CN201075673Y - Overvoltage protector of aerial insulated line - Google Patents

Abstract

The utility model discloses an over-voltage protector for an overhead insulated line and relates to a lightning protection device. The utility model includes an insulated conductor (1), an insulator (2), a current limiting component (3), a conduction ring (4), a connection hardware fitting (5), a cross arm (6) and a series gap (7); the insulator (2) is connected with the current limiting component (3) by the connection hardware fitting (5) and is fixed on the cross arm (6) of the line, the conduction ring (4) is horizontally fixed on the top end of the current limiting component (3), the insulator (2) passes the center of the conduction ring (4) and a certain series gap (7) is formed between the insulated conduction (1) and the conduction ring (4). The utility model is simple in structure, high in price performance ratio and is safe and reliable; furthermore, an insulated layer of the insulated conductor (1) needs not to be stripped when in installation, so the utility model can be widely applied to the lightning protection of the overhead insulated line.

Description

The insulated overhead line overvoltage protection device

Technical field

The utility model relates to a kind of lightning protection device, relates in particular to a kind of insulated overhead line overvoltage protection device.

Background technology

Lightning flashes and thunder rumbles is a kind of common natural phenomena.Lightning energy causes casualties; Building, structures breaking-up and on fire can be made, combustible and explosive articles can be ignited; Especially electric equipment, circuits such as electric power, communication, computer are caused huge destruction.For thunder and lightning, human also not finding at present controlled its effective way of control.But, some facilities such as thunder of taking shelter from the thunder, disappear are installed, can significantly reduce the thunderbolt loss.

Along with people are more and more higher to the power supply reliability requirement, and unexpected power outage will bring enormous economic loss to society.In order to solve of the influence of external objects such as branch, parabolic to distribution wire, improve power supply reliability, domesticly begin the city overhead distribution has been carried out the insulating transformation from the eighties.But along with the employing of aerial insulated cable, caused a new problem, promptly lightning overvoltage is done the time spent, and power frequency arc concentrates on the breakdown point of insulating barrier, causes insulated cable burning and fusing.Though metal oxide arrester can play the effect that prevents lightning overvoltage, it has following deficiency:

Must divest the insulating barrier of insulated cable when 1. installing, cause rainwater to divest an infiltration, the plain conductor of corrosion insulated cable along insulating barrier;

2. lightning arrester not only bears the power-frequency voltage effect for a long time, also will bear the effect of lightning overvoltage and power frequency continued flow simultaneously off and on, and aging easily, its fault is a lot, and cost is very high;

3. if because of big lightning current by lightning arrester, cause lightning arrester to hold can't stand and damage, cause short circuit ground connection, cause the insulated cable broken string.

Summary of the invention

The purpose of this utility model just is to overcome the above-mentioned shortcoming and defect that prior art exists, and a kind of insulated overhead line overvoltage protection device is provided.

The purpose of this utility model is achieved in that

As shown in Figure 1, the utility model comprises insulated conductor (1), insulator (2), current limiting element (3), drainage ring (4), connects gold utensil (5), cross-arm (6), series gap (7);

Insulator (2) couples together by connection gold utensil (5) and current limiting element (3) and is fixed on the circuit cross-arm (6), drainage ring of top horizontal fixed (4) at current limiting element (3), and insulator (2) passes drainage ring (4) between two parties, forms certain series gap (7) between insulated conductor (1) and the drainage ring (4).

Operation principle of the present utility model is:

When the lightning overvoltage flashover takes place in insulated conductor (1), the high pressure of lightning current at first punctures the insulating barrier of insulated conductor (1) and the series gap (7) between the stainless steel drainage ring (4), guide lightning current into current limiting element (3), and flow into the earth by current limiting element (3).

After the lightning current abrupt release, the voltage at current limiting element (3) two ends does not produce simultaneously in system under the situation of switching overvoltage and is power-frequency overvoltage (being system's maximum working voltage) to the maximum, and the load voltage value of current limiting element (3) design is higher than circuit power frequency overvoltage value, so flowing through the power frequency continued flow of current limiting element (3) is cut off, current limiting element (3) reverts to high-impedance state in moment, the magnitude of voltage that is added on the series gap (7) reduces, be not enough to pilot arc, the final rapid insulation recovery of air prevents that effectively suspended insulated guide wire (1) is because of the fuse purpose of (lightning-caused breaking) of power frequency continued flow high temperature thereby reach.

The utlity model has following advantage and good effect:

1, by the synergy of series gap (7) and current limiting element (3), can cut off power frequency continued flow effectively, avoid the broken string accident of insulated conductor (1) after thunderbolt;

Needn't divest the insulating barrier of insulated conductor (1) when 2, installing, thereby eliminate the shortcoming that lightning arrester is installed;

3, because of series gap (7) is arranged, current limiting element (3) only just works when lightning current, does not have power frequency continued flow at ordinary times and passes through, and has improved the life-span of the present utility model, helps the safe operation of electric power system;

Even 4 have big lightning current to cause current limiting element (3) to hold can't stand by current limiting element (3) and when damaging,, guarantee the safety of electric power system because of the buffer action of series gap (7) can not cause short circuit ground connection.

In a word, because the utility model is simple in structure, the cost performance height, safe and reliable, and need not divest the insulating barrier of suspended insulated guide wire (1) when installing, therefore can be widely used in the lightning protection of insulated overhead line.

Description of drawings

Fig. 1 is the utility model structure chart;

Fig. 2 is an annulus drainage loops composition;

Fig. 3 is a semi-ring drainage loops composition;

Fig. 4 is a straight line drainage loops composition;

Fig. 5 is a curve drainage loops composition.

Wherein:

The 1-insulated conductor;

The 2-insulator;

The 3-current limiting element;

4-drainage ring, 4.1-annulus drainage ring, 4.2-semi-ring drainage ring,

4.3-straight line drainage ring, 4.4-curve drainage ring;

5-connects gold utensil;

The 6-cross-arm;

The 7-series gap.

Embodiment

Further specify below in conjunction with drawings and Examples:

One, about totally

Press Fig. 1.

Two, about relevant parts

1, drainage ring (4)

Or be annulus drainage ring (4.1), as Fig. 2;

Or be semi-ring drainage ring (4.2), as Fig. 3;

Or be straight line drainage ring (4.3), as Fig. 4;

Or be curve drainage ring (4.4), as Fig. 5.

2, series gap (7)

Series gap (7) is 60mm～120mm.

Claims (3)

1. insulated overhead line overvoltage protection device is characterized in that:

Comprise insulated conductor (1), insulator (2), current limiting element (3), drainage ring (4), connect gold utensil (5), cross-arm (6), series gap (7);

Insulator (2) couples together by connection gold utensil (5) and current limiting element (3) and is fixed on the circuit cross-arm (6), drainage ring of top horizontal fixed (4) at current limiting element (3), and insulator (2) passes drainage ring (4) between two parties, forms certain series gap (7) between insulated conductor (1) and the drainage ring (4).

2. by the described a kind of insulated overhead line overvoltage protection device of claim 1, it is characterized in that:

Drainage ring (4) or be annulus drainage ring (4.1), or be semi-ring drainage ring (4.2), or be straight line drainage ring (4.3), or be curve drainage ring (4.4).

3. by the described a kind of insulated overhead line overvoltage protection device of claim 1, it is characterized in that:

Series gap (7) is 60mm～120mm.

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