Rotary and rapid elastic releaser and design method thereof

Abstract

The rotation amplitude and frequency of a wire are measured by an MEMS inertia measurement system, a structure and damping parameters of a releaser are further designed according to the rotation amplitude and frequency and the damping parameters mainly comprise an elastic coefficient of a torsional spring, the length of the torsional spring, the pitch number (the order number represents an n-orderdamper), the mass and the material, a rotary and rapid elastic releaser is further designed. The rotary and rapid elastic releaser comprises an outer shell cylinder, bolts, sealing rings, support bearings, torsional springs, a rolling bearing and a sleeve, wherein a working principle of the rotary and rapid elastic releaser is in a way that rotation energy of the wire is converted to elastic potential energy of the torsional spring, the elastic potential energy is released in a non-oscillation way, the torsional elastic potential energy cannot be returned back to the wire, and an energy release curve of the wire is a single curve with large negative slope. The rotary and rapid elastic releaser is simple in structure, the rotation motion energy of the wire can be particularly and rapidly released, oscillation cannot be generated, and the rotary and rapid elastic releaser is good in stability and has relatively long service lifetime and high application value.

Description

technical field [0001] The invention belongs to the technical safety field of power grid line movement, and in particular relates to a fast elastic releaser for transmission wire rotation and a design method thereof. Background technique [0002] Under the influence of different climatic conditions, transmission lines, especially UHV transmission lines, will have different motion amplitudes and frequencies, mainly high-frequency slight-amplitude breeze vibration, medium-frequency and medium-amplitude sub-gap oscillation, and low-frequency large-amplitude galloping Generally speaking, the movement of transmission wires includes three-degree-of-freedom movements such as horizontal, vertical, and rotation. The initial movement of the wires is a slight vibration near the equilibrium position. , changes from horizontal vibration to vertical vibration, and gradually tends to a certain state of motion, but when the amplitude and rotation reach a certain level, a low-frequency, larg...

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Problems solved by technology

[0002] Under the influence of different climatic conditions, transmission lines, especially UHV transmission lines, will have different motion amplitudes and frequencies, mainly high-frequency slight-amplitude breeze vibration, medium-frequency and medium-amplitude sub-gap oscillation, and low-frequency large-amplitude galloping Generally speaking, the movement of transmission wires includes three-degree-of-freedom movements such as horizontal, vertical, and rotation. The initial movement of the wires is a slight vibration near the equilibrium position. , changes from horizontal vibration to vertical vibration, and gradually tends to a certain state of motion, but when the amplitude and rotation reach a certain level, a low-frequency, large-amplitude galloping mainly in the vertical direction is formed, and the galloping increases the sag of the conductor, The axial stress increases and the fatigue limit decreases, which can easily lead to wire breakage; at the same time, the load on the insulator string, cross arm and tower will increase, causing serious disasters such as insulator swing, cross arm deformation, and tower tilting, which pose a threat to the safe and stable operation of the power grid. Great threat, will also directly cause losses to the national economy

[0003] Existing wire movement dampers or releasers have their own advantages and disadvantages: double pendulum damper releasers are suitable for split wires, easy to install, and have better anti-dancing effect; interphase spacers can be applied to transmission lines with voltage levels of 220kV and below, or higher Compact lines with high voltage levels have problems such as aging, discharge, and bending, and the large-amplitude damping effect is better; the turbulence damping releaser is mainly used in areas with thin ice, and it is more used on single wires than split wires. The anti-dancing device is light in weight, easy to install, and has the problems of aging and deterioration; the eccentric weight is suitable for splitting the wire, pay attention to the influence of the breeze vibration, and the anti-vibration effect is better; The application of the pressure damper needs to be studied; the pressure damper is convenient to obtain materials, can suppress the breeze vibration, has a large degree of freedom, and is prone to disturbance; the wire clip rotary spacer has a good anti-vibration effect and will not have a negative impact on the line. Rods are more expensive than ordinary spacers

Due to the complexity of the wire motion problem, the existing commonly used motion damping devices have their pertinence in design and limitations in use. The existing dampers all have a common shortcoming, the motion energy of the wire cannot be fully If it is released quickly, some parts will return to the conductor, causing mutual interference movement, and even accelerating the damage to the transmission line

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