140results about How to "Low residual pressure" patented technology

A bypass passage for bypassing a check valve is connected with a vacuum introducing passage of a brake booster. The bypass passage is provided with a switching valve. Just before the start of an engine, the switching valve temporarily opens the bypass passage whereby to equalize a remaining pressure of the brake booster substantially becomes equal to an atmospheric level. As a result, the pressure in the brake booster at the starting time is set to substantially the atmospheric level so that the airflow to be sucked from the brake booster into the intake pipe at the starting time is made substantially contact every times. Thus, the fuel injection rate can be set considering the airflow to be sucked from the brake booster into the intake pipe at the starting time, even if that airflow cannot be detected.

The controllable arrester in metal oxide includes control part and fixed part connected in series. In normal operation of system, the control part and the fixed part together bear system voltage. When amplitude value of system over voltage exceeds prearranged threshold value, the fixed part bears system over voltage. Combining power electronic device in large power with arrester in metal oxide (MO), the invention puts forward concept and designing idea of controllable arrester for aiming at issue of over voltage protection for transmission system in super voltage, extra high voltage. Based on condition of maintaining invariable performance parameters of MO resistance piece, the invention reduces residual voltage of arrester effectively by using characteristics: quick response speed of power electronic device, steady operation, and flexible adjustment so as to raise protection level for arrester.

The invention provides a lightning protection device, a lightning protection combination, a lightning protection cabinet and a protection method for applying the lightning protection cabinet to a track circuit. The lightning protection device is characterized in that nonlinear elements (101) are connected to the primary or the secondary of an isolation transformer (102) in parallel, or the nonlinear elements (101) are connected to the primary and the secondary of the isolation transformer (102) in parallel respectively, two leads of a primary coil of the isolation transformer (102) are used as the two input ends of the lightning protection device, two leads of a secondary coil of the isolation transformer (102) are used as the two output ends of the lightning protection device, and an iron core and a shielding shell of the isolation transformer are used as the ground wire end of the lightning protection device. The isolation transformer is used as the main lightning protection component, the structure is simple, the lightning protection effect is good, and the defects in the prior art are overcome.

The lightning protector incldues: one common-mode lightning preventing circuit, one overcurrent protector, and one lightning preventing warning device comprising three lightning preventing warning and indicating circuits in the same structure. It features that the lightning preventing warning and indicating circuit consists of one limiting resistor and one serially connected one-way conducted lightning and indicating circuit. In the lightning preventing warning and indicating circuit, current flows in only one direction and the indicating lamp of the circuit goes out along with the blow of the overcurrent protector to indicate reliably the on-off state, and this is favorable to maintenance. The structure and configuration is simple, flexible and practical.

The invention discloses a varistor ceramic preparation method reducing ZnO grain resistivity. The preparation raw materials include zinc oxide ZnO, bismuth oxide Bi2O3, antimonous oxide Sb2O3, manganese dioxide MnO2, chromium oxide Cr2O3, cobalt oxide Co2O3, silicon dioxide SiO2 and indium nitrate crystal In(NO3)3.9H2O; and the preparation steps include a step of seed crystal roughing, a step of primary sintering, a step of seed crystal refinement, a step of raw material mixing and a step of secondary sintering. The method has the following beneficial effects: by strictly changing the control technology flow and the control technology parameters, the structural components and structural change of the material in the preparation process can be manually controlled, the grain resistivity and the residual voltage of ZnO varistor are reduced while the increase of leakage current and the decrease of nonlinear coefficient are inhibited, and thus the material has higher performance and is more suitable for industrial application.

The invention discloses a high tensile insulator with the functions of explosion-proof and lightning protection and a lightning arrester with the function of explosion-proof in the electrical equipment field. The high tensile explosion-proof lightning protection insulator comprises an explosion-proof lightning protection device body containing cell-combination in series with effective large planedischarging gap valve box, where large current can be distributed evenly and can discharge under constant pressure and the inner periphery of the cavity opening is provided with a bulb and an iron capwhich lie in a rabbet platform, a trough type hoop, a joint foot pole of the base of a hollow round platform and a tensile reinforcement combination used for preventing the dislocation caused by drawing. The explosion-proof lightning arrester of the invention comprises an explosion-proof lightning device body containing cell-combination in series with effective large plane discharging gap valve box, where large current can be distributed evenly and can discharge under constant pressure and a fixed shelving combination. The beneficial effect of the invention is that the high tensile explosion-proof lightning protection insulator and the explosion-proof lightning arrester can bear large surging, has low residual voltage and low energy loss, can resist electric sleet disaster and is safe andreliable.

The invention relates to a multi-gap metal gas discharge tube (hereinafter referred to as M-GDT) power supply over-voltage protection module, which mainly consists of the M-GDT. A terminal electrode A of the M-GDT is in conducive connection with a phase line L of a power supply, A terminal electrode A' of the M-GDT is in conductive connection of a neutral line N or a protective earth PE of the power supply, intermediate electrodes of K1-Kn of the M-GDT are respectively in conductive connection with one ends of voltage dependent resistors of MOV1-MOVn, and the other ends of the MOV1-MOVn are in conductive connection with the terminal electrode A or the terminal electrode A' of the M-GDT. The product of the invention has no potential safety hazard, large current capacity, no continuous current, high reliability and good stability.

The invention provides a DC controllable lightning arrester device. The DC controllable lightning arrester device comprises a lightning arrester body and a hybrid switch, wherein the lightning arrester body comprises a lightning arrester fixed part and a lightning arrester controllable part, the lightning arrester fixed part and the lightning arrester controllable part respectively comprise at least one column of lightning arrester units, one end of a parallel circuit formed by the lightning arrester controllable part and the hybrid switch is grounded, the other end is connected with the lightning arrester fixed part, the hybrid switch comprises a thyristor valve switch and a mechanical switch which are connected in series, and the hybrid switch is connected with two ends of the lightningarrester controllable part in parallel. The DC controllable lightning arrester device is advantaged in that the thyristor valve switch and the mechanical switch are utilized to form the high voltage DC hybrid switch type controllable lightning arrester, the thyristor switch is ensured to be reliably turned off, so the lightning arrester returns to normal operation, the lightning arrester body achieves dual functions of energy release and overvoltage suppression, a charge rate of the whole lightning arrester under the operation voltage is reduced, the safety margin of the lightning arrester isimproved, and reliability of the lightning arrester is enhanced.

Disclosed is a backup protection unit of a surge protector, which is connected to the surge protector. The backup protection unit includes: a faulty driver, a tripping mechanism, a contact switch, an operating handle and an indicator, and a faulty driver is connected in parallel with a surge bypass. Alternatively, the backup protection unit includes a fault protector and an indicator, the fault protector is connected in series with a surge blocker, and surge bypassers are connected in parallel at both ends of the series circuit formed by the series fault protector and surge blocker. The surge bypass device provided by the present invention realizes the effective separation of surge and fault current, diverts the surge energy that the fault driver should bear, and thus improves the surge impact capability.

The invention relates to a coaxial channel lightning protection device circuit, which comprises a gas discharge tube I, a transient voltage suppressor diode (also called TVS diode) II, a coupling resistor R and a fast recovery diode D; the gas discharge tube I is connected with the transient voltage suppressor diode II through the coupling resistor R. Compared with the prior art, the circuit provided by the invention has the advantages of large through-flow capacity (5KA), fast response speed (nano-second level), small volume, convenience in installation and the like; as a multi-level protection circuit is adopted, the residual voltage is low; and moreover, the circuit is suitable for overvoltage protection of related devices which transmit videos and data signals through a coaxial cable, and can protect the device from being damaged by sensing the overvoltage and operating the overvoltage.

The invention discloses a same-time-sequence multi-pulse lightning protection box. The same-time-sequence multi-pulse lightning protection box comprises a lightning protection module, a sampling circuit, a detection circuit and a display panel which are connected in sequence, wherein the sampling circuit comprises an EMC (Electro Magnetic Compatibility) strong electromagnetism restraining circuit, a signal acquisition circuit and a strong electromagnetism isolating restraining circuit. When a low-voltage power supply circuit is subjected to lightning electromagnetic pulse impact, a lightning overvoltage signal is generated on the low-voltage power supply circuit and is applied to the lightning protection module, the lightning protection module is used for transmitting one path of the lightning overvoltage signal to the EMC strong electromagnetism restraining circuit, and the other path of the lightning overvoltage signal is connected with a PE (Provider Edge) end, so that lightning is conducted into the ground; the EMC strong electromagnetism restraining circuit is used for limiting the rising gradient and amplitude of the generated lightning overvoltage signal and transmitting the processed signal to the signal acquisition circuit; the signal acquisition circuit is used for acquiring a signal and transmitting the acquired signal to the strong electromagnetism isolating restraining circuit; and the strong electromagnetism isolating restraining circuit is used for isolating the signal, transmitting the processed signal to the detection circuit, and accurately transmitting the processed signal to the display circuit panel, so that man-machine information exchange is completed.

A making method of a low-residual voltage piezoresistor of low-resistivity ZnO crystal grains is characterized in that raw materials for making the low-residual voltage piezoresistor include zinc oxide (ZnO), bismuth oxide (Bi2O3), diantimony trioxide (Sb2O3), manganese dioxide (MnO2), chromium oxide (Cr2O3), cobalt sesquioxide (Co2O3), silica (SiO2), aluminum nitrate crystals (Al(NO3)3.9H2O) and gallium nitrate (Ga(NO3)3.9H2O); and the making method comprises the steps of crude seed crystal preparation, primary sintering, seed crystal refinement, raw material and secondary sintering. The method has the following advantages: the structure components and the structure change of the above material in the preparation method can be artificially controlled through strictly changing the sintering process flow and controlling process parameters, so the resistivity of the grains is reduced, the residual voltage of the ZnO piezoresistor is reduced, and increase of the leakage current and decrease of a nonlinear coefficient are inhibited, thereby the material has high performances and is suitable for industrial applications.

The invention relates to a conversion current and over-voltage protection technology of electric equipment, in particular to a protector for preventing interception over-voltage and arc reignition over-voltage of a vacuum circuit breaker. A valve body of the protector is assembled by mutual series-parallel connection of a column-type valve plate RN1 of a ZnO non-linear resistor, a ring-type valveplate RN2of a Sic non-linear resistor, and a column-type valve plate RN3 of a ZnO non-linear resistor ; then output ends are connected to both ends of DL movable and stationary main contacts in parallel. The vacuum circuit breaker has the ability of converting current and limiting voltage when the large current is switched on and off, and the function of preventing the interception over-voltage and the arc reignition over-voltage when the low current is switched on and off. When the circuit breaker closes the switch, the current flows from both ends of the main contacts and does not flow in the protector, thus the protector can not have the aging problem, a loop can not cause the reignition over-voltage in the process of switching on and off, thereby protecting the main contact against burning or shortening the service life due to the arc reignition.

The lighting protector comprises the power input end, the consumer end and the lightning protection ground. The characters are that the reactor is connected between the power input end and the consumer end. The first stage lighting protection circuit as sealed type spark gap is connected between the power input end and the lightning protection ground. The second and the third lightning protection circuit are connected between the consumer end and the lightning protection ground. The second lightning protection circuit is a metallization thin film capacitor, and the third lightning protection circuit is zinc oxide piezoresistor. The reactor possesses the magnetic core with high magnetic inductivity. Flat copper wire is used for the connecting wire.

Disclosed is a distribution system concentrated ground protection and lightning protection device and system. The distribution system concentrated ground protection and lightning protection device comprises a power source protection unit and a ground protection unit, an external power source supplies protected devices with power through the power source protection unit, the device ground PE (protecting earthing) ends of the protected devices are connected with a concentrated ground wire through the ground protection unit for grounding, and according to the system, all RRUs (Radio Remote Units) are subjected to concentrated grounding through the concentrated ground wire by all BBUs (Building Base band Units) of more than one protected device. Due to the fact that a concentrated grounding technology is utilized in the distribution system concentrated ground protection and lightning protection device and system, grounding can be performed through alternating current null wires or direct current positive wires, and concentrated grounding can also be achieved through power cable shielded wires or by adding a protective ground wire to a power cable.

The invention provides a surge protection circuit. The surge protection circuit comprises a bidirectional voltage suppressor and a thyristor-type surge suppression unit, wherein the thyristor-type surge suppression unit is connected with the bidirectional voltage suppressor in parallel; the first end of the bidirectional voltage suppressor is connected with the first end of the thyristor-type surge suppression unit; the second end of the bidirectional voltage suppressor is connected with the second end of the thyristor-type surge suppression unit; the surge protection circuit is characterized in that the breakover voltage or breakdown voltage in the direction from the first end to the second end of the thyristor-type surge suppression unit is higher than the clamping voltage in the direction from the first end to the second end of the bidirectional voltage suppressor; the breakover voltage in the direction from the second end to the first end of the thyristor-type surge suppression unit is smaller than the clamping voltage in the direction from the second end to the first end of the bidirectional voltage suppressor. The invention further provides an electronic device with the surge protection circuit.

The invention relates to the field of power grid lightning protection, especially a composite lightning protection insulator. The insulator comprises an upper armor clamp, a lower armor clamp, and a housing. The upper armor clamp is connected with a needle wire clamp through a bolt, and the upper armor clamp, the housing and the lower armor clamp are sequentially connected in a fixed manner to form a closed cavity. The interior of the cavity is sequentially provided with a resistor piece and a resistor ring from the top to the bottom, and the interior of the resistor ring is provided with discharge electrodes. The discharge electrodes are axially disposed in the resistor ring in a paired manner. After the above scheme, the insulator improves the conductivity of a lightning protection porcelain insulator, and reduces the probability of lightning line breakage.

The invention discloses a lightning protection device comprising a piezoresistor and a gas discharge tube, the piezoresistor is provided with a first surface and a second surface opposite to the firstsurface, and a first electrode connected with the piezoresistor is welded on the first surface of the piezoresistor, and a second electrode connected with the piezoresistor is welded on the second surface of the piezoresistor, one side face of the gas discharge tube is welded on the second surface of the piezoresistor and is connected with the second electrode, and a third electrode connected with the gas discharge tube is welded on the other side face of the gas discharge tube. The invention further discloses a surge protection device comprising the lightning protection device. Due to the direct welding of the lightning protection device with the gas discharge tube through the piezoresistor, the welding pins and welding points are reduced, the circuit loop is shorter, and meanwhile, theresidual voltage of the whole lightning protection device circuit can be lower, and the corresponding time is shorter.

The invention relates to the technical field of piezoresistor discs for lightning arresters, in particular to a zinc oxide resistor disc and a preparation method and application thereof. The zinc oxide resistor disc provided by the invention is prepared from the following raw materials in percentage by mole: 85-95% of ZnO, 0.01-4.0% of Bi2O3, 0.01-4.0% of Sb2O3, 0.05-3.0% of Co2O3, 0.01-2.0% of MnO2, 0.01-3.0% of NiO, 0.01-2.0% of Fe2O3, 0.01-2.0% of A12O3, and 0.01-2.0% of Dy2O3. According to the zinc oxide resistor disc provided by the invention, a toxic substance Cr2O3 does not need to be added, various components including ZnO, Bi2O3, Sb2O3, Co2O3, MnO2, NiO, Fe2O3, Al2O3 and Dy2O3 cooperate with each other, such that the zinc oxide resistor disc has the excellent performances of highpotential gradient, high square wave through-flow capacity, low residual voltage, high square wave current and large current impact resistance, good aging resistance and the like.

The invention discloses a preparation method of a medium-voltage gradient zinc oxide piezoresistor MOV chip. The preparation method comprises the following steps: (1) preparing raw materials: zinc oxide, bismuth oxide, antimony oxide, cobalt oxide, manganese oxide, nickel oxide, aluminum nitrate and silver nitrate; (2) mixing and grinding a doping material; (3) carrying out continuous ball milling; (4) spraying, drying, and granulating; (5) forming; (6) discharging glue; (7) sintering; (8) carrying out ball-milling and cleaning on the black bare chip; (9) carrying out annealing heat treatmenton the product; (10) coating with silver to form a conductive electrode, and reducing the conductive electrode; (11) coating the side surface with an insulating glaze; (12) welding a copper conductingwire electrode; and (13) packaging, and encapsulating to obtain the product. According to the invention, the piezoresistor can improve the power frequency voltage / current tolerance time under the same voltage gradient so as to provide enough tripping action time for a thermal tripping device of a surge protection device SPD.

The invention discloses a lightning arrester with a parallel gap for 110kV transformer neutral point protection. The lightning arrester comprises a body unit, an auxiliary unit and a parallel gap, oneend of the auxiliary unit is grounded, and the other end of the auxiliary unit is connected with one end of the body unit in series, the other end of the body unit is connected with a to-be-protectedneutral point; the parallel gap is connected in parallel with the auxiliary unit; when a 110kV system is locally out of ground and has a single-phase grounding short-circuit fault or the system operates in a non-full-phase mode, the parallel gap does not discharge, the body unit and the auxiliary unit are connected in series to bear power frequency overvoltage, and the amplitude of the power frequency overvoltage is lower than that of a lightning arrester U1mAd.c. When lightning invades a power station, when the voltage borne by the auxiliary unit is higher than the parallel gap discharge voltage, the parallel gap discharges, the auxiliary unit is bypassed, and at the moment, the overall residual voltage of the lightning arrester is only the residual voltage of the body unit. The overvoltage level of the neutral point of the transformer can be effectively reduced, and insulation is protected against damage; and the safe and reliable operation of the lightning arrester can be ensured.

The invention relates to a line flashover protector comprising a discharge ring, a composite insulator, a discharge probe, an equipotential fitting, a flashover protector body and a cross arm. The upper end of the flashover protector body is vertically suspended on the cross arm. The equipotential fitting is connected with the flashover protector body. The composite insulator is arranged on the equipotential fitting. The composite insulator realizes isolation from a high voltage lead in operation of the flashover protector body, and the discharge probe and the discharge ring are arranged on the composite insulator and the gap between the discharge probe and the discharge ring is adjustable. The advantages of the line flashover protector are that isolation from the high voltage lead in operation of the flashover protector body can be realized through the composite insulator so that leakage current is ensured not to flow through the flashover protector body in normal operation and the service life of the flashover protector body can be enhanced; and the the discharge probe and the discharge ring are arranged so that the line-to-ground fault is not generated even the flashover protector body is damaged and thus normal operation of the line can be guaranteed.

The invention provides a gap control type metal oxide lightning arrester. The lightning arrester comprises unit sections which are sequentially connected in series in a vertical direction, wherein each unit section comprises an external insulation sleeve and a metal oxide resistance sheet, the metal oxide resistance sheet is arranged in the insulation sleeve, two ends of a bottom unit section of the lightning arrester are connected in parallel with a control unit, the control unit comprises a gap and a controller, the controller is connected with the gap, the controller is used for detecting voltages of two ends of the lightning arrester and simultaneously triggering the gap to be conducted according to the detected voltage values, and the bottom unit section is short-circuited when the gap is conducted. With the lightning arrester provided by the invention, the residual voltage of the lightning arrester can be reduced on the basis of maintaining a performance parameter of the metal oxide resistance sheet for an existing lightning arrester unchanged, and the protection level and the shock-resistant performance of the lightning arrester are improved.

The invention relates to a zinc oxide piezoresistor ceramic with high voltage gradient, low residual voltage and low leakage current and a preparation method thereof, and belongs to the technical field of piezoresistor material preparation. The method comprises the following preparation steps: mixing Bi2O3, Sb2O3, MnO2, Cr2O3, Co2O3 and SiO2, and adding deionized water for grinding; adding ZnO anddeionized water into the ground slurry, and grinding again; adding Al(NO3)3, In(NO3)3, Y(NO3)3 or Y2O3 into the ground ZnO slurry, and grinding again; tabletting and sintering the ground slurry The resistor ceramic prepared by the method has the characteristics of small leakage current, high gradient, low residual voltage, large current capacity and stable aging performance, and can better meet the application demand on overvoltage of transmission line arresters, GIS (Gas Insulated Switchgear) arresters and deeply-limited power systems.

The invention relates to the technical field of lighting protection devices, and discloses an isolating-type bidirectional communication signal lighting protection device. The isolating-type bidirectional communication signal lighting protection device comprises a lighting protection circuit, an active isolating circuit and a power supply circuit. The lighting protection circuit comprises a first gas discharge tube GDT1, a second gas discharge tube GDT2, high-speed rectifier tubes D3, a transient voltage suppressor TVS and a current-limiting resistor R1. All signals are connected with the isolating input end reference ground GND2 through the first gas discharge tube GDT1 and the transient voltage suppressor TVS respectively and connected with the lighting protection ground through the second gas discharge tube GDT2, the current-limiting resistor R1 is connected between the first gas discharge tube GDT1 and the transient voltage suppressor TVS in series, and the high-speed rectifier tubes D3 are connected with the first gas discharge tube GDT1 in a star-shaped mode. The active isolating circuit comprises magnetic coupling signal transceiver U1, a signal transceiver U2 and monostable triggers U3. According to the isolating-type bidirectional communication signal lighting protection device, several-ten-of-thousand-of-volt lightning induction is reduced to hundred-of-volt pulse voltage through the lighting protection circuit, the hundred-of-volt pulse voltage is then reduced to power supply voltage through the active isolating circuit, and therefore residual voltage of the product is minimized.

The invention relates to a novel surge protection device which mainly comprises a breaking switch, a tripping mechanism, an inertia device (inertia wheel), a displacement buffer elastic sheet, an electromagnet, a bimetallic strip, a lightning protection element, an upper terminal and a lower terminal. The upper terminal is connected with the breaking switch, the electromagnet, the lightning protection element and the lower terminal in series. The electromagnet can drive the tripping mechanism to move, the displacement buffer elastic sheet and the inertia device (inertia wheel) are arranged on the tripping mechanism, it is guaranteed that the device moves as long as an ejector rod of the electromagnet moves continuously, the ejector rod of the electromagnet moves fast and restores at the moment that lightning currents pass, the tripping mechanism does not move, and it is guaranteed that the breaking switch accurately switches off an SPD fault access. The temperature of the lightning protection element is transmitted to the bimetallic strip through a heat conduction paster, and when the temperature is too high, the bimetallic strip can be deformed to drive the tripping mechanism to move to switch off the circuit. The novel surge protection device has the comprehensive lightning preventing function, power frequency short-circuit currents can be switched off fast, tripping is carried out when leakage currents are too high, the lightning currents are discharged smoothly, and the novel surge protection device is convenient to mount, safe and effective.

The invention discloses a gas discharge tube with trigger electrodes. The gas discharge tube comprises two main discharge electrodes, the n trigger electrodes and n+1 ceramic tubes, wherein n is larger than or equal to one, the two main discharge electrodes are arranged at the two ends of the gas discharge tube, the n trigger electrodes are sequentially arranged between the two main discharge electrodes, every two adjacent electrodes are connected through the corresponding ceramic tube, and the ceramic tubes are filled with inert gas. By means of the gas discharge tube, the problems of the long response delay and the large follow current of an existing gas discharge tube are solved, and the lightning protection effect is improved.

The invention relates to the field of an electric system high voltage technique and an equipment manufacturing technique, in particular to an outdoor compound insulation high-voltage anti-thunder support. The outdoor compound insulation high-voltage anti-thunder support comprises an insulation pipe, an upper metal flange is arranged at the upper end of the insulation pipe, a lower metal flange isarranged at the lower end of the insulation pipe, the insulation pipe is filled with a metal oxide valve block set, a silicone rubber sheath sleeves the insulation pipe, and umbrella skits are arranged on the silicone rubber sheath. By means of the outdoor compound insulation high-voltage anti-thunder support, the insulating and supporting performance of a conventional high-voltage insulation support is integrally combined with the anti-thunder performance of a metal oxide lightning arrester, the insulating level is increased, the anti-thunder effect is also good, the outdoor compound insulation high-voltage anti-thunder support can be installed at an outdoor transformer substation bus or incoming line, the site space can be saved, compact arrangement of electrical equipment is facilitated, the electrical installation distance between the support and protected equipment can be shortened, the anti-thunder level of a transformer substation is effectively increased, the power supply reliability is improved, and a series of economic loss when the equipment is damaged due to insulation breakdown is reduced.

The invention relates to the technical field of electronic safety protection devices, and particularly discloses a safe disconnecting device for MOV module temperature alloy. An MOV module comprises an MOV chip, a disconnecting cavity, a temperature alloy plate, a cutter, a spring and an MOV module lead-out electrode. According to the provided safe disconnecting device for the MOV module temperature alloy, a process of connection of an MOV chip lead-out pin, a temperature welding point (low-temperature alloy) and a pressure-sensitive module lead-out pin in the prior art is changed into connection of the temperature alloy plate and the MOV module lead-out electrode, temperature transmission loss is reduced, and disconnecting reliability is improved; the temperature alloy plate can be directly connected with the MOV chip, heated area is increased, direct heating is implemented, temperature transmission loss is reduced, and disconnecting reliability and accuracy are improved; and the flattemperature alloy plate facilitates impulse current pass (skin effect) and residual voltage reduction, so that the device has a temperature protection function and a pulse current overload protectionfunction.

The invention is applicable to the technical field of surge protectors, and provides a high-voltage lightning-proof surge suppression circuit, a device and a power adapter, comprising a varistor, a discharge tube, a high-voltage capacitor, an inductance and a resistor. One end of the varistor is connected with a fire wire or a neutral wire, and the other end is grounded through the discharge tube.The high-voltage capacitor is connected in parallel at both ends of the varistor, and the inductance and the resistor are connected in series in parallel at both ends of the discharge tube. The invention can be used under the condition of withstanding voltage requirement of 1500VAC, and can discharge discharge surge current when surge peak voltage is 1600V, and residual voltage is lower than 1.3KV; It can also be used under the condition of withstand voltage requirement of 3000VAC, and discharge surge current can be discharged when surge peak voltage is 3600V, and residual voltage is lower than 3KV. It can also be used under the condition of withstand voltage requirement of 3000VAC. Under the condition of withstand voltage requirement of 1500VAC or 3000VAC, the current is lower than 5mAand no flashover occurs; And meets the basic insulation requirements, and the equivalent resistance is greater than 10M ohm under the condition of 500VAC.