CN103681018B - A kind of buffer unit preventing high voltage ground switch induction discharge - Google Patents

Abstract

The invention discloses a buffer device for preventing inductive discharge of a high-voltage grounding switch, comprising a bent plate and a U-shaped bent plate, the bent plate and the U-shaped bent plate are connected by a plurality of pins, a compression spring is arranged on the pin, and the two ends of the compressed spring are They are respectively fixed to the bent plate and the U-shaped bent plate, and a grounding copper wire with a protective sheath is also connected between the bent plate and the U-shaped bent plate. The invention can ensure that the high-voltage grounding switch has proper buffering and reliable contact when the switch is opened, and can effectively avoid the occurrence of discharge phenomenon at the same time. The cushioning device of the present invention is integrated with the grounding switch and the support to ensure proper cushioning force while avoiding induction discharge, and completely solve the phenomenon of grounding tool bar discharge caused by floating potential in UHV electric field.

Description

A buffer device for preventing inductive discharge of high-voltage grounding switch

technical field

The invention belongs to the technical field of high-voltage grounding switches, and in particular relates to a buffer device for preventing inductive discharge of a high-voltage grounding switch.

Background technique

With the rapid development of my country's economy and society, people's demand for electricity has also increased sharply. The scale of power grid and power generation construction has continued to increase, and higher and better requirements have been put forward for power equipment. Therefore, 750kV transmission lines in the Northwest Start large-scale construction. With the construction of the 750kV transmission network of the Northwest Power Grid, the density of 750kV transmission lines is increasing, and double-circuit lines on the same tower need to be erected. The induction phenomenon between these overhead transmission lines is very obvious. Therefore, it is required that the corresponding transmission line grounding switch must have opening and closing induction. current capability.

The 800kV grounding switch with the ability to open and close strong induced current can completely break the corresponding induced current and voltage through the additional auxiliary equipment (circuit breaker) when closing, but when the grounding switch is opened, the grounding switch and the ground knife support Direct contact is likely to cause insufficient contact pressure between the grounding switch and the bracket and rebound. The rebound will cause a virtual connection between the grounding switch and the bracket to generate a floating potential. Affected by the induced voltage on site, a discharge phenomenon will occur, which will not only cause damage to the grounding switch, but also cause unsafe factors in the site operation.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a buffer device for preventing the induction discharge of the high-voltage earthing switch, which can ensure that the high-voltage earthing switch has a suitable buffer and reliable contact when it is opened Can effectively avoid the occurrence of discharge phenomenon.

The present invention is realized through the following technical solutions:

A buffer device for preventing inductive discharge of a high-voltage grounding switch, including a bent plate installed on a bracket and a U-shaped bent plate in contact with the grounding switch. The bent plate and the U-shaped bent plate are connected by several pins, and a compression spring is arranged on the pins , the two ends of the compression spring are respectively fixed with the bent plate and the U-shaped bent plate, and a grounding copper wire with a protective sleeve is also connected between the bent plate and the U-shaped bent plate.

A flange bearing is arranged between the pin and the compression spring, and the pin extends into the bent plate through the flange bearing.

The number of the flange bearings is 2, which are respectively arranged at the two ends of the compression spring.

The flange bearing described is an insulated oil-free bearing.

The U-shaped bent plate is made of aluminum.

The lower end of the pin is provided with double nuts for adjusting the tightness of the compression spring.

Mounting holes for connecting brackets are opened on the bent plate.

The mounting holes are elongated.

Compared with the prior art, the present invention has the following beneficial technical effects:

The invention includes a bent plate used to connect the bracket and a U-shaped bent plate in contact with the grounding switch. The bent plate and the U-shaped bent plate are connected by a pin, and a compression spring is arranged on the pin. When the grounding switch is opened, the grounding switch and the U-shaped Bending plate contact, relying on the support of compression springs can ensure that the grounding switch has a suitable buffer when it is closed, and ensure that the grounding switch always maintains a certain pressure after contacting the U-shaped curved plate, avoiding false connection and causing floating potential, so that the grounding switch can be disconnected. There is a proper buffer and reliable contact when the switch is turned on; at the same time, a grounding copper wire with a protective sleeve is connected between the bent plate and the U-shaped bent plate, which makes the grounding more reliable when the grounding switch is opened, thus ensuring reliable grounding. flow. The cushioning device of the present invention is integrated with the grounding switch and the support to ensure proper cushioning force while avoiding induction discharge, and completely solve the discharge phenomenon of the grounding tool bar caused by the floating potential of the UHV electric field.

Further, in the present invention, a flange bearing is arranged between the pin and the compression spring, and the pin passes through the flange bearing and extends into the bent plate. The flange bearing is an insulating oil-free bearing, which can ensure the insulation between the pin and the spring. , to avoid compression spring shunt caused by induced current.

Furthermore, the lower end of the pin (the end passing through the bent plate) is provided with double nuts for adjusting the tightness of the compression spring. The adjustment nut can conveniently control the working stroke of the compression spring, adjust the force of the spring, and ensure that there is no leakage when the grounding switch is opened. Rebound, to ensure that the grounding switch has a suitable buffer force after opening.

Furthermore, the bent plate of the present invention is provided with installation holes for connecting the brackets, and the installation holes are designed as elongated strips, which is convenient for height adjustment during installation.

Description of drawings

Fig. 1 is a structural front view of the present invention;

Fig. 2 is a structural top view of the present invention;

Fig. 3 is a schematic diagram of the assembly structure of the pin and the flange bearing of the present invention.

Among them, 1 is a bent plate; 2 is a pin; 3 is a compression spring; 4 is a flange bearing; 5 is a U-shaped bent plate; 6 is a grounding copper wire; 7 is a mounting hole; 8 is a double nut.

detailed description

The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

Referring to Fig. 1 and Fig. 2, the present invention includes a bent plate 1 for installation with a bracket, and a long strip-shaped mounting hole 7 is opened on the bent plate, which is convenient for installation and adjustment of the installation height, and also includes a U-shaped bend in contact with the grounding switch The plate 5 and the U-shaped bent plate 5 are made of aluminum; the bent plate 1 and the U-shaped bent plate 5 are connected by two pins 2, and the pins 2 pass through the U-shaped bent plate, and the hexagonal ends of the pins sink into the In the U-shaped curved plate 5, it is convenient to fasten during installation. The smooth shaft exposed after the pin 2 passes through the U-shaped curved plate 5 is provided with a compression spring 3, and the two ends of the compressed spring are connected to the curved plate 1 and the U-shaped curved plate 5 respectively. Fixed; the other end of the pin 2 passes through the bent plate 1 and is fastened with double nuts 8. Adjusting the double nuts 8 can conveniently control the working stroke of the compression spring 3 and adjust the force of the compression spring 3. The bending plate 1 and the U-shaped bending plate 5 are also connected by a grounding copper wire 6 with a protective sheath, which can ensure reliable grounding flow.

Referring to Fig. 3, a flange bearing 4 is arranged at both ends of the compression spring 3 respectively, and the flange bearing 4 is made of oil-free bearing material, and the number of the flange bearing 4 is 2, which are respectively arranged at the compression spring 3. At both ends of the spring 3, the pin 2 can pass through the two flange bearings respectively fixed on the upper and lower ends of the compression spring 3 and extend into the bent plate 1, which can ensure the insulation between the pin 2 and the compression spring 3, and avoid The induced current causes the compression spring 3 to shunt.

The buffer device for preventing the induction discharge of the high-voltage grounding switch of the present invention, when working:

The upper end of the compression spring 3 supports the U-shaped bent plate 5, and the U-shaped bent plate 5 is in contact with the grounding switch when the grounding switch is opened. The support of the compression spring 3 can ensure that the grounding switch has a suitable buffer when the grounding switch is closed, ensuring that the grounding switch Always maintain a certain pressure after contacting with the U-shaped bent plate 5, so as to avoid floating potential due to false connection. When the grounding switch is opened, the grounding switch, the U-shaped bent plate 5, the grounding copper wire 6, the bent plate 1 and the support are connected into one body, thereby avoiding induction discharge.

Claims (7)

1. A buffer device for preventing inductive discharge of a high-voltage grounding switch, characterized in that it comprises a bent plate (1) mounted on the bracket and a U-shaped bent plate (5) in contact with the grounding switch, the bent plate (1) and the U-shaped bent plate (1) The shaped bent plate (5) is connected by several pins (2), and a compression spring (3) is arranged on the pin (2), and the two ends of the compressed spring are respectively fixed with the bent plate (1) and the U-shaped bent plate (5). A grounding copper wire (6) with a protective sleeve is also connected between the bent plate (1) and the U-shaped bent plate (5); a flange bearing (4) is arranged between the pin (2) and the compression spring (3) ), the pin (2) passes through the flange bearing (4) and extends into the bent plate (1). 2. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to claim 1, characterized in that the number of the flange bearings (4) is two, which are respectively arranged at both ends of the compression spring (3) . 3. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to claim 1, characterized in that the flange bearing (4) is an insulating oil-free bearing. 4. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to claim 1, wherein the U-shaped bent plate (5) is made of aluminum. 5. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to any one of claims 1 to 4, characterized in that, the lower end of the pin (2) is provided with a spring for adjusting the tightness of the compression spring (3). Double nuts (8). 6. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to any one of claims 1 to 4, characterized in that, the curved plate (1) is provided with a mounting hole (7) for connecting the bracket . 7. A buffer device for preventing inductive discharge of a high-voltage grounding switch according to claim 6, characterized in that the mounting hole (7) is elongated.