JPS5950202B2 - gear press lightning arrester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gapless lightning arrester in which a nonlinear resistor with good nonlinearity, for example, a nonlinear resistor whose main component is a metal oxide, is arranged in series and housed in a container.

Generally, this type of device employs a configuration as shown in FIG.

That is, in FIG. 1, 1 is a non-linear resistor connected in parallel by a metal connection plate 6, and a predetermined number of resistor units A are stacked in series to form an internal element, which is housed in a metal container 2. .

3 is an insulator through which the high voltage side terminal 4 of the lightning arrester is passed.

5 is a gas sealed in the container 2.

The electrical equivalent circuit of FIG. 1 is as shown in FIG. 2.

In FIG. 2, R is the resistance of the nonlinear resistor 1 itself, C is the capacitance container of the nonlinear resistor 1 itself, and Co is the capacitance with respect to the metal container 2.

AC voltage is constantly applied to lightning arresters in AC systems, but
At this time, the resistance value of the nonlinear resistor 1 is extremely large.

Therefore, the potential distribution in the height direction of a lightning arrester with height H is as shown by curve I in FIG.

That is, due to the influence of the electrostatic container Co on the metal container 2, a large voltage is applied to the non-linear resistor near the high-voltage side terminal 4 on the upper part of the lightning arrester.

Therefore, the current flowing through the resistor R of the non-linear resistor 1 increases in the upper part of the lightning arrester, and the upper part of the lightning arrester is heated.

Generally speaking, the higher the temperature of an object, the greater the deterioration of the object, so it is desirable to suppress heating of the upper part.

Therefore, the present invention was made in view of the above points, and it is possible to suppress the heating of the upper part of the non-linear resistor of a gapless surge arrester, which is constantly energized, to equalize the heating, and to equalize the deterioration of the non-linear resistor. The purpose is to obtain a gapless surge arrester.

FIG. 4 is a sectional view of one embodiment of the present invention.

Reference numeral 11 denotes a non-linear resistor mainly composed of metal oxide which is connected in parallel by a metal connecting plate 16 in a two-column arrangement, and in the illustrated embodiment, four units are stacked in series.

12 is a metal connection plate at the bottom, and non-linear resistors mainly composed of metal oxides are arranged in three columns as shown in FIG. In the illustrated embodiment, six resistors are stacked.

This connects the nonlinear resistors 12 and 11 in series.

The internal elements formed as described above are housed in a metal container 13 filled with an insulating gas.

Metal connection plate 13 of non-linear resistor 12 placed on the high voltage side
A high-voltage side terminal 14 is led out through an insulating spacer 15.

Note that other configurations can be adopted for this derivation structure.

For example, attach an intermediate conductor to an insulating spacer, connect the end of the high voltage side terminal to the metal container 13 side of this intermediate conductor,
The configuration is such that a high voltage side terminal is separately attached to the other side of the intermediate conductor.

In the above embodiment, the internal elements are housed in a metal container, but they may be housed in an insulator tube 17 as shown in FIG. 6, where the same parts are given the same reference numerals.

18 and 19 indicate terminal plates. Next, the present invention will be explained in detail.

In FIGS. 4 to 6, the number of parallel connections of the upper (high voltage side) nonlinear resistors 12 is greater than that of the lower (ground side) nonlinear resistors 11.

Therefore, due to the unequal potential distribution, the upper nonlinear resistor 12
Even if a larger current flows than the nonlinear resistor at the bottom,
The resistance current per unit area of the upper non-linear resistor 120 can be made smaller than that of the lower non-linear resistor 11.

Therefore, heating of the upper non-linear resistor 12 can be suppressed.

Figure 6 shows a case where it is housed in an insulator, but since there is a capacitance to the ground, it operates in the same way as above.

Furthermore, the present invention can implement the following aspects.

In the embodiment shown in FIG. 7, the upper non-linear resistors 12 are arranged in parallel, and the lower non-linear resistors 11 are arranged in series.

The diameter a1 of the container 13 facing the upper non-linear resistor 12 is made larger than the diameter a2 of the lower portion to prevent the upper capacitance to the container from increasing.

In the embodiment shown in FIG. 8, the upper non-linear resistors 12 are stacked with an insulator 18 in between to form each unit C.
These units C are connected in parallel via connecting plates 19 and 20, respectively.

With this configuration, the internal elements can have a single pillar configuration from top to bottom.

As described above, the present invention can provide a gapless lightning arrester that can suppress heating of the upper part (high voltage side) of a nonlinear resistor and equalize deterioration of the nonlinear resistor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional lightning arrester, FIG. 2 is a schematic equivalent diagram of FIG. 1, FIG. 3 is a diagram explaining the potential distribution of the lightning arrester, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIGS. 6 to 8 are sectional views of other embodiments of the present invention. 11... Ground side (lower) non-linear resistor, 12.
...High voltage side (upper) non-linear resistor, 13...
...Metal container, 130...Metal connection plate, 14.
...High voltage side terminal.

Claims (1)

[Claims] 1. In a structure constructed by stacking nonlinear resistors with good nonlinearity, for example, nonlinear resistors mainly composed of metal oxides, the nonlinear resistors on the high voltage side are connected in parallel. A gapless lightning arrester has more non-linear resistors connected in series on both pressure sides than the ground side, and the internal elements are housed in a container. 2. The gapless lightning arrester according to claim 1, wherein the container is a metal container. 3. The gapless lightning arrester according to claim 1, wherein the container is a porcelain tube. 4. The gapless lightning arrester according to claim 1, wherein the nonlinear resistors on the high voltage side and the ground side are configured in parallel. 5. The gapless lightning arrester according to claim 1, wherein the non-linear resistors on the high voltage side and the ground side have a single pillar configuration.