JPS596041B2 - Lightning arrester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved lightning arrester with low self-inductance.

Generally, when a particularly steep current flows through a lightning arrester, the voltage induced in the self-inductance becomes excessive, resulting in a significant increase in the arrester limit voltage.

As a result, protection characteristics may deteriorate and insulation coordination may not be achieved.

Therefore, it is important to keep the inductance of the lightning arrester itself as low as possible.

By the way, it is necessary to keep the overall height of a conventional gas insulated lightning arrester low due to its installation conditions, and a structure as shown in FIGS. 1 and 2 is generally adopted.

That is, 11A, 11B, and 11C are internal elements each formed by stacking a plurality of characteristic element units 12 with an insulating plate 13 in between, and these internal elements 11A, 11B.

11C has a three-column structure as shown in the figure, and the characteristic element units 12 of each internal element are 11A-11B- from the top.
11C-11A-11B . . . The internal elements are connected in series via the connecting plate 14 in a substantially spiral shape in one direction.
The uppermost characteristic element unit of IIA is connected to the line terminal U, and the lowermost characteristic element unit of the internal element 11C is connected to the ground terminal V.

However, in such a structure, in addition to the self-inductance of the characteristic elements and the connecting plate, inductance is generated due to the linkage of magnetic flux generated by the current loop, and the latter is much larger than the former, resulting in a reduction in the protective properties. There was a drawback.

The present invention eliminates the above-mentioned drawbacks and provides a lightning arrester with low self-inductance and excellent protection characteristics.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 3 and 4, 11A. 11B, 11C
are internal elements each formed by stacking a plurality of characteristic element units 12 with an insulating plate 13 in between, and each of the internal elements 11A to
11C is on the same line with a constant interval 11A-11B-1
They are arranged in the order of 1C.

Each characteristic element unit 12 at the top of the internal elements 11A to 11C
are connected in series in the arrangement direction by a connecting conductor 14, and the series termination is connected to the characteristic element unit 12 at the next stage of the internal element 11A by a connecting conductor 15 that passes between the stages in the arrangement direction.

Similarly, the characteristic element units 12 at the next stage of the internal elements 11A to 11C are connected in series in the arrangement direction in each stage, and the series terminations are connected in series to the opposite end of the series characteristic element unit in the next stage. .

A line terminal U and a ground terminal V are led out from the ends of the top and bottom tiers.

The insulating plate 12 between the crotches of the internal element 11B is divided into two parts in the thickness direction, and the connecting conductor 15 is inserted between them.

With such a configuration, the flow of the discharge current during operation is such that the current direction in each stage of the internal element and the current direction between stages are opposite to each other, as shown by the arrows, so no current loop is formed and the self-inductance is reduced. can be effectively reduced.

Therefore, the rise in the arrester limit voltage is suppressed and the protection characteristics are improved.

Although the above embodiment is a combination of three internal elements,
It goes without saying that three or more internal elements can be combined depending on the voltage class.

Moreover, especially when processing a large current surge, a plurality of sets of the above-mentioned internal elements can be connected in parallel and used.

As described above, according to the present invention, it is possible to provide a lightning arrester with small self-inductance, excellent protection characteristics, and short overall height.

[Brief explanation of the drawing]

1 and 2 are a plan view and an exploded side view of a conventional lightning arrester, and FIGS. 3 and 4 are a plan view and a side view showing an embodiment of a lightning arrester according to the present invention. 11A, 11B, 11C... Internal elements, 12.
...Characteristic element unit, 13-...Insulation plate, 1
5...Insulated conductor.

Claims (1)

[Claims] 1 At least the first to third internal elements, each consisting of a plurality of characteristic element units stacked in multiple stages via insulating plates, are
The characteristic element units of each internal element are arranged linearly in a line in the order of
are connected in series on the array line in this order, and the series termination of the series characteristic element unit of each stage is connected in series to the opposite side of the series termination of the series characteristic element unit of the next stage by a connecting conductor that passes between the stages on the array line. A lightning arrester characterized by: