A double-swing anti-dancing device for overhead transmission lines and its application method

Abstract

The invention relates to a double pendulum dance preventer for overhead transmission lines and a method of use, which includes conductor clamps, small bolts, annular isolation rings, short connecting rods, a resonant pendulum damper, a parametric excitation pendulum damper, and conductor wires. One end of the clamp is fixed to the transmission conductor, and the other end is evenly fixed to the annular isolation ring through small bolts. The number of wire clamps matches the number of transmission lines; the annular isolation ring has several through holes evenly distributed at the bottom of the annular isolation ring. Two short connecting rods are set up. The angle between the two short connecting rods is α, and the symmetry axis of the short connecting rod passes through the center of the annular isolation ring. The bottom end of the short connecting rod is connected to the resonant pendulum shock absorber, and the resonant pendulum shock absorber surrounds it. The center of the split conductor swings back and forth to absorb the vibration energy of the transmission conductor and reduce the vibration of the transmission conductor. The advantage is that the resonant pendulum shock absorber and the parametric excitation pendulum shock absorber are combined to form an integral double pendulum anti-dancing device, which simultaneously damps horizontal vibration, vertical vibration and tilt vibration.

Description

technical field [0001] The invention belongs to the field of protection circuits of electric power transmission systems, and in particular relates to a double-swing dance preventer for overhead power transmission lines and a use method thereof. Background technique [0002] In the power transmission system, the safe operation of overhead transmission lines is very important. Under the action of wind, there are high-frequency vibration (ie breeze vibration), sub-gap vibration and low-frequency vibration (ie conductor galloping) vibration modes in overhead transmission lines. The galloping of overhead transmission lines refers to a low-frequency, large-amplitude self-excited vibration that occurs in a certain natural environment and is caused by the change of lift force generated by the wind on the asymmetric cross-section conductor. The frequency range is generally 0.1 to 1Hz, and the amplitude is from There are tens of centimeters to more than ten meters. Due to the long da...

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Problems solved by technology

Publication number: CN101944713A, discloses a split wire dance preventer, including: a bracket, a wire clip, a cylinder, a spring and a weight ball, and is characterized in that a cylinder is arranged on the bracket, and a spring and a matching ball are arranged inside the cylinder. Heavy ball, one end of the spring is connected with the counterweight ball, and the other end of the spring is connected with the cylinder; the invention adopts the spring mass system to dissipate energy to slow down galloping; the wire clamp is rotatably set, so that each sub-wire of the split wire can be automatically covered with ice. Adjust to balance the icing to eliminate galloping. This anti-dancing device is good for reducing vertical vibration, but it cannot achieve the best effect for reducing horizontal vibration and torsional vibration.

Publication number: CN103701079A, discloses a viscoelastic damping anti-dance device, including: connecting plate, upper end cover and lower end cover, piston, piston rod, damping ring and weight member, in the rectangular shell formed by the upper end cover and lower end cover , with a damping ring and a piston, one end of the piston rod is located in the casing and is fixedly connected to the piston, and the other end passes through the bottom of the casing and is installed with a ballast; when the transmission line dances, the ballast generates a corresponding Inertial impact force has a certain damping effect, but the damping ring and the weight will dance together with the transmission wire. Therefore, the vibration energy consumed by the deformation of the damping ring is relatively small, and the best effect cannot be achieved by reducing the dancing energy.

Publication number: CN201054486Y, discloses a dance preventer for splitting wires, including: a spacer, a swing rod and a pendulum, the pendulum is arranged at the lower end of the dance preventer, and the pendulum moves in the opposite direction to the swing direction of the wire due to inertia , to offset the swinging force, and effectively reduce the galloping frequency and reduce the galloping amplitude without generating centrifugal force; the anti-dancing device has a better effect on horizontal vibration damping, but can not achieve the best effect on vertical vibration damping

Although these anti-dance devices have a certain vibration reduction function, they cannot achieve the best vibration reduction effect for complex vibrations that include horizontal vibration, vertical vibration and torsional vibration.

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