A test device for studying gas insulation and breaking characteristics

Abstract

The present invention relates to the field of switchgear test devices, and in particular to a test device for studying gas insulation characteristics and breaking characteristics. The device includes a housing and a moving end support and a static end support. The moving end support is provided with a moving end support, and the moving end support is provided with a moving end mounting structure for mounting a moving contact or a moving end test electrode. The static end support has a static end mounting structure for mounting a static end support or a static end electrode seat. The present invention provides a moving end mounting structure on the moving end support to facilitate the installation of the moving contact or the moving end test electrode, and the static end support has a static end mounting structure to facilitate the installation of the static end support or the static end electrode seat. When switching between gas insulation characteristics research and gas breaking characteristics research, the moving end support, the static end support and the driving mechanism are retained, and the remaining components can be replaced accordingly, thereby solving the problem in the prior art that different test devices are required to study the insulation characteristics and breaking characteristics of gas, resulting in high costs.

Description

Technical Field

[0001] The present invention relates to the field of switchgear test devices, in particular to a test device for studying gas insulation characteristics and breaking characteristics. Background Art

[0002] Sulfur hexafluoride (SF6) is a highly electronegative gas. Its molecules readily adsorb free electrons to form massive negative ions, weakening the impact ionization process in the gas. This results in high electrical insulation strength, leading to its extensive use in high-voltage switchgear already in operation. However, SF6 is also a gas with a significant greenhouse effect. With increasing attention being paid to greenhouse gas emission reduction efforts both domestically and internationally, the search for an environmentally friendly insulating gas alternative to SF6 is urgent, thus necessitating research into alternatives.

[0003] Currently required tests primarily focus on insulation and interruption characteristics. Gas insulation characteristics refer to the inherent properties of a gas, while gas interruption characteristics refer to the actual performance of the gas during product operation. These two properties are crucial for the application of insulating gases in high-voltage products. The gas insulation test involves setting electrodes in a sealed chamber and measuring the breakdown voltage at a constant distance between them. The gas interruption test simulates the movement of the product to test the gas's insulation performance.

[0004] However, the test devices in the existing technology have a single function, and one device can only study one characteristic. If the insulation characteristics and breaking characteristics of the same gas need to be studied simultaneously, it is necessary to use two test devices to carry out the studies, which will increase the time cost and equipment cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a test device for studying the insulation and breaking characteristics of gases, so as to solve the problem in the prior art that different test devices are required to study the insulation and breaking characteristics of gases, resulting in high costs.

[0006] To achieve the above objectives, a test device for studying gas insulation and breaking characteristics in the present invention adopts the following technical solutions:

[0007] A test device for studying gas insulation characteristics and breaking characteristics, comprising a shell and a moving end support and a static end support respectively installed at the axial ends of the shell, the moving end support being installed with a moving end support, the moving end support being provided with a moving end mounting structure for mounting a moving contact or a moving end test electrode, the shell being provided with a driving mechanism for driving the moving contact or the moving end test electrode to move directly, the static end support having a static end mounting structure for mounting a static end support or a static end electrode seat; during the test, by installing the moving contact on the moving end mounting structure, installing the static end support on the static end mounting structure and arranging the static contact on the static end support, the moving contact and the static contact are coordinated to carry out a gas breaking characteristic study; by installing the moving end test electrode on the moving end mounting structure, installing the static end electrode seat on the static end mounting structure and arranging the static end test electrode on the static end electrode seat, the moving end test electrode and the static end test electrode are coordinated to carry out a gas insulation characteristic study, and when switching between the gas insulation characteristic study and the gas breaking characteristic study, the corresponding components can be replaced.

[0008] The beneficial effects of the above technical solution are as follows: the present invention pioneers a test device for studying gas insulation and breaking characteristics. By installing a moving end support and a static end support in the axial direction of the housing, the moving end and static end components are conveniently installed, thereby facilitating testing. A moving end support is provided on the moving end, and a moving end mounting structure is provided on the moving end support to facilitate the installation of a moving contact or a moving end test electrode. In addition, a driving mechanism is provided to facilitate the control of the movement of the moving contact or the moving end test electrode. The static end support has a static end mounting structure to facilitate the installation of a static end support or a static end electrode holder. When studying the gas breaking characteristics, the moving contact is correspondingly installed on the moving end mounting structure and the static contact is installed on the static end support. At this time, driven by the driving structure, the movement of opening and closing can be simulated, thereby facilitating the study of the gas breaking characteristics. When studying the gas insulation characteristics, the moving end test electrode is correspondingly installed on the moving end mounting structure, the static end electrode holder is installed on the static end mounting structure, and the static end test electrode is provided on the static end electrode holder. The gas insulation characteristics are studied by changing the voltage and the distance between the electrodes. When switching between the study of gas insulation characteristics and the study of gas breaking characteristics, the dynamic end support, static end support and drive mechanism are retained, and the remaining components can be replaced accordingly, thereby solving the problem in the prior art that different test devices are required to study the insulation characteristics and breaking characteristics of gas, resulting in high costs.

[0009] Furthermore, the moving end support is a moving end insulator, and the moving end support is installed on the central insert of the moving end insulator. The driving mechanism includes a driving rod extending into the shell, and a gear is provided on the driving rod to drive the moving contact or the moving end test electrode to move directly through the gear rack structure. The driving mechanism also includes a rotating device for driving the driving rod to rotate.

[0010] The beneficial effects of the above technical solution are: by setting the moving end insulator as the moving end support, the arrangement of the moving end support is facilitated, and current can be conducted through the insulator; the driving mechanism extends into the interior of the shell to facilitate driving the moving end, and the form of the gear facilitates the conversion of the rotational motion of the rotating device into a linear drive, which is convenient for testing.

[0011] Furthermore, the rotating device includes an operating mechanism connected to the drive rod when conducting a gas breaking characteristic study, and the rotating device also includes an operating handle connected to the drive rod when conducting a gas insulation characteristic study.

[0012] The beneficial effect of the above technical solution is that: when studying the gas breaking characteristics, rapid movement is required, while when studying the gas insulation characteristics, the movement stroke needs to be relatively precise. Therefore, an operating mechanism is set to enable rapid movement, and an operating handle is set to perform precise stroke control.

[0013] Furthermore, the test device for studying gas insulation characteristics and breaking characteristics also includes a dial fixedly arranged on the outside of the shell for conducting gas insulation characteristics research, and a pointer that cooperates with the dial is fixed on the operating handle.

[0014] The beneficial effect of the above technical solution is that the travel of the operating handle can be accurately read through the cooperation of the dial and the pointer, and the control is more precise.

[0015] Furthermore, the test device for studying gas insulation characteristics and breaking characteristics also includes a shielding support that is detachably connected to the moving end support, and a moving end shielding cover is installed on the shielding support. The test device also includes a static end shielding cover installed on the static end support. The static end shielding cover and the moving end shielding cover are used to shield the corresponding contacts when conducting gas breaking characteristics research.

[0016] The beneficial effect of the above technical solution is that the surrounding components during the test are shielded by providing the dynamic end shielding cover and the static end shielding cover, thereby improving safety performance and further simulating the working performance of the actual product.

[0017] Furthermore, a gasket is sandwiched between the shielding support and the moving end support, so that the distance between the moving end shielding cover and the static end shielding cover can be changed by changing the number and / or thickness of the gasket.

[0018] The beneficial effect of the above technical solution is that the distance between the moving end shielding cover and the static end shielding cover can be easily adjusted, and the influence of different distances between the moving end shielding cover and the static end shielding cover on the breaking process can be easily understood.

[0019] Furthermore, the moving end shielding cover is fixedly connected to the shielding support by means of bolts, and the static end shielding cover is fixedly connected to the static end support by means of bolts.

[0020] The beneficial effect of the above technical solution is that the shielding cover is fixed by bolts, which makes it easy to disassemble and replace.

[0021] Furthermore, the moving end test electrode includes a moving rod and an electrode body mounted on the moving rod. The electrode body can be detachably mounted on the moving rod and / or the static end test electrode can be detachably mounted on the static end electrode holder to replace different types of electrode bodies and / or static end test electrodes.

[0022] The beneficial effect of the above technical solution is that it is easy to replace different electrodes, thereby simulating the insulation performance of gas under different electric fields, and making the test more diversified.

[0023] Furthermore, the driving mechanism also includes a fixed seat fixedly arranged on the outer side wall of the shell, and the driving rod includes an insulating rod extending into the shell and a metal rod rotatably installed in the fixed seat. The insulating rod and the metal rod are transmission connected, and the metal rod is transmission connected to the rotating device.

[0024] The beneficial effects of the above technical solution are: facilitating the sealing of the driving mechanism at the point where the shell is penetrated, providing an insulating rod to prevent the driving mechanism from being electrified, and providing a metal rod to facilitate power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a test device for studying gas insulation and breaking characteristics in the present invention;

[0026] Figure 2 Schematic diagram of a test device for studying gas insulation characteristics and breaking characteristics in the present invention;

[0027] Figure 3 for Figure 1 A schematic diagram of replacing the shielding cover in the illustrated embodiment;

[0028] Figure 4 for Figure 1 A partial enlarged view of the embodiment shown.

[0029] In the figure: 1. Shell; 21. Moving end insulator; 22. Static end insulator; 31. Moving end support; 32. Moving contact; 33. Gasket; 34. Shielding support; 35. Moving end shielding cover; 351. First moving end shielding cover; 352. Second moving end shielding cover; 353. Third moving end shielding cover; 36. Electrode body; 37. Moving rod; 38. Protective cover; 41. Static end support; 42. Static contact; 43. Static end shielding cover; 44. Static end electrode holder; 45. Static end test electrode; 51. Metal rod; 52. Insulating rod; 53. Gear shaft; 54. Gear; 55. Rack; 56. Fixed seat; 61. Motor; 621. Pointer; 622. Operating handle; 623. Dial. DETAILED DESCRIPTION

[0030] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0031] In Example 1 of the test device for studying gas insulation characteristics and breaking characteristics of the present invention:

[0032] The test device for studying gas insulation characteristics and breaking characteristics (hereinafter referred to as the test device) in the present invention includes a moving end support and a static end support. A moving end support is installed on the moving end support. By selectively installing a moving contact on the moving end support and installing a static contact on the static end support, the gas breaking characteristics can be studied. By selectively installing a moving end test electrode on the moving end support and installing a static end test electrode on the static end support, the gas insulation characteristics can be studied. That is to say, by replacing some components in the test device, one machine can be used for multiple purposes, and both the breaking characteristics of the gas and the insulation characteristics of the gas can be studied.

[0033] When it is necessary to study the gas breaking characteristics, such as Figure 1 As shown, the test device comprises a housing 1, with a moving end support and a static end support fixed at each end, forming a closed chamber for containing the gas to be tested. Specifically, in this embodiment, the moving end support and the static end support are a moving end insulator 21 and a static end insulator 22, respectively. A hollow moving end support 31 is fixed to the moving end insulator 21, and a moving contact 32 is housed within the moving end support 31.

[0034] like Figure 1 and Figure 4As shown, the movable contact 32 is partially located within the movable end support 31 and partially located outside the movable end support 31, wherein the movable contact 32 is guided and engaged with the inner wall of the movable end support 31. The test device also includes a shield support 34 detachably connected to the movable end support 31. A guide ring (not shown) is provided on the inner wall of the shield support 34 to guide and engage with the movable contact 32. A movable end shield cover 35 is also provided on the shield support 34. The movable contact 32 is restricted in its operation by guiding engagement within the movable end support 31 and guiding engagement on the shield support 34, respectively, facilitating better guiding engagement between the movable contact 32 and the stationary contact 42.

[0035] like Figure 1 and Figure 4 As shown, a static end support 41 is fixedly mounted on the static end insulator 22. A static contact 42 is fixedly mounted within the static end support 41. The static contact 42 is grounded, and when the movable contact 32 moves toward the static end insulator 22, the movable contact 32 and the static contact 42 are electrically connected. A static end shield 43 is also fixedly mounted on the static end support 41, and the static end shield 43 is disposed opposite the movable end shield 35.

[0036] like Figure 3 and Figure 4 As shown, the movable end support 31 is screwed together with the gasket 33 and the shield support 34 via bolts. The movable end shield cover 35 has a mounting platform at its end that can be fixedly connected to the shield support 34 via bolts. The movable end shield cover 35 has different models, such as the first movable end shield cover 351, the second movable end shield cover 352, and the third movable end shield cover 353. One of these models can be selected based on test requirements. The model of the static end shield cover 43 can be adjusted to suit different test requirements using the same method. A distance LP is maintained between the movable end shield cover 35 and the static end shield cover 43. To adjust the distance LP, the gasket 33 of different thicknesses can be replaced, the number of gaskets 33 can be adjusted, or the model of the shield support 34 can be changed.

[0037] like Figure 1 As shown, the housing 1 has an opening, which is fixedly connected to a fixed base 56. The outside of the fixed base 56 is fixedly connected to a motor 61. A metal rod 51 is rotatably mounted within the fixed base 56, which then sequentially drives and connects to an insulating rod 52 and a gear shaft 53. The gear shaft 53 is installed on the movable end support 31. The gear 54 is fixed on the gear shaft 53 and can rotate synchronously. The gear 54 and the rack 55 engage and transmit the power. When the motor 61 rotates, the power output by the motor 61 is sequentially transmitted through the drive rod composed of the metal rod 51, the insulating rod 52 and the gear shaft 53, and then converted into reciprocating motion of the rack 55. That is, through the rotation of the motor 61, the movable contact 32 can reciprocate along the inner wall of the shield support 34 to simulate the opening and closing motion of the product.

[0038] In the study of gas breaking characteristics, it is necessary to simulate the performance of insulating gas in actual products, so it is necessary to simulate the actual working state of the product. In the actual working process of the product, factors such as current size, opening and closing speed, shielding cover size and distance all play a role in the actual performance of the product. The current size is adjusted by external power supply; the opening and closing speed is adjusted by motor 61; the distance between shielding covers is adjusted by replacing different types of shielding supports 34 and gaskets 33; a detachable moving end shielding cover 35 and static end shielding cover 43 are provided to adjust the size of the shielding cover; that is, in the following example, Figure 1 In the test setup shown, various parameters related to product performance can be adjusted to facilitate measurement of sample diversity.

[0039] When it is necessary to study the gas insulation properties, such as Figure 2 As shown, only Figure 1 By replacing some of the components in the embodiment shown, a test device for gas insulation properties can be obtained. Figure 1 The moving contact 32, shield support 34, static contact 42, static end support 41 and motor 61 shown in FIG are removed and then replaced with Figure 2 Specifically, in the device shown, a movable rod 37 is slidably arranged inside the movable end support 31. The movable rod 37 is electrically connected to the movable end support 31, and the end of the movable rod 37 away from the movable end support 31 has a threaded hole for mounting the movable end electrode body 36. The movable rod 37 and the electrode body 36 constitute a movable end test electrode. A static end electrode holder 44 is provided on the static end insulator 22, and a static end test electrode 45 is mounted through the static end electrode holder 44 to form a set of electrodes. A protective cover 38 is also installed on the movable end support 31 to protect the insulating rod 52 during testing. In order to simulate different electric fields, Figure 2 The electrode body 36 and the static end test electrode 45 shown can be replaced with a slightly non-uniform electric field composed of a spherical electrode and a plate electrode, and an extremely non-uniform electric field composed of a conical electrode and a conical electrode. This is the existing technology and will not be described in detail here.

[0040] Also located outside the housing are an operating handle 621 and an operating dial 622, which are transmission-connected to the metal rod 51. The operating dial is equipped with a pointer (not shown), which rotates as the handle 621 rotates. A scale dial 623 is fixedly connected to the fixed base 56. The rotation angle of the operating handle 621 can be determined based on the pointer and scale dial 623. Furthermore, the change in the travel of the moving test electrode and, consequently, the change in the distance L between the moving and stationary test electrodes can be determined using the transmission ratio and tooth spacing data. The calculation process is conventional and will not be repeated here.

[0041] In the test of gas insulation characteristics, a series of tests can be carried out through the dynamic end test electrode and the static end test electrode 45 set at intervals. The test can be used to determine the breakdown distance of the insulating gas under a certain voltage condition; the test can also be used to determine the voltage required to break down the insulating gas under the premise of a certain distance... The angle of rotation of the handle can be accurately obtained by the operating handle 622, the pointer 621 and the dial 623 fixed on the fixed seat 56, and then the rotation angle is converted into the moving stroke based on the relationship between the gear 54 and the rack 55.

[0042] In Example 2 of the test device for studying gas insulation and interrupting characteristics of the present invention, a novel arrangement for the moving-end shield is proposed. Specifically, unlike Example 1, where both the moving-end and static-end shields are detachable, this embodiment utilizes a detachable moving-end shield, while the static-end shield is welded to the static-end support. Of course, in other embodiments, both the moving-end and static-end shields can be welded.

[0043] In Example 3 of the test device for studying gas insulation and interrupting characteristics of the present invention, a new arrangement is proposed for the mounting bracket on the drive mechanism. Specifically, unlike Example 1, which provided a mounting bracket on the housing for sealing and power transmission, this embodiment employs a sealing rubber ring at the housing opening. Neither a mounting bracket nor a metal rod are required. The insulating rod is inserted into the sealing rubber ring, maintaining the housing seal.

[0044] In Example 4 of the test device for studying gas insulation and interrupting characteristics of the present invention, a new arrangement is proposed for securing the moving rod and the electrode body. Specifically, unlike Example 1, where the moving rod and the electrode body were secured using a threaded connection, this embodiment has a light hole provided in the moving rod and a connecting post provided in the electrode body, and the two are fixedly connected using an interference fit.

[0045] In Example 5 of the test device for studying gas insulation and interrupting characteristics of the present invention, a new arrangement is proposed for securing the moving rod and electrode body. Specifically, unlike Example 1, where the moving rod and electrode body are removable, and the static electrode holder and static test electrode are also removable, the moving rod and electrode body in this embodiment are integrally formed. When replacement is required, the moving rod is simply removed and replaced, while the static electrode holder and static test electrode can be integrated and replaced as a whole.

[0046] In Example 6 of the test device for studying gas insulation and interrupting characteristics of the present invention, a novel arrangement of gaskets is proposed. Specifically, unlike Example 1, which used gaskets of varying numbers or thicknesses on the movable-end support to control the spacing between the movable-end and stationary-end shields, this embodiment eliminates the use of gaskets and instead controls the spacing between the two shields by replacing the different shield supports.

[0047] In Example 7 of the test device for studying gas insulation and interrupting characteristics of the present invention, a new arrangement is proposed for the mounting position of the moving-end shield. Specifically, unlike Example 1, where the moving-end shield is fixed to a shield support, this embodiment does not require a shield support. Instead, threaded holes are provided in the moving-end support, allowing the moving-end shield to be directly mounted on it. Of course, other embodiments can also omit the moving-end and stationary shields and still allow for gas interrupting characteristic studies.

[0048] In Example 8 of the test device for studying gas insulation and breaking characteristics of the present invention, a new arrangement is proposed for the operating mechanism and operating handle. Specifically, unlike Example 1, which separately provided a motor and an operating handle, this embodiment utilizes only a motor as the rotating mechanism. The speed and angle of the motor shaft are controlled by a controller, meeting the requirements of studying gas insulation and breaking characteristics.

[0049] In Example 9 of the test device for studying gas insulation and breaking characteristics of the present invention, a new arrangement for controlling the operating handle is proposed. Specifically, unlike Example 1, which used a pointer and dial to calculate distance, this example provides an observation window in the housing for distance control.

[0050] In Example 10 of the test device for studying gas insulation and breaking characteristics of the present invention, a new arrangement for the movable contact support is proposed. Specifically, unlike Example 1, where the movable contact insulator is provided as a movable contact support plate, the movable contact support extends through the movable contact support plate. The movable contact is driven by a drive mechanism, which is a hydraulic cylinder, pneumatic cylinder, or electric push rod capable of linear reciprocating motion.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A test device for studying gas insulation and breaking characteristics, characterized by: The test device includes a shell and a moving end support and a static end support respectively installed at the axial ends of the shell, the moving end support is installed with a moving end support, the moving end support is provided with a moving end mounting structure for mounting a moving contact or a moving end test electrode, the shell is provided with a driving mechanism for driving the moving contact or the moving end test electrode to move directly, and the static end support has a static end mounting structure for mounting a static end support or a static end electrode seat; during the test, by installing the moving contact on the moving end mounting structure, installing the static end support on the static end mounting structure and arranging the static contact on the static end support, the moving contact and the static contact are coordinated to carry out a gas breaking characteristic study; by installing the moving end test electrode on the moving end mounting structure, installing the static end electrode seat on the static end mounting structure and arranging the static end test electrode on the static end electrode seat, the moving end test electrode and the static end test electrode are coordinated to carry out a gas insulation characteristic study, and when switching between the gas insulation characteristic study and the gas breaking characteristic study, the corresponding components can be replaced.

2. The test device for studying gas insulation and breaking characteristics according to claim 1, characterized in that: The moving end support is a moving end insulator, and the moving end support is installed on the central insert of the moving end insulator. The driving mechanism includes a driving rod extending into the shell, and a gear is provided on the driving rod to drive the moving contact or the moving end test electrode to move directly through a gear rack structure. The driving mechanism also includes a rotating device for driving the driving rod to rotate.

3. The test device for studying gas insulation and breaking characteristics according to claim 2, characterized in that: The rotating device includes an operating mechanism connected to the driving rod when conducting gas breaking characteristic research, and the rotating device also includes an operating handle connected to the driving rod when conducting gas insulation characteristic research.

4. The test device for studying gas insulation and breaking characteristics according to claim 3, characterized in that: The test device for studying gas insulation characteristics and breaking characteristics also includes a dial fixedly arranged on the outside of the shell for conducting gas insulation characteristics research, and a pointer that matches the dial is fixed on the operating handle.

5. The test device for studying gas insulation and breaking characteristics according to any one of claims 1 to 3, characterized in that: The test device for studying gas insulation characteristics and breaking characteristics also includes a shielding support that is detachably connected to the moving end support, and a moving end shielding cover is installed on the shielding support. The test device also includes a static end shielding cover installed on the static end support. The static end shielding cover and the moving end shielding cover are used to shield the corresponding contacts when studying the gas breaking characteristics.

6. The test device for studying gas insulation and breaking characteristics according to claim 5, characterized in that: A gasket is sandwiched between the shielding support and the moving end support, so that the distance between the moving end shielding cover and the static end shielding cover can be changed by changing the number and / or thickness of the gasket.

7. The test device for studying gas insulation and breaking characteristics according to claim 5, characterized in that: The moving end shielding cover is fixedly connected to the shielding support by means of bolts, and the static end shielding cover is fixedly connected to the static end support by means of bolts.

8. The test device for studying gas insulation and breaking characteristics according to any one of claims 1 to 4, characterized in that: The moving end test electrode includes a moving rod and an electrode body mounted on the moving rod. The electrode body can be detachably mounted on the moving rod or / and the static end test electrode can be detachably mounted on the static end electrode holder to replace different types of electrode bodies or / and static end test electrodes.

9. The test device for studying gas insulation and breaking characteristics according to any one of claims 2 to 4, characterized in that: The driving mechanism also includes a fixing seat fixedly arranged on the outer side wall of the shell, and the driving rod includes an insulating rod extending into the shell and a metal rod rotatably installed in the fixing seat. The insulating rod and the metal rod are transmission-connected, and the metal rod is transmission-connected to the rotating device.

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