JPS6149809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to stationary induction electric appliances such as transformers and reactors, and more particularly to stationary induction electric appliances that can improve seismic strength.

[Conventional technology]

Usually, stationary induction electrical equipment such as transformers and reactors are installed on the foundation surface with sufficient consideration given to seismic strength.

This will be further explained using the example of the transformer shown in FIGS. 1A and 1B. Generally, at the time of installation, a transformer is fixed in a predetermined position within a foundation 1 with reinforcing bars 2 and installed on a pre-provided embedded fitting 3. These transformers include an iron core 11 around which 22 and 23 are wound, for example, in an oil tank 4 consisting of a tank part 4a and a cover 19.
This is fixed by a lower clamping fitting 14 using a pin 13 provided at the bottom of the oil tank 4 that fits into the iron core stand 12. The fastener 14 is connected to the iron core 11
The upper part of the core is fixed by a leg abutment plate 15 and a connecting pin 16, and the upper part of the core is tightened by an upper fastener 17 and a connecting member 18. This connecting fitting 18 is provided with a connecting pin 21 and is connected to a fixing hole 20 provided on the top or side surface of the cover 19. An anti-vibration fitting is provided in this portion to separately fix the iron core 11 and the tank 4a. The tank portion 4a is provided with a horizontal reinforcing beam 5 having a U-shaped cross section, for example, for both vacuum resistance and transportation purposes for insulation treatment, and a beam bottom plate 7a and a beam bottom plate 7a at the bottom of the tank portion 4a. A bottom beam 6, usually referred to as a base, is provided at the beam vertical plate 7b and has an inverted T-shaped cross section.

This part of the bottom beam 6 is located on the embedded metal fitting 3, and after installing the oil tank 4 on the embedded metal fitting 3, the part between the built-in metal fitting 3 and the bottom beam 6 of the tank part 4a is It is fixed by welding or bolts using earthquake-proof fixing fittings 8, 9, and 10.

In this way, the oil tank 4 and the foundation 1 and the oil tank 4 and the contents of the transformer are fixed.

[Problem that the invention seeks to solve]

However, transformers, which are stationary induction electric devices, are generally transported by rail, and in this case, platform A on the railway is located near the lower horizontal reinforcing beam 5, and in the case of large capacity transformers, the outer winding 23
has a large diameter and it is necessary to maintain insulation between it and the oil tank 4. Therefore, only the side plate of the tank portion 4a exists between the horizontal reinforcing beam 5 and the bottom beam 6, which is a weak point in terms of strength. In particular, in response to earthquake-resistant vibrations, the low rigidity of this part amplifies the vibration of the entire oil tank 4, and for example, a bushing pulled out from the side of the cover 19 is subjected to a greater stress than the bushing itself. There was a fear that it would cause vibrations.

An object of the present invention is to provide a stationary induction electric appliance that can further improve mechanical properties by increasing seismic strength.

[Means for solving problems]

In order to achieve the above object, in the stationary induction electric appliance of the present invention, an electric oil tank having a bottom beam at the bottom and at least one horizontal reinforcing beam at the side is installed on an embedded metal fitting provided on the foundation surface. During installation, the bottom beam of the electrical oil tank and at least the adjacent horizontal reinforcing beams are welded and fixed together using earthquake-resistant metal fittings, and the earthquake-resistant metal fittings have an extended end surface at the lower end. , which is fixed by welding to the embedded metal fittings on the foundation surface.

[Effect]

When installing an electrical oil tank installed on the foundation surface, the bottom beam, at least the adjacent horizontal reinforcing beam, and the embedded metal fittings are welded together using earthquake-resistant metal fittings, so it is earthquake-resistant. Strength can be increased to improve mechanical strength.

〔Example〕

The present invention will be explained below using the embodiment shown in FIGS. 2A and 2B.

The electric appliance oil tank 30 is formed of, for example, a tank part 31 and a cover in the same way as in the past, and stores the contents of the electric appliance (not shown), and is fixed in the foundation 1 with a reinforcing bar 2 or the like, and is attached to a pre-installed embedded metal fitting. 3. Install on top. Lateral reinforcing beams 33 and 34 are provided on the side surfaces of the tank portion 31, and connecting beams are provided as necessary to ensure sufficient strength. Further, a bottom beam 36, usually called a base, is fixed to the bottom plate 32 of the tank portion 31, and this portion is placed on the embedded fitting 3.

When the oil tank 30 placed on the embedded metal fitting 3 of the foundation 1 is placed and fixed, seismic metal fittings 37 and 38 are welded and fixed to the bottom of the oil tank 30 as described later to improve seismic strength. I have to. Earthquake-resistant metal fittings 3
7 and 38 are formed so that the cross-sectional shape is H-shaped in this example, but the shape can be determined as appropriate. This earthquake-resistant metal fittings 37, 38
The extended end face part of the lower end is fixed to the embedded fitting 3 by welding 39, and the horizontal reinforcing beam 3 located on the other end side
3. A portion of the side surface of the tank portion 31 and the bottom beam 36 are similarly firmly fixed by welding 40.

In the example shown in Fig. 2, the earthquake-resistant metal fittings 37 and 38 extend to the surface of the lower horizontal reinforcing beam 33, but they can be further extended to the upper horizontal reinforcing beam 34, and the connecting beam 35 can be omitted. You can also do it. In addition, this earthquake-resistant metal fittings 3
The surfaces 7 and 38 can also be used as a stand for the cooler.

The seismic metal fittings 37 and 38 are fixed by welding 39 and 40 to the horizontal reinforcing beams 33, the bottom beam 36, and the embedded metal fittings when the stationary induction electric appliance is transported by rail and installed on the foundation 1. Fix the three parts in an earthquake-resistant manner.

〔Effect of the invention〕

With the structure of the present invention, even if stationary induction electric appliances are subject to restrictions due to railway transportation, etc., the rigidity of the bottom of the electric appliance oil tank can be significantly increased by utilizing seismic metal fittings that are fixed during installation, thereby improving seismic strength. This has the effect of improving mechanical properties. Therefore, the response multiplier of the oil tank to vibrations such as earthquakes can be lowered, and the excitation force applied to the bushing etc. is also reduced. Furthermore, since the bottom beam of the oil tank, the horizontal reinforcing beam, and the embedded metal fittings are connected by seismic metal fittings during installation, the seismic strength can be further improved, and fixing metal fittings can be omitted.

[Brief explanation of the drawing]

Figure 1A is a vertical sectional view showing a conventional transformer;
Figure B is a partial front view of A, Figure 2 A is a vertical sectional view showing a transformer that is an embodiment of the present invention, and Figure 2 B is a partial front view of A.
FIG. 1...Foundation, 3...Embedded metal fittings, 30...Electrical oil tank, 33, 34...Horizontal reinforcement beam, 36...Bottom beam, 3
7, 38... Earthquake-resistant metal fittings, 39, 40... Welding.

Claims (1)

[Claims] 1. A bottom beam is provided at the bottom of the appliance oil tank, and at least one horizontal reinforcing beam is provided on the side, and the appliance oil tank containing the contents of the appliance is installed and fixed on the embedded metal fittings that have been installed in advance on the foundation surface. The bottom beam of the electrical oil tank and at least the adjacent horizontal reinforcing beams are connected by seismic metal fittings that are welded and fixed during installation, and the seismic metal fittings have an extended lower end thereof connected to the foundation surface. A stationary induction electric appliance characterized by being fixed by welding to an embedded metal fitting.