CN202076058U - Straight-line tower lightning protection device with 35-kilovolt circuit - Google Patents

Abstract

The utility model relates to a lightning protection device, in particular to a lightning strike protection device for a 35kV line straight tower. The 35kV line tower lightning strike protection device is characterized in that it includes an arc striking electrode, a zinc oxide arrester, an arc striking electrode connecting piece, a Z-shaped connecting piece, a supporting cross arm and a fixing clip; the arc striking electrode is composed of an arc striking electrode connecting piece and The high-voltage end screw of the zinc oxide arrester is fixedly connected; one end of the Z-shaped connector is fixedly connected with the low-voltage end screw of the zinc oxide arrester, and the other end of the Z-shaped connector is fixedly connected with one end of the supporting cross-arm; the other end of the supporting cross-arm is at least It is fixed by 2 bolts and the fixed clip to form a clip. The device can effectively prevent lightning strike disconnection accidents, reduce the lightning strike tripping rate of lines, and improve the reliability of power supply.

Description

35kV Line Straight Tower Lightning Protection Device

technical field

The utility model relates to a lightning protection device; in particular, it relates to a lightning protection device for a 35kV line straight tower, in particular to a lightning arrester for preventing a 35kV overhead power distribution line from being disconnected by lightning.

Background technique

With the transformation of the insulation of power system lines and the continuous deterioration of the global climate, lightning flashovers are prone to occur on high-voltage lines, and the problem of disconnection caused by lightning strikes is very prominent, which in turn causes power frequency arcs to burn the wires.

In recent years, with the large-scale transformation of urban and rural power grids in my country's power system, the statistics of lightning tripping, disconnection and insulator flashover accidents on transmission and distribution lines are also on the rise. Lightning strikes on overhead wires occur frequently at home and abroad, causing many personal casualties and huge economic losses. Lightning tripping, disconnection and insulator flashover accidents have seriously threatened the safe operation of transmission and distribution lines.

Overhead power distribution lines use insulated wires, which solve the corridor and safety problems that bare wires cannot solve. Compared with cables, they have obvious advantages of less investment and faster construction. However, the problem of lightning disconnection is prominent. There have been many lightning disconnection accidents of insulated conductors across the country, and some even 10kV and 35kV bare conductors have also experienced lightning disconnection accidents. Relevant data show that the total number of failures of insulated conductors is 15.3% of the total number of bare conductors during operation, and the number of failures is greatly reduced; among them, lightning strike accidents of insulated conductors account for 36.8% of the total number of accidents, and the lightning strike disconnection rate is 96.8%. Therefore, with the continuous increase of the length of insulated lines, lightning breakage and insulator flashover accidents have become the main source of serious threats to the safe operation of distribution lines. It can be seen that lightning strike disconnection is an important cause of insulated conductor operation accidents.

The current lightning protection measures include installation of overhead ground wires, piercing anti-arc fittings, lightning protection post insulators and zinc oxide arresters, etc. However, according to feedback from field practice, there are various problems and it is difficult to form effective measures.

According to the on-site operation conditions, the insulation level of the 35kV distribution line is relatively prone to lightning flashover, and then a power frequency arc is formed to burn the wire. 35kV bare conductors are prone to lightning disconnection accidents or relatively high lightning tripping rates. The main reason for disconnection is to build an arc-shaped power-frequency freewheeling flow on the lightning flashover channel, and the temperature of the arc root is very high, which can burn the wire in a short time.

Contents of the invention

The purpose of the utility model is to provide a 35kV line tower lightning strike protection device, which can effectively prevent lightning strike disconnection accidents, reduce the lightning strike trip rate of the line, and improve the reliability of power supply.

In order to achieve the above purpose, the technical solution adopted by the utility model is: 35kV line straight tower lightning strike protection device, which is characterized in that it includes arc striking electrodes, zinc oxide arresters, arc striking electrode connectors, Z-shaped connectors, supporting cross-arms and the fixing clip; the arc striking electrode is fixedly connected with the high-voltage end screw of the zinc oxide arrester by the arc striking electrode connector; one end of the Z-shaped connector is fixedly connected with the low-voltage end screw of the zinc oxide arrester, and the other end of the Z-shaped connector is connected with the One end of the supporting cross-arm is fixedly connected; the other end of the supporting cross-arm is fixed by at least 2 bolts and the fixing clip to form a clip.

The arc-starting electrode is a "T"-shaped structure formed by fixed connection of a horizontally placed arc-shaped discharge plate and a vertically placed cylinder. The middle of the cylinder is provided with fixed screw holes and nuts from top to bottom. hole.

The arc-starting electrode connector is an angle steel, and the two ends of the arc-starting electrode connector are respectively provided with fixing screw holes in the center.

The Z-shaped connector is a Z-shaped structure, one end of the Z-shaped connector is provided with two fixing screw holes, and the other end of the Z-shaped connector is provided with two supporting screw holes.

One end of the supporting cross-arm is provided with 2 supporting screw holes; the other end of the supporting cross-arm is provided with 4 fixing screw holes.

The fixing clip is provided with 4 fixing screw holes.

The beneficial effects of the utility model are:

1. The above-mentioned structure can effectively prevent lightning strike disconnection accidents, reduce the lightning trip rate of the line, and improve the reliability of power supply.

2. Meet the performance requirements of the zinc oxide arrester and fittings specified in the national standard, and the discharge residual voltage is much lower than the flashover voltage of the insulator; the outer layer of the zinc oxide arrester is made of synthetic silicone rubber, which has good insulation performance and antifouling performance.

3. The design is simple, the construction and installation are convenient, and the pure air gap is used. The zinc oxide arrester does not bear the system voltage and operating overvoltage, reduces maintenance costs, and enhances reliability and service life.

4. Due to the use of natural body grounding, no additional grounding resistance is required, and the installation is convenient, simple and reliable.

5. With good action characteristics, the arc starting electrode can withstand the ablation of multiple power frequency arcs, and the performance is reliable.

6. It is suitable for 35kV overhead power distribution lines to prevent lightning and disconnection accidents of insulated conductors.

Description of drawings

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

Figure 2 is an outline view of the arc starting electrode.

Figure 3 is an outline drawing of a zinc oxide arrester.

Fig. 4 is an outline view of the arc starting electrode connector.

Fig. 5 is an outline view of a Z-shaped connector.

Fig. 6 is an outline view of the supporting cross arm.

Fig. 7 is an outline view of the fixing clip.

In the figure: 1-arc electrode; 1.1-discharge plate (discharge surface); 1.2-fixing screw hole; 1.3-nut hole; 1.4-cylinder.

2-zinc oxide arrester; 2.1-high pressure end screw; 2.2-fixing screw; 2.3-compression nut; 2.4-composite jacket; 2.5-zinc oxide valve;

3-Arc strike electrode connector; 3.1——fixing screw hole; 3.2——fixing screw hole.

4-Z-shaped connector; 4.1——fixing screw hole; 4.2——fixing screw hole; 4.3——supporting screw hole; 4.4——supporting screw hole.

5-support cross-arm; 5.1-support screw; 5.2-support screw; 5.3-fixing screw; 5.4-fixing screw; 5.5-fixing screw; 5.6-fixing screw.

6-fixing clip; 6.1——fixing screw hole; 6.2——fixing screw hole; 6.3——fixing screw hole; 6.4——fixing screw hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment detailed description:

1. Overall structure

As shown in Figure 1, the lightning strike protection device for a 35kV line straight tower includes an arc striking electrode 1, a zinc oxide arrester 2, an arc striking electrode connecting piece 3, a Z-shaped connecting piece 4, a supporting cross arm 5 and a fixing clip 6; The arc electrode 1 is fixedly connected with the high-voltage end screw 2.1 of the zinc oxide arrester 2 by the arc-starting electrode connector 3 (it is fixedly connected by the fixed screw 2.2 on the high-voltage end screw 2.1, forming an 80mm discharge between the transmission line and the zinc oxide arrester 2 gap, providing a lightning flashover channel); one end of the Z-shaped connector 4 is fixedly connected to the low-voltage end screw 2.7 of the zinc oxide arrester 2 (fixed by the fixed screw 2.2 on the low-voltage end screw), and the other end of the Z-shaped connector 4 It is fixedly connected with one end of the supporting cross-arm 5 (such as by bolts); the other end of the supporting cross-arm 5 is fixed with at least 2 bolts and the fixing clip 6 to form a clip [the clip fixes the device on the 35kV line straight line The tower (or 35KV high-voltage iron tower, line pole tower) is suspended on the cross arm of the insulator (the insulator supports the cross arm), and the transmission wire is placed on one end of the insulator].

2. The structure of each part

1. Arc striking electrode 1,

As shown in Figure 2, the arc starting electrode 1 is a "T"-shaped structure formed by fixed connection (such as welding) of a horizontally placed arc-shaped discharge plate (discharge surface) 1.1 and a vertically placed cylinder 1.4. A fixing screw hole 1.2 and a nut hole 1.3 are arranged from top to bottom in the middle of the cylinder 1.4.

The fixed screw hole 1.2 can fix the arc pilot electrode 1 on the fixed screw hole 3.1 of the arc pilot electrode connector with the screw rod, and at the same time install the arc pilot electrode 1 firmly; On the discharge plate (discharge surface) 1.1, a discharge gap between the transmission line and the zinc oxide arrester 2 is formed.

2. Zinc oxide arrester 2,

The zinc oxide arrester 2 adopts the finished arrester that complies with the two standards of JB/T 8952-2005 "Composite Metal Oxide Arrester for AC System" and GB11032-2000 "Gapless Metal Oxide Arrester for AC".

As shown in Figure 3, the zinc oxide arrester 2 includes a high-voltage end screw 2.1, a fixed screw 2.2, a compression nut 2.3, a composite jacket 2.4, a zinc oxide valve plate 2.5, a composite jacket 2.6 and a low-pressure end screw 2.7.

The composite jacket 2.4 and the composite jacket 2.6 provide the outer insulation of the zinc oxide arrester 2 to ensure sufficient insulation strength;

The zinc oxide valve plate 2.5 is placed in the center of the zinc oxide arrester 2, which can limit the lightning overvoltage and cut off the power frequency freewheeling.

3. Arc striking electrode connector 3,

As shown in Figure 4, the arc starting electrode connector 3 is made of 50*50 finished angle steel, cut to a length of 50mm, the surface is treated with hot-dip galvanizing, and the two ends of the angle steel are respectively provided with Φ13.5 Fixing screw hole (round hole) 3.1, fixing screw hole (round hole) 3.2, wherein fixing screw hole 3.1 fixes the arc striking electrode 1 above it with a screw; Connect the arc electrode 1 and tighten the compression nut 2.3.

This structure makes the arc electrode 1 and the high voltage end of the zinc oxide arrester 2 firmly connected.

4. Z-shaped connector 4

As shown in Figure 5, the Z-shaped connector 4 is a Z-shaped structure with circular fixed screw holes 4.1, fixed screw holes 4.2, support screw holes 4.3, and support screw holes 4.4 at both ends. Made of 6mm cast iron steel, the surface of the steel is hot-dip galvanized.

The fixed screw hole 4.1 and the fixed screw hole 4.2 at one end of the Z-shaped connector 4 are fixed to the fixed screw 2.2 of the low-voltage end of the zinc oxide arrester 2 with a screw; the other end supports the screw hole 4.3 and the support screw hole 4.4. On the supporting screw hole 5.1 and the supporting screw hole 5.2 of the cross arm 5.

This structure is used to support the device.

5. Support cross arm 5,

As shown in Figure 6, the supporting cross-arm is cut and welded into the shape of Figure 6 with 40*40 finished angle steel, and the surface is treated with hot-dip galvanizing.

The support screw hole 5.1 and the support screw hole 5.2 of one end of the support cross-arm are fixedly connected with the support screw hole 4.3 and the support screw hole 4.4 of the Z-shaped connector; Hole 5.5 and fixing screw hole 5.6 are fixed on the insulator support cross-arm of 35KV high-voltage iron tower with screw rod respectively with fixing screw hole 6.1, fixing screw hole 6.2, fixing screw hole 6.3 and fixing screw hole 6.4 of fixing clip 6.

This structure first fixes the device, and then provides a discharge channel for lightning waves, and plays a role in preventing disconnection due to lightning strikes.

6. Fixing clip 6,

As shown in Figure 7, the fixing clip is cut into the shape of Figure 7 with 40*40 finished angle steel, and the surface is treated with hot-dip galvanizing.

Fixing screw hole 6.1, fixing screw hole 6.2, fixing screw hole 6.3 and fixing screw hole 6.4 of fixing clip 6 are respectively connected with fixing screw hole 5.3, fixing screw hole 5.4, fixing screw hole 5.5 and fixing screw hole 5.6 of support cross arm 5 Fix the device on the insulator support cross arm of the 35KV high voltage iron tower with screw rods.

This structure is to play a fixed role.

The working principle of the utility model is:

Due to the high amplitude of lightning overvoltage and short discharge time of 35kV overhead distribution lines, lightning overvoltage can cause flashover of insulators, and form power frequency continuous current on the lightning flashover channel to burn the transmission wire.

When the power grid is in normal operation, because the arc striking electrode forms a discharge gap (80mm) between the transmission wire and the zinc oxide arrester, the power frequency voltage is isolated at this time, and the zinc oxide arrester body will not be affected by power frequency voltage, operating overvoltage, etc. The influence of the arrester increases the service life of the arrester; the low-voltage end of the arrester is naturally grounded, and there is no need to add additional grounding resistance to reduce the construction intensity.

The arc-starting electrode is designed in an arc shape, which can keep the gap between the lead wire and the arc-starting electrode from changing too much even when the wire swings, ensuring the stability of the discharge.

Under the action of lightning overvoltage, the arrester can effectively operate, limit the amplitude of lightning overvoltage and cut off the continuous current of power frequency, and prevent the occurrence of insulator flashover accidents; install the arrester in parallel on the side of the insulator through the supporting cross arm, and reasonably design the supporting cross arm Make the surge arrester and the transmission line form a proper series gap, and form an effective discharge channel through the series gap, so as to ensure that the zinc oxide arrester can avoid the operating overvoltage and can effectively operate under the lightning overvoltage.

It can be seen from the above technical scheme that when the 35kV overhead distribution line is struck by lightning, it can break through the discharge gap provided by the arc-triggering electrode, make the zinc oxide arrester operate, limit the lightning overvoltage below the flashover voltage of the insulator, and then pass the oxidation The zinc arrester cuts off the power frequency freewheeling, which can prevent the wire disconnection accident caused by the lightning flashover.

Claims (6)

1.35kV circuit tangent tower lightning Protection device is characterized in that it comprises arc electrode (1), zinc oxide arrester (2), arc electrode connector (3), Z-shaped connector (4), supports cross-arm (5) and fixed clip (6); Arc electrode (1) is fixedlyed connected with the high-pressure side screw rod of zinc oxide arrester (2) by arc electrode connector (3); One end of Z-shaped connector (4) is fixedlyed connected with the low-pressure end screw rod of zinc oxide arrester (2), and the other end of Z-shaped connector (4) is fixedlyed connected with an end that supports cross-arm (5); The other end of support cross-arm (5) is fixed by 2 bolts and fixed clip (6) at least and is formed a folder.

2. 35kV circuit tangent tower lightning Protection device according to claim 1, it is characterized in that: described arc electrode (1) is a kind of "T"-shaped structure that is formed by fixedly connecting by the discharge electrode that is cambered surface (1.1) of horizontal placement and the vertical cylinder of placing (1.4), and the centre of cylinder (1.4) is provided with fixing threaded hole (1.2) and nut bore (1.3) from top to bottom.

3. 35kV circuit tangent tower lightning Protection device according to claim 1, it is characterized in that: described arc electrode connector (3) is an angle steel, and the middle position, two ends of arc electrode connector (3) is respectively arranged with fixing threaded hole.

4. 35kV circuit tangent tower lightning Protection device according to claim 1, it is characterized in that: described Z-shaped connector (4) is Z-shaped structure, one end of Z-shaped connector (4) is provided with 2 fixing threaded holes, and the other end of Z-shaped connector (4) is provided with 2 and supports screw.

5. 35kV circuit tangent tower lightning Protection device according to claim 1 is characterized in that: an end of described support cross-arm (5) is provided with 2 and supports screw; The other end that supports cross-arm (5) is provided with 4 fixing threaded holes.

6. 35kV circuit tangent tower lightning Protection device according to claim 1, it is characterized in that: described fixed clip (6) is provided with 4 fixing threaded holes.

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