Flat enameled wire high-voltage pinhole online detection device and detection method

Abstract

The invention relates to an online detection device and method for a high-voltage pinhole of a flat enameled wire. The device comprises an insulation detection box, the left and right ends of which are provided with openings and form a detection channel for a to-be-detected enameled wire to pass through; the pair of detection guide rollers are oppositely arranged on the insulation detection box and are used for being in contact with the wide surfaces of the upper side and the lower side of the to-be-detected enameled wire respectively; the elastic element provides force for the two detection guide rollers to be relatively close to each other and to be tightly attached to the wide surfaces of the upper and lower sides of the to-be-detected enameled wire; the wire supporting guide roller is used for guiding the to-be-detected enameled wire to pass through the detection channel; the detection bead curtains can be in contact with the narrow surfaces and the fillet surfaces on the left side and the right side of the to-be-detected enameled wire when the to-be-detected enameled wire passes; the control system comprises a high-voltage output module, a detection module and an alarm module, and the high-voltage output module is used for outputting the detection high voltage to the detection guide roller and the detection steel ball chain. According to the invention, the detection precision and reliability of pinhole and insulation damage defects are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of electrical performance testing technology for enameled wires, and in particular to an online high-voltage pinhole testing device and method for flat enameled wires. Background Technology

[0002] During the production of enameled conductors, the conductors are transported by multiple sets of guide rollers at high temperatures. This makes the enamel film surface susceptible to insulation defects such as pinholes and scratches due to mechanical friction or thermal stress, especially noticeable in the rounded transition areas of flat enameled wires. Existing testing devices often employ conductive brush testing methods. However, this method suffers from problems such as easy wear and deformation of the conductive brushes, and uneven contact on the testing surface. This results in insufficient testing coverage and an inability to effectively identify defects on the wide face and rounded corners of the conductor, easily leading to missed detections.

[0003] Therefore, there is an urgent need for an online inspection device that can continuously cover and accurately inspect the entire surface (including rounded edges) of flat enameled wires. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of insufficient detection accuracy and obvious blind spots in the existing technology of enameled wires, and to provide an online detection device and method for high voltage pinholes of flat enameled wires, so as to realize continuous, efficient and stable detection of the entire surface of the enameled wire, thereby significantly improving the detection accuracy and reliability of pinholes and insulation damage defects.

[0005] To solve the above-mentioned technical problems, the present invention provides an online detection device for high-voltage pinholes in flat enameled wires, comprising: An insulation testing box has openings at its left and right ends to form a testing channel for the enameled wire to be tested to pass through; wherein the enameled wire to be tested includes a wide surface on the top and bottom sides, a narrow surface on the left and right sides, and a rounded corner surface formed between the wide surface and the narrow surface. A pair of detection guide rollers, which are disposed in the insulation detection box and are arranged opposite to each other, are used to contact the wide surfaces of the upper and lower sides of the enameled wire to be tested, respectively. An elastic element is disposed between each of the detection guide rollers and the insulation detection box. The elastic element provides a force that brings the two detection guide rollers closer together and in close contact with the upper and lower wide surfaces of the enameled wire to be tested. At least one wire guide roller, disposed inside the insulation detection box and located on both sides of the pair of detection guide rollers, is used to guide the enameled wire to be tested through the detection channel. The detection bead curtain is suspended on the upper side wall inside the insulation detection box and hangs down naturally. The detection bead curtain can contact the narrow and rounded surfaces on its left and right sides when the enameled wire to be tested passes by. The control system includes a high-voltage output module, a detection module, and an alarm module. The high-voltage output module is used to output the detection high voltage to the detection guide roller and the detection steel ball chain, respectively. The detection guide roller and the detection bead curtain respectively contact the insulating varnish layer of the enameled wire to be tested, forming a capacitor; when the insulating varnish layer of the enameled wire to be tested is damaged, the current flowing through the detection guide roller and the detection bead curtain flows to the conductor inside the enameled wire to be tested, resulting in an instantaneous voltage / current change signal, which is detected by the detection module and triggers the alarm module to sound an alarm.

[0006] In one embodiment of the present invention, the detection bead curtain includes multiple rows of bead chains arranged closely along the length direction of the enameled wire to be tested. Each row of bead chains includes multiple closely arranged bead chains arranged along the width direction of the enameled wire to be tested and capable of covering the width dimension of the enameled wire to be tested. Each bead chain includes multiple beads connected by metal wires. The spacing between the beads in adjacent rows of bead chains is staggered.

[0007] In one embodiment of the present invention, the detection bead curtain includes four closely arranged bead chains, each bead chain consisting of beads with a diameter of 1.0 mm connected together by metal wire, wherein the distance between the metal beads in the first and third rows is 1.0 mm, and the distance between the beads in the second and fourth rows is 1.5 mm; the beads and the metal wire are both made of stainless steel.

[0008] In one embodiment of the present invention, the detection guide roller includes a fixed plate and a guide roller swing plate. The fixed plate is connected to the upper or lower side wall inside the insulation detection box. One end of the guide roller swing plate is connected to the detection guide roller, and the elastic element is disposed between the other end and the fixed plate.

[0009] In one embodiment of the present invention, the elastic element is a torsion spring; the insulation detection box is made of transparent insulating material.

[0010] In one embodiment of the present invention, two wire guide rollers are respectively disposed on the inlet and outlet sides of the detection channel, and a pressure guide roller is disposed on the opposite upper side of the wire guide rollers to form a guiding and limiting function, thereby suppressing the lateral swing of the enameled wire to be detected.

[0011] In one embodiment of the present invention, the front and bottom surfaces of the insulation detection box are connected by a hinge to form an openable door. The edge of the door is provided with a magnetic attraction structure and a contact switch. The contact switch is electrically connected to the control system to cut off the output of the detection high voltage when the door is opened.

[0012] In one embodiment of the present invention, the high-voltage output module includes a power supply module, a voltage control module, a spark maker READY module, a high-voltage transformer module, a sinusoidal oscillation module, and a high-pass filter module; The power module is used to receive AC power input and provide a stable operating voltage after rectification and voltage regulation. The voltage control module is connected to the power supply module and is used to maintain a stable operating voltage. The sinusoidal oscillation module is connected to the high-voltage transformer module and is used to generate a sinusoidal oscillation signal; The high-voltage transformer module is connected to the sinusoidal oscillation module, which increases the test voltage to 0-15KVAC; the output end of the high-voltage transformer module is connected to the detection guide roller and the detection bead curtain. The high-pass filter module is connected to the high-voltage transformer module and is used to detect the feedback signal of the high-voltage transformer module; The EDM READY module is electrically connected to the power module, the voltage control module and the contact switch respectively, so as to turn on or off the output test high voltage; The detection module is connected to the high-pass filter module and is used to determine the magnitude of the high-pass filtered signal in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire to be detected, and output a signal to the alarm module to trigger an audible and visual alarm.

[0013] In one embodiment of the present invention, the alarm module includes a warning light and / or a buzzer disposed on the outer wall of the insulation detection box.

[0014] This invention also provides an online detection method for high-voltage pinholes in flat enameled wires, utilizing the aforementioned online detection device for high-voltage pinholes in flat enameled wires. The detection method includes: Under the guidance and limiting action of the wire guide roller and the wire pressing roller, the enameled wire to be tested is stably passed through the detection channel. A pair of detection guide rollers respectively contact the wide surfaces of the upper and lower sides of the enameled wire to be tested. The detection bead curtain hangs down naturally and contacts the narrow surfaces and rounded corner surfaces of the left and right sides of the enameled wire to be tested. The contact switch status of the door of the insulation detection box is detected. If the door of the insulation detection box is in the open state, the high voltage output is cut off by the control system; when the contact switch confirms that the door is closed, the high voltage output is allowed to enter. The power supply module rectifies and regulates the input AC power to provide a stable operating voltage; the voltage control module maintains the stability of the operating voltage. The sinusoidal oscillation signal output by the sinusoidal oscillation module is sent to the high voltage transformer module to be boosted to a detection high voltage of 0-15KVAC, and then applied to the detection guide roller and the detection bead curtain through the high voltage output terminal respectively, so as to form a high voltage detection electric field acting on the enameled wire to be tested in the detection channel. The high-pass filter module detects the feedback signal from the high-voltage transformer module. The detection module is used to determine the magnitude of the signal after high-pass filtering in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire to be tested, and outputs a signal to the alarm module to trigger an audible and visual alarm.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses an online detection device and method for high-voltage pinholes in flat enameled conductors. By installing a pair of vertically arranged detection guide rollers and a suspended detection bead curtain within an insulation detection box, the conductive detection elements cover and contact the top and bottom wide surfaces, left and right narrow surfaces, and transition rounded corner surfaces of the flat enameled conductor, thereby achieving real-time detection of the electrical insulation status of the entire surface of the enameled conductor. Compared to traditional conductive brush detection methods, this effectively eliminates detection blind spots in the rounded corner areas, ensuring that defects such as pinholes, scratches, and enamel film damage can be identified promptly, improving the completeness and reliability of the detection.

[0016] This invention employs the principle of high-voltage AC detection, forming a stable high-voltage electric field between the detection guide roller and the detection bead curtain. When a minor damage or pinhole occurs in the insulation layer of the enameled wire, a voltage and current change signal will be instantaneously generated under the high-voltage electric field, achieving highly sensitive and fast-response online detection. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the main structure of the online detection device for high-voltage pinholes in flat enameled wires according to the present invention.

[0019] Figure 2 This is a schematic diagram of the left-side structure of the online detection device for high-voltage pinholes in flat enameled wires according to the present invention.

[0020] Figure 3 This is a right-side structural schematic diagram of the online detection device for high-voltage pinholes in flat enameled wires according to the present invention.

[0021] Figure 4 This is a schematic diagram of the control system of the online detection device for high-voltage pinholes in flat enameled wires according to the present invention.

[0022] Explanation of reference numerals on the accompanying drawings: 1. Insulation testing box; 2. Inspection guide roller; 21. Elastic element; 22. Fixing plate; 23. Guide roller swing plate; 3. Line guide rollers; 4. Inspecting beaded curtains; 41. Beaded chain; 42. Chain beads; 43. Metal wire; 5. Control system; 51. Power supply module; 52. Voltage control module; 53. EDM READY module; 54. High voltage transformer module; 55. Sine wave oscillation module; 56. High-pass filter module; 57. Detection module; 58. Alarm module; 6. Enamelled wire to be tested; 7. Pressure line guide roller. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0024] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0027] Reference Figures 1 to 3 As shown, the present invention provides an online detection device for high-voltage pinholes in flat enameled wires, comprising: The insulation testing box 1 has openings at its left and right ends to form a testing channel for the enameled wire 6 to be tested to pass through; wherein the enameled wire 6 to be tested includes a wide surface on the upper and lower sides, a narrow surface on the left and right sides, and a rounded corner surface formed between the wide surface and the narrow surface. A pair of detection guide rollers 2, which are disposed in the insulation detection box 1 and are arranged opposite to each other, are used to contact the wide surfaces of the upper and lower sides of the enameled wire 6 to be tested, respectively. An elastic element 21 is disposed between each of the detection guide rollers 2 and the insulation detection box 1. The elastic element 21 provides a force that brings the two detection guide rollers 2 closer together and in close contact with the wide surfaces of the upper and lower sides of the enameled wire 6 to be tested. At least one wire guide roller 3, which is disposed inside the insulation detection box 1 and located on both sides of the pair of detection guide rollers 2, is used to guide the enameled wire 6 to be tested through the detection channel. The detection bead curtain 4 is suspended on the upper side wall inside the insulation detection box 1 and hangs down naturally. The detection bead curtain 4 can contact the narrow and rounded surfaces on its left and right sides when the enameled wire 6 to be tested passes by. The control system 5 includes a high-voltage output module, a detection module 57, and an alarm module 58. The high-voltage output module is used to output the detection high voltage to the detection guide roller 2 and the detection steel ball chain, respectively. The detection guide roller 2 and the detection bead curtain 4 respectively contact the insulating varnish layer of the enameled wire 6 to be tested, forming a capacitor; when the insulating varnish layer of the enameled wire 6 to be tested is damaged, the current flowing through the detection guide roller 2 and the detection bead curtain 4 flows to the conductor inside the enameled wire 6 to be tested, resulting in an instantaneous voltage / current change signal, which is detected by the detection module 57 and triggers the alarm of the alarm module 58.

[0028] In one embodiment, the detection beaded curtain 4 includes multiple rows of beaded chains 41 arranged closely along the length of the enameled wire 6 to be tested. Each row of beaded chains 41 includes multiple closely arranged beaded chains arranged along the width of the enameled wire 6 to be tested and capable of covering the width dimension of the enameled wire 6 to be tested. Each beaded chain includes multiple chain beads 42 connected in series by metal wires 43. The chain beads 42 of adjacent rows of beaded chains 41 are arranged with staggered spacing.

[0029] In one embodiment, the detection beaded curtain 4 includes four closely arranged beaded chains 41, each beaded chain 41 being composed of chain beads 42 with a diameter of 1.0 mm strung together by metal wires 43. The distance between the metal beads in the first and third rows is 1.0 mm, and the distance between the chain beads 42 in the second and fourth rows is 1.5 mm. The chain beads 42 and the metal wires 43 are both made of stainless steel.

[0030] The detection bead curtain 4 employs a multi-row, staggered metal bead chain structure, ensuring high-density, multi-point contact with the sides and rounded corners of the conductor. This allows for varying contact depths and coverage angles, further enhancing the uniformity and sensitivity of the detection electric field. This structure not only adapts to flat enameled wires of different sizes and specifications but also exhibits excellent adaptability and durability.

[0031] In one embodiment, the detection guide roller 2 includes a fixed plate 22 and a guide roller swing plate 23. The fixed plate 22 is connected to the upper or lower side wall inside the insulation detection box 1. One end of the guide roller swing plate 23 is connected to the detection guide roller 2, and the elastic element 21 is disposed between the other end and the fixed plate 22.

[0032] In one embodiment, the elastic element 21 is a torsion spring; the insulation detection box 1 is made of transparent insulating material, allowing for direct observation of the conductor's operating status.

[0033] The insulation testing box 1 is internally equipped with a wire-supporting guide roller 3 and a wire-pressing guide roller 7, which together form a guiding and limiting mechanism to maintain constant tension and straight passage of the flat enameled wire in the testing channel. The upper and lower testing guide rollers 2 provide constant contact pressure through torsion springs, which can automatically compensate for wire thickness tolerances and minor oscillations, avoid fluctuations in the testing signal caused by wire vibration, and ensure testing accuracy and data stability.

[0034] In one embodiment, two wire guide rollers 3 are respectively disposed on the inlet and outlet sides of the detection channel, and a wire pressing roller 7 is disposed on the opposite upper side of the wire guide rollers 3 to form a guiding and limiting function, thereby suppressing the lateral swing of the enameled wire 6 to be detected.

[0035] In one embodiment, the front and bottom surfaces of the insulation detection box 1 are connected by a hinge to form an openable door. The door edge is equipped with a magnetic attraction structure and a contact switch. The contact switch is electrically connected to the control system 5 to cut off the output of the high-voltage detection when the door is opened. This structure not only improves the safety performance of the equipment but also facilitates daily cleaning and maintenance.

[0036] In one embodiment, refer to Figure 4 As shown, the high-voltage output module includes a power supply module 51, a voltage control module 52, a spark maker READY module 53, a high-voltage transformer module 54, a sinusoidal oscillation module 55, and a high-pass filter module 56. The power module 51 is used to receive AC power input and provide a stable operating voltage after rectification and voltage regulation. The voltage control module 52 is connected to the power supply module 51 and is used to maintain the stability of the operating voltage; The sinusoidal oscillation module 55 is connected to the high-voltage transformer module 54 and is used to generate a sinusoidal oscillation signal. The high-voltage transformer module 54 is connected to the sinusoidal oscillation module 55 to increase the test voltage to 0-15KVAC; the output terminal of the high-voltage transformer module 54 is connected to the detection guide roller 2 and the detection bead curtain 4. The high-pass filter module 56 is connected to the high-voltage transformer module 54 and is used to detect the feedback signal of the high-voltage transformer module 54. The EDM READY module 53 is electrically connected to the power module 51, the voltage control module 52, and the contact switch to turn the output test high voltage on or off. In addition, the EDM READY module 53 includes a working mode setting button and a high voltage test safety switch button. The working mode includes automatic or manual mode. When the high voltage test safety switch is turned on, the output test high voltage is turned off. Settings such as the switch, reset signal, and manual or automatic settings can be adjusted through the EDM READY module 53. The detection module 57 is connected to the high-pass filter module 56 and is used to determine the magnitude of the high-pass filtered signal in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire 6 to be detected, and output a signal to the alarm module 58 to trigger an audible and visual alarm.

[0037] It should be noted that the power supply module 51 uses an existing switching power supply; the voltage control module 52 uses a PID voltage control circuit, the display circuit uses an ICL7107 as an A / D converter and an HDSP-5501 as a digital tube driver chip; the high-voltage transformer module 54 uses a high-voltage transformer; the sinusoidal oscillation module 55 uses a 3KHz sinusoidal oscillation circuit, which, together with the high-voltage transformer, forms an oscillation loop to output the oscillation signal to the high-voltage transformer and retrieve the feedback signal from the high-voltage transformer.

[0038] In one embodiment, the alarm module 58 includes a warning light and / or a buzzer disposed on the outer wall of the insulation detection box 1.

[0039] This embodiment also provides an online detection method for high-voltage pinholes in flat enameled wires, utilizing the aforementioned online detection device for high-voltage pinholes in flat enameled wires. The detection method includes: S1. Under the guidance and limiting action of the wire guide roller 3 and the wire pressing guide roller 7, the enameled wire 6 to be tested is stably passed through the detection channel. A pair of detection guide rollers 2 respectively contact the wide surfaces of the upper and lower sides of the enameled wire 6 to be tested. The detection bead curtain 4 hangs down naturally and contacts the narrow surfaces and rounded corner surfaces of the left and right sides of the enameled wire 6 to be tested. S2. Detect the contact switch status of the door of the insulation detection box 1. If the door of the insulation detection box 1 is in the open state, the control system 5 cuts off the high voltage output; when the contact switch confirms that the door is closed, the high voltage output is allowed to enter. S3, the power supply module 51 rectifies and regulates the input AC power to provide a stable operating voltage; the voltage control module 52 maintains the stability of the operating voltage; S4. The sinusoidal oscillation signal output by the sinusoidal oscillation module 55 is sent to the high voltage transformer module 54 to be boosted to a detection high voltage of 0-15KVAC, and applied to the detection guide roller 2 and the detection bead curtain 4 through the high voltage output terminal respectively, so as to form a high voltage detection electric field acting on the enameled wire 6 to be tested in the detection channel. S5. The high-pass filter module 56 detects the feedback signal of the high-voltage transformer module 54. The detection module 57 is used to determine the magnitude of the signal after high-pass filtering in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire 6 to be tested, and outputs a signal to the alarm module 58 to trigger an audible and visual alarm.

[0040] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An online detection device for high-voltage pinholes in flat enameled wires, characterized in that, include: An insulation testing box (1) has openings at its left and right ends to form a testing channel for the enameled wire (6) to be tested to pass through; wherein the enameled wire (6) to be tested includes a wide surface on the upper and lower sides, a narrow surface on the left and right sides, and a rounded corner surface formed between the wide surface and the narrow surface. A pair of test guide rollers (2) are arranged opposite to each other in the insulation test box (1) for contacting the wide surfaces of the upper and lower sides of the enameled wire (6) to be tested respectively; An elastic element (21) is disposed between each of the detection guide rollers (2) and the insulation detection box (1). The elastic element (21) provides force to bring the two detection guide rollers (2) closer to each other and to press against the wide surfaces of the upper and lower sides of the enameled wire (6) to be tested. At least one wire guide roller (3) is disposed inside the insulation testing box (1) and located on both sides of the pair of testing guide rollers (2) to guide the enameled wire (6) to be tested through the testing channel. The detection bead curtain (4) is suspended on the upper side wall inside the insulation detection box (1) and hangs down naturally. The detection bead curtain (4) can contact the narrow and rounded surfaces on its left and right sides when the enameled wire (6) to be tested passes by. The control system (5) includes a high-voltage output module, a detection module (57), and an alarm module (58). The high-voltage output module is used to output the detection high voltage to the detection guide roller (2) and the detection steel ball chain respectively. The detection guide roller (2) and the detection bead curtain (4) respectively contact the insulating varnish layer of the enameled wire (6) to be tested, forming a capacitor; when the insulating varnish layer of the enameled wire (6) to be tested is damaged, the current flowing through the detection guide roller (2) and the detection bead curtain (4) flows to the conductor inside the enameled wire (6) to be tested, and an instantaneous voltage / current change signal appears, which is detected by the detection module (57) and triggers the alarm module (58).

2. The online detection device for high-voltage pinholes in flat enameled wires according to claim 1, characterized in that, The detection bead curtain (4) includes multiple rows of bead chains (41) arranged closely along the length of the enameled wire (6) to be tested. Each row of bead chains (41) includes multiple closely arranged bead chains arranged along the width of the enameled wire (6) to be tested and capable of covering the width of the enameled wire (6) to be tested. Each bead chain includes multiple beads (42) connected by metal wires (43). The beads (42) of adjacent rows of bead chains (41) are arranged with staggered spacing.

3. The online detection device for high-voltage pinholes in flat enameled wires according to claim 2, characterized in that, The detection bead curtain (4) includes four rows of closely arranged bead chains (41), each bead chain (41) is made of chain beads (42) with a diameter of 1.0 mm connected by metal wire (43), wherein the distance between the metal beads in the first row and the third row is 1.0 mm, and the distance between the chain beads (42) in the second row and the fourth row is 1.5 mm; the chain beads (42) and the metal wire (43) are both made of stainless steel.

4. The online detection device for high-voltage pinholes in flat enameled wires according to claim 1, characterized in that, The detection guide roller (2) includes a fixed plate (22) and a guide roller swing plate (23). The fixed plate (22) is connected to the upper or lower side wall inside the insulation detection box (1). One end of the guide roller swing plate (23) is connected to the detection guide roller (2), and the other end is provided with the elastic element (21) between it and the fixed plate (22).

5. The online detection device for high-voltage pinholes in flat enameled wires according to claim 1, characterized in that, The elastic element (21) is a torsion spring; the insulation detection box (1) is made of transparent insulating material.

6. The online detection device for high-voltage pinholes in flat enameled wires according to claim 1, characterized in that, Two wire guide rollers (3) are respectively arranged on the inlet and outlet sides of the detection channel. A wire pressure guide roller (7) is arranged on the upper side of the wire guide roller (3) to form a guiding and limiting function, and suppress the lateral swing of the enameled wire (6) to be detected.

7. The online detection device for high-voltage pinholes in flat enameled wires according to claim 1, characterized in that, The front and bottom surfaces of the insulation detection box (1) are connected by a hinge to form an openable door. The edge of the door is provided with a magnetic attraction structure and a contact switch. The contact switch is electrically connected to the control system (5) to cut off the output of the detection high voltage when the door is opened.

8. The online detection device for high-voltage pinholes in flat enameled wires according to claim 7, characterized in that, The high-voltage output module includes a power supply module (51), a voltage control module (52), a spark maker READY module (53), a high-voltage transformer module (54), a sine oscillation module (55), and a high-pass filter module (56). The power module (51) is used to receive AC input and provide a stable operating voltage after rectification and voltage regulation; The voltage control module (52) is connected to the power supply module (51) and is used to maintain the stability of the operating voltage; The sinusoidal oscillation module (55) is connected to the high-voltage transformer module (54) and is used to generate a sinusoidal oscillation signal; The high voltage transformer module (54) is connected to the sinusoidal oscillation module (55) to increase the test voltage to 0-15KVAC; the output end of the high voltage transformer module (54) is connected to the detection guide roller (2) and the detection bead curtain (4). The high-pass filter module (56) is connected to the high-voltage transformer module (54) and is used to detect the feedback signal of the high-voltage transformer module (54); The EDM READY module (53) is electrically connected to the power module (51), the voltage control module (52) and the contact switch respectively to turn on or off the output test high voltage; The detection module (57) is connected to the high-pass filter module (56) and is used to determine the magnitude of the signal after high-pass filtering in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire (6) to be tested, and output a signal to the alarm module (58) to trigger an audible and visual alarm.

9. A method for online detection of high-voltage pinholes in flat enameled wires, characterized in that, The alarm module (58) includes a warning light and / or a buzzer disposed on the outer wall of the insulation detection box (1).

10. A method for online detection of high-voltage pinholes in flat enameled wires, characterized in that, The online detection device for high-voltage pinholes in flat enameled wires according to any one of claims 1-9, wherein the detection method includes: Under the guidance and limiting action of the wire guide roller (3) and the wire pressing guide roller (7), the enameled wire (6) to be tested is stably passed through the detection channel. A pair of detection guide rollers (2) respectively contact the wide surfaces of the upper and lower sides of the enameled wire (6) to be tested. The detection bead curtain (4) hangs down naturally and contacts the narrow surfaces and rounded corner surfaces of the left and right sides of the enameled wire (6) to be tested. The contact switch status of the door of the insulation detection box (1) is detected. If the door of the insulation detection box (1) is in the open state, the high voltage output is cut off by the control system (5). When the contact switch confirms that the door is closed, the high voltage output is allowed to enter. The power supply module (51) rectifies and regulates the input AC power to provide a stable operating voltage; the voltage control module (52) maintains the stability of the operating voltage. The sinusoidal oscillation signal output by the sinusoidal oscillation module (55) is sent to the high voltage transformer module (54) to be boosted to a detection high voltage of 0-15KVAC, and applied to the detection guide roller (2) and the detection bead curtain (4) respectively through the high voltage output terminal, so as to form a high voltage detection electric field acting on the enameled wire (6) to be detected in the detection channel; The high-pass filter module (56) detects the feedback signal of the high-voltage transformer module (54), and the detection module (57) is used to determine the magnitude of the signal after high-pass filtering in order to identify the instantaneous voltage / current changes caused by pinholes, damage or breakdown of the insulation layer of the enameled wire (6) to be tested, and outputs a signal to the alarm module (58) to trigger an audible and visual alarm.

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