CN202102814U - Porcelain insulator for preventing insulated conductor breakage caused by lightning stroke - Google Patents

Abstract

The utility model discloses a porcelain insulator for preventing insulated wires from being broken by lightning, and belongs to the field of lightning protection devices. The utility model uses the porcelain insulator to properly peel off the insulating layer at the fixed point of the insulated wire, and installs a metal wire clip to withstand the continuous flow of the power frequency to avoid burning the insulated wire, and also sets the arc discharge gap, when the lightning strike occurs, The power frequency continuous flow is guided to the arc strike plate at the bottom of the lower mounting base by means of the arc strike opening of the protective cover, and released to the ground through the insulator mounting frame, so as to avoid burning the insulated wire and burning the insulator. In addition, an insulating protective cover is installed to improve the reliability of power supply and prevent water from entering the insulated wire core, and an insulating sheath is installed to increase the dry arc distance of the insulator to improve the insulation level of the insulator.

Description

A Porcelain Insulator Used to Prevent Insulated Conductors from Breaking Due to Lightning

technical field

The utility model relates to the field of lightning protection devices, in particular to a porcelain insulator used to prevent insulated wires from being broken by lightning.

Background technique

In order to reduce the failure of overhead distribution lines caused by external factors such as trees, birds, and snow accumulation, and improve the reliability of power supply. Overseas developed countries have gradually adopted overhead insulated conductors since the late 1960s. In Japan, overhead distribution lines have basically been insulated. Since the 1980s, my country has also begun to implement insulation transformation pilot projects for urban overhead distribution networks, and has accelerated the pace since the 1990s. Especially in recent years, a large number of insulated lines have been used in urban and rural power grid renovation projects. Insulated wires solve a series of unsafe problems existing in bare wires, but the problem of power failure due to lightning strikes is very prominent.

At present, the insulation layer is not peeled off at the fixed part of the insulated wire used in the 10kv urban overhead power line. When the insulating layer of the insulated wire is directly struck by lightning or struck by lightning, a phase-to-phase short circuit is formed, and the power frequency continuous current continues to burn through the pinhole channel formed by the breakdown, which eventually causes the insulated wire to burn out, resulting in an accident in which the insulated wire is disconnected.

Economically developed countries have used overhead insulated conductors for power transmission and distribution for a long time and have accumulated a lot of experience. In order to reduce the ever-increasing rate of lightning outage accidents, many preventive measures and methods have been adopted, as follows:

(1) Overhead arrester

In open areas, it is a traditional method with a large investment to erect overhead lightning conductors on the same pole to deal with power frequency freewheeling of power distribution overhead insulated lines. However, due to the low insulation level of the distribution line design, it is very easy to cause a flashover after lightning strikes the overhead lightning conductor, and it will still cause power frequency freewheeling to burn the insulated conductor. Therefore, this method is rarely used abroad.

(2) Zinc oxide arrester

People use the nonlinear resistance characteristics of zinc oxide arresters and the characteristics of quickly blocking power-frequency freewheeling, and are widely used in lines to limit lightning power-frequency freewheeling. The protection range is limited, and basically it can only protect the pole equipment. Japan, the United States, Canada and other countries have invested huge sums of money to transform the lines. After installing three (phase) zinc oxide arresters on each base pole, the power failure rate due to lightning strikes was reduced from 93.3% to 2.7%, and almost no lightning strike disconnection accidents occurred. When the gapless zinc oxide arrester is used for line lightning protection, the arrester is directly connected to the insulated wire. This is the continuation of the power station arrester technology, which has the advantages of reliable impact energy absorption and no discharge delay.

In the process of realizing the utility model, the inventor finds that the prior art has at least the following problems:

Due to the low insulation level of the distribution line design, it is very easy to cause a flashover after lightning strikes the overhead lightning conductor, and it will still cause power frequency freewheeling to burn the insulated conductor. Since the gapless arrester has been subjected to power frequency voltage for a long time, it also has to withstand the effects of lightning overvoltage and power frequency continuous current intermittently. The arrester is easy to age, so there are many accidents in the arrester. Since the arrester is directly connected to the insulated wire, when an accident occurs to the arrester, it may affect the normal power supply of the line.

Utility model content

In order to solve the phase-to-phase short circuit formed when the insulating layer of the insulated wire is directly struck by lightning or struck by lightning, the power frequency continuous current continues to burn through the pinhole channel formed by the breakdown, which will eventually cause the insulated wire to burn, thereby causing the insulated wire to drop the accident To solve the problem, the embodiment of the utility model provides a porcelain insulator for preventing lightning breakage of insulated wires. Described technical scheme is as follows:

A porcelain insulator for preventing insulated wires from being disconnected by lightning, the porcelain insulator comprising: an insulator body, an upper attachment, a lower attachment, a metal wire clamp, an insulated wire, an arc strike plate, a protective cover, an arc strike opening, and an insulating sheath ; Wherein, the upper end of the insulator body is fixed with the upper attachment, the lower end of the insulator body is fixed with the lower attachment, the top of the upper attachment is provided with a metal wire clamp, and the metal wire clamp is provided with the The above insulated wire, the upper part of the lower accessory is provided with the insulating sheath, the bottom of the lower accessory is fixed with the arc strike plate, the arc strike plate is arranged crosswise with the insulated conductor, and the upper accessory jacket The protective cover is provided, the metal wire clip is located in the protective cover, and the arc starting port is provided in the protective cover corresponding to the arc starting end of the arc starting plate.

Further, the part of the insulated wire located inside the metal clamp is a bare wire, and the bare wire is covered with an aluminum tape.

Further, the intersection angle between the arc striker and the insulated wire is 90 degrees.

The beneficial effect of the technical solution provided by the embodiment of the utility model is: the utility model is provided with an arc striking discharge gap, and when a lightning strike occurs, the power frequency continuous flow is guided to the lower installation by means of the arc strike port of the protective cover. The arc strike plate at the bottom of the seat is released to the ground through the insulator mounting frame, so as to avoid burning the insulated wire and the insulator. The insulator protective cover is installed to improve the reliability of power supply and prevent the core of the insulated wire from entering water. Insulation sheath to improve the insulation level of insulators.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings listed below are only some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is a schematic structural diagram of a porcelain insulator used to prevent insulated wires from being disconnected by lightning according to an embodiment of the present invention.

In accompanying drawing 1, the components list represented by each label is as follows:

1. Insulator body; 2. Upper accessories; 3. Lower accessories; 4. Metal wire clips; 5. Insulated wires;

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

Example:

As shown in Figure 1, a porcelain insulator used to prevent insulated wires from being disconnected by lightning, including an insulator body 1, an upper attachment 2 is fixed on the upper end of the insulator body 1, a lower attachment 3 and an upper attachment 2 are fixed on the lower end of the insulator body 1 There is a metal wire clamp 4 on the top of the metal wire clamp 4, and an insulated wire 5 is arranged inside the metal wire clamp 4. The part of the insulated wire 5 located in the metal wire clamp is a bare wire, and the bare wire is covered with an aluminum tape. The insulating sheath 9, the arc strike plate 6 is fixed on the bottom of the lower attachment 3, the cross angle between the arc strike plate 6 and the insulated conductor 5 is set at 90 degrees, the outer cover of the upper attachment 2 is provided with a protective cover 7, and the metal wire clamp 4 is located in the protective cover 7 Inside, the protective cover 7 is provided with an arc opening 8 at a position corresponding to the arc end of the arc plate 6 .

Wherein, the insulator body 1 has a diameter of 125mm and a length of 280mm.

For the porcelain insulator provided above, when a lightning strike occurs, the arcing position will not be at the insulated wire but at the metal attachment, that is, the arcing port, so that the power frequency continuous current can be guided to the setting by means of the protective cover arcing port. The arc striking plate at the bottom of the lower mounting base is released to the ground through the insulator mounting frame, so as to avoid burning the insulated wire and burning the insulator.

A porcelain insulator used to prevent insulated wires from being disconnected by lightning, the installation method of which is as follows:

(1) First peel off the insulated wire 5 fixed on the metal wire clamp 4, and wrap it with aluminum tape;

(2) Strip the insulated wire 5 and install the wrapped part in the metal wire clip 4 correctly. The pressing plate of the metal wire clamp 4 presses the insulated wire 5 downward, and exerts force on the left and right hex nuts at the same time until it is tightened;

(3) After the above installation components are installed and tightened, cover the insulating protective cover 7;

(4) Adjust the arc discharge gap (that is, the arc electrode), and at the same time, the arc opening 8 of the insulating protective cover 7 is consistent with the arc electrode (on the same line), so that it forms an angle of 90° with the insulated wire 5 .

In the utility model, the insulation layer is properly peeled off at the fixed point of the insulated wire 5, and the metal wire clamp 4 is added to withstand the continuous flow of power frequency to avoid burning the insulated wire, and an arc discharge gap is also set to prevent the continuous flow of power frequency. Burn the insulator, thereby greatly reducing lightning strike disconnection accidents; In addition, an insulating shield 7 is installed to improve power supply reliability and prevent insulated wire cores from entering water, and an insulating sheath 9 is installed to improve the insulation level of the insulator.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. A porcelain insulator for preventing insulated wires from being disconnected by lightning, characterized in that the porcelain insulator comprises: an insulator body (1), an upper attachment (2), a lower attachment (3), and a metal wire clamp (4) , insulated wire (5), arc strike plate (6), protective cover (7), arc strike port (8), insulating sheath (9); wherein, the upper end of the insulator body (1) is fixed with the upper Attachment (2), the lower end of the insulator body (1) is fixed with the lower attachment (3), the top of the upper attachment (2) is provided with a metal wire clamp (4), and the metal wire clamp (4) The insulated wire (5) is provided inside, the insulating sheath (9) is provided on the upper part of the lower accessory (3), and the arc strike plate (6) is fixed on the bottom of the lower accessory (3) , the arc strike plate (6) is arranged crosswise with the insulated wire (5), the upper accessory (2) is provided with the protective cover (7), and the metal wire clip (4) is located on the protective Inside the cover (7), the arc-starting port (8) is provided in the protective cover (7) corresponding to the arc-starting end of the arc-starting plate (6). 2. The porcelain insulator according to claim 1, characterized in that the part of the insulated wire (5) located inside the metal wire clamp (4) is a bare wire, and the bare wire is covered with an aluminum tape. 3. The porcelain insulator according to claim 1, characterized in that, the intersection angle between the arc strike plate (6) and the insulated wire (5) is 90 degrees. the

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