3, the positioning pin 6 is fixedly connected to the insulating operating rod 1, the fixed clamping plate 2 is fixedly connected to the positioning pin 6, the movable clamping plate 3 is rotatably connected to the positioning pin 6, a reset spring is provided in the positioning pin 6, and the opening and closing of the fixed clamping plate 2 and the movable clamping plate 3 are realized by the action of the reset spring, and the two ends of the conductive fiber cloth 4 are connected to the openings of the fixed clamping plate 2 and the movable clamping plate 3; Supporting silica gel 5 is filled between the conductive fiber cloth 4 and the fixed clamping plate 2 and the movable clamping plate 3; A fixed shaft 11 is provided on the insulating operating rod 1 , and a manual operating handle 8 is rotatably connected to the fixed shaft 11 . An insulating rope 10 is fixedly connected to one end of the manual operating handle 8 . The insulating rope 10 passes through the insulating operating rod 1 and is connected to the movable clamping plate 3 .

[0024] Preferably, the insulating rope 10 is made of either silk or glass fiber; The fixed clamping plate 2 and the movable clamping plate 3 are made of epoxy resin material.

[0025] Preferably, a mounting groove is provided in the middle of the working surface of the fixed splint 2 and the movable splint 3, and a T-shaped convex strip is provided on the contact surface between the supporting silicone 5 and the fixed splint 2 and the movable splint 3, and the T-shaped convex strip is slidably connected in the mounting groove.

[0026] The working principle and beneficial effects of the above technical solution are as follows: when in use, the staff presses the end of the manual operating handle 8 away from the insulating rope 10, so that the manual operating handle 8 is tilted, the insulating rope 10 is tightened, and the movable clamping plate 3 at the other end of the insulating rope 10 rotates under the action of the tension, so that the movable clamping plate 3 rotates toward the end away from the fixed clamping plate 2, so as to realize the opening of the clamping component 7, and move the opened clamping component 7 to the insulating end 12 of the stator hand package to be tested, and test the insulating end 12 of the stator hand package. After the test is completed, the reset spring acts to realize the reset of the movable clamping plate 3; The conductive fiber cloth 4 of the clamping component 7 of the device of the present invention is filled with supporting silica gel between the fixed clamping plate 2 and the movable clamping plate 3. The supporting silica gel has certain elasticity and support, and is used to transmit the clamping force between the fixed clamping plate 2 and the movable clamping plate 3 during the test, so as to achieve the effect of quickly and evenly attaching the conductive fiber cloth 4 to the insulating end 12 of the stator hand package. At the same time, a certain pressure is applied to the conductive fiber cloth 4 to ensure the pressure between the conductive fiber cloth 4 and the insulating end 12 of the stator hand package, reduce the surface contact resistance, and improve the test accuracy of the surface potential. At the same time, the elasticity of the supporting silica gel itself can make the clamping component 7 release the insulating end 12 of the stator hand package and immediately return to its original state, so that the next measurement can be quickly carried out without the need for adjustment by the test personnel.

[0027] Example 3 On the basis of Example 1, a conductive fiber cloth retracting and releasing switching assembly 13 is provided on the clamping component 7, and the conductive fiber cloth retracting and releasing switching assembly 13 includes an intermediate pressure roller 132, an unwinding electric roller 130 and a winding electric roller 131, the intermediate pressure roller 132 is installed in the middle of the clamping component 7, the unwinding electric roller 130 and the winding electric roller 131 are respectively installed on the detachable mounting cover 133 of the fixed clamping plate 2 and the movable clamping plate 3, the detachable mounting cover 133 is detachably connected to the fixed clamping plate 2 or the movable clamping plate 3, and a roller cover 134 is fixedly connected to the detachable mounting cover 133 corresponding to the fixed clamping plate 2 and the movable clamping plate 3, and a scraper 135 is slidably connected to the inlet of the roller cover 134 corresponding to the movable clamping plate 3; The unwinding motorized roller 130 and the winding motorized roller 131 are connected by a cloth roll 136 formed by intermittent splicing of the conductive fiber cloth 4 and the cleaning cloth. The cloth roll 136 is outputted by the unwinding motorized roller 130 , passes over the intermediate pressure roller 132 , and is finally wound around the winding motorized roller 131 .

[0028] The working principle and beneficial effects of the above technical solution are as follows: when the gap between adjacent stator hand-wrapped insulation ends 12 of the stator under test is large, a cloth roll 136, i.e., a cloth roll 136 intermittently spliced ​​with a conductive fiber cloth 4 and a cleaning cloth, is used for testing, and a conductive fiber cloth retracting and releasing switching assembly 13 is used to install the cloth roll 136 accordingly; When the conductive fiber cloth retractable switching assembly 13 is used, the two detachable mounting covers 133 are respectively mounted on the fixed clamping plate 2 and the movable clamping plate 3. At this time, the intermediate pressure roller 132, the unwinding motorized roller 130 and the winding motorized roller 131 are all in corresponding positions. The cloth roll 136 is output through the unwinding motorized roller 130, and finally wound around the winding motorized roller 131 after crossing the intermediate pressure roller 132. Before the formal test, the unwinding motorized roller 130 and the winding motorized roller 131 are rotated so that the cleaning cloth part on the cloth roll 136 is located above the supporting silica gel. At this time, the insulating operating rod 1 is loosened by hand. , the cleaning cloth is wiped on the surface of the stator hand insulation end 12, and when the wiping is completed, the cleaning cloth that has just been wiped is collected into the rewinding electric roller 131 through the unwinding electric roller 130 and the rewinding electric roller 131. When entering the rewinding electric roller 131, the scraper 135 on the roller cover 134 scrapes off the larger impurities attached to the cleaning cloth. When the cleaning cloth is collected into the rewinding electric roller 131, the conductive fiber cloth 4 adjacent to it moves to the top of the supporting silica gel, and at this time, the ammeter 9 is electrically connected to the conductive fiber cloth 4, and the test is performed by operating the insulating operating rod 1.

[0029] Example 4 On the basis of Embodiment 3, a clamping assembly 14 is provided on both the fixed clamping plate 2 and the movable clamping plate 3 of the clamping component 7; The clamping assembly 14 includes a sliding guide platform 140, and the two sliding guide platforms 140 are respectively fixedly connected in the fixed splint 2 and the movable splint 3. A U-shaped clamping frame 141 is slidably connected in the sliding guide platform 140. The two U-shaped clamping frames 141 respectively penetrate the fixed splint 2 and the movable splint 3. Both ends of the U-shaped clamping frame 141 are respectively fixedly connected to a table body 142, and an electromagnet 1 143 is fixedly connected to the table body 142. An electromagnet 2 144 is fixedly connected to the sliding guide platform 140. An electromagnet power supply is provided in the fixed splint 2 and the movable splint 3. The electromagnet power supply is used to supply power to the electromagnet 1 143 and the electromagnet 2 144. A clamping elastic member 145 is sleeved on the U-shaped clamping frame 141, and the clamping elastic member 145 is located between the electromagnet 1 143 and the electromagnet 2 144.

[0030] The working principle and beneficial effects of the above technical solution are as follows: when the gap between adjacent stator hand-wrapped insulation ends 12 of the stator under test is small, the conductive fiber cloth 4 and the cleaning cloth are used alternately for testing, and the clamping assembly 14 is used to install the conductive fiber cloth 4 or the cleaning cloth accordingly; During cleaning, the cleaning cloth is installed on the clamping assembly 14. During testing, the conductive fiber cloth 4 is installed on the clamping assembly 14. Taking the conductive fiber cloth 4 as an example, after the conductive fiber cloth 4 passes through the middle pressure roller 132, its two ends are respectively installed on the fixed clamping plate 2 and the movable clamping plate 3 through the clamping assembly 14. Specifically, the electromagnet power supply supplies power to the electromagnet 1 143 and the electromagnet 2 144. The electromagnet 2 144 moves away from the electromagnet 1 143 under the action of the electromagnetic force, so that the U-shaped clamping frame 141 clamps the conductive fiber cloth 4. During disassembly, the electromagnet 1 143 and the electromagnet 2 144 lose power, and the U-shaped clamping frame 141 moves away from the fixed clamping plate 2 or the movable clamping plate 3 under the action of the clamping elastic member 145, thereby realizing the disassembly of the conductive fiber cloth 4. During the use of the conductive fiber cloth retracting and releasing switching assembly 13, the electromagnet 1 143 and the electromagnet 2 144 of the clamping assembly 14 are in a de-energized state.

[0031] Example 5 On the basis of Example 1, a micro camera is provided on the clamping component 7, and the micro camera is used to collect real-time test images. The micro camera is connected to the mobile terminal for communication. The mobile terminal establishes a three-dimensional image of the current stator hand package insulation end 12 based on the real-time test images. The mobile terminal communicates and simultaneously receives the detection results of the current and voltage meter 9, and corresponds each frame of the collected real-time test images to the detection value of the current and voltage meter, so as to quickly mark the abnormal position.

[0032] The working principle and beneficial effects of the above technical solution are as follows: the mobile terminal uses an image processing algorithm (such as multi-frame image reconstruction or stereo vision technology) to process the two-dimensional image transmitted by the micro camera into a three-dimensional model of the insulation end of the current stator hand package. The mobile terminal receives real-time current and voltage detection values, and synchronizes each frame of the image with the corresponding detection value through a timestamp. According to whether the detection value (such as voltage to ground or leakage current) exceeds the set threshold, the mobile terminal marks the abnormal position on the three-dimensional model or image. When the detection value exceeds the threshold range, the mobile terminal displays the abnormal point on the real-time test image, using color marks (such as red dots, red frames) or directly highlighting the corresponding position on the three-dimensional model. The micro camera collects the test image in real time and processes it synchronously with the detection value to achieve a one-to-one correspondence between the image and the data.

[0033] 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 stator end hand-wrapped insulation surface to ground potential test device, characterized by: The insulating operating rod (1) comprises an insulating operating rod (1), a clamping component (7) is installed at the working end of the insulating operating rod (1), a conductive fiber cloth (4) is provided on the clamping component (7), the clamping component (7) is used to clamp the stator hand package insulation end (12), an ammeter (9) is provided on the insulating operating rod (1), the ammeter (9) is electrically connected to the clamping component (7), and the ammeter (9) is used to display the surface-to-ground voltage and leakage current of the stator hand package insulation end (12) under test; The clamping component (7) comprises a positioning pin (6), a fixed clamping plate (2) and a movable clamping plate (3); the positioning pin (6) is fixedly connected to the insulating operating rod (1); the fixed clamping plate (2) is fixedly connected to the positioning pin (6); the movable clamping plate (3) is rotatably connected to the positioning pin (6); a reset spring is provided in the positioning pin (6); the fixed clamping plate (2) and the movable clamping plate (3) are opened and closed by the reset spring; and the two ends of the conductive fiber cloth (4) are connected to the openings of the fixed clamping plate (2) and the movable clamping plate (3); Supporting silica gel (5) is filled between the conductive fiber cloth (4) and the fixed clamping plate (2) and the movable clamping plate (3); A fixed rotating shaft (11) is provided on the insulating operating rod (1), and a manual operating handle (8) is rotatably connected to the fixed rotating shaft (11). An insulating rope (10) is fixedly connected to one end of the manual operating handle (8), and the insulating rope (10) passes through the insulating operating rod (1) and is connected to the movable clamping plate (3).

2. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: The insulating operating rod (1) is an internally hollow retractable rod, and the insulating operating rod (1) is made of glass fiber reinforced plastic epoxy resin.

3. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: The insulating rope (10) is made of either silk or glass fiber; The fixed splint (2) and the movable splint (3) are made of epoxy resin material.

4. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: A conductive fiber cloth retractable switching assembly (13) is provided on the clamping component (7), and the conductive fiber cloth retractable switching assembly (13) comprises an intermediate pressure roller (132), an unwinding electric roller (130), and a rewinding electric roller (131). The intermediate pressure roller (132) is mounted in the middle of the clamping component (7), and the unwinding electric roller (130) and the rewinding electric roller (131) are respectively mounted on detachable mounting covers (133) of the fixed clamping plate (2) and the movable clamping plate (3). The detachable mounting cover (133) is detachably connected to the fixed clamping plate (2) or the movable clamping plate (3). Roller covers (134) are fixedly connected to the detachable mounting covers (133) corresponding to the fixed clamping plate (2) and the movable clamping plate (3), and a scraper (135) is slidably connected to the inlet of the roller cover (134) corresponding to the movable clamping plate (3). The unwinding motorized roller (130) and the rewinding motorized roller (131) are connected via a cloth roll (136) formed by intermittently splicing a conductive fiber cloth (4) and a cleaning cloth; the cloth roll (136) is output from the unwinding motorized roller (130), passes over an intermediate pressure roller (132), and is finally wound around the rewinding motorized roller (131).

5. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: A clamping assembly (14) is provided on both the fixed clamping plate (2) and the movable clamping plate (3) of the clamping component (7); The clamping assembly (14) comprises a sliding guide platform (140), wherein the two sliding guide platforms (140) are respectively fixedly connected to the fixed clamping plate (2) and the movable clamping plate (3), a U-shaped clamping frame (141) is slidably connected to the sliding guide platform (140), the two U-shaped clamping frames (141) respectively penetrate the fixed clamping plate (2) and the movable clamping plate (3), the two ends of the U-shaped clamping frames (141) are respectively fixedly connected to a platform body (142), and the platform body (142) is fixedly connected to an electric Magnet 1 (143), an electromagnet 2 (144) is fixedly connected to the sliding guide platform (140), an electromagnet power supply is provided in the fixed clamping plate (2) and the movable clamping plate (3), and the electromagnet power supply is used to supply power to the electromagnet 1 (143) and the electromagnet 2 (144), and a clamping elastic member (145) is sleeved on the U-shaped clamping frame (141), and the clamping elastic member (145) is located between the electromagnet 1 (143) and the electromagnet 2 (144).

6. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: A micro camera is provided on the clamping component (7), and the micro camera is used to collect real-time test images. The micro camera is connected to a mobile terminal for communication. The mobile terminal establishes a three-dimensional image of the current stator hand package insulation end (12) based on the real-time test images. The mobile terminal simultaneously receives the detection results of the current and voltage meter (9), and corresponds each frame of the collected real-time test images to the detection value of the current and voltage meter, so as to quickly mark the abnormal position.

7. A stator end hand-wrapped insulation surface to ground potential test device according to claim 1, characterized in that: A mounting groove is provided in the middle of the working surface of the fixed clamping plate (2) and the movable clamping plate (3), and a T-shaped convex strip is provided on the contact surface between the supporting silica gel (5) and the fixed clamping plate (2) and the movable clamping plate (3), and the T-shaped convex strip is slidably connected in the mounting groove.

8. A method for testing the ground potential of the hand-wrapped insulation surface of a stator end, which is used to test the ground potential of the hand-wrapped insulation surface of a stator end according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Before the test begins, determine the length of the insulating operating rod (1) based on the voltage level of the generator under test and the position of the stator hand insulation to ensure a safe distance between the stator of the generator under test and the test personnel during the test; S2. Connect the ground wire of the current and voltage meter (9) to ensure that the ground wire of the current and voltage meter (9) is flexible and effectively connected without interfering with the test operation; S3. Use a DC high voltage generator to raise the stator voltage of the generator under test to the rated voltage; S4. The test personnel use the manual operating handle (8) of the stator end hand-wrapped insulation surface-to-ground potential test device to control the opening and closing of the clamping component (7), and clamp the clamping component (7) on one of the stator hand-wrapped insulation ends (12) in turn, measure its surface-to-ground voltage and leakage current, and repeat this process in turn until all stator hand-wrapped insulation ends (12) are tested; S5. After all tests are completed, adjust the voltage of the DC high-voltage generator, fully discharge the DC high-voltage generator and the generator stator, and return the stator end hand-wrapped insulation surface to ground potential test device to its original position.

Images