CN205610158U - Insulated line overvoltage protector - Google Patents

Abstract

An overvoltage protector for insulated lines, comprising a lightning arrester, an insulator, a metal bracket, and wire clamping hardware, the lower ends of the zinc oxide lightning arrester and the insulator are fixedly connected to both ends of the metal bracket, and the wire clamping hardware is connected to The upper end of the insulator also includes an arc striker and an arc strike cap, the arc strike cap is arranged on the top end of the arrester, one end of the arc strike rod is connected to the clamping fitting, and the other end extends toward the top end of the arrester And form a serial gap with the arc starting cap. In the overvoltage protector, there is a gap between the external series rods of the lightning arrester, and the gap discharge is not affected by the wind swing and the change of the wire in winter and summer, and the overvoltage protection performance is stable; when lightning strikes or power frequency overvoltage, the lightning protector discharges in the gap, and the lightning arrester operates , Introducing the overvoltage to the ground, during normal operation, the power frequency voltage is isolated by the gap, the protector does not withstand continuous power frequency freewheeling, and is in a "rest" state, which is not easy to cause aging, has a long service life and low cost.

Description

Insulated Line Overvoltage Protector

technical field

The utility model belongs to the field of insulating circuit protection, in particular to an insulating circuit overvoltage protector.

Background technique

With the rapid development of my country's electric power, the problem of lightning strikes on transmission lines has become more and more prominent, which has seriously affected the normal power supply quality of the power grid. Since there are a large number of electrical installations with insufficient lightning strike resistance in power transmission and distribution lines, it is difficult to directly withstand lightning strikes. The phenomenon of broken wires, blown insulators, and shed sheds due to arc burning has become a technical problem faced by the power system. At present, the main measures for lightning protection of overhead distribution lines at home and abroad include: erecting overhead lightning protection lines, installing clamp insulators, installing overvoltage protectors on column insulators, and installing arc-proof hardware on the load side. The overvoltage protector connects a metal oxide arrester in series with the insulator. Although this method plays a role of lightning overvoltage protection, the arrester not only withstands the effect of power frequency overvoltage for a long time, but also intermittently withstands lightning overvoltage and power frequency continuous Flow effect, easy aging, many failures, high replacement cost. If the excessive current passes through the arrester, the arrester cannot withstand it and is damaged, causing a short circuit to ground, resulting in disconnection of the insulated cable.

Contents of the invention

The problem to be solved by the utility model is to provide an insulated line overvoltage protector.

In order to solve the above problems, the technical solution provided by the utility model is: an insulated line overvoltage protector, including a lightning arrester, an insulator, a metal bracket, and a clamping fitting, and the lower ends of the zinc oxide lightning arrester and the insulator are respectively fixedly connected to the The two ends of the metal bracket, the wire clamping fittings are connected to the upper end of the insulator, and in this technical solution, an arc striking rod and an arc striking cap are also included, and the arc striking cap is arranged on the top end of the arrester. One end of the arc-starting rod is connected to the wire-clamping hardware, and the other end extends toward the top end of the arrester and forms a series gap with the arc-starting cap. The biggest advantage of gap discharge in the overvoltage protector is that it is not affected by wind swing and wire changes in winter and summer in the line, and the overvoltage protection performance is stable; when lightning strikes or power frequency overvoltage, lightning protection The protector gap discharges, the arrester operates, and the overvoltage is introduced into the ground. During normal operation, the power frequency voltage is isolated by the gap, and the protector does not withstand continuous power frequency continuous current, and is in a "rest" state, which reduces the aging degree of the arrester and prolongs the service life. , thereby reducing the cost of use.

Further, the wire clamping hardware includes a wire clamping seat and a wire crimping block, and one end of the arc striker is connected to the wire clamping seat.

Further, the metal bracket includes two parts that can be adjusted up and down, and they are fixedly connected by bolts, and the installation holes on the metal bracket corresponding to the bolts are waist-shaped holes. The metal bracket is fixed by detachable bolts, and the bolt installation hole is a waist-shaped hole, which is convenient for the two parts of the metal bracket to be adjusted up and down. The structure is simple, and it is convenient for the adjustment of the series gap.

Further, the arc striking rod is in the form of a continuous transverse arm section and an obliquely curved section, and the ball head at the top of the obliquely curved section forms a series gap with the arc striking cap.

Further, the distance between the series gaps is 70-100mm.

Further, the arrester is a gapless zinc oxide arrester, which can give full play to the non-linear characteristics of the zinc oxide resistor, and overcome the problems of discharge arcing in pure gap lightning protectors, easy burning of gap electrodes, and burning of wires. .

Further, the metal bracket is connected to a ground terminal, and the ground terminal is connected to the ground.

Further, the lower ends of the lightning arrester and the insulator are fixed to both ends of the metal bracket by bolts, and the bolt installation holes corresponding to at least one end of the metal bracket are waist-shaped holes.

The utility model has the advantages of:

1. The gap between the external series rods of the overvoltage protector arrester, the gap discharge is relatively stable, and its biggest advantage is that it is not affected by the wind swing in the line and the change of the wire in winter and summer, and the overvoltage protection performance is stable; When the voltage is high, the gap discharge arrester acts to introduce the overvoltage into the ground. During normal operation, the power frequency voltage is isolated by the gap, and the protector does not bear continuous power frequency continuous flow, and is in a "rest" state, which reduces the aging degree of the arrester and prolongs the service life. , thereby reducing the cost of use.

2. The structure of the device is simple. The lightning arrester and the insulator are fixed on the metal bracket by bolts, and the bolt through hole is a waist hole, which is convenient for adjusting the distance between the lightning arrester and the insulator. In addition, the metal bracket is connected by two detachable parts through bolts. The bolt installation hole is The waist-shaped hole facilitates the dislocation movement of the two parts up and down, and facilitates the adjustment of the gap between the series. The protector has a simple structure, stable performance, and is easy to install.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further

Figure 1 is a schematic structural diagram of the insulated line overvoltage protector.

Among them: 1. Lightning arrester; 2. Insulator; 3. Metal bracket; 4. Clamping hardware; 41. Clamping seat; 42. Pressing block; 8. Steel feet.

detailed description

Embodiment 1: The insulated line overvoltage protector shown in Figure 1 includes a lightning arrester 1, an insulator 2, a metal bracket 3, a clamping fitting 4, an arc striking rod 5, and an arc striking cap 6, and the lower end of the arrester 1 is fixedly connected to the One end of the metal bracket 3, the lower end of the insulator 2 is provided with a steel foot 8, and the insulator 2 is fixed to the other end of the metal bracket 3 through the steel foot 8. The lower ends of the lightning arrester 1 and the insulator 2 are fixed to both ends of the metal bracket 3 by bolts, and the bolt installation holes corresponding to at least one end of the metal bracket 3 are waist-shaped holes. The clamping hardware 4 is connected to the upper end of the insulator 2 . The arc cap 6 is arranged on the top end of the arrester 1 . One end of the arc striking rod 5 is connected to the wire clamping fitting 4 , and the other end extends toward the top end of the arrester 1 and forms a series gap 7 with the arc striking cap 6 . The wire clamping fitting 4 includes a wire clamping seat 41 and a wire clamping block 42 , insulated wires pass between the wire clamping base 41 and the wire clamping block 42 , and one end of the arc striker 5 is connected to the wire clamping base 41 . The metal bracket 3 includes two parts that can be adjusted up and down. They are connected by bolts. The installation holes corresponding to the bolts on the metal bracket 3 are waist-shaped holes. The metal bracket 3 is connected to a ground terminal, and the ground terminal is grounded. connect. In this example, the arc striking rod 5 is in the form of a continuous transverse arm section and an obliquely curved section, and the ball head at the top of the obliquely curved section forms a serial gap 7 with the arc striking cap 6 . The distance between the series gaps 7 is 70-100mm. Arrester 1 is a gapless zinc oxide arrester.

When the line is affected by lightning impulse overvoltage or power frequency overvoltage, before the overvoltage reaches the critical point of insulator 2 flashover, the series gap 7 of the overvoltage protector will discharge, and the gapless zinc oxide arrester 1 will act. The connected metal support 3 and the grounding terminal (not shown) connected to the metal support 3 lead the overvoltage into the ground to ensure the normal operation of the insulator 2 and the insulated wire. In normal operation, the power frequency voltage is isolated by the series gap 7, the overvoltage protector does not withstand continuous power frequency freewheeling, and is in a "rest" state to ensure the normal operation of the power system, and also reduce the oxidation degree of the arrester and prolong its use life.

The above examples are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to allow people familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model with this. All equivalent transformations or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (8)

1. an insulated circuit overvoltage protector, including spark gap (1), insulator (2), metal rack (3), and clamp gold utensil (4), the bottom of described spark gap (1) and insulator (2) is individually fixed in described metal rack (3) two ends, described clamp gold utensil (4) is connected to described insulator (2) upper end, it is characterized in that, also include starting rod (5) and striking cap (6), described striking cap (6) is located at described spark gap (1) top ends, described starting rod (5) one end is connected to described clamp gold utensil (4), the other end tends to spark gap (1) top ends and extends and form a series gap (7) with described striking cap (6).

Insulated circuit overvoltage protector the most according to claim 1; it is characterized in that; described clamp gold utensil (4) includes tension seat (41) and wire pressing block (42), and described starting rod (5) one end is connected on described tension seat (41).

Insulated circuit overvoltage protector the most according to claim 1; it is characterized in that; described metal rack (3) includes the two parts regulated that can misplace up and down; being bolted to connection between them, the installing hole of the upper corresponding described bolt of described metal rack (3) is mounting hole.

Insulated circuit overvoltage protector the most according to claim 1; it is characterized in that; described starting rod (5) is in continuous print transverse arm section and oblique curved segment, and the bulb at described oblique curved segment top forms series gap (7) with described striking cap (6).

5. according to the insulated circuit overvoltage protector described in claim 1 or 4, it is characterised in that, described series gap (7) spacing is 70～100mm.

Insulated circuit overvoltage protector the most according to claim 1, it is characterised in that, described spark gap (1) is zero-clearance zinc oxide lightning arrester.

7., according to the insulated circuit overvoltage protector described in claim 1 or 3, it is characterised in that described metal rack (3) connects a ground terminal, described ground terminal ground connects.

Insulated circuit overvoltage protector the most according to claim 1; it is characterized in that; the bottom of described spark gap (1) and insulator (2) is all secured by bolts in described metal rack (3) two ends, and bolt mounting holes corresponding to described metal rack (3) at least one end is mounting hole.