JPS6248887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in three-phase capacitors.

In a conventional three-phase capacitor, as shown in FIG. 1, a capacitor unit 3 is housed in an outer box consisting of a metal container 2, a metal top cover 6, and a metal bottom cover 7.
The impregnating agent 4 was injected and filled through the injection hole 5 provided in the metal upper lid 6. 8 is a mounting bracket. Therefore, the outer box of the three-phase Y-connected or △-connected drawer lead 9 is made of metal, so in order to maintain sufficient dielectric strength, the porcelain bushing 1 is required.
It is necessary to provide insulation between the capacitor unit 3 and the metal container 3 by placing an insulating material suitable for the insulation class between the capacitor unit 3 and the metal container 3, and to ground the metal container 2. capacitors were becoming more expensive.

The present invention aims to eliminate the above-mentioned defects and to provide a three-phase capacitor that has high insulation properties and can achieve protection coordination at low cost.

Hereinafter, the present invention will be described with reference to embodiments shown in FIGS. 2 to 10.

Figure 2 shows a Y-connected three-phase capacitor,
Multiple single-phase capacitors 23 housed in a metal container
is stored in a synthetic resin container 22, and the capacitor 23 is
A single-phase capacitor 2
3 are Y-connected and hermetically sealed with a synthetic resin upper cover 24. A resin bushing 2 is attached to the synthetic resin upper lid 24.
1 are attached, and an external separator 25 is provided between the bushings 21. Both the external separator 25 and the internal separator 26 may be capable of maintaining interphase insulation, and the resin bushing 21 does not need to have the required insulation level between the terminal and the container like the porcelain bushing 1 described above. Instead, it is sufficient to coordinate the insulation between the resin bushing 21 and the synthetic resin container 22.

Therefore, it is simple and easy to manufacture, is small and lightweight, and does not require a grounding wire, making installation work simple and extremely advantageous in terms of safety.

Note that it goes without saying that the lead-out terminals 27 drawn out from the single-phase capacitor 23 described above can also be made compact by simply providing insulation between the terminals, thereby achieving insulation coordination.

In FIG. 3, a hole is provided on the synthetic resin top cover 34 instead of the resin bushing 21 attached to the synthetic resin top cover 24 in FIG. 2, and an insulating bushing 35 made of rubber or the like is inserted into the hole. A high voltage insulated wire 31 is passed through the capacitor 35 and connected to a lead terminal 37 of a single-phase capacitor 33 housed in a metal container. 32 is a synthetic resin container with a bottom lid, which has the same effect as described above.

Figure 4 shows a single-phase capacitor 4 housed in a metal container.
3 upside down and high voltage insulated wire 41 as shown in Figure 3.
While pulling out the terminal part, open the synthetic resin top cover 44.
As shown in Fig. 5, a concave part 52 and a convex part 54 are formed in the fitting part so that the capacitor and the synthetic resin container 42 can be attached and detached as shown in FIG. Even so, only that capacitor can be used alternately, making it more economical. 45 is an insulating bushing, 46 is an internal separator,
47 is a lead terminal of a single-phase capacitor.

Figure 6 shows a synthetic resin container 62 and a synthetic resin top lid 64.
These are sealed by tightening them with screws through a packing 69, and can be applied not only to synthetic resin containers but also to porcelain containers.

In addition, the insulation distance can be increased by providing protrusions 28, 38, 48 on the bottom of the insulating container made of synthetic resin, etc. and external separator 25
can also be molded integrally with the insulating container or top lid.

Figures 7 and 8 show single-phase capacitors 73 and 8.
This figure shows a case in which current limiting fuses 79 and 89 are attached to the terminal lead-out portions of No. 3. Since the current limiting fuses can be built into an insulating container made of synthetic resin or the like, handling such as transportation and installation becomes convenient. 77 and 87 are one outgoing terminal, 78 and 88 are the other outgoing terminals grounded to the metal container, and 76 is a terminal for indicating the current limiting fuse 79;
C indicates the capacitance of a single-phase capacitor.

Figures 9 and 10 show examples of wiring three-phase capacitors, and Figure 9 shows the ratings for a double Y-wired system using six single-phase capacitors housed in a metal container.
In case of 6.6KV class, single phase capacitor 93a, 93
b are arranged alternately, a separator plate 96 is provided between each single-phase capacitor, and the capacitor is housed in an insulating container, and a voltage difference or current difference is established between each neutral point N ₁ and N ₂ of the double Y connection. It is integrally constructed with a moving protection device 90 attached thereto. Figure 10 shows a case of a rated 3.3KV class in which three single-phase capacitors housed in a metal container are double Y-wired, and an insulating separator 106 is provided between the single-phase capacitors 103 and the capacitors are housed in an insulating container. and the neutral point of each double wye connection.
A protection device 100 similar to that described above is attached between N ₁ and N ₂ to form an integral structure.

In Figures 9 and 10, in addition to being equipped with a protective device, it is also possible to mechanically protect adjacent single-phase capacitors using separators 96 and 106. etc., and no secondary damage occurs.

As mentioned above, the three-phase capacitor of the present invention is small,
It is lightweight, extremely safe, and extremely advantageous in terms of productivity, and has great industrial and practical value.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional three-phase capacitor, Figure 2
Figures to Figures 4 are examples of the three-phase capacitor of the present invention, and Figure 2A is a plan view, Figure 3B is a front sectional view, Figure 3A is a cross-sectional view of the main part, Figure 4 is a front sectional view, and Figure 4A is a front sectional view. A is a front sectional view, B is a cross-sectional view of the main part seen from below, FIGS. FIG. 8 is a front view of the main terminal parts of a single-phase capacitor according to the present invention, and FIGS. 9 and 10 are wiring diagrams of a three-phase capacitor according to the present invention. 21...Resin bushing, 22, 32, 42
...Synthetic resin container, 23, 33, 43, 73, 8
3,93a,93b,103...single phase capacitor, 24,34,44...synthetic resin top cover, 27,
37, 47, 77, 78, 87, 88...Single phase capacitor terminal, 31,41...Cable wire,
79, 89...Current limiting fuse, 90,100...
Protective device.

Claims (1)

[Scope of Claims] 1. A plurality of single-phase capacitors housed in a metal container are housed in an insulating container made of synthetic resin, etc., the single-phase capacitors are Y-connected or Δ-connected, and a bushing or A three-phase capacitor whose terminals are drawn out through a cable wire. 2. The three-phase capacitor according to claim 1, wherein a separator is provided between the single-phase capacitors. 3. The three-phase capacitor according to claims 1 and 2, wherein a current-limiting fuse is attached to the terminal lead-out portion of the single-phase capacitor housed in the metal container. 4. Claims 1 and 2, wherein the single-phase capacitor is connected to a double Y connection and a protection device for voltage differential or current differential can be attached between the respective neutral points. three-phase capacitor.