CN105319491B - Transient overvoltage test circuit and transient overvoltage test equipment - Google Patents
Transient overvoltage test circuit and transient overvoltage test equipment Download PDFInfo
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- CN105319491B CN105319491B CN201510675199.2A CN201510675199A CN105319491B CN 105319491 B CN105319491 B CN 105319491B CN 201510675199 A CN201510675199 A CN 201510675199A CN 105319491 B CN105319491 B CN 105319491B
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Abstract
The invention discloses a kind of transient overvoltage test circuit and transient overvoltage test equipments, the transient overvoltage test circuit includes gas-discharge tube, the first power module for providing the first power supply, at least one second power supply module for providing second source, switch isolation circuit, switch isolation circuit includes first input end, second input terminal and output end, the first input end of switch isolation circuit is connect with the output end of the first power module, second input terminal of switch isolation circuit and the output end of second power supply module connect, the output end of switch isolation circuit is connect with gas-discharge tube；Switch isolation circuit is used for the mutually isolated rear progress Parallel opertation of the first power module and second power supply module.The present invention can reduce the transient overvoltage testing cost of gas-discharge tube.
Description
Technical field
The present invention relates to a kind of transient overvoltage test circuit and transient overvoltage test equipments.
Background technology
When electric system normal operation, electrical equipment is operated under rated voltage, still, due to thunder and lightning, misoperation, is set
The reasons such as standby failure itself or parameter setting are improper, can be such that the voltage of certain parts in electric system increases suddenly, and at double
Ground is more than its rated voltage, and such voltage, which increases, is referred to as transient overvoltage, also referred to as TOV (Transient Over
Voltage), this transient overvoltage can damage equipment as discharged not in time.
Currently, to prevent damage of the transient overvoltage to electrical equipment, it will usually in the protection circuit of inside electric appliance
In be provided with gas-discharge tube, when transient overvoltage puts the breakdown voltage of discharge tube more than gas, gas-discharge tube conducting, will
Overvoltage is released in earth-return circuit, and achievees the purpose that protect electrical equipment.
However, gas-discharge tube must carry out related transient overvoltage test in manufacture, to judge whether it is qualified.This
Kind test, it is 360KVA (kilovolt/peace) theoretically to require the least power of test equipment, and its power capacity base of general factory
Originally 200KVA is not exceeded, it is difficult to complete autonomous test, therefore most of factory is usually to take gas-discharge tube being sent to specially
The testing agency of industry is tested, and the testing cost of professional testing agency is relatively high, and is transported back and forth time-consuming and laborious.
Invention content
The main purpose of the present invention is to provide a kind of transient overvoltage test circuits, it is intended to reduce testing cost.
The present invention provides a kind of transient overvoltage test circuit, the transient overvoltage test circuit include gas-discharge tube,
For provide the first power supply the first power module, it is at least one for provide second source second power supply module, switch every
From circuit, the switch isolation circuit includes first input end, the second input terminal and output end, and the of the switch isolation circuit
One input terminal is connect with the output end of first power module, the second input terminal of the switch isolation circuit and described second
The output end of power module connects, and the output end of the switch isolation circuit is connect with the gas-discharge tube；It is described switch every
It is used for the mutually isolated rear progress Parallel opertation of first power module and the second power supply module from circuit.
Preferably, the transient overvoltage test circuit further includes ac input end, phase angle detection circuit and control electricity
Road, the phase angle detection circuit, first power module and second power supply module are connect with the ac input end respectively；
The phase angle detection circuit and the switch isolation circuit are connect with the control circuit respectively；
Wherein, first power module, the AC power for inputting the ac input end are converted to described
One power supply；
The second power supply module, the AC power for inputting the ac input end are converted to second electricity
Source；
The phase angle detection circuit, the phase angle of the AC power for detecting the ac input end input；
The control circuit is used for after the power-up, and detects that the exchange is defeated for the first time in the phase angle detection circuit
When the phase angle for entering the AC power of end input is 90 °, controls the switch isolation circuit and open, so that the switch isolation is electric
Road by first power module and the second power supply module it is mutually isolated after carry out Parallel opertation.
Preferably, the switch isolation circuit includes the first thyristor, the second thyristor, third thyristor and the 4th brilliant lock
Pipe, the anode of first thyristor connect with the cathode of second thyristor, the cathode of first thyristor with it is described
The anode of second thyristor connects, the public point that the cathode of first thyristor is connect with the anode of second thyristor
For the first output end of the switch isolation circuit；The anode of the third thyristor and the cathode of the 4th thyristor connect
Connect, the cathode of the third thyristor is connect with the anode of the 4th thyristor, the cathode of the third thyristor with it is described
The public point of the anode connection of 4th thyristor is the second output terminal of the switch isolation circuit；First thyristor
Anode, the cathode of second thyristor, the anode of the third thyristor and the 4th thyristor cathode interconnection after with
The first end of the gas-discharge tube connects；First thyristor, second thyristor, the third thyristor and described
The controlled end of 4th thyristor is connect with the control circuit.
Preferably, the control circuit is used to detect that the ac input end is defeated for the first time in the phase angle detection circuit
When the phase angle of the AC power entered is 90 °, second thyristor and the 4th turn on thyristors are controlled, control described the
One thyristor and third thyristor shutdown.
Preferably, the transient overvoltage test circuit further includes zero cross detection circuit, the zero cross detection circuit and institute
It states ac input end and the control circuit is separately connected；Wherein,
The zero cross detection circuit, becoming negative half-wave or negative half-wave from positive half-wave for detecting input ac power becomes just
The zero crossing of half-wave；
The control circuit, for when the alternating current becomes negative half-wave from positive half-wave, controlling first thyristor
With the third turn on thyristors, second thyristor and the 4th thyristor shutdown are controlled；When the alternating current is by bearing
When half-wave becomes positive half-wave, control first thyristor and third thyristor shutdown, control second thyristor and
4th turn on thyristors.
Preferably, first power module includes the first transformer, and the second power supply module includes the second transformer；
External communication electricity, first transformer secondary are accessed after the primary side parallel connection of first transformer and second transformer
The output end of side is connect with the first input end of the switch isolation circuit, the input terminal of first Circuit Fault on Secondary Transformer and institute
State the second end connection of gas-discharge tube；The output end of second Circuit Fault on Secondary Transformer and the second of the switch isolation circuit
Input terminal connects, the connection of the input terminal and the gas-discharge tube of second Circuit Fault on Secondary Transformer.
Preferably, the transient overvoltage test circuit further includes the first current limiting element and the second current limiting element, and described
One current limiting element be connected to the output end of first Circuit Fault on Secondary Transformer and the switch isolation circuit first input end it
Between；Second current limiting element is connected to the output end and the second of the switch isolation circuit of second Circuit Fault on Secondary Transformer
Between input terminal.
Preferably, first current limiting element and the second current limiting element are respectively adjustable resistance.
Preferably, the transient state overvoltage experimental circuit further includes an air switch, and the air switch is set to described
The primary side input terminal of one transformer and second transformer, the general supply for controlling the transient overvoltage test circuit
It is on or off.
The present invention also provides a kind of transient overvoltage test equipment, the transient overvoltage test equipment includes as above arbitrary
Transient overvoltage test circuit described in one, the transient overvoltage test circuit include gas-discharge tube, for providing first
First power module of power supply, at least one second power supply module and switch isolation circuit for providing second source, it is described
Switch isolation circuit includes first input end, the second input terminal and output end, the first input end of the switch isolation circuit with
The output end of first power module connects, the second input terminal and the second power supply module of the switch isolation circuit
Output end connects, and the output end of the switch isolation circuit is connect with the gas-discharge tube；The switch isolation circuit is used for
By the mutually isolated rear progress Parallel opertation of first power module and the second power supply module.
The present invention is by being arranged gas-discharge tube, the first power module for providing the first power supply, at least one being used for
The second power supply module and switch isolation circuit of second source are provided, the switch isolation circuit is used for the first power supply mould
Parallel opertation is carried out after block and the second power supply module are mutually isolated, realizes a kind of transient overvoltage test circuit, the electricity
Road exports by using two-way power sources in parallel and provides required voltage and current to gas-discharge tube respectively, and enhances output work
Rate, it is therefore not necessary to which high-power transformer carries out the power that power supply conversion can be needed for experimental facilities, to realize gas-discharge tube
Transient overvoltage experiment, in this way, be not necessarily to inspection, greatly reduce testing cost.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structure diagram of transient overvoltage test circuit of the present invention；
Fig. 2 is the structural schematic diagram of transient overvoltage test circuit of the present invention.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | Gas-discharge tube | S4 | 4th thyristor |
| 20 | First power module | G1 | First gate circuit transistor gate |
| 30 | Second power supply module | G2 | Second gate circuit transistor gate |
| 40 | Switch isolation circuit | G3 | Third gate circuit transistor gate |
| 50 | Ac input end | G4 | 4th gate circuit transistor gate |
| 60 | Phase detecting circuit | RP1 | First potentiometer |
| 70 | Control circuit | RP2 | Second potentiometer |
| 80 | Zero cross detection circuit | T1 | First transformer |
| S1 | First thyristor | T2 | Second transformer |
| S2 | Second thyristor | K1 | Air switch |
| S3 | Third thyristor | GDT | Gas-discharge tube |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining relative position relation, motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to
Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result,
Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can
To be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical solution occurs
Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model
Within enclosing.
The present invention provides a kind of transient overvoltage test circuit, suitable gas discharge tube transient overvoltage test equipment.
Referring to Fig.1, the present invention provides a kind of transient overvoltage test circuit, which includes gas
Discharge tube 10, the first power module 20 for providing the first power supply, at least one second source for providing second source
Module 30 and switch isolation circuit 40, the switch isolation circuit 40 include first input end, the second input terminal and output end, institute
The first input end for stating switch isolation circuit 40 is connect with the output end of first power module 20, the switch isolation circuit
40 the second input terminal is connect with the output end of the second power supply module 30, the output end of the switch isolation circuit 40 and institute
State the connection of gas-discharge tube 10；The switch isolation circuit 40 is used for first power module 20 and the second source mould
Parallel opertation is carried out after block 30 is mutually isolated.
It should be noted that first power module 20 is for providing a high voltage, the second power supply module 30
For providing a high current, high voltage and high current are applied to by 10 liang of gas-discharge tube by switch isolation module 40 simultaneously
End, to meet the transient overvoltage test of gas-discharge tube 10, below in conjunction with specific data explanation：
According to relevant national standard (GB/T18802.1-2011) in the transient overvoltage test of gas-discharge tube 10, gas
The both end voltage of body discharge tube 10 need to reach 1200V, flow through the electric current of gas-discharge tube 10 and need to reach 300A.First in the present invention
Power module 20 is for providing 1200V voltages, 1A electric currents；Second power supply module 30 is used to provide the electric current of 300A and the electricity of 50V
Pressure need to be by switch isolation circuit 40 by the first power module since two different power supplys of voltage cannot be directly in parallel
20 and the 1st power module is isolated, and by switch isolation module by the first power module 20 and the one or two power supply mould
Electric current is superimposed and exports to gas-discharge tube 10, while by the 1200V voltages of the first power module 20 and the one or two power supply mould
50V voltage outputs are to 10 both ends of gas-discharge tube, and 10 both end voltage of gas-discharge tube is 1200V, to make gas-discharge tube 10
Reach the experiment condition of open-circuit voltage 1200VAC, breakdown current 300A, and power at this time is less than 20KVA, meets
The transient overvoltage test condition of gas-discharge tube 10.
In the present invention, the required electric current for carrying out transient overvoltage experimental gas discharge tube 10 can be by the parallel connection of multiple power modules
It provides, since the required electric current of gas-discharge tube 10 can be met using power module, is based on cost-effective consideration,
In the present embodiment, electric current needed for relay protection is carried out to provide gas-discharge tube 10 using a second power supply module 30.
The present invention is by being arranged gas-discharge tube 10, the first power module 20 for providing the first power supply, at least one
Second power supply module 30 for providing second source and switch isolation circuit 40, the switch isolation circuit are used for described the
Parallel opertation is carried out after one power module 20 and the second power supply module 30 are mutually isolated, realizes a kind of transient overvoltage survey
Circuit is tried, which provides required voltage and current to gas-discharge tube 10 respectively by using the output of two-way power sources in parallel,
And output power is enhanced, it is therefore not necessary to high-power transformer carries out the power that power supply conversion can be needed for experimental facilities, to
Realize that the transient overvoltage experiment of gas-discharge tube 10 greatly reduces testing cost in this way, being not necessarily to inspection.
With reference to Fig. 2, further, the transient overvoltage test circuit further includes ac input end 50, phase angle detection
Circuit 60 and control circuit 70, the phase angle detection circuit 60, first power module 20 and second power supply module 30 are divided
It is not connect with the ac input end 50；The phase angle detection circuit 60 and the switch isolation circuit 40 respectively with the control
Circuit 70 processed connects；First power module 20 is used to be converted to the AC power that the ac input end 50 inputs described
First power supply；The second power supply module 30 is used to the AC power that the ac input end 50 inputs being converted to described second
Power supply；The phase angle detection circuit 60 is used to detect the phase angle of the AC power of the input of the ac input end 50；It is described
Control circuit 70 is used for after the power-up, and detects that the ac input end 50 inputs for the first time in the phase angle detection circuit 60
The phase angle of AC power when being 90 °, control the switch isolation circuit 40 and open, so that the switch isolation circuit 40 will
Parallel opertation is carried out after first power module 20 and the second power supply module 30 are mutually isolated.
It should be noted that in the present embodiment, control circuit 70 is realized using microcontroller, with to input AC electricity phase
Accurately detected.
Specifically, the switch isolation circuit 40 include the first thyristor S1, the second thyristor S2, third thyristor S3 and
4th thyristor S4, the anode of the first thyristor S1 are connect with the cathode of the second thyristor S2, the described first brilliant lock
The cathode of pipe S1 is connect with the anode of the second thyristor S2, cathode and second thyristor of the first thyristor S1
The public point of the anode connection of S2 is the first output end of the switch isolation circuit 40；The anode of the third thyristor S3
It is connect with the cathode of the 4th thyristor S4, the cathode of the third thyristor S3 connects with the anode of the 4th thyristor S4
It connects, the public point that the cathode of the third thyristor S3 is connect with the anode of the 4th thyristor S4 is the switch isolation
The second output terminal of circuit 40；The anode of the first thyristor S1, the cathode of the second thyristor S2, the third crystalline substance lock
It is connect with the first end of the gas-discharge tube 10 after the interconnection of the cathode of the anode of pipe S3 and the 4th thyristor S4；Described
The gate pole G1 of one thyristor S1, the gate pole G2 of the second thyristor S2, the gate pole G3 of the third thyristor S3 and described
The gate pole G4 of four thyristor S4 is connect with the control circuit 70.
It should be noted that thyristor can work under the conditions of high voltage, high current, and its course of work can control,
The transient overvoltage testing requirement of gas-discharge tube 10 can be met very well.
Further, the transient overvoltage test circuit further includes zero cross detection circuit 80, the zero cross detection circuit
80 are separately connected with the ac input end 50 and the control circuit 70.Zero cross detection circuit 80 is for detecting input AC electricity
Source becomes negative half-wave or negative half-wave from positive half-wave becomes the zero crossing of positive half-wave, detects input ac voltage zero crossing and exports
Signal is detected to control circuit 70, to control the on off state of thyristor in switch isolation circuit 40.
Specifically, the control circuit 70 is used for when the alternating current becomes negative half-wave from positive half-wave, control described the
One thyristor S1 and third thyristor S3 conductings control the second thyristor S2 and the 4th thyristor S4 shutdowns；
When the alternating current becomes positive half-wave from negative half-wave, the first thyristor S1 and third thyristor S3 shutdowns are controlled,
Control the second thyristor S2 and the 4th thyristor S4 conductings.
It should be noted that according to the relevant regulations of the state, the experimental period of the transient overvoltage experiment of gas-discharge tube 10
It needs to reach 200ms (millisecond), the friendship that the ac input end 50 inputs is detected for the first time in the phase angle detection circuit 60
When the phase angle in galvanic electricity source is 90 °, the control circuit 70 controls the second thyristor S2 and the 4th thyristor S4 is led
Logical, control circuit 70 starts timing；It is detected for the first time after the switch isolation circuit 40 unlatching in the zero cross detection circuit 80
When to input AC electricity zero crossing, the control circuit 70 controls the first thyristor S1 and third thyristor S3 conductings
And turn off the second thyristor S2 and the 4th brilliant lock, when detecting input AC electricity zero crossing again, the then control
Circuit 70 controls the second thyristor S2 and the 4th thyristor S4 conductings, and the first thyristor S1 and the third are brilliant
Brake tube S3, the second thyristor S2 and the such cyclic switching conductings of the 4th thyristor S4, when the time reaching 200ms, shutdown
Thyristor, experiment terminate.
Specifically, first power module 20 includes the first transformer T1, and the second power supply module 30 includes second
Transformer T2；External communication electricity is accessed after the primary side parallel connection of the first transformer T1 and the second transformer T2, it is described
The output end of first transformer T1 secondary sides is connect with the first input end of the switch isolation circuit 40, first transformer
The input terminal of T1 secondary sides is connect with the second end of the gas-discharge tube 10；The output end of the second transformer T2 secondary sides
It is connect with the second input terminal of the switch isolation circuit 40, input terminal and the gas of the second transformer T2 secondary sides
The connection of discharge tube 10.
Further, the transient overvoltage test circuit further includes the first current limiting element and the second current limiting element, described
It is first defeated to be connected to the output ends of the first transformer T1 secondary sides and the switch isolation circuit 40 for first current limiting element
Enter between end；Second current limiting element is connected to the output end and switch isolation electricity of the second transformer T2 secondary sides
Between second input terminal on road 40.In the present embodiment, first current limiting element and the second current limiting element are respectively adopted first
Potentiometer RP1 and the second potentiometer RP2 is realized.Transient state survey is accessed by adjusting the first potentiometer RP1 and the second potentiometer RP2
Resistance value size in circuit is tried, to adjust the first power supply and second source is added to the big of electric current and voltage on gas-discharge tube 10
It is small.First potentiometer RP1 and the second potentiometer RP2 cooperate, the power at 10 both ends of adjustable gas discharge tube so that carry out
Transient overvoltage more flexible setting voltage and current when testing.
Further, the transient state overvoltage experimental circuit further includes an air switch K1, and the air switch K1 is set to
The primary side input terminal of the first transformer T1 and the second transformer T2, for controlling the transient overvoltage test electricity
The general supply on road is switched on or off.
To sum up, complete explanation is made to the workflow of transient overvoltage test circuit：
First, the general supply air switch K1 for closing transient overvoltage test circuit, when input AC electricity phase is 90 °
Conducting, control circuit 70 controls the second thyristor S2, the 4th thyristor S4 conductings, and starts timing, first power supply
The 1200v voltages needed for experiment are provided to gas-discharge tube 10 (i.e. gas-discharge tube GDT), it is about 1A to provide electric current, described
Second source provides the 300A electric currents needed for experiment to gas-discharge tube GDT, and the voltage provided is about 50v, first power supply
The 1200V voltages of offer puncture the gas-discharge tube 10 and enter arc voltage (about 20V or so), the second source
30, which provide 300A electric currents, flows into the gas-discharge tube 10, to make the condition for meeting 1200v, 300A needed for experiment；When
After input AC electricity zero crossing, that is, enter negative half-cycle, the control circuit 70 controls the first thyristor S1 and described the
Three thyristor S3 conductings, when input voltage enters back into positive half period, control circuit 70 controls the second thyristor S2, the 4th crystalline substance
Brake tube S4 conductings, so cycle work, and when 70 timing of control circuit reaches 200ms, control circuit 70 turns off all crystalline substances
Brake tube, experiment terminate.The present invention provides the 1200v electricity needed for experiment by the first transformer T1 to gas-discharge tube 10
Pressure, it is about 1A to provide electric current, and the second transformer T2 provides the 300A electric currents needed for experiment to gas-discharge tube 10, provides
Voltage be about 50v, 10 both ends of gas-discharge tube have reached the experiment condition of electric current 300A after open-circuit voltage 1200VAC, breakdown,
And power at this time is less than 20KVA, realizes a kind of transient overvoltage test circuit of low cost.
The present invention also provides a kind of transient overvoltage test equipments, and in one embodiment, the transient overvoltage test is set
Standby includes above-mentioned transient overvoltage test circuit；The detailed construction of the transient overvoltage test circuit can refer to above-mentioned implementation
Example, details are not described herein again；It is understood that due to having used above-mentioned transient overvoltage to survey in transient overvoltage test equipment
Circuit is tried, therefore, the embodiment of the transient overvoltage test equipment includes above-mentioned transient overvoltage test circuit whole embodiments
Whole technical solutions, and the technique effect reached is also identical, and details are not described herein.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of transient overvoltage test circuit, which is characterized in that first including gas-discharge tube, for providing the first power supply
Power module, at least one second power supply module, switch isolation circuit for providing second source, wherein first power supply
Module is for providing voltage needed for test, and the second power supply module is for providing electric current needed for test；The switch isolation electricity
Road includes first input end, the second input terminal and output end, and the first input end of the switch isolation circuit is electric with described first
The output end of source module connects, and the second input terminal of the switch isolation circuit connects with the output end of the second power supply module
It connects, the output end of the switch isolation circuit is connect with the gas-discharge tube；The switch isolation circuit is used for described the
Parallel opertation is carried out after one power module and the second power supply module are mutually isolated.
2. transient overvoltage test circuit as described in claim 1, which is characterized in that the transient overvoltage test circuit is also
Including ac input end, phase angle detection circuit and control circuit, the phase angle detection circuit, first power module and
Second power supply module is connect with the ac input end respectively；The phase angle detection circuit and switch isolation circuit difference
It is connect with the control circuit；
Wherein, first power module, the AC power for inputting the ac input end are converted to first electricity
Source；
The second power supply module, the AC power for inputting the ac input end are converted to the second source；
The phase angle detection circuit, the phase angle of the AC power for detecting the ac input end input；
The control circuit is used for after the power-up, and detects the ac input end for the first time in the phase angle detection circuit
It when the phase angle of the AC power of input is 90 °, controls the switch isolation circuit and opens, so that the switch isolation circuit will
Parallel opertation is carried out after first power module and the second power supply module are mutually isolated.
3. transient overvoltage test circuit as claimed in claim 2, which is characterized in that the switch isolation circuit includes first
Thyristor, the second thyristor, third thyristor and the 4th thyristor, the anode of first thyristor and second thyristor
Cathode connection, the cathode of first thyristor connect with the anode of second thyristor, the moon of first thyristor
The public point that pole is connect with the anode of second thyristor is the first output end of the switch isolation circuit；The third
The anode of thyristor is connect with the cathode of the 4th thyristor, the cathode of the third thyristor and the 4th thyristor
Anode connect, the public point that the cathode of the third thyristor connect with the anode of the 4th thyristor for it is described switch every
Second output terminal from circuit；The anode of first thyristor, the cathode of second thyristor, the third thyristor
It is connect with the first end of the gas-discharge tube after the interconnection of the cathode of anode and the 4th thyristor；First thyristor,
The controlled end of second thyristor, the third thyristor and the 4th thyristor is connect with the control circuit.
4. transient overvoltage test circuit as claimed in claim 3, which is characterized in that the control circuit is used in the phase
When parallactic angle detection circuit detects that the phase angle of the AC power of ac input end input is 90 ° for the first time, control described the
Two thyristors and the 4th turn on thyristors control first thyristor and third thyristor shutdown.
5. transient overvoltage test circuit as claimed in claim 4, which is characterized in that the transient overvoltage test circuit is also
Including zero cross detection circuit, the zero cross detection circuit is separately connected with the ac input end and the control circuit；Wherein,
The zero cross detection circuit, becoming negative half-wave or negative half-wave from positive half-wave for detecting input ac power becomes positive half-wave
Zero crossing；
The control circuit, for when the alternating current becomes negative half-wave from positive half-wave, controlling first thyristor and institute
Third turn on thyristors is stated, second thyristor and the 4th thyristor shutdown are controlled；When the alternating current is by bearing half-wave
When becoming positive half-wave, first thyristor and third thyristor shutdown are controlled, controls second thyristor and described
4th turn on thyristors.
6. transient overvoltage test circuit as described in any one in claim 1-5, which is characterized in that first power module
Including the first transformer, the second power supply module includes the second transformer；First transformer and second transformer
Primary side parallel connection after access external communication electricity, the output end of first Circuit Fault on Secondary Transformer and the switch isolation circuit
First input end connects, and the input terminal of first Circuit Fault on Secondary Transformer is connect with the second end of the gas-discharge tube；It is described
The output end of second Circuit Fault on Secondary Transformer is connect with the second input terminal of the switch isolation circuit, second transformer secondary
The connection of the input terminal of side and the gas-discharge tube.
7. transient overvoltage test circuit as claimed in claim 6, which is characterized in that the transient overvoltage test circuit is also
Including the first current limiting element and the second current limiting element, first current limiting element is connected to the defeated of first Circuit Fault on Secondary Transformer
Between outlet and the first input end of the switch isolation circuit；Second current limiting element is connected to second transformer two
Between the output end of secondary side and the second input terminal of the switch isolation circuit.
8. transient overvoltage test circuit as claimed in claim 7, which is characterized in that first current limiting element and the second limit
Fluid element is respectively adjustable resistance.
9. transient overvoltage test circuit as claimed in claim 6, which is characterized in that the transient overvoltage test circuit is also
Including an air switch, the primary side that the air switch is set to first transformer and second transformer inputs
End, for control the transient overvoltage test circuit general supply it is on or off.
10. a kind of transient overvoltage test equipment, which is characterized in that the transient overvoltage test equipment includes such as claim
Transient overvoltage test circuit described in 1-9 any one.
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