JPH069444Y2 - Gas insulated neutral point grounding resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a gas insulated neutral point grounding resistor.

[Conventional technology]

FIG. 3 and FIG. 4 are horizontal and vertical cross-sectional views showing the arrangement of a conventional resistor of this kind inside a container. Support insulators 2 are provided at four corners of a square resistor 1 and are grounded at a predetermined pressure. It is housed in a hermetically sealed container 3 filled with insulating gas. 4
Is a base insulator and 5 is a base for installation.

Here, the resistor 1 is composed of a lattice type resistor formed in a square shape, is stacked and held between the upper frame 6 and the lower frame 7, and is provided with a high-voltage side shield 8 on the upper part to protect the inner wall of the high voltage part from the inner wall. The voltage is being relaxed.

[Problems to be solved by the invention]

In this case, the planar arrangement of the resistor 1 is as shown in FIG.
That is, when the support insulators 2 are arranged at the four corners of the resistor 1, the larger the diameter of the support insulators 2 is, the more wasted space is, the larger the overall size is and the larger the container is.
Naturally, the amount of insulating gas to be filled also increases.

[Means for solving problems]

According to the present invention, in order to solve the above-mentioned drawbacks, when the diameter of the supporting insulator is more than 0.24 times the length of one side of the resistor, the supporting insulator is arranged in front of and behind the resistor, that is, in the square of the resistor. It is provided at the center position of each side to reduce the overall size. However, in the following description, when the support insulator 2 together with the upper frame 6 is covered with the shield 8 on the upper outer side as shown in the above both figures, the support insulator 2
The diameter B of the shield includes the shield 8 as shown.

〔Example〕

FIG. 1 shows an embodiment of a plane arrangement according to the present invention, in which a support insulator 2 is arranged at the center position of each side of a resistor 1. In addition, in order to compare with this, the resistor 1 and the supporting insulator 2 having the same dimensions as those in the above-described embodiment are used, and the supporting insulator 2 is used as the resistor
FIG. 5 shows a conventional plane arrangement provided at the four corners of.

Here, the length of one side of the resistor 1 is □ A, the diameter of the support insulator 2 is B, and the size required for the periphery to store the resistor 1 and the support insulator 2 in the container 3 is C. The dimension of one side of the container inner wall in the figure is □ D ₁ , and the same dimension in Fig. 5 is □.
Let it be D ₂ .

In both of the above figures, the dimensions □ D ₁ and □ D ₂ are given by the following equations.

Here, when the condition of D ₁ <D ₂ is obtained, Therefore, the diameter B of the support insulator is 0.
When the diameter exceeds 24 times, the container 3 can be reduced in size by adopting the arrangement of the present invention.

As can be inferred from FIG. 1, when the diameter B of the support insulator 2 is gradually increased, the support insulator 2 approaches the inner wall of the container 3 from the four corners of the resistor 1.

In this case, the required dimension C has to be taken from the supporting insulator 2, so that it becomes as shown in FIG. 2, and the dimension □ D ₁ of the container 3 is given by the following equation.

Therefore, as compared with the conventional arrangement shown in FIG. 6i, the dimension □ D ₂ of the container 3 according to the conventional arrangement is similar to the above. Given by Therefore, the relation of D ₂ > D _{1 is} always established.

By having the above relationship, for example, the resistor 1
Is □ 700 mm, and the diameter of the support insulator 2 is φ280 mm, the inner wall dimension of the container 3 is □ 1300 mm in the conventional arrangement, and in the embodiment, this inner wall dimension is □ 1100 mm. That is, the size of the container is reduced to 85% of the conventional example,
The area ratio is reduced to 72%, the size of the container is reduced, the insulating gas is reduced, and the installation area is reduced.

[Effect of device]

Thus, by placing the support insulators, which were conventionally arranged at the four corners of the resistor, at the center of each square side of the resistor, the sealed container for accommodating the insulator can be miniaturized and the insulating gas filled inside the container can be made smaller. Can be reduced.

[Brief description of drawings]

1 and 2 are cross-sectional views showing the planar arrangement inside the container according to the present invention, FIGS. 3 and 5 are cross-sectional views showing the conventional planar arrangement, and FIG. 4 is also the conventional internal structure. FIG. 1 ... Resistor, 2 ... Support insulator, 3 ... Container.

Claims (1)

[Scope of utility model registration request] 1. A resistor, which is housed in a hermetically sealed container filled with an insulating gas of a predetermined pressure and is formed by stacking square-shaped lattice resistors, and the resistor provided around the resistor to hold the resistor. And a supporting insulator having a diameter exceeding 0.24 times the length of one side of the square, wherein the supporting insulator is provided at the center of each side of the square. Ground resistor.