JPS59149004A - Tank-shaped zinc oxide arrester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a tank-type zinc oxide lightning arrester, which is constructed by stacking zinc oxide elements (hereinafter referred to as elements) with particularly excellent nonlinearity in a tank. This relates to a tank type zinc oxide lightning arrester.

[Prior art]

There are two types of lightning arresters: tank type and insulator type, but in Japan, the former tank type is often used for gas insulated substations (GIS) because it is difficult to acquire land for substations due to the concentration of electricity demand in cities. has been done. In particular, lightning arresters used for transmission voltages of 1000 kV, which are currently under consideration, play an important role in significantly reducing the standard impact insulation strength (BIL), and their size must be in line with other gas scoop equipment. It needs to be something.

A conventional example of a tank-type zinc oxide lightning arrester based on this trend is shown in FIG. As shown in the figure, the tank-type zinc oxide surge arrester is constructed by stacking highly nonlinear elements 2 in the tank 1 in the axial direction approximately in the center of the tank 1.

A high voltage shield 3 is attached to the high voltage side of this element 2 to make the voltage distribution between the elements 2 uniform. The high voltage side element 2a, that is, the high voltage side element 2a is connected to the connecting conductor 4.
It is electrically connected to other gas insulated equipment via the spacer 5.

When downsizing a tank-type zinc oxide surge arrester configured in this way, the potential distribution between the elements 2 is distorted because the ground capacitance of the element 2 with respect to the earth, that is, the tank 1 is particularly large in the tank type. A special high-voltage shield 3 as described above is employed to make the potential distribution uniform. However, even if the high voltage shield 3 is provided in this manner, the potential distribution tends to be concentrated on the high voltage side. In the same figure, 2
b is the grounding side element, t is the distance between the high voltage shield 3 and the tank 1, L is the radial distance between the element 2 (high voltage side element 2a) and the tank 1, and A is the high voltage side element 2a and the grounding. Side element 2
This is the connection part with b.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a tank-type zinc oxide lightning arrester in which the potential distribution in the intermediate portion of the element is improved.

[Summary of the invention]

That is, the present invention divides the stacked elements into a high voltage side element and a ground side element, and supports the space between this divided part and the tank with an insulator smaller than the radial distance between the high voltage side element and the tank. It is characterized by the following.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. FIG. 2 shows an embodiment of the invention. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and their explanations will be omitted.

In this embodiment, the stacked elements 2 are divided into a high voltage side element 2a and a ground side element 2b. (corresponding to A in FIG. 1) and the tank 1, t4 is supported by an insulator 6 smaller than the stacking dimension t3 of the ground side elements. By doing this, the divided part A is created. Due to the addition of the capacitance between the tank 1 and the tank 1, the division part A is divided. The ground capacitance of Ao becomes larger than before, and the potential of the divided part Ao becomes relaxed.

In other words, a tank-type zinc oxide lightning arrester with improved potential distribution in the intermediate portion of the element 2 can be obtained.

That is, the high voltage side element 2a and the ground side element 2b are arranged on parallel axes, and the ground side element 2b is arranged on the high voltage side element 2.
It was composed of a plurality of units (not shown) arranged around the outer periphery of a. By doing this, the potential at the intermediate portion of the element 2 is relaxed as described above, and the dimension t of the ground side element 2b is the dimension t4 of the insulator 60 supporting the high voltage side element 2a.
The value is freely selected within a large range and within a range where the dimension t2 between the ground side shield 7 and the high voltage shield 3 is sufficiently larger than the dimension t between the high voltage shield 30 and the ground. be able to. Furthermore, since it is possible to connect units arranged in parallel, it is also possible to reduce the diameter of the ground side element 2b.

In this embodiment, the husband's ground side of the divided ground side element 2b is connected to the ground wire 9 via the ground side shield 7 and the sealed terminal 8.
Although the case where each unit is grounded is shown in the figure, it is not limited to this, and the grounding side of a plurality of units may be connected to a common grounding line. In this way, the high voltage side element 2
It also becomes easy to adjust the wiring distance between a and a.

Furthermore, as mentioned above, since the potential at the middle part of element 2 is relaxed, it is possible to configure a tank-type zinc oxide lightning arrester so that it can be stored within the transportation limit while remaining vertical, and it is possible to configure the tank-type zinc oxide lightning arrester so that it can be stored within the transportation limit while remaining vertical. It can facilitate binding.

Another embodiment of the invention is shown in FIG.

In this embodiment, the ground side elements 2b are stacked in the radial direction of the tank 1 in a direction perpendicular to the high pressure side elements 2a. If the ground side is grounded via the sealed terminal 8 and the ground wire 9, this not only eliminates the need for an insulator to support the ground side element 2b, but also allows the ground side element 2b to be placed inside the tank 1. Since it is parallel to the equipotential line, the electric field in the tank 1 is not disturbed by the ground side element 2b.

〔Effect of the invention〕

Divide the stacked elements into high voltage side elements and ground side elements,
In addition, since the space between this split part and the tank is supported by an insulator that is smaller in size than the ground side element, the distance between the split part and the tank is smaller than before, and the middle part of the split part, that is, the element, is smaller than before. It is possible to obtain a tank-type zinc oxide lightning arrester in which the ground capacitance is increased and the potential in the intermediate portion is relaxed, and the potential distribution in the intermediate portion of the element is improved.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional tank type zinc oxide arrester, Figure 2
FIG. 3 is a block diagram of one embodiment of the tank type zinc oxide lightning arrester of the present invention, and FIG. 3 is a block diagram of another embodiment of the tank type zinc oxide lightning arrester of the present invention. DESCRIPTION OF SYMBOLS 1...Tank, 2...Zinc oxide element, 2a...High voltage side element, 2b...Grounding side element, 3...High voltage shield, 6...Insulator, 7...Grounding side Shield, Ao・
...Divided part, L...Radial distance between the high pressure side element and the tank. Agent Patent attorney Hiroo Nagasaki (and 1 other person) (7) $1 1st $3 b 17-72' /8 -/7

Claims (1)

[Claims] 1. In a tank-type zinc oxide lightning arrester in which zinc oxide elements with excellent nonlinearity are stacked in a tank, the stacked elements are divided into a high voltage side element and a ground side element, and 1. A tank-type zinc oxide lightning arrester, characterized in that an insulating material smaller than the stacked size of the ground side elements is supported between the divided portion and the tank. 2. A patent in which the high-voltage side element and the ground-side element are arranged on substantially parallel axes, and the ground-side element is composed of a plurality of units arranged around the outer periphery of the high-voltage side element. A tank type zinc oxide lightning arrester according to claim 1.