CN204668040U - 10kV insulated cable overvoltage protection lightning arrester - Google Patents

Abstract

The utility model relates to a 10kV insulated cable overvoltage protection lightning arrester, which comprises an umbrella-skirt oxide lightning arrester, one end of a mounting plate is fixed on the bottom of the lightning arrester through a lightning arrester mounting nut, and the other end of the mounting plate is fixed on the insulator through an insulator mounting nut At the bottom of the arrester, the long arm end of the current limiting ring is fixed by the current limiting ring mounting nut on the top of the arrester. The circular draining ring end of the current limiting ring is coaxially sleeved on the outside of the insulator, wherein the current limiting ring It further includes the long arm on the right side of the current limiting ring, a mounting hole is formed on the right end of the long arm, a circular drainage ring with a left opening is welded at the left end of the long arm, and two ends of the opening on the left side of the drainage ring are formed with two Arc-shaped elbows with side bends. The utility model can reduce the lightning impact residual voltage, reduce the pressure of the load test of the current limiting element, and ensure the normal operation of the circuit.

Description

10kV Insulated Cable Overvoltage Protection Surge Arrester

technical field

The utility model belongs to the technical field of power cable protection equipment, in particular to a 10kV insulated cable overvoltage protection lightning arrester.

Background technique

At present, after the overhead insulated cables are used in the urban distribution network, the disconnection accidents caused by lightning damage are relatively increased. The installation of overvoltage protection arresters can solve the problem of lightning disconnection. The current limiting element of the line overvoltage protector is connected in parallel with the line insulator. When the lightning strikes the tower pole or the lightning conductor, the high potential caused by the lightning current makes the series gap of the line protector act, reducing the potential difference between the tower arm and the wire. Ensure that the insulator will no longer flash over, thereby avoiding line tripping and power failure. After the series gap action, the residual voltage of the current limiting element body is not only limited to be far lower than the flashover voltage in the dry insulator, but also can automatically extinguish the power frequency freewheeling current under the power frequency voltage of the system after the lightning voltage, ensuring normal power supply . At present, the structure of the overvoltage protection arrester for 10kV insulated cables is complex, such as the gap shape of the claw, and the discharge is uneven; the insulation pillar type needs to be pierced to connect with clamps, which destroys the insulation of the cable. This 10kV insulated cable overvoltage protection surge arrester is based on the ordinary surge arrester, and a special structure of the diversion ring is added to complete the transformation of the cable overvoltage protection without destroying the original cable and line structure.

Contents of the invention

The purpose of this utility model is to propose a 10kV insulated cable overvoltage protection lightning arrester for the deficiencies of the prior art.

The utility model solves its technical problem and realizes by taking the following technical solutions:

A 10kV insulated cable overvoltage protection surge arrester, including an umbrella skirt oxide arrester, one end of the mounting plate is fixed at the bottom of the arrester through the arrester mounting nut, and the other end of the mounting plate is fixed to the bottom of the insulator through the insulator mounting nut, At the top of the arrester, the long arm end of the current limiting ring is fixed by the current limiting ring mounting nut, and the circular diversion ring end of the current limiting ring is coaxially sleeved on the outside of the insulator.

Wherein, the current limiting ring further includes a long arm on the right side of the current limiting ring, a mounting hole is formed on the right end of the long arm, a circular drainage ring with a left opening is welded on the left end of the long arm, and a circular drainage ring with a left opening is welded on the left side of the long arm. The two ends of the opening are shaped with arc-shaped elbows that turn to both sides.

Moreover, the circular collar is inserted between the second and third sheds of the insulator from top to bottom, and the distance between the plane where the circular collar is located and the cable of the insulator is 50±5mm.

Advantage and positive effect of the present utility model are:

1. When the line is in normal operation, the overvoltage protector of the utility model does not bear the effect of continuous power frequency working voltage, and the charge rate of the resistance valve plate of the current limiting element in the "rest" state can be higher, and the residual voltage of lightning impact can be reduced. Then lower.

2. The current-limiting element is only in the working state after the series gap action under the action of a certain amplitude of lightning overvoltage, the current-limiting element body is in the working state, so its external insulation level (creepage distance of the insulating jacket) can be lower than that of the non-gap arrester.

3. On the normally designed circuit, there is enough ability to withstand the operating overvoltage, and the size of the gap can be selected to avoid the action of the operating overvoltage, which can greatly reduce the pressure of the current-limiting element action load test.

4. Due to the isolation effect of the series gap of the stainless steel drainage ring, even if the resistor sheet of the current limiting element deteriorates, it will not affect the normal operation of the line.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a top view of the current limiting ring in the utility model;

Fig. 3 is a top view of the mounting plate in the utility model.

Detailed ways

The implementation of the utility model will be described in further detail below in conjunction with the accompanying drawings. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the utility model.

A 10kV insulated cable overvoltage protection surge arrester, as shown in Figure 1, includes an umbrella skirt oxide arrester 2, one end of the mounting plate 3 is fixed at the bottom end of the arrester through the arrester mounting nut 4, and the other end of the mounting plate is passed through the insulator The mounting nut 5 is fixed on the bottom end of the insulator 6, and the long arm end of the current limiting ring 7 is fixed by the current limiting ring mounting nut 1 on the top of the arrester. outside,

Wherein, as shown in FIG. 2 , the current limiting ring further includes a long arm 10 on the right side of the current limiting ring, a mounting hole 11 is formed on the right end of the long arm, and a circular drain with a left opening is welded on the left end of the long arm. Ring 9 is shaped on the two ends of the opening on the left side of the drainage ring to the arc-shaped elbow 8 that bends to both sides.

In the specific implementation of the utility model, the circular collar is placed between the second and third sheds of the insulator from top to bottom, and the distance between the plane where the circular collar is located and the cable of the insulator is 50±5mm.

In the specific implementation of the utility model, as shown in FIG. 3 , the mounting plate is a strip-shaped metal plate formed with a left mounting hole 12 and a right mounting hole 13 .

Claims (2)

1. a 10kV insulated cable overvoltage protection lightning arrester; it is characterized in that: comprise full skirt shape Oxide Arrester; one end of mounting panel is fixedly mounted with by lightning arrester mounting nuts in the bottom of lightning arrester; the other end of mounting panel is fixed on the bottom of insulator by insulator mounting nuts; on the top of lightning arrester by the long-armed termination of restrictor ring mounting nuts set current limiting ring; the circular drainage ring end of restrictor ring and insulator coaxial sleeve are in the outside of insulator

Wherein, described restrictor ring comprises on the right side of restrictor ring long-armed further, is shaped with installing hole in long-armed right end, and be welded with the circular drainage ring of left side opening at long-armed left end, the opening two ends on the left of draining ring are shaped with the circular arc elbow curved to both sides.

2. 10kV insulated cable overvoltage protection lightning arrester according to claim 1; it is characterized in that: described circular ring is enclosed within insulator second and the 3rd between full skirt of number from top to bottom, and the distance of circular ring place plane and insulator cable is 50 ± 5mm.