CN102522252A - Fracture structure of a non-SF6 gas-insulated metal-enclosed isolating switch - Google Patents

Abstract

The invention discloses a fracture structure of a non-SF ₆ gas-insulated metal-enclosed isolating switch, which includes a moving-side shielding cover, a static-side shielding cover, a moving contact seat and a static contact seat; the moving-side shielding cover is installed on the moving contact seat , The static side shield is installed on the static contact seat; at least one side is provided with a ring magnet between the dynamic side shield and the movable contact seat and between the static side shield and the static contact seat. The existence of the longitudinal magnetic field can significantly weaken the ablation effect of the arc. Therefore, under the _condition of low-speed opening and closing, although the arc ablation time increases, the requirements of the opening and closing current can also be met by reducing the arc ablation intensity; A ring magnet is added to the fracture of the gas insulated switchgear, so as to realize the magnetic blowing effect when switching the current and reduce the ablation effect of the arc on the contact; the ring magnet is placed between the shield cover and the moving contact seat, And between the shield cover and the static contact seat, it effectively overcomes the phenomenon that the magnet is easy to lose magnetism under impact and high temperature conditions.

Description

Fracture structure of a non-SF6 gas-insulated metal-enclosed isolating switch

technical field

The invention relates to the technical field of high-voltage electrical appliances, in particular to a fracture structure of a non-SF ₆ gas-insulated metal-enclosed isolating switch.

Background technique

Non-SF ₆ gas-insulated metal-enclosed switchgear has weak gas arc extinguishing and insulation capabilities. In order to meet the widely used double-bus substation wiring method, it is necessary to develop non-SF ₆ gas-insulated disconnectors with the ability to open and close the bus to convert current.

Due to the weak arc extinguishing and insulation capabilities of non-SF ₆ gases, it is usually necessary to use high-speed switching to realize the switching function of busbar conversion current. High-speed isolating switches have high cost and low mechanical reliability. Therefore, it is very necessary to develop a Low-speed reliable isolating switch similar to that in SF ₆ gas.

Contents of the invention

The object of the present invention is to provide a non-SF ₆ gas-insulated metal-enclosed disconnector fracture structure to solve the above technical problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

A fracture structure of a non-SF ₆ gas-insulated metal-enclosed isolating switch, including a moving side shield, a static side shield, a moving contact seat and a static contact seat; the moving side shield is installed on the moving contact seat, and the static side The shielding cover is installed on the static contact seat; ring magnets are arranged on at least one side between the moving side shielding cover and the moving contact seat and between the static side shielding cover and the static contact seat.

The further improvement of the present invention is: the movable contact seat is provided with a hole for the movable contact to pass through, and the hole is provided with an annular contact finger; the movable contact is installed in the hole and passes through the annular contact finger and the movable contact seat. electrical connection.

The further improvement of the present invention lies in that: the end of the moving contact is provided with an arcing contact.

The further improvement of the present invention lies in that the arcing contact is fixedly connected to the static contact seat.

The further improvement of the present invention lies in that ring magnets are arranged between the moving side shield and the moving contact seat and between the static side shield and the static contact seat.

A further improvement of the present invention is that: the ring magnet forms a longitudinal magnetic field at the port.

The further improvement of the present invention is that: the moving side shield, the static side shield, the moving contact seat and the static contact seat are installed in a closed casing, and the casing is filled with compressed non-SF ₆ gas.

Compared with the prior art, the present invention has the following advantages: the existence of the longitudinal magnetic field can significantly weaken the ablation effect of the arc, so under the condition of low-speed opening and closing, although the arc ablation time increases, it can also meet the requirements by reducing the arc ablation intensity. Opening and closing current requirements; the present invention adds a ring magnet to the fracture of the original SF ₆ gas insulated switchgear, thereby realizing the magnetic blowing effect during the opening and closing current and reducing the ablation effect of the arc on the contacts. The invention places the ring magnet between the shield cover and the moving contact seat, and between the shield cover and the static contact seat, effectively overcoming the phenomenon that the magnet is easy to lose magnetism under impact and high temperature conditions. Therefore, the present invention has the characteristics of "low cost, high efficiency and high reliability".

Description of drawings

Fig. 1 is a kind of typical fracture schematic diagram of the present invention;

Among them: 1. Shielding cover 2. Ring magnet 3. Moving contact 4. Arcing contact 5. Moving contact seat 6. Arcing contact 7. Static contact seat 8. Ring contact finger.

Detailed ways

The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1, it is a typical fracture of the present invention, mainly including: shielding cover 1, ring magnet 2, moving contact 3, arcing contact 4, moving contact seat 5, arcing contact 6, static contact Head seat 7, annular contact finger 8.

The annular contact finger 8 is first placed in the annular groove of the moving contact seat 5 and the static contact seat 7, so that the moving contact 3 with the arc contact 4 at the end can move left and right in the moving contact seat 5, and through The annular contact finger 8 realizes the circuit connection between the movable contact 3 and the movable contact seat 5 .

The ring magnet 2 is first fixed on the moving contact seat 5 and the static contact seat 7, and then the shielding case 1 is installed respectively.

The arcing contact 6 is fastened on the static contact seat 7 by threads.

The fracture structure is the same as the ordinary fracture in the application process of the disconnector. After the static side and the dynamic side are corrected by centering, the moving contact 3 can be guaranteed to move between the moving contact seat 5 and the static contact seat 7, realizing Disconnection and connection of circuits on both sides of the fracture.

The existence of the longitudinal magnetic field can significantly weaken the ablation effect of the arc. Therefore, under the condition of low-speed opening and closing, although the arc ablation time increases, the requirements of the opening and closing current can also be met by reducing the arc ablation intensity; The shielding cover can optimize the distribution of the electric field in the fracture; the ring magnet can provide the longitudinal magnetic field between the fractures; the end of the moving contact is equipped with an arc contact that is resistant to arc ablation.

The arc extinguishing ability of the air itself is weak, and the isolating switch generates an arc between the fractures. The effect of the longitudinal magnetic field prevents the arc from forming spots and avoids the concentration of spots, that is, increasing the ablation area of the arc. The purpose of not forming arc spots is to reduce the contact loss The degree of ablation also plays a role in prolonging the electrical life.

The present invention adds a ring magnet to the fracture of the original SF ₆ gas insulated switchgear, thereby realizing the magnetic blowing effect when the current is switched, and reducing the ablation effect of the arc on the contact. The invention places the ring magnet between the shield cover and the moving contact seat, and between the shield cover and the static contact seat, effectively overcoming the phenomenon that the magnet is easy to lose magnetism under impact and high temperature conditions. Therefore, the present invention has the characteristics of "low cost, high efficiency and high reliability".

Claims (7)

1. non-SF ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, comprises moving side radome, quiet side radome, movable contact headstock (5) and stationary contact headstock (7); Moving side radome is installed on the movable contact headstock (5), and quiet side radome is installed on the stationary contact headstock (7); At least one side is provided with annular magnet (2) between moving side radome and the movable contact headstock (5) and between quiet side radome and the stationary contact headstock (7).

2. a kind of non-SF according to claim 1 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, is provided with the hole that supplies moving contact (3) to pass in the movable contact headstock (5), is provided with annular fingertip (8) in this hole; Moving contact (3) is installed in this hole and through annular fingertip (8) and is electrically connected with movable contact headstock (5).

3. a kind of non-SF according to claim 2 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, the end of moving contact (3) is provided with arcing contact (4).

4. a kind of non-SF according to claim 1 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, is fixedly connected with striking contact (6) on the stationary contact headstock (7).

5. a kind of non-SF according to claim 1 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, between moving side radome and the movable contact headstock (5) and be equipped with annular magnet (2) between quiet side radome and the stationary contact headstock (7).

6. a kind of non-SF according to claim 1 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, said annular magnet (2) forms longitudinal magnetic field in the port.

7. according to each described a kind of non-SF in the claim 1 to 6 ₆The fracture texture of gas-insulated metal-enclosed isolating switch is characterized in that, moving side radome, quiet side radome, movable contact headstock (5) and stationary contact headstock (7) are installed in the closed shell, is filled with the non-SF of compression in this housing ₆Gas.

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