JPS633139Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an oil-immersed capacitor, and particularly relates to a mounting structure for an oil duct for connecting to other equipment.

[Technical background of the invention]

Generally, this type of oil-filled capacitor is used by connecting it to other equipment such as a series reactor or switch, or by connecting multiple capacitors in series or in parallel. In addition, oil ducts are used to connect oil-filled capacitors because of the recent growth in demand for electricity and advances in power transmission technology that have increased the capacity of each unit.

The perspective view in Fig. 1 and the sectional view in Fig. 2 show conventional examples of such oil-filled capacitors.
1 is the capacitor tank side plate, 2 is the cover, and 3 is the capacitor contents assembly. A through bushing 4 is mounted on this cover 2, and a duct seat 5 is further mounted so as to surround this through bushing 4.

The oil duct 6 is attached to the duct seat 5.
It is attached so that it protrudes from the left and right side walls. Further, a connecting conductor 7 is arranged on the center line of the oil duct 6 projecting left and right, and is connected to bushings 8 provided at both ends of the oil duct 6.

9 is a cover for the duct seat, and the first
As shown in the figure, an oil volume adjustment chamber 10 is installed to absorb volume changes due to temperature changes of insulating oil (not shown) filled in the capacitor body and the oil duct.

Fig. 3 shows the connection state of the oil-filled capacitor 11 constructed in this way. Therefore, a capacitor bank is constructed by connecting them in series or in parallel using metal bellows 12. Furthermore, the oil-filled condenser 11 is connected to the oil duct 6.
from the series reactor 1 via the metal bellows 12
3 and the duct of the switchgear 14 to constitute necessary electrical equipment.

By the way, at this time, each device 1 to be connected to each other
1, 13, and 14, in order to ensure the insulation distance between the conductor connecting the devices and the metal bellows 12, it is necessary to connect the ducts so that the center lines of the ducts are aligned, as is clear from the figure. In addition, in the oil-filled capacitor 11, the oil ducts 6 provided on both side walls of the duct seat 5 are attached to the duct seat 5 with their center lines aligned with each other in order to ensure an insulation distance between the connecting conductor 7 and the oil duct 6. This is necessary.

[Problems with background technology]

However, in the conventional oil-filled capacitor 11 described above, the oil duct 6 must be attached to both side walls of the duct seat 5 separately from each other, making it difficult to align their center lines. Moreover, the installation position of the oil duct 6 must be determined according to the duct position with the series reactor 13 and the switchgear 14.Furthermore, as capacitors have become larger and have larger capacities recently, the oil duct 6 has to be installed more and more. It becomes difficult to manage the dimensions of the duct 6, and there is a risk that insulation reliability will be impaired.

Further, in the oil-filled capacitor 11, since the through bushing 4 is provided and the duct seat 5 is provided surrounding it, the volume becomes large, which requires a large amount of insulating oil. Conversely, problems arose, such as the difficulty of increasing the capacitance of the capacitor.

[Purpose of invention]

The present invention solves the above problems, facilitates duct size management with a simple structure, and provides an economical, efficient, and reliable oil-immersed capacitor that allows the capacitor body to be filled to the limit of the transportation height limit. The purpose is to provide

[Summary of the idea]

For this reason, the present invention does not provide a duct seat to separate the ducts, but rather uses the upper half of the continuous duct as a tank cover, cuts out the lower half of the duct, attaches it to the tank, and protrudes from both sides of the tank. It is characterized by the following.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view of an oil-filled capacitor according to an embodiment of the present invention, FIG. 5 is a perspective view of its duct portion,
Figure 6 is a perspective view of the tank side plate portion, and Figure 7 is a cross-sectional view of the capacitor that combines these parts. Throughout each figure, the same reference numerals as in Figures 1 and 2 indicate the same or equivalent parts. , 15 is a hand hole.

As is clear from FIG. 4, the oil-filled capacitor of this embodiment is constructed by attaching an oil duct 6 directly to the side plate 1 of the condenser tank. Both ends are cylindrical, and the central part is a single duct with a portion cut out. On the other hand, the upper end of the capacitor tank side plate 1 is previously cut out into a duct shape to match the outer diameter or inner diameter of the oil duct 6, as shown in FIG. By combining these as shown in FIG. 7, one duct is made to protrude from both sides of the capacitor tank side plate 1. At this time, the cover 2 provided on the upper surface of the capacitor tank side plate 1 utilizes the upper half of the oil duct 6 as a part of the cover.

In this way, the oil duct 6 of the oil-filled condenser
By adopting a structure in which the oil duct 6 is attached without being separated as in the past, the oil duct 6 can be installed at the same time as the capacitor tank side plate 1 is manufactured, making it possible to manufacture the conventional condenser tank side plate 1 and cover 2 as one piece Furthermore, compared to a method in which a separately manufactured oil duct 6 is mounted on top of the oil duct 6, the number of work steps is reduced and work efficiency is improved. Moreover, in the case of this embodiment, the oil duct 6 is composed of one piece and is not divided, so that the installation work of the ducts protruding to the left and right sides of the tank can be done at the same time, which is the biggest problem in the duct configuration. Management of dimensional accuracy, parallelism, and horizontality, which are points, can be solved simultaneously and easily, and the oil duct 6 can be easily and accurately installed. As a result, the distance between the connecting conductor 7 and the inner wall of the oil duct 6 becomes constant, and the electric field is stabilized without disturbance, thereby improving insulation reliability.

Furthermore, the shape of the cover 2 is not a flat plate as in the conventional case, but is convex due to the oil duct 6, thereby increasing rigidity. This means that the conventional cover reinforcing piece is not required, and in this respect as well, the number of parts and work can be reduced.

Furthermore, not mounting the duct seat 5 on the tank cover as in the past means that the main body of the capacitor can be enlarged to the position of the conventional duct, and the capacitor capacity can be increased accordingly compared to the conventional one. . In other words, the oil-filled capacitor is
Since the stress (potential gradient) between the electrodes is about 8 to 10 times higher than that of other electrical devices such as transformers, it is necessary to perform complete oil-tight treatment under high vacuum. This is not done in a factory with well-managed equipment; therefore, it is necessary to transport the finished product from the factory to the site, but there are restrictions on size and weight under the Road Traffic Act. Therefore, the structure of this embodiment, which allows the main body of the capacitor to be enlarged to the duct position except for the duct seat 5, can be said to be the optimal structure for obtaining an efficient oil-filled capacitor within the above-mentioned transportation restrictions.

In the above embodiment, the oil duct 6 is cylindrical in shape; however, the present invention is not limited to this, and may take any other shape, such as a rectangular cylinder.

Furthermore, the position where the oil duct 6 is installed is not limited to the upper part of the tank, but can also be installed at the corner of the tank, for example, as shown in FIG.

Furthermore, if a non-magnetic steel material such as stainless steel is used as the material for the oil duct 6, the cover and tank parts are separated by the non-magnetic steel duct, thereby preventing the generation of eddy currents in the capacitor tank side plate 1 and cover 2. Benefits can be obtained.

[Effect of idea]

As described above, according to the present invention, the duct can be attached to the tank easily and with high dimensional accuracy.
An extremely efficient oil-immersed capacitor with improved insulation reliability, reduced manufacturing and assembly man-hours, and improved workability, economy, and reliability due to increased rigidity of the tank cover can be obtained.

[Brief explanation of drawings]

Figure 1 is an external perspective view of a conventional oil-filled capacitor.
Fig. 2 is a sectional view of the oil-filled capacitor, Fig. 3 is an explanatory diagram of the connection state of the oil-filled capacitor, Fig. 4 is an external perspective view of the oil-filled capacitor showing an embodiment of the present invention, and Fig. 5 is FIG. 6 is a perspective view of the tank side plate portion of the oil-filled capacitor, FIG. 7 is a sectional view of the oil-filled capacitor, and FIG. 8 is another embodiment of the present invention. It is a side view of an oil-filled capacitor showing. 1...Capacitor tank side plate, 2...Cover,
3...Capacitor contents assembly, 4...Through bushing, 5...Duct seat, 6...Oil duct, 7...
... Connection conductor, 8 ... Bushing, 9 ... Duct seat cover, 10 ... Oil amount adjustment chamber, 11 ... Oil-filled capacitor, 12 ... Metal bellows, 13 ... Series reactor, 14 ... Switching device.

Claims (1)

[Scope of utility model registration request] In an oil-filled capacitor that has a duct that wraps the lead-out conductor protruding from both sides of a tank that stores the contents of the capacitor together with insulating oil, the upper part of the center part is also used as a tank cover, and the lower part of the duct is cut out with this cut shape. An oil-filled capacitor characterized by being attached to the upper part of a tank side plate cut out to match the size of the tank, and protruding from both sides of the tank side plate.