JPS62272489A - Construction of gas filled discharge tube type arrestor for telecommunication - 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] 3. Detailed Description of the Invention [Industrial Application Field] The present invention is applicable to a system in which abnormal interference waves that damage communication equipment are generated in N-signal lines such as telephone lines due to lightning or the like. The present invention relates to the structure of a gas-filled discharge tube type lightning arrester for communication, which is used to protect communication equipment by removing interference waves.

[Prior Art] In general, a gas discharge tube type lightning arrester increases the distance between the discharge electrodes in relation to the discharge starting voltage value, and the material and shape of the electrode discharge surface and the distance between the discharge electrodes are adjusted so that the discharge can be performed at a predetermined discharge starting voltage. The type and pressure of the gas involved must be carefully considered.

Furthermore, semiconductor elements such as varistors have the advantage of extremely small delay, and are therefore widely used in some areas.

[Points to be solved by the invention] According to the gas-filled discharge tube type lightning arrester, even if the voltage at the set value is ignited in order to transition from glow discharge to arc discharge, the set value remains the same. There was a drawback that a voltage higher than that remained. Residual voltage that exceeds the set value that occurs in this small moment is more likely to damage high-performance communication equipment that uses many high-density semiconductor elements than general communication equipment, so it is extremely difficult to shorten the time it takes for discharge to start. It had become an important issue.

Furthermore, when the flowing current of a semiconductor type element such as a varistor is large, the operating voltage corresponding to the discharge starting voltage is exceeded, and the shape becomes large compared to the withstand capacity. It requires a larger volume than a gas discharge tube type arrester, which uses the energy of the generated arc discharge voltage times the current. As a result, the electrostatic capacitance between the electrodes inevitably increases significantly, which has a negative effect on high-frequency characteristics, and as a result, people have begun to reconsider gas discharge tube type lightning arresters.

In order to operate the conventional gas discharge tube type lightning arrester at high operation speed, a resistance wire is drawn on the inner wall of the insulating tube that seals between the electrodes, keeping insulation from the electrodes, and a voltage is applied. Attempts have been made to activate the discharge between the electrodes by creating a creeping discharge in a part of the wire. However, even with this method, a voltage equal to the sum of the creeping discharge voltage and the voltage generated at the edge of the resistance remains until the main discharge occurs.

Therefore, the present invention was invented in view of the above-mentioned circumstances, and its object is to further reduce the residual voltage generated until the main discharge by the gas discharge tube type lightning arrester. It is something to do.

[Structure of the Invention] In order to achieve the above object, the structure of the gas-filled discharge tube type lightning arrester for communications according to the present invention is such that a creeping discharge part and an air discharge part are provided in the same discharge space. It is characterized in that the air discharge portion and the air discharge portion are connected by a resistor, the creeping discharge portion is grounded to the equipment side, and the air discharge portion is grounded to the outside wire side common electrode.

[Operation of the Invention] When a lightning surge is applied to the line electrode, a predetermined voltage is generated at the device side electrode via the resistance. A creeping discharge is started between the equipment side electrode and the ground electrode due to the above voltage, and under the influence of such discharge, a main discharge is started in the air discharge portion. Due to the main discharge, the voltage during discharge between the outer line side electrode and the ground electrode decreases, so the creeping discharge stops.

[Embodiments of the Invention] Fig. 1 is a structural diagram of a communication gas large discharge tube type A lightning device according to the present invention, where l is a line side electrode, 2 is an equipment side electrode, 3 is a ground side electrode, and 4 is an insulating side electrode. The tube, 5 is an insulating base, 6 is silver solder, and 7 is an inert gas, and the air discharge surface of the electrode is coated with an emitter agent for promoting discharge. Both the insulating tube 4 and the insulating base 5 are made of ceramic insulators, and the opening end faces of each are metallized.

These parts are stacked in the order of outer wire side electrode 1 pass silver solder 6 → insulating tube 4 → silver solder 6 → device side electrode 2 → silver solder 6 → insulating base 5 → silver solder 6 → ground electrode 3, heated and Gas 7 is sealed in.

In this way, the gap between the outside wire side electrode 1 and the ground side electrode 3 is the air discharge part 7a, and the equipment side electrode 2 and the ground side electrode 3 are both arranged in the same space with the creeping discharge part 5a, and the creeping discharge electrons are arranged in the same space. and ions can easily stimulate the air discharge area.

Fig. 2 shows an equivalent circuit diagram, and the resistor 8 is either connected externally or treated with the surface or inner surface of the insulating tube 4 to provide resistance.For example, as shown in Fig. 1, The resistor 8 is thin <'f: forming acid can be formed.

If the voltage applied between the outside line side electrode 1 and the ground side electrode 3 does not flow as a current, the Ia side electrode 2 and the ground side t[
The same value is applied between poles 3 as well. Naturally, creeping discharge is much more likely to occur on the surface of the insulator than gas space discharge, and the device-side electrode 2 and the ground-side electrode 3 are in this area.

Since the current flowing here is suppressed by the resistor 8, the voltage between the outside line side electrode l and the ground side electrode 3 is higher than the voltage between the device side electrode 2 and the ground side electrode 3.

When the outside wire side electrode 1 and the ground side electrode 3 discharge under the influence of creeping discharge, if the energy is sufficient, 7-
The creeping discharge stops because the discharge occurs and the voltage during the discharge between the outside line side electrode 1 and the ground side electrode 3 becomes several lOv or less.

Figure 3 shows the voltages at various parts when a lightning surge is applied, where 9 is the applied waveform, 10 is the waveform between the outside wire side electrode 1 and the ground side electrode 3, and 11 is the equipment side 'itt pole 2. and the ground electrode 3, 12 is a waveform of a general discharge type a, and 13 is a waveform of a constant voltage element such as a varistor.

Even if the discharge starting voltage, that is, the operating voltage is To, in the case of a waveform with a steep rise such as a lightning surge, a general discharge type arrester will momentarily pass a high voltage due to the discharge delay.

Further, although a constant voltage element such as a varistor operates near the operating voltage, when the current increases, as explained above, it does not have a reduction effect even after the elapse of time.

[Effects of the Invention] The communication gas discharge tube type lightning arrester 3 of the present invention has the following features.

■Equipment is protected by creeping discharge with extremely low discharge delay.

■External line side electrode 1 and ground side electrode 3 with high-speed creeping discharge
can be triggered.

■Even if the inter-electrode discharge occurs quickly, the discharge time of the creeping discharge is short, and the insulation of the creeping discharge part is less deteriorated, improving the life.

[Brief explanation of drawings]

Fig. 1 is a structural diagram of a gas-filled discharge tube type lightning arrester for communications according to the present invention, Fig. 2 is an equivalent circuit diagram of the structure in Fig. 1, and Fig. 3 explains the residual voltage characteristics of each interpolar discharge element. This is a diagram for 10. Line side electrode, 210 equipment side electrode, 3. . Ground side electrode, 4. , insulation tube, 50. Insulated base, 5a6.
Creeping discharge portion, 7a4. Air discharge part. 81. resistance.

Claims (1)

[Claims] In a gas-filled discharge tube type lightning arrester for telecommunications, which is constructed by sealing gas inside an insulating envelope through an electrode, a creeping discharge part and an air discharge part are provided in the same discharge space, and the creeping discharge part and the air discharge part are provided in the same discharge space. A structure of a gas-filled discharge tube type lightning arrester for communications, characterized in that the intermediate discharge part is connected to the terminal by a resistor, the creeping discharge part is grounded to the equipment side electrode, and the air discharge part is grounded to the outside wire side electrode.