A Spherical Tuned Liquid Damper for Reducing Dynamic Response of UHV Composite Casing

Abstract

The invention discloses a spherical tuned liquid damper for reducing the dynamic response of ultrahigh pressure composite casings, and belongs to the technical field of ultrahigh voltage electrical engineering. The structural characteristics of the ultrahigh pressure composite casings are used, and a spherical oil collecting box device is arranged on the top of each casing. Through optimized design of the radius of the spherical oil collecting box and the height of transformer oil in the spherical oil collecting box, the spherical tuned liquid damper is obtained. The height of the transformeroil injected into the spherical oil collecting box is further determined according to the sloshing characteristic of liquid in the spherical oil collecting box; and the radius r of the spherical oil collecting box is determined through the expression of the sloshing first-order frequency f1 of the liquid in the spherical oil collecting box. The sloshing characteristic of the transformer oil in thedamper is not affected by the placement angle, and the spherical tuned liquid damper can be applied to damping of the ultrahigh pressure composite casings at different standing angles.

Description

technical field [0001] The invention belongs to the field of ultra-high voltage electric technology, in particular relates to the vibration control technology of ultra-high voltage electrical equipment, in particular to a spherical tuned liquid damper for reducing the dynamic response of an ultra-high voltage composite bushing. 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 conduction. 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...

AI Technical Summary

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 bushing is too large, it will affect the adjacent equipment through the wires, which is not conducive to the safe operation of the entire substation equipment.

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