JPH04280408A - Earthquake-proof structure of transformer equipment - Google Patents

Abstract

PURPOSE:To obtain an earthquake-proof structure of a transformer equipment with a stable earthquake-proof performance by placing a vibration-controlling body with a built-in viscosity fluid at least at one part of a bushing head, near the head, or the root of the head. CONSTITUTION:A busing 3 and an expansion chamber 4 are placed through a bushing pocket 2 which is provided on an upper portion of a transformer main unit 1 and a vibration-controlling body 8 is fixed to a mounting seat 11 which is provided at an upper portion of this expansion chamber 4. This vibration-controlling body 8 is in a structure to be placed outside the expansion chamber 4. Also, the vibration-controlling chamber 8 is in a circular pipe shape which is partially cut off and the section is constituted by a container 9 where the inside is divided into small sections. A viscous fluid 10 is filled into each section within the container 9. A natural frequency of the vibration-controlling body 8 is matched with that of the bushing 3. Therefore, by mounting the vibration-controlling body 8 at a head portion of the bushing 3, a maximum response acceleration at the head portion of the bushing 3 can be reduced by approximately 60% as compared with a case when there is no vibration- controlling body 8.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-resistant structure for substation equipment equipped with bushings.

0003

[Prior Art] Conventionally, in order to protect substation equipment from disasters caused by vibrations such as earthquakes, a method of seismically isolating the entire equipment has been used (Fujita et al., Seismic isolation support, Transactions of the Japan Society of Mechanical Engineers, 50-454,
C (Sho 59-6). reference).

A transformer will be described below with reference to FIG. 7 as an example of substation equipment having a seismic isolation structure. As shown in Figure 7,
A bushing 3 and an expansion chamber 4 are provided in the transformer body 1 via a bushing pocket 2, and the expansion chamber 4 is further provided with a bushing 3 and an expansion chamber 4.
A terminal 7 is attached to the upper part of the terminal. If a seismic isolation device 5 made of laminated rubber or the like is provided between the entire transformer constructed in this manner and the foundation 6, the transformer can be protected from vibrations during an earthquake. In this way, a transformer structure equipped with a seismic isolation device can reduce the response acceleration of equipment. For this purpose, it is necessary to suppress the natural frequency of the system consisting of the transformer and the seismic isolation device to about 0.5 Hz.

[0005]

As described above, in a transformer equipped with a conventional seismic isolation device, although the response acceleration of the equipment during an earthquake is reduced, the relative displacement with the foundation becomes large. Therefore, in order to prevent collisions and tensions at the connections with peripheral equipment, it is necessary to create a structure that allows large displacements at the connections.Furthermore, when seismically isolating the entire existing transformer, it is necessary to The problem was that it had to be stopped for a long period of time.

The present invention has been made in consideration of the above points, and its object is to provide an earthquake-resistant structure for substation equipment that has stable earthquake-resistant performance. [Structure of the invention]

[0007]

[Means for Solving the Problems] In order to achieve the above object, the earthquake-resistant structure of the substation equipment of the present invention is such that, in the substation equipment equipped with a bushing, at least one location at the head, near the head, or at the base of the bushing is provided. It is characterized by a damping body containing a viscous fluid.

[0008]

[Function] According to the earthquake-resistant structure of the substation equipment of the present invention, it is possible to reduce the vibration of the bushing body and also to reduce the relative displacement with peripheral equipment.

[0009]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a side view of one embodiment of the present invention. As shown in FIG. 1, a bushing 3 and an expansion chamber 4 are disposed through a bushing pocket 2 provided at the top of a transformer body 1. A damping body 8 is mounted on a mounting seat 11 provided at the upper part of this expansion chamber 4.
is fixed, and this vibration damper 8 is arranged outside the expansion chamber 4. As shown in FIG. 4, this damping body 8 has a circular tube shape with a portion cut away, and its cross section is composed of a container 9 whose interior is divided into small sections as shown in FIG. Each compartment within the container 9 is filled with a viscous fluid 10.

Next, the operation of this embodiment will be explained. In this embodiment, the natural frequency of the damper 8 is made to match the natural frequency of the bushing 3. Such a system is
It can be modeled using a two-degree-of-freedom system as shown in FIG. Here, m: mass, k: spring constant, c: damping constant,
x: displacement, y: base displacement, subscript 1 is bushing, subscript 2
represents a damping body.

The frequency response characteristics of such a system can be shown by curves a or b in FIG. In the figure, curve a represents the response when there is no damper, and curve b represents the response when the vibration damper is installed. However, the frequency f is made dimensionless by the natural frequency f1 of the bushing, and the response acceleration ddz1 /
dt2 (=ddx1 /dt2 -ddy/dt2
) is made dimensionless by the maximum acceleration.

Therefore, by attaching the vibration damping body to the bushing head as in this embodiment, the maximum response acceleration of the bushing head can be reduced to about 60% of that without the vibration damping body. Compared to the case where the entire structure is seismically isolated, the relative displacement with peripheral equipment can be smaller. Furthermore, compared to the case where the entire existing transformer is seismically isolated, there is no need to lift the entire transformer, so there is an advantage that the period during which the equipment is out of operation can be significantly shortened.

FIG. 6 is a side view of another embodiment of the invention. This embodiment differs from the above embodiments only in that the damping body 8 is disposed at the base of the bushing 3, and has the same effects as the above embodiments. Further, even if a small section as shown in FIG. 5 is formed on the inner surface of the expansion chamber 4 above the bushing 3 and filled with the viscous fluid 10, the same effect as in the above embodiment can be obtained.

[0014]

[Effects of the Invention] As explained above, according to the present invention, in a substation device equipped with a bushing, a damping body containing a viscous fluid is provided at the head of the bushing, near the head, or at the root of the bushing. This has the effect of not only reducing the vibration of existing transformers, but also shortening the outage period when improving the seismic performance of substation equipment equipped with bushings, such as existing transformers.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the characteristics of the present invention.

FIG. 3 is an explanatory diagram showing the characteristics of the present invention.

FIG. 4 is a plan view of a damping body according to the present invention.

FIG. 5 is a sectional view of a damping body according to the present invention.

FIG. 6 is a side view of another embodiment of the invention.

FIG. 7 is a side view of a transformer with a conventional bushing.

[Explanation of symbols]

1... Transformer body, 2... Bushing pocket, 3... Bushing, 4... Expansion chamber, 5... Seismic isolation device, 6... Foundation, 7... Terminal, 8... Vibration damper, 9... Container, 10... Viscous fluid, 11 ...Mounting seat.

Claims (1)

[Claims] 1. Earthquake resistance of a substation device equipped with a bushing, characterized in that a damping body containing a viscous fluid is disposed at at least one of the head, the vicinity of the head, or the base of the bushing. structure.