CN210142546U

CN210142546U - DC grounding electrode circuit arcing angle with self-arc-extinguishing function

Info

Publication number: CN210142546U
Application number: CN201921489274.6U
Authority: CN
Inventors: 雷潇; 张星海; 范松海; 崔涛; 曾宏
Original assignee: Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
Current assignee: Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-03-13
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses an area is from putting out arc function's direct current earthing pole circuit and is beckoned arc angle, beckoned arc angle includes: an upper electrode and a lower electrode; the upper electrode and the lower electrode each include: the head end is connected with a hardware fitting, a nonlinear resistance unit and a V-shaped tail electrode; the connecting hardware fittings at the respective head ends of the upper electrode and the lower electrode are respectively used for connecting the metal parts at the end parts of the corresponding insulators and the respective nonlinear resistor units; the tail ends of the respective nonlinear resistance units are respectively connected with the respective V-shaped tail electrodes, so that the problem that the arcing angle is damaged under the action of the subsequent direct current arc due to lightning breakdown is solved.

Description

DC grounding electrode circuit arcing angle with self-arc-extinguishing function

Technical Field

The utility model relates to an earthing pole circuit safety protection field specifically, relates to an arc angle is beckoned to area from direct current earthing pole circuit of function of putting out an arc.

Background

The grounding electrode line is an important component of a high-voltage direct-current transmission system and mainly plays a role in providing a through-current path for system operation current during monopolar operation or bipolar unbalanced operation. In order to avoid the damage of lightning strike to the earth pole line insulator, arc striking angles are generally connected in parallel on the insulator string. Such arcing horn is a metal member whose air gap distance is determined according to the insulating cooperation of the grounding electrode circuit by the following main principles: the overvoltage generated on the grounding polar line after the DC system fault can be resisted. The principle can ensure that the grounding electrode line insulation does not flashover when in fault or overvoltage operation in a bipolar operation mode, and avoid high-amplitude direct current follow current which is generated concomitantly. If the grounding electrode circuit works in a single-pole ground loop operation mode, the grounding electrode circuit flows large current, and the grounding electrode circuit is struck by lightning under the condition, and high-amplitude direct current follow current also flows after lightning flashover of an arcing angle. In such a case, the improvement of the insulation strength by merely increasing the arcing angle gap length cannot satisfy the technical and economical requirements. In view of the above, there is a need for a striking angle with a self-extinguishing function.

SUMMERY OF THE UTILITY MODEL

The utility model provides an area is from going out direct current earthing pole circuit of arc function and is beckoned the arc angle, solves and beckoned the problem that the arc angle damaged under the follow-up direct current electric arc effect of thunder and lightning puncture.

The purpose of the utility model is realized through the following technical scheme: a direct current grounding electrode circuit arcing horn with a self-arc-extinguishing function comprises an upper electrode and a lower electrode. The upper electrode and the lower electrode respectively comprise a head end connecting hardware fitting, a nonlinear resistance unit and a V-shaped tail electrode. The head end connecting hardware fitting is used for connecting the end metal part of the insulator and the nonlinear resistor unit. The tail end of the nonlinear resistance unit is connected with the claw-shaped tail electrode. The nonlinear resistance unit has smaller resistance when a large current flows, but is still larger than the resistance of the grounding electrode line, and the resistance of the nonlinear resistance unit is rapidly increased along with the reduction of the current, so that the direct current arc after overvoltage breakdown can be rapidly turned off.

Further, the standard operation impact withstand voltage of the arcing angle is larger than the operation impact residual voltage of the lightning arrester of the grounding electrode lead in the converter station.

Furthermore, the standard lightning impulse volt-second characteristic of the arcing angle is 15% lower than that of 5 insulators, and the structural height of the insulator is 170 cm.

Further, the nonlinear resistor of the nonlinear resistor unit is a zinc oxide material.

Further, the nonlinear resistance unit has a silicone rubber outer jacket.

Further, the sum of residual voltages of the nonlinear resistance units of the upper electrode and the lower electrode under 5kA lightning impulse is larger than 6 omega.

Further, the lightning impulse discharge capacity of the arcing angle is larger than 1.6 ℃.

Furthermore, the V-shaped tail electrode is made of galvanized steel.

Furthermore, the side surface of the V-shaped tail electrode is V-shaped, the part close to the insulator string extends obliquely downwards, and the part far away from the insulator string extends obliquely upwards. And the included angle between the part far away from the insulator and the radial direction of the insulator string is 45 +/-5 degrees.

Further, the length of the V-shaped tail electrode far away from the insulator part is more than 20 cm.

The utility model has the advantages that:

(1) the utility model discloses can make direct current ground connection circuit not puncture under system's event overvoltage.

(2) The direct current arc of the direct current grounding circuit after breakdown under the lightning overvoltage can be rapidly extinguished.

(3) The utility model discloses a V font electrode, electric arc extinguishes more easily.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;

fig. 1 is a schematic structural diagram of an arc striking angle of a dc ground electrode line with a self-arc-quenching function in the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and the scope of the present invention is not limited by the specific embodiments disclosed below.

Referring to fig. 1, the present application provides a dc grounding electrode circuit arcing horn with a self-extinguishing function, which includes an upper electrode and a lower electrode; the upper electrode includes: the first head end is connected with a hardware fitting 1, a first nonlinear resistance unit 3 and a first V-shaped tail electrode 5; the lower electrode includes: the second head end is connected with the hardware fitting 2, the second nonlinear resistance unit 4 and the second V-shaped tail electrode 6;

one end of the first head end connecting hardware fitting is connected with the end metal part of the insulator, and the other end of the first head end connecting hardware fitting is connected with the head end of the first nonlinear resistance unit; the tail end of the first nonlinear resistance unit is connected with the first V-shaped tail electrode;

one end of the second head end connecting hardware fitting is connected with the end metal part of the insulator, and the other end of the second head end connecting hardware fitting is connected with the head end of the second nonlinear resistance unit; the tail end of the second nonlinear resistance unit is connected with a second V-shaped tail electrode;

the first head end connecting hardware fitting and the second head end connecting hardware fitting are identical in shape and structure, the first nonlinear resistance unit and the second nonlinear resistance unit are identical, the first V-shaped tail electrode and the second V-shaped tail electrode are identical in structure, and the first V-shaped tail electrode and the second V-shaped tail electrode are symmetrical in the vertical direction about a horizontal center line between the first V-shaped tail electrode and the second V-shaped tail electrode.

In the embodiment of the application, the standard operation impact withstand voltage of the arcing horn is greater than the operation impact residual voltage of the lightning arrester of the grounding electrode lead in the converter station.

In the embodiment of the application, the standard lightning impulse volt-second characteristic of the arcing angle is 15% lower than that of 5 insulators, and the structural height of the insulator is 170 cm.

In the embodiment of the present application, the nonlinear resistors of the first and second

nonlinear resistor units

3 and 4 are made of zinc oxide materials.

In the embodiment of the present application, the first nonlinear resistance unit 3 and the second nonlinear resistance unit 4 have silicon rubber casings.

In the embodiment of the application, the sum of residual voltages of the first nonlinear resistance unit 3 and the second nonlinear resistance unit 4 of the upper electrode and the lower electrode under 5kA lightning impulse is larger than 6 Ω.

In the embodiment of the application, the lightning impulse discharge capacity of the arcing angle is more than 1.6C.

In the embodiment of the present application, the first V-shaped tail electrode 5 and the second V-shaped tail electrode 6 are made of galvanized steel.

Furthermore, the side surfaces of the first V-shaped tail electrode 5 and the second V-shaped tail electrode 6 are V-shaped, the part close to the insulator string extends obliquely downwards, the part far away from the insulator string extends obliquely upwards, and the included angle α between the part far away from the insulator and the insulator string in the radial direction is 45 degrees +/-5 degrees.

Further, the lengths of the first V-shaped tail electrode 5 and the second V-shaped tail electrode 6 far away from the insulator part are more than 20 cm.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides an arc angle is beckoned to DC earthing pole circuit of function from putting out arc in area, its characterized in that, arc angle includes:

an upper electrode and a lower electrode; the upper electrode and the lower electrode each include: the head end is connected with a hardware fitting, a nonlinear resistance unit and a V-shaped tail electrode; the connecting hardware fittings at the respective head ends of the upper electrode and the lower electrode are respectively used for connecting the metal parts at the end parts of the corresponding insulators and the respective nonlinear resistor units; the tail ends of the respective nonlinear resistance units are respectively connected with the respective V-shaped tail electrodes.

2. The direct current grounding electrode line arcing horn with the self-extinguishing function according to claim 1, wherein a standard operating impact withstand voltage of the arcing horn is greater than an operating impact residual voltage of a grounding electrode lead arrester in the converter station.

3. The direct current grounding electrode line arc catching angle with the self-arc extinguishing function as claimed in claim 1, wherein the standard lightning impulse volt-second characteristic of the arc catching angle is lower than that of 5 insulators by 15%, and the height of the insulator structure is 170 cm.

4. The direct current grounding electrode circuit arcing horn with the self-extinguishing function according to claim 1, wherein the nonlinear resistor of the nonlinear resistor unit is a zinc oxide material.

5. The dc ground electrode circuit arcing horn with self-extinguishing function according to claim 1, wherein the non-linear resistance unit has a silicone rubber outer casing.

6. The arc striking angle of a DC grounding electrode with self-extinguishing function of claim 1, wherein the sum of residual voltages of the non-linear resistance units of the upper and lower electrodes under 5kA lightning impulse is greater than 6 Ω.

7. The direct current grounding electrode circuit arcing horn with the self-extinguishing function according to claim 1, wherein the lightning impulse discharge capacity of the arcing horn is greater than 1.6C.

8. The direct current grounding electrode circuit arcing horn with the self-extinguishing function according to claim 1, wherein the V-shaped tail electrode is made of galvanized steel.

9. The direct-current grounding electrode circuit arcing horn with the self-extinguishing function according to claim 1, wherein a portion, close to the insulator string, of the V-shaped tail electrode in the upper electrode extends obliquely upward, a portion, far away from the insulator string, extends obliquely upward, and an included angle between the portion far away from the insulator and the radial direction of the insulator string is 45 ° ± 5 °; the V-shaped tail electrode in the lower electrode extends obliquely downwards at the part close to the insulator string and extends obliquely downwards at the part far away from the insulator string, and the included angle between the part far away from the insulator and the insulator string in the radial direction is 45 +/-5 degrees.

10. The dc ground electrode circuit arcing horn with self-extinguishing function according to claim 1, wherein the length of the V-shaped tail electrode away from the insulator portion is greater than 20 cm.