JPS59203388A - 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] [Technical Field of the Invention] The present invention relates to a lightning arrester used for protecting electrical equipment in a power transmission and distribution system. Regarding lightning arresters.

[Technical background of the invention and its problems]

As is well known, lightning arresters protect electrical equipment on power transmission and distribution lines by limiting the surge voltage caused by lightning.

Conventionally, such a lightning arrester is equipped with a discharge gap and a characteristic element, and upon the arrival of the surso voltage caused by lightning, the discharge section first causes a discharge, and a lightning current flows through one characteristic element, and the lightning current flows through the characteristic element until the discharge ends. Then the commercial frequency current
#) It is designed to cut off the following flow and return to the original state.

FIG. 1 shows the cross-sectional structure of a lightning arrester equipped with this type of discharge section. In the figure, 1 is a hollow tube whose upper and lower parts are closed by upper and lower lids 2 and 3 to form a sealed structure. Further, 4 is a resistor having non-linear voltage-current characteristics, and 5 is a discharge section provided in series with the non-linear resistor 4, which are housed inside the tube 1 as shown in the figure. Here, the discharge section 5 includes a pair of upper and lower discharge electrodes 6a and 6b having gears of a predetermined length and arranged opposite to each other, and a cylinder disposed between each of the electrodes 6a and 6b and supporting them on both end surfaces. It is composed of an insulating member 7 made of ceramic or the like. Meanwhile, after teasing the upper lid 2 outwardly, the tube 1
A T-shaped line conductor 8 is provided by penetrating the inside, a spring 9 is arranged between the T-shaped part side and the discharge part 5, and each of the above elements is connected between the power transmission line 10 and the ground. This constitutes a lightning arrester. In the figure, 11 and 12 are the upper and lower backings.

In such a lightning arrester, when a surge voltage enters due to lightning, it is necessary to quickly discharge the surge voltage and shunt it to the ground to protect the surge voltage. However, in response to sudden overvoltages such as lightning surges, there is generally a delay in discharge,
There is a lot of variation, and as shown in Figure 2, the characteristics of V-
- becomes higher than the upper limit expected value of the characteristics, and the required discharge characteristics cannot be obtained in many cases.

Therefore, in order to solve this problem, the discharge section 5
It has been considered to provide an ion irradiator in parallel with the discharge electrodes 6a and 6b to generate a corona discharge before the discharge electrodes 6a and 6b discharge, thereby stabilizing the discharge characteristics. However, it is not foolish to newly provide separate ion irradiators, which impairs economic efficiency, and also complicates the configuration and reduces reliability. This is disadvantageous for lightning arresters.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a lightning arrester that can have excellent discharge characteristics without sacrificing economic efficiency or reliability.

[Summary of the invention]

In order to achieve the above object, the present invention provides a lightning arrester that houses a non-linear resistor in which a discharge part is connected in series in a sealed container, the discharge part being supported at both ends of a cylindrical insulating member with a gap of a predetermined length. and a pair of discharge electrodes provided at both ends of the cylindrical insulating member, the surface of which is fully coated with conductive or semiconductive paint, and having a gap length longer than the gear f length of the pair of discharge electrodes. It is characterized by comprising at least a pair of ion irradiation electrodes.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below.

FIG. 3 shows a partial cross-sectional view of an insulating member in a lightning arrester equipped with a discharge section according to the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals.

That is, in the lightning arrester of this embodiment, on the inner surface of the upper and lower ends of the cylindrical insulating member 7 constituting the discharge section 5,
A pair of ion irradiation electrodes 13a and 13b having a predetermined gap are constructed by applying conductive or semiconductive paint to the entire needle shape. Note that in this example, the discharge electrodes 6a, 6
In order to improve contact with b, both end surfaces 14 of the insulating member 70
A and 14b are also coated with the above paint over their entirety. In the above, a pair of ion irradiation electrodes 13a, lS
The gap length between the pair of discharge electrodes 6ar and 6b is
The gap length is also selected to be sufficiently large (for example, 5 times) to prevent main discharge from occurring between the ion irradiation electrodes 13a and 1'Sb.

In the lightning arrester having such a structure, the discharge portion 5 ensures sufficient whistle resistance on the high voltage side under normal conditions.

If a surge voltage due to lightning arrives from such a situation,
First, the discharge electrodes 6h and 6b generate a discharge, and the lightning current at this time is absorbed by the ground through the nonlinear resistor 4. After the absorption of this lightning current is completed, a commercial frequency current flows as a follow-on current, and this follow-on current is cut off and the original state is restored to protect against surge voltage. In this case, the ion irradiation electrode 13a is used for the surge voltage.

13b causes a corona discharge to occur between the discharge electrodes 6a and 6b before a main discharge occurs between the discharge electrodes 6a and 6b due to local electric field stress at the tip of the electrode, and supplies ions between the discharge electrodes 6a and 6b; The same effect as an ion shield will be performed. Therefore, even with overvoltages such as surge voltages, the discharge delay and variations can be eliminated, and the desired discharge characteristics can be obtained.

As described above, the lightning arrester according to the present embodiment has a conductive or semi-conductive paint applied in the form of needles to the inner surface of both ends of the cylindrical insulating member 7 constituting the discharge section 5. A pair of ion irradiation electrodes 13a and 13b having a gap are configured.

Therefore, in order to stabilize the discharge characteristics, instead of providing a separate ion irradiator as in the past, a cylindrical insulating member 7 gold, which is a component of the discharge section 5, is used, which is equivalent to the ion irradiator. It becomes possible to have the effect of With that,
It is possible to obtain a lightning arrester having extremely excellent discharge characteristics without impairing reliability due to economical efficiency or complication of the structure.

It should be noted that the present invention is not limited to the above embodiments, but can also be implemented as follows.

(a) In the above embodiment, the shape of the ion irradiation electrode is needle-like, but the shape is not limited to this, for example, as shown in FIG. You can also use it as

(b) In the above embodiment, the ion irradiation electrodes were configured as one pair, but the configuration is not limited to this, and a plurality of pairs of two or more pairs may be used.

(e) In the above embodiment, the ion irradiation electrode is connected to the insulating member 7.
Although it is formed on the inner surface of the holder, it may be formed on the outer surface.

(d) As the insulating member 7, a high dielectric material such as barium titanate may be used.

〔Effect of the invention〕

As explained above, according to the present invention, conductive or semi-conductive paint is applied to the surfaces of both ends of the cylindrical insulating member constituting the discharge section, and at least one pair of insulating members having a predetermined gap are formed. Since the ion irradiation electrode was configured,
It is possible to provide a lightning arrester equipped with a discharge section that can have extremely excellent discharge characteristics without impairing economic efficiency or reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a surge arrester with a discharge gap, FIG. 2 is a characteristic diagram of a conventional discharge gear, and FIGS. FIG. 3 is a cross-sectional perspective view showing examples. l... Paddle pipe, 2, 3... Upper and lower lids, 4...
・Non-linear resistor, 5...discharge part, 6a + 6b...
・Discharge electrode, 7... Insulating member, 8... Line conductor, 9
...Spring, 10...Power transmission line, 11.12...
・Upper and lower knocking, 13 a, 13 b
, 15a, 15b - ion irradiation electrode, 14
a, 14b... end face of insulating member. Applicant's representative Patent attorney Takehiko Suzue No. 1 @ Figure 2 Figure 3 Figure 4 Figure 4b

Claims (2)

[Claims] (1) In a lightning arrester containing a non-linear resistor in which a discharge portion is connected in series in a sealed container, the discharge portion includes a pair of discharge electrodes having a gap of a predetermined length supported at both ends of a cylindrical insulating member; provided at both ends of the cylindrical insulating member,
A lightning arrester comprising at least a pair of ion irradiation electrodes having a surface coated with a conductive or semi-conductive paint and having a gear horn length greater than the gear horn length of the pair of discharge electrodes. (2) The lightning arrester according to claim (1), wherein the ion irradiation electrode has a needle shape, a rod shape, or a round shape.