Multi-ring tuned liquid damper based on ultra-high voltage composite casings and method thereof

A technology of tuning liquid damping and composite casing, applied in the direction of liquid shock absorber, shock absorber, shock absorber, etc., can solve the problems of increasing the stress at the root of the casing, increasing the displacement of the casing, low efficiency, etc., and achieves physical meaning. Clear, wide damping band effect

Active Publication Date: 2019-01-04
DALIAN UNIV OF TECH
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Problems solved by technology

However, the rigid constraint at the root of the casing will further increase the stress at the root of the casing, and will also increase the cost of the equipment
The third damping measure will significantly increase the displacement of the top of the bushing. If the displacement of the top of the bushin

Method used

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  • Multi-ring tuned liquid damper based on ultra-high voltage composite casings and method thereof
  • Multi-ring tuned liquid damper based on ultra-high voltage composite casings and method thereof
  • Multi-ring tuned liquid damper based on ultra-high voltage composite casings and method thereof

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0042] (1) Design of multi-ring tuned liquid damper

[0043] The 1100kV UHV composite bushing is selected, and its structure diagram is as follows figure 1 As shown, the mass of the structure is 5212kg. Using the finite element software ANSYS to conduct modal analysis, the fundamental frequency f of the structure is obtained s =0.841HZ.

[0044] The oil collecting box at the top of the 1100kV composite bushing provides an annular container with an inner radius of 0.048m and an outer radius of 0.37m. Structural damping ratio β s =2%, the frequency response curve of SDOF can be obtained by formula (1), set ATLD1, make f 11 = f s =0.841HZ, substituting formula (4) and (5) can obtain the corresponding liquid height h 1 = 0.143m. will h 1 Substituting into formula (6), the first-order sloshing mass m o...

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Abstract

The invention discloses a design method of multi-ring tuned liquid dampers based on ultra-high voltage composite casings, and belongs to the technical field of ultra-high voltage electrical engineering. In combination with the structural characteristics of the casings in the type, annular containers provided by oil collecting boxes at the tops of the casings are used for arranging the multi-ring tuned liquid dampers. The multi-ring tuned liquid dampers are obtained by optimizing the height of the oil collecting boxes, the radius of the oil collecting boxes and the height of liquid in the oil collecting boxes, and the purpose of damping is further achieved. The multi-ring tuned liquid dampers can provide a wide damping frequency band, and can be applied to damping design of the ultra-high voltage composite casings under different site conditions. According to the design method, the multi-ring tuned liquid dampers are designed based on a frequency response curve of a structure simplifying model, and reduces the corresponding peak value of the frequency response curve by setting ATLDj. The design method has a clear physical meaning and can quickly determine the number of the ring tuned liquid dampers for achieving the optimal damping effect.

Description

technical field [0001] The invention belongs to the field of ultra-high voltage electrical technology, and in particular relates to the vibration control technology of ultra-high voltage electrical equipment. Background technique [0002] UHV composite bushing is an important component in my country's UHV power grid. It plays the role of connecting the transformer body and external wires. Comparing with the traditional porcelain bushing, the composite bushing has the characteristics of good water repellency, small size and light weight. The bushing structure is usually fixed directly to the transformer top plate or to a raised stand where the transformer protrudes. As a long cantilever structure similar to a cantilever beam, the casing is extremely prone to damage under the action of an earthquake. Generally speaking, the transformer oil in the oil collection box on the top of the UHV composite bushing will reduce the fundamental frequency of the structure and increase th...

Claims

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Application Information

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IPC IPC(8): F16F9/10F16F9/32F16F9/50
CPCF16F9/10F16F9/3207F16F9/50
Inventor 李静岳红原陈健云徐强
Owner DALIAN UNIV OF TECH
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