Gas insulation characteristic test device and method

Abstract

The invention provides a gas insulation characteristic test device and method, the device comprises a transition cylinder, a support insulation basin, a cylinder and a side cover plate which are connected in sequence, the support insulation basin, the cylinder and the side cover plate form a closed cavity, and the cavity is filled with tested gas; the supporting insulation basin is connected with the first electrode shaft, and the first electrode shaft is provided with first electrode tips in different forms according to needs; a plurality of electrode mounting positions are distributed on the side cover plate, each electrode mounting position is provided with a second electrode shaft capable of axially sliding, the first electrode shaft and the second electrode shaft are oppositely arranged and located in the cavity, and second electrode tips in different forms are mounted on the second electrode shaft according to needs. The distance between the first electrode shaft and the second electrode shaft is adjusted by controlling the axial stroke of the second electrode shaft; and an observation window is arranged on the cylinder body. After the gas insulation characteristic test device is assembled at one time, insulation characteristic verification tests of various influence factors and various electrode forms can be carried out, and the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of gas insulation characteristic test, in particular to a gas insulation characteristic test device and method. Background Art

[0002] Since SF6 gas has an extremely high greenhouse effect potential (about 22,800 times that of CO2 gas), its application is strictly restricted. In order to reduce the use of SF6 gas in high-voltage electrical appliances, finding environmentally friendly SF6 alternative gases as insulating media as soon as possible has become an urgent problem for high-voltage switch manufacturers.

[0003] To understand the discharge characteristics of a new type of insulating gas, it is usually necessary to use experimental methods to obtain the breakdown characteristics of the air gap formed by some typical electrodes (such as "needle-plate", "rod-plate", "rod-rod", "ball-ball", etc.) to meet the needs of product design and engineering applications. Since there are many factors that affect the breakdown characteristics of gas insulating media (mainly electric field type, voltage type, inflation pressure, electrode surface area, surface roughness, coating type and thickness, etc.), it is necessary to carry out hundreds or even thousands of discharge tests. In the existing gas insulation characteristics test device, after the gas discharges several times, the test device needs to be returned to the gas, disassembled, wiped or replaced, assembled, vacuumed, and inflated. This is repeated hundreds or thousands of times, which greatly reduces the test efficiency, is not conducive to quickly mastering the insulation characteristics of new environmentally friendly gases, and restricts the development progress of environmentally friendly switch products.

[0004] In summary, when the existing technology is used to study the breakdown characteristics of new insulating gases, especially when studying the effects of different electric field non-uniformity coefficients, different insulating coatings, and different roughness on the gas insulation characteristics, there is a problem that the state of the test piece deteriorates after several breakdowns, and the test piece needs to be replaced frequently. The disassembly and assembly of the test equipment leads to a long R&D cycle and low test efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a gas insulation characteristic test device and method. After the gas insulation characteristic test device is assembled once, insulation characteristic verification tests with multiple influencing factors and multiple electrode forms can be performed to improve the test efficiency.

[0006] A gas insulation characteristic test device comprises a transition cylinder, a supporting insulation basin, a cylinder and a side cover plate which are connected in sequence, wherein the supporting insulation basin, the cylinder and the side cover plate form a closed cavity which is filled with a test gas; the supporting insulation basin is connected to a first electrode shaft, on which a first electrode head of different forms is installed as required; a plurality of electrode mounting positions are distributed on the side cover plate, each of which is respectively installed with an axially slidable second electrode shaft, the first electrode shaft and the second electrode shaft are arranged opposite to each other and are located in the cavity, on which a second electrode head of different forms is installed as required, and the distance between the first electrode shaft and the second electrode shaft is adjusted by controlling the axial stroke of the second electrode shaft; an observation window is provided on the cylinder.

[0007] Furthermore, a first sealing ring and a second sealing ring are respectively installed on the left and right sides of the supporting insulating basin.

[0008] Furthermore, the insert supporting the insulating basin is connected to the first electrode shaft by bolts.

[0009] Furthermore, the outer side of the cylinder is connected to the side cover plate by bolts, a shielding cover is installed in the gap between the cylinder and the side cover plate, and a third sealing ring and a fourth sealing ring are installed on the left and right sides of the shielding cover respectively.

[0010] Furthermore, a fifth sealing ring is installed on the contact surface between each second electrode shaft and the side cover plate.

[0011] Furthermore, the first electrode head and the second electrode head have a needle-like, plate-like, rod-like or spherical structure, and the first electrode head and the second electrode head form different test electrodes.

[0012] Furthermore, the second electrode axis is provided with a scale.

[0013] A gas insulation property test method is carried out using the device, and the method comprises the following steps:

[0014] Step 1: According to the test needs, adjust the second electrode axis as the current test axis to a certain scale, the second electrode head of the current test axis is used as the current test head, and the other second electrode axes are used as non-test axes. Driven by the axial movement of the second electrode axis, the second electrode heads on the non-test axes retreat to the shielding range of the shielding cover, and apply voltage to the first electrode head and the second electrode head as the current test head. Through the observation window, the discharge phenomenon in the gas gap δ is observed in the electrode form composed of the first electrode head and the second electrode head; after the test is performed m times in this posture, the test results are recorded, and the first group of tests is completed;

[0015] Step 2: By adjusting the axial stroke of the current test axis again, changing the value of the gas gap δ to change the electric field non-uniformity coefficient, under this test posture, applying voltage to the first electrode head and the second electrode head as the current test head, after performing the test m times, recording the test results, and the second set of tests ends;

[0016] Step 3: Exchange the test axis and the non-test axis of the second electrode axis, apply voltage to the first electrode head and the second electrode head serving as the current test head, perform the test m times, record the test results, and the third set of tests ends.

[0017] The present invention sets a plurality of electrode installation positions on one side of the insulation test cylinder, and can install electrode test heads of different shapes (needle-shaped, spherical, plate-shaped, etc.) according to needs. Each installation position has a sealing groove, and a sealing ring is installed. The electrode can slide axially in the installation position, and a scale is set on the electrode shaft handle. The sliding stroke is adjusted according to needs to meet the expected test electric field requirements. After the gas insulation characteristic test device is assembled once, combined with the type of the electrode test head installed in the electrode installation position, the sliding stroke of the electrode shaft is adjusted to carry out insulation verification tests of various different influencing factors, thereby improving the test efficiency, reducing the use of insulating gas, and saving the test cost. Compared with the traditional single-electrode insulation characteristic test tooling, the test verification efficiency of the influencing factors of the insulation characteristics of the new environmentally friendly gas can be improved, and the development progress of the new environmentally friendly gas type GIS product can be accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a gas insulation property test device according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A-direction view;

[0020] Figure 3 is a schematic structural diagram of a first electrode head and a second electrode head in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the combination of the first electrode head and the second electrode head in an embodiment of the present invention.

[0022] In the figure: 1—transition cylinder; 2—insulating support basin; 3—cylinder; 4—shielding cover; 5—third sealing ring; 6—fourth sealing ring; 7—side cover; 8—fifth sealing ring (n pieces); 9—first sealing ring; 10—second sealing ring; 11—first electrode shaft; 12—first electrode head; 13—observation window; 14—second electrode head (n pieces); 15—second electrode shaft (n pieces). DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a gas insulation property test device, comprising a transition cylinder 1, a supporting insulation basin 2 and a cylinder 3 which are sequentially connected by bolts.

[0025] The first sealing ring 9 and the second sealing ring 10 are respectively installed on the left and right sides of the supporting insulating basin 2. The insert of the supporting insulating basin 2 is connected to the first electrode shaft 11 by bolts. The first electrode shaft 11 can be installed with different forms of first electrode heads 12 as needed. The forms of the first electrode heads 12 are shown in FIG. Figure 3 .

[0026] The outer side of the cylinder 3 is connected to the side cover 7 by bolts. The shielding cover 4 is installed in the gap between the cylinder 3 and the side cover 7. The third sealing ring 5 and the fourth sealing ring 6 are installed on the left and right sides of the shielding cover 4. There are several electrode installation positions distributed on the side cover 7. Each electrode installation position is respectively installed with a second electrode shaft 15 that can slide axially. Each second electrode shaft 15 is installed with a fifth sealing ring 8 on the contact surface with the side cover 7. Different forms of second electrode heads 14 can be installed on the second electrode shaft 15 according to needs. The forms of the second electrode heads 14 are shown in FIG. Figure 3 . The first electrode head 12 and the second electrode head 14 can form a test electrode. The above-mentioned various structural parts cooperate with the supporting insulating basin 2, the cylinder 3 and the side cover plate 7 to form a closed cavity, and the cavity is filled with the test gas. In order to facilitate the observation of the discharge phenomenon of the test gas during the insulation test, an observation window 13 is provided on the cylinder 3. There is a scale on the second electrode shaft 15, which can accurately control the axial stroke, adjust the distance δ between the first electrode shaft 11 and the second electrode shaft 15, and adjust the electrode gap according to actual needs, that is, adjust the uneven coefficient of the electric field.

[0027] Figure 1 The first electrode head 12 and the second electrode head 14 are only for illustration. The specific electrode combination is as follows: Figure 4 As shown, various electrode types such as needle-plate (1), rod-rod (2), rod-plate (3), plate-plate (4), ball-ball (5), ball-plate (6) can be formed to meet different test requirements.

[0028] The second electrode head 14 can be installed with one or n electrodes as needed. If only the second electrode shaft 15 at the center is used, rod-rod, ball-ball, plate-plate electrodes can be formed. At the same time, the δ value can be controlled to verify the insulation strength of rod-rod and ball-ball electrodes under different gas gaps. Figure 3 (b) rod electrode, then a rod-rod electrode is formed; if the second electrode head 14 is installed Figure 3 (d) ball electrode, then a ball-ball electrode is formed; if the second electrode head 14 is installed Figure 3 The (c) plate electrode in the structure forms a plate-plate electrode.

[0029] When n second electrode heads 14 are installed, n first electrode heads 12 are installed. Figure 2 (c) plate electrode, the second electrode head 14 is installed Figure 3 (a) needle electrode in the figure, then a needle-plate electrode is formed; when the first electrode head 12 is installed Figure 3 (c) plate electrode, the second electrode head 14 is installed Figure 3 (b) rod electrode, then a rod-plate electrode is formed; when the first electrode head 12 is installed Figure 3 (c) plate electrode, the second electrode head 14 is installed Figure 3 The ball electrode (d) in the figure forms a ball-plate electrode. By controlling the δ value, the insulation strength of the needle-plate, rod-plate, and ball-plate under different gas gaps is verified. If the rod, ball, and plate electrodes are manufactured with different roughness or different thicknesses and different types of coatings, the influence of different roughness and different thicknesses and different types of coatings under different gas gaps on the insulation strength of the rod-plate and ball-plate electrodes can be further verified.

[0030] The embodiment of the present invention also provides a gas insulation property test method, which is performed using the above device. When performing the insulation test, the electrode heads (first electrode head 12, second electrode head 14) are installed on the electrode shafts (first electrode shaft 11, second electrode shaft 15) on both sides, and the cylinder 3 is inflated to the required value according to the test gas pressure requirements. The method comprises the following steps:

[0031] Step 1: According to the test needs, adjust the second electrode axis 15 (called the current test axis) to a certain scale, and the remaining second electrode heads 14 are driven by the axial movement of the second electrode axis 15 (called the non-test axis) to retreat to the shielding range of the shielding cover 4, and apply voltage to the first electrode head 12 and the second electrode head 14 (called the current test head). At this time, the discharge phenomenon in the gas gap δ can be seen through the observation window 13 in the electrode form composed of the first electrode head 12 and the second electrode head 14. After the test is performed m times in this posture, the test results are recorded, and the first group of tests is completed.

[0032] Step 2: By adjusting the axial stroke of the second electrode shaft 15 (called the current test shaft) again, the value of the gas gap δ is changed (after the change, it is δ'), and the electric field non-uniformity coefficient is also changed. In this test posture, voltage is applied to the first electrode head 12 and the second electrode head 14 (called the current test head). After conducting the test m times, the test results are recorded and the second set of tests is completed.

[0033] Step 3: Exchange the test axis and the non-test axis of the second electrode axis 15, apply voltage to the first electrode head 12 and the second electrode head 14 (referred to as the current test head), perform the test m times, record the test results, and the third set of tests is completed.

[0034] Electrode test heads of different forms and states can be installed in the electrode installation position of the present invention, and cooperate with the electrode on the other side of the cylinder to form typical electrode forms such as "needle-plate", "rod-plate", "rod-rod", "ball-ball", and "ball-plate". Insulation characteristic tests under different electrode forms and different electrode states can be completed without disassembling the test device, thereby improving the test efficiency.

[0035] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A gas insulation properties test device, characterized in that: It includes a transition cylinder, a supporting insulating basin, a cylinder and a side cover plate which are connected in sequence, wherein the supporting insulating basin, the cylinder and the side cover plate form a closed cavity which is filled with the test gas; the supporting insulating basin is connected to the first electrode shaft, and the first electrode shaft is provided with a first electrode head of different forms as required; a plurality of electrode mounting positions are distributed on the side cover plate, and each electrode mounting position is provided with an axially slidable second electrode shaft, the first electrode shaft and the second electrode shaft are arranged opposite to each other and are located in the cavity, and the second electrode heads of different forms are provided on the second electrode shaft as required, and the distance between the first electrode shaft and the second electrode shaft is adjusted by controlling the axial stroke of the second electrode shaft; an observation window is provided on the cylinder.

2. The gas insulation characteristics test device according to claim 1, characterized in that: The first sealing ring and the second sealing ring are respectively installed on the left and right sides of the supporting insulating basin.

3. The gas insulation characteristics test device according to claim 1, characterized in that: The insert supporting the insulating basin is connected to the first electrode shaft via bolts.

4. The gas insulation characteristics test device according to claim 1, characterized in that: The outer side of the cylinder is connected to the side cover plate by bolts, a shielding cover is installed in the gap between the cylinder and the side cover plate, and a third sealing ring and a fourth sealing ring are installed on the left and right sides of the shielding cover respectively.

5. The gas insulation characteristics test device according to claim 1, characterized in that: A fifth sealing ring is installed on the contact surface between each second electrode shaft and the side cover plate.

6. The gas insulation characteristics test device according to claim 1, characterized in that: The first electrode head and the second electrode head have a needle-like, plate-like, rod-like or spherical structure, and the first electrode head and the second electrode head form different test electrodes.

7. The gas insulation characteristics test device according to claim 1, characterized in that: The second electrode shaft is provided with a scale.

8. A gas insulation properties test method, characterized in that: The method is carried out using the device according to any one of claims 1 to 7, and comprises the following steps: Step 1: According to the test needs, adjust the second electrode axis as the current test axis to a certain scale, the second electrode head of the current test axis is used as the current test head, and the other second electrode axes are used as non-test axes. Driven by the axial movement of the second electrode axis, the second electrode heads on the non-test axes retreat to the shielding range of the shielding cover, and apply voltage to the first electrode head and the second electrode head as the current test head. Through the observation window, the discharge phenomenon in the gas gap δ is observed in the electrode form composed of the first electrode head and the second electrode head; after the test is performed m times in this posture, the test results are recorded, and the first group of tests is completed; Step 2: By adjusting the axial stroke of the current test axis again, changing the value of the gas gap δ to change the electric field non-uniformity coefficient, under this test posture, applying voltage to the first electrode head and the second electrode head as the current test head, after performing the test m times, recording the test results, and the second set of tests ends; Step 3: Exchange the test axis and the non-test axis of the second electrode axis, apply voltage to the first electrode head and the second electrode head serving as the current test head, perform the test m times, record the test results, and the third set of tests ends.

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