JPH0246677A - Surge absorption device - Google Patents

Abstract

PURPOSE:To obtain a high surge resisting quantity by connecting not less than two surge absorption means, wherein gap type discharge tubes and varisters are in series connected, electrically and in parallel. CONSTITUTION:A plurality of surge absorption means c1 to cn, wherein gap type discharge tubes a1 to an and varisters b1 to bn are in seies connected, are connected in parallel. Accordingly, when surge voltage is impressed on a surge absorption device and a current flows through the gap type discharge tubes a1 to an of one of those surge absorption means c1 to cn, the other surge absorption means c1 to cn are made to operate with the voltage generated by the resistance value of the varisters b1 to bn of the surge absorption means c1 to cn, through which the current flows, to surely divide the surge current to respective surge absorption means c1 to cn. Thereby, a surge resisting quantity can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a surge absorber, and particularly to a surge absorber having a high surge resistance.

[Conventional technology] Conventionally, surge absorption elements that absorb surge voltage include
Voltage nonlinear resistors such as gap type surge absorbers or zinc oxide varistors are widely used. Among these, in a gap type surge absorber (hereinafter referred to as a "gap type discharge tube"), when the surge current applied to one gap type discharge tube is expected to exceed the surge withstand capacity of that discharge tube. There is a method of increasing surge resistance by electrically connecting a plurality of gap type discharge tubes in parallel.

[Problems to be Solved by the Invention] If there is even a slight difference in the surge response characteristics of gap-type discharge tubes connected in parallel, the surge will be concentrated only in those with good surge response. For this reason, as the current flows unevenly, a current that exceeds the limit flows only in the discharged gap type discharge tube, and this element is destroyed. Therefore, even if multiple gap type discharge tubes are connected in parallel, the overall There were cases where the surge resistance could not be increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and provide a surge absorbing device that can reliably shunt surge current and has a high surge withstand capacity.

[Means for Solving the Problems] The surge absorption device of the present invention includes two or more surge absorption means each electrically connected in parallel, each consisting of a gap type discharge tube and a varistor connected in series. Features.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing a surge absorbing device according to an embodiment of the present invention.

As shown in the figure, the surge absorbing device of the present invention includes gap type discharge tubes al+a2...an and varistors bl, b2...
surge absorbing means c1.bn connected in series, respectively. c2...cn are electrically connected in parallel in two or more pieces (n pieces in FIG. 1).

The gap type discharge tube used in the present invention is not particularly limited as long as its discharge starting voltage is higher than the maximum circuit voltage of the circuit used.

Further, the varistor used in the present invention is not particularly limited as long as it is a resistance element that exhibits voltage non-linearity, but preferably exhibits a high resistance value when current flows and generates a high voltage. What you do is effective.

The method of assembling the surge absorber of the present invention using these gap type discharge tubes and varistors is not particularly limited, but if the shape is to be stabilized, the entire body may be covered with an appropriate coating material. The covering material may preferably be a case with good insulation, an insulating covering material, or a heat-shrinkable tube, but is not particularly limited to these. Also, as a method for connecting each element, Caulking, soldering, wiring with a board, etc. are suitable, but are not particularly limited to these as long as they have the required surge resistance.

In the present invention, two or more surge absorbing means formed by connecting gap-type discharge tubes and varistors in series are connected in parallel, but there is no particular restriction on the number of surge absorbing means to be connected, and it depends on the purpose of use. An appropriate number of them are connected depending on the degree of surge current to be applied.

[Function] In the surge absorbing device of the present invention, by connecting two or more surge absorbing means formed by connecting a gap type discharge tube and a varistor in series in parallel, a surge voltage is applied to the surge absorbing device, and one of the surge absorbing means is connected in parallel. When current flows through the gap-type discharge tube of the surge absorbing means, other surge absorbing means are activated by the voltage generated by the resistance value of the varistor of the surge absorbing means through which the current flows, ensuring that the surge current is absorbed by each surge absorbing means. It can be divided into

That is, when a surge voltage is applied to the surge detection device as shown in Fig. 1, first the gap type discharge tube AL+82.
- A discharge occurs in any one of the gap-type discharge tubes having good discharge response among e a n, for example, a. At this time, a voltage is generated between B, -B, and ' that is the product of the discharged gap type discharge tube al, the phase number of the resistance value of the varistor bl connected in series with the punch, and the current value flowing into it. ,
Since this voltage is also applied between 82 and 82' and between -B and -Bn', other gap type discharge tubes a2'''
A discharge can also be generated in a rl.

For example, in a surge absorbing device formed by connecting two surge absorbing means C+ and c2 in parallel, when a surge is applied to the device, a discharge occurs in one of the gap-type discharge tubes al, which has good discharge response. As it occurs, B1-B1
A voltage is generated between 82 and 82', which is the product of the sum of the resistance values of the discharged gap type discharge tube al and the Paris star b+ and the flowing current value, and this voltage is also applied between 82 and 82'. Therefore, discharge also occurs in the other gap type discharge tube a2. The resistance value of the gap type discharge tube during discharge is very small compared to the varistor, and by keeping the varistor voltages of the two varistors bl and b2 equal, the surge current after discharge is equalized by the surge absorption means CI + C2. It is divided into

This discharge mechanism is similar to the surge absorbing means c.

The same applies when three or more c2...cn are connected in parallel, and the surge current is absorbed by the surge absorbing means C connected in parallel.
It is equally divided into I + e * ”” e n.

Therefore, by increasing the number of surge absorbing means connected in parallel, the surge resistance can be increased.

It is clear from the graph of FIG. 2 that the surge withstand capacity is increased by increasing the number of parallel surge absorbing means. In FIG. 2, the horizontal axis shows the number of parallel surge absorbers, and the vertical axis shows the surge withstand capacity of the surge absorber. According to this, the surge withstand capacity A of the surge absorber of the present invention is shown.
increases in proportion to the number (n) of surge absorption means connected in parallel, and the surge resistance when n surge absorption means are provided is the surge resistance A+ when there is one surge absorption means. The relationship An x AI Xn holds true.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Example 1 As shown in FIG. 3, the gap type discharge tube aI.

A surge absorption device was assembled in which two surge absorption means CI and C2, in which a2 and a varistor b l * b 2 were connected in series, were connected in parallel. Lead wire 1 was used for connection, and connection was made by caulking 2. Further, the entire device was covered with an insulating case 3.

The gap type discharge tubes al and az used have gas sealed inside, and their discharge starting voltage is 300V.
It is. The varistor b I * b 2 has a varistor voltage specified to be 220V.

The surge absorbing means CI +02, in which these were connected in series, had a surge withstand capacity of 2000A.

When we measured the surge resistance of this surge absorber, we found that it was 4.
000A, which is twice as much as one surge absorbing means.

Example 2 Figure 4 (circuit diagram), Figure 5 (plan view, case 3
The upper surface and filler 5 are not shown.), Fig. 6 (Fig. 5 V
As shown in FIG. '/B type discharge tube al
+ a2+ 83h a++ 85 and barista b+, b
2. bs, b4. Five surge absorbing means c1゜C2* cs, ca 1 ca each connected in series with bs
In this embodiment, a surge absorption device was assembled in which the surge absorbers were connected in parallel.These were connected on a board 4, and the whole was housed in an insulating case 3. Further, the space inside the case 3 was filled with an insulating filler 5. Gap type discharge tube al~a5
The varistors bl to b5 were connected using caulking 2, which was soldered 6 to the board 4.

7 is an electrode.

Note that the gap type discharge tubes a1"-ca5 used have a gas sealed inside, and the discharge starting voltage is to
It is oov. Varistor blNb6 has a varistor voltage of 4
70v. The surge withstand capacity of each of the surge absorbing means C1 to C5 connected in series was 2000 A as in the first embodiment.

When we measured the surge withstand capacity of this surge absorber, we found that it was 1
00OOA, which was five times that of one surge absorbing means.

[Effects of the Invention] As detailed above, according to the surge absorption device of the present invention,
The current discharged by the surge voltage can be reliably shunted, thereby greatly increasing surge resistance. Moreover,
By selecting the number of parallel surge absorbing means, the required surge resistance can be set arbitrarily.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a surge absorbing device according to an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the surge withstand capacity of the surge absorbing device and the number of parallel surge absorbing means, and FIG. 3 is an embodiment of the present invention. 4 is a circuit diagram of the surge absorber manufactured in Example 2, FIG. 5 is a plan view of the same, and FIG. 6 is a cross section taken along the line vt-vt in FIG. FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6. a l + a 21 an... gap type discharge tube,
quintuple, b2. bn... Varistor, CI, (1' 2 * cn "' surge absorption means,
DESCRIPTION OF SYMBOLS 1... Lead wire, 2... Caulking, 3... Insulating case, 4... Board, 5... Insulating filler,
6...Solder, 7...Electrode.

Claims (1)

[Claims] (1) A surge absorption device comprising two or more surge absorption means each electrically connected in parallel, each consisting of a gap type discharge tube and a varistor connected in series.