JPS6025018B2 - 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 and housed in one tank.
In particular, the present invention relates to a device that rationalizes the insulation of this type of device and achieves a reduction in size when the capacitor of this type of device has an even number of series-connected stages.

As shown in Fig. 1, a case-type capacitor consists of a so-called capacitor element 1 made by alternately overlapping single or composite compacts of plastic film and insulating paper with electromagnetic foil and wrapping them in a cloth shape. Several dozen terminals were housed in a flexible thin metal case 2, impregnated with insulating oil 3 and sealed, and one of the hookings 4 was pulled out, and the case 2 itself was used as another terminal 5. It is of composition. As an example, the two case-type capacitors designated by general symbols 6a and 6b constructed in this way are put together as shown in FIG. 2 to form a grounded capacitor device 10.
The following describes the case of forming. That is, 11 is a tank that has a cover 14 with a ground bushing seat 12 and a ground bushing 13 at the upper opening, and is airtight, and is equipped with a high pressure bushing pocket 15 and a high pressure bushing 16 on the side. An insulating support such as an insulator 1
A capacitor rack 18 is housed and arranged via 7a and 17b. On this capacitor rack 18, case-shaped capacitors 6a and 6b are stacked horizontally as shown in the figure in multiple stages. The high-voltage bushing 16 and the bushing 4 of the case-type capacitor 6a are connected with an insulated conductor 19, and the terminal 5 of the case-type capacitor 6a is connected to the terminal 5 of the case-type capacitor 6b via the capacitor rack 18. The bushing 4 and the ground bushing 13 are connected in series with an insulated conductor 20. Note that 21 is insulating oil, 22
is a gas chamber, and 23 and 24 are fixed supports for fixing stored items such as a condenser rack. By the way, in the grounded capacitor device configured as described above, when the circuit voltage E No. 3 is applied between the high-voltage bootsing 16 and the grounded bushing 13, the voltage applied between the case-shaped capacitors and between the case-shaped capacitor tank is the third voltage. The result will be as shown in the figure.

That is, if the capacitances of the case-type capacitors are the same, the circuit voltage E/3 is divided and applied to each case-type capacitor by E/2-3. However, a voltage of E/2 is applied to the insulating supports 17a and 17b of the capacitor rack 18, respectively. Therefore, even when the outside air temperature becomes low, the temperature of the insulating oil 21 decreases, and the oil level decreases, the insulating support 17
In order for B to sufficiently withstand the flash voltage in oil, it was necessary to fill extra insulating oil 21 in advance to take into account the volume shrinkage at low temperatures, and the gas chamber 22 also had to be enlarged accordingly. . Furthermore, although not shown, if insulating barriers are arranged according to the electric field distribution for the purpose of shortening the flashover distance, there are disadvantages such as having to provide more insulation at the top of the tank, which is the highest oil temperature area. have. The present invention has been made to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a compact, lightweight, and economical grounded capacitor device by rationalizing the insulation of this type of device.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

FIG. 4 shows a grounded capacitor device 10a in which case capacitors 6a and 6b are collectively housed, and 11a
has a cover 14a equipped with a grounding bushing seat 12 and a grounding bushing 13 in the upper closed part, and is airtightly constructed, and has a high-pressure bushing pocket 15a and a high-pressure bushing 1 in the side part.
It is a tank equipped with 6. Capacitor racks 18a and 18b are housed in this tank 11a via insulating supports 17a, 70 and 17c such as insulators. Then, lay down the case type capacitor 6a on the capacitor rack 18a.
Then, place the case type capacitor 6b on the capacitor rack 18b again with the bushing 4 facing downward. And high voltage bushing 16 and case type capacitor 6a
The bushing 4 of the case type capacitor 6a is connected to the insulated conductor 19a, and the terminal 5 of the case type capacitor 6a is connected to the pusher 4 of the case type capacitor 6a via the capacitor rack 18a.
Connect with b. Terminal 5 of case type capacitor 6b is connected to grounding bushing 13 via capacitor rack 18b by insulated conductor 20a. Note that 21a is insulating oil, 22a is a gas chamber, and 23 and 24a are fixed supports for fixing stored items such as a condenser rack. In the grounded capacitor device 10a of the present invention configured as described above, when the circuit voltage E/no3 is applied between the high voltage bushing 16 and the grounded bushing 13, the voltage applied between the case capacitors and between the case capacitor tank is The result is as shown in FIG.

That is, if the case capacitors have the same capacity, the circuit voltage E/3 is divided and applied to each case capacitor E/2.
3 will be added at a time. However, the insulating support 17a that insulates and supports the capacitor rack 18a has E-2-3, and the insulating support 17b that is disposed on the capacitor rack 18a and supports the capacitor rack 18b insulatingly has E/2-3. voltage is applied to each. Insulating support 1 disposed on the insulation rack 18b and insulatingly supporting the upper fixed support 24a
7c has an insulation strength that can withstand 10 kVl during an AC withstanding voltage test on the ground side, but it is normally grounded and no voltage is applied. Therefore, the top case type capacitor 6
The case 2 of b is at ground potential, the gas chamber 22a is arranged on the ground potential side, and the oil level at the lowest outside temperature is the terminal of the bushing 4 of the case type capacitor 6b, which is the conductive part of the uppermost stage. The distance may be set to the required distance for the voltage E/2 to 3 applied to the section. In other words, it is sufficient that the insulating portion of the bushing 4 is submerged in oil. According to the grounded capacitor device according to this embodiment, both the insulating oil filling part 21a and the gas chamber 22a can be made smaller by about 30%, and the volume ratio is reduced to about 67% compared to the conventional one. I was able to do it. 0 Also, although not shown, if an insulating barrier is installed according to the electric field distribution for the purpose of shortening the flashover distance, an insulating barrier should be installed since the upper part of the tank, which has the highest oil temperature, becomes the grounding part. It has the advantage that it is not necessary and can improve the heat dissipation effect.

As described in detail above, according to the present invention, it is possible to provide a small, lightweight, and economical grounded capacitor device.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part of a case type capacitor, Figure 2 is a sectional view showing a conventional grounded capacitor device, Figure 3 is an equivalent connection diagram of Figure 2, and Figure 4 is an embodiment of the present invention. FIG. 5 is an equivalent connection diagram of FIG. 4. 6a, 6b... Case type capacitor, 11a.
...Tank, 21a...Insulating oil, 4...
...Case type capacitor bushing, 10a...
...Grounded capacitor device, 22a...Gas chamber. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. In a grounded capacitor device in which a plurality of case-type capacitors are assembled and stacked in multiple stages and stored in one tank and filled with insulating oil, the topmost case-type capacitor is A grounded capacitor device characterized by a bushing provided at the bottom. 2. The grounded capacitor device according to claim 1, wherein the number of series-connected case capacitors is an even number. 3. The grounded capacitor device according to claim 2, wherein the upper part of the tank is a gas chamber, and a grounded portion is provided on the side of the gas chamber.