Stray current shielding device for lightning arrester leakage current test

Abstract

The utility model discloses a stray current shielding device for a lightning arrester leakage current test, which comprises an insulating cover sleeved on the outer surface of a grading ring detachably connected with an upper flange of a lightning arrester. The insulating cover bottom skirt edge is detachably connected to the lower end of the insulating cover, horizontally extends towards the lightning arrester and is in contact with the lightning arrester, so that a closed surface is formed at the bottom of the insulating cover; insulation shielding is formed between the upper flange and a pressurizing line mounted at the middle flange of the lightning arrester through the insulation cover and the skirt edge at the bottom of the insulation cover; the lightning arrester leakage current testing device has the advantages that insulation shielding is formed between the grading ring and the pressurization line arranged at the middle flange of the lightning arrester through the insulation cover, so that space stray current can be prevented from being generated, and the lightning arrester leakage current testing accuracy is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of arrester testing, and particularly relates to a stray current shielding device for testing the leakage current of an arrester. Background Technique

[0002] An arrester is generally a metal oxide arrester. During use, it has to bear the operating voltage for a long time, and there will be a continuous current passing through the internal resistor chips. At the same time, when the metal oxide arrester is instantaneously conducted under lightning overvoltage or switching overvoltage, it will also bear a large short-circuit current and is prone to aging of the resistor chips. Therefore, the DC reference voltage and leakage current of the arrester need to be tested at regular intervals.

[0003] However, when testing the leakage current of the upper section of the arrester, since the distance between the voltage application point and the grading ring (at zero potential) is relatively close, a strong spatial stray current will still be generated between the voltage application line drawn out at this time and the grading ring, affecting the accuracy of the test results. Therefore, we propose a stray current shielding device for testing the leakage current of an arrester. Content of the Utility Model

[0004] In view of the problems existing in the above technology, the utility model provides a stray current shielding device for testing the leakage current of an arrester. The stray current shielding device for testing the leakage current of an arrester is installed at the grading ring of the arrester, so as to avoid generating spatial stray current and ensure the accuracy of the leakage current test of the arrester.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A stray current shielding device for testing the leakage current of an arrester includes an insulating cover, and the insulating cover is sleeved on the outer surface of a grading ring that is detachably connected to the upper flange of the arrester;

[0007] The bottom skirt of the insulating cover is detachably connected to the lower end of the insulating cover, horizontally extends towards the arrester and contacts the arrester, so that the bottom of the insulating cover forms a closed surface;

[0008] An insulating shield is formed between the upper flange and the voltage application line installed at the middle flange of the arrester through the insulating cover and the bottom skirt of the insulating cover.

[0009] Further, after being unfolded, the insulating cover is a sector flat body adapted to the outer contour of the grading ring, and a magic tape is provided on the outer surface of one side edge, and a flocked cloth is provided on the inner surface of the other side edge.

[0010] Further, the bottom skirt of the insulating cover is unfolded into a quadrilateral plane, and its upper end is detachably connected to the lower end of the insulating cover through a buckle.

[0011] Further, a closing structure through which a pull rope can pass is formed at the lower end of the bottom skirt of the insulating cover.

[0012] Further, a plurality of hanging rings are provided at the upper edge of the insulating cover. The upper ends of the hanging rings are detachably connected with buckle rings through reinforcing ropes; the buckle rings are buckled on the upper end of the grading ring.

[0013] Further, a plurality of soft insulating clamping tubes are fixedly connected to the inner wall of the insulating cover at intervals. A clamping groove is formed on the soft insulating clamping tube, and the soft insulating clamping tube is clamped on the support column of the grading ring through the clamping groove.

[0014] The beneficial effects of the utility model are as follows:

[0015] (1) The stray current shielding device for testing the leakage current of the lightning arrester is installed at the grading ring of the lightning arrester, so as to form an insulating shield between the grading ring and the pressurizing wire installed at the upper flange of the lightning arrester, thereby avoiding the generation of spatial stray current and ensuring the accuracy of the leakage current test of the lightning arrester;

[0016] (2) The stray current shielding device for testing the leakage current of the lightning arrester can quickly install and disassemble the insulating cover on the grading ring through the cooperation of the magic tape and the flocked cloth, increasing the convenience of installation and disassembly; at the same time, a reinforcing rope and a buckle ring are arranged at the upper part of the insulating cover, soft insulating clamping tubes are arranged in the middle, and a closing structure and a pull rope are arranged at the bottom, ensuring the installation stability of the insulating cover on the grading ring;

[0017] (3) When conducting the leakage current test, it is not necessary to disassemble the grading ring, shortening the test time, that is, saving the power outage time and reducing the operation risk at the same time. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the installation of the utility model;

[0019] Figure 2 is a schematic structural diagram of the grading ring;

[0020] Figure 3 is an unfolded schematic structural diagram of the insulating cover of the utility model;

[0021] Figure 4 is a top view structural diagram of the insulating cover of the utility model.

[0022] In the figure:

[0023] 1 - lightning arrester, 2 - upper flange, 3 - grading ring, 4 - insulating cover, 5 - middle flange, 6 - pressurizing wire, 7 - bottom skirt of insulating cover, 8 - magic tape, 9 - pull rope, 10 - closing structure, 11 - hanging ring, 12 - reinforcing rope, 13 - buckle ring, 14 - soft insulating clamping tube, 15 - clamping groove, 16 - flocked cloth, 31 - support column. Detailed implementation manners

[0024] The following further describes the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. It should be noted here that the description of these implementation manners is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various implementation manners of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Refer to Figures 1-4 As shown, a stray current shielding device for testing the leakage current of a lightning arrester includes an insulating cover 4, and the insulating cover 4 is sleeved on the outer surface of a grading ring 3 that is detachably connected to the upper flange 2 of the lightning arrester 1; the lightning arrester 1 is the main body for shielding stray current in this application, and the grading ring 3 can balance the stray capacitance to the ground, make the voltage distribution uniform, and at the same time provide support for the insulating cover 4; the upper flange 2 is used to connect the grading ring.

[0026] The bottom skirt 7 of the insulating cover, the bottom skirt 7 of the insulating cover is detachably connected to the lower end of the insulating cover 4, extends horizontally towards the lightning arrester 1 and contacts the lightning arrester 1, so that a closed surface is formed at the bottom of the insulating cover 4; the insulating cover 4 and the bottom skirt 7 of the insulating cover are sleeved on the grading ring 3 to form a conical body with an open top and a closed bottom for shielding stray current.

[0027] An insulating shield is formed between the upper flange 2 and the pressurizing wire 6 installed at the middle flange 5 of the lightning arrester 1 through the insulating cover 4 and the bottom skirt 7 of the insulating cover.

[0028] Specifically, after the insulating cover 4 is unfolded, it is a fan-shaped flat body adapted to the outer contour of the grading ring 3. One side outer surface is provided with a magic tape 8, and the other side inner surface is provided with a flocked cloth 16. The setting of the magic tape 8 and the flocked cloth 16 facilitates the installation and disassembly of the insulating cover 4.

[0029] Specifically, the bottom skirt 7 of the insulating cover is unfolded into a quadrilateral plane, and its upper end is detachably connected to the lower end of the insulating cover 4 through a buckle. Through the connection of the buckle, it is convenient to directly snap during installation, improving work efficiency.

[0030] Specifically, a closing structure 10 through which a pull rope 9 can pass is formed at the lower end of the bottom skirt 7 of the insulating cover. The pull rope 9 is threaded through the closing structure 10. During installation, directly tightening the pull rope 9 can make the bottom skirt 7 of the insulating cover shrink and closely adhere to the lightning arrester 1.

[0031] Specifically, a plurality of hanging rings 11 are provided at the upper edge of the insulating cover 4. The upper ends of the hanging rings 11 are detachably connected to a buckle ring 13 through a reinforcing rope 12; the buckle ring 13 is buckled to the upper end of the grading ring 3. The hanging rings 11 are evenly arranged at the upper edge of the insulating cover 4. In cooperation with the fixing rope 12 and the buckle ring 13, the insulating cover 4 can be stably covered on the surface of the grading ring 3 to ensure the shielding effect.

[0032] Specifically, in order to further ensure the connection stability and the interference of high-altitude wind, a plurality of soft insulating clamping tubes 14 are fixedly connected to the inner wall of the insulating cover 4 at intervals. A clamping groove 15 is formed on the soft insulating clamping tube 14, and the soft insulating clamping tube 14 is clamped to the support column 31 of the grading ring 3 through the clamping groove 15.

[0033] The working principle of the present utility model:

[0034] When testing the leakage current of the lightning arrester, the stray current shielding device for testing the leakage current of the lightning arrester is installed on the outer surface and the bottom position of the grading ring 3. The insulating cover 4 can be connected to the fleece 16 through the magic tape 8, which facilitates the installation process of high-altitude operation. Then, by tightening the pull rope 9, the closing structure 10 contracts, so that the bottom skirt 7 of the insulating cover is in a contracted state and is closely attached to the lightning arrester 1. Finally, it is ensured that the insulating cover 4 and the bottom skirt 7 of the insulating cover are sleeved on the grading ring 3 to form a conical body with an open top and a closed bottom, thereby forming an insulating shielding effect. During the leakage current test of the lightning arrester, no spatial stray current will be generated, ensuring the accuracy of the leakage current test of the lightning arrester.

[0035] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present utility model, various changes, modifications, substitutions and variations to these embodiments still fall within the protection scope of the present utility model.

Claims

1. A stray current shielding device for testing the leakage current of a lightning arrester, characterized in that: Including, An insulating cover (4) sleeved on the outer surface of a grading ring (3) detachably connected to the upper flange (2) of a lightning arrester (1); An insulating cover bottom skirt (7) detachably connected to the lower end of the insulating cover (4), horizontally extending towards the lightning arrester (1) and contacting the lightning arrester (1), so as to form a closed surface at the bottom of the insulating cover (4); An insulating shield is formed between the upper flange (2) and a pressurizing wire (6) installed at the middle flange (5) of the lightning arrester (1) through the insulating cover (4) and the insulating cover bottom skirt (7).

2. The stray current shielding device for lightning arrester leakage current testing according to claim 1, characterized in that: After being unfolded, the insulating cover (4) is a sector planar body adapted to the outer contour of the grading ring (3), with a magic tape (8) provided on the outer surface of one side edge and a flannel (16) provided on the inner surface of the other side edge.

3. The stray current shielding device for lightning arrester leakage current testing according to claim 2, wherein: The insulating cover bottom skirt (7) is unfolded into a quadrilateral plane, and its upper end is detachably connected to the lower end of the insulating cover (4) through a buckle.

4. The stray current shielding device for lightning arrester leakage current testing according to claim 3, characterized in that: A closing structure (10) through which a pulling rope (9) can pass is formed at the lower end of the insulating cover bottom skirt (7).

5. The stray current shielding device for arrester leakage current testing according to claim 1, characterized in that: A plurality of hanging rings (11) are provided at the upper edge of the insulating cover (4), and a buckle ring (13) is detachably connected to the upper end of the hanging ring (11) through a reinforcing rope (12); the buckle ring (13) is buckled to the upper end of the grading ring (3).

6. The stray current shielding device for lightning arrester leakage current testing according to any one of claims 1-5, characterized in that: A plurality of soft insulating clamping tubes (14) are fixedly connected to the inner wall of the insulating cover (4) at intervals, a clamping groove (15) is formed on the soft insulating clamping tube (14), and the soft insulating clamping tube (14) is clamped to the support column (31) of the grading ring (3) through the clamping groove (15).

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