CN104201568A - Fixed gap overvoltage protector - Google Patents

Abstract

The invention discloses a fixed-gap overvoltage protector and relates to insulation equipment for the overvoltage protector. The present invention consists of an upper electrode, a resistance sheet, a middle electrode and an insulator which are sequentially connected from top to bottom. Sliding on the bracket, there is an insert built into the top of the insulator, which is wide at the top and narrow at the bottom. The upper part of the insert is cylindrical, and the lower part is multi-faceted columnar. The inner wall of the counterbore is provided with internal threads, and the insulator is tightly connected to the anti-slip bracket through the screw thread; a discharge ball II is installed on the anti-slip support, and the angle between the discharge ball II and the horizontal direction is 30° to 60°. Advantages: The built-in insulation structure avoids the easy breakage of the external insulator and the aging of ultraviolet radiation in the past, and the situation of quickly exiting operation.

Description

A Fixed Gap Overvoltage Protector

technical field

The invention relates to an insulating device for an overvoltage protector, in particular to a fixed gap overvoltage protector.

Background technique

In the past, the same kind of lightning protection equipment used the external insulator (bracket) to isolate the body and the discharge gap when the gap was fixed in series. This caused the external insulator (bracket) to be easily broken and aged by ultraviolet radiation during assembly and installation. , exits shortly.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a fixed-gap overvoltage protector, which is not easy to break and has a good discharge effect.

The present invention is realized by the following technical scheme: a fixed-gap overvoltage protector, comprising an arrester mandrel composed of an upper electrode, a resistor plate, a middle electrode and an insulator connected sequentially from top to bottom, and the arrester mandrel is surrounded by a Composite casing, a discharge ball I is installed horizontally on the middle electrode, the insulator is installed on the anti-slip support, and an insert is built in the top of the insulator. The insert is wide at the top and narrow at the bottom. The upper part of the insert is cylindrical, and the lower part is multi-faceted columnar. , an annular groove is provided in the middle section of the multi-faceted column, and a counterbore is opened from the upper end of the insert, and the inner wall of the counterbore is provided with internal threads, and the insulator is tightly connected to the anti-slip bracket through the screw thread; on the anti-slip support A discharge ball II is installed obliquely relative to the discharge ball I, the angle between the discharge ball II and the horizontal direction is 30°-60°, and the distance between the discharge ball I and the discharge ball II is 35-50mm.

The advantages of the present invention are: the original outer insulator (bracket) structure is abandoned, and the built-in insulating structure is adopted, which avoids the easy breakage of the outer insulator (bracket) and the aging of ultraviolet radiation, and the rapid exit from operation; the discharge effect is good.

Description of drawings

Figure 1 is a schematic diagram of the structure of the present invention;

Figure 2 is a schematic diagram of the insulator structure,

Fig. 3 is a structural schematic diagram of an insert;

Fig. 4 is A-A sectional view of Fig. 3;

Fig. 5 is another structural schematic view of the insert;

Fig. 6 is a B-B sectional view of Fig. 5 .

Detailed ways

As shown in Figure 1-6, a fixed-gap overvoltage protector includes an overvoltage protector mandrel composed of an upper electrode 2, a resistor 4, a middle electrode 5 and an insulator 6 sequentially connected from top to bottom. The core rod of the protector is covered with a composite jacket 3, a discharge ball I7 is installed horizontally on the middle electrode 5, the insulator 6 is installed on the anti-slip support 9, and a discharge ball II8 is installed on the anti-slip support 9 obliquely relative to the discharge ball I7 , The angle between the discharge ball II8 and the horizontal direction is 30°～60°, and the distance between the discharge ball I7 and the discharge ball II8 is 35～50mm. An insert 10 is built in the top of the insulator. The insert 10 is wide at the top and narrow at the bottom. The upper part of the insert is cylindrical, and the lower part is multi-faceted columnar. A counterbore 12, the inner wall of the counterbore is provided with an internal thread 11, and the insulator is tightly connected to the bracket through the screw thread.

The multi-sided columnar shape is a four-sided columnar shape, a five-sided columnar shape, a six-sided columnar shape, an eight-sided columnar shape or a cylindrical shape.

In order to realize the sealing performance of the molded product, a circular sinking groove 14 is provided on the upper surface of the insert 10 . The insulator is designed as a cylinder and placed at the bottom of the overvoltage protector, which isolates the internal current limiting element and discharge gap of the overvoltage protector, and is protected by a composite jacket outside.

In order to realize the integral connection of the insulator and the overvoltage protector, an arc-shaped slot 13 is provided at the top downward part of the insulator 6 .

The insert 10 is made of H59-62 brass or black metal material, which has good processing performance and high strength.

The insulator is made of imported glass fiber material, which has the advantages of light weight, small size, good impact, high mechanical strength, good insulation performance and simple production, and the insulator made of it has the advantages of heat resistance, mechanical properties and weather resistance Good performance, especially it can form a high-strength bond with unclean surfaces or even oily metal surfaces. After being connected with a composite jacket, it can effectively prevent the infiltration of rainwater.

The insert 10 is integrally molded and installed into the insulator.

During the development process, the laboratory conducts tests on various insulating (sub)materials, and conducts a thorough test on the prototypes manufactured to verify whether various performance indicators can meet the design requirements. Participated in the test insulators (materials): porcelain insulators, those with sheds, those without sheds, epoxy resin, epoxy glass fiber filament winding tubes and built-in insert insulators (this invention), the data are as follows;

When working, the insulator is installed upside down on the lower end of the middle electrode, the copper wire 1 is connected to the upper electrode 2 of the overvoltage protector, and the other end is connected to the transmission and distribution network. The other end of the upper electrode 2 is connected to the resistor sheet 4 , the middle electrode 5 and the insulator 6 in sequence. Among them, the middle electrode 4 is inlaid with a discharge ball I7 as one end of the discharge gap. The overvoltage protector is fixed on the anti-slip support 9 through the insulator 6, and a discharge ball II8 is installed on the anti-slip support 9 obliquely relative to the discharge ball I7. The angle between the discharge ball II8 and the horizontal direction is 30°~60°. The distance between the ball I7 and the discharge ball II8 is 35-50mm, forming a discharge gap to release the lightning current generated by the overvoltage. the

Claims (4)

1. A fixed-gap overvoltage protector, including an arrester mandrel composed of an upper electrode (2), a resistor (4), a middle electrode (5) and an insulator (6) sequentially connected from top to bottom, and the arrester mandrel The surrounding area is covered with a composite jacket (3), a discharge ball I (7) is installed horizontally on the middle electrode (5), the insulator 6 is installed on the anti-slip bracket (9), and an insert (10) is built in the top of the insulator; The feature is that the insert is wide at the top and narrow at the bottom, the upper part of the insert is cylindrical, and the lower part is multi-faceted columnar, a ring-shaped groove is provided in the middle section of the multi-faceted column, and a counterbore (12) is opened from the upper end of the insert, The inner wall of the counterbore is provided with an internal thread (11), and the insulator is tightly connected to the anti-slip support (9) through the screw thread; a discharge ball is installed on the anti-slip support (9) obliquely relative to the discharge ball I (7) II (8), the included angle between discharge ball II (8) and the horizontal direction is 30°-60°, and the distance between discharge ball I (7) and discharge ball II (8) is 35-50mm. 2. A fixed gap overvoltage protector according to claim 1, characterized in that: the multi-sided columnar shape is four-sided columnar, five-sided columnar, six-sided columnar, eight-sided columnar or cylindrical. 3. A fixed-gap overvoltage protector according to claim 1, characterized in that: a circular sinking groove (14) is provided on the upper end surface of the insert. 4. A fixed gap overvoltage protector according to any one of claims 1-3, characterized in that: the insulator is cylindrical, and an arc-shaped groove (13) is arranged on the upper part of the insulator.