WO2023029128A1

WO2023029128A1 - Tap terminal having dual-point grounding

Info

Publication number: WO2023029128A1
Application number: PCT/CN2021/120158
Authority: WO
Inventors: 吕刚; 吕金壮; 唐华东
Original assignee: 中国南方电网有限责任公司超高压输电公司贵阳局
Priority date: 2021-09-06
Filing date: 2021-09-24
Publication date: 2023-03-09
Also published as: CN113871970B; JP2023542803A; DE112021003201T5; CN113871970A

Abstract

A tap terminal having dual-point grounding, comprising a grounding cover (1) of which top is in an open state. An inverted stepped groove having the upper caliber larger than the lower caliber is formed in the grounding cover (1), a grounding spring (2) is provided at the inner bottom of the grounding cover (1); the grounding spring (2) is provided with a T-shaped columnar structure, and a grounding pad block (3) having a bottom end inserted into the grounding spring (2); and a grounding assembly is provided in the grounding cover (1) above the grounding pad block (3). Grounding is performed by means of the grounding cover (1), and dual-point grounding is achieved by means of the grounding assembly in the grounding cover (1), and when there is a problem in the grounding of the grounding cover (1), grounding can be performed by means of a grounding press cover (7) of the grounding assembly in the grounding cover (1), so as to ensure the safe and stable operation of the tap terminal and a high-voltage bushing.

Description

An end-screen terminal with double-point grounding

technical field

The invention relates to an end-screen terminal with double-point grounding, which belongs to the field of electrical components.

Background technique

Conventional high-voltage bushing end screen grounding terminals are grounded through the end screen grounding cover. When the end screen grounding cover is not installed in place, or the internal grounding parts of the end screen grounding cover are missing, the end screen grounding The grounding cover of the last screen is in virtual connection with the lead post of the last screen, which may easily cause the discharge breakdown accident of the last screen.

Contents of the invention

In order to solve the deficiencies of the prior art, the present invention provides a double-point grounding end screen terminal, which realizes double-point grounding through the grounding cover and the grounding components in the grounding cover, ensuring the safe and stable operation of the end screen terminal and the high-voltage bushing.

The technical scheme adopted in the present invention is:

An end-screen terminal with double-point grounding, including a grounding cover with an open top, an inverted stepped groove with an upper diameter larger than the lower diameter is formed inside the grounding cover, a grounding spring is arranged on the inner bottom of the grounding cover, and a grounding spring is provided on the grounding cover. There is a grounding block with a convex columnar structure and the bottom end is inserted into the grounding spring. A grounding component is arranged in the grounding cover above the grounding block. The grounding component includes a hollow inverted convex-shaped lead post, an insulating post and a terminal. The base and the top of the grounding gland are of a cylindrical structure with an open state. The lead post is inserted through the insulating post. The terminal seat is sleeved on the upper post of the insulating post. The support assembly with the bottom of the insulating column abutting, the lead post is inserted through the notch at the bottom of the ground gland and the support assembly is in contact with the inner bottom surface of the terminal base, the bottom end of the insulation column is inserted into the inside of the ground gland, and the top of the ground gland is in contact with the ground gland The bottom end of the terminal block abuts, and the lead post located under the ground gland is also provided with a support assembly for supporting and abutting against the bottom end of the ground gland. Insert the end into the sinking groove at the top of the grounding pad, the grounding cover is threadedly connected with the cylinder below the top of the terminal base and the top of the grounding cover abuts against the top and bottom of the terminal base.

Preferably, the support assembly includes a flat washer, a spring washer and a nut arranged on the lead post from top to bottom.

Further preferably, the lead post under the ground gland is also provided with a limit sealing ring, the bottom of the limit seal ring abuts against the inner step surface of the ground cover, and the top of the limit seal ring abuts against the ground gland, supporting The top of the assembly extends into the inner hole of the limit seal ring.

Further preferably, the top of the terminal seat is formed with a sinking groove for inserting the top of the insulating post, the top of the terminal seat is flush with the top of the insulating post, and a ring groove is opened on the outer edge of the top of the insulating post, and a sealing ring is arranged in the ring groove. Circle one.

Further preferably, the middle part of the top of the insulating post extends upwards to form a boss, and a sunken groove is provided on the top of the boss around the through hole where the lead post is inserted, and a sealing ring 2 is arranged in the sink.

Further preferably, an accommodating ring groove is provided on the cylinder below the top end of the terminal seat close to the top end of the terminal seat, and an annular slope structure is formed on the inner side of the top opening of the ground cover corresponding to the accommodating ring groove. A sealing ring three is arranged in the accommodation space formed by the structure and the accommodation ring groove.

The beneficial effects of the present invention are:

The double-point grounding end screen terminal can ensure the reliable grounding of the end screen. When any grounding point is abnormal, the other grounding point can ensure the reliable grounding of the end screen and improve the reliability of the end screen grounding; the reliability of the end screen grounding It can also ensure the operation reliability of the bushing on the transformer and improve the overall reliability of the transformer bushing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

The main reference signs in the figure have the following meanings:

1. Ground cover, 2. Ground spring, 3. Ground spacer, 4. Lead post, 5. Insulation post, 6. Terminal block, 7. Ground gland, 8. Flat washer, 9. Spring washer, 10. Nut , 11, limit seal ring, 12, seal ring one, 13, seal ring two, 14, seal ring three.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1: this embodiment is an end-screen terminal with two-point grounding, including a grounding cover 1 with an open top. Inside the grounding cover 1, an inverted stepped groove with an upper diameter larger than the lower one is formed. The inner bottom of 1 is provided with a grounding spring 2, and the grounding spring 2 is provided with a grounding block 3 that reaches a convex columnar structure and the bottom end is inserted into the grounding spring 2. A grounding block 3 is provided in the grounding cover 1 above the grounding block 3. Components, the grounding component includes a hollow inverted convex structure lead post 4, an insulating post 5, a terminal base 6 and a grounding cover 7 with a cylindrical structure with an open top, the lead post 4 is inserted through the insulating post 5, and the terminal base 6 Sleeved on the upper cylinder of the insulating column 5, in practical applications, the terminal base 6 is provided with an internal thread notch for connecting with the bushing flange, and the lead column 4 located below the insulating column 5 is sleeved for The support assembly that supports and abuts against the bottom of the insulating post 5, the lead post 4 passes through the notch at the bottom of the ground gland 7 and the support assembly abuts against the inner bottom surface of the terminal block 6, and the bottom end of the insulating post 5 is inserted into the ground gland 7 Inside, the top end of the ground gland 7 abuts against the bottom end of the terminal block 6, and the lead post 4 located below the ground gland 7 is also provided with a support assembly for supporting and abutting against the bottom end of the ground gland 7. The top of the grounding pad 3 is provided with a sinking groove, the bottom end of the lead post 4 is inserted into the sinking groove at the top of the grounding pad 3, the grounding cover 1 is screwed to the cylinder below the top of the terminal base 6 and the top of the grounding cover 1 is connected to the terminal base. The bottom of the top of 6 abuts.

Referring to FIG. 1 , the support assembly includes a flat washer 8 , a spring washer 9 and a nut 10 arranged on the lead post 4 from top to bottom.

Referring to Fig. 1, the lead post 4 under the ground gland 7 is also provided with a limit seal ring 11, the bottom of the limit seal ring 11 abuts against the inner step surface of the ground cover 1, and the top of the limit seal ring 11 Abutting against the ground gland 7 , the top of the support assembly extends into the inner hole of the limit sealing ring 11 .

Referring to Fig. 1, the top of the terminal base 6 is formed with a sinking groove for inserting the top of the insulating column 5, the top of the terminal base 6 is flush with the top of the insulating column 5 and a ring groove is opened on the outer edge of the top of the insulating column 5, A sealing ring 12 is arranged in the ring groove.

Referring to Fig. 1, the middle part of the top of the insulating column 5 extends upwards to form a boss, and a sinking groove for inserting the top of the lead post 4 is provided on the top of the boss around the through hole inserted into the lead post 4, and a sealing groove is arranged in the sinking groove. Circle two 13.

Referring to Fig. 1, on the cylinder below the top end of the terminal base 6, there is an accommodating ring groove close to the top end of the terminal base 6, and an annular slope structure is formed on the inner side of the top opening of the ground cover 1 corresponding to the accommodating ring groove , a sealing ring 3 14 is arranged in the accommodation space formed by the annular slope structure and the accommodation ring groove.

In actual installation, first set the sealing ring 2 13 on the lead post 4, then make the lead post 4 pass through the insulating post 5, the interference fit between the lead post 4 and the insulating post 5 and make the lead wire through the sealing ring 2 13 The top of the column is sealed with the top of the insulating column 5; then use the flat washer 8, spring washer 9, and nut 10 to fix the lead column 4 and the insulating column 5; then install the insulating column 5 on the terminal block 6, and the insulating column 5 and the terminal block 6 also adopts interference fit; then install the ground gland 7, the ground gland 7 passes through the lead post 2 and is installed on the bottom of the terminal base 6, and then uses the flat washer 8 and spring washer 9 to be set on the terminal post 4 and used The nut 10 is tightened on the terminal post 4 so that the ground gland 7 is fixed on the terminal post 4 and reliably contacts the bottom of the terminal base 6, and then the ground spring 2, the ground spacer 3 and the limiter are installed on the inner bottom of the ground cover 1. Position the sealing ring 11, then install the sealing ring 12 in the ring groove on the top of the terminal base 6 and install the sealing ring 3 14 in the accommodating ring groove, then install the terminal base 6 on the flange of the bushing, and put the sleeve The last screen lead wire of the tube is welded on the lead post 4, and finally the ground cover 1 is screwed tightly on the terminal base 6 post.

The above is only the preferred embodiment of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the patent of the present invention, some improvements and modifications can also be made. These improvements and Retouching should also be regarded as the protection scope of the patent of the present invention.

Claims

An end-screen terminal with double-point grounding, characterized in that it includes a grounding cover (1) with an open top, and an inverted stepped groove with an upper diameter larger than a lower diameter is formed inside the grounding cover (1). The inner bottom of (1) is provided with a grounding spring (2), and the grounding spring (2) is provided with a grounding block (3) that is a convex columnar structure and the bottom end is inserted into the grounding spring (2). A grounding component is arranged in the grounding cover (1) above the grounding spacer (3), and the grounding component includes a hollow lead post (4), an insulating post (5) and a terminal block (6) and A grounding gland (7) with a cylindrical structure with an open top, the lead post (4) passes through the insulating post (5), and the terminal base (6) is sleeved on the upper post of the insulating post (5) On the body, a support assembly for supporting and abutting against the bottom of the insulating post (5) is sleeved on the lead post (4) located below the insulating post (5), and the lead post (4) is inserted through the ground gland ( 7) The notch at the bottom and the support assembly are in contact with the inner bottom surface of the terminal block (6), the bottom end of the insulating column (5) is inserted into the inside of the ground gland (7), and the top end of the ground gland (7) is in contact with the terminal block The bottom end of (6) abuts, and the lead post (4) located under the ground gland (7) is also provided with a support assembly for supporting and abutting against the bottom end of the ground gland (7). 3) is provided with a sinking groove at the top, and the bottom end of the lead post (4) is inserted into the sinking groove at the top of the ground pad (3), and the ground cover (1) is threadedly connected to the cylinder below the top of the terminal base (6) and The top of the ground cover (1) abuts against the bottom of the top of the terminal base (6).
The end-screen terminal with double-point grounding according to claim 1, characterized in that, the support assembly includes a flat washer (8) and a spring washer (9) arranged on the lead post (4) from top to bottom ) and nuts (10).
An end screen terminal with double-point grounding according to claim 1 or 2, characterized in that the lead post (4) under the ground gland (7) is also provided with a limit sealing ring (11), the The bottom of the limit sealing ring (11) abuts against the step surface of the inner step of the grounding cover (1), the top of the limit sealing ring (11) abuts against the ground gland (7), and the top of the support assembly extends to the limit In the inner hole of the sealing ring (11).
The end-screen terminal with double-point grounding according to claim 1, characterized in that, the top of the terminal base (6) is formed with a sunken groove for inserting the top of the insulating column (5), and the terminal base (6) The top of the top is flush with the top of the insulating column (5) and an annular groove is provided on the outer edge of the top of the insulating column (5), and a sealing ring one (12) is arranged in the annular groove.
The end-screen terminal with double-point grounding according to claim 4, characterized in that, the middle part of the top of the insulating post (5) extends upwards to form a boss, and is inserted around the lead post (4) at the top of the boss The through hole is provided with a sinking groove for inserting the top of the lead column (4), and a sealing ring two (13) is arranged in the sinking groove.
The end-screen terminal with double-point grounding according to claim 1, characterized in that an accommodating ring groove is opened on the cylinder below the top end of the terminal seat (6) close to the top end of the terminal seat (6). An annular slope structure is formed on the inner side of the top opening of the ground cover (1) corresponding to the accommodation ring groove, and a sealing ring three (14) is arranged in the accommodation space formed by the annular slope structure and the accommodation ring groove.