CN202217555U - 500kV transmission line insulator with protective gap - Google Patents

Abstract

A 500kV transmission line insulator with a protective gap, including an insulator, a ground-side gap electrode, a high-voltage side gap electrode and accessories, the ground-side gap electrode and the high-voltage side gap electrode are installed on the ground side and the high-voltage side of the insulator respectively, and the gap is away from the axis of the insulator The distance between the gaps is not less than 400mm, and the distance between the gaps is between 65% and 95% of the height of the insulator structure. At the same time, the gap electrodes on the high-voltage side also serve as the voltage equalizing ring of the insulator. Parallel gap is a "draining type" protection method different from traditional lightning protection measures, which can avoid damage to insulators, improve the success rate of reclosing, and avoid permanent faults. The utility model has the functions of protecting the insulator from being damaged, and the reclosing can be successful, so that the lightning flashover becomes an instantaneous fault, and the normal power supply of the power grid is ensured. Easy to install.

Description

A 500kV Transmission Line Insulator with Protective Gap

Technical field:

The utility model relates to a 500kV power transmission line insulator with a protective gap, which is used to solve frequent insulator damage accidents caused by lightning discharges on 500kV high-voltage power transmission lines.

Background technique:

The lightning discharge of the transmission line has always been one of the problems affecting the safe operation of the line. In recent years, my country's power grid has carried out a lot of work in the transformation of transmission line lightning protection, and the trip rate of line lightning strikes has generally shown a downward trend; however, line lightning strike tripping cannot be completely avoided, and insulator string damage caused by line lightning strikes occasionally occurs.

At present, lightning protection measures widely adopted in the network include reducing grounding resistance, strengthening insulation, installing tower head lightning rods and ground wire lightning protection side pins, installing line lightning arresters, etc. The level of lightning resistance and the reduction of lightning tripping rate are ideologically "blocking" lightning protection measures. However, due to the randomness and complexity of lightning activities, as well as the diversity and difference of topographic and meteorological conditions in transmission line corridors, there are various problems in the above-mentioned measures in field use, and it is difficult to form effective measures.

Invention content:

The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned technologies, and provide a 500kV transmission line insulator with a protective gap, which can protect the insulator from burning caused by lightning discharge and improve the safe operation level of the line.

The utility model is designed for frequent lightning discharge accidents on transmission lines. A lightning discharge channel is formed between the gap electrode on the grounding side and the gap electrode on the high-voltage side, so that the lightning flashover along the gap protects the insulator and the transmission line from being damaged, and the reclosing can be successful, so that the lightning flashover becomes an instantaneous fault and ensures the normal power supply of the power grid .

A 500kV transmission line insulator with a protective gap provided according to the utility model includes an insulator, a ground-side gap electrode, a high-voltage side gap electrode and accessories, and is characterized in that: the ground-side gap electrode and the high-voltage side gap electrode are respectively Installed on the ground side and the high-voltage side of the insulator, and the distance between the ground-side gap electrode and the high-voltage side gap electrode is not greater than 95% of the height of the insulator structure, and not less than 95% of the height of the insulator structure 65%.

The insulators are 500kV porcelain insulator strings, or 500kV glass insulator strings, or 500kV composite insulators.

The ground-side gap electrode is a single metal tube or a single metal rod, the outer diameter of which is greater than 25 mm, and the end of which is a smooth curved surface with a radius of curvature not less than 25 mm.

There is at least one gap electrode on the ground side and no more than four.

The high-voltage side gap electrode is a ring-shaped metal tube or metal rod, the outer diameter of the metal tube or metal rod is not less than 45 mm, and the radius of curvature of the ring structure is not less than 200 mm.

The distance between the top end of the gap electrode on the ground side in the direction of the gap electrode on the high-voltage side and the axis of the insulator is not less than 400 mm, and the distance between the top end of the gap electrode on the high-voltage side in the direction of the gap electrode on the ground side and the axis of the insulator is not less than 400mm.

The ground-side gap electrode is fixed on the ground-side metal attachment or iron tower of the insulator.

The high voltage side gap electrode is fixed on the high voltage side metal attachment or line of the insulator.

The ring structure is elliptical, and serves as a voltage equalizing ring on the high voltage side of the insulator, and one or both ends of the ring structure are bent and upturned toward the gap electrode on the ground side.

According to the utility model, a drop indicating lightning protection device has the following advantages:

1. A lightning discharge channel is formed between the gap high-voltage electrode and the gap grounding electrode, so that the lightning flashover along the gap protects the insulator and the transmission line from being damaged, and the reclosing can be successful, so that the lightning flashover becomes an instantaneous fault and ensures the normal power supply of the power grid .

2. Reasonable parameter design ensures that lightning discharge occurs in the gap and protects the safe operation of the insulator.

3. Replace the original grading ring with the high-voltage side gap, and the potential distribution of the insulator is more uniform.

4. The design of the gap electrode is simplified to the greatest extent, light and convenient.

Description of drawings:

Fig. 1 is a schematic diagram of an embodiment of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 2 is a schematic diagram of another embodiment of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 3 is a schematic diagram of another embodiment of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 4 is a schematic diagram of a ground-side gap electrode of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 5 is a schematic diagram of a gap electrode on the high-voltage side of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 6 is a schematic diagram of another high-voltage side gap electrode of a 500kV transmission line insulator with a protective gap according to the present invention.

Fig. 7 is a schematic diagram of another high-voltage side gap electrode of a 500kV transmission line insulator with a protective gap according to the present invention.

Detailed ways:

An embodiment of the utility model is shown in Figure 1. A 500kV transmission line insulator with a protective gap provided by the utility model includes an insulator 1, a gap electrode 2 on the ground side, a gap electrode 3 on the high voltage side, an air gap 4, and a ground side The accessory group 5 and the high-voltage side accessory group 6; wherein the air gap 4 between the ground-side gap electrode 2 and the high-voltage side gap electrode 3 constitutes a lightning discharge channel. The ground side gap electrode 2 can be fixed on the ground side accessory group 5 or the iron tower, and the high voltage side gap electrode 3 can be fixed on the high voltage side accessory group 6 or the wire.

The figure is a schematic diagram of a single-side installation of a protective gap, and the insulator 1 is a single-string insulator. The gap electrode on the high voltage side is shown in Figure 5.

Another embodiment of the present utility model is shown in accompanying drawing 2, a schematic diagram of protective gaps installed on both sides of the insulator.

Another embodiment of the utility model is shown in Figure 3. The utility model provides a 500kV transmission line insulator with a protective gap, including the insulator 1, the gap electrode 2 on the ground side, the gap electrode 3 on the high voltage side, the air gap 4, the ground The side accessory group 5 and the high voltage side accessory group 6; wherein the air gap 4 between the ground side gap electrode 2 and the high voltage side gap electrode 3 forms a lightning discharge channel. Insulator 1 is a tension insulator with parallel double strings. The ground side gap electrode 2 can be fixed on the ground side accessory group 5 or the iron tower, and the high voltage side gap electrode 3 can be fixed on the high voltage side accessory group 6 or the wire. Its high-voltage side electrode is shown in Figure 7.

Accompanying drawing 4 is a schematic diagram of the grounding side gap electrode of a 500kV transmission line insulator with a protective gap of the present invention. The figure is its front view and side view, which is composed of a single metal tube, and its end is a smooth curved surface. Use the ground side of the insulators in Figures 1, 2, and 3.

Accompanying drawing 5 is the schematic diagram of the high-voltage side gap electrode of a 500kV transmission line insulator with a protective gap of the present invention, and the diagram is its front view and top view, with an elliptical ring structure and one side tilted. It is used on the high pressure side of accompanying drawing 1.

Fig. 6 is a schematic diagram of another high-voltage side gap electrode of a 500kV transmission line insulator with a protective gap according to the present invention. The diagram shows its front view and top view, an elliptical ring structure, and both sides are tilted.

Fig. 7 is a schematic diagram of another high-voltage side gap electrode of a 500kV transmission line insulator with a protective gap according to the present invention. The diagram shows its front view and top view, which are generally used on tension insulator strings.

The above preferred embodiments are only used to illustrate the utility model, but not to limit the utility model. Those skilled in the art can make various modifications and transformations without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions belong to the protection scope of the present utility model.

Claims (9)

1. A 500kV transmission line insulator with a protective gap, comprising an insulator, a ground-side gap electrode, a high-voltage side gap electrode and accessories, characterized in that: the ground-side gap electrode and the high-voltage side gap electrode are respectively installed on the The ground side and the high voltage side of the insulator, and the distance between the ground side gap electrode and the high voltage side gap electrode is not greater than 95% of the height of the insulator structure, and is not less than 65% of the height of the insulator structure. 2. A 500kV transmission line insulator with protective gap according to claim 1, characterized in that: said insulator is a series of 500kV porcelain insulators, or a series of 500kV glass insulators, or a 500kV composite insulator. 3. A 500kV transmission line insulator with protective gap as claimed in claim 1, characterized in that: said grounding side gap electrode is a single metal tube or a single metal rod, the outer diameter of which is greater than 25mm, and its The end is a smooth curved surface with a radius of curvature not less than 25mm. 4. A 500kV transmission line insulator with a protective gap according to claim 1, characterized in that: there is at least one gap electrode on the grounding side and no more than four. 5. A kind of 500kV transmission line insulator with protective gap as claimed in claim 1, characterized in that: said high-voltage side gap electrode is a ring-shaped metal tube or metal rod, and the outer diameter of the metal tube or metal rod is not Less than 45mm, the radius of curvature of the ring structure is not less than 200mm. 6. A 500kV transmission line insulator with a protective gap according to claim 1, characterized in that: the distance between the top of the gap electrode on the grounding side in the direction of the gap electrode on the high voltage side and the axis of the insulator is not less than 400 mm, The distance between the top end of the gap electrode on the high voltage side in the direction of the gap electrode on the ground side and the axis of the insulator is not less than 400 mm. 7. A 500kV transmission line insulator with protective gap according to claim 1, characterized in that: the ground side gap electrode is fixed on the ground side metal attachment or iron tower of the insulator. 8. A 500kV transmission line insulator with protective gap according to claim 1, characterized in that: the high voltage side gap electrode is fixed on the high voltage side metal attachment or line of the insulator. 9. A 500kV transmission line insulator with a protective gap as claimed in claim 5, characterized in that: the ring structure is elliptical and serves as the voltage equalizing ring on the high voltage side of the insulator at the same time, and the ring structure The single end or both ends are bent and upturned towards the ground side gap electrode.

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