CN104240868A - Line insulator and horn-shaped gap thereof - Google Patents

Abstract

The application provides a line insulator and its angular gap, the angular gap includes: a lower metal electrode connected to the lower end of the line insulator; an upper metal electrode connected to the upper end of the line insulator; The other end connected to the gas generating device and close to the lower metal electrode; wherein, the upper metal electrode and the lower metal electrode form an angular gap parallel to the line insulator; the gas generating device is used for A large amount of gas is generated under the thermal effect of the power frequency arc generated by the lightning strike, and the gas forms a high-speed airflow to blow out the power frequency arc. The device not only has low price and low cost, but also can generate high-pressure gas when the power-frequency arc burns, quickly blows out the arc, and ensures that no tripping accident occurs on the line.

Description

A line insulator and its angular gap

technical field

The present application relates to the technical field of power supply safety, in particular to a line insulator and an angular gap thereof.

Background technique

The transmission line is the main artery of the power system, which transports huge electric energy from the power source to the user. Long power transmission lines pass through plains, mountains, and across rivers and lakes. The geographical and meteorological conditions encountered are different, so there are more chances of being struck by lightning.

Under the lightning impulse voltage, the line insulator is prone to impact flashover, forming an arc channel connecting the wire and the suspension point. If the arc is extinguished after the lightning current passes, the transmission line can continue to operate normally without tripping. If the arc cannot be extinguished automatically, the power frequency voltage of the transmission line is added to both ends of the arc channel. Since the arc resistance is very small, generally around a few ohms, the power frequency current flowing through the arc channel may be as high as several kA, so large The current is difficult to extinguish by itself, so the impact flashover will be transformed into a stable and continuous burning power frequency arc. At this time, the relay protection will operate to trip the line and cause power supply interruption.

Contents of the invention

In view of this, the present application provides a line insulator and its angular gap to overcome the technical problem in the prior art that the current is difficult to extinguish due to the impact flashover of the line insulator under the lightning impulse voltage, which causes the line to trip and cause power supply interruption.

To achieve the above object, the present invention provides the following technical solutions:

A line insulator corner gap, comprising:

a lower metal electrode connected to the lower end of the line insulator;

an upper metal electrode connected at one end to the upper end of the line insulator;

a gas generating device connected to the other end of the upper metal electrode and close to the lower metal electrode;

Wherein, the upper metal electrode and the lower metal electrode form an angular gap parallel to the line insulator;

The gas generating device is used to generate a large amount of gas under the heat effect of the power frequency arc generated by the lightning strike, and the gas forms a high-speed airflow to blow out the power frequency arc.

Preferably, the gas generating device includes: an arc blowing nozzle and an electrode tip covered with a gas generating material, wherein,

The electrode tip covered with the gas-generating material is used to generate a large amount of gas under the thermal effect of the power frequency arc generated by the lightning strike, and form a high-speed airflow through the arc blowing nozzle to blow out the power frequency arc.

Preferably, the gas generating device further includes: an insulating shed, used to increase the insulation distance along the surface, so that the flashover starts from the bare metal surface inside the arc blowing nozzle.

Preferably, the insulating shed is a high-temperature vulcanized silicone fluororubber climbing shed.

Preferably, the gas-generating material is polyethylene polymer or polyvinyl chloride polymer.

Preferably, it also includes: an upper metal electrode fixing nut, used for fixedly connecting the upper metal electrode to the upper end of the line insulator.

Preferably, it further includes: a lower metal electrode fixing nut, which is used to fixedly connect the lower metal electrode to the lower end of the line insulator.

Preferably, the upper metal electrode and the lower metal electrode are electrodes made of copper alloy.

Preferably, the upper metal electrode and the lower metal electrode are electrodes made of stainless steel.

A line insulator, comprising: a line insulator body and any one of the above angular gaps.

It can be seen from the above technical solutions that the present application provides a line insulator and its angular gap, the angular gap includes: a lower metal electrode connected to the lower end of the line insulator; an upper metal electrode connected to the upper end of the line insulator at one end; A gas generating device connected to the other end of the upper metal electrode and close to the lower metal electrode; wherein, the upper metal electrode and the lower metal electrode form an angular gap parallel to the line insulator; the The gas generating device is used to generate a large amount of gas under the thermal effect of the power frequency arc generated by the lightning strike, and the gas forms a high-speed airflow to blow out the power frequency arc. The device not only has low price and low cost, but also can generate high-pressure gas when the power-frequency arc burns, quickly blows out the arc, and ensures that no tripping accident occurs on the line.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic structural diagram of a line insulator corner gap provided by Embodiment 1 of the present application;

Fig. 2 is a schematic structural diagram of a line insulator corner gap provided in Embodiment 2 of the present application;

Fig. 3 is a schematic diagram of gas-generating arc blowing in the angular gap of a line insulator provided in Embodiment 2 of the present application;

FIG. 4 is a schematic diagram of simulated voltage and current waveforms of a line insulator angular gap provided in Embodiment 2 of the present application;

FIG. 5 is a schematic structural diagram of a line insulator provided in Embodiment 3 of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to overcome the technical problem in the prior art that the line insulator has an impact flashover under the lightning impulse voltage and the current is difficult to extinguish by itself, causing the line to trip and cause power supply interruption, the application provides a line insulator and its angular gap, which can be used at power frequency When the arc burns, high-pressure gas is generated, which quickly blows out the arc to ensure that the line does not trip.

Embodiment one

As shown in FIG. 1 , FIG. 1 is a schematic structural diagram of a line insulator corner gap provided in Embodiment 1 of the present application. This angular clearance includes:

a lower metal electrode 101 connected to the lower end of the line insulator;

an upper metal electrode 102 with one end connected to the upper end of the line insulator;

A gas generating device 103 connected to the other end of the upper metal electrode 102 and close to the lower metal electrode 101;

Wherein, the upper metal electrode 102 and the lower metal electrode 101 form an angular gap parallel to the line insulator;

The gas generating device 103 is used to generate a large amount of gas under the heat effect of the power frequency arc generated by the lightning impact, and the gas forms a high-speed airflow to blow out the power frequency arc.

When the tower top of the transmission line is struck by lightning, the tower top potential, which was originally a low potential, rises rapidly and becomes a high potential. When the potential difference between the tower top potential and the conductor potential exceeds the lightning impulse withstand voltage of the insulator, the insulator string A flashover occurs, known as a counterattack. When the arrester discharges, a strong impulse current flows into the earth. After the large current passes, the power frequency current will continue to flow along the original impulse current channel. This current is called power frequency freewheeling. When the power frequency continuous current flows through the surface or gap of the insulator, it will form an arc accompanied by strong luminescence and heat generation and generate a large number of charged particles. This kind of arc is called a power frequency arc. At this time, the gas generating device generates a large amount of gas under the thermal effect of the power frequency arc, and the gas forms a high-speed airflow to blow out the power frequency arc, so that the line will not trip and the power supply will not be interrupted.

It can be seen from the above technical solutions that Embodiment 1 of the present application provides a line insulator corner gap, including: a lower metal electrode connected to the lower end of the line insulator; an upper metal electrode connected to the upper end of the line insulator; The other end of the upper metal electrode is connected to a gas generating device close to the lower metal electrode; wherein, the upper metal electrode and the lower metal electrode form an angular gap connected in parallel with the line insulator; the gas generating device The device is used to generate a large amount of gas under the heat effect of the power frequency arc generated by the lightning strike, and the gas forms a high-speed airflow to blow out the power frequency arc. The device not only has low price and low cost, but also can generate high-pressure gas when the power-frequency arc burns, quickly blows out the arc, and ensures that no tripping accident occurs on the line.

Embodiment two

As shown in FIG. 2 , FIG. 2 is a schematic structural diagram of a line insulator corner gap provided in Embodiment 2 of the present application. This angular clearance includes:

A lower metal electrode 201 connected to the lower end of the line insulator.

In this embodiment, it further includes: a lower metal electrode fixing nut 202 for fixedly connecting the lower metal electrode 201 to the lower end of the line insulator. The lower metal electrode 201 can be an electrode made of copper alloy or stainless steel, which is not limited here and can be selected by those skilled in the art according to specific conditions.

An upper metal electrode 203 with one end connected to the upper end of the line insulator.

In this embodiment, it also includes: an upper metal electrode fixing nut 204 for fixing and connecting the upper metal electrode 203 to the upper end of the line insulator. The upper metal electrode 203 can be an electrode made of copper alloy or stainless steel, which is not limited here and can be selected by those skilled in the art according to specific conditions.

A gas generating device connected to the other end of the upper metal electrode 203 and close to the lower metal electrode 201 . The gas generating device is used to generate a large amount of gas under the thermal effect of the power frequency arc generated by the lightning impact, and the gas forms a high-speed airflow to blow out the power frequency arc.

Specifically, in this embodiment, the gas generating device includes: an arc blowing nozzle 205 and an electrode tip 206 covered with a gas generating material.

The electrode tip 206 covered with gas-generating material is used to generate a large amount of gas under the thermal effect of the power frequency arc generated by the lightning strike, and form a high-speed airflow through the arc blowing nozzle 205 to blow out the power frequency arc. The gas-generating material can be polyethylene polymer or polyvinyl chloride polymer, etc., which are not limited here and can be selected according to specific conditions.

It should be noted that, in this embodiment, the gas generating device also includes: an insulating shed 207, which is used to increase the insulation distance along the surface to prevent the flashover from starting from the exposed metal part above the arc blowing nozzle, and to make the flashover from The bare metal surface inside the blow nozzle starts.

Specifically, the insulating shed 207 can be a climbing shed made of high-temperature vulcanized silicone fluororubber, and of course it can also be an insulating shed made of other materials, which is not limited here and can be selected according to specific conditions.

Among them, the upper metal electrode 203 and the lower metal electrode 201 form an angular gap connected in parallel with the line insulator. When the lightning overvoltage comes, the gap is broken down, and the arc starts from the exposed metal part in the arc blowing nozzle 205 and extends downward. To the lower metal electrode 201, a conductive path is formed. After the lightning impulse current passes, the power frequency continuous current continues to flow along the conductive channel. Due to the thermal effect of the arc, the gas-generating material on the electrode tip 206 covered with the gas-generating material generates a large amount of gas, and the gas accumulates and expands rapidly, forming With very high air pressure, a large amount of gas is sprayed out through the fine arc blowing nozzle 205 in a very short time, forming a high-speed airflow, thereby blowing out the arc. The function of the blowing nozzle 205 is to limit the diameter of the gas outlet, thereby forming a high-speed airflow.

As shown in FIG. 3 , FIG. 3 is a schematic diagram of gas-generating arc blowing in an angular gap of a line insulator provided in Embodiment 2 of the present application. At the moment of lightning strike, due to the effect of lightning overvoltage, the gap is broken down to form a flashover channel. The gap is broken down, and the arc starts from the exposed metal part on the nozzle and extends downward to the lower metal electrode, forming a conductive channel. After the lightning impulse current passes, the power-frequency continuous current continues to flow along the conductive channel, forming a power-frequency arc. Due to the strong thermal effect of the power-frequency arc, the gas-generating material on the electrode tip covered with the gas-generating material produces a large amount of gas . The gas expands rapidly to form a high pressure, and passes through the fine arc blowing nozzle to form a high-speed airflow, thereby blowing out the arc.

As shown in FIG. 4 , FIG. 4 is a schematic diagram of simulated voltage and current waveforms of a line insulator angular gap provided in Embodiment 2 of the present application. It can be seen from the figure that the power frequency freewheeling goes out in half of the power frequency cycle, the line voltage returns to normal, and the line does not trip, which does not affect the normal operation of the system.

The structure of the device is simple, the cost is cheap, and the installation of the whole line can be realized to ensure the operation reliability of the line; on the other hand, the device has a certain arc extinguishing ability.

It can be seen from the above technical solutions that Embodiment 2 of the present application provides a line insulator corner gap, including: a lower metal electrode connected to the lower end of the line insulator; an upper metal electrode connected to the upper end of the line insulator; The other end of the upper metal electrode is connected to a gas generating device close to the lower metal electrode; wherein, the upper metal electrode and the lower metal electrode form an angular gap connected in parallel with the line insulator; the gas generating device The device is used to generate a large amount of gas under the heat effect of the power frequency arc generated by the lightning strike, and the gas forms a high-speed airflow to blow out the power frequency arc. The device not only has low price and low cost, but also can generate high-pressure gas when the power-frequency arc burns, quickly blows out the arc, and ensures that no tripping accident occurs on the line.

Embodiment Three

As shown in FIG. 5 , FIG. 5 is a schematic structural diagram of a line insulator provided in Embodiment 3 of the present application. The line insulator includes: the line insulator angular gap 501 and the line insulator body 502 described in any one of the first embodiment or the second embodiment.

The angular gap 501 of the line insulator is used to generate high-pressure gas when the power frequency arc burns, and quickly blow out the arc to ensure that the line does not trip.

The line insulator body 502 is used to suspend power lines.

The line insulator is only used to suspend the power line under normal circumstances. In the case of lightning, the line insulator can generate high-pressure gas to blow out the power frequency arc through its angular gap when the power frequency arc burns, so as to ensure that the line does not trip.

It can be seen from the above technical solutions that Embodiment 3 of the present application discloses a line insulator, which includes a line insulator corner gap and a line insulator body. The line insulator is not only low in price and low in cost, but also hangs the power line under normal circumstances. In the case of lightning, the line insulator can generate high-pressure gas to blow out the power frequency arc through its angular gap when the power frequency arc burns, so as to ensure that the line does not occur tripping accident.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a line insulator angle-style gap, is characterized in that, comprising:

The lower metal electrode be connected with the lower end of line insulator;

The upper metal electrode that one end is connected with the upper end of described line insulator;

Be connected with the other end of described upper metal electrode and the aerogenesis apparatus close with described lower metal electrode;

Wherein, described upper metal electrode and described lower metal electrode form an angular clearance in parallel with described line insulator;

Described aerogenesis apparatus produces a large amount of gas under being used for the thermal effect effect of the power frequency arc produced at lightning impulse, and described gas forms high velocity air to blow out described power frequency arc.

2. angle-style gap according to claim 1, is characterized in that, described aerogenesis apparatus comprises: arc blow-out nozzle and the electrode tip being coated with gas exhausted material, wherein,

The described electrode tip being coated with gas exhausted material produces a large amount of gas under the thermal effect effect of power frequency arc that produces at lightning impulse, and forms high velocity air to blow out described power frequency arc by described arc blow-out nozzle.

3. angle-style gap according to claim 2, is characterized in that, described aerogenesis apparatus also comprises: insulation full skirt, for increasing the insulation distance along face, makes flashover initial from the bare metallic surface of described arc blow-out nozzle interior.

4. angle-style gap according to claim 3, is characterized in that, described insulation full skirt is that full skirt is climbed in the increasing of high-temperature vulcanized silicon fluorubber.

5. angle-style gap according to claim 2, is characterized in that, described gas exhausted material is vinyl polymer polymer or PVC macromolecular polymer.

6. angle-style gap according to claim 1, is characterized in that, also comprise: upper metal electrode hold-down nut, for described upper metal electrode being fixedly connected on the upper end of described line insulator.

7. angle-style gap according to claim 1, is characterized in that, also comprise: lower metal electrode hold-down nut, for described lower metal electrode being fixedly connected on the lower end of described line insulator.

8. angle-style gap according to claim 1, is characterized in that, described upper metal electrode and described lower metal electrode are the electrode of copper alloy material.

9. angle-style gap according to claim 1, is characterized in that, described upper metal electrode and described lower metal electrode are the electrode of stainless steel.

10. a line insulator, is characterized in that, comprising: line insulator body and the angle-style gap described in claim 1 to 9 any one.