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Structure for preventing flashover of power transmission circuit caused by windage yaw

A flashover structure and transmission line technology, which is applied in the field of preventing wind deflection flashover of transmission lines, preventing wind deflection flashover of insulator strings suspended by linear towers, and can solve the problem of increasing the vertical load of insulator strings and unsatisfactory actual effects, etc. It can achieve the effect of good windproof effect, suppress horizontal and torsional vibration, and reduce torque.

Inactive Publication Date: 2012-02-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to prevent the wind deflection flashover of the transmission line, it is often adopted to install a weight under the suspension line clamp of the straight line tower or other methods to increase the vertical load of the insulator string. In essence, the galloping or torsional swing of the wire that causes the wind deflection is not suppressed from the source. The effect is not ideal

Method used

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  • Structure for preventing flashover of power transmission circuit caused by windage yaw
  • Structure for preventing flashover of power transmission circuit caused by windage yaw
  • Structure for preventing flashover of power transmission circuit caused by windage yaw

Examples

Experimental program
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Effect test

Embodiment 1

[0032] figure 1 It is a structural schematic diagram of Embodiment 1 of the method for preventing wind deflection flashover of transmission lines according to the present invention.

[0033] Such as figure 1 As shown, damping spacers 4, 5 are installed and fixed on the conductors 2 and 3 at a distance of 500 mm from the left and right sides of the suspension insulator string 1, and the left and right clamps 6 and 7 are respectively installed on the left and right conductors 2.0 m away from the suspension insulator string. Above, a damping system is provided between or on both sides of the wires of the suspension insulator string, that is, a damper system 8 is provided between the left and right wire clamps, and the damping system and the left and right wire clamps are hinged through a pull rod 9 Connection: The fitting at the end of the suspension insulator string 1 is provided with a "T"-shaped end 10, and the "T"-shaped end 10 is provided with a bolt hole 12 for connecting ...

Embodiment 2

[0038] figure 2 It is a structural schematic diagram of Embodiment 2 of the method for preventing wind deflection flashover of transmission lines in the present invention.

[0039] The non-damping spacer bars 4 and 5 are respectively fixed on the conductors 2 and 3 with a distance of 800mm between the left and right sides of the suspension insulator string 1, and the left and right wire clamps 6 and 7 are respectively installed on the left and right conductors 2 and 3 at a distance of 2.5m from the suspension insulator string 1. 3. The damping system 8 is hinged to the left and right clamps 5 and 6 through the pull rod 9. The fittings at the end of the insulator string 9 are provided with a "T"-shaped end 10, and the "T"-shaped end 10 is opened for connection with the iron tower cross arm 11. 12 bolt holes.

[0040] The damping system is a composite damping system composed of three spring dampers in series and parallel with air dampers, as shown in the attached Figure 7 sh...

Embodiment 3

[0043] image 3 It is a structural schematic diagram of Embodiment 3 of the method for preventing transmission line wind deflection flashover according to the present invention.

[0044] On the conductors 1 and 2 on the left and right sides of the suspension insulator string 1, fix two pairs of damping systems consisting of clamps 5 and 6 and a damping system 8 respectively, and the distance between the two pairs of damping systems is 2.5m.

[0045]The damping system is a viscoelastic damper, an air damper or a spring damper, e.g. Figure 8-Figure 10 , or a composite damping system composed of them juxtaposed.

[0046] The structures of the clamps 5, 6 and the ends of the insulator strings are the same as in the first embodiment.

[0047] The spacer bars 4, 5, clamps 6, 7 and insulator string end fittings "T" shaped end 10 described in the first to third embodiments above can be manufactured by general machining or casting methods, and various dampers It can also be manufac...

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Abstract

The invention provides a structure for preventing flashover of a power transmission circuit caused by windage yaw. The method is characterized in that: insulating bars (4, 5) and wire clips (6, 7) are arranged on conductors (2, 3) on the left and right of a suspension string (1) respectively; a damping system (8) is arranged between the wire clips (6, 7), and is hinged with the wire clips (6, 7) through a pull rod (9) for absorbing the vibration energy of the conductors on two sides, so that the aim of inhibiting horizontal and torsional vibration of the conductors is achieved; and a T-shaped tip (10) is arranged on the hardware at the end of the suspension string (1), and is provided with a bolt hole (12) which is used for connecting a tower crossarm (11) to enlarge the contact surface of connection, so that the suspension string and the tower crossarm are connected stably, and the toque is reduced. According to the structure, the vibration energy of the conductors can be effectively absorbed, the torque generated by galloping of conductors to the end of the suspension string is effectively reduced, and the windage yaw trend of the suspension string is reduced. The structure has the advantages of simple structure, low cost, long service life, good windage yaw prevention effect and easiness in realization, and is suitable for the requirement of windage yaw prevention of the suspension string of a tangent tower of an overhead power transmission circuit.

Description

technical field [0001] The invention relates to a structure for preventing wind deflection flashover of a power transmission line, in particular to a method for preventing wind deflection flashover of a straight tower hanging insulator string, and belongs to the technical field of electric power overhead transmission line protection. Background technique [0002] In recent years, wind deflection flashover accidents of transmission lines caused by strong storms have increased significantly. Usually, reclosing is not easy after wind deflection flashover occurs, which has caused serious harm to the safe and stable operation of the power grid, and the occurrence of wind deflection is often accompanied by There are strong winds and thunderstorms, which bring great difficulties to the judgment and search of faults. [0003] Wind flashover is the reduction of the space gap distance between the conductor on the transmission line and the tower due to various external adverse conditio...

Claims

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Application Information

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IPC IPC(8): H02G7/14
Inventor 李鹏云张峰
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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