CN203631985U - Parallel-gap adjusting lightning-protection device in shape of umbrella frame for insulator - Google Patents

Abstract

The umbrella-shaped insulator lightning protection device for adjusting the parallel gap includes an insulator, and the two ends of the insulator are fixed to the ground side electrode and the wire side electrode. The ground side electrode and the wire side electrode are claws with at least three fingers, and the two sides of the insulator The paw indices are the same and set accordingly. The umbrella rib-shaped adjustable parallel gap lightning protection device of the utility model has a simple structure and is easy to install. The claw fingers of the electrode on the wire side or the electrode on the ground side are movably connected, and the claw fingers move along the plane where the insulator axis is located to adjust the ground wire side The distance between the electrode and the electrode on the wire side is available for insulators of different lengths.

Description

Umbrella-shaped insulator lightning protection device for adjusting parallel gap

technical field

The utility model relates to a lightning protection device for electric power overhead lines, in particular to an insulator lightning protection device for adjusting parallel gaps in the shape of an umbrella.

Background technique

Lightning protection of overhead power transmission lines has always been a topic that power workers have been working hard to explore. In recent years, the faults caused by lightning in the power grid still account for a large proportion, including power-frequency freewheeling after lightning flashover damages insulators and their fittings, leading to line accidents. Lightning fault is still one of the important factors affecting the safety of power grid.

The existing lightning protection measures for overhead power transmission lines, such as erecting incoming lightning wires, reducing the grounding resistance of towers, and strengthening insulation, etc., the core idea is to improve the lightning resistance level of the line as much as possible and reduce the lightning tripping rate. These lightning protection measures can be summarized as "blocking" lightning protection methods. For the actual situation of weak grid structure and poor performance of (oil) switch in the early stage of our country, it is appropriate to use the above method for lightning protection. In recent years, my country's power grid has developed rapidly, and the grid structure has become stronger and stronger; with technological progress, a large number of SF6 switches have been used in substations, relay protection has been computerized, and reclosing devices have been widely used, in order to develop new lightning protection methods Favorable conditions are provided. At this time, if the original lightning protection method is still used, it seems conservative and one-sided. In addition, the method of installing line-type mine inlets is very expensive and cannot be widely used.

The patent application number is 200420001291.8 for the parallel gap lightning protection device for overhead lines. The disclosed parallel gap lightning protection device has a simple structure and is easy to install. The electrode material and diameter can withstand repeated burning by high-current arcs. However, since the electrodes on the grounding side and the wire side are not adjustable, for insulators with different lengths, due to the large gap between the two electrodes, they cannot play a protective role.

Utility model content

The invention aims at the problem that the gap of the parallel gap lightning protection device in the prior art cannot be adjusted, and the distance between the two electrodes cannot be adjusted. The utility model provides an insulator lightning protection device with a simple umbrella rib shape for adjusting the parallel gap.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the insulator lightning protection device for adjusting the parallel gap in umbrella shape, including an insulator, and the two ends of the insulator are fixed to the ground side electrode and the wire side electrode, and the ground side electrode and the wire side electrode are fixed. The side electrodes are claws with at least three claw fingers, and the claw indexes on both sides of the insulator are the same and correspondingly arranged.

The claw index is one of 3, 5 and 7.

The fingers of the electrode on the guide side are movably connected, and the fingers move along the plane where the axis of the insulator is located to adjust the distance between the electrode on the ground side and the electrode on the wire side.

Said movable connection, the claw finger and the intermediate shaft of the metal fitting on the wire side are connected by an umbrella bone type, the claw finger is the support bone of the umbrella surface, and the intermediate shaft of the metal fitting is an umbrella rod.

The beneficial effect is: the core of the "parallel gap lightning protection" method is to allow the line to have a certain lightning tripping rate, but the reclosing can be successful without permanent failure. Receive lightning and guide power frequency arc. The parallel gap formed by the electrodes on the ground side and the electrodes on the wire side is connected to the ground side and the line side of the insulator string so that they have the same potential respectively. When the overhead line is struck by lightning, the protection gap will discharge first.

The adjustable parallel gap lightning protection device of the utility model has a simple structure and is easy to install. The claw fingers of the electrode on the wire side or the electrode on the ground side are movably connected, and the claw fingers move along the plane where the axis of the insulator is located to adjust the electrode on the ground wire side and The distance between the electrodes on the wire side can be used for insulators of different lengths.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, the umbrella-shaped insulator lightning protection device for adjusting the parallel gap includes an insulator 1, and the two ends of the insulator are fixed with a ground-side electrode 3 and a lead-side electrode 2, and the ground-side electrode 3 and lead-side electrode 2 are There are at least three claw fingers, and the claw indexes on both sides of the insulator are the same and set correspondingly. The claw index is one of 3, 5 and 7. The fingers of the lead-side electrode 2 are movably connected, and the fingers move along the plane where the axis of the insulator is located to adjust the distance between the ground-side electrode 3 and the lead-side electrode 2 . Said movable connection, the claw finger and the intermediate shaft of the metal fitting on the wire side are connected by an umbrella bone type, the claw finger is the support bone of the umbrella surface, and the intermediate shaft of the metal fitting is an umbrella rod.

After the lightning protection device is installed at both ends of the insulator, the height of the electrode on the wire side can be adjusted through the umbrella-shaped claw fingers to achieve a suitable protection gap. When the overhead line is struck by lightning, the protection gap will discharge first.

Claims (4)

1. Umbrella-shaped insulator lightning protection device for adjusting the parallel gap, including an insulator (1), the two ends of the insulator are fixed to the ground side electrode (3) and the wire side electrode (2), characterized in that: the ground side electrode ( 3) There are at least three claw fingers with the wire-side electrode (2), and the claw indexes on both sides of the insulator are the same and set correspondingly. 2. The umbrella-rib-shaped insulator lightning protection device for adjusting the parallel gap according to claim 1, characterized in that: the claw index is one of 3, 5, and 7. 3. The umbrella-shaped insulator lightning protection device for adjusting the parallel gap according to claim 2, characterized in that: the claw fingers of the wire side electrodes (2) are movably connected, and the claw fingers move along the plane where the axis of the insulator is located , to adjust the distance between the electrode on the ground side (3) and the electrode on the wire side (2). 4. The umbrella rib-shaped insulator lightning protection device for adjusting the parallel gap according to claim 3, characterized in that: the movable connection, the claw finger and the intermediate shaft of the metal fitting on the wire side are connected by an umbrella rib, and the claw finger is The supporting bone of the umbrella surface, and the middle axis of the metal tool is the umbrella pole.

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