JPH04376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a capacitor device of a type that has a shield case that covers the entire capacitor body, and the entire shield case is insulated from a storage tank.

[Prior art]

Figure 1 shows the internal structure of a ground capacitor for a 33KV circuit or less.

In the figure, 1 is a bushing, 2 is a tank, 4 is a capacitor body gathering plate, 5 is a capacitor body (dielectric), and 6 is an insulating part. Shield cases are generally not used in this insulation class.

Figure 2 shows the internal structure of a ground capacitor for a 66KV circuit or higher.

In the figure, the same parts as in FIG. 1 are designated by the same reference numerals, but unlike the one shown in FIG. Shield case 3 that covers the whole
The capacitor body 5 is divided into two parts, connected to the shield case 3 at the dividing point to fix the same potential, and further formed with an insulating part 6 and housed in the tank 2.

In this insulation class, it is reasonable to use a shield case because it serves both as insulation and to fix the element body, and as explained above, the shield case is adopted.

In the configuration shown in Figure 1, there is a limit to the insulation class that can be adopted due to the insulation design, and even in the configuration shown in Figure 2, if the insulation class is higher, the insulation between the element body and the shield case (collecting plate) The insulation distance (thickness) of the parts increases, and the insulation configuration and mounting structure (including the collecting plate) become complicated, which is disadvantageous for assembly workability and compactness.

[Disclosure of the invention]

As explained above, the higher the insulation class for a structure equipped with a shield case, the more complex the insulation structure and mounting structure become. is divided into two equal parts, and the intermediate points of each are used as lead-in/out-out terminals, and the shield case is configured to have the same potential as both ends of each of the capacitor elements divided into two parts, and the insulation between the element body and the shield case is maintained. This simplifies the process, thereby improving the assembly workability of the capacitor device and making it possible to make it more compact.

The embodiment shown in FIG. 3 will be described below.

In the figure, 1 is the bushing, 2 is the tank, 3 is the shield case, 4 is the element assembly plate, 5 is the element body, and 6
7 is an insulating part between the tank and the shield, and 7 is an insulating part between the shield and the element body.

Further, FIG. 4 is an electrical explanatory diagram of the embodiment shown in FIG. The element constituting the element body 5 is divided into four parts, both ends A and B and the center part C are set to the potential of the shield case 3, and the center points D and E of each element body between the potentials of the shield case 3 are input and output. (Pull-in/Draw-out) Department. The shield case may have a plate shape, a mesh shape, a round pipe lattice shape, or other configurations.

In the above example, if the terminal voltage is E, each voltage e _{1 and} e ₂ in the divided element body becomes e ₁ = e ₂ = E/2, but e ₁ ≠ e ₂ and e ₁ + e ₂ =E.
Of course, it is necessary to provide step-level insulation in the direction of assembly of the element bodies, but the shielding case insulation at both ends and the center of the element body is greatly simplified, and the structure of the element fixing part is simplified. The overall insulation configuration between the element body and the shield case is rationalized, and as a result, the capacitor device can be made more compact without deteriorating the insulation performance.

Note that in the above example, all three points A, B, and C are electrically connected to the shield case 3, but point C does not need to be connected, and in the above example, the crossing between A and B is Although the shield case 3 is used, depending on the current value, a lead wire may be used to connect A and B separately. Of course, in this case, the potential of either A or B may be fixed to the shield case 3.

FIG. 4 shows another embodiment.

In this embodiment, unlike the embodiment shown in FIG. 2, there is no bushing on one side, and one input/output section is fixed at the potential of the tank 2.

[Brief explanation of drawings]

Figure 1 shows an example of the internal structure of a ground capacitor that does not use a shield case. FIG. 2 shows an example of the internal structure of a conventional ground capacitor using a shield case. FIG. 3 shows an embodiment of the invention. FIG. 4 is an electrical explanatory diagram of the embodiment of FIG. 3. FIG. 5 shows another embodiment of the invention. 1... Bushing, 2... Tank, 3... Shield case, 4... Element assembly board, 5... Element body (dielectric), 6
...Insulation between tank and shield, 7.Insulation between shield and element body.

Claims (1)

[Claims] 1. In a capacitor device having a shield case that covers the entire capacitor body, and in which the entire shield case is insulated from a storage tank, the element body is arbitrarily divided into two parts, and each of the two halves is divided into two equal parts, A capacitor device characterized in that the intermediate points of each of the two halves are used as lead-in and lead-out terminals, and both ends of each of the two halves are made to have the same potential as a shield case.