JPS6013289B2 - grounded capacitor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounded capacitor device in which a plurality of case-shaped capacitors are assembled together and stored together with insulating oil in one tank.

A conventional general grounded capacitor device will be described with reference to the drawings.

In Fig. 1, several to dozens of so-called capacitor elements 1 are fabricated by alternately overlapping solid fin bodies and electrode foils and winding them into a cloth shape. A case type capacitor 5 is constructed by storing the capacitor in a case 2, impregnating it with insulating oil and sealing it, and pulling out one of the pushers 3, and using the case 2 itself as another terminal 4.As an example, a case type capacitor 5 is constructed. A grounded capacitor device 30 is formed by combining a plurality of case-shaped capacitors 5, 5a, 5b, and 5c, as shown in FIG.

That is, it is configured airtight with a cover 7 at the upper entrance, and high pressure bushing pockets 8 and high pressure bushings 9 on the sides.
, a grounding bushing seat 10, and a grounding bushing 11, insulating supports 12a, 12b, 1, etc.
3, the capacitor racks 14 and 15 are stacked in the height direction and arranged for storage. Case-type capacitors 5a and 5b and case-type capacitor 5c are stacked on these capacitor racks 14 and 15, respectively, as shown.
Also, the high voltage bushing 9 and the terminal 4 of the case type capacitor 5c arranged above are connected by an insulated conductor 16, and the bushing 3 of the case type capacitor 5c and the case type capacitor 5b are connected.
The pushing 3 of the case type capacitor 5b is connected to the terminal 4 of the case type capacitor 5a via the capacitor rack 14. The pushing 3 of the case type capacitor 6a and the grounding bushing 11' are connected by an insulated conductor 18. Note that 19 is insulating oil,
20 is a gas chamber, and 21 and 22 are fixed supports for fixing stored items such as a condenser rack. By the way, in the grounded capacitor device 301 configured as described above, when the circuit voltage E/3 is applied between the high voltage bushing 9 and the grounded bushing 11, the voltage between the case capacitors and between the case capacitor and the tank increases. The applied voltage is as shown in FIG.

That is, if the capacitances of the case-type capacitors are the same, the circuit voltage E/3 is divided and E/3-3 is added to each case-type capacitor. However, the insulating support 12a that insulates and supports the capacitor rack 14 has E/3 zo 3, and the insulating support 13 that is disposed on the capacitor rack 14 and insulates and supports the condenser rack 15 has bait 3 no 3 and a capacitor rack. A voltage of E/3 is applied to each of the insulating support members 2b disposed on the upper fixed support member 15 and insulatingly supporting the upper fixed support member 22. Therefore, the highest voltage application section is placed on the gas chamber 20 side. Insulating gas has a lower dielectric strength than insulating oil, so if the outside air temperature becomes low and the temperature of insulating oil 19 drops and the oil level decreases, if insulating support 12
In order for B to sufficiently withstand the flash voltage in oil, it is necessary to fill the insulating oil 19 with excess volume in advance to account for the volumetric shrinkage at low temperatures, and the gas chamber 20 also has to be enlarged accordingly. Ta. Furthermore, although not shown in the figure, if an insulating barrier is installed around the case-type capacitor according to the electric field distribution in order to shorten the flashover distance, "more insulation will be applied to the upper part of the tank, which is the hottest part, and heat dissipation will be reduced. This has disadvantages such as not only deterioration but also increase in weight.The object of the present invention is to eliminate the above-mentioned disadvantages and provide a compact, lightweight, and economical grounded surface capacitor device.

In order to achieve such an object, the present invention collects a plurality of case-type capacitors and stores them together with insulating oil in the same tank, and connects the plurality of case-type capacitors in series so that one of them is connected to the ground side. In a grounded capacitor having one end connected to the power supply side, a plurality of case capacitors are stacked one on top of the other with the grounding side facing upward and the power supply side facing downward.

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

FIG. 4 shows a grounded capacitor device 30a according to the present invention. In the figure, the tank 6a is airtightly constructed with a cover 7a equipped with a grounding bushing seat IQ and a grounding bushing 11 in the upper opening □, and has an insulator, etc. The capacitor racks 14 and 15 are stacked and housed in the height direction via insulating supports 22a, 22b and 23a. Among these, a case type capacitor 5 is placed on the capacitor rack 14.
a and 5b, and also place a case-shaped capacitor 5c on the capacitor rack 15. The high voltage pushing 9 and the bushing 3 of the case type capacitor 5a are connected through an insulated conductor 16a, and the terminal 4 of the case type capacitor 5a is connected to the terminal 4 of the case type capacitor 5b via a capacitor rack 14. The bushing 3 of the case type capacitor 5b and the bushing 3 of the case type capacitor 5c are insulated conductors 17a.
The terminal 4 of the case type capacitor 5c and the grounding bushing 11 are connected by an insulated conductor 18a. Note 19
20a is a gas chamber, and 31 and 32 are fixed supports for fixing stored items such as a condenser rack. However, in the grounded capacitor device 30a of the present invention configured as described above, when the circuit voltage E/3 is applied between the high voltage bushing 9 and the grounded bushing 11, the voltage between the case capacitors and between the case capacitor and the tank increases. The applied voltage is as shown in FIG.

That is, if the capacitances of the case-type capacitors are the same, the circuit voltage E/ is divided and E-3 is applied to each case-type capacitor. However, the insulating support 22a that insulates and supports the capacitor rack 14 has bait 3 in it, and the insulating support 23a that is placed on the capacitor rack 14 and insulates and supports the capacitor rack 15 has a cup/3 zo 3 in it. voltage is applied to each. However, since the capacitor rack 5 and the cover 7a are normally at the same potential, the insulating support 22b disposed on the capacitor rack 15 and insulatingly supporting the upper fixed support 32 is short-circuited and no voltage is applied to this portion. This insulating support 22b only needs to have an insulating strength that can withstand one plate VI minutes during an AC withstand voltage test on the ground side. Therefore, at the lowest outside temperature, the oil level in the tank 6a is at a position with the required insulating distance in oil for the voltage E/3 no 3 applied to the terminal part of the bushing 3 of the case-type capacitor 5c, which is the uppermost conductive part. Just set it. For example, rated voltage 14
．． 3 case-type capacitors with a side V and a capacitance of 0.3 French F.
In a grounded capacitor device with a circuit voltage of 77/3 KV and a capacitance of 0.3 French F, in which a group of capacitors connected in parallel are connected in series in three stages, the lowest oil level is set at the bushing 3 of the uppermost case capacitor 5c. It is possible to set it on the top of the mounting part. Therefore, both the insulating oil filling part and the gas chamber are 25%
It is now possible to reduce the volume by 1 compared to the conventional example.
00%, the size could be reduced to about 67%.
Furthermore, although not shown in the drawings, in the case where insulating barriers are arranged according to the electric field distribution for the purpose of shortening the flashover distance, according to the present invention,
The upper part of the tank, which is the highest oil temperature part, is the grounded part, and there is no need to provide an insulating barrier in this part, which has the advantage of increasing the heat dissipation effect.

FIG. 6 shows another embodiment of the present invention in which the number of series-connected stages is an even number.

Ground bushing seat 10, ground bushing 1 on the upper closing part
Insulating supports 42a, 42b, 43 such as insulators are installed in the tank 6b, which is airtight and has a cover 7a with a high-pressure bushing pocket 8 and a high-pressure pusher 9 on the side.
The capacitor racks 14a and 15a are housed through the capacitors 14a and 15a. Of these, the case-type capacitors 5a and 5b are placed on the capacitor rack 14a, and the case-type capacitors 5c and 5d are placed on the capacitor rack 15a as shown. In other words, the case type capacitor 5d is sent to the top stage.
are placed on the capacitor rack 15a so that the bushings 3 are arranged vertically. Even with this configuration, the bushing 3 of the case-type capacitor 5d can be placed in the gas chamber 20b, making it possible to lower the position of the curved surface, thus making it possible to reduce the amount of insulating oil and the gas chamber. . As described in detail above, according to the present invention, it is possible to provide a small, lightweight, and economical grounded surface capacitor device.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the rhombus part of a case-type capacitor, Figure 2 is a sectional view of a conventional grounded capacitor device, and Figure 3 is a sectional view of a case-type capacitor.
4 is a sectional view showing a grounded capacitor device according to an embodiment of the present invention, FIG. 5 is an equivalent connection diagram of FIG. 4, and FIG. 6 is an equivalent connection diagram according to another embodiment of the present invention. FIG. 2 is a cross-sectional view of a grounded capacitor device. 3... Bushing, 4... Terminal, 5a, 5b, 5c
...Case type capacitor, 6a...Tank, 7a...
...Cover, 9...High pressure bushing, 11.
...Grounding bushing, 22a, 22b, 23a.
・・・． ...Insulating support. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1 A plurality of case-type capacitors are collected together and stored together with insulating oil in the same tank, and the plurality of case-type capacitors are connected in series, one of which is connected to the ground side and the other to the power supply side. A grounded capacitor characterized in that the plurality of case-shaped capacitors are arranged in a stacked manner with their grounding sides facing upward and their power supply sides facing downward.