JPS5843886B2 - Earthquake resistant transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant transformer, and more particularly to an earthquake-resistant transformer in which a dry type transformer including a molded transformer is designed to avoid seismic waves and resonance.

Generally, as shown in Figures 1 and 2, a dry type transformer including a molded transformer is constructed by combining an iron core 7 and a coil 8, and the iron core 7 is made of laminated silicon steel plates with a thickness of 1 m or less. The upper and lower ends are fastened and fixed from the outside by upper line fittings 9 and underline fittings 10, respectively.

The lower part of the underlined metal fitting 10 is the base 1 that fixes the transformer to the foundation.
It is fixed at 9.

When the floor on which the transformer 2 configured as described above is installed is struck by an earthquake motion shown in the direction of the arrow in Figure 2, the iron core γ, in which silicon steel plates are laminated, will cause flexural vibration in the lamination direction, and its natural frequency will change. is often below 10Hz.

Normally, the dominant frequency of seismic waves is in the range of 0.5 to 10 Hz, and if the natural frequency of the transformer 2 is in this range, a resonance phenomenon will occur and the foundation bolts will not receive a large load due to excessive response acceleration. There is a risk that the transformer 2 may break and fall, or the upper part of the transformer 2 may be excessively displaced, causing deformation of the connection leads.

In particular, transformers used in important power sources such as nuclear power plants are often required to have a natural frequency of 20 Hz or more.

Generally, the transformer 2 uses a laminated core 7 as a self-supporting core of the transformer 2 as shown in Fig. 2, but the bending rigidity in the lamination direction is affected by the thinness of the steel plates themselves and the slippage between the steel plates. Due to limitations on the vibration and tightening force, the natural frequency is much lower than when it is considered as a single piece, and the natural frequency is often around 10Hz.

An object of the present invention is to provide an earthquake-resistant transformer that can improve the earthquake resistance of dry type transformers including molded transformers.

When the seismic transformer of the present invention is configured with upper and lower fasteners that fix the top and bottom of both sides of the iron core around which the coil is wound, a plurality of horizontal fixing members are fixed to each side of each of the underlined fasteners. This horizontal fixing member and the upper wire fittings are connected and fixed by respective inclined stays.

In the past, as a means to suppress the shaking of the transformer,
As shown in Fig. 3, a stay 14 is provided on the tank side plate 13 of an oil-immersed transformer tank, which has a built-in coil 8 wound around an iron core 7 and is filled with insulating oil 12, and is provided with a stay 14 between it and the foundation. Some are attached with rubber 15 interposed therebetween.

However, since a dry type transformer does not have an oil tank, it is necessary to fix the contents of the transformer itself without using such means.

An embodiment of the seismic transformer of the present invention will be described below with reference to FIG. 4, where the same parts as those of the conventional one are denoted by the same reference numerals, and explanations of the same parts will be omitted.

Attachment fittings 11 are fixed to both ends of each upper wire fitting 9 that tightens both sides of the iron core 7, and interphase fittings 5 are protrudingly fixed to the interphase portions.

Horizontal fixing members 18 made of bases are fixed to the underlined metal fitting 10 at both ends and between the phases.

The horizontal fixing member 18 may also be used as the base or may be formed separately from the base.

-h Between the underlined metal fittings 9 and 10, the end stay 1 and interphase stay 6, which are installed obliquely on the side part, are fixed horizontally between the mounting metal fitting 11 and the horizontal fixing member 18 and with the interphase mounting metal fitting 5. Each tightening bolt 3 is arranged between the member 18 and the member 18.
, 4 are integrally fastened and fixed.

Therefore, the transformer 2 is reinforced and supported by inclined stays such as the end stays 1 and the interphase stays 6 without relying on the self-supporting cores 7 of each phase.

The seismic transformer of this example is constructed in this way, and by connecting and fixing the upper and lower fasteners at the lateral positions via the inclined stays, without changing the electrical characteristics of the standard transformer, Since the entire structure can be supported by a structure with much greater rigidity than the iron core, the natural frequency of the transformer can be increased to 20Hz or higher, making it completely unrelated to seismic waves or without resonance. be able to.

In addition, even if resonance were to occur, the response displacement would be small due to the high overall rigidity, and most of the seismic force would be borne by the end and phase stays, which are inclined stays, so excessive force would not be applied to the transformer. You can avoid it.

As described above, the earthquake-resistant transformer of the present invention has a plurality of horizontal fixing members fixed to the underlined metal fittings on both sides of the iron core, respectively.
Since the horizontal fixing members and the upper wire fittings on both sides are connected and fixed by the inclined stays, the earthquake resistance of dry type transformers including molded transformers can be improved.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional dry type transformer, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view of a conventional oil-immersed transformer with earthquake resistance, and Fig. 4 is a cross-sectional view of a conventional oil-immersed transformer with earthquake resistance. FIG. 1 is a perspective view of an embodiment of an earthquake-resistant transformer. 1...End stay 6...Interphase stay 7...Iron core, 8...Coil, 9...
... Upper line metal fitting, 10... Underline metal fitting, 18...
...Horizontal fixing member.

Claims (1)

[Claims] 1.In a device comprising an iron core, a coil wound around the iron core, and upper and lower fasteners that fix the upper and lower sides of both sides of the iron core, each of the underlined metal fittings has a plurality of horizontal fixing members fixed to each side thereof. An earthquake-resistant transformer characterized in that each of the horizontal fixing members and each of the upper wire fittings are connected and fixed by inclined stays.