CN204315320U - Parallel gap lightning protection device - Google Patents

Abstract

The utility model discloses a parallel gap lightning protection device, which belongs to the technical field of lightning protection protection of power distribution lines; It can locate the lightning flashover more accurately, and can monitor the occurrence of lightning flashover according to the glass sleeve. The structure is simple and the installation is convenient. Multiple punctures that penetrate the insulation layer. The lateral end of the right-angle L-shaped lead-side electrode is a ball and the vertical end is fixedly connected to the drainage tube. A lightning flashover monitoring device is fixed on the horizontal rod of the lead-side electrode. Glass sleeve, one end of the electrode on the grounding side is a ball and the other end is fixedly connected to the bottom of the insulator, the electrode on the grounding side is provided with a ridge-like protruding broken line structure at the end close to the ball, the electrode on the wire side and the electrode on the grounding side Electrode tips are perfectly aligned.

Description

Parallel gap lightning protection device

technical field

The utility model discloses a parallel gap lightning protection device, which belongs to the technical field of lightning protection protection for power distribution lines.

Background technique

Most of the research on lightning hazards in domestic power systems focuses on transmission lines, substations and power plants, etc., and there is a lack of systematic research on lightning protection of distribution lines. In order to solve the influence of branches and other external objects on distribution lines and improve the reliability of power supply, most cities in my country are gradually replacing 10kV overhead lines with insulated conductor distribution lines. Although the insulation transformation of medium-voltage overhead distribution lines has been carried out, the health level of distribution lines has been greatly improved compared with bare conductors, but at the same time new technical problems have emerged, one of which is insulation The problem of wire disconnection due to lightning strike. Once the distribution line is disconnected, it will cause a long-term power supply interruption, and the charged wire will fall on the ground, which may cause electric shock accidents to passers-by. This disconnection and combustion accident seriously affect the safety of the distribution system It has brought great inconvenience to the national economy and people's life. Therefore, it is very necessary to carry out research on the disconnection mechanism of insulated wires and its protection technology.

Compared with high-voltage transmission lines, 10kV distribution lines generally do not adopt methods such as erecting lightning protection lines and coupling ground wires, but only use "blocking" lightning protection methods such as reinforced insulation and installation of line arresters to improve the safety of the distribution network. Lightning resistance level, thereby reducing the lightning tripping rate. However, these measures have certain limitations, and cannot effectively prevent the occurrence of power outages caused by lightning strikes on distribution lines. Moreover, the "blocking" type of lightning protection has become conservative and one-sided. It is necessary to further study economical and practical new lightning protection measures for lines. In recent years, the parallel gap device, as a "drainage type" lightning protection device, has become a powerful supplement to the traditional line lightning protection method, which can solve the problems faced by distribution lines in lightning protection. The device is low in cost, easy to install, and easy to be popularized in a large area, and can significantly reduce permanent faults such as lightning strike disconnection and insulator burst, and reduce economic losses caused by power outage accidents.

The working principle of the parallel gap is: connect a pair of metal electrodes in parallel next to the insulator to form a protective gap, which is installed at the end of the insulator. It can be used in conjunction with the automatic reclosing switch in the system when the lightning strikes the line, and the lightning current is grounded in time to the user. Uninterrupted power supply, so as to prevent flashover on the surface of the insulator and maintain the normal operation of the line; and by cooperating with the arc extinguishing device at the end of the parallel gap, the arc extinguishing device can be used to lead the arc to the end of the insulator to extinguish quickly before the reclosing action. In this way, the insulator will not be burned out while ensuring the safe operation of the line. The existing parallel gap lightning protection device for overhead distribution line insulators has the following main disadvantages: ① The parallel gap lightning protection device is only suitable for lightning protection of overhead bare wires, and the structure of the device is not suitable for overhead insulation ② The parallel gap lightning protection device can solve the problem of disconnection of insulated wires to a certain extent by dredging power frequency arcs through drain needles, but when the insulated wires withstand large currents, it may still be impossible because of the small contact area between the puncture part and it. Pull the wires on both sides firmly to cause a disconnection.

Utility model content

The utility model overcomes the deficiencies of the existing technology, and the technical problem to be solved is to provide a parallel gap lightning protection device for power distribution lines, which can effectively solve the problem of lightning disconnection of power distribution lines, and more accurately locate lightning flashovers. And it can monitor the occurrence of lightning flashover according to the glass sleeve, and has simple structure and convenient installation.

In order to solve the above technical problems, the technical solution adopted by the utility model is: parallel gap lightning protection device, including drainage tube, wire side electrode and grounding side electrode, the drainage tube is tightly sleeved on the wire, and the inner wall of the drainage tube is provided with Multiple punctures that penetrate the insulating layer, the lateral end of the right-angled L-shaped lead-side electrode is a ball and the vertical end is fixedly connected to the drainage tube, and a lightning strike monitoring device is fixed on the horizontal rod of the lead-side electrode. Flashover glass sleeve, one end of the electrode on the ground side is a ball and the other end is fixedly connected to the bottom of the insulator, the electrode on the ground side is provided with a ridge-shaped protruding broken line structure at the end close to the ball, the electrode on the wire side Align absolutely with the electrode tip of the ground-side electrode.

The puncture height on the inner wall of the drainage tube is greater than the thickness of the insulating layer of the wire.

The short-circuit distance between the lead-side electrode and the ground-side electrode is 22-33 mm.

The bottom end of the insulator is a square prism, and the electrode on the grounding side is fixedly connected to the bottom end of the insulator through two angle steel bolts.

The puncture, drainage tube, wire-side electrode and ground-side electrode are all made of carbon steel with high temperature resistance and high strength.

Compared with the prior art, the utility model has the beneficial effects that: the utility model short-circuits a part of the insulator through the electrode on the wire side and the electrode on the ground side, so that lightning flashover can be effectively located, and the electrode on the wire side passes through the puncture of the drainage tube to eliminate the flashover. When the network occurs, the high potential on the wire is drawn out. Through the cooperation of the wire side electrode and the grounding side electrode, the power frequency arc can be effectively dredged, and the insulator is prevented from being severely ablated; the glass sleeve on the wire side electrode can be directly obtained from the appearance of the utility model It has important guiding significance for engineering design and later adjustment to observe whether there is lightning flashover.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

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

Fig. 2 is a schematic cross-sectional structure diagram of the drainage tube in the present invention.

Fig. 3 is a schematic diagram of the connection structure between the ground-side electrode and the bottom end of the insulator in the present invention.

In the figure: 1 is the drainage tube, 2 is the electrode on the wire side, 3 is the electrode on the ground side, 4 is the wire, 5 is the puncture, 6 is the insulator, 7 is the ridge-shaped protrusion, and 8 is the glass sleeve.

Detailed ways

As shown in Figure 1-3, the parallel gap lightning protection device of the present invention includes a drainage tube 1, a wire side electrode 2 and a grounding side electrode 3, the drainage tube 1 is tightly set on the wire 4, and the inner wall of the drainage tube 1 is provided with There are multiple punctures 5 penetrating the insulating layer, the lateral end of the right-angled L-shaped lead-side electrode 2 is a ball and the vertical end is fixedly connected to the drainage tube 1, and the horizontal rod of the lead-side electrode 2 is set on the A glass sleeve 8 for monitoring lightning flashover is fixed. One end of the grounding side electrode 3 is a ball and the other end is fixedly connected to the bottom of the insulator 6. The grounding side electrode 3 is provided with a ridge-shaped protrusion near the ball 7, the electrode ends of the lead-side electrode 2 and the ground-side electrode 3 are absolutely aligned.

The height of the puncture 5 on the inner wall of the drainage tube 1 is greater than the thickness of the insulating layer of the wire 4 .

The short-circuit distance between the lead-side electrode 2 and the ground-side electrode 3 is 22-33mm.

The bottom end of the insulator 6 is a square prism, and the ground-side electrode 3 and the bottom end of the insulator 6 are fixedly connected together by two angle steel bolts.

The puncture 5, the drainage tube 1, the lead-side electrode 2 and the ground-side electrode 3 are all made of carbon steel with high temperature resistance and high strength.

Example

The drainage tube 1 is two hollow semi-cylinders with a horizontal length of about 80-100 mm, which are tightly fixed on the wire 4 by bolts at a distance of 230-260 mm from the axis of the insulator. The puncture 5 on the inner wall of the drainage tube 1 is a conical metal tip and many The punctures of different sizes are arranged at intervals, as shown in Figure 2-3, and a large puncture is set after every three small punctures. The puncture is in contact with the insulation layer to fasten the wire, and the large puncture pierces the insulation layer and is in close contact with the wire to lead to a high potential;

The electrode 2 on the wire side is L-shaped at right angles, with a horizontal length of 180-220 mm and a vertical length of 15-20 mm. The horizontal end is provided with a steel ball, and the vertical upper end is fixedly connected to the drainage tube 1 through a nut;

The electrode 3 on the ground side is a zigzag structure with ridge-like protrusions. The vertical height of the ridge-like protrusions 7 is 15-25 mm, and the horizontal length is 420-460 mm. Steel balls are arranged at one end of the ridge-like protrusions 7 , the other end is fastened to the bottom end of the insulator 6 by a nut;

The ends of the lead-side electrode 2 and the ground-side electrode 3 must be absolutely aligned during installation.

The following is the implementation effect description of the utility model.

50% lightning impulse discharge test: After the utility model is installed at both ends of the insulator, the lightning wave flashover path is basically positioned at the end of the parallel gap, and there is a good linear relationship between the gap distance and the discharge voltage value.

Lightning impulse volt-second characteristic test: The purpose is to study the influence of the steepness change of the lightning shock wave on the flashover voltage and discharge time of the annular parallel gap. The gap plays a better role in protecting the insulator string.

The above embodiments of the utility model have been described in detail in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiments. Make various changes below. For example, the glass bushing in the utility model can also adopt any structure that can realize the function of monitoring whether there is lightning flashover and power frequency current, such as one-time painting to observe the burning situation.

Claims (5)

1. parallel gap lightning protection device, it is characterized in that: comprise drainage tube (1), side of wire electrode (2) and ground side electrode (3), drainage tube (1) is closely sleeved on wire (4), the inwall of drainage tube (1) is provided with multiple puncture (5) penetrating insulating barrier, the lateral ends of the side of wire electrode (2) of right angle L shape is ball and vertical end is fixedly connected with drainage tube (1), on the transverse bar of described side of wire electrode (2), suit is fixed with the glass bushing (8) of a monitoring lightning stroke flashover, one end of ground side electrode (3) is ball and the other end is fixedly connected with insulator (6) bottom, ground side electrode (3) is the meander line structure being provided with a mountain ridge (7) near one end of ball, the electrode tip of described side of wire electrode (2) and ground side electrode (3) definitely aligns.

2. parallel gap lightning protection device according to claim 1, is characterized in that: the puncture (5) on the inwall of described drainage tube (1) is highly greater than the thickness of insulating layer of wire (4).

3. parallel gap lightning protection device according to claim 1 and 2, is characterized in that: the short circuit distance of described side of wire electrode (2) and ground side electrode (3) is 22-33 ㎜.

4. parallel gap lightning protection device according to claim 1 and 2, is characterized in that: described insulator (6) bottom is quadrangular, and ground side electrode (3) and insulator (6) bottom are fixed together by two angle steel bolt that is connected.

5. parallel gap lightning protection device according to claim 1 and 2, is characterized in that: described puncture (5), drainage tube (1), side of wire electrode (2) and ground side electrode (3) make by the high temperature resistant and carbon steel that intensity is high.