JPS6246041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightning arrester used in a high-voltage system, and particularly to a lightning arrester in which a plurality of series circuits formed by connecting a plurality of non-linear resistors in series are connected in parallel. It is.

Conventionally, this type of lightning arrester has been shown in FIGS. 1 and 2. That is, a plurality (m) of non-linear resistors 1 made of sintered metal oxides are stacked and electrically connected to form a series circuit, and two of these structures are placed side by side to form an electrical circuit. Configure parallel connection. This example shows the case of two series circuits, but this number can be changed to an appropriate number (n) depending on the purpose of use.
It can be made into pieces. The non-linear resistor 1 is housed in an insulated pipe 2, and with a predetermined contact pressure applied by a compression spring 3, two sets of the non-linear resistor 1 are stacked together by upper and lower metal connecting plates 4. , are assembled in parallel. In this case, stack,
The potentials of the non-linear resistors 1 in the corresponding stages are not the same, and the terminals on the line side and the ground side are always at the same potential by means of the metal connection plate 4.

In the conventional lightning arrester described above, when the voltage of the power transmission system in which it is used is at most 110 KV or less, the number m of non-linear resistors 1 connected in a stack in series can be 50 or less, so the above-mentioned configuration is sufficient. There is no problem. However, if the voltage of the power transmission system used is higher than the above, the height of one stack of nonlinear resistors 1 will exceed 2 meters, and it will be necessary to configure multiple such stacks in parallel. However,
If this were to be the conventional structure described above, the height would be extremely long. Therefore, there is a limit to the number of laminated layers from the viewpoint of mechanical strength.

Furthermore, when considering a lightning arrester for future UHV power transmission, there is a serious problem that the above-mentioned conventional direct or parallel arrangement structure cannot be constructed due to height and dimensions.

An object of the present invention is to solve the problems of the conventional device described above, eliminate the need for an elongated structure, and provide a lightning arrester with high mechanical strength.

A further object of the present invention is to provide a lightning arrester suitable for UHV power transmission systems.

In the following, the invention will be explained in detail with reference to the illustrated embodiments. In Fig. 3, nonlinear resistor 1
and metal connection plate 4 are both similar to the conventional ones described above. In this embodiment, the stack in which nonlinear resistors 1 are connected in series consists of four resistors A, B, C, and D.
It consists of individuals. The four stacks have the same structure, so to explain stack A, stack A consists of two divided stacks A1 and A2 placed side by side.
These two divided stacks A1 and A2
are electrically connected in series. That is, the non-linear resistors 1 of each divided stack A1, A2 are separated into groups of five with an insulator 5 interposed between them, and the divided stack A1 , A2 are electrically connected alternately. The insulator 7 insulates the upper end of the divided stack A2 and the metal connection plate 4, and
It is inserted in consideration of the connection arrangement by the connection conductor 6. As is clear from the drawing, stacks B and C
Stacks A and D also have the same configuration as stack A, respectively. In this example, the nonlinear resistance elements 1 are divided into groups of five, but it goes without saying that this number can be arbitrarily selected.

With the above-described configuration, one stack A of non-linear resistors 1 connected in series is mechanically divided into two divided stacks A1 and A2, which are arranged side by side, and divided into appropriate numbers by the insulator 5. Nonlinear resistor 1
Since the groups are connected in a zigzag manner using the connecting conductor 6, the entire non-linear resistor 1 of the stack A is electrically connected in series. Therefore, the height of the stack is significantly lower than that of the conventional one, and a stack configuration of the same number of nonlinear resistors can be realized with a low height.

Figure 4 shows the four stacks A,
An embodiment is shown in which stacks B, C, and D are arranged and arranged side by side on the circumference symmetrically with respect to the center of the circle, and a pillar 8 made of an insulator is erected at the center, and each stack A, B, C and D are held in place by an appropriate number of insulating rods 9 coupled to a metal connection plate (not shown) corresponding to the metal connection plate 4 described above.

Other embodiments shown in FIGS. 5 and 6 are constructed by dividing each of the four stacks A, B, C, and D into four. Stack A1, A
2, A3, and A4 are erected in a quadrant, and the nonlinear resistors are all connected in series through a connecting conductor 6. The other stacks B, C and D are of similar construction and are located within each quadrant. Also, pillars 8a, 8b, 8c and 8d similar to the central pillar 8
are arranged in each stack A, B, C and D, respectively, and each stack is held using an insulating rod 9. In this case, one stack A is made by forming the connecting conductor 6 in an appropriate shape and size, and sequentially and alternately connecting the nonlinear resistors 1 of the divided stacks A1 to A4 to form a nonlinear resistor, as shown in FIG. The entire resistor 1 is connected in series.

As described above, according to the present invention, a plurality of stacks are arranged side-by-side in a circularly symmetrical manner, and the overall height of the lightning arrester is reduced to withstand high voltage and increase mechanical strength. can.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a conventional lightning arrester, FIG. 2 is a cross sectional view taken along the line - in FIG. 4 is a plan view showing the arrangement of the stack groups of the lightning arrester according to the present invention, FIG. 5 is a plan view of an embodiment with another arrangement, and FIG. 6 is a cross section showing another arrangement of the stack groups. It is a diagram. 1...Non-linear resistor, 2...Insulated pipe, 3...
... Compression spring, 4 ... Metal connection plate, 5, 7 ... Insulator, 6 ... Connection conductor, 8 ... Pillar, 9 ... Insulation rod,
A, B, C, D...Stack of nonlinear resistors.

Claims (1)

[Claims] 1. A plurality of divided stacks, each consisting of a nonlinear resistor stacked with an insulator interposed and electrically separated into an appropriate number of groups, are arranged in parallel between upper and lower metal connection plates. In the lightning arrester comprising a stack in which all of the non-linear resistors are electrically connected in series by holding and sequentially and alternately connecting the separated groups of the divided stacks by connecting conductors, A lightning arrester characterized in that a plurality of stacks are integrally arranged symmetrically about the center of a circle.