CN204012615U - A kind of Broken of Overhead Insulation Lines By Lightning protector - Google Patents

Abstract

The utility model relates to a protective device for lightning breakage of overhead insulated wires, which comprises a lightning arrester and a pole tower crossarm, the lower end of the lightning arrester is fixed on the pole tower crossarm, an insulating pillar is arranged above the lightning arrester, and the insulating pillar and the lightning arrester connected in series; the insulating support leads out to a discharge gap through a steel rod, and the discharge gap is connected in parallel with the insulating support; an insulated wire is fixed above the insulating support. The protection device can not only support the wire, but also prevent lightning tripping and lightning disconnection, and has better overall economy. The protective device is easy to install and has low requirements for on-site construction techniques. At the same time, because the spherical discharge gap distance is fixed, the discharge voltage of the protective device is relatively stable, and the weather resistance is good.

Description

An overhead insulated wire lightning strike protection device

technical field

The utility model relates to a lightning protection device, in particular to a lightning protection device for overhead insulated wires.

Background technique

Overhead insulated conductors better solve the corridor and safety problems that bare conductors cannot solve. Compared with cables, they have obvious advantages of less investment and faster construction. However, the statistics of lightning disconnection and insulator breakdown accidents on overhead insulated lines are on the rise, and have become one of the main reasons that threaten the safe operation of distribution lines.

At present, there are various types of protection measures for overhead insulated conductor lightning strike disconnection, mainly including arc-proof fittings, gapless zinc oxide arrester, lightning protection shielding wire, ring electrode type series gap overvoltage protector, lightning protection post insulator, puncture electrode type series gap Overvoltage protectors, built-in column voltage limiters, insulating tower heads, fixed gap overvoltage protectors, etc., have also produced many derivative products on this basis. Nevertheless, the existing protection measures for lightning breakage of overhead insulated conductors have certain deficiencies in terms of technical and economic performance. For example, although arc-proof fittings are simple in structure and cheap in price, this method has high requirements for installation technology. Due to the insufficient puncture of protective fittings, there have been many lightning-strike disconnection faults; although overhead shielding wires are relatively simple in construction, they are more economical. , without destroying the sealing and insulation properties of the wires, can effectively reduce the lightning-induced overvoltage of the line, and reduce the rate of lightning disconnection, but the lightning protection effect of the shielded wire is limited. In the line reconstruction project, it is more difficult to install shielded wires above the towers, and the entire line needs to be powered off. If the shielded wires are installed below the towers, the lightning protection effect is relatively poor. The ring electrode type series gap overvoltage protector is easy to install, does not need to break the insulation layer of the wire, and at the same time has no problem of wire sealing and waterproofing, and will not affect the mechanical tensile performance and service life of the wire, but this method has poor weather resistance. It is very prone to deflection, which affects the performance of the equipment; the insulation tower head integrates the insulation pillar and the pole, or the top of the pole is preset with a fixed interface for the insulation tower head, which can greatly simplify the on-site installation procedure, although the implementation form is simple and maintenance-free , but the insulation tower head has poor mechanical properties, high price, and poor economic efficiency, so it is currently used less.

Utility model content

The purpose of the utility model is to provide a lightning strike protection device for overhead insulated conductors which is easy to install and has good weather resistance.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows.

A protection device for lightning breakage of overhead insulated wires, comprising a lightning arrester and a pole tower cross arm, the lower end of the lightning arrester is fixed on the pole tower cross arm, an insulating support is arranged above the lightning arrester, and the insulating support is connected in series with the lightning arrester; The insulating support leads out the discharge gap through the steel rod, and the discharge gap is connected in parallel with the insulating support; an insulated wire is fixed above the insulating support.

Further, the lightning arrester, the insulating support and the discharge gap are of an integral structure.

Further, the discharge gap is a spherical discharge gap.

Further, the ball gap distance of the spherical discharge gap is 30mm-70mm.

Further, the spherical discharge gap is made of copper or stainless steel.

The beneficial effects of the utility model are: the lightning protection device for overhead insulated wires provided by the utility model can not only support the wires, but also prevent lightning tripping and lightning disconnection, and the overall economy is better . The protective device is easy to install and has low requirements for on-site construction technology. At the same time, because the spherical discharge gap distance is fixed, the discharge voltage of the protective device is relatively stable, and the weather resistance is good.

Description of drawings

Fig. 1 is a structural schematic diagram of the lightning protection device for overhead insulated conductors of the present invention.

In the figure, 1-insulated wire, 2-insulated pillar, 3-lightning arrester, 4-tower crossarm, 5-spherical discharge gap, 6-steel rod.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The lightning protection device for overhead insulated wires of the present utility model is shown in Figure 1. It includes a lightning arrester 3, an insulating support 2, and a spherical discharge gap 5. The pillars 2 are connected in series; the spherical discharge gap 5 is led out through the steel rod 6 and connected in parallel with the insulating pillar 2, and its discharge voltage matches the insulation level of the insulating pillar 2 to protect the insulating pillar 2; during operation, the spherical discharge gap 5 The distance is fixed without adjustment. For 10kV and 20kV transmission lines, the distance between the ball gaps can be 30mm-70mm; in order to make the discharge voltage stable; the insulating wire 1 is fixed on the top of the insulating pillar 2, and the lower end of the arrester 3 is fixed on the cross arm of the tower 4 on. The protective device can not only support the wire, but also prevent lightning tripping and lightning disconnection.

Preferably, the spherical discharge gap can be made of copper or stainless steel, with a smooth surface, so that the discharge voltage is relatively stable.

The insulation level of 10kV and 20kV overhead insulated wires is low. When lightning strikes the ground near the transmission line, a high overvoltage will be induced on the wires, causing a short circuit fault between the line and the ground. After the lightning flashover, the continuous power frequency short-circuit arc will be fixed at a certain position of the insulated wire, the arc root cannot move, and the insulated wire will melt and break quickly under high temperature burns. The protective device of the utility model comprises three parts: a lightning arrester, an insulating support, and a spherical discharge gap. When the line is running normally, due to the effect of the insulating support 2, the lightning arrester 3 part does not bear the working voltage at this time, which does not affect the normal operation of the line. When a lightning flashover occurs on the line, because the distance between the spherical discharge gaps 5 at both ends of the insulating support 2 is short, the spherical discharge gap 5 discharges first, and the insulating support 2 is effectively protected. Afterwards, the lightning current will be released to the ground through the arrester 3. Due to the limiting effect of the arrester 3, no continuous power frequency continuous current will be generated. The current value flowing through the insulated wire 1 is not high, which can effectively prevent the overhead insulated wire from being broken by lightning. Wire.

The above descriptions are only preferred embodiments of the present utility model, and are not used to limit the implementation scope of the present utility model; if the utility model is modified or equivalently replaced without departing from the spirit and scope of the present utility model, all should be covered by this utility model. within the protection scope of utility model claims.

Claims (5)

1. a Broken of Overhead Insulation Lines By Lightning protector, comprise lightning arrester and cross arm of tower, the lower end of described lightning arrester is fixed on described cross arm of tower, it is characterized in that, the top of lightning arrester is provided with insulation column, and described insulation column and lightning arrester are connected in series; Described insulation column is drawn discharging gap by rod iron, and described discharging gap and insulation column are connected in parallel; The top of described insulation column is installed with insulated conductor.

2. Broken of Overhead Insulation Lines By Lightning protector according to claim 1, is characterized in that, described lightning arrester, described insulation column and described discharging gap are integral type structure.

3. Broken of Overhead Insulation Lines By Lightning protector according to claim 1 and 2, is characterized in that, described discharging gap is ball-type discharging gap.

4. Broken of Overhead Insulation Lines By Lightning protector according to claim 3, is characterized in that, the ball gap spacing of described ball-type discharging gap is 30mm-70mm.

5. Broken of Overhead Insulation Lines By Lightning protector according to claim 4, is characterized in that, described ball-type discharging gap is made by copper or stainless steel.