JPS6025174A - Discharge type 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 The present invention relates to a discharge type lightning arrester, and more particularly to a discharge type lightning arrester such as a cold cathode discharge tube having a discharge electrode coated with a cathode material.

Conventionally, for example, a discharge type lightning arrester has a pair of discharge poles that are airtightly attached to openings at both ends of a cylinder made of an insulating member, and are arranged opposite to each other so as to form a discharge gap within the cylinder. Lower the voltage,
In addition, in order to increase the operating capacity, it is known that an active material having a small work number, ie, a cathode material, is deposited on the surface of the discharge electrode to facilitate electron emission. In this conventional discharge type lightning arrester, when an abnormal supersulfur pressure such as a surge is applied to a pair of discharge poles, for example,
Due to electron emission from the cathode material, 91
It is designed to bury surges and the like beyond the arc discharge, which is the main discharge.

However, the cathode materials used in the above-mentioned conventional discharge type lightning arrester are 1, for example, titanium element, and 1. The conventional cathode material is composed of a mixture mainly composed of sodium silicate and sodium silicate with a ratio of /i0. As shown in Figures 1 and 2, when an excessive voltage such as a surge is applied to the discharge terminals of a discharge type lightning arrester, as the surge progresses, the There is a tendency for the discharge sustaining voltage and the wake-up start voltage to be lower than the initial discharge sustaining voltage and discharge start-up pressure, respectively.For example, if the above-mentioned conventional discharge type earth arrester is subjected to a surge of waveform i oxiooooμδ and current of 100A, When repeated discharge operations are performed by repeatedly applying the voltage 150-19 times, the discharge sustaining voltage in particular decreases as the number of discharge operations increases.
The rear Q, discharge, and discharge sustaining voltages are reduced by about 50 cm compared to the initial values. Therefore, if the discharge sustaining voltage or the discharge starting voltage decreases in this way, a follow-on current will occur, which may shorten the life of the lightning arrester, cause damage to the equipment to be protected, or reduce the protection performance of the lightning arrester. In addition, in order to eliminate these drawbacks, for example, it is possible to set the lightning arrester in consideration of the decrease in the discharge sustaining voltage and discharge starting voltage, but setting it in this way will reduce the protection performance of the lightning arrester. There are drawbacks such as a significant loss of reliability.

The present invention was made in response to the above circumstances.

The purpose of this is to be able to maintain the discharge sustaining voltage and discharge starting voltage at approximately the same initial value at all times, regardless of the number of times surges are applied, and to effectively block follow-on current. An object of the present invention is to provide a discharge type lightning arrester that can improve reliability and extend its life.

As a result of extensive research into the cathode materials of this type of discharge type lightning arrester, the inventors of the present invention found that the main component of the cathode material is a metal blade or a metal compound consisting of an alkali metal, an alkaline earth metal, or a mixture of these metals. By using a mixture of 5 to 25 times the amount of borosilicate glass and applying it to the discharge electrodes, the discharge sustaining voltage and discharge starting voltage will remain approximately constant even after repeated application of surges, etc. It has been found that a discharge-type surge arrester can be obtained which can hold the current, effectively block the following current, and sufficiently satisfy various performances as a surge arrester, such as reliability and life.

The discharge type lightning arrester according to the present invention is made of a metal compound made of a metal element or metal compound made of an alkali metal, an alkaline earth metal, or a mixture of these metals, mixed with borosilicate glass in an amount of 5 to 25 times by weight. By using the above-mentioned specific mixture as the main component of the cathode material, it is possible to eliminate all the drawbacks of the conventional discharge type lightning arrester. An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a characteristic diagram showing the relationship between the discharge sustaining voltage and the number of surges in a discharge type arrester according to an embodiment of the present invention, and FIG. It is a characteristic diagram showing a relationship.

As an embodiment of the present invention, a metal element or a metal compound consisting of an alkali metal, an alkaline earth metal, or a mixture of these metals is used, and each of these components is added in a weight ratio of 5 to 25 times. The cathode materials were prepared by mixing borosilicate glasses with . . Discharge type lightning arresters were made by depositing each of these cathode materials on the discharge poles, and a surge with a waveform of 10 x 100 μS and a current of 320 A was applied 200 times during the discharge of each of these lightning arresters. .

As shown in Figures 3 and 4, it has been experimentally confirmed that the discharge sustaining voltage and discharge starting voltage each maintain approximately the same value as the initial value, regardless of the number of surges. .

Further, in the above-mentioned embodiment of the present invention, the follow-on current during the discharge operation was effectively blocked, and the various performances as a lightning arrester were sufficiently satisfactory.

In the present invention, the amount of borosilicate glass contained in the cathode material is selected to be 5 to 25 times the weight of the metal element or metal compound made of an alkali metal, alkaline earth metal, or a mixture of these metals. The reason for this is 1. For example, if the amount of borosilicate glass is 5 times the amount of M,
Compared to the case where borosilicate glass is not mixed at all, the decrease in discharge sustaining voltage and discharge starting voltage due to repeated discharge operations is improved to a moderate degree.

This is because sufficient characteristics cannot yet be obtained, and if the amount of borosilicate glass exceeds 25 times the weight ratio, the discharge sustaining voltage will become higher than the initial value [for example, if the amount of borosilicate glass exceeds 25 times the initial value (for example, if the amount of borosilicate glass is 30 times the When the amount of acid glass is added and mixed, it becomes about 150% of the initial value], so the follow-on current interruption during discharge operation is good, but the performance as a lightning arrester, i.e., the start of electricity change, the city pressure, the shock wave number, the city characteristics, etc. This is because this is not a desirable characteristic.

As described above, according to the present invention, by using a specific cathode material as the cathode material deposited on the discharge electrode, the discharge sustaining voltage and the discharge starting voltage can be maintained at all times regardless of the number of times surges or the like are applied. It can be maintained at a constant value that is approximately the same as the initial value. Therefore, this makes it possible to effectively block the follow-on current during the discharge operation, and has excellent effects such as improving the performance and reliability of the lightning arrester as well as extending its lifespan. .

Note that the discharge type lightning arrester according to the present invention is not limited to, for example, a cold cathode discharge tube, and generally any gap type discharge type lightning arrester can be used without being limited to its shape, structure, scale, etc. Of course, it can be applied to

[Brief explanation of drawings]

Figures 1, 5, and 2 are graphs showing the relationship between the discharge sustaining voltage and the discharge starting voltage with respect to the number of surges in a conventional discharge type lightning arrester, respectively. FIGS. 3 and 4 are characteristic diagrams showing the 146th relationship of the discharge sustaining voltage and discharge starting voltage with respect to the number of surges of a discharge type lightning arrester according to an embodiment of the present invention. Applicant's agent Takehiko Takehiko, Patent Attorney Dosu Figure 1 Number of numbers --- 30th Surge ゛■ Male - 2nd [1 f-shi゛0min - 4th [1 Surge''' number →

Claims (1)

[Claims] 5 in direct comparison to a metal element or metal compound consisting of an alkali metal or an alkaline earth metal or a mixture of these metals.
A discharge type earth arrester characterized in that a cathode material whose main component is a mixture of ~25 times as much borosilicate glass is adhered to a discharge electrode.