Novel oiled paper capacitance type high-voltage bushing end screen grounding device

Abstract

The utility model discloses a novel oiled paper capacitance type high-voltage bushing end screen grounding device, which comprises an end screen grounding cover arranged at the top of a bushing seat, a built-in spring and an abutting block are arranged on the inner side of the end screen grounding cover, an end screen grounding copper column is arranged in the bushing seat, and the abutting block is arranged on the inner side of the end screen grounding cover. The top end of the end screen grounding copper column is inserted into the inner side of the end screen grounding cover and abuts against the abutting block, an end screen grounding test hole is formed in the surface of the end screen grounding cover in a penetrating mode, and a sealing screw is screwed into the end screen grounding test hole. The device effectively solves the problem that whether the built-in end screen device of the oiled paper capacitance type high-voltage bushing is grounded well or not cannot be judged after being grounded, and when a unit is overhauled, stopped or tested, a universal meter can be used for measuring the actual grounding condition of the end screen grounding copper column so as to judge whether the bushing end screen is grounded well or not. Through testing, the defect of poor contact of the bushing tap caused by reduced elastic force of the spring, deformation, fracture or untight buckling of the grounding cover can be effectively found, and the grounding reliability of the bushing tap is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-voltage bushing end screen grounding, and in particular relates to a novel oil-paper capacitor type high-voltage bushing end screen grounding device. Background Art

[0002] In recent years, many main transformer accidents in the power system are caused by poor contact of the high-voltage bushing end screen. The poor grounding of the end screen will cause local discharge and heat from the zero screen of the bushing to the middle flange, resulting in insulation breakdown between capacitor screens, damage to the insulation of the bushing end screen and lead wire, and cause bushing explosion, transformer damage, and fire accidents.

[0003] The grounding method of the end screen of the oil-paper capacitor high-voltage bushing of the transformer is mostly built-in grounding, that is, the grounding copper column is led out of the end screen of the high-voltage bushing, and is grounded by pressing the built-in spring through contact with the copper connecting piece in the grounding cover. This grounding method is simple and convenient. After maintenance, the cover can be directly screwed into place. However, when the elastic force of the grounding spring is reduced, deformed or broken, it will cause poor contact with the lead column, resulting in failure of reliable grounding of the end screen; after the grounding cover is covered, it is impossible to use a multimeter to check whether the end screen is grounded, and it is impossible to judge the actual grounding condition of the grounding copper column. There is a hidden danger that the end screen may be poorly grounded. For this reason, the utility model proposes a novel oil-paper capacitor high-voltage bushing end screen grounding device. Utility Model Content

[0004] The utility model aims to provide a novel oil-paper capacitor high-voltage bushing end screen grounding device to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel oil-paper capacitor high-voltage bushing end screen grounding device, comprising an end screen grounding cover installed on the top of the bushing seat, the inner side of the end screen grounding cover is provided with a built-in spring and a stop block, an end screen grounding copper column is provided in the bushing seat, and the top end of the end screen grounding copper column is inserted into the inner side of the end screen grounding cover and abuts against the stop block, an end screen grounding test hole is provided through the surface of the end screen grounding cover, and a closing screw is screwed into the end screen grounding test hole, a waterproof cover is installed on the surface of the end screen grounding cover, and the waterproof cover covers the closing screw on the inside.

[0006] Preferably, the closing screw is threadedly connected to the end-screen grounding test hole, and a limit block is also provided at the inner end of the end-screen grounding test hole.

[0007] Preferably, two guide blocks are symmetrically fixed on the surface of the stop block, and two guide slideways corresponding to the guide blocks are provided inside the end-screen grounding cover, and the guide blocks are slidably located in the guide slideways.

[0008] Preferably, one end of the built-in spring is fixed to the inner wall of the end-screen grounding cover, and the other end of the built-in spring is fixedly connected to the stop block.

[0009] Preferably, an integrated threaded seat is provided at the bottom end of the end-screen grounding cover, and the threaded seat is screwed into the inner side of the sleeve seat.

[0010] Preferably, the inner wall of the bottom end of the waterproof cover is provided with an integrated annular sealing strip, the surface of the end screen grounding cover is provided with an annular sealing groove corresponding to the annular sealing strip, the annular sealing strip is squeezed into the annular sealing groove, and the top surface of the waterproof cover is provided with an annular outer groove.

[0011] Preferably, an annular rubber seat is embedded at the bottom edge of the end screen grounding cover, an integrated annular protrusion is provided at the bottom of the annular rubber seat, an annular top groove corresponding to the annular protrusion is opened on the top surface of the sleeve seat, and the annular protrusion is embedded in the annular top groove.

[0012] Compared with the prior art, the beneficial effects of the utility model are: the device effectively solves the problem that it is impossible to judge whether the grounding is good after the built-in end screen device of the oil-paper capacitor high-voltage bushing is grounded. When the unit is overhauled, shut down or tested, a multimeter can be used to measure the actual grounding condition of the end screen grounding copper column to judge whether the bushing end screen is well grounded. Through the test, poor contact defects of the bushing end screen caused by reduced spring elastic force, deformation, breakage or loose grounding cover can be effectively discovered, thereby improving the grounding reliability of the bushing end screen, laying a solid foundation for early discovery and resolution of poor grounding defects of the bushing end screen, and ensuring the safe and reliable operation of the transformer bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model;

[0014] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A area;

[0015] Figure 3 For this utility model Figure 1 A partial enlarged view of the middle B area;

[0016] Figure 4 For this utility model Figure 1 A partial enlarged view of the middle C area;

[0017] In the figure: 1. end screen grounding cover; 11. guide slide; 12. annular sealing groove; 13. annular rubber seat; 14. annular protrusion; 2. casing seat; 21. annular top groove; 3. end screen grounding copper column; 4. threaded seat; 5. end screen grounding test hole; 51. limit block; 6. closing screw; 7. built-in spring; 8. stop block; 81. guide block; 9. waterproof cover; 91. annular outer groove; 92. annular sealing strip. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example 1

[0020] See also Figures 1 to 3 , which is the first embodiment of the utility model, and this embodiment provides a technical solution: a new type of oil-paper capacitor high-voltage bushing end screen grounding device, comprising an end screen grounding cover 1 installed on the top of the bushing seat 2, the inner side of the end screen grounding cover 1 is provided with a built-in spring 7 and a stop block 8, an end screen grounding copper column 3 is provided in the bushing seat 2, and the top end of the end screen grounding copper column 3 is inserted into the inner side of the end screen grounding cover 1 and abuts against the stop block 8 to achieve daily grounding, an end screen grounding test hole 5 is opened through the surface of the end screen grounding cover 1, and a closing screw 6 is screwed into the end screen grounding test hole 5, a waterproof cover 9 is installed on the surface of the end screen grounding cover 1, and the waterproof cover 9 covers the closing screw 6 on the inside.

[0021] The closing screw 6 and the end screen grounding test hole 5 are threadedly connected, so that the closing screw 6 can be rotated and disassembled by a screwdriver. A limit block 51 is also provided at the inner end of the end screen grounding test hole 5 to prevent the closing screw 6 from being over-screwed.

[0022] Among them, two guide blocks 81 are symmetrically fixed on the surface of the stop block 8, and two guide slides 11 corresponding to the guide blocks 81 are opened inside the end screen grounding cover 1. The guide block 81 slides in the guide slides 11, so that the stop block 8 can be stably pushed and slid in the end screen grounding cover 1 by the built-in spring 7.

[0023] One end of the built-in spring 7 is fixed to the inner wall of the end-screen grounding cover 1 , and the other end of the built-in spring 7 is fixedly connected to the stop block 8 to ensure the installation stability of the built-in spring 7 .

[0024] The bottom end of the end screen grounding cover 1 is provided with an integrated threaded seat 4 , and the threaded seat 4 is screwed into the inner side of the sleeve seat 2 , and the threaded seat 4 is threadedly connected to the inner wall of the sleeve seat 2 .

[0025] Among them, the inner wall of the bottom end of the waterproof cover 9 is provided with an integrated annular sealing strip 92, both of which are made of rubber material and will undergo elastic deformation when squeezed. The surface of the end screen grounding cover 1 is provided with an annular sealing groove 12 corresponding to the annular sealing strip 92, and the annular sealing strip 92 is squeezed into the annular sealing groove 12 to ensure the installation stability and sealing of the waterproof cover 9.

[0026] Among them, an annular outer groove 91 is opened on the top surface of the waterproof cover 9, which is convenient for subsequent operators to pull up the annular outer groove 91 when removing the waterproof cover 9.

[0027] In summary, in actual use, the waterproof cover 9 can be directly removed, and then the closed screw 6 can be rotated and unscrewed with a screwdriver to expose the end-screen grounding test hole 5. At this time, the multimeter can be used to measure the end-screen DC resistance of the end-screen grounding copper column 3 to the ground, that is, the test head of the multimeter is inserted through the end-screen grounding test hole 5, so that the multimeter test head is in contact with the end-screen grounding copper column 3, thereby measuring the actual grounding condition of the end-screen grounding copper column 3, so as to judge the grounding condition of the end screen.

[0028] Example 2

[0029] See also Figures 1 to 4 , which is the second embodiment of the utility model, is based on the previous embodiment, and the difference is that the sealing performance of the connection between the end screen grounding cover 1 and the sleeve seat 2 can be improved by setting the annular rubber seat 13, the annular protrusion 14 and the annular top groove 21.

[0030] Specifically, an annular rubber seat 13 is embedded at the bottom edge of the end screen grounding cover 1, and an integrated annular protrusion 14 is provided at the bottom of the annular rubber seat 13. Both are made of rubber material and will undergo elastic deformation when squeezed. An annular top groove 21 corresponding to the annular protrusion 14 is provided on the top surface of the sleeve seat 2, and the annular protrusion 14 is embedded in the annular top groove 21, further improving the sealing of the connection between the end screen grounding cover 1 and the sleeve seat 2.

[0031] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel oil-paper capacitor type high voltage bushing end screen grounding device, comprising an end screen grounding cover (1) mounted on the top of a bushing seat (2), characterized in that: The inner side of the end screen grounding cover (1) is provided with a built-in spring (7) and a stopper (8); the sleeve seat (2) is provided with an end screen grounding copper column (3), and the top end of the end screen grounding copper column (3) is inserted into the inner side of the end screen grounding cover (1) and abuts against the stopper (8); the surface of the end screen grounding cover (1) is provided with an end screen grounding test hole (5), and a closing screw (6) is screwed into the end screen grounding test hole (5); the surface of the end screen grounding cover (1) is sleeved with a waterproof cover (9), and the waterproof cover (9) covers the closing screw (6) on the inside.

2. A novel oil-paper capacitor high-voltage bushing end screen grounding device according to claim 1, characterized in that: The closing screw (6) is threadedly connected to the end-screen grounding test hole (5), and a limit block (51) is also provided at the inner end of the end-screen grounding test hole (5).

3. A novel oil-paper capacitor high-voltage bushing end screen grounding device according to claim 1, characterized in that: Two guide blocks (81) are symmetrically fixed on the surface of the stop block (8), and two guide slideways (11) corresponding to the guide blocks (81) are provided inside the end screen grounding cover (1), and the guide blocks (81) are slidably located in the guide slideways (11).

4. According to claim 1, a novel oil-paper capacitor type high-voltage bushing end screen grounding device is characterized in that: One end of the built-in spring (7) is fixed to the inner wall of the end screen grounding cover (1), and the other end of the built-in spring (7) is fixedly connected to the stop block (8).

5. According to claim 1, a novel oil-paper capacitor type high-voltage bushing end screen grounding device is characterized in that: An integrated threaded seat (4) is provided at the bottom end of the end screen grounding cover (1), and the threaded seat (4) is screwed into the inner side of the sleeve seat (2).

6. The novel oil-paper capacitor high-voltage bushing end screen grounding device according to claim 1 is characterized in that: The inner wall of the bottom end of the waterproof cover (9) is provided with an integrated annular sealing strip (92), and the surface of the end screen grounding cover (1) is provided with an annular sealing groove (12) corresponding to the annular sealing strip (92), and the annular sealing strip (92) is squeezed into the annular sealing groove (12).

7. The novel oil-paper capacitor high-voltage bushing end screen grounding device according to claim 1 is characterized in that: The top surface of the waterproof cover (9) is provided with an annular outer groove (91).

8. The novel oil-paper capacitor type high voltage bushing end screen grounding device according to claim 1 is characterized in that: An annular rubber seat (13) is embedded at the bottom edge of the end screen grounding cover (1), an integral annular protrusion (14) is provided at the bottom of the annular rubber seat (13), an annular top groove (21) corresponding to the annular protrusion (14) is provided on the top surface of the sleeve seat (2), and the annular protrusion (14) is embedded in the annular top groove (21).

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