CN210404733U - Alternating current power supply lightning protection device with overcurrent and overvoltage protection functions - Google Patents
Alternating current power supply lightning protection device with overcurrent and overvoltage protection functions Download PDFInfo
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- CN210404733U CN210404733U CN201921598987.6U CN201921598987U CN210404733U CN 210404733 U CN210404733 U CN 210404733U CN 201921598987 U CN201921598987 U CN 201921598987U CN 210404733 U CN210404733 U CN 210404733U
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Abstract
The utility model discloses an AC power supply lightning protection device with overcurrent and overvoltage protection functions, one end of a first piezoresistor is connected with one end of a first temperature control protective tube and one end of a first transient overvoltage protective tube, the other end of the first temperature control protective tube is connected with an AC power supply phase line, and the other ends of the first transient overvoltage protective tube and the first piezoresistor are connected with a power supply zero line and one end of a second temperature control protective tube; the other end of the second temperature control protective tube is connected with one end of a second piezoresistor and one end of a second transient overvoltage protective tube, and the other ends of the second transient overvoltage protective tube and the second piezoresistor are grounded; one end of the third temperature control fuse is connected with an alternating current power supply phase line, the other end of the third temperature control fuse is connected with one end of a third piezoresistor and one end of a third transient overvoltage protection tube, and the other ends of the third piezoresistor and the third transient overvoltage protection tube are grounded. The lightning protector has overcurrent and overvoltage double protection functions, prolongs the service life of the device and ensures the safety of a system.
Description
Technical Field
The application relates to the technical field of lightning protection devices, in particular to an alternating current power supply lightning protection device with overcurrent and overvoltage protection functions.
Background
Lightning is a special weather phenomenon caused by the discharge of charged clouds in the air. The path of damaging people and buildings by lightning comprises direct lightning stroke and lightning electromagnetic pulse, wherein the direct lightning stroke is expressed as strong lightning current and is protected by a lightning receptor, a down conductor, a grounding device and the like; the lightning electromagnetic pulse is represented by radiation of a magnetic field, inductive surge on a circuit and the like, and can be protected by measures such as shielding, reasonable wiring, installation of a surge protector and the like. Thus, the destructive lightning is one of the important reasons for damaging the electronic equipment, and threatens the safe and stable operation of electronic information systems in various fields such as buildings, railways, civil aviation, communication, industrial control, military and the like.
The lightning protector is an electric device with non-linear element and can protect not only the overvoltage and overcurrent caused by electromagnetic pulse of thunder and lightning, but also the surge generated by line voltage fluctuation and misoperation. When spike current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the lightning protection device can be conducted and shunted within a very short time, so that damage to other equipment in the loop caused by surge is avoided.
The lightning protection device of the alternating current power supply generally adopts a load symmetrical circuit, has full protection of common mode and differential mode, can be installed at the input or output end of a three-phase four-wire alternating current power supply and a one-way two-wire power supply, and is suitable for a distribution room, a distribution cabinet, a switch cabinet, an alternating current distribution control system and other various important equipment or equipment which is easy to be struck by lightning so as to protect an equipment power supply system from being damaged by lightning overvoltage.
The working principle of the existing lightning protection device for the alternating current power supply is that the nonlinear characteristic of a piezoresistor is utilized, and the piezoresistor usually adopts a zinc oxide valve plate sealed in a porcelain bushing. When the voltage does not fluctuate, the voltage dependent resistor is in a high-resistance state, and when the voltage fluctuates and reaches the starting voltage of the voltage dependent resistor, the voltage dependent resistor is in a low-resistance state quickly, so that the voltage is limited within a certain range.
However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the conventional lightning protection device for an ac power supply at least has the following technical problems:
1. the lightning protection device of the alternating current power supply has no over-current and over-voltage protection function, is easy to damage under over-current and/or instant high-voltage impact, and has short service life;
2. the flow of the piezoresistor is not ideal, the maximum discharge current of the general piezoresistor is 20KA (8/20uS), and the use requirement of a B-level occasion cannot be met;
3. the residual voltage of the voltage dependent resistor is too high and sometimes exceeds the working voltage of the protected system by more than several times, even reaches more than 2KV, although the time for attaching and acting on the protected equipment is only a few microseconds and is not enough to immediately damage the protected equipment, the frequent action inevitably causes the early progressive damage of the protected equipment, thereby affecting the normal operation of the system.
With the rapid development of large-scale integrated circuit technology, the degree of electronic integration of electronic and electrical systems is higher and higher, and a large number of high-precision and high-sensitivity electronic components are widely applied, so that higher requirements on an alternating current power supply lightning protection device are required for more effectively inhibiting damages caused by lightning and various surges.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved is how to protect AC power supply lightning protection device's overcurrent and overvoltage, improves AC power supply lightning protection device's logical flow, reduces AC power supply lightning protection device's residual voltage simultaneously, and then improves AC power supply lightning protection device's life.
In order to solve the above technical problem, an embodiment of the present application provides an ac power supply lightning protection device with overcurrent and overvoltage protection functions, where the ac power supply lightning protection device with overcurrent and overvoltage protection functions includes a first voltage dependent resistor, a second voltage dependent resistor, and a third voltage dependent resistor, one end of the first voltage dependent resistor is connected to one end of a first temperature control fuse and one end of a first transient overvoltage protection tube, the other end of the first temperature control fuse is connected to an ac power phase line, and the other end of the first transient overvoltage protection tube and the other end of the first voltage dependent resistor are both connected to a power supply zero line and one end of a second temperature control fuse; the other end of the second temperature control fuse is connected with one end of the second piezoresistor and one end of a second transient overvoltage protection tube, and the other end of the second transient overvoltage protection tube and the other end of the second piezoresistor are both grounded; and one end of the third temperature control fuse tube is connected with an alternating current power supply phase line, the other end of the third temperature control fuse tube is connected with one end of a third voltage dependent resistor and one end of a third transient overvoltage protection tube, and the other end of the third voltage dependent resistor and the other end of the third transient overvoltage protection tube are both grounded.
Preferably, a gas discharge tube is connected between the other end of the second overvoltage transient protection tube, the other end of the second varistor, the other end of the third overvoltage transient protection tube, and the other end of the third varistor and the ground.
Preferably, the first temperature control protective pipe, the second temperature control protective pipe and the third temperature control protective pipe respectively comprise fusible alloy modules, fluxing resin is wrapped around the fusible alloy modules, the fusible alloy modules are connected with metal guide sheets, the exterior of the fusible alloy modules wrapped with the fluxing resin is sealed through a plastic shell, and the metal guide sheets are partially exposed out of the plastic shell.
Preferably, the first transient overvoltage protection tube, the second transient overvoltage protection tube and the third transient overvoltage protection tube are transient voltage suppression diodes.
Preferably, the first piezoresistor and the second piezoresistor and the third piezoresistor have the same specification.
More preferably, a rated reverse turn-off voltage of the first transient overvoltage protection tube is greater than or equal to a maximum working voltage of the first piezoresistor, and a maximum clamping voltage of the first transient overvoltage protection tube is smaller than a breakdown voltage of the first piezoresistor.
More preferably, a rated reverse turn-off voltage of the second overvoltage transient protection tube is greater than or equal to a maximum working voltage of the second varistor, and a maximum clamping voltage of the second overvoltage transient protection tube is smaller than a breakdown voltage of the second varistor.
More preferably, a rated reverse turn-off voltage of the third overvoltage transient protection tube is greater than or equal to a maximum working voltage of the third varistor, and a maximum clamping voltage of the third overvoltage transient protection tube is smaller than a breakdown voltage of the third varistor.
Preferably, a ceramic sealed housing is provided outside the gas discharge tube.
Further, the diameter of the gas discharge tube is not less than 8 mm.
The application provides an alternating current power supply lightning protection device with overcurrent and overvoltage protection function, with the temperature control protective tube establish ties in the circuit, the too big temperature that leads to fusible alloy in the electric current in the circuit risees to the level of setting for, fusible alloy will fuse fast to cut off piezo-resistor's outer loop, prevent that piezo-resistor from being burnt.
The alternating current power supply lightning protector with the over-current and over-voltage protection function is characterized in that the piezoresistor is connected with the transient over-voltage protection tube in parallel, when two ends of the transient over-voltage protection tube are subjected to transient high-energy impact, the piezoresistor can reduce the impedance of the transient over-voltage protection tube suddenly at a very high speed, and simultaneously absorb a large current to clamp the voltage between the two ends of the transient over-voltage protection tube on a preset value, so that the piezoresistor is prevented from being damaged by the transient high-energy impact.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
1. through setting up temperature control protective tube and transient state overvoltage protection tube, realized the overcurrent of device and overvoltage duplicate protection function, prolonged alternating current power supply lightning protection device's life, ensured the safety of system.
2. Three piezoresistors are connected in parallel, so that the flow rate of the piezoresistors is greatly improved, the use requirement of a B-level occasion is met, and the problem of the flow rate of the piezoresistors is fundamentally solved.
3. The residual voltage given by the three piezoresistors in parallel connection is far less than that of a traditional alternating-current power supply lightning protection device, the protected equipment can be effectively prevented from being damaged, and the lightning protection device is suitable for lightning protection of large-scale, high-precision and high-sensitivity electronic components.
4. The gas discharge tube is used as a discharge channel, the gas discharge tube utilizes gas discharge to play a role of discharging current once through breakdown gas, leakage current of the piezoresistor can be effectively blocked, the phenomena of aging, spontaneous combustion and the like caused by leakage current of the traditional alternating current power supply lightning protection device are avoided, and the service life of the alternating current power supply lightning protection device is greatly prolonged.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Fig. 1 is a schematic structural diagram of an ac power supply lightning protection device with overcurrent and overvoltage protection functions according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an ac power supply lightning arrester with overcurrent and overvoltage protection functions according to embodiment 2 of the present invention;
description of reference numerals:
the overvoltage protection device comprises a first piezoresistor RV1, a second piezoresistor RV2, a third piezoresistor RV3, a first temperature control fuse TF1, a second temperature control fuse TF2, a third temperature control fuse TF3, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, a third transient overvoltage protection tube TVS3 and a gas discharge tube G.
Detailed Description
The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Example 1
Fig. 1 is a schematic structural diagram of an ac power lightning arrester with overcurrent and overvoltage protection functions provided in this embodiment, where the ac power lightning arrester with overcurrent and overvoltage protection functions includes a first varistor RV1, a second varistor RV2, a third varistor RV3, a first temperature control fuse TF1, a second temperature control fuse TF2, a third temperature control fuse TF3, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, and a third transient overvoltage protection tube TVS 3.
One end of a first voltage dependent resistor RV1 is connected with one end of a first temperature control fuse TF1 and one end of a first transient overvoltage protection tube TVS1, the other end of the first temperature control fuse TF1 is connected with an alternating current power supply phase line L, and the other end of the first transient overvoltage protection tube TVS1 and the other end of the first voltage dependent resistor RV1 are connected with a power supply zero line N and one end of a second temperature control fuse TF 2; the other end of the second temperature control fuse TF2 is connected with one end of a second piezoresistor RV2 and one end of a second transient overvoltage protection tube TVS2, and the other end of the second transient overvoltage protection tube TVS2 and the other end of the second piezoresistor RV2 are both grounded PE; the alternating current power supply phase line L is further connected with one end of a third temperature control fuse TF3, the other end of the third temperature control fuse TF3 is connected with one end of a third voltage dependent resistor RV3 and one end of a third transient overvoltage protection tube TVS3, and the other end of the third voltage dependent resistor RV3 and the other end of the third transient overvoltage protection tube TVS3 are both grounded PE.
The direct-current power supply lightning protection device with the over-current and over-voltage protection function provided by the embodiment adopts the three piezoresistors to be connected in parallel, so that the flow rate of the piezoresistors is greatly improved, the use requirement of a B-level occasion is met, and the problem of the flow rate of the piezoresistors is fundamentally solved.
Meanwhile, experimental research shows that the residual voltage given by the parallel connection of the three piezoresistors is far less than that of a single piezoresistor. The residual voltage of the alternating current power supply lightning protection device with the overcurrent and overvoltage protection function can be reduced to be less than 2 times of the maximum working voltage of a protected system, protected equipment can be effectively prevented from being damaged, and the alternating current power supply lightning protection device is suitable for lightning protection of large-scale, high-precision and high-sensitivity electronic components.
In this embodiment, three piezoresistors are respectively connected in series with a temperature control fuse. The temperature control protective tube adopts fusible alloy, fluxing resin is wrapped around the fusible alloy, and the fusible alloy is connected with the metal guide sheet and sealed by plastic materials. The temperature control protective tube is connected in series in the circuit, when the temperature of the fusible alloy is increased to a set level due to overlarge current in the circuit, the fusible alloy can be quickly fused, so that an external loop of the piezoresistor is cut off, and the piezoresistor is prevented from being burnt.
In this embodiment, the three piezoresistors are also connected in parallel with one transient overvoltage protection tube respectively. The transient overvoltage protection tube adopts transient VOLTAGE suppression diode TVS (transient VOLTAGE suppressor), when two ends of the TVS tube are subjected to transient high-energy impact, the transient overvoltage protection tube can enable the impedance of the TVS tube to be suddenly reduced at an extremely high speed, and simultaneously absorb a large current to clamp the VOLTAGE between the two ends of the TVS tube to a preset value, thereby ensuring that the piezoresistor is prevented from being damaged by the transient high-energy impact.
The alternating current power supply lightning protection device with the over-current and over-voltage protection function provided by the embodiment can perform the over-current and over-voltage dual protection function through the arrangement of the temperature control fuse tube and the transient over-voltage protection tube, so that the service life of the lightning protection device is prolonged, and the safety of a system is ensured.
In this embodiment, the first varistor RV1, the second varistor RV2, and the third varistor RV2 have the same voltage value.
Preferably, the voltage values of the first piezoresistor RV1, the second piezoresistor RV2 and the third piezoresistor RV2 are selected according to the following table:
in this embodiment, the specification of the temperature control fuse is selected according to the actual working condition, and it is noted that the temperature control fuse has good thermal coupling characteristics with the corresponding piezoresistor, so that the piezoresistor can be better protected, and the service life of the piezoresistor is prolonged.
In this embodiment, the specification of the transient overvoltage protection tube should be selected according to the actual working condition, and the maximum dc or continuous working voltage of the varistor of the protected circuit, the rated standard voltage of the circuit, and the "high-end" tolerance are determined during selection: the rated reverse turn-off voltage VWM of the transient overvoltage protection tube is larger than or equal to the maximum working voltage of the protected circuit. The maximum clamping voltage VC of the transient overvoltage protection tube is less than the damage voltage of the protected circuit. After the maximum clamping voltage is determined, the peak pulse current of the transient overvoltage protection tube is larger than the transient surge current.
Example 2
Fig. 2 is a schematic structural diagram of an ac power lightning arrester with overcurrent and overvoltage protection functions provided in this embodiment, where the ac power lightning arrester with overcurrent and overvoltage protection functions includes a first varistor RV1, a second varistor RV2, a third varistor RV3, a first temperature control fuse TF1, a second temperature control fuse TF2, a third temperature control fuse TF3, a first transient overvoltage protection tube TVS1, a second transient overvoltage protection tube TVS2, a third transient overvoltage protection tube TVS3, and a gas discharge tube G.
One end of a first voltage dependent resistor RV1 is connected with one end of a first temperature control fuse TF1 and one end of a first transient overvoltage protection tube TVS1, the other end of the first temperature control fuse TF1 is connected with an alternating current power supply phase line L, and the other end of the first transient overvoltage protection tube TVS1 and the other end of the first voltage dependent resistor RV1 are connected with a power supply zero line N and one end of a second temperature control fuse TF 2; one end of a second piezoresistor RV2 and one end of a second transient overvoltage protection tube TVS2 are arranged at the other end of the second temperature control fuse TF2, and the other end of the second transient overvoltage protection tube TVS2 and the other end of the second piezoresistor RV2 are both connected with one end of a gas discharge tube G; the alternating current power supply phase line L is further connected with one end of a third temperature control fuse TF3, the other end of the third temperature control fuse TF3 is connected with one end of a third voltage dependent resistor RV3 and one end of a third transient overvoltage protection tube TVS3, the other end of the third voltage dependent resistor RV3 and the other end of the third transient overvoltage protection tube TVS3 are both connected with one end of a gas discharge tube G, and the other end of the third voltage dependent resistor RV3 is connected with the grounding PE of the gas discharge tube G.
In the ac power supply lightning protection device with overcurrent and overvoltage protection function provided in this embodiment, a gas discharge tube G is added on the basis of embodiment 1. Meanwhile, a gas discharge tube G is used as a discharge channel, and the gas discharge tube G discharges gas to play a role in discharging current at one time by breaking down the gas. The gas discharge tube G is added, so that the leakage current of the piezoresistor can be effectively blocked, the phenomena of aging, spontaneous combustion and the like of the single piezoresistor (zinc oxide valve plate) caused by leakage current are avoided, and the service life of the piezoresistor is greatly prolonged.
In this embodiment, the gas discharge tube G is hermetically sealed and sealed with ceramic, and the diameter of the gas discharge tube G is 8mm or more.
It should be understood that although the quantitative terms "first", "second", etc. may be used to describe various elements in the above embodiments, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the method of the present invention, and such modifications and additions are also considered to be within the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (10)
1. An alternating current power supply lightning protection device with overcurrent and overvoltage protection functions is characterized in that: the overvoltage protection circuit comprises a first voltage dependent resistor (RV1), a second voltage dependent resistor (RV2) and a third voltage dependent resistor (RV3), wherein one end of the first voltage dependent resistor (RV1) is connected with one end of a first temperature control fuse (TF1) and one end of a first transient overvoltage protection tube (TVS1), the other end of the first temperature control fuse (TF1) is connected with an alternating current power supply phase line (L), and the other end of the first transient overvoltage protection tube (TVS1) and the other end of the first voltage dependent resistor (RV1) are both connected with a power supply zero line (N) and one end of a second temperature control fuse (TF 2); the other end of the second temperature control fuse (TF2) is connected with one end of the second piezoresistor (RV2) and one end of a second transient overvoltage protection tube (TVS2), and the other end of the second transient overvoltage protection tube (TVS2) and the other end of the second piezoresistor (RV2) are grounded; alternating current power supply phase line (L) is connected to third temperature control fuse (TF3) one end, third varistor (RV3) one end and third transient overvoltage protection tube (TVS3) one end are connected to third temperature control fuse (TF3) other end, third varistor (RV3) other end with third transient overvoltage protection tube (TVS3) other end all grounds.
2. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 1 wherein: and a gas discharge tube (G) is connected between the other end of the second transient overvoltage protection tube (TVS2), the other end of the second piezoresistor (RV2), the other end of the third transient overvoltage protection tube (TVS3) and the other end of the third piezoresistor (RV3) and the ground.
3. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 1 wherein: the first temperature control protective tube (TF1), the second temperature control protective tube (TF2) and the third temperature control protective tube (TF3) comprise fusible alloy modules, fluxing resin is wrapped around the fusible alloy modules, the fusible alloy modules are connected with metal guide pieces, the fusible alloy modules wrapped with the fluxing resin are sealed through plastic shells, and the metal guide pieces are partially exposed outside the plastic shells.
4. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 1 wherein: the first transient overvoltage protection tube (TVS1), the second transient overvoltage protection tube (TVS2) and the third transient overvoltage protection tube (TVS3) are transient voltage suppression diodes.
5. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 1 wherein: the first piezoresistor (RV1), the second piezoresistor (RV2) and the third piezoresistor (RV3) are equal in specification.
6. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 4 wherein: the rated reverse turn-off voltage of the first transient overvoltage protection tube (TVS1) is greater than or equal to the maximum working voltage of the first piezoresistor (RV1), and the maximum clamping voltage of the first transient overvoltage protection tube (TVS1) is less than the damage voltage of the first piezoresistor (RV 1).
7. An ac power lightning protector with overcurrent and overvoltage protection function according to claim 4 characterized in that the rated reverse turn-off voltage of the second overvoltage transient protection tube (TVS2) is greater than or equal to the maximum working voltage of the second varistor (RV2), and the maximum clamping voltage of the second overvoltage transient protection tube (TVS2) is less than the breakdown voltage of the second varistor (RV 2).
8. An ac power lightning protector with overcurrent and overvoltage protection function according to claim 4 characterized in that the rated reverse turn-off voltage of the third overvoltage transient protection tube (TVS3) is greater than or equal to the maximum working voltage of the third varistor (RV3), and the maximum clamping voltage of the third overvoltage transient protection tube (TVS3) is less than the breakdown voltage of the third varistor (RV 3).
9. An ac power lightning protector with overcurrent and overvoltage protection as set forth in claim 2 wherein: and a ceramic sealing shell is arranged outside the gas discharge tube (G).
10. An alternating current power supply lightning protector with overcurrent and overvoltage protection as set forth in claim 2 or 9, wherein: the diameter of the gas discharge tube (G) is not less than 8 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921598987.6U CN210404733U (en) | 2019-09-25 | 2019-09-25 | Alternating current power supply lightning protection device with overcurrent and overvoltage protection functions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921598987.6U CN210404733U (en) | 2019-09-25 | 2019-09-25 | Alternating current power supply lightning protection device with overcurrent and overvoltage protection functions |
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| CN210404733U true CN210404733U (en) | 2020-04-24 |
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| CN201921598987.6U Active CN210404733U (en) | 2019-09-25 | 2019-09-25 | Alternating current power supply lightning protection device with overcurrent and overvoltage protection functions |
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