阅读说明：本技术 一种基于具有防污结构的触发型过电压控制开关的可控避雷器 (Controllable lightning arrester based on trigger type overvoltage control switch with antifouling structure ) 是由 姚学玲 雷望龙 孙晋茹 陈景亮 乐杨晶 于 2021-07-22 设计创作，主要内容包括：一种具有防污结构的表面触发过电压控制开关的可控避雷器,由表面触发型过电压控制开关与氧化锌避雷器组合而成的可控避雷器。氧化锌避雷器分为固定避雷器和可控避雷器两部分,表面触发气体过电压控制开关与避雷器的可控部分并联连接。当输配电网中出现的雷电过电压或操作过电压超过一定的阈值时,具有防污结构的表面触发型气体过电压控制开关自动动作,从而将避雷器中的避雷器可控部分短路,从而达到限制整个避雷器两端过电压幅值的目的。当发生雷电过电压和操作过电压时,具有防污结构的表面触发型过电压控制开关自动动作,将避雷器的可控部分短接,使得操作过电压或冲击残压显著降低到固定部分的冲击残压值。(A controllable lightning arrester with an antifouling structure and a surface-triggered overvoltage control switch is a controllable lightning arrester formed by combining a surface-triggered overvoltage control switch and a zinc oxide lightning arrester. The zinc oxide arrester is divided into a fixed arrester and a controllable arrester, and the surface trigger gas overvoltage control switch is connected with the controllable part of the arrester in parallel. When the lightning overvoltage or the operation overvoltage in the power transmission and distribution network exceeds a certain threshold value, the surface-triggered gas overvoltage control switch with the antifouling structure automatically acts, so that the controllable part of the arrester in the arrester is short-circuited, and the purpose of limiting the overvoltage amplitude at two ends of the whole arrester is achieved. When lightning overvoltage and operation overvoltage occur, the surface trigger type overvoltage control switch with the anti-fouling structure automatically acts to short-circuit the controllable part of the lightning arrester, so that the operation overvoltage or the impact residual voltage is obviously reduced to the impact residual voltage value of the fixed part.)

1. A controllable lightning arrester with an antifouling structure and a surface-triggered gas overvoltage control switch is characterized in that: the device comprises a zinc oxide arrester and a surface trigger type overvoltage control switch with a structure for preventing impulse arc pollution, wherein the zinc oxide arrester comprises a fixed arrester and a controllable arrester which are connected in series, and the controllable arrester is connected with the surface trigger type overvoltage control switch with the structure for preventing impulse arc pollution in parallel; the upper electrode of the fixed lightning arrester is connected with the upper end of the protected power equipment, and the lower electrode of the controllable lightning arrester is connected with the lower end of the protected power equipment;

the surface trigger type overvoltage control switch with the pulse arc pollution prevention structure is a trigger type surface discharge overvoltage protection gap with an annular trigger electrode, and comprises an upper insulating shell (1), a lower insulating shell (2), an upper end flange (5) and a lower end flange (6), wherein the air pressure formed by the upper insulating shell, the lower insulating shell, the upper end flange and the lower end flange is 10⁰～10³Pa or 10⁴～5×10⁵Pa of a closed cavity or vacuum degree of 10^-1～10^-5Pa, an upper electrode (3) arranged on the upper and lower end flanges (5, 6) through an upper and a lower guide rods (11, 12)And a lower electrode (4), a discharge gap is formed between the upper electrode (3) and the lower electrode (4), an annular trigger electrode (7) is arranged between the upper insulating shell (1) and the lower insulating shell (2), the annular trigger electrode (7) is provided with a connecting terminal which extends out and is used for connecting lightning induced overvoltage or lightning energy which is coupled by an active coupling trigger circuit, an annular surface discharge insulating medium material (8) which plays a role of insulating and isolating is arranged between the annular trigger electrode (7) and the lower electrode (4), the annular trigger electrode (7) covers the upper surface of the annular surface discharge insulating medium material (8), a surface discharge trigger which forms a trigger type overvoltage protection gap among the annular trigger electrode (7), the annular surface discharge insulating medium material (8) and the lower electrode (4) forms a surface flashover discharge interface (10), the upper surface of the lower electrode (4) is lower than the upper surface of the annular surface discharge insulating dielectric material (8), a surface flashover discharge interface (10) is vertical to or forms an acute angle with the upper surface of the lower electrode (4), and a shielding cover (9) is arranged in the upper insulating shell (1) around the upper electrode (3) and the lower electrode (4);

an automatic energy coupling trigger circuit is connected between the controllable lightning arrester and the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, the automatic energy coupling trigger circuit is a two-port network circuit, the upper end and the lower end of an input port of the automatic energy coupling trigger circuit are respectively connected with the controllable lightning arrester and the upper electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, and an output port of the automatic energy coupling trigger circuit is respectively connected with the annular trigger electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution.

2. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the lower surface of the annular trigger electrode (7) is tightly contacted with the upper surface of the annular surface discharge insulating dielectric material (8), and the inner diameter of the annular trigger electrode (7) is less than or equal to that of the annular surface discharge insulating dielectric material (8).

3. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the inner diameter of the annular trigger electrode (7) is less than the inner diameter of the annular surface discharge insulating dielectric material (8) by 1.5 mm.

4. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the annular trigger electrode (7) is arranged at the joint of the upper and lower insulating shells (1, 2), and the thickness of the annular trigger electrode is 3-5 mm.

5. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the annular surface discharge insulating dielectric material (8) is made of polytetrafluoroethylene with the annular width of 5-15mm, a semiconductor or a ceramic material.

6. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the acute angle between the surface flashover discharge interface (10) and the upper surface of the main electrode (4) is 30⁰～70⁰。

7. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the shielding cover (9) is made of oxygen-free copper.

8. A controllable arrester having a surface triggered gas overvoltage control switch of the anti-fouling structure according to claim 1 characterized in that: the fixed lightning arrester and the controllable lightning arrester are formed by serially connecting a plurality of zinc oxide nonlinear resistance discs (15), the fixed lightning arrester and the controllable lightning arrester are fixedly installed in an insulating sleeve through insulating filling glue (16), upper and lower electrodes (13 and 17) of the lightning arrester, which are electrically connected with the serially connected resistance discs (15) through upper and lower flanges (18 and 19) of the lightning arrester, are arranged at the upper and lower ends of the serially connected resistance discs (15), an outer insulating umbrella skirt (14) is installed on the outer sides of the serially connected resistance discs, and the number of the resistance discs of the controllable lightning arrester is less than that of the fixed lightning arrester.

9. A controllable arrester having a surface triggered gas overvoltage control switch with a dirt repellant structure as recited in claim 8 wherein the number of zinc oxide resistive patches in the controllable arrester is 15-30% of the number of zinc oxide resistive patches in the fixed arrester.

10. A controllable arrester according to claim 1 wherein the automatic energy coupling trigger circuit comprises an energy coupling unit consisting of two coupling capacitors, one of the coupling capacitors is connected in parallel with a step-up pulse transformer, and an isolation gap is provided between the step-up pulse transformer and the parallel coupling capacitor.

Technical Field

The invention relates to a controllable lightning arrester in the fields of electric power, high-speed information railway power transmission and the like, in particular to a controllable lightning arrester based on a trigger type overvoltage control switch with an antifouling structure.

Background

Overvoltage protection is an important guarantee for the safe operation of a power system. As the voltage class of power transmission and distribution networks increases, the overvoltage level directly affects the type selection, manufacturing technology and engineering cost of power equipment, wherein the operating overvoltage is the determining factor of the insulation level of the power system. Meanwhile, the protection level of the lightning overvoltage is also a main performance evaluation index of the lightning arrester, and the lightning arrester plays a decisive role in the insulation level of the power equipment. Due to the restriction of the technical performance of the zinc oxide arrester, the level of system operation overvoltage is generally limited in the existing extra-high voltage line through the combined action of the conventional arrester and the breaker with the closing resistor, but the breaker with the closing resistor has the defects of structural load, low operation reliability, poor economical efficiency and the like. Therefore, many researchers have proposed the concept of a controllable lightning arrester based on a switch, and have obtained a wide range of engineering applications in the field of electric power.

The control gap in the composite arrester is the uncontrollable gap which is used for the earliest time, the controllable part is realized by the self-breakdown of the parallel gap, but the known defect that the lightning can not be limited or the overvoltage can not be exceeded exists due to the working dispersity of the self-breakdown gap; in the 90 s of the 20 th century, researchers in the united states put forward that a thyristor switch is introduced into a controllable lightning arrester, high-voltage tolerance is realized through the series combination of a plurality of thyristors, the controllable turn-off of the thyristors solves the technical problems of quick response and accurate control of the operation of the controllable lightning arrester, and the accurate control of the volt-ampere characteristic of the lightning arrester can be realized in principle. There are, however, two serious drawbacks: firstly, due to the limitation of thyristor voltage, a plurality of thyristors are required to be connected in series under the high-voltage condition, and the technical problem of synchronous triggering needs to be solved; secondly, because the thyristor is limited by the voltage change rate dU/dt and the current change rate dI/dt, additional voltage and current limiting measures are needed to protect the thyristor, the complexity of overvoltage protection is increased, and meanwhile, the voltage distribution of the lightning arrester is greatly influenced. With the development requirements of electric power, high-speed information railway and the like, higher requirements are put forward on a controllable lightning arrester, and the requirements mainly comprise the following steps: (1) the control gap has higher direct current/alternating current withstand voltage to ensure that the working state of the lightning arrester is not influenced under the normal condition, but has lower pulse breakdown voltage to ensure that the lightning arrester can be conducted as soon as possible under the condition of lightning or operation overvoltage, so that the controllable part of the lightning arrester is short-circuited, and the volt-ampere characteristic of the whole lightning arrester is improved. (2) The trigger control circuit for controlling the gap needs to automatically couple the energy of the lightning induction operation overvoltage, and the energy of the lightning or the operation overvoltage is not to cause the damage and the destruction of the coupled trigger circuit of the overvoltage control switch.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art and provide a controllable lightning arrester based on a trigger-type overvoltage control switch with an anti-pollution structure, which has a high ac/dc withstand voltage, a low surge breakdown voltage, and a fast overvoltage response speed, and can significantly improve the current-voltage characteristics of the whole lightning arrester and limit the levels of lightning and operating overvoltage.

In order to achieve the purpose, the invention adopts the technical scheme that:

the device comprises a zinc oxide arrester and a surface trigger type overvoltage control switch with a structure for preventing impulse arc pollution, wherein the zinc oxide arrester comprises a fixed arrester and a controllable arrester which are connected in series, and the controllable arrester is connected with the surface trigger type overvoltage control switch with the structure for preventing impulse arc pollution in parallel; the upper electrode of the fixed lightning arrester is connected with the upper end of the protected power equipment, and the lower electrode of the controllable lightning arrester is connected with the lower end of the protected power equipment;

the surface trigger type overvoltage control switch with the pulse arc pollution prevention structure is a trigger type surface discharge overvoltage protection gap with an annular trigger electrode, and comprises an upper insulating shell, a lower insulating shell, an upper end flange and a lower end flange, wherein the air pressure formed by the upper insulating shell, the lower insulating shell, the upper end flange and the lower end flange is 10⁰～10³Pa or 10⁴～5×10⁵Pa of a closed cavity or vacuum degree of 10^-1～10^-5A sealed cavity body of Pa, in which an upper guide flow and a lower guide flow are arrangedThe pole is installed on the upper electrode and the lower electrode on the upper end flange and the lower end flange, a discharge gap is formed between the upper electrode and the lower electrode, an annular trigger electrode is installed between the upper insulating shell and the lower insulating shell, the annular trigger electrode is provided with a connecting terminal which extends out and is used for connecting lightning induced overvoltage or operation overvoltage, the lightning energy is coupled by an active coupling trigger circuit, an annular surface discharge insulating medium material which plays a role of insulating and isolating is installed between the annular trigger electrode and the lower electrode, the annular trigger electrode covers the upper surface of the annular surface discharge insulating medium material, a surface discharge trigger which forms a trigger type overvoltage protection gap among the annular trigger electrode, the annular surface discharge insulating medium material and the lower electrode forms a surface flashover discharge interface, and the upper surface of the lower electrode is lower than the upper surface of the annular surface discharge insulating medium material, the surface flashover discharge interface is vertical to or forms an acute angle with the upper surface of the lower electrode, and a shielding cover is arranged in the upper insulating shell around the upper electrode and the lower electrode;

an automatic energy coupling trigger circuit is connected between the controllable lightning arrester and the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, the automatic energy coupling trigger circuit is a two-port network circuit, the upper end and the lower end of an input port of the automatic energy coupling trigger circuit are respectively connected with the controllable lightning arrester and the upper electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, and an output port of the automatic energy coupling trigger circuit is respectively connected with the annular trigger electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution.

The lower surface of the annular trigger electrode is in close contact with the upper surface of the annular surface discharge insulating dielectric material, and the inner diameter of the annular trigger electrode is smaller than or equal to that of the annular surface discharge insulating dielectric material.

The inner diameter of the annular trigger electrode is less than the inner diameter of the annular surface discharge insulating dielectric material by 1.5 mm.

The annular trigger electrode is arranged at the joint of the upper insulating shell and the lower insulating shell, and the thickness of the annular trigger electrode is 3-5 mm.

The annular surface discharge insulating medium material is made of polytetrafluoroethylene with the ring width of 5-15mm, a semiconductor or a ceramic material.

The acute angle between the surface flashover discharge interface and the upper surface of the main electrode is 30⁰～70⁰。

The shielding cover is made of oxygen-free copper.

The fixed lightning arrester and the controllable lightning arrester are formed by serially connecting a plurality of zinc oxide nonlinear resistance discs, the fixed lightning arrester and the controllable lightning arrester are fixedly installed in an insulating sleeve through insulating filling glue, upper and lower electrodes of the lightning arrester, which are electrically connected with the serially connected resistance discs through upper and lower flanges of the lightning arrester, are arranged on the upper and lower ends of the serially connected resistance discs, an outer insulating umbrella skirt is installed on the outer side of the serially connected resistance discs, and the number of the resistance discs of the controllable lightning arrester is less than that of the fixed lightning arrester.

The number of the zinc oxide resistance cards in the controllable lightning arrester is 15-30% of the number of the zinc oxide resistance cards in the fixed lightning arrester.

The automatic energy coupling trigger circuit comprises an energy coupling unit consisting of two coupling capacitors, wherein one coupling capacitor is connected with a boosting pulse transformer in parallel, and an isolation gap is arranged between the boosting pulse transformer and the coupling capacitor connected in parallel.

The surface-triggered controllable lightning arrester is formed by the surface-triggered overvoltage control switch with the antifouling structure and the zinc oxide lightning arrester. The upper electrode, the lower electrode and the annular trigger electrode of the surface trigger type overvoltage control switch are sealed in a gas or vacuum environment, the trigger mode between the annular trigger electrode and the lower electrode is triggered by an insulating medium material, and the surface discharge trigger of the trigger type overvoltage control switch has stronger initial trigger carrier release capacity, so that the pulse breakdown voltage of the overvoltage control switch can be greatly reduced while the alternating current/direct current withstand voltage is not influenced, and the trigger type gas overvoltage control switch has extremely fast overvoltage response characteristic; meanwhile, what is particularly important is that because the surface-triggered overvoltage control switch based on the gas environment has the remarkable characteristics of high direct-current breakdown voltage and low pulse breakdown voltage, the power frequency/direct-current voltage normally borne by the controllable lightning arrester can be ensured not to be influenced under the normal working condition, the alternating-current/direct-current voltage in normal operation is commonly borne by the fixed part and the controllable part of the lightning arrester, the working chargeability of the whole lightning arrester is lower, the leakage current is very small, and the performance degradation caused by the heating generated by the long-term leakage current in normal operation can be avoided; under the condition of lightning or over-voltage operation, the surface trigger type over-voltage control switch is quickly switched on, the controllable part of the lightning arrester is in short circuit connection, the volt-ampere characteristic of the whole lightning arrester is obviously improved, and the lightning over-voltage and the over-voltage operation are effectively limited.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of a surface-triggered gas overvoltage control switch having an anti-fouling structure according to the present invention.

Fig. 3 is a schematic diagram showing another structure of the surface-triggered gas overvoltage control switch having the anti-fouling structure according to the present invention.

Fig. 4 is a schematic structural view of the zinc oxide arrester unit of the present invention.

Fig. 5 is a schematic diagram of an automatic energy coupling trigger circuit of the surface-triggered gas overvoltage control switch according to the present invention.

Detailed Description

The structural and operational principles of the present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1, the present invention includes a zinc oxide arrester and a surface triggered overvoltage control switch having a structure for preventing an impulse arc pollution, the zinc oxide arrester includes a fixed arrester and a controllable arrester connected in series, the controllable arrester is connected in parallel with the surface triggered overvoltage control switch having the structure for preventing an impulse arc pollution; the upper electrode of the fixed lightning arrester is connected with the upper end of the protected power equipment, and the lower electrode of the controllable lightning arrester is connected with the lower end of the protected power equipment; an automatic energy coupling trigger circuit is connected between the controllable lightning arrester and the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, the automatic energy coupling trigger circuit is a two-port network circuit, the upper end and the lower end of an input port of the automatic energy coupling trigger circuit are respectively connected with the controllable lightning arrester and the upper electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution, and an output port of the automatic energy coupling trigger circuit is respectively connected with the annular trigger electrode and the lower electrode of the surface trigger type overvoltage control switch with the structure for preventing the pulse arc pollution.

Referring to fig. 2, the surface-triggered overvoltage control switch having a structure for preventing pollution of a pulsed arc according to the present invention is a triggered surface discharge overvoltage protection gap having a ring-shaped trigger electrode, and includes an upper insulating case 1, a lower insulating case 2, an upper end flange 5 and a lower end flange 6, which form a gas pressure 10⁰～10³Or 10⁴～5×10⁵Pa, closed chamber, or vacuum degree of 10^-1～10^-5Pa closed cavity, upper electrode 3 and lower electrode 4 mounted on upper and lower end flanges 5, 6 through upper and lower guide rods 11, 12 in the cavity, main discharge gap formed between the upper electrode 3 and the lower electrode 4, annular trigger electrode 7 with thickness of 3-5mm mounted around the lower electrode 4 at the joint of the upper insulating shell 1 and the lower insulating shell 2, annular trigger electrode 7 having a protruding connection terminal for connecting lightning overvoltage or lightning energy coupled by active coupling trigger circuit, annular surface discharge insulating dielectric material 8 made of polytetrafluoroethylene, semiconductor or ceramic material with annular width of 5-15mm mounted between the annular trigger electrode 7 and the lower electrode 4 for insulating and isolating, annular trigger electrode 7 covering the upper surface of the annular surface discharge insulating dielectric material 8, the lower surface of the annular trigger electrode 7 is closely contacted with the upper surface of the annular surface discharge insulating medium material 8, the inner diameter of the annular trigger electrode 7 is smaller than the inner diameter of the annular surface discharge insulating medium material 8 by 1.5mm, a surface flashover discharge interface 10 is formed by a surface discharge trigger forming a trigger type overvoltage protection gap among the annular trigger electrode 7, the annular surface discharge insulating medium material 8 and the lower electrode 4, the upper surface of the lower electrode 4 is lower than the upper surface of the annular surface discharge insulating medium material 8, the surface flashover discharge interface 10 is vertical to the upper surface of the main electrode 4 and is parallel to a pulse arc path between the main electrodes, and the annular trigger electrode covers the insulating medium surface, so that the annular trigger electrode is effectively prevented from being covered on the insulating medium surfaceThe metal vapor generated by the pulse-stopping arc is deposited on the surface of the insulating medium, so that the trigger type overvoltage protection gap has a high voltage protection level, and importantly, the service life of the trigger type overvoltage protection gap can be greatly prolonged. Meanwhile, a shielding cover 9 made of oxygen-free copper is arranged in the upper insulating shell 1 around the upper electrode 3 and the lower electrode 4, so that metal vapor can be prevented from diffusing and depositing on the insulating closed shells 1 and 2 to cause short circuit of the upper electrode 3 and the lower electrode 4.

Fig. 3 is another structure of the surface-triggered overvoltage control switch of the present invention having a structure for preventing pollution of a pulsed arc: the lower part of the annular surface discharge insulating dielectric material 8 is cylindrical, the inner side of the upper cylinder is trapezoidal, a surface flashover discharge interface 10 is formed between the annular surface discharge insulating dielectric material 8 and the contact points of the lower surfaces of the lower electrode 4 and the annular trigger electrode 7, and the acute angle between the surface flashover discharge interface 10 and the upper surface of the main electrode 4 is 30⁰～70⁰。

Fig. 4 is a schematic structural diagram of a zinc oxide arrester of the invention, the fixed arrester and the controllable arrester of the invention are both formed by connecting a plurality of zinc oxide nonlinear resistance sheets 15 in series, the zinc oxide nonlinear resistance sheets are fixedly installed in an insulating sleeve through insulating filling glue 16, the upper end and the lower end of the resistance sheets 15 connected in series are both provided with an upper electrode 13 and a lower electrode 17 of the arrester which are electrically connected with the resistance sheets 15 connected in series through upper flanges 18 and lower flanges 19 of the arrester, the outer side of the resistance sheets connected in series is provided with an outer insulating umbrella skirt 14, and the number of the zinc oxide resistance sheets in the controllable arrester is 15-30% of the number of the zinc oxide resistance sheets in the fixed arrester.

Referring to fig. 5, the automatic energy coupling trigger circuit of the surface-triggered gas overvoltage control switch i of the present invention includes: under the action of the lightning overvoltage or the operation overvoltage, the voltage on the coupling capacitor C2 enables the isolation gap to be conducted, pulse voltage is induced at two ends of the primary side of the pulse transformer T due to the passing of pulse current, and the primary side of the pulse transformer T is amplified by the pulse transformer T (booster transformer) to provide enough trigger voltage for the trigger overvoltage control switch, so that the conduction speed of the trigger overvoltage control switch is accelerated, the trigger overvoltage control switch has better overvoltage protection performance than a passive (without trigger electrode) two-pole discharge gap, and the ratio of the pulse breakdown voltage to the direct-current breakdown voltage of the surface trigger type gas overvoltage control switch can be regulated to be close to 1 or less than 1.

The invention is different from the prior controllable lightning arrester and has the most obvious characteristics that:

1) the trigger type overvoltage control switch based on the gas environment and capable of preventing pulse arc pollution is adopted, an automatic energy coupling trigger mechanism is arranged, and the trigger type overvoltage control switch adopts a trigger mode of surface discharge of an annular insulating medium material, so that the trigger type overvoltage control switch has the remarkable characteristics that the pulse breakdown voltage of the arrester with the trigger type overvoltage control switch can be remarkably reduced and the response time is shortened under the condition that the alternating current/direct current withstand voltage or the direct current breakdown voltage of the existing gap arrester is not reduced.

2) The surface flashover discharge interface or path of the surface trigger is vertical to (or sharp) the surface of the lower electrode, and is parallel to (or sharp) the pulse arc path between the main electrodes, so that the deposition of metal vapor generated by the pulse arc on the surface of an insulating medium is effectively avoided, and the service lives of the trigger type control switch and the control switch are greatly prolonged.

3) Due to the control action of the surface trigger type gas overvoltage control switch, the volt-ampere characteristic of the controllable arrester can be effectively improved under the condition that the alternating current/direct current withstand voltage or direct current breakdown voltage of the arrester is not reduced, and the levels of lightning overvoltage and operation overvoltage are limited. Meanwhile, the trigger type overvoltage control switch in the gas environment also has the characteristic of being not influenced by external environment factors (such as humidity, altitude and wind speed).

In conclusion, the controllable lightning arrester with the surface-triggered gas overvoltage control switch with the antifouling structure has the capabilities of high direct-current breakdown voltage and quick overvoltage response time, and can be used for protecting lightning overvoltage and operation overvoltage in electric power transmission and distribution and similar application occasions.

Surface-triggered gas overvoltage control switch and lightning arresterThe controllable parts are connected in parallel. AC or DC breakdown voltage U of surface-triggered gas overvoltage control switch_gapReference voltage U obviously higher than controllable part of lightning arrester_crefRatio of the two U_gap/U_crefThe ratio (voltage ratio) of the impact breakdown voltage to the direct current breakdown voltage of the trigger type gas overvoltage control switch with the antifouling structure is controlled within the range of 1.0-1.5, even 0.8-1.2. Under normal operating condition, the gaseous overvoltage control switch of trigger type who has antifouling structure can not lead to the fact the influence to the operating condition of the controllable part of arrester, when overvoltage and the thunder and lightning overvoltage of operation, the gaseous overvoltage control switch of trigger type who has antifouling structure switches on rapidly, the controllable part of short circuit arrester, the volt-ampere characteristic of the controllable arrester of trigger type has effectively been improved, the thunder and lightning of arrester and the voltage protection level of overvoltage of operation have effectively been promoted.