JPS607450Y2 - Low-noise oil-filled electrical equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to low-noise oil-filled electrical equipment, and particularly to the arrangement structure of an impact hydraulic relay in oil-filled electrical equipment with a conservator.

Generally, in oil-filled electrical equipment, when an accident occurs inside the equipment, the insulating oil decomposes due to electric arc or the like, and a large amount of gas is generated.

This generated gas causes abnormal pressure waves to rapidly propagate within the insulating oil.

In oil-filled electrical equipment with a conservator, an impact hydraulic relay is installed on the side wall of the tank in order to quickly sense abnormal pressure waves and disconnect the equipment from the railway line to prevent dangerous inspections.

Figures 1 and 2 show its conventional structure. As shown in the front view of Figure 1, the main body tank 1 has a soundproofing material 2 pasted on its inner surface to enhance the soundproofing effect. Covered by tank 3.

A conservator 4 is provided on the upper surface of the tank 3 in communication with the main tank 1 in order to cope with expansion and contraction of the insulating oil due to temperature changes.

In addition, a radiator 5 is installed on the front (and back) of the soundproof tank 3.
are arranged and communicated via valves 8 from both sides with an upper common main pipe 6 and a lower common main pipe 7, which are piped from the main body tank 1 through the soundproof tank 3.

An impact hydraulic relay 11 is provided on the outside of the side surface of the soundproof tank 3 via a joint 9 and a valve 10 that communicate with the main tank 1 .

That is, as its detailed structure is shown in FIG. It is connected to the tank 3 and covers the opening.

Further, the other flange of the joint 9 is connected to an impact hydraulic relay 11 via a valve 10.

In this way, in the past, the relay 11 was provided by penetrating the soundproof tank 3 and protruding to the outside in consideration of the wiring of the impact hydraulic relay 11 and its maintenance and inspection, so an opening was created in the soundproof tank 3. It became impossible to attach sound absorbing material to that part, and a good noise reduction effect could not be obtained.

In addition, in order to properly seal the A part between the main body tank 1 and the joint 9, the tightening of the 8-dimensional gasket 13 must be precisely adjusted, and the structure and adjustment of the joint 9 are complicated. there were.

Furthermore, since the impact hydraulic relay 11 is made to protrude outside the soundproof tank 3, there are drawbacks such as an increase in the external dimensions of the device.

This invention reduces the penetration part of the soundproof tank by equipping the common oil pipe for the radiator with an impact hydraulic relay, improving the soundproofing effect, and simplifying the installation structure without increasing the external dimensions. The purpose is to provide low-noise oil-filled electrical equipment.

Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings.

Fig. 3 is a side view of an oil-filled electrical equipment with a conservator showing an embodiment of the present invention, Fig. 4 is a partial front view as seen from arrow C, and Fig. 5
The figure shows a side view of FIG. 4, and the same reference numerals indicate the same parts throughout each figure, and the same reference numerals as in FIGS. 1 and 2 indicate the same or equivalent parts.

The configuration shown in the figure is different from the conventional configuration shown in FIGS. 1 and 2 above, in that a pocket 14 is provided on the upper surface of one of the lower common main tubes 7, and a valve 10 is provided on the front surface of the pocket 14 via a flange seat 15. and that an impact hydraulic relay 11 is attached.

At this time, the pocket 14 is formed in a portion of the lower common main pipe 7 located outside the soundproof tank 3, but it is provided closer to the soundproof tank 3 side so as not to protrude outside the radiator 5. It will be done.

By configuring oil-filled electrical equipment with a conservator in this way, abnormal pressure waves caused by a large amount of gas generated when the insulating oil is decomposed by electric arc etc. It is sensed by relay 11.

In this case, the common main pipe 7 for attaching the radiator is generally projected from the side of the main tank 1 through the soundproof tank 3 at a right angle, and has a certain cross-sectional area for the purpose of serving as a common oil pipe. Therefore, the abnormal pressure waves can be detected well.

Since the impact hydraulic relay 11 communicates with the main body tank 1 and is installed in a part of the lower common main pipe 7 located outside the soundproof tank 3, the soundproof tank 3 is separately penetrated in order to be installed outside the soundproof tank 3. There is no need to provide a section.

Therefore, in the soundproof tank 3, there are fewer parts where the sound absorbing material cannot be attached, so not only the soundproofing effect is improved, but also the number of parts that penetrate the soundproof tank with a complicated structure is reduced, so the number of manufacturing steps can be reduced.

Furthermore, since the impact hydraulic relay 11 is installed in the lower common main pipe 7 located at a low height, the wiring work, maintenance, and inspection work of the impact hydraulic relay 11 can be easily performed. Since it can be set up in one place,
It is possible to reduce transportation dimensions and installation area.

Incidentally, the impact hydraulic relay 11 is constructed by attaching a flange seat 15 to the end of the lower common main pipe 7 and installing it via the valve 10, as shown in FIG. 6, without providing the pocket 14 in the lower common main pipe 7. It's okay.

Further, in the above embodiment, an example in which the present invention is applied to oil-filled electrical equipment with a conservator has been described, but it goes without saying that the invention can be widely applied to general sealed oil-filled electrical equipment.

As described above, according to the present invention, it is possible to reduce the number of penetration parts, that is, openings, in the soundproof tank, so that it is possible to sufficiently attach the sound absorbing material to the inner surface of the soundproof tank. Since the structure and adjustment points are reduced, the number of manufacturing steps can be reduced, and a soundproof tank with a highly soundproof structure and a simplified shape can be obtained.

Further, it is possible to obtain a low-noise oil-filled electrical device that exhibits excellent effects, such as easy installation and maintenance and inspection of the impact hydraulic relay, and no increase in the outside diameter of the device.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional low-noise oil-filled electrical equipment with a conservator, Fig. 2 is a detailed view of the equipped part of the impact hydraulic relay, and Fig. 3 is an embodiment of the present invention with a conservator. 4 is a side view of a low-noise oil-filled electric device, FIG. 4 is a view taken in the direction of the arrow in FIG. 3, FIG. 5 is a detailed view of the equipped part of the impact hydraulic relay, and FIG. FIG. 3 is a detailed view of the equipped part of the impact hydraulic relay shown in FIG. 1... Body tank, 2... Sound absorbing material, 3
... Soundproof tank, 5 ... Heat sink, 6.
... Upper common main pipe, 7 ... Lower common main pipe, 8, 10 ... Valve, 9 ... Joint, 11
...impact hydraulic relay, 14...pocket, 15...flange seat.

Claims (1)

[Scope of utility model registration request] An impact hydraulic relay for detecting an internal accident in the main tank in a low-noise oil-filled electrical equipment in which a plurality of radiators are connected to upper and lower common main pipes protruding from the main tank through a soundproof tank. A low-noise oil-filled electrical device characterized by being attached to a lower common main pipe located outside the soundproof tank.