A transformer built-in lightning arrester zinc oxide element protection device

Abstract

The present invention relates to a protective device for zinc oxide components of a transformer built-in lightning arrester, comprising: an insulating protective tube, an insulating screw, an upper support ring, and a lower support ring. The inner diameter of the insulating protective tube is slightly larger than the outer diameter of the zinc oxide component, the height of the insulating protective tube is slightly smaller than the height of the zinc oxide component, and an opening for the appearance of the zinc oxide component is provided on the insulating protective tube. The insulating protective tube is sleeved on the outer side of the zinc oxide component. The insulating protective tube and the zinc oxide component are sandwiched between the upper support ring and the lower support ring. After two or more long insulating screws pass through the upper support ring and the lower support ring, the zinc oxide component and the copper connector between the upper support ring and the lower support ring are axially fixed and pressed, and the insulating protective tube can rotate around the zinc oxide component inside it. The protective tube can rotate around the zinc oxide component inside it to complete the appearance inspection of the zinc oxide component. At the same time, the strength of the protective tube is higher than that of the insulating protective plate, which can effectively improve the overall mechanical strength of the transformer built-in lightning arrester.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer production and manufacturing, and in particular relates to a transformer built-in lightning arrester zinc oxide element protection device. Background Art

[0002] The function of the built-in arrester of the transformer is to limit the oscillation of the transformer winding during switching, lightning or high-frequency transients. It is usually connected in parallel with the transformer voltage regulating winding. Each level or every two levels of the voltage regulating winding tap is connected in parallel with a lightning arrester module composed of zinc oxide elements.

[0003] The zinc oxide element is in the shape of a round pancake, coaxially arranged with the copper connector with connecting leads, and equipped with an insulating shield to protect the outer diameter side of the zinc oxide element. Since the zinc oxide element material is brittle and easy to damage, the insulating shield on the outer diameter side needs to be removed before use for appearance inspection. After the inspection, the shield needs to be reinstalled, which adds additional steps to the transformer production and affects production efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a protective device for a zinc oxide element of a transformer built-in lightning arrester, which can be used to inspect the appearance of the internal zinc oxide element through the observation window on the protective device without removing it, and at the same time increase the overall mechanical strength of the transformer built-in lightning arrester, thereby protecting the zinc oxide element of the transformer built-in lightning arrester. The technical solution adopted by the present invention is as follows:

[0005] A transformer built-in lightning arrester zinc oxide element protection device comprises: an insulating protection tube, an insulating screw, an upper support ring, and a lower support ring. The inner diameter of the insulating protection tube is slightly larger than the outer diameter of the zinc oxide element, the height of the insulating protection tube is slightly smaller than the height of the zinc oxide element, and an opening for inspecting the appearance of the zinc oxide element is provided on the insulating protection tube. The insulating protection tube is sleeved on the outer side of the zinc oxide element. The insulating protection tube and the zinc oxide element are clamped between the upper support ring and the lower support ring. After two or more long insulating screws pass through the upper support ring and the lower support ring, the zinc oxide element and the copper connector between the upper support ring and the lower support ring are axially fixed and pressed, and the insulating protection tube can rotate around the zinc oxide element inside it.

[0006] Preferably, the opening provided on the insulating protective tube for inspecting the appearance of the zinc oxide element is: a 10 mm wide through groove opened along the center line direction of the insulating protective tube.

[0007] Preferably, the openings provided on the insulating protective tube for inspecting the appearance of the zinc oxide element are: a plurality of observation windows provided on the insulating protective tube, and the size and number of the observation windows are preferably such that the overall appearance of the zinc oxide element therein can be observed.

[0008] Preferably, the number of the long insulating screws is three.

[0009] Preferably, the insulating protection tube is made of T4 insulating paperboard material with a wall thickness of 5 mm.

[0010] Preferably, the inner diameter of the insulating protection tube is 2 mm larger than the outer diameter of the zinc oxide element inside it.

[0011] The beneficial effects of the present invention are:

[0012] The protective tube can rotate around the zinc oxide element inside it, and complete the appearance inspection of the zinc oxide element in the process; at the same time, the strength of the protective tube is higher than that of the insulating protective plate, which can effectively improve the overall mechanical strength of the built-in lightning arrester of the transformer and realize the protection of the zinc oxide element of the built-in lightning arrester of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the present invention. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work.

[0014] Figure 1 is a front view of a zinc oxide element protection device according to an embodiment of the present invention;

[0015] Figure 2 is a top view of a zinc oxide element protection device according to an embodiment of the present invention;

[0016] In the figure: 1 is an insulating protective tube, 2 is a zinc oxide element, 3 is a long insulating screw, 4 is an upper supporting ring, and 5 is a lower supporting ring. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] Embodiment 1

[0019] like Figure 1 , which is a front view of a zinc oxide element protection device according to an embodiment of the present invention; Figure 2The figure shows a top view of a zinc oxide element protection device of an embodiment of the present invention. A zinc oxide element protection device for a built-in lightning arrester of a transformer comprises: an insulating protection tube 1, an insulating screw 3, an upper support ring 4, and a lower support ring 5. The inner diameter of the insulating protection tube 1 is slightly larger than the outer diameter of the zinc oxide element 2, the height of the insulating protection tube 1 is slightly smaller than the height of the zinc oxide element 2, and a 10mm wide through groove is opened along the center line direction of the insulating protection tube 1 for inspecting the appearance of the zinc oxide element 2. The insulating protection tube 1 is sleeved on the outer side of the zinc oxide element 2; the insulating protection tube 1 and the zinc oxide element 2 are sandwiched between the upper support ring 4 and the lower support ring 5, and the zinc oxide element and the copper connector between the upper and lower support rings are axially fixed and pressed after two or more long insulating screws 3 pass through the upper support ring 4 and the lower support ring 5, and the insulating protection tube 1 can rotate around the zinc oxide element 2 inside it for inspecting the appearance of the zinc oxide element 2; at the same time, the insulating protection tube 1 with the through groove has higher strength than the insulating protective plate.

[0020] Furthermore, the insulating protection tube 1 is made of T4 insulating paperboard material with a wall thickness of 5 mm. The inner diameter of the insulating protection tube 1 is 2 mm larger than the outer diameter of the zinc oxide element 2 inside it, which not only protects its strength but also saves materials.

[0021] Embodiment 2

[0022] The insulating protection tube 1 in the first embodiment has no through grooves, but is provided with a plurality of observation windows. The size and number of the observation windows are preferably such that the overall appearance of the zinc oxide element 2 therein can be observed.

[0023] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A transformer built-in lightning arrester zinc oxide element protection device, characterized in that: include: An insulating protection tube (1), an insulating screw (3), an upper support ring (4), and a lower support ring (5); the inner diameter of the insulating protection tube (1) is larger than the outer diameter of the zinc oxide element (2); the height of the insulating protection tube (1) is smaller than the height of the zinc oxide element (2); an opening for inspecting the appearance of the zinc oxide element (2) is provided on the insulating protection tube (1); the insulating protection tube (1) is sleeved on the outer side of the zinc oxide element (2); the insulating protection tube (1) and the zinc oxide element (2) are clamped between the upper support ring (4) and the lower support ring (5); after two or more long insulating screws (3) pass through the upper support ring (4) and the lower support ring (5), the zinc oxide element (2) and the copper connector between the upper support ring (4) and the lower support ring (5) are axially fixed and pressed, and the insulating protection tube (1) can rotate around the zinc oxide element (2) inside it; The opening provided on the insulating protective tube (1) for inspecting the appearance of the zinc oxide element (2) is: a 10 mm wide through groove opened along the center line direction of the insulating protective tube (1); or, The openings provided on the insulating protective tube (1) for inspecting the appearance of the zinc oxide element (2) are: a plurality of observation windows provided on the insulating protective tube (1), the size and number of the observation windows being suitable for being able to observe the overall appearance of the zinc oxide element (2) therein; The number of the long insulating screws (3) is three; The inner diameter of the insulating protection tube (1) is 2 mm larger than the outer diameter of the zinc oxide element (2) inside it.

2. A transformer built-in lightning arrester zinc oxide element protection device according to claim 1, characterized in that: The insulating protection tube (1) is made of T4 insulating paperboard material with a wall thickness of 5 mm.

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