CN105319491A - Transient overvoltage testing circuit and transient overvoltage testing device - Google Patents
Transient overvoltage testing circuit and transient overvoltage testing device Download PDFInfo
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- CN105319491A CN105319491A CN201510675199.2A CN201510675199A CN105319491A CN 105319491 A CN105319491 A CN 105319491A CN 201510675199 A CN201510675199 A CN 201510675199A CN 105319491 A CN105319491 A CN 105319491A
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- 238000012360 testing method Methods 0.000 title claims abstract description 95
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- 238000002955 isolation Methods 0.000 claims abstract description 69
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Abstract
The invention discloses a transient overvoltage testing circuit and transient overvoltage testing device. The transient overvoltage testing circuit comprises a gas discharge tube, a first power supply module used for a first power supply, at least one second power supply module used for a second power supply, and a switch isolation circuit. The switch isolation circuit comprises a first input end, a second input end and an output end. The first input end of the switch isolation circuit is connected with an output end of the first power supply module, the second input end of the switch isolation circuit is connected with an output end of the second power supply module, and the output end of the switch isolation circuit is connected with the gas discharge tube. The switch isolation circuit is used for isolating the first power supply module from the second power supply module and carrying out parallel outputting. By adopting the transient overvoltage testing circuit, the transient overvoltage testing cost of the gas discharge tube is lowered.
Description
Technical field
The present invention relates to a kind of transient overvoltage test circuit and transient overvoltage testing apparatus.
Background technology
When electric system normally runs, under electrical equipment is operated in rated voltage, but, due to the reason such as thunder and lightning, misoperation, the fault of equipment own or setting parameter be improper, the voltage of some part in electric system can be made to raise suddenly, and exceed its rated voltage exponentially, this kind of voltage raises and is referred to as transient overvoltage, also claim TOV (TransientOverVoltage), this transient overvoltage such as disposing is not in time fallen, and can cause damage to equipment.
At present; for preventing transient overvoltage to the infringement of electrical equipment; usual meeting is provided with gas-discharge tube in the protection circuit of inside electric appliance; when transient overvoltage exceed gas put the voltage breakdown of discharge tube time; gas-discharge tube conducting; superpotential is released in ground loop, and reaches the object of protection electrical equipment.
But gas-discharge tube must carry out relevant transient overvoltage test when dispatching from the factory, to judge that whether it is qualified.This test, require that the least power of testing apparatus is 360KVA (kilovolt/peace) in theory, and its power capacity of general factory substantially can not more than 200KVA, be difficult to autonomous test, therefore most of factory takes testing agency gas-discharge tube being delivered to specialty to test, and the testing cost of professional testing agency is higher, and transport is wasted time and energy back and forth.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of transient overvoltage test circuit, is intended to reduce testing cost.
The invention provides a kind of transient overvoltage test circuit, this transient overvoltage test circuit comprises gas-discharge tube, for providing the first power module of the first power supply, at least one is for providing the second source module of second source, switch isolation circuit, described switch isolation circuit comprises first input end, second input end and output terminal, the first input end of described switch isolation circuit is connected with the output terminal of described first power module, second input end of described switch isolation circuit is connected with the output terminal of described second source module, the output terminal of described switch isolation circuit is connected with described gas-discharge tube, described switch isolation circuit be used for by described first power module and described second source module mutually isolated after carry out Parallel opertation.
Preferably, described transient overvoltage test circuit also comprises ac input end, phasing degree testing circuit and control circuit, and described phasing degree testing circuit, described first power module are connected with described ac input end respectively with second source module; Described phasing degree testing circuit is connected with described control circuit respectively with described switch isolation circuit;
Wherein, described first power module, the AC power for being inputted by described ac input end is converted to described first power supply;
Described second source module, the AC power for being inputted by described ac input end is converted to described second source;
Described phasing degree testing circuit, for detecting the phasing degree of the AC power of described ac input end input;
Described control circuit, for after the power-up, and when the phasing degree that described phasing degree testing circuit detects the AC power that described ac input end inputs first is 90 °, control described switch isolation circuit open, with make described switch isolation circuit by described first power module and described second source module mutually isolated after carry out Parallel opertation.
Preferably, described switch isolation circuit comprises the first thyristor, the second thyristor, the 3rd thyristor and the 4th thyristor, the anode of described first thyristor is connected with the negative electrode of described second thyristor, the negative electrode of described first thyristor is connected with the anode of described second thyristor, and the public point that the negative electrode of described first thyristor is connected with the anode of described second thyristor is the first output terminal of described switch isolation circuit; The anode of described 3rd thyristor is connected with the negative electrode of described 4th thyristor, the negative electrode of described 3rd thyristor is connected with the anode of described 4th thyristor, and the public point that the negative electrode of described 3rd thyristor is connected with the anode of described 4th thyristor is the second output terminal of described switch isolation circuit; The anode of the anode of described first thyristor, the negative electrode of described second thyristor, described 3rd thyristor and the negative electrode of described 4th thyristor interconnected after be connected with the first end of described gas-discharge tube; The controlled end of described first thyristor, described second thyristor, described 3rd thyristor and described 4th thyristor is all connected with described control circuit.
Preferably, described control circuit is used for when the phasing degree that described phasing degree testing circuit detects the AC power that described ac input end inputs first is 90 °, control described second thyristor and described 4th turn on thyristors, control described first thyristor and described 3rd thyristor shutoff.
Preferably, described transient overvoltage test circuit also comprises zero cross detection circuit, and described zero cross detection circuit is connected respectively with described ac input end and described control circuit; Wherein,
Described zero cross detection circuit, becomes from positive half-wave the zero crossing that negative half-wave or negative half-wave become positive half-wave for detecting input ac power;
Described control circuit, for when described alternating current becomes negative half-wave from positive half-wave, controls described first thyristor and described 3rd turn on thyristors, controls described second thyristor and described 4th thyristor shutoff; When described alternating current from bear half-wave become positive half-wave time, control described first thyristor and described 3rd thyristor turn off, control described second thyristor and described 4th turn on thyristors.
Preferably, described first power module comprises the first transformer, and described second source module comprises the second transformer; External communication electricity is accessed after the primary side parallel connection of described first transformer and described second transformer, the output terminal of described first Circuit Fault on Secondary Transformer is connected with the first input end of described switch isolation circuit, and the input end of described first Circuit Fault on Secondary Transformer is connected with the second end of described gas-discharge tube; The output terminal of described second Circuit Fault on Secondary Transformer is connected with the second input end of described switch isolation circuit, the input end of described second Circuit Fault on Secondary Transformer and the connection of described gas-discharge tube.
Preferably, described transient overvoltage test circuit also comprises the first current limiting element and the second current limiting element, and described first current limiting element is connected between the output terminal of described first Circuit Fault on Secondary Transformer and the first input end of described switch isolation circuit; Described second current limiting element is connected between the output terminal of described second Circuit Fault on Secondary Transformer and the second input end of described switch isolation circuit.
Preferably, described first current limiting element and the second current limiting element are respectively adjustable resistance.
Preferably, described transient state overvoltage experimental circuit also comprises an air switch, described air switch is arranged at the primary side input end of described first transformer and described second transformer, for controlling unlatching or the shutoff of the general supply of described transient overvoltage test circuit.
The present invention also provides a kind of transient overvoltage testing apparatus, described transient overvoltage testing apparatus comprises the transient overvoltage test circuit as above described in any one, this transient overvoltage test circuit comprises gas-discharge tube, for providing the first power module of the first power supply, at least one is for providing second source module and the switch isolation circuit of second source, described switch isolation circuit comprises first input end, second input end and output terminal, the first input end of described switch isolation circuit is connected with the output terminal of described first power module, second input end of described switch isolation circuit is connected with the output terminal of described second source module, the output terminal of described switch isolation circuit is connected with described gas-discharge tube, described switch isolation circuit be used for by described first power module and described second source module mutually isolated after carry out Parallel opertation.
The present invention is by arranging gas-discharge tube, for providing the first power module of the first power supply, at least one is for providing second source module and the switch isolation circuit of second source, described switch isolation circuit be used for by described first power module and described second source module mutually isolated after carry out Parallel opertation, achieve a kind of transient overvoltage test circuit, this circuit provides required voltage and current to gas-discharge tube respectively by adopting two-way power sources in parallel to export, and enhance output power, therefore, carrying out Power convert without the need to high-power transformer can power needed for experimental facilities, thus realize the transient overvoltage experiment of gas-discharge tube, like this, without the need to censorship, greatly reduce testing cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the structure according to these accompanying drawings can also obtain other accompanying drawing.
Fig. 1 is the structured flowchart of transient overvoltage test circuit of the present invention;
Fig. 2 is the structural representation of transient overvoltage test circuit of the present invention.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 10 | Gas-discharge tube | S4 | 4th thyristor |
| 20 | First power module | G1 | First gate circuit transistor gate |
| 30 | Second source module | G2 | Second gate circuit transistor gate |
| 40 | Switch isolation circuit | G3 | 3rd 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 | 3rd thyristor | GDT | Gas-discharge tube |
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Need explanation, all directivity instruction (such as up, down, left, right, before and afters in the embodiment of the present invention ...) only for explaining the relative position relation, motion conditions etc. under a certain particular pose (as shown in drawings) between each parts, if when this particular pose changes, then directionality instruction also correspondingly changes thereupon.
In addition, relate to the description of " first ", " second " etc. in the present invention only for describing object, and instruction can not be interpreted as or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In addition; technical scheme between each embodiment can be combined with each other; but must be can be embodied as basis with those of ordinary skill in the art; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exist, also not within the protection domain of application claims.
The invention provides a kind of transient overvoltage test circuit, suitable gas discharge tube transient overvoltage testing apparatus.
With reference to Fig. 1, the invention provides a kind of transient overvoltage test circuit, this transient overvoltage test circuit comprises gas-discharge tube 10, for providing the first power module 20 of the first power supply, at least one is for providing second source module 30 and the switch isolation circuit 40 of second source, described switch isolation circuit 40 comprises first input end, second input end and output terminal, the first input end of described switch isolation circuit 40 is connected with the output terminal of described first power module 20, second input end of described switch isolation circuit 40 is connected with the output terminal of described second source module 30, the output terminal of described switch isolation circuit 40 is connected with described gas-discharge tube 10, described switch isolation circuit 40 for by described first power module 20 and described second source module 30 mutually isolated after carry out Parallel opertation.
It should be noted that, described first power module 20 is for providing a high voltage, described second source module 30 is for providing a big current, by switch isolation module 40, high voltage and big current are applied to gas-discharge tube 10 two ends simultaneously, thus meet the transient overvoltage test of gas-discharge tube 10, illustrate below in conjunction with concrete data:
According to relevant national standard (GB/T18802.1-2011) in the transient overvoltage test of gas-discharge tube 10, the both end voltage of gas-discharge tube 10 need reach 1200V, and the electric current flowing through gas-discharge tube 10 need reach 300A.In the present invention, the first power module 20 is for providing 1200V voltage, 1A electric current, second source module 30 is for the voltage of the electric current and 50V that provide 300A, two power supplys different due to voltage can not be directly in parallel, therefore need by switch isolation circuit 40, first power module the 20 and the 1 power module to be isolated, and superpose by the electric current of switch isolation module by the first power module the 20 and the 1 power supply mould and export gas-discharge tube 10 to, export the 1200V voltage of the first power module 20 and the 50V voltage of the one or two power supply mould to gas-discharge tube 10 two ends simultaneously, gas-discharge tube 10 both end voltage is 1200V, thus make gas-discharge tube 10 reach open-circuit voltage 1200VAC, the experiment condition of breakdown current 300A, and power is now less than 20KVA, meet the transient overvoltage test condition of gas-discharge tube 10.
In the present invention, the required electric current carrying out transient overvoltage experimental gas discharge tube 10 can be provided by multiple power module parallel connection, electric current needed for gas-discharge tube 10 can be met owing to adopting a power module, based on cost-saving consideration, in the present embodiment, a second source module 30 is adopted to provide gas-discharge tube 10 to carry out electric current needed for relay protection.
The present invention is by arranging gas-discharge tube 10, for providing the first power module 20 of the first power supply, at least one is for providing second source module 30 and the switch isolation circuit 40 of second source, described switch isolation circuit be used for by described first power module 20 and described second source module 30 mutually isolated after carry out Parallel opertation, achieve a kind of transient overvoltage test circuit, this circuit provides required voltage and current to gas-discharge tube 10 respectively by adopting two-way power sources in parallel to export, and enhance output power, therefore, carrying out Power convert without the need to high-power transformer can power needed for experimental facilities, thus realize the transient overvoltage experiment of gas-discharge tube 10, like this, without the need to censorship, greatly reduce testing cost.
With reference to Fig. 2, further, described transient overvoltage test circuit also comprises ac input end 50, phasing degree testing circuit 60 and control circuit 70, and described phasing degree testing circuit 60, described first power module 20 are connected with described ac input end 50 respectively with second source module 30; Described phasing degree testing circuit 60 is connected with described control circuit 70 respectively with described switch isolation circuit 40; Described first power module 20 is converted to described first power supply for the AC power inputted by described ac input end 50; Described second source module 30 is converted to described second source for the AC power inputted by described ac input end 50; Described phasing degree testing circuit 60 is for detecting the phasing degree of the AC power of described ac input end 50 input; Described control circuit 70 is for after the power-up, and when the phasing degree that described phasing degree testing circuit 60 detects the AC power that described ac input end 50 inputs first is 90 °, control described switch isolation circuit 40 to open, with make described switch isolation circuit 40 by described first power module 20 and described second source module 30 mutually isolated after carry out Parallel opertation.
It should be noted that, in the present embodiment, control circuit 70 adopts single-chip microcomputer to realize, accurately to detect input AC electricity phase place.
Particularly, described switch isolation circuit 40 comprises the first thyristor S1, the second thyristor S2, the 3rd thyristor S3 and the 4th thyristor S4, the anode of described first thyristor S1 is connected with the negative electrode of described second thyristor S2, the negative electrode of described first thyristor S1 is connected with the anode of described second thyristor S2, and the public point that the negative electrode of described first thyristor S1 is connected with the anode of described second thyristor S2 is the first output terminal of described switch isolation circuit 40; The anode of described 3rd thyristor S3 is connected with the negative electrode of described 4th thyristor S4, the negative electrode of described 3rd thyristor S3 is connected with the anode of described 4th thyristor S4, and the public point that the negative electrode of described 3rd thyristor S3 is connected with the anode of described 4th thyristor S4 is the second output terminal of described switch isolation circuit 40; The anode of the anode of described first thyristor S1, the negative electrode of described second thyristor S2, described 3rd thyristor S3 and the negative electrode of described 4th thyristor S4 interconnected after be connected with the first end of described gas-discharge tube 10; The gate pole G1 of described first thyristor S1, the gate pole G2 of described second thyristor S2, the gate pole G3 of described 3rd thyristor S3 and the gate pole G4 of described 4th thyristor S4 are all connected with described control circuit 70.
It should be noted that, thyristor can work under high voltage, big current condition, and its course of work can control, and can meet the transient overvoltage testing requirement of gas-discharge tube 10 very well.
Further, described transient overvoltage test circuit also comprises zero cross detection circuit 80, and described zero cross detection circuit 80 is connected respectively with described ac input end 50 and described control circuit 70.Zero cross detection circuit 80 becomes from positive half-wave the zero crossing that negative half-wave or negative half-wave become positive half-wave for detecting input ac power, input ac voltage zero crossing detected and output detections signal to control circuit 70, with the on off state of thyristor in gauge tap buffer circuit 40.
Particularly, described control circuit 70, for when described alternating current becomes negative half-wave from positive half-wave, controls described first thyristor S1 and described 3rd thyristor S3 conducting, controls described second thyristor S2 and described 4th thyristor S4 turns off; When described alternating current from bear half-wave become positive half-wave time, control described first thyristor S1 and described 3rd thyristor S3 turns off, control described second thyristor S2 and described 4th thyristor S4 conducting.
It should be noted that, according to national relevant regulations, the experimental period of the transient overvoltage experiment of gas-discharge tube 10 needs to reach 200ms (millisecond), when the phasing degree that described phasing degree testing circuit 60 detects the AC power that described ac input end 50 inputs first is 90 °, described control circuit 70 controls described second thyristor S2 and described 4th thyristor S4 conducting, and control circuit 70 starts timing, when described zero cross detection circuit 80 detects input AC electricity zero crossing first after described switch isolation circuit 40 is opened, described control circuit 70 controls described first thyristor S1 and described 3rd thyristor S3 conducting and turns off described second thyristor S2 and described 4th brilliant lock, when input AC electricity zero crossing again being detected, then described control circuit 70 controls described second thyristor S2 and described 4th thyristor S4 conducting, described first thyristor S1 and described 3rd thyristor S3, second thyristor S2 and described 4th thyristor S4 cyclic switching conducting like this, when the time reaches 200ms, cutoff thyristor, experiment terminates.
Particularly, described first power module 20 comprises the first transformer T1, and described second source module 30 comprises the second transformer T2; External communication electricity is accessed after the primary side parallel connection of described first transformer T1 and described second transformer T2, the output terminal of described first transformer T1 secondary side is connected with the first input end of described switch isolation circuit 40, and the input end of described first transformer T1 secondary side is connected with the second end of described gas-discharge tube 10; The output terminal of described second transformer T2 secondary side is connected with the second input end of described switch isolation circuit 40, the described input end of the second transformer T2 secondary side and the connection of described gas-discharge tube 10.
Further, described transient overvoltage test circuit also comprises the first current limiting element and the second current limiting element, between the output terminal that described first current limiting element is connected to described first transformer T1 secondary side and the first input end of described switch isolation circuit 40; Between the output terminal that described second current limiting element is connected to described second transformer T2 secondary side and the second input end of described switch isolation circuit 40.In the present embodiment, described first current limiting element and the second current limiting element adopt the first potentiometer RP1 and the second potentiometer RP2 to realize respectively.By regulating the first potentiometer RP1 and the second potentiometer RP2 to access resistance size in transient test circuit, the first power supply and second source is regulated to be added to the size of electric current and voltage on gas-discharge tube 10.First potentiometer RP1 and the second potentiometer RP2 cooperatively interacts, the power at adjustable gas discharge tube 10 two ends, makes to arrange voltage and current more flexibly when carrying out transient overvoltage experiment.
Further, described transient state overvoltage experimental circuit also comprises an air switch K1, described air switch K1 is arranged at the primary side input end of described first transformer T1 and described second transformer T2, for controlling unlatching or the shutoff of the general supply of described transient overvoltage test circuit.
To sum up, complete explanation is done to the workflow of transient overvoltage test circuit:
First, close the general supply air switch K1 of transient overvoltage test circuit, the conducting when input AC electricity phase place is 90 °, control circuit 70 controls described second thyristor S2, 4th thyristor S4 conducting, and start timing, described first power supply provides the voltage of the 1200v needed for experiment to gas-discharge tube 10 (i.e. gas-discharge tube GDT), electric current is provided to be approximately 1A, described second source provides the electric current of the 300A needed for experiment to gas-discharge tube GDT, the voltage provided is about 50v, the 1200V voltage that described first power supply provides punctures described gas-discharge tube 10 and enters arc voltage (about about 20V), described second source 30 provides 300A electric current to flow into described gas-discharge tube 10, thus make 1200v needed for described satisfied experiment, the condition of 300A, when after input AC electricity zero crossing, namely negative half-cycle is entered, described control circuit 70 controls described first thyristor S1 and described 3rd thyristor S3 conducting, when input voltage enters positive half period again, control circuit 70 controls described second thyristor S2, the 4th thyristor S4 conducting, and so circulation carries out work, when control circuit 70 timing reaches 200ms, control circuit 70 turns off all thyristors, and experiment terminates.The present invention provides the voltage of the 1200v needed for experiment by described first transformer T1 to gas-discharge tube 10, electric current is provided to be approximately 1A, described second transformer T2 provides the electric current of the 300A needed for experiment to gas-discharge tube 10, the voltage provided is about 50v, gas-discharge tube 10 two ends reach open-circuit voltage 1200VAC, puncture the experiment condition of after-current 300A, and power is now less than 20KVA, achieve a kind of transient overvoltage test circuit of low cost.
The present invention also provides a kind of transient overvoltage testing apparatus, and in one embodiment, described transient overvoltage testing apparatus comprises above-mentioned transient overvoltage test circuit; The detailed construction of described transient overvoltage test circuit can refer to above-described embodiment, repeats no more herein; Be understandable that, owing to employing above-mentioned transient overvoltage test circuit in transient overvoltage testing apparatus, therefore, the embodiment of this transient overvoltage testing apparatus comprises whole technical schemes of the whole embodiment of above-mentioned transient overvoltage test circuit, and the technique effect reached is also identical, does not repeat them here.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a transient overvoltage test circuit, it is characterized in that, comprise gas-discharge tube, for providing the first power module of the first power supply, at least one is for providing the second source module of second source, switch isolation circuit, described switch isolation circuit comprises first input end, second input end and output terminal, the first input end of described switch isolation circuit is connected with the output terminal of described first power module, second input end of described switch isolation circuit is connected with the output terminal of described second source module, the output terminal of described switch isolation circuit is connected with described gas-discharge tube, described switch isolation circuit be used for by described first power module and described second source module mutually isolated after carry out Parallel opertation.
2. transient overvoltage test circuit as claimed in claim 1, it is characterized in that, described transient overvoltage test circuit also comprises ac input end, phasing degree testing circuit and control circuit, and described phasing degree testing circuit, described first power module are connected with described ac input end respectively with second source module; Described phasing degree testing circuit is connected with described control circuit respectively with described switch isolation circuit;
Wherein, described first power module, the AC power for being inputted by described ac input end is converted to described first power supply;
Described second source module, the AC power for being inputted by described ac input end is converted to described second source;
Described phasing degree testing circuit, for detecting the phasing degree of the AC power of described ac input end input;
Described control circuit, for after the power-up, and when the phasing degree that described phasing degree testing circuit detects the AC power that described ac input end inputs first is 90 °, control described switch isolation circuit open, with make described switch isolation circuit by described first power module and described second source module mutually isolated after carry out Parallel opertation.
3. transient overvoltage test circuit as claimed in claim 2, it is characterized in that, described switch isolation circuit comprises the first thyristor, the second thyristor, the 3rd thyristor and the 4th thyristor, the anode of described first thyristor is connected with the negative electrode of described second thyristor, the negative electrode of described first thyristor is connected with the anode of described second thyristor, and the public point that the negative electrode of described first thyristor is connected with the anode of described second thyristor is the first output terminal of described switch isolation circuit; The anode of described 3rd thyristor is connected with the negative electrode of described 4th thyristor, the negative electrode of described 3rd thyristor is connected with the anode of described 4th thyristor, and the public point that the negative electrode of described 3rd thyristor is connected with the anode of described 4th thyristor is the second output terminal of described switch isolation circuit; The anode of the anode of described first thyristor, the negative electrode of described second thyristor, described 3rd thyristor and the negative electrode of described 4th thyristor interconnected after be connected with the first end of described gas-discharge tube; The controlled end of described first thyristor, described second thyristor, described 3rd thyristor and described 4th thyristor is all connected with described control circuit.
4. transient overvoltage test circuit as claimed in claim 3, it is characterized in that, described control circuit is used for when the phasing degree that described phasing degree testing circuit detects the AC power that described ac input end inputs first is 90 °, control described second thyristor and described 4th turn on thyristors, control described first thyristor and described 3rd thyristor shutoff.
5. transient overvoltage test circuit as claimed in claim 4, it is characterized in that, described transient overvoltage test circuit also comprises zero cross detection circuit, and described zero cross detection circuit is connected respectively with described ac input end and described control circuit; Wherein,
Described zero cross detection circuit, becomes from positive half-wave the zero crossing that negative half-wave or negative half-wave become positive half-wave for detecting input ac power;
Described control circuit, for when described alternating current becomes negative half-wave from positive half-wave, controls described first thyristor and described 3rd turn on thyristors, controls described second thyristor and described 4th thyristor shutoff; When described alternating current from bear half-wave become positive half-wave time, control described first thyristor and described 3rd thyristor turn off, control described second thyristor and described 4th turn on thyristors.
6. the transient overvoltage test circuit as described in any one of claim 1-5, is characterized in that, described first power module comprises the first transformer, and described second source module comprises the second transformer; External communication electricity is accessed after the primary side parallel connection of described first transformer and described second transformer, the output terminal of described first Circuit Fault on Secondary Transformer is connected with the first input end of described switch isolation circuit, and the input end of described first Circuit Fault on Secondary Transformer is connected with the second end of described gas-discharge tube; The output terminal of described second Circuit Fault on Secondary Transformer is connected with the second input end of described switch isolation circuit, the input end of described second Circuit Fault on Secondary Transformer and the connection of described gas-discharge tube.
7. transient overvoltage test circuit as claimed in claim 6, it is characterized in that, described transient overvoltage test circuit also comprises the first current limiting element and the second current limiting element, and described first current limiting element is connected between the output terminal of described first Circuit Fault on Secondary Transformer and the first input end of described switch isolation circuit; Described second current limiting element is connected between the output terminal of described second Circuit Fault on Secondary Transformer and the second input end of described switch isolation circuit.
8. transient overvoltage test circuit as claimed in claim 7, it is characterized in that, described first current limiting element and the second current limiting element are respectively adjustable resistance.
9. transient overvoltage test circuit as claimed in claim 1, it is characterized in that, described transient state overvoltage experimental circuit also comprises an air switch, described air switch is arranged at the primary side input end of described first transformer and described second transformer, for controlling unlatching or the shutoff of the general supply of described transient overvoltage test circuit.
10. a transient overvoltage testing apparatus, is characterized in that, described transient overvoltage testing apparatus comprises the transient overvoltage test circuit as described in claim 1-9 any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510675199.2A CN105319491B (en) | 2015-10-16 | 2015-10-16 | Transient overvoltage test circuit and transient overvoltage test equipment |
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| CN201510675199.2A CN105319491B (en) | 2015-10-16 | 2015-10-16 | Transient overvoltage test circuit and transient overvoltage test equipment |
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| CN105319491A true CN105319491A (en) | 2016-02-10 |
| CN105319491B CN105319491B (en) | 2018-08-14 |
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