CN112180225A - Triple lightning stroke anti-false triggering protection circuit - Google Patents
Triple lightning stroke anti-false triggering protection circuit Download PDFInfo
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- CN112180225A CN112180225A CN202011178298.7A CN202011178298A CN112180225A CN 112180225 A CN112180225 A CN 112180225A CN 202011178298 A CN202011178298 A CN 202011178298A CN 112180225 A CN112180225 A CN 112180225A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1236—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of surge arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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Abstract
The application provides a triple lightning stroke anti-false triggering protection circuit which comprises a first impact current device, a second impact current device, a third impact current device, a grounding loop, a triggering unit and a test article; the protection circuit is connected in series on the connecting line of the first impulse current device, the second impulse current device and the third impulse current device, the first impulse current device, the second impulse current device, the third impulse current device and the grounding circuit are connected in a specific wiring mode of each grounding connecting line, the purpose that each impulse current device sequentially generates triple impulse currents for a test article is achieved, each impulse current device is not mutually influenced, and the problem of false triggering in the traditional parallel test of a plurality of impulse current devices is effectively prevented. The device that provides in this application design is simple, convenient operation, stable performance, has certain suitability.
Description
Technical Field
The application relates to the technical field of high-voltage test device protection, in particular to a triple lightning stroke anti-false triggering protection circuit.
Background
Lightning is a frequent natural disaster. It not only seriously threatens the life safety of people, but also can cause great harm to many departments of national defense and national economy such as aviation, communication, electric power, building and the like. Therefore, the generation mechanism, process and protection of the lightning phenomenon are always concerned by meteorologists, physicists and engineering experts.
Thunderclouds are a prerequisite for generating lightning discharge, and the charge distribution in the thunderclouds is uneven and often forms a plurality of charge-dense centers, so that after the first back strike of the first charge center is completed, the second, third or more centers can be caused to reach the ground along a channel of the first back strike, so that most of the lightning presents multiple characteristics, and 80% -85% of the lightning contains two or more back strikes. For the power industry, the lightning protection of the power transmission line is an important link for ensuring the safe and stable operation of the power grid, and according to statistics, the lightning stroke accidents account for more than 60 percent of the tripping accidents of the high-voltage overhead power transmission line.
The traditional high-voltage large-current test device is a single-time impact device and is used for simulating single lightning stroke, and the simulation of multiple lightning strokes can not be realized, such as a triple lightning stroke simulation test device. The test object of the existing multiple lightning stroke simulation test device is a Surge Protector (SPD), the charging voltage of an impact generator of the SPD is only dozens of kilovolts, the voltage is relatively low and is not influenced by the current and the voltage of an adjacent discharging device in the measurement or control process, in order to better simulate the high-voltage and large-current multiple lightning stroke device in the nature, a simple and easy way is to carry out parallel test on a plurality of impact current devices, so that the problem of influence on other impact current devices when a certain impact current device discharges is generated, the traditional high-voltage device grounding requirement is single grounding from a test article to a test hall, under the condition, the interference in the air when a certain impact current device discharges after being charged is generated, the potential rise caused by the rise of the ground potential is generated, and the other impact current devices are triggered mistakenly, therefore, the method is a matter of great concern in protecting the equipment itself and taking effective grounding measures when a plurality of surge current equipment is used.
Disclosure of Invention
The application provides a protection circuit is prevented mistake by triple thunderbolt, provides a special protection and ground connection mode, has solved the problem of the mistake that exists triggers and equipment protection itself among the traditional a plurality of impulse current equipment parallel test.
The technical scheme adopted by the application for solving the technical problems is as follows:
a triple lightning stroke anti-false triggering protection circuit comprises a first impulse current device, a second impulse current device, a third impulse current device, a grounding loop, a triggering unit and a test article;
the trigger unit is connected with the first impulse current device, the second impulse current device and the third impulse current device and is used for controlling the discharging sequence of the first impulse current device, the second impulse current device and the third impulse current device;
the connecting lines of the first impulse current device, the second impulse current device and the third impulse current device are all connected with a protection loop in series;
the grounding loop comprises a first grounding connection line, a second grounding connection line, a third grounding connection line and a fourth grounding connection line, wherein the first grounding connection line, the second grounding connection line and the third grounding connection line are connected in series, one end of the third grounding connection line is connected with a grounding grid, the other end is connected with a second grounding connecting wire, one end of the second grounding connecting wire is connected with a third grounding connecting wire, the other end is connected with a first grounding connecting wire, one end of a fourth grounding connecting wire is connected with a grounding grid, the other end is connected with the test article, the discharging sequence of the first impulse current device, the second impulse current device and the third impulse current device is in reverse connection sequence with the internal wiring of the grounding loop, when the grounding wire is connected, the third impulse current device discharges firstly, the second impulse current device discharges secondly, and the first impulse current device discharges finally;
the first impulse current equipment is connected with the first grounding connecting line, the second impulse current equipment is connected with the second grounding connecting line, and the third impulse current equipment is connected with the third grounding connecting line.
Optionally, the protection circuit includes a first protection circuit, a second protection circuit, and a third protection circuit;
one end of the first protection loop is connected with the first impulse current equipment, and the other end of the first protection loop is connected with the high-voltage end of the test article;
one end of the second protection loop is connected with the second impulse current equipment, and the other end of the second protection loop is connected with the high-voltage end of the test article;
and one end of the third protection loop is connected with the third impulse current equipment, and the other end of the third protection loop is connected with the high-voltage end of the test article.
Optionally, the first protection loop includes a first thyristor and a first ball gap, one end of the first thyristor is connected to the first impulse current device, the other end of the first thyristor is connected to the first ball gap, one end of the first ball gap is connected to the first thyristor, and the other end of the first ball gap is connected to the test sample;
the second protection loop comprises a second thyristor and a second ball gap, one end of the second thyristor is connected with the second impulse current device, the other end of the second thyristor is connected with the second ball gap, one end of the second ball gap is connected with the second thyristor, and the other end of the second ball gap is connected with the test article;
the third protection loop comprises a third thyristor and a third ball gap, one end of the third thyristor is connected with the third impact current device, the other end of the third thyristor is connected with the third ball gap, one end of the third ball gap is connected with the third thyristor, and the other end of the third ball gap is connected with the test article;
the first protection circuit, the second protection circuit and the third protection circuit are all connected with the test article in series;
the conducting directions of the first thyristor, the second thyristor and the third thyristor point to the test article.
Optionally, the first ground connection line, the second ground connection line, the third ground connection line, and the fourth ground connection line are copper wires with transparent insulating sheaths, and the insulation level of the copper wires is greater than 5 kV.
Optionally, the forward conduction voltage of the first thyristor is smaller than the charging voltage of the first inrush current device, and the reverse voltage is larger than the larger value of the charging voltages of the second inrush current device and the third inrush current device;
the forward conduction voltage of the second thyristor is smaller than the charging voltage of the second impulse current device, and the reverse voltage of the second thyristor is larger than the larger value of the charging voltage of the first impulse current device and the third impulse current device;
and the forward conduction voltage of the third thyristor is smaller than the charging voltage of the third impulse current device, and the reverse voltage of the third thyristor is larger than the larger value of the charging voltage of the first impulse current device and the second impulse current device.
Optionally, the first spherical gap, the second spherical gap and the third spherical gap are all spherical, the diameters of the first spherical gap, the second spherical gap and the third spherical gap are not less than 500mm, and the supporting distance to the ground is greater than the minimum distance required by the rated voltage of the inrush current device.
Optionally, the first inrush current device, the second inrush current device, and the third inrush current device are insulated from ground, and the insulation distance satisfies a voltage drop U ═ k ═ IGmax ×, R of the maximum value of the tertiary inrush current IGmax over the ground resistance R, where k is 1.2 to 1.4, and R is the ground resistance.
Optionally, the test article is a lightning arrester.
The technical scheme provided by the application comprises the following beneficial technical effects:
the application provides a triple lightning stroke anti-false triggering protection circuit which comprises a first impact current device, a second impact current device, a third impact current device, a grounding loop, a triggering unit and a test article; the protection circuit is connected in series on the connecting line of the first impulse current device, the second impulse current device and the third impulse current device, the first impulse current device, the second impulse current device, the third impulse current device and the grounding circuit are connected in a specific wiring mode of each grounding connecting line, the purpose that each impulse current device sequentially generates triple impulse currents for a test article is achieved, each impulse current device is not mutually influenced, and the problem of false triggering in the traditional parallel test of a plurality of impulse current devices is effectively prevented. Through matching corresponding protection circuit and grounding circuit to each impact current device, the purpose of simulating the impact of triple lightning strikes to electrical equipment in nature is achieved, and meanwhile the purpose of protecting the lightning strike test device can be achieved. The device that provides in this application design is simple, convenient operation, stable performance, has certain suitability.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a connection mode of a triple lightning stroke anti-false triggering protection circuit according to an embodiment of the present application.
Description of reference numerals:
1-first impulse current equipment, 2-second impulse current equipment, 3-third impulse current equipment, 4-first protection circuit, 5-second protection circuit, 6-third protection circuit, 7-grounding circuit, 8-trigger unit and 9-test article.
Detailed Description
In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a connection mode of a triple lightning stroke anti-false triggering protection circuit according to an embodiment of the present application.
It should be noted that the triple lightning protection circuit against false triggering provided in the embodiment of the present application is also applicable to a double or multiple lightning simulation test device.
As shown in fig. 1, the triple lightning protection circuit provided in the embodiment of the present application includes a first inrush current device 1, a second inrush current device 2, a third inrush current device 3, a ground return 7, a trigger unit 8, and a test sample 9;
the trigger unit 8 is connected with the first inrush current device 1, the second inrush current device 2 and the third inrush current device 3, and is configured to control a discharging sequence of the first inrush current device 1, the second inrush current device 2 and the third inrush current device 3;
in practical application, the present apparatus includes two control units, one is the control unit of the inrush current device itself, i.e. the control unit for charging the first inrush current device 1, the second inrush current device 2 and the third inrush current device 3 itself, and the other is the control unit for controlling the discharging sequence of the three inrush current devices, i.e. the trigger unit 8. The triggering unit 8 generates three time-sequential triggering pulses, typically optical signals, as required for controlling the triggering sequence of the inrush current device 1, the inrush current device 2 and the inrush current device 3. The charging sequence can be set to charge the first impulse current device 1, the second impulse current device 2 and the third impulse current device 3 simultaneously, after charging is completed, the third impulse current device 3 is firstly triggered to discharge, the second impulse current device 2 is triggered again after a certain time interval T1, and the first impulse current device 1 is triggered again after a certain time interval T2, so that triple lightning strikes are formed.
In this embodiment, as shown in fig. 1, the ground circuit 7 includes a first ground connection line R1, a second ground connection line R2, a third ground connection line R3 and a fourth ground connection line R4, wherein the first ground connection line R1, the second ground connection line R2 and the third ground connection line R3 are connected in series, one end of the third ground connection line R3 is connected to the ground net R, the other end is connected to the second ground connection line R2, one end of the second ground connection line R2 is connected to the third ground connection line R3, the other end is connected to the first ground connection line R1, one end of the fourth ground connection line R4 is connected to the ground net R, and the other end is connected to the test article 9;
first impulse current device 1 is connected in the first ground connection line R1 of earth mat R farthest end and is connected, second impulse current device 2 is connected in the second ground connection line of earth mat R middle-end and is connected R2, third impulse current device 3 is connected in the third ground connection line of earth mat R nearest end and is connected R3, consequently, first impulse current device 1, second impulse current device 2 and third impulse current device 3 discharge the order with ground return 7 internal connection is reverse connection order, when above-mentioned earth connection mode, third impulse current device 3 discharges earlier, second impulse current device 2 discharges secondly, first impulse current device 1 discharges last.
Meanwhile, the connection lines of the first impulse current device 1, the second impulse current device 2 and the third impulse current device 3 are all connected with a protection circuit in series.
The utility model provides a protection circuit is prevented spurious triggering by triple thunderbolt, through at first impulse current equipment 1, all series connection has the protection return circuit on second impulse current equipment 2 and third impulse current equipment 3's the connecting wire, and first impulse current equipment 1, each specific mode of connection of ground connection line in second impulse current equipment 2 and third impulse current equipment 2 and the ground return circuit 7, thereby reach the purpose that each impulse current equipment produced triple impulse current to trial-product 9 in proper order, and each impulse current equipment does not influence each other, the problem of spurious triggering that exists in having prevented a plurality of traditional impulse current equipment parallel test has effectively. Through matching corresponding protection circuit and grounding circuit to each impact current device, the purpose of simulating the impact of triple lightning strikes to electrical equipment in nature is achieved, and meanwhile the purpose of protecting the lightning strike test device can be achieved. The device that provides in this application design is simple, convenient operation, stable performance, has certain suitability.
As an embodiment, the protection circuit comprises a first protection circuit 4, a second protection circuit 5 and a third protection circuit 6;
one end of the first protection loop 4 is connected with the first impulse current device 1, and the other end of the first protection loop is connected with the high-voltage end of the test article 9;
one end of the second protection loop 5 is connected with the second impulse current device 2, and the other end of the second protection loop is connected with the high-voltage end of the test article 9;
one end of the third protection loop 6 is connected with the third impulse current device 3, and the other end is connected with the high-voltage end of the test article 9.
Specifically, the first protection circuit 4 includes a first thyristor D1 and a first ball gap G1, one end of the first thyristor D1 is connected to the first inrush current device 1, the other end of the first thyristor is connected to the first ball gap G1, one end of the first ball gap G1 is connected to the first thyristor D1, and the other end of the first ball gap G1 is connected to the test article 9;
the second protection circuit 5 comprises a second thyristor D2 and a second ball gap G2, one end of the second thyristor D2 is connected with the second inrush current device 2, the other end of the second thyristor D2 is connected with the second ball gap G2, one end of the second ball gap G2 is connected with the second thyristor D2, and the other end of the second ball gap G2 is connected with the test article 9;
the third protection circuit 6 includes a third thyristor D3 and a third ball gap G3, one end of the third thyristor D3 is connected to the third inrush current device 3, the other end is connected to the third ball gap G3, one end of the third ball gap G3 is connected to the third thyristor D3, and the other end is connected to the test article 9;
the first protection circuit 4, the second protection circuit 5 and the third protection circuit 6 are all connected in series with the test object 9, and the conduction directions of the first thyristor D1, the second thyristor D2 and the third thyristor D3 all point to the test object 9.
In addition, the grounding connecting wires R1, R2, R3 and R4 are all copper wires with transparent insulating jackets, and the insulation level is generally more than 5 kV.
Specifically, the insulation level of the capacitor is required to meet the voltage drop U, U of the three-time impulse current maximum IG on the grounding resistor>IG R, R is a ground resistance. In order to reduce the impact of the ground circuit voltage drop on the impulse current equipment, copper materials with the smallest cross-sectional area are generally adopted
C is 268, te is waveform duration, and the sectional area should not be less than 100mm in general2And the length is the shortest distance from the grounding position ground grid R to each impulse current device.
The forward conduction voltage of the first thyristor is smaller than the charging voltage of the first impulse current device 1, and the reverse voltage is larger than the larger value of the charging voltage in the second impulse current device 2 and the third impulse current device 3;
the forward conduction voltage of the second thyristor is smaller than the charging voltage of the second impulse current device 2, and the reverse voltage is larger than the larger value of the charging voltage in the first impulse current device 1 and the third impulse current device 3;
the forward conduction voltage of the third thyristor is smaller than the charging voltage of the third inrush current device 3, and the reverse voltage is larger than the larger value of the charging voltage in the first inrush current device 1 and the second inrush current device 2. The distance of the protective thyristor to the ground is larger than the minimum electrical distance required by the surge current equipment.
The first spherical gap, the second spherical gap and the third spherical gap are all spherical, the diameters of the first spherical gap, the second spherical gap and the third spherical gap are not less than 500mm, and the supporting distance to the ground is greater than the minimum distance required by rated voltage of the impulse current equipment.
The first inrush current device 1, the second inrush current device 2 and the third inrush current device 3 are insulated from ground by themselves, and the insulation distance satisfies the voltage drop U ═ k ═ IGmax ×, R, k is 1.2-1.4, R is the ground resistance of the maximum value of the tertiary inrush current IGmax over the ground resistance.
Optionally, the test article 9 is a lightning arrester.
It should be noted that the technical solutions provided in the embodiments of the present application are all obtained in practical operation experiments, have a certain experimental basis, and are verified for many times to obtain results.
In summary, the embodiment of the present application provides a triple lightning protection circuit against false triggering, which includes a first impulse current device 1, a second impulse current device 2, a third impulse current device 3, a ground loop 7, a triggering unit 8, and a test sample 9; through all series connection have the protection circuit on first impulse current equipment 1, second impulse current equipment 2 and third impulse current equipment 3's connecting line to and first impulse current equipment 1, second impulse current equipment 2 and third impulse current equipment 3 and the specific mode of connection of each ground connection connecting line in ground return 7, thereby reach each impulse current equipment and produce triple impulse current's purpose to trial 9 in proper order, and each impulse current equipment each other does not influence, the problem of the spurious triggering that exists in the parallel test of a plurality of traditional impulse current equipment has effectively been prevented. Through matching corresponding protection circuit and grounding circuit 7 to each impact current device, the purpose of simulating the impact of triple lightning strikes to electrical equipment in the nature is achieved, and meanwhile the purpose of protecting the lightning strike test device can be achieved. The device that provides in this application design is simple, convenient operation, stable performance, has certain suitability.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A triple lightning stroke anti-false triggering protection circuit is characterized by comprising a first impact current device (1), a second impact current device (2), a third impact current device (3), a grounding loop (7), a triggering unit (8) and a test article (9);
the trigger unit (8) is connected with the first impulse current device (1), the second impulse current device (2) and the third impulse current device (3) and is used for controlling the discharging sequence of the first impulse current device (1), the second impulse current device (2) and the third impulse current device (3);
the connecting lines of the first impulse current device (1), the second impulse current device (2) and the third impulse current device (3) are all connected with a protection loop in series;
the grounding loop (7) comprises a first grounding connecting wire, a second grounding connecting wire, a third grounding connecting wire and a fourth grounding connecting wire, wherein the first grounding connecting wire, the second grounding connecting wire and the third grounding connecting wire are connected in series, one end of the third grounding connecting wire is connected with a grounding grid, the other end of the third grounding connecting wire is connected with the second grounding connecting wire, one end of the second grounding connecting wire is connected with the third grounding connecting wire, the other end of the second grounding connecting wire is connected with the first grounding connecting wire, one end of the fourth grounding connecting wire is connected with the grounding grid, the other end of the fourth grounding connecting wire is connected with the test article (9), the discharging sequence of the first impulse current device (1), the second impulse current device (2) and the third impulse current device (3) and the internal wiring of the grounding loop (7) are in a reverse connection sequence, and when the grounding wire is connected, the third impulse current device (, the second inrush current device (2) is discharged secondly, and the first inrush current device (1) is discharged lastly;
the first impulse current device (1) is connected with the first grounding connecting line, the second impulse current device (2) is connected with the second grounding connecting line, and the third impulse current device (3) is connected with the third grounding connecting line.
2. Triple lightning protection false triggering protection circuit according to claim 1, characterized in that said protection circuit comprises a first protection circuit (4), a second protection circuit (5) and a third protection circuit (6);
one end of the first protection loop (4) is connected with the first impulse current device (1), and the other end of the first protection loop is connected with the high-voltage end of the test article (9);
one end of the second protection loop (5) is connected with the second impulse current device (2), and the other end of the second protection loop is connected with the high-voltage end of the test article (9);
one end of the third protection loop (6) is connected with the third impulse current device (3), and the other end of the third protection loop is connected with the high-voltage end of the test article (9).
3. The triple lightning protection false triggering protection circuit according to claim 2, wherein the first protection loop (4) comprises a first thyristor and a first ball gap, one end of the first thyristor is connected with the first inrush current device (1), the other end of the first thyristor is connected with the first ball gap, one end of the first ball gap is connected with the first thyristor, and the other end of the first ball gap is connected with the test article (9);
the second protection circuit (5) comprises a second thyristor and a second ball gap, one end of the second thyristor is connected with the second impulse current device (2), the other end of the second thyristor is connected with the second ball gap, one end of the second ball gap is connected with the second thyristor, and the other end of the second ball gap is connected with the test article (9);
the third protection loop (6) comprises a third thyristor and a third ball gap, one end of the third thyristor is connected with the third impulse current device (3), the other end of the third thyristor is connected with the third ball gap, one end of the third ball gap is connected with the third thyristor, and the other end of the third ball gap is connected with the test article (9);
the first protection circuit (4), the second protection circuit (5) and the third protection circuit (6) are all connected with the test article (9) in series;
the conducting directions of the first thyristor, the second thyristor and the third thyristor point to the test article (9).
4. The triple lightning protection false triggering protection circuit of claim 1, wherein the first, second, third and fourth ground connection lines are copper wires with transparent insulating sheaths and have an insulation level greater than 5 kV.
5. Triple lightning protection false triggering protection circuit according to claim 3, characterized in that the first thyristor forward conduction voltage is smaller than the charging voltage of the first inrush current device (1), and the reverse voltage is larger than the larger value of the charging voltage in the second inrush current device (2) and the third inrush current device (3);
the forward conduction voltage of the second thyristor is smaller than the charging voltage of the second impulse current device (2), and the reverse voltage is larger than the larger value of the charging voltage in the first impulse current device (1) and the third impulse current device (3);
the forward conduction voltage of the third thyristor is smaller than the charging voltage of the third impulse current device (3), and the reverse voltage is larger than the larger value of the charging voltage in the first impulse current device (1) and the second impulse current device (2).
6. The triple lightning protection circuit of claim 3, wherein the first, second and third ball gaps are all spherical, have a diameter of not less than 500mm, and are supported at a distance greater than a minimum distance required by a rated voltage of a surge current device.
7. Triple lightning protection against false triggering according to claim 1, characterized in that the first (1), second (2) and third (3) surge current devices are themselves insulated against ground and the insulation distance satisfies the three surge current maximum value IGmax with a voltage drop U-k IGmax R over the ground resistance R, k being 1.2-1.4, R being the ground resistance.
8. The triple lightning protection false triggering protection circuit of claim 1, wherein the test article (9) is a lightning arrester.
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| CN202011178298.7A CN112180225A (en) | 2020-10-29 | 2020-10-29 | Triple lightning stroke anti-false triggering protection circuit |
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