CN104407185A - Electric oscillating wave generator - Google Patents
Electric oscillating wave generator Download PDFInfo
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- CN104407185A CN104407185A CN201410742212.7A CN201410742212A CN104407185A CN 104407185 A CN104407185 A CN 104407185A CN 201410742212 A CN201410742212 A CN 201410742212A CN 104407185 A CN104407185 A CN 104407185A
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Abstract
An electric oscillating wave generator comprises an adjustable direct current power supply, a first switching device, a second switching device, a resonance inductor and tested electrical equipment, wherein the positive electrode side of the adjustable direct current power supply, the first switching device, the resonance inductor and the tested electrical equipment are sequentially connected in series, the other side of the tested electrical equipment and the negative electrode side of the adjustable direct current power supply are grounded, and the second switching device is connected in series with a series connection circuit of the resonance inductor and the tested electrical equipment. The converter adopts a series resonance soft switching technology and does not need to adopt a solid high voltage switch. The existing technical limitations to the tested electrical equipment are overcome, and the oscillating voltage amplitude can be raised to the highest grade at present.
Description
Technical field
The present invention relates to a kind of alternating wave generator, specifically input low-voltage dc voltage, do not need to adopt high-voltage switch gear, based on series resonance soft switch technique, electric power alternating wave generator.
Background technology
Damp oscillatory wave (DAC) detection technique is a kind of new technique for the on-the-spot insulating property Detection and diagnosis of high voltage electric power equip ment that recent domestic is paid close attention to, domesticly in the site tests such as cable, transformer, reactor, carry out practical application, on-the-spot to find and anatomy verification because manufacturing, laying, install all kinds of defects caused, achieve good effect.Be confined to existing technology, only carry out the rig-site utilization of power distribution network medium voltage electricity equipment insulating property Detection and diagnosis under damped oscillation wave voltage at present, the bottleneck and the research and apply of UHV (ultra-high voltage), extra-high voltage electric power equipment also possesses skills, relevant experience and data lack completely.
Find by prior art documents, Xia Rong, Zhao Jiankang, Ou Yangbenhong etc. " under damped oscillation wave voltage 110kV cross-linked cable insulating Performance Detection " (High-Voltage Technology, 36th volume the 7th phase in 2010, p1753-1759) describe function and the composition of typical crosslinked cable damp oscillatory wave test macro (OWTS).First high-voltage DC power supply is progressively charged to tested cable by LINEAR CONTINUOUS boosting mode, after making it to boost to preset value, solid high-voltage switch (laser triggering field effect transistor) is closed in 1us, tested electric cable capacitance and test loop mesohigh inductance is made to produce resonance, thus oscillation AC voltage is produced on tested cable, the duration is ms level.The ability of withstand high pressures direct current when solid high-voltage switch needs to have long, and switch motion completes in 1us, the technique needed is higher, it is the key that restriction improves damp oscillatory wave test voltage grade further, thus, current damp oscillatory wave test macro can also be applied to the test of mesolow crosslinked cable.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, propose a kind of electric power alternating wave generator, this generator adopts series resonance soft switch technique, does not need to adopt solid high-voltage switch.
The present invention is achieved by the following technical solutions, the present invention includes: adjustable type direct supply, the first switching device, second switch device, resonant inductance, tested power equipment, adjustable type DC power anode side, the first switching device, resonant inductance, tested power equipment are sequentially connected in series, and tested power equipment opposite side and adjustable type DC power cathode side joint ground, the series circuit of second switch device and resonant inductance, tested power equipment is connected in parallel.
Diode can also be accessed between adjustable type DC power anode side and the first switching device; diode forward is facing to adjustable type DC power anode side; make electric current can only from adjustable type DC power anode effluent to the first switching device, to protect adjustable type direct supply.
First switching device and second switch device be change-over switch state when the oscillating current flowing through resonant inductance is zero, and switching frequency is constant is the resonance frequency of resonant inductance and tested power equipment.The on off state of the first switching device and second switch device is inverse state always, thus only has the state of a control that two kinds discrete: the first switch device conductive, second switch device turn off or the first switching device turns off, second switch break-over of device.
Described oscillating current is sinusoidal waveform or cosine waveform, and flow to ground side through resonant inductance from the high-pressure side of tested power equipment, oscillating current is called forward; Otherwise be called oppositely.When oscillating current is forward, the first switch device conductive, second switch device turns off, and adjustable type direct supply charges to tested power equipment together with resonant inductance, and the oscillating voltage amplitude at tested power equipment two ends raises, and is referred to as oscillatory regime of boosting; When oscillating current is reverse, the first switching device turns off, second switch break-over of device, and tested power equipment and resonant inductance form loop damping vibration, are referred to as free-running operation.Within the cycle of each oscillating current, half period is all free-running operation for boosting oscillatory regime, half period are free-running operation or whole cycle.
Electric power alternating wave generator has two kinds of working conditions, the first situation keeps the wave of oscillation amplitude of tested power equipment constant, withstand voltage test is carried out to tested power equipment, first switching device is only relevant with the direction of resonance current with the control of second switch device, the only switching state when zero crossing, boosting oscillatory regime and free-running operation hocket, boosting oscillatory regime is consistent with the damping step-down of free-running operation to the boosting of tested power equipment, and the voltage oscillation wave amplitude reaching the tested power equipment of balance maintenance is constant; Always the second situation, after tested power equipment reaches the voltage oscillation wave amplitude of setting, is in free-running operation, until the voltage oscillation wave amplitude of tested power equipment is zero.
The voltage that first switching device and second switch device bear is adjustable type direct current power source voltage, the electric current passed through is oscillating current, oscillating current value is relevant with the voltage oscillation wave amplitude of tested power equipment, when single switching device is difficult to bear oscillating current, first switching device and second switch device are limited to oscillating current zero crossing switching state, the mode of multiple switching device parallel connection that can adopt first switching device and second switch device improves the ability by oscillating current, has current balance function.
Wave of oscillation boost process: the first stage is boosting oscillatory regime, tested power equipment initial voltage is zero, first switch device conductive, second switch device turn off, adjustable type direct supply charges to tested power equipment, the oscillating wave voltage at tested power equipment two ends is by sinusoidal first 1/4 periodic waveform change, oscillating current presses the change of cosine first 1/4 periodic waveform, until oscillating current is zero enter NextState; Subordinate phase is free-running operation, when oscillating current is zero, first switching device turns off, second switch break-over of device, tested power equipment and resonant inductance form loop damping vibration, oscillating current is oppositely by sinusoidal negative half period waveform change, the oscillating wave voltage at tested power equipment two ends presses half cycles deformation before cosine, until oscillating current is zero enter NextState; Phase III is boosting oscillatory regime, when oscillating current is zero, first switch device conductive, second switch device turn off, adjustable type direct supply charges to tested power equipment, the oscillating wave voltage at tested power equipment two ends presses the change of cosine second half waveform, oscillating current be forward by the positive half cycles deformation of sine, until oscillating current is zero enter NextState; Repeat subordinate phase and phase III, the oscillating wave voltage amplitude at tested power equipment two ends constantly raises, until reach setting value.
The amplitude of adjustable type direct supply next stage is determined by the boosting amplitude of tested power equipment next stage and the resonance current of current generation.
Compared with prior art, the present invention has following beneficial effect: the mode the first, adopting oscillation boosting, and it is lower that switching device is withstand voltage, and cost is low; The second, do not need high-voltage DC power supply, volume is little, is convenient to transport; Three, for tested power equipment, overcome prior art limitation, the amplitude of oscillating voltage can be elevated to current highest ranking.
Accompanying drawing explanation
Fig. 1 is an embodiment according to the technology of the present invention;
Fig. 2 is the output voltage of the wave of oscillation boost process of the embodiment of the present invention, 1-adjustable type direct supply, 2-oscillating current, 3-oscillating voltage, and I-boosts oscillatory regime, II-free-running operation.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, comprise according to embodiments of the invention: adjustable type direct supply U
dC, the first switching device S
1, second switch device S
2, resonant inductance L
r, tested power equipment C
test, adjustable type direct supply U
dCside of the positive electrode, the first switching device S
1, resonant inductance L
r, tested power equipment C
testhigh-pressure side is sequentially connected in series, and tested power equipment C
testground side and adjustable type direct supply U
dCnegative side ground connection, with resonant inductance L
r, tested power equipment C
testconnect rear and second switch device S
2be connected in parallel.
Adjustable type direct supply U
dCwith the first switching device S
1between can also connect a diode D
1, diode D
1the flow direction is from adjustable type direct supply U
dCto the first switching device S
1, namely forward is facing to adjustable type direct supply U
dC.
As shown in Figure 2, the wave of oscillation boost process for the embodiment of the present invention: the first stage is boosting oscillatory regime, tested power equipment C
testinitial voltage is the zero, first switching device S
1conducting, second switch device S
2turn off, adjustable type direct supply U
dCto tested power equipment C
testcharging, tested power equipment C
testthe oscillating wave voltage U at two ends
cby sinusoidal first 1/4 periodic waveform change, oscillating current I
lby cosine first 1/4 periodic waveform change, until oscillating current I
lbe zero enter NextState; Subordinate phase is free-running operation, oscillating current I
lwhen being zero, the first switching device S
1shutoff, second switch device S
2conducting, tested power equipment C
testwith resonance inductance L
rformation loop damping vibrates, oscillating current I
lfor oppositely changing by sinusoidal negative half period waveform, tested power equipment C
testthe oscillating wave voltage U at two ends
cby half cycles deformation before cosine, until oscillating current I
lbe zero enter NextState; Phase III is boosting oscillatory regime, oscillating current I
lwhen being zero, the first switching device S
1conducting, second switch device S
2turn off, adjustable type direct supply U
dCto tested power equipment C
testcharging, tested power equipment C
testthe oscillating wave voltage U at two ends
cby the change of cosine second half waveform, oscillating current I
lfor forward is by sinusoidal positive half cycles deformation, until oscillating current I
lbe zero enter NextState; Repeat subordinate phase and phase III, tested power equipment C
testthe oscillating wave voltage U at two ends
camplitude constantly raises, until reach setting value.
First switching device and second switch device adopt the mode of 5 IRFP450 parallel connections, and withstand voltage 500V bears electric current 70A, and tested power equipment can produce the oscillating wave voltage of 35kV amplitude.
Claims (10)
1. an electric power alternating wave generator, comprise: adjustable type direct supply, the first switching device, second switch device, resonant inductance, tested power equipment, adjustable type DC power anode side, the first switching device, resonant inductance, tested power equipment are sequentially connected in series, and tested power equipment opposite side and adjustable type DC power cathode side joint ground, the series circuit of second switch device and resonant inductance, tested power equipment is connected in parallel.
2. electric power alternating wave generator according to claim 1, it is characterized in that, first switching device and second switch device be change-over switch state when the oscillating current flowing through resonant inductance is zero, and switching frequency is constant is the resonance frequency of resonant inductance and tested power equipment.
3. electric power alternating wave generator according to claim 1, it is characterized in that, the on off state of the first switching device and second switch device is inverse state always, thus only has the state of a control that two kinds discrete: the first switch device conductive, second switch device turn off or the first switching device turns off, second switch break-over of device.
4. electric power alternating wave generator according to claim 2, is characterized in that, described oscillating current is sinusoidal waveform or cosine waveform, and flow to ground side through resonant inductance from the high-pressure side of tested power equipment, oscillating current is called forward, otherwise is called oppositely; When oscillating current is forward, the first switch device conductive, second switch device turns off, and adjustable type direct supply charges to tested power equipment together with resonant inductance, and the oscillating voltage amplitude at tested power equipment two ends raises, and is referred to as oscillatory regime of boosting; When oscillating current is reverse, the first switching device turns off, second switch break-over of device, and tested power equipment and resonant inductance form loop damping vibration, are referred to as free-running operation.
5. electric power alternating wave generator according to claim 4, is characterized in that, within the cycle of each oscillating current, half period is all free-running operation for boosting oscillatory regime, half period are free-running operation or whole cycle.
6. electric power alternating wave generator according to claim 1, it is characterized in that, electric power alternating wave generator has two kinds of working conditions, the first situation keeps the wave of oscillation amplitude of tested power equipment constant, withstand voltage test is carried out to tested power equipment, first switching device is only relevant with the direction of resonance current with the control of second switch device, the only switching state when zero crossing, boosting oscillatory regime and free-running operation hocket, boosting oscillatory regime is consistent with the damping step-down of free-running operation to the boosting of tested power equipment, the voltage oscillation wave amplitude reaching the tested power equipment of balance maintenance is constant, always the second situation, after tested power equipment reaches the voltage oscillation wave amplitude of setting, is in free-running operation, until the voltage oscillation wave amplitude of tested power equipment is zero.
7. electric power alternating wave generator according to claim 1, it is characterized in that, the voltage that first switching device and second switch device bear is adjustable type direct current power source voltage, the electric current passed through is oscillating current, oscillating current value is relevant with the voltage oscillation wave amplitude of tested power equipment, when single switching device is difficult to bear oscillating current, first switching device and second switch device are limited to oscillating current zero crossing switching state, the mode of multiple switching device parallel connection that can adopt first switching device and second switch device improves the ability by oscillating current, there is current balance function.
8. electric power alternating wave generator according to claim 1; it is characterized in that; diode can also be accessed between adjustable type DC power anode side and the first switching device; diode forward is facing to adjustable type DC power anode side; make electric current can only from adjustable type DC power anode effluent to the first switching device, to protect adjustable type direct supply.
9. for a step-up method for the electric power alternating wave generator described in any one of claim 1 to 8, it is characterized in that, wave of oscillation boost process:
First stage is boosting oscillatory regime, tested power equipment initial voltage is zero, first switch device conductive, second switch device turn off, adjustable type direct supply charges to tested power equipment, the oscillating wave voltage at tested power equipment two ends is by sinusoidal first 1/4 periodic waveform change, oscillating current presses the change of cosine first 1/4 periodic waveform, until oscillating current is zero enter NextState;
Subordinate phase is free-running operation, when oscillating current is zero, first switching device turns off, second switch break-over of device, tested power equipment and resonant inductance form loop damping vibration, oscillating current is oppositely by sinusoidal negative half period waveform change, the oscillating wave voltage at tested power equipment two ends presses half cycles deformation before cosine, until oscillating current is zero enter NextState;
Phase III is boosting oscillatory regime, when oscillating current is zero, first switch device conductive, second switch device turn off, adjustable type direct supply charges to tested power equipment, the oscillating wave voltage at tested power equipment two ends presses the change of cosine second half waveform, oscillating current be forward by the positive half cycles deformation of sine, until oscillating current is zero enter NextState;
Repeat subordinate phase and phase III, the oscillating wave voltage amplitude at tested power equipment two ends constantly raises, until reach setting value.
10. electric power alternating wave generator according to claim 9, is characterized in that, the amplitude of adjustable type direct supply next stage is determined by the boosting amplitude of tested power equipment next stage and the resonance current of current generation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742212.7A CN104407185B (en) | 2014-12-08 | 2014-12-08 | Electric power alternating wave generator |
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|---|---|---|---|
| CN201410742212.7A CN104407185B (en) | 2014-12-08 | 2014-12-08 | Electric power alternating wave generator |
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| CN104407185A true CN104407185A (en) | 2015-03-11 |
| CN104407185B CN104407185B (en) | 2018-09-04 |
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| CN201410742212.7A Expired - Fee Related CN104407185B (en) | 2014-12-08 | 2014-12-08 | Electric power alternating wave generator |
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Cited By (6)
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| CN106018893A (en) * | 2016-05-03 | 2016-10-12 | 苏州泰思特电子科技有限公司 | Oscillatory wave high voltage generator applied to electrical test |
| CN106018894A (en) * | 2016-05-03 | 2016-10-12 | 苏州泰思特电子科技有限公司 | Damped oscillation wave voltage generator applied to electromagnetic compatibility test |
| CN110364061A (en) * | 2019-07-12 | 2019-10-22 | 上海图菱新能源科技有限公司 | Mould electricity number audio-visual education programme experimental circuit and method |
| CN111141998A (en) * | 2019-12-20 | 2020-05-12 | 国网浙江海盐县供电有限公司 | 10kV high-voltage cable alternating-current withstand voltage and partial discharge test system and method |
| CN113804931A (en) * | 2021-08-13 | 2021-12-17 | 深圳供电局有限公司 | System, method, apparatus, device and storage medium for generating oscillating wave voltage |
| CN114355007A (en) * | 2021-12-02 | 2022-04-15 | 西南交通大学 | Oil-immersed transformer deformation diagnosis method based on self-oscillation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018893A (en) * | 2016-05-03 | 2016-10-12 | 苏州泰思特电子科技有限公司 | Oscillatory wave high voltage generator applied to electrical test |
| CN106018894A (en) * | 2016-05-03 | 2016-10-12 | 苏州泰思特电子科技有限公司 | Damped oscillation wave voltage generator applied to electromagnetic compatibility test |
| CN106018894B (en) * | 2016-05-03 | 2019-01-11 | 苏州泰思特电子科技有限公司 | EMC test attenuation oscillasion impulse voltage generator |
| CN106018893B (en) * | 2016-05-03 | 2019-04-05 | 苏州泰思特电子科技有限公司 | Oscillation wave high-voltage generator for electrical test |
| CN110364061A (en) * | 2019-07-12 | 2019-10-22 | 上海图菱新能源科技有限公司 | Mould electricity number audio-visual education programme experimental circuit and method |
| CN111141998A (en) * | 2019-12-20 | 2020-05-12 | 国网浙江海盐县供电有限公司 | 10kV high-voltage cable alternating-current withstand voltage and partial discharge test system and method |
| CN113804931A (en) * | 2021-08-13 | 2021-12-17 | 深圳供电局有限公司 | System, method, apparatus, device and storage medium for generating oscillating wave voltage |
| CN114355007A (en) * | 2021-12-02 | 2022-04-15 | 西南交通大学 | Oil-immersed transformer deformation diagnosis method based on self-oscillation |
| CN114355007B (en) * | 2021-12-02 | 2022-07-26 | 西南交通大学 | Oil-immersed transformer deformation diagnosis method based on self-oscillation |
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