CN203536907U - High voltage power transmission line wind deviation-resistant flexible insulation inhaul cable - Google Patents

Abstract

The utility model discloses a windproof flexible insulating cable for high-voltage transmission lines, which comprises a flexible rod body, the two ends of the flexible rod body are respectively connected with connecting fittings, and the flexible rod body includes a rod core located inside and an umbrella skirt located outside the rod core , The umbrella skirt is made of silicone rubber composite material, and the rod core is made of high-strength and load-bearing nylon material. It can effectively prevent the deflection of the wire to the tower under the action of strong wind, avoid the tripping of the line due to wind deflection, and improve the safe operation level of the transmission line.

Description

Windproof flexible insulating cable for high voltage transmission line

technical field

The utility model relates to the field of high-voltage transmission lines, in particular to a wind deflection flashover device for high-voltage transmission lines.

Background technique

The wind deflection of the transmission line refers to the phenomenon that the wire deviates under the action of the wind, resulting in insufficient insulation distance to the tower and flashover discharge. The success rate of closing is low due to the heavy wind of the line, which often causes serious consequences such as arc burns of conductors, broken strands, and disconnected wires. The wind deflection of transmission lines is one of the main factors affecting the safety of transmission lines, especially the frequent occurrence of wind deflection flashover accidents on 500kV transmission lines, which has caused great harm to the operation safety of transmission lines.

Overhead transmission lines run in the wild for a long time and are greatly affected by natural conditions and climate changes. When wind deflection occurs, it is usually accompanied by severe weather activities such as strong winds and thunderstorms, which makes it difficult to judge and find faults. At present, the common prevention and transformation measures are to install jumper strings or heavy hammers on the wires of the wind deflection fault, but the wind deflection effect of the wires is often unsatisfactory under these two methods of transformation. First of all, the wires with jumper strings are still prone to wind-bias tripping; second, the heavy hammer has a large surface area and is easy to go for a ride. When the strong wind blows to the hammer, it will cause wind-bias flashover. Thirdly, after installing heavy hammers on the conductors, each piece of the heavy hammers weighs several hundred kilograms, and the force of the conductors has a certain upper limit according to the design requirements, so an extra load is added to the tower. It is necessary to re-check the load of the tower, and at the same time, the design margin will be sacrificed for the tower, which will easily cause damage to the tower in strong winds, and in severe cases, the tower will be overturned and the line will be broken, resulting in more serious consequences than the wind deflection trip of the line, and the gain outweighs the gain; The cost of the hammer is high, the transportation is inconvenient, and the cost of transformation and installation is high.

Utility model content

The purpose of the utility model is to provide a high-voltage transmission line wind deflection flexible insulating cable, which can effectively prevent the discharge of the wire to the tower under the action of strong wind, avoid the wind deflection tripping of the line, and improve the safe operation level of the transmission line.

The technical scheme of the utility model is:

A windproof flexible insulating cable for high-voltage transmission lines, including a flexible rod body, the two ends of the flexible rod body are respectively connected with connecting fittings, the flexible rod body includes a rod core located inside and an umbrella skirt located outside the core, and the umbrella skirt is made of silicon Rubber composite material, the rod core is nylon material with high strength and load bearing.

The stay cable is installed on the tower body, the upper end of the stay cable is connected to the inner side of the wire hanging point on the tower body, the lower end of the stay cable is connected to the tower body below the wire hanging point, and the lower end of the stay cable is connected to the tower body surface and vertically The included angle α is in the range of 0 to 60 degrees.

When used in a tension tower, the three-phase wires of phase A, B and C are arranged vertically; the tension tower is provided with parallel upper, middle and lower cross-arms from top to bottom, and one end of the upper cross-arm is The wire hanging point, the wire hanging point is connected with the tension insulator string and the wire connected to the tension insulator string; the high-voltage end fittings at the upper end of the cable are installed at the lower part of the upper cross arm, and the high-voltage end fittings at the lower end of the cable are installed at the same The vertical deflection angle α of the upper end is within the range of 0 to 60 degrees where the upper part of the middle cross arm is located.

The high-voltage end fittings at the upper end of the second cable are connected to the lower part of the middle cross-arm, and the high-voltage end fittings at the lower end of the second cable are connected to the lower cross-arm within the range of 0 to 60 degrees in the vertical angle α from the upper end. within the upper range.

The high-voltage end fittings at the upper end of the third cable are installed at the lower part of the lower cross arm, and the high-voltage end fittings at the lower end of the third cable are connected to the tower where the vertical angle α is 0 to 60 degrees from the upper end. In the range.

When used in a linear tower, the three-phase wires of phase A, B, and C are arranged horizontally; from left to right on the straight tower, there are left, middle, and right cross-arms, and wire hanging points are provided at the cross-arms of each phase. Each wire hanging point is connected with a suspension insulator string and a wire connected to the suspension insulator string; four cables are used, the high-voltage end fittings at the upper end of the first cable are connected to the lower part of the left cross-arm, and the high-voltage end fittings at the lower end of the cables are It is connected on the side tower body surface within the range of 0~60 degrees with the vertical deflection angle α from the upper end; the upper ends of the second and third stay cables are symmetrically connected near the wire hanging point of the middle cross arm, the second, The lower end of the third cable is connected to the tower body surface and the tower window surface within the angle of 0~60 degrees with the vertical direction, and the lower ends of the second and third cables are symmetrically arranged on the conductor of the middle phase cross arm Both sides of the hanging point; the high-voltage end fittings at the upper end of the fourth cable are connected to the lower part of the right cross arm, and the high-voltage end fittings at the lower end of the cable are connected at the vertical angle α from the upper end within the range of 0 to 60 degrees. On the side of the tower.

The utility model comprises a flexible rod body and connecting fittings at both ends of the rod body. The surface layer of the rod body is a silicone rubber composite umbrella skirt, and the rod core is made of high-strength and load-bearing nylon material. By installing the windproof deflection flexible insulating cable at the appropriate position of the pole tower, it can prevent the deflection of the wire that endangers the safety of the line in the event of strong wind.

Advantage of the utility model:

First, it can effectively prevent the deflection of the wire against the tower under the action of strong winds, avoid tripping due to wind deflection of the line, and improve the safe operation level of the transmission line;

Second, the self-weight of the flexible rod is very light, so the extra load on the tower is very small, and there is no need to check the load of the tower;

Third, it is easy to install and modify, just punch holes in the tower body and install commonly used matching connecting fittings;

Fourth, it is the lightest and flexible among similar windproof products, so it can be placed in a coil and convenient for transportation; it is low in cost and high in cost performance.

Description of drawings

Fig. 1 is the structural representation of dragline of the present utility model;

Fig. 2 is the schematic diagram that dragline of the present utility model is installed in strain tower;

Fig. 3 is a schematic diagram of installation of the cable of the present invention on the linear tower.

Detailed ways

The utility model is applied to high-voltage transmission lines of all voltage levels prone to wind deviation, especially to 500kV high-voltage transmission lines.

As shown in Figure 1, the cable 1 of the utility model includes a flexible rod body 12, and the upper and lower ends of the flexible rod body 12 are respectively connected with high-voltage end fittings 11, and the flexible rod body 12 includes an umbrella skirt 13 and a rod core 14. The surface layer of the body 12 is an insulating shed 13, and the shed 13 is a silicone rubber composite material. The rod core 14 is located in the shed 13, and the rod core 14 is a high-strength bearing nylon material. The high-voltage end fittings 11 are used to connect with the tower body. When connecting and installing, you only need to punch holes on the tower body and install the commonly used matching connecting fittings, which is easy to operate.

As shown in Figure 2, take the single-circuit line of a 500kV double-circuit strain tower as an example for illustration. Phase A, phase B, and phase C are vertically arranged as three-phase conductors as shown in the figure. The upper cross arm 21, the middle cross arm 22 and the lower cross arm 23 of the tension tower are arranged in parallel from top to bottom (the top cross arm of the tension tower is the ground wire cross arm), and the right ends of the upper, middle and lower cross arms Both are connected with the tension insulator string 4 and the wire 5 connected to the tension insulator string 4 . The high-voltage end fitting 11 at the upper end of the cable 1 of the utility model is installed at the lower part of the upper cross arm 21, and is close to the wire hanging point, and the lower high-voltage end fitting 11 is installed at the upper part of the middle cross arm 22 (B phase cross arm). range of places. When the deflection angle of the tower is greater than 60 degrees when the wind deflection occurs, the insulation distance between it and the tower body is likely to be insufficient. Therefore, the lower end can be within the range of 0 to 60 degrees with the vertical deflection angle α (Fig. 2 within the range of m shown), and at the same time, an appropriate location can be selected for installation according to the actual situation. Take the N-direction wind shown by the arrow in the figure as an example. When the N-direction wind blows to the conductor 5, the conductor 5 will deflect toward the tower (wind deflection phenomenon occurs). At this time, if it is in strong wind and bad weather, it may cause the conductor 5 and the air insulation distance between the lower part of the left cross-arm 21 and the tower body where the tower body is located is not enough, thus a wind deflection flashover accident occurs. After the cable 1 of the utility model is installed, it can be seen that it lies between the wire and the tower body, preventing the wire from continuing to deflect toward the tower body, thereby ensuring sufficient air insulation distance and preventing the occurrence of wind deflection flashover accidents . In general, the higher the distance from the ground, the greater the wind speed, and the greater the probability of wind deflection. Therefore, the utility model is generally installed at the uppermost cross arm of the tower. If monitoring shows that the wind speed at the middle and lower cross-arms is relatively high, and wind deflection tripping accidents are likely to occur, it can also be installed at the middle cross-arm 22 and the lower cross-arm 23. According to the actual situation, the installation method is the same as that of the upper cross-arm 21. same place.

As shown in Figure 3, taking a 500kV straight tower as an example, phase A, phase B, and phase C are three-phase conductors arranged horizontally as shown in the figure. The cross arm of the straight tower comprises a left cross arm 24, a middle cross arm 25 and a right cross arm 26. The present embodiment adopts four stay cables 1 . Each is connected with a tension insulator string 4 and a wire 5 connected to the tension insulator string 4 .

The upper end of the first cable 1 of the utility model is installed at the lower part of the left cross arm 24, and is close to the hanging point of the wire. It is within the range of 0~60 degrees, and the appropriate position can be selected according to the actual situation. It can be seen that after installing the cable 1 of the utility model, it can effectively ensure the insulation distance to the tower body when the wire is deflected to the tower body direction. When installing near the B-phase (middle-phase) conductor, since it can be wind deflected to both sides, it should be installed on the two tower window surfaces 7 of the tower body, as shown in the figure, the second and third pull The upper ends of the cables 1 are respectively connected near the hanging points of the B-phase conductors of the middle cross arm 25, and the lower ends of the second and third two cables 1 are on the tower window surface 7 and the angle α with the vertical direction is 0~60 degrees. range (within the range of n shown in Figure 3) for installation. The lower ends of the second and third cables 1 are connected to the tower body surface 7 and installed on the tower window surface 7 within the range of 0~60 degrees with the vertical direction, and the lower ends of the second and third cables 1 are symmetrical Be located at the both sides of the wire hanging point of middle cross arm 25.

The C-phase conductor and the A-phase conductor of the right cross arm 26 are symmetrical, and the installation method of the A-phase conductor can be referred to.

The positions of the A-phase and C-phase conductors of the above-mentioned strain tower or linear tower can be interchanged as required.

To sum up, the utility model has a simple structure and an ingenious conception, which can effectively prevent the occurrence of wind deflection flashover accidents and ensure the safe operation of transmission lines.

Claims (6)

1. A kind of high-voltage transmission line windproof flexible insulating cable, it is characterized in that: comprise flexible rod body, the two ends of flexible rod body are respectively connected with connection fittings, flexible rod body comprises the rod core that is positioned at inside and the umbrella that is positioned at the outside of rod core The skirt and umbrella skirt are made of silicone rubber composite material, and the rod core is made of high-strength and load-bearing nylon material. 2. According to claim 1, the windproof flexible insulating cable of the high-voltage transmission line is characterized in that: the cable is installed on the tower body, the upper end of the cable is connected to the inner side of the wire hanging point on the tower body, and the lower end of the cable is connected to the On the tower body below the wire hanging point, the lower end of the cable is connected to the tower body and the angle α with the vertical direction is in the range of 0 to 60 degrees. 3. According to claim 2, the flexible insulating cable against wind deflection of the high-voltage transmission line is characterized in that: when used in a strain tower, the three-phase wires of A phase, B phase and C phase are arranged vertically; There are parallel upper, middle and lower cross-arms to the bottom, one end of the upper cross-arm is a wire hanging point, and the wire hanging point is connected with a tension insulator string and a wire connected to the tension insulator string; The high-voltage end fittings are installed at the lower part of the upper cross-arm, and the high-voltage end fittings at the lower end of the cable are installed within the range of the upper part of the middle cross-arm within the range of 0 to 60 degrees in the vertical angle α with the upper end. 4. According to claim 3, the high-voltage transmission line windproof flexible insulating cable is characterized in that: the high-voltage end fittings at the upper end of the second cable are connected to the lower part of the middle cross arm, and the high-voltage end at the lower end of the second cable is The fittings are connected within the range where the upper part of the lower cross arm is located within the range of 0 to 60 degrees in the vertical deflection angle α with the upper end. 5. According to claim 4, the high-voltage transmission line windproof deflection flexible insulating cable is characterized in that: the high-voltage end fittings at the upper end of the third cable are installed at the lower part of the lower cross arm, and the high-voltage end fittings at the lower end of the third cable It is connected to the range where the tower body is located within the range of 0-60 degrees with the vertical deflection angle α from the upper end. 6. According to claim 2, the high-voltage transmission line windproof flexible insulating cable is characterized in that: when used in a straight tower, the three-phase wires of A phase, B phase and C phase are arranged horizontally; on the straight tower from left to right They are the left, middle and right cross-arms respectively. There are wire hanging points at the cross-arms of each phase, and each wire hanging point is connected with a suspension insulator string and a wire connected to the suspension insulator string; The high-voltage end fittings at the upper end of the cables are connected to the lower part of the left cross arm, and the high-voltage end fittings at the lower end of the cables are connected to the lateral tower body surface within the range of 0 to 60 degrees in the vertical angle α from the upper end; Second, The upper end of the third cable is symmetrically connected near the wire hanging point of the middle cross arm, and the lower end of the second and third cable is connected to the tower body and the angle with the vertical direction is within the range of 0~60 degrees. On the window, the lower ends of the second and third cables are arranged symmetrically on both sides of the wire hanging point of the middle phase cross-arm; The high-voltage end fittings are connected to the lateral tower body surface within the range of 0 to 60 degrees with the vertical deviation angle α from the upper end.

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