Core rod performance testing device

Abstract

The invention discloses a core rod performance testing device, belongs to the technical field of high-voltage insulation, solves the problem that the local electrical performance of a crisp and rotten core rod cannot be accurately measured, and mainly adopts the technical scheme that the core rod performance testing device comprises an insulating table, an insulating frame is fixed on the insulating table, and the insulating frame is fixed on the insulating table; the insulation frame comprises an insulation disc located above the insulation table, the insulation disc is connected with a high-voltage electrode extending towards the insulation table, a shielding piece is arranged on the upper surface of the insulation table, a core rod is placed on the shielding piece, the high-voltage electrode abuts against the upper surface of the core rod, and the high-voltage electrode is connected with the high-voltage electrode. A test electrode which penetrates through the insulation table and the shielding hole is connected below the insulation table, the end part of the test electrode abuts against the lower surface of the core rod, the test electrode and the high-voltage electrode are on the same axis, and the diameters of the test electrode and the high-voltage electrode are both smaller than the diameter of the core rod. The method is mainly used for solving the problem that the partial electrical performance of the crisp and rotten core rod cannot be accurately measured.

Description

Technical Field

[0001] The present application relates to the technical field of high voltage insulation, and in particular to a core rod performance testing device. Background Art

[0002] The problem of brittle deterioration of composite insulators has become a crucial research topic in the field of high voltage external insulation in recent years. In actual operation, the environment in which composite insulators are located is complex and changeable, and they are subjected to electrical stress, mechanical stress and various harsh environmental factors for a long time. Among them, the change in the electrical performance parameters of the brittle core rods of composite insulators is considered to be the direct cause of the abnormal heating of brittle and deteriorated composite insulators. In-depth understanding of the local electrical performance parameters and their differences in different areas of the brittle core rods is of irreplaceable importance for comprehensively obtaining the brittle deterioration characteristics of composite insulators and in-depth analysis of the fault development law.

[0003] On the one hand, since the degree of degradation of the brittle core rod in different areas often varies greatly, its local electrical parameters will show extremely complex changes in a smaller scale. For example, in the area near the end of the insulator, the change of electrical performance parameters may be more significant due to the interaction of electric field concentration and external environmental factors; while in the middle area of ​​the core rod, the degree of degradation is relatively light, and the change of electrical performance parameters is relatively gentle. This complex change makes it a very challenging task to accurately measure the local electrical performance parameters at different locations. First, the structure of the brittle core rod is relatively complex, which brings great difficulties to the selection of measuring equipment and the design of measurement methods. In addition, since the degradation of the brittle core rod is a gradual process, the changes in electrical performance parameters at different stages are also different, so it is necessary to establish a long-term monitoring mechanism in order to grasp the development trend of brittle degradation in a timely manner.

[0004] In summary, it is an important issue to be solved in the current research field of high voltage external insulation to accurately measure the local electrical performance parameters of different areas of the decayed core rod, comprehensively obtain the decay and degradation characteristics of the composite insulator and analyze its fault development law. It is of great significance to measure the electrical performance of different local areas on the core rod cross section at a small scale of mm, but there are few such test devices for testing in the current technology.

[0005] Application Contents In order to overcome the deficiency in the prior art that the local electrical properties of a brittle core rod cannot be accurately measured, the present application provides a core rod performance testing device, which can solve the problem that the local electrical properties of a brittle core rod cannot be accurately measured.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a core rod performance testing device, comprising an insulating table, an insulating frame fixed on the insulating table, the insulating frame comprising an insulating disk located above the insulating table, a high-voltage electrode extending toward the insulating table connected to the insulating disk, a shielding plate provided on the upper surface of the insulating table, a core rod placed on the shielding plate, the high-voltage electrode abuts against the upper surface of the core rod, a test electrode penetrating the insulating table and passing through the shielding hole is connected below the insulating table, an end of the test electrode abuts against the lower surface of the core rod, the test electrode and the high-voltage electrode are on the same axis and the diameters of both are smaller than the diameter of the core rod.

[0007] After adopting the above technical scheme, the present application has the following advantages: the high-voltage electrode and the test electrode are on the same axis, which can ensure the uniformity and symmetry of the electric field distribution in the core rod, which is very important for accurately measuring the electrical properties of the core rod, because the uniform electric field can reduce the measurement error caused by electric field distortion. The diameters of the high-voltage electrode and the test electrode are both smaller than the core rod diameter, so that the measured electric field is mainly concentrated in the local area of ​​the core rod, avoiding the influence of edge effects and external interference on the measurement results, and the provision of a shielding plate can effectively shield the interference of the external electromagnetic field, ensuring that the test results only reflect the electrical properties of the core rod itself, and are not affected by In order to avoid the influence of external interference, the design of the shielding hole enables the test electrode to pass through the shielding sheet and contact the core rod without destroying the overall shielding effect of the shielding sheet. On this basis, the DC volume resistivity and AC loss of the sample are tested to obtain the local electrical properties of the core rod. After a single test, the core rod is moved and tested radially or circumferentially to record the radial and circumferential changes of the local electrical properties of the core rod. The high-voltage electrode is connected to the insulating frame and the test electrode is connected under the insulating platform. This fixed connection method ensures that the electrode will not move or shake during the test, thereby increasing the accuracy of the test.

[0008] Furthermore, the test electrode is made of a hard material, and the test electrode is threadedly connected to the insulating platform.

[0009] With the above technical solution, the test electrode uses hard material to ensure contact stability: the test electrode made of hard material is not easy to deform when it contacts the lower surface of the core rod, which ensures that the electrode and the core rod always maintain stable contact during the test process, avoiding poor contact caused by electrode deformation, thereby improving the accuracy and reliability of the measurement. Even in long-term tests or repeated tests, the hard electrode can maintain its shape and position to ensure the consistency of each test; the test electrode is threadedly connected to the insulating table for easy installation and adjustment: the threaded connection method makes the installation and removal of the test electrode very convenient. The operator can easily screw the electrode in or out of the insulating table and quickly complete the assembly and adjustment of the test device. This connection method also allows the height of the electrode to be fine-tuned to ensure good contact between the electrode and the core rod. By rotating the electrode, the extension length of the electrode can be accurately controlled to meet the testing needs of core rods of different sizes.

[0010] Furthermore, the test electrode is made of hard material, a compression spring is provided near the end of the test electrode, the lower end of the compression spring abuts against the insulating platform, and the upper end of the compression spring is fixed to the test electrode, so that the test electrode extends upward from the shielding sheet.

[0011] The above technical solution ensures that the test electrode and the mandrel always have good contact, because the setting of the compression spring enables the test electrode to adapt to mandrels of different sizes and the unevenness of the mandrel surface. When the mandrel is placed on the test device, the compression spring automatically adjusts the position of the test electrode according to the actual situation of the mandrel, ensuring that the electrode and the mandrel always maintain appropriate contact pressure. This adaptive characteristic can effectively avoid poor contact caused by the wear and shortening of the test electrode due to long-term and multiple uses of the mandrel, thereby improving the accuracy and reliability of the test results.

[0012] Furthermore, the high-voltage electrode is made of a hard material, the high-voltage electrode is slidably connected to the insulating frame, a nut is connected to the high-voltage electrode above the insulating frame, and the nut abuts against the upper surface of the insulating frame.

[0013] The above-mentioned technical solution is adopted to fix the electrode position: the nut abuts against the upper surface of the insulating frame to fix the position of the high-voltage electrode. After the position of the high-voltage electrode is adjusted, the end of the high-voltage electrode can be firmly abutted against the core rod by tightening the nut to prevent the core rod from moving or shaking during the test, thereby ensuring the stability and reliability of the test. This fixing method is simple and effective, and can quickly lock the electrode position to avoid test errors caused by changes in the electrode position. The operator can adjust the tightening degree of the nut according to actual needs to achieve the purpose of fixing the electrode position and making fine adjustments when necessary. This adjustability makes the test device more flexible and can meet the needs under different test conditions. By reversely tightening the nut, the high-voltage electrode can be lifted, so that the operator can adjust the position of the core rod for the next step of testing.

[0014] Furthermore, the high-voltage electrode is made of soft material, and a counterweight block is provided near the end of the high-voltage electrode close to the insulating platform; or, the high-voltage electrode is made of soft material, and a counterweight shielding ring is fixedly provided near the end of the high-voltage electrode close to the insulating platform.

[0015] By adopting the aforementioned technical solution, the high-voltage electrode is made of soft material, so that during the test, the contact between the soft electrode and the core rod is relatively gentle, and it is not easy to cause mechanical damage such as scratches and wear to the surface of the core rod. This is very important for some situations that require repeated testing. It can extend the service life of the core rod and ensure the reliability of the test results. The counterweight block can provide a certain downward pressure for the high-voltage electrode to maintain a stable contact pressure between the electrode and the core rod. Even if there is a certain interference in the external environment (such as slight vibration), the counterweight block can ensure that the contact between the electrode and the core rod is not affected, thereby ensuring the smooth progress of the test.

[0016] Furthermore, a glass cover is provided around the outer side of the test frame, a glass door is rotatably connected to the glass cover, and a switch connected in series with the high-voltage electrode is connected to the glass door. When the glass door is opened, the switch is disconnected.

[0017] With the above technical solution, the glass cover and glass door provide a closed space for the entire test device, effectively preventing the operator from accidentally touching the high-voltage electrode and causing electric shock accidents. When the glass door is opened, the switch automatically disconnects the high-voltage electrode, further ensuring the safety of the operator. Even if unexpected situations occur during the test, such as equipment failure or misoperation, the glass cover can play a certain isolation role and reduce the risk of electric shock; the glass cover can also prevent external dust, debris and other factors that may affect the test from entering the test area. This helps to keep the test environment clean and stable, improve the accuracy and reliability of the test results, and at the same time, the glass cover can also reduce the interference of external electromagnetic fields on the test and ensure the authenticity of the test data.

[0018] Furthermore, a grounding rod is connected to the glass door. When the glass door is opened, the grounding rod is driven to drive the high-voltage electrode to separate from the core rod.

[0019] By adopting the above-mentioned technical solution, when the glass door is opened, not only the switch disconnects the high-voltage electrode, but the grounding rod is also driven and moves away from the high-voltage electrode, which provides double safety protection and further reduces the risk of electric shock for the operator. Even if the switch fails and fails to disconnect the high-voltage electrode in time, the action of the grounding rod can ensure that the high-voltage electrode is effectively isolated from the operator, making the testing of the core rod more convenient. After opening the glass door, the operator can move the position of the core rod for the next step of testing.

[0020] Furthermore, a grounding rod is rotatably connected to the insulating frame, and a movable side of the grounding rod can contact the high-voltage electrode.

[0021] By adopting the above-mentioned technical solution, the grounding rod is rotatably connected to the insulating frame, which is convenient and flexible to operate. The grounding rod can be rotated at any time according to actual needs for grounding operation without complicated tools or steps. This flexibility enables operators to quickly respond to various safety needs and improve work efficiency and safety.

[0022] Furthermore, a shielding ring is fixedly provided near the end of the high voltage electrode close to the insulating platform.

[0023] By adopting the above-mentioned technical solution, a shielding ring is set near the end of the high-voltage electrode near the insulating platform, which can effectively reduce the interference of the external electric field on the electric field between the high-voltage electrode and the core rod. In the actual test environment, there may be external electric fields from surrounding electrical equipment, transmission lines, etc., which will affect the accuracy of the test. The shielding ring can block the intrusion of external electric fields, making the electric field between the high-voltage electrode and the core rod more stable and uniform, thereby improving the measurement accuracy, especially when measuring the local electrical properties of the core rod, so as to reduce the interference such as local corona caused by the edge effect of the small diameter electrode, and ensure that the measurement results can better reflect the true performance of the core rod.

[0024] Furthermore, a two-dimensional grid is provided on the upper surface of the shielding sheet.

[0025] By adopting the above technical solution and utilizing the two-dimensional grid on the shielding sheet, the measurement position of the core rod can be accurately located and recorded, making it easier to restore the distribution of the local electrical parameters at each position obtained by measurement on the two-dimensional plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application is further described below in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of a mandrel performance testing device embodiment 1 of the present application; Figure 2This is a schematic diagram of a mandrel performance testing device embodiment 2 of the present application; Figure 3 A three-dimensional schematic diagram of a mandrel performance testing device.

[0027] Description of the drawings: 1. Insulating platform; 2. Insulating frame; 21. Grounding rod; 3. High-voltage electrode; 4. Test electrode; 5. Shielding sheet; 51. Shielding hole; 6. Core rod; 7. Compression spring; 8. Nut; 9. Counterweight; 91. Shielding ring; 10. Glass cover; 101. Glass door; 102. Grounding rod. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0029] The terms "first", "second", etc. (if any) in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish before a certain technical feature, it does not necessarily indicate that it has "first". It should be understood that in this application, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in this application, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0030] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] Embodiment 1: like Figure 1 and Figure 3As shown, the present application provides a core rod performance testing device, including an insulating platform 1, on which an insulating frame 2 is fixed, the insulating frame 2 includes an insulating disk located above the insulating platform, the insulating disk is connected to a high-voltage electrode 3 extending toward the insulating platform, the upper surface of the insulating platform 1 is provided with a shielding plate 5, a core rod 6 is placed on the shielding plate 5, the high-voltage electrode 3 abuts against the upper surface of the core rod 6, and a test electrode 4 is connected below the insulating platform 1, which passes through the insulating platform 1 and through the shielding hole 51, and the end of the test electrode 4 abuts against the lower surface of the core rod 6, the test electrode 4 and the high-voltage electrode 3 are on the same axis and the diameters of both are smaller than the diameter of the core rod 6.

[0032] After adopting the above technical scheme, the present application has the following advantages: the high-voltage electrode 3 and the test electrode 4 are on the same axis, which can ensure the uniformity and symmetry of the electric field distribution in the core rod 6, which is very important for accurately measuring the electrical properties of the core rod 6, because the uniform electric field can reduce the measurement error caused by the electric field distortion. The diameters of the high-voltage electrode 3 and the test electrode 4 are both smaller than the diameter of the core rod 6, so that the measured electric field is mainly concentrated in the local area of ​​the core rod 6, avoiding the influence of edge effect and external interference on the measurement results, and the shielding plate 5 can effectively shield the interference of the external electromagnetic field, ensuring that the test results only reflect the electrical properties of the core rod 6 itself, and are not affected by the outside world. In order to prevent the influence of interference, the design of the shielding hole 51 enables the test electrode 4 to pass through the shielding plate 5 and contact the core rod 6 without destroying the overall shielding effect of the shielding plate 5. On this basis, the DC body resistivity and AC loss of the sample are tested to obtain the local electrical properties of the core rod 6. After a single test, the core rod 6 is moved and tested radially or circumferentially to record the radial and circumferential changes in the local electrical properties of the core rod 6. The high-voltage electrode 3 is connected to the insulating frame 2, and the test electrode 4 is connected under the insulating platform 1. This fixed connection method can ensure that the electrode will not move or shake during the test, thereby increasing the accuracy of the test.

[0033] Specifically, the test electrode 4 will not contact the shielding hole 51 when passing through the shielding hole 51. The core rod 6 is a short sample of the brittle core rod 6. The cross-sectional area of ​​the high-voltage electrode 3 and the test electrode 4 is small, so that the electrical properties of different local areas on the cross section of the core rod 6 can be measured on a small scale of mm level.

[0034] Furthermore, the test electrode 4 is made of a hard material, and the test electrode 4 is threadedly connected to the insulating platform 1 .

[0035] With the above technical solution, the test electrode 4 is made of hard material to ensure contact stability: the test electrode 4 made of hard material is not easy to deform when it contacts the lower surface of the core rod 6, which ensures that the electrode and the core rod 6 always maintain stable contact during the test process, avoiding poor contact caused by electrode deformation, thereby improving the accuracy and reliability of the measurement. Even in long-term tests or repeated tests, the hard electrode can maintain its shape and position to ensure the consistency of each test; the test electrode 4 is threadedly connected to the insulating platform 1 for easy installation and adjustment: the threaded connection method makes the installation and disassembly of the test electrode 4 very convenient. The operator can easily screw the electrode in or out of the insulating platform 1, and quickly complete the assembly and adjustment of the test device. This connection method also allows the height of the electrode to be fine-tuned to ensure good contact between the electrode and the core rod 6. By rotating the electrode, the extension length of the electrode can be accurately controlled to meet the testing requirements of core rods 6 of different sizes.

[0036] Furthermore, the test electrode 4 is made of hard material, and a compression spring 7 is provided near the end of the test electrode 4. The lower end of the compression spring 7 abuts against the insulating platform 1, and the upper end of the compression spring 7 is fixed to the test electrode 4, so that the test electrode 4 extends upward from the shielding sheet 5.

[0037] By adopting the above technical solution, the test electrode 4 and the mandrel 6 are always in good contact, because the setting of the compression spring 7 enables the test electrode 4 to adapt to the mandrels 6 of different sizes and the unevenness of the surface of the mandrel 6. When the mandrel 6 is placed on the test device, the compression spring 7 will automatically adjust the position of the test electrode 4 according to the actual situation of the mandrel 6, ensuring that the electrode and the mandrel 6 always maintain appropriate contact pressure. This adaptive characteristic can effectively avoid the poor contact caused by the wear and shortening of the test electrode 4 due to the long-term and multiple use of the mandrel 6, thereby improving the accuracy and reliability of the test results.

[0038] Furthermore, the high-voltage electrode 3 is made of a hard material, and is slidably connected to the insulating frame 2 . A nut 8 is connected to the high-voltage electrode 3 above the insulating frame 2 , and the nut 8 abuts against the upper surface of the insulating frame 2 .

[0039] The above-mentioned technical solution is adopted to fix the electrode position: the nut 8 abuts against the upper surface of the insulating frame 2 to fix the position of the high-voltage electrode 3. After the position of the high-voltage electrode 3 is adjusted, the end of the high-voltage electrode 3 can be firmly abutted against the core rod 6 by tightening the nut 8 to prevent the core rod 6 from moving or shaking during the test, thereby ensuring the stability and reliability of the test. This fixing method is simple and effective, and can quickly lock the electrode position to avoid test errors caused by changes in the electrode position. The operator can adjust the tightening degree of the nut 8 according to actual needs to achieve the purpose of fixing the electrode position and making fine adjustments when necessary. This adjustability makes the test device more flexible and can meet the needs under different test conditions. By reversely tightening the nut 8, the high-voltage electrode 3 can be lifted, so that the operator can adjust the position of the core rod 6 to proceed to the next step of testing.

[0040] Furthermore, a glass cover 10 is provided around the outer side of the test frame, and a glass door 101 is rotatably connected to the glass cover 10. The glass door 101 is connected to a switch connected in series with the high-voltage electrode 3. When the glass door 101 is opened, the switch is disconnected.

[0041] By adopting the above-mentioned technical solution, the glass cover 10 and the glass door 101 provide a closed space for the entire test device, which effectively prevents the operator from accidentally touching the high-voltage electrode 3 and causing an electric shock accident. When the glass door 101 is opened, the switch automatically disconnects the high-voltage electrode 3, further ensuring the safety of the operator. Even if an unexpected situation occurs during the test, such as equipment failure or misoperation, the glass cover 10 can play a certain isolation role and reduce the risk of electric shock; the glass cover 10 can also prevent external dust, debris and other factors that may affect the test from entering the test area. This helps to keep the test environment clean and stable, improve the accuracy and reliability of the test results, and at the same time, the glass cover 10 can also reduce the interference of external electromagnetic fields on the test and ensure the authenticity of the test data.

[0042] Furthermore, a grounding rod 21 is rotatably connected to the insulating frame 2 , and a movable side of the grounding rod 21 can contact the high-voltage electrode 3 .

[0043] By adopting the above-mentioned technical solution, the grounding rod 21 is rotatably connected to the insulating frame 2, which is convenient and flexible to operate. The grounding rod 21 can be rotated at any time according to actual needs for grounding operations without the need for complicated tools or steps. This flexibility enables operators to quickly respond to various safety needs and improve work efficiency and safety.

[0044] Furthermore, a shielding ring 91 is fixedly provided near the end of the high voltage electrode 3 close to the insulating platform 1 .

[0045] By adopting the aforementioned technical solution, a shielding ring 91 is arranged near the end of the high-voltage electrode 3 near the insulating platform, which can effectively reduce the interference of the external electric field on the electric field between the high-voltage electrode 3 and the core rod 6. In the actual test environment, there may be external electric fields from surrounding electrical equipment, transmission lines, etc., which will affect the accuracy of the test. The shielding ring 91 can block the intrusion of external electric fields, making the electric field between the high-voltage electrode 3 and the core rod 6 more stable and uniform, thereby improving the measurement accuracy, especially when measuring the local electrical properties of the core rod 6, so as to reduce the interference such as local corona caused by the edge effect of the small diameter electrode, and ensure that the measurement results can better reflect the true performance of the core rod 6.

[0046] Specifically, two opposite sides of the shielding ring 91 are provided with through threaded holes, and the end of the high-voltage electrode 3 close to the insulating platform is also provided with the same through threaded hole. The shielding ring 91 and the high-voltage electrode 3 are connected by screws passing through the threaded holes.

[0047] Furthermore, a two-dimensional grid is provided on the upper surface of the shielding sheet 5 .

[0048] By adopting the above technical solution and utilizing the two-dimensional grid on the shielding sheet 5 , the measurement position of the core rod 6 can be accurately located and recorded, which facilitates the restoration of the distribution of the local electrical parameters at each position obtained by measurement on the two-dimensional plane.

[0049] Embodiment 2: The difference from Example 1 is that the high-voltage electrode 3 is made of soft material, and a counterweight block 9 is provided near the end of the high-voltage electrode 3 near the insulating platform; or, the high-voltage electrode 3 is made of soft material, and a counterweight shielding ring is fixedly provided near the end of the high-voltage electrode 3 near the insulating platform 1.

[0050] By adopting the aforementioned technical solution, the high-voltage electrode 3 is made of soft material, so that during the test, the contact between the soft electrode and the core rod 6 is relatively gentle, and it is not easy to cause mechanical damage such as scratches and wear to the surface of the core rod 6. This is very important for some situations that require repeated testing. It can extend the service life of the core rod 6 and ensure the reliability of the test results. The counterweight block 9 can provide a certain downward pressure for the high-voltage electrode 3 to maintain a stable contact pressure between the electrode and the core rod 6. Even if there is a certain interference in the external environment (such as slight vibration), the counterweight block 9 can ensure that the contact between the electrode and the core rod 6 is not affected, thereby ensuring the smooth progress of the test.

[0051] Specifically, the counterweight shielding ring has the effect of a shielding ring, and at the same time increases the weight so that it has the function of a counterweight block, which can press the end of the soft high-voltage electrode 3 onto the core rod 6.

[0052] Further, such as Figure 2As shown, a grounding rod 102 is connected to the glass door 101 . When the glass door 101 is opened, the grounding rod 102 is driven to drive the high-voltage electrode 3 to separate from the core rod 6 .

[0053] By adopting the above-mentioned technical solution, when the glass door 101 is opened, not only the switch disconnects the high-voltage electrode 3, but the grounding rod 102 is also driven and moves away from the high-voltage electrode 3, which provides double safety protection and further reduces the risk of electric shock for the operator. Even if the switch fails to disconnect the high-voltage electrode 3 in time, the action of the grounding rod 102 can ensure that the high-voltage electrode 3 is effectively isolated from the operator, making the testing of the core rod 6 more convenient. After opening the glass door 101, the operator can move the position of the core rod 6 for the next step of testing.

[0054] Specifically, the grounding rod 102 is in a hook shape. When the glass door 101 is opened, the grounding rod 102 hooks the soft high-voltage electrode 3 away from the core rod 6 .

[0055] The specific structure of the device is as follows: the insulating platform is a circular platform, which is connected to the lower part of the platform by four columns to lift the insulating platform above the ground. A through hole is set in the center of the insulating platform. A shielding plate with a shielding hole is placed at the center of the upper surface of the insulating platform. The shielding hole and the through hole are coaxial. The shielding plate is grounded. An insulating frame is installed above the insulating platform. The insulating frame includes an insulating disc and three supporting columns located below the insulating disc. A through hole is set in the center of the insulating disc. The through hole is coaxial with the through hole of the insulating platform. The core rod to be tested can be placed on the shielding plate. The high-voltage electrode The end passes through the through hole of the insulating disc and rests on the upper surface of the core rod. A threaded hole is provided near the end of the high-voltage electrode close to the insulating platform. The shielding ring is connected to the threaded hole through a screw to be fixed on the high-voltage electrode. The other end of the high-voltage electrode is connected to a DC regulated power supply. One end of the test electrode passes through the through hole and the shielding hole of the insulating platform, passes through the insulating platform and the shielding sheet, and rests on the lower surface of the core rod. The other end of the test electrode is connected to a picoammeter for monitoring the current. At this time, the high-voltage electrode and the test electrode are coaxial, and then the test can be started.

[0056] In addition to the above-mentioned preferred embodiments, the present application also has other implementation modes. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A mandrel performance testing device, characterized in that: It includes an insulating platform, on which an insulating frame is fixed, the insulating frame includes an insulating disk located above the insulating platform, the insulating disk is connected to a high-voltage electrode extending toward the insulating platform, the upper surface of the insulating platform is provided with a shielding sheet, the shielding sheet is provided with a shielding hole, a core rod is placed on the shielding sheet, the high-voltage electrode abuts against the upper surface of the core rod, a test electrode penetrating the insulating platform and passing through the shielding hole is connected below the insulating platform, the end of the test electrode abuts against the lower surface of the core rod, the test electrode and the high-voltage electrode are on the same axis and the diameters of both are smaller than the diameter of the core rod.

2. A mandrel performance testing device according to claim 1, characterized in that: The test electrode is made of hard material and is threadedly connected to the insulating platform.

3. A mandrel performance testing device according to claim 1, characterized in that: The test electrode is made of hard material, a compression spring is arranged near the end of the test electrode, the lower end of the compression spring abuts against the insulating platform, and the upper end of the compression spring is fixed to the test electrode, so that the test electrode extends upward from the shielding sheet.

4. A mandrel performance testing device according to claim 1, characterized in that: The high-voltage electrode is made of a hard material and is slidably connected to the insulating frame. A nut is connected to the high-voltage electrode above the insulating frame, and the nut abuts against the upper surface of the insulating frame.

5. A mandrel performance testing device according to claim 1, characterized in that: The high-voltage electrode is made of soft material, and a counterweight block is provided near the end of the high-voltage electrode; or, the high-voltage electrode is made of soft material, and a counterweight shielding ring is fixedly provided near the end of the high-voltage electrode.

6. A mandrel performance testing device according to claim 5, characterized in that: A glass cover is arranged around the outer side of the test frame, a glass door is rotatably connected to the glass cover, and a switch connected in series with the high-voltage electrode is connected to the glass door. When the glass door is opened, the switch is disconnected.

7. A mandrel performance testing device according to claim 6, characterized in that: The glass door is connected with a grounding rod. When the glass door is opened, the grounding rod is driven to drive the high-voltage electrode to separate from the core rod.

8. A mandrel performance testing device according to claim 1, characterized in that: A grounding rod is rotatably connected to the insulating frame, and a movable side of the grounding rod can contact the high-voltage electrode.

9. A mandrel performance testing device according to claim 1, characterized in that: A shielding ring is fixedly arranged near the end of the high voltage electrode close to the insulating platform.

10. The mandrel performance testing device according to claim 1, characterized in that: A two-dimensional grid is arranged on the upper surface of the shielding sheet.

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