CN103543395A - System and method for testing lightning impulse of electrical device - Google Patents
System and method for testing lightning impulse of electrical device Download PDFInfo
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Abstract
The invention provides a system for testing lightning impulse of an electrical device. The system for testing the lightning impulse of the electrical device comprises an impulse voltage generator, wherein a steepening loop used for secondary discharge is arranged between the impulse voltage generator and the electrical device to be tested. Due to the fact that the steepening loop is arranged, when discharging of the impulse voltage generator is carried out, the impulse voltage generator charges the steepening loop, and then a lightning impulse test is carried out on the electrical device to be tested through discharging of the steepening loop. Due to the facts that the secondary discharge technology is used, and lead inductance of the steepening loop is relatively low, the problem that due to the fact that high inductance of a loop of the impulse voltage generator has an influence on the front time and the oscillation amplitude, the standard code is broken is solved.
Description
Technical field
The present invention relates to the lightning impulse test field tests of power equipment, particularly a kind of lightning impulse test system and method for power equipment.
Background technology
In electric system, all generally to transmit or to carry out exchange of electric power by high pressure, this has higher proof voltage function with regard to causing at the power equipment of electric system, and in actual electric system, most equipment is all in rugged environment relatively, and due to impacts such as weather, as thunderstorm hour, also can there is larger impact to power equipment.Therefore for power equipment, there is higher lightning impulse Capability Requirement.Meanwhile, how to check the lightning impulse ability of power equipment also very important.
The lightning impulse test system equivalent electrical circuit of existing power equipment is as Fig. 1, and described impulse voltage generator comprises equivalent main capacitance C1, ball discharge gap G1, loop inductance L1, wave front resistance R1 and wave rear resistance R 2.Described equivalent main capacitance C1 one end is connected with described ball discharge gap G1 one end, after the other end of described equivalent main capacitance C1 is electrically connected to wave rear resistance R 2 as an output port of impulse voltage generator, the other end of described ball discharge gap G1 is connected with wave rear resistance R 2 with wave front resistance R1 respectively, one section of the other end link circuit inductance L 1 of described wave front resistance R1, the other end of described loop inductance L1 is as another output terminal of surge voltage.Treat that power equipment is connected across the output terminal of impulse voltage generator, capacitor C 2 is for treating power equipment entrance capacitance, and wherein equivalent main capacitance adopts the equivalent capacity in the multistage loop of Marx.
Its principle of work: first to equivalent main capacitance C1 charging, when the voltage of equivalent main capacitance C1 reaches certain amplitude, ball discharge gap G1 punctures, ball discharge gap G1 punctures rear equivalent main capacitance C1 and charges to capacitor C 2 through wave front resistance R1, loop inductance L1, and wherein capacitor C 2 is transformer entrance capacitance to be tried.Form lightning impulse wavefront, equivalent main capacitance C1, capacitor C 2 form lightning impulse wave rear through 2 electric discharges of wave rear resistance R simultaneously, described wavefront and wave rear are treated examination transformer and have been implemented lightning impulse, if now transformer non-fault occurs, think that transformer has met test request.
But concerning arbitrary impulse test loop, all inevitably have loop inductance L1, especially adopted the impulse voltage generator in the multistage loop of Marx, it comprised the inductance of impulse voltage generator body, the inductance of wavefront resistance R 1 and impulse voltage generator body to the inductance going between between tested transformer, this has just caused whole loop inductance larger.When impulse voltage generator generation discharged in series, the wavefront that loop inductance L1 will shock wave produces certain influence, and its can affect the wavefront time T 1 of shock wave on the one hand, can make on the other hand surge waveform vibrate.So, cause wavefront time T 1 to be greater than 1.56 μ s and/or vibration is greater than 10%, for obtaining the less wavefront time (preferably meeting standard code scope), inevitably will produce at lightning impulse peak value place vibration or overshoot.
In prior art in order to guarantee that wavefront time T 1 meets standard-required, may reduce wavefront resistance R 1, but there is the existence meeting of loop inductance L1 at surge waveform peak value place, to produce vibration overshoot, increase 1 pair of vibration overshoot of wavefront resistance R and have certain inhibiting effect, the in the situation that of this contradiction, often appear as and guarantee the wavefront time and phenomenon that the overshoot that makes to vibrate is greater than 10%, even for some product, also there will be the wavefront time of lightning impulse and the phenomenon that vibration overshoot does not all meet the demands.Although the method for shnt capacitor makes moderate progress to this situation in wavefront resistance R 1, can not fundamentally change the problem that loop inductance L1 exists.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of lightning impulse test system and method for taking into account the power equipment of wavefront time and vibration overshoot.
In order to solve above technical matters, the invention provides a kind of lightning impulse test system of power equipment, comprise impulse voltage generator, wherein, between described impulse voltage generator and power equipment to be tried, be provided with the steepness loop for secondary discharge.
Further, described steepness loop comprises that described load capacity C4 treats examination power equipment discharge by described discharge loop for replacing load capacity C4 and the discharge loop of power equipment to be tried.
Further, described discharge loop comprises steepness loop discharging gap G2, and described load capacity C4 is in parallel with described impulse voltage generator, and described steepness loop discharging gap G2 is series between described load capacity C4 and power equipment to be tried.
Further, described discharge loop also comprises steepness loop lead-in inductance L2, harmonic capacitor C 3 and wave regulating resistor R3; After described harmonic capacitor C 3 is in parallel with wave regulating resistor R3 again and described steepness loop lead-in inductance L2 be series between described load capacity C4 and described steepness loop discharging gap G2.
Further, described impulse voltage generator comprises equivalent main capacitance C1, ball discharge gap G1, loop inductance L1, wave front resistance R1, wave rear resistance R 2; Described equivalent main capacitance C1 one end is connected with described ball discharge gap G1 one end, after the other end of described equivalent main capacitance C1 is electrically connected to wave rear resistance R 2 as an output port of impulse voltage generator, the other end of described ball discharge gap G1 is connected with wave rear resistance R 2 with wave front resistance R1 respectively, one section of the other end link circuit inductance L 1 of described wave front resistance R1, the other end of described loop inductance L1 is as another output terminal of surge voltage.
Further, described loop inductance L1 comprise the inductance of impulse voltage generator body, the inductance of wavefront resistance and impulse voltage generator body to the lead-in inductance between power equipment to be tried.
Further, described wave front resistance R1 two ends are parallel with harmonic electric capacity.
Accordingly, in order to solve the problems of the technologies described above, the present invention also provides a kind of lightning impulse test method of power equipment, wherein, comprising:
By impulse voltage generator, produce surge voltage;
By described surge voltage, charged in steepness loop, then by described steepness loop, treat examination power equipment and discharge.
Further, describedly by described surge voltage, charged in steepness loop, then by described steepness loop, treat examination power equipment and discharge and comprise:
By described surge voltage, the load capacity in described steepness loop is charged;
When the voltage of described load capacity reaches certain amplitude, by the discharge loop in described steepness loop, treat examination power equipment discharge.
Further, when the described voltage as load capacity C4 reaches certain amplitude, by the discharge loop in described steepness loop, treat examination power equipment discharge and comprise:
When the voltage of described load capacity reaches certain amplitude, puncture the described steepness loop discharging gap of described discharge loop, described load capacity is to power equipment discharge described to be tried.
The lightning impulse test system and method for power equipment provided by the invention, by steepness loop is set, make impulse voltage generator treat examination power equipment by steepness loop and carry out lightning impulse test, and by load capacity and discharge loop are set in steepness loop, the Main Function of impulse voltage generator is become a higher surge voltage is provided, utilize this surge voltage to charge to load capacity, and then treat examination power equipment discharge by discharge loop.Use secondary discharge technology, can weaken like this impact of the loop inductance of impulse voltage generator on whole pilot system, and steepness loop lead-in inductance is relatively little, solved due to the large impact on wavefront time and oscillation amplitude of the loop inductance in impulse voltage generator.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the equivalent circuit diagram of the lightning impulse test system of existing power equipment;
Fig. 2 is the equivalent circuit diagram of an embodiment of the lightning impulse test system of power equipment of the present invention;
Fig. 3 is the process flow diagram of an embodiment of the lightning impulse test method of the power equipment of the present invention based on embodiment illustrated in fig. 2;
Fig. 4 is the surge waveform figure on middle C2 embodiment illustrated in fig. 2 and C4;
Fig. 5 is the surge waveform figure of the lightning impulse test system of the existing power equipment of Fig. 1;
Fig. 6 is the another kind of surge waveform figure of wave head resistance R 1 harmonic electric capacity in parallel in the lightning impulse test system of the existing power equipment of Fig. 1;
Fig. 7 is the surge waveform figure in middle steepness embodiment illustrated in fig. 2 loop.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it will be more clear making above-mentioned and other object of the present invention, Characteristics and advantages.In whole accompanying drawings, identical Reference numeral is indicated identical part.Deliberately do not draw in proportion accompanying drawing, focus on illustrating purport of the present invention.
Power equipment in the present invention refers to the equipment such as transformer in electric system and reactor that are applied to of high voltage large capcity that entrance capacitance C2 is larger.
In the lightning impulse test system of power equipment of the present invention and test method, be provided with steepness loop, its specific embodiment is as follows:
As shown in Figure 2, a kind of lightning impulse test system of power equipment, comprises impulse voltage generator, wherein, is provided with the steepness loop 1 for secondary discharge between impulse voltage generator and power equipment to be tried.Steepness loop 1 comprises the load capacity C4 that replaces transformer to be tried with, and a discharge loop, because this loop structure is simple, can make its loop inductance can become very little, thereby the wavefront time T 1 of the surge waveform producing can be less.
As shown in Figure 2, in the present embodiment, impulse voltage generator comprises equivalent main capacitance C1, ball discharge gap G1, loop inductance L1, wave front resistance R1 and wave rear resistance R 2.Equivalence main capacitance C1 one end is connected with ball discharge gap G1 one end, after the other end of equivalence main capacitance C1 is electrically connected to wave rear resistance R 2 as an output port of impulse voltage generator, the other end of ball discharge gap G1 is connected with wave rear resistance R 2 with wave front resistance R1 respectively, one section of the other end link circuit inductance L 1 of wave front resistance R1, the other end of loop inductance L1 is as another output terminal of surge voltage.Steepness loop 1 comprises load capacity C4, steepness loop lead-in inductance L2, harmonic capacitor C 3, wave regulating resistor R3, steepness loop discharging gap G2.Load capacity C4 is connected across two output terminals of impulse voltage generator.One end of steepness loop lead-in inductance L2 is electrically connected to load capacity C4 one end, the other end of steepness loop lead-in inductance L2 is electrically connected to one end of wave regulating resistor R3, the other end of wave regulating resistor R3 connects discharging gap G2 one end, steepness loop, between the steepness loop discharging gap G2 other end and the load capacity C4 other end, be in series with capacitor C 2, wherein capacitor C 2 is equivalent to transformer entrance capacitance to be tried, between transformer cross-over connection to be tried and steepness loop discharging gap G2 and load capacity C4.The two ends of wave regulating resistor R3 are parallel with harmonic capacitor C 3.
The embodiment of the present invention also provides a kind of test method of the lightning impulse test system based on power equipment shown in Fig. 2, and as shown in Figure 3, this test method comprises the following steps:
Step S100, equivalent main capacitance C1 charging.Specific implementation is: equivalent main capacitance C1 is via the DC power slow charging battery of fairing output.
Step S101, disruptive discharge ball gap G1.
Specific implementation is: when the voltage of equivalent main capacitance C1 reaches certain amplitude, G1 is breakdown for ball discharge gap.Step S100 and step S101 utilize impulse voltage generator to form surge voltage.
Step S102, load capacity C4 charging.
Specific implementation is: ball discharge gap G1 punctures rear equivalent main capacitance C1 and charges to load capacity C4 through wave front resistance R1, loop inductance L1.Now utilize load capacity C4 to serve as power equipment to be tried, the surge voltage that impulse voltage generator is formed puts on load capacity C4, and to load capacity, C4 charges.
Step S103, punctures steepness loop discharging gap G2.
Specific implementation is: when the voltage of load capacity C4 reaches certain amplitude, discharging gap G2 is breakdown in steepness loop.
Step S104, treats examination power equipment discharge.
Specific implementation is: after steepness loop discharging gap G2 punctures, load capacity C4 is through steepness loop lead-in inductance L2, harmonic capacitor C 3, wave regulating resistor R3 to capacitor C 2 chargings, and wherein capacitor C 2 is equivalent to transformer entrance capacitance to be tried.Form lightning impulse wavefront, capacitor C 2, load capacity C4 form lightning impulse wave rear through 2 electric discharges of wave rear resistance R simultaneously, wavefront and wave rear are treated examination transformer and have been implemented lightning impulse, if now transformer non-fault occurs, think that transformer has met test request, suitably reduce wave regulating resistor R3 and not only can effectively reduce wavefront time T 1, also can guarantee that vibration overshoot can be not excessive.
Owing to using behind steepness loop, impulse voltage generator is first discharged to steepness loop, discharge breakdown steepness loop discharging gap G2 after load capacity C4 in steepness loop is saturated, make thus the wavefront time no longer depend on impulse voltage generator, and depend primarily on steepness loop, because of steepness loop, there is less loop lead-in inductance again, thereby the wavefront time of surge waveform can be reduced, can meet again the requirement of oscillation peak.
As shown in Figure 4, (1) is the voltage waveform of load capacity C4 for load capacity C4 behind use steepness loop and the surge waveform in capacitor C 2, and (2) are the voltage waveforms of capacitor C 2.In figure, abscissa axis represents the lightning impulse time, and axis of ordinates represents the amplitude of lightning impulse, from figure, can clearly find out, after steepness loop discharging gap G2 electric discharge, just has voltage in capacitor C 2.
For the positive effect in steepness loop is described, illustrate below:
1. use conventional lightning impulse test system in Fig. 1, select C1=0.0625 μ F, C2=0.00894 μ F, R1=100 Ω, R2=770 Ω, L1=127 μ H, surge waveform is as Fig. 5, and in figure, abscissa axis represents the lightning impulse time, and axis of ordinates represents the amplitude of lightning impulse, wavefront time T 1=2.425 μ s, overshoot 23.2%
2. use conventional lightning impulse test system in Fig. 1, and on wave front resistance R1 shunt capacitance 5000pF, C1=0.0625 μ F, C2=0.00894 μ F, R1=180 Ω, R2=770 Ω, L1=127 μ H, surge waveform is as Fig. 6, in figure, abscissa axis represents the lightning impulse time, axis of ordinates represents the amplitude of lightning impulse, wavefront time T 1=1.777 μ s, and overshoot is less than 10%
3. use in Fig. 2 with the lightning impulse test system in steepness loop, select C1=0.0625 μ F, C2=0.00894 μ F, C3=3300pF, C4=0.03064 μ F, R1=60 Ω, R2=770 Ω, R3=135 Ω, L1=127 μ H, L2=55 μ H, surge waveform is as Fig. 7, and in figure, abscissa axis represents the lightning impulse time, and axis of ordinates represents the amplitude of lightning impulse, wavefront time T 1=1.470 μ s, overshoot is less than 5%
This shows: steepness loop reduces effect obviously to the wavefront time, steepness loop lead-in inductance L2 is numerically far smaller than impulse voltage generator loop inductance L1, so suitably reduce wave regulating resistor R3, not only can effectively reduce wavefront time T 1, also guarantee that vibration overshoot can be not excessive.
Use behind steepness loop, owing to having used secondary discharge technology, the efficiency of impact device declines to some extent, from 83%, drop to 58%, the selection of load capacity C4 has obvious impact to service efficiency, the less efficiency of load capacity C4 is higher, and load capacity C4 is larger, and the wavefront time is shorter, and the suitable selection of load capacity C4 can obtain best effect.
Should be noted that, in steepness loop when steepness loop discharging gap G2 punctures afterload capacitor C 4 through steepness loop lead-in inductance L2, harmonic capacitor C 3, wave regulating resistor R3 during to capacitor C 2 charging, equivalence main capacitance C1 also can be through wave front resistance R1, loop inductance L1, steepness loop lead-in inductance L2, harmonic capacitor C 3, wave regulating resistor R3 to capacitor C 2 chargings, the latter still has certain influence to the shape of wave head, so suitably adjust the numerical value of wave front resistance R1, wave regulating resistor R3, the shape of wave head is had to certain improvement.
Certainly, power equipment also can be reactor.
By steepness loop is set, make impulse voltage generator treat examination power equipment by steepness loop and carry out lightning impulse test, and by load capacity and discharge loop are set in steepness loop, the Main Function of impulse voltage generator is become a higher surge voltage is provided, utilize this surge voltage to charge to load capacity, and then treat examination power equipment discharge by discharge loop.Use secondary discharge technology, can weaken like this impact of the loop inductance of impulse voltage generator on whole pilot system, and steepness loop lead-in inductance is relatively little, solved due to the large impact on wavefront time and oscillation amplitude of the loop inductance in impulse voltage generator.
Although adopted secondary discharge technology, but impulse voltage generator still can be treated examination, power equipment exerts an influence, now, wave regulating resistor R3 and harmonic capacitor C 3 in discharge loop of the present invention, have been increased, by adjusting wave front resistance R1 and wave regulating resistor R3, be capable of regulating wave head shape, again reduced the impact of impulse voltage generator on whole test macro, farthest meet the requirement of test.
And the present invention can be by increasing a small amount of electrical equipment such as load capacity and discharging gap, the lightning impulse test that has solved at present domestic and international power equipment exists wavefront time and vibration overshoot not to meet the common problem of standard-required, the feature with small investment, instant effect, can, generally for Power Equipment Manufacturing Enterprise He Ge inspection body, greatly improve the test capability of power equipment lightning impulse.
In above description, a lot of details have been set forth so that fully understand the present invention.But above description is only preferred embodiment of the present invention, the present invention can implement to be much different from alternate manner described here, so the present invention is not subject to the restriction of disclosed concrete enforcement above.Any skilled personnel are not departing from technical solution of the present invention scope situation simultaneously, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Every content that does not depart from technical solution of the present invention,, all still belongs in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (10)
1. a lightning impulse test system for power equipment, comprises impulse voltage generator, it is characterized in that, is provided with the steepness loop for secondary discharge between described impulse voltage generator and power equipment to be tried.
2. the lightning impulse test system of power equipment according to claim 1, it is characterized in that, described steepness loop comprises that described load capacity C4 treats examination power equipment discharge by described discharge loop for replacing load capacity C4 and the discharge loop of power equipment to be tried.
3. the lightning impulse test system of power equipment according to claim 2, it is characterized in that, described discharge loop comprises steepness loop discharging gap G2, described load capacity C4 is in parallel with described impulse voltage generator, and described steepness loop discharging gap G2 is series between described load capacity C4 and power equipment to be tried.
4. the lightning impulse test system of power equipment according to claim 3, is characterized in that, described discharge loop also comprises steepness loop lead-in inductance L2, harmonic capacitor C 3 and wave regulating resistor R3; After described harmonic capacitor C 3 is in parallel with wave regulating resistor R3 again and described steepness loop lead-in inductance L2 be series between described load capacity C4 and described steepness loop discharging gap G2.
5. according to the lightning impulse test system of the power equipment described in claim 1-4 any one, it is characterized in that, described impulse voltage generator comprises equivalent main capacitance C1, ball discharge gap G1, loop inductance L1, wave front resistance R1, wave rear resistance R 2; Described equivalent main capacitance C1 one end is connected with described ball discharge gap G1 one end, after the other end of described equivalent main capacitance C1 is electrically connected to wave rear resistance R 2 as an output port of impulse voltage generator, the other end of described ball discharge gap G1 is connected with wave rear resistance R 2 with wave front resistance R1 respectively, one section of the other end link circuit inductance L 1 of described wave front resistance R1, the other end of described loop inductance L1 is as another output terminal of surge voltage.
6. the lightning impulse test system of power equipment according to claim 5, it is characterized in that, described loop inductance L1 comprise the inductance of impulse voltage generator body, the inductance of wavefront resistance and impulse voltage generator body to the lead-in inductance between power equipment to be tried.
7. the lightning impulse test system of power equipment according to claim 5, is characterized in that, described wave front resistance R1 two ends are parallel with harmonic electric capacity.
8. a lightning impulse test method for power equipment, is characterized in that, comprising:
By impulse voltage generator, produce surge voltage;
By described surge voltage, charged in steepness loop, then by described steepness loop, treat examination power equipment and discharge.
9. the lightning impulse test method of power equipment according to claim 8, is characterized in that, describedly by described surge voltage, is charged in steepness loop, then by described steepness loop, treats examination power equipment and discharge and comprise:
By described surge voltage, the load capacity in described steepness loop is charged;
When the voltage of described load capacity reaches certain amplitude, by the discharge loop in described steepness loop, treat examination power equipment discharge.
10. the lightning impulse test method of power equipment according to claim 9, is characterized in that, when the described voltage when load capacity reaches certain amplitude, treats examination power equipment discharge comprise by the discharge loop in described steepness loop:
When the voltage of described load capacity reaches certain amplitude, puncture the described steepness loop discharging gap of described discharge loop, described load capacity is to power equipment discharge described to be tried.
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| CN110456237A (en) * | 2019-07-19 | 2019-11-15 | 清华大学 | Reduce the system and method for Injection Current waveform wave head time in the artificial lightning stroke experiment in transmission line of electricity scene |
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Effective date of registration: 20210618 Address after: 252000 No.38 jingsan Road, Fenghuang Industrial Park, Dongchangfu District, Liaocheng City, Shandong Province Patentee after: Xinda Transformer Co.,Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 39 Patentee before: SHENYANG TRANSFORMER RESEARCH INSTITUTE Co.,Ltd. |