CN204177920U - Attenuation oscillasion impulse high-voltage power supply is put without office based on low pressure phased switch - Google Patents
Attenuation oscillasion impulse high-voltage power supply is put without office based on low pressure phased switch Download PDFInfo
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- CN204177920U CN204177920U CN201420658745.2U CN201420658745U CN204177920U CN 204177920 U CN204177920 U CN 204177920U CN 201420658745 U CN201420658745 U CN 201420658745U CN 204177920 U CN204177920 U CN 204177920U
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Abstract
The utility model relates to one and puts attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, comprise the low-voltage AC for the three-phase electricity of input to be exported variable ratio frequency changer pressure-adjustable through variable-frequency power sources, variable-frequency power sources connects phased two-way switch, phased switch controls the alternating voltage exporting exciting transformer to, alternating current source is used for series resonance through exciting transformer and powers, series resonant circuit comprises high-pressure hollow resonance reactor and high-voltage load electric capacity, the high pressure exported connects high-tension measurement unit, high-tension measurement unit is by a high voltage non-local discharge coupling capacitance voltage divider, high voltage non-local discharge coupling capacitance voltage divider is for measuring high tension voltage and sampling Partial discharge signal.The application of low pressure phased switch of the present utility model improves the reliability and security of wave of oscillation high-voltage power supply.
Description
Technical field
This use new patent relates to a kind of high-pressure test device of power cable, and particularly one puts attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, belongs to High-Voltage Experimentation Technology field.
Background technology
Domestic high-tension cable test present stage all adopts withstand voltage test to check the quality of cable, and after 2000, cable AC voltage withstand test is carried out gradually at home.In AC voltage withstand test, if adopt low withstand voltage test, the quality problems of cable cannot be checked out, may break down when cable energising runs; Government test specification adopts the magnitude of voltage and prolongation pressure-resistant time that improve withstand voltage test, can solve the problems referred to above above.But withstand voltage test itself is a kind of destructive test, improves withstand voltage value and extend the service life reduction that pressure-resistant time all can make high-tension cable.
Adopt attenuation oscillasion impulse local discharge test can reduce the magnitude of voltage of cable voltage test in cable testing, reduce withstand voltage time expand, have can replace former AC voltage withstand test, destructive lower, again can analyzing and positioning fault and can the superiority in estimation device serviceable life.Now local discharge test has the application of wider model in the power equipments such as high pressure main-transformer both at home and abroad, adopt at high-tension cable that local discharge test is domestic has entered substantive research, common sinusoidal wave equally high because of each wave head without office's discharge source, localization of fault cannot be completed, what put that attenuation oscillasion impulse test utilizes its waveform with office returns to the accurate positioning cable trouble spot of wave energy, need so eager a kind of reliable can be applicable to site test put attenuation oscillasion impulse power supply without office.
The scheme that attenuation oscillasion impulse high-voltage power supply generally all adopts DC charging and high-voltage switch gear to combine is put without office, the highly reliable difference of high-voltage switch gear cost of this scheme, technical threshold is high, the more difficult realization of high voltage electronic switch of tens kilovolts and hundreds of kilovolt, cost is quite high, is comparatively difficult to the popularization in test industry, what also have application series resonance puts wave of oscillation high-voltage power supply without office, but the scheme generally all adopting short circuit excitation to become, the short circuiting switch of this scheme and variable-frequency power sources and fragile, because variable-frequency power sources and short circuiting switch are often by heavy current impact, often work in the limit of variable-frequency power sources and short circuiting switch, therefore failure rate is higher, may not by what promote, low pressure phased switch is put attenuation oscillasion impulse high-voltage power supply without office and is successfully avoided the problems referred to above, carry out local discharge test for high voltage power cable scene and realize possibility, for the high-potting of power cable brings revolutionary variation, also the high-potting in other power equipment can be expanded further, therefore its economic benefit and social benefit obvious.
Summary of the invention
The present invention seeks to provide one to put attenuation oscillasion impulse power supply without office to overcome the deficiencies in the prior art, this power supply is used for the novel AC voltage withstand test of cable, have can replace former AC voltage withstand test, destructiveness lower, again can analyzing and positioning fault and can the superiority in estimation device serviceable life.
For achieving the above object, the technical solution used in the present invention is: put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it comprises the low-voltage AC for the three-phase electricity of input to be exported variable ratio frequency changer pressure-adjustable through variable-frequency power sources, variable-frequency power sources connects phased two-way switch, phased switch controls the alternating voltage exporting exciting transformer to, alternating current source is used for series resonance through exciting transformer and powers, series resonant circuit comprises high-pressure hollow resonance reactor and high-voltage load electric capacity, the high pressure exported connects high-tension measurement unit, high-tension measurement unit is by a high voltage non-local discharge coupling capacitance voltage divider, high voltage non-local discharge coupling capacitance voltage divider is for measuring high tension voltage and sampling Partial discharge signal.
Optimally, describedly put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it is characterized in that: sinusoidal wave high pressure zero crossing can be detected, and according to high voltage frequency, calculate the time to peak point of high pressure, on this time point, low pressure phased switch directly disconnects variable-frequency power sources output, makes to be in damped oscillation on output high-pressure peak.
Optimally, described puts attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it is characterized in that: described series resonance reactor adopts unsaturated multilayer cake formula air reactor, this reactor needs reactance value according to resonance, adopt many cakes tandem compound, the frequency operating range of the effective wave of oscillation power supply improved.
Optimally, described puts attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it is characterized in that: described high-tension measurement unit adopts high voltage measuring and office high-volume to measure a shared high-voltage capacitance, form tandem office and put detection impedance and Transmission System for High Voltage Measurements, the low-voltage arm of high_voltage isolation measuring system puts detection impedance earth by office, high-pressure sampling circuit adopts virtually, and detection and high-tension measurement are put in the office of incorporating.
Owing to adopting technique scheme, beneficial effect of the present invention: low pressure phased switch puts the success of attenuation oscillasion impulse high-voltage power supply without office, carry out local discharge test for high voltage power cable scene and realize possibility, for the high-potting of power cable brings revolutionary variation, also can expand the high-potting in other power equipment further, therefore its economic benefit and social benefit obvious.
Accompanying drawing explanation
Accompanying drawing 1 puts attenuation oscillasion impulse high-voltage power supply technical scheme block diagram for the present invention is based on low pressure phased switch without office;
Accompanying drawing 2 puts attenuation oscillasion impulse high-voltage power supply theory diagram for the present invention is based on low pressure phased switch without office;
Accompanying drawing 3 for the present invention be high-pressure peak adjustable attenuation waveform schematic diagram;
Embodiment
Be described in detail below in conjunction with accompanying drawing 1 pair of embodiment of the present invention:
Kind as shown in Figure 1 puts the technical scheme of attenuation oscillasion impulse high-voltage power supply without office based on low pressure phased switch, comprise the low-voltage AC for the three-phase electricity of input to be exported variable ratio frequency changer pressure-adjustable through variable-frequency power sources 1, described variable-frequency power sources connects phased two-way switch 2, described phased switch controls the alternating voltage exporting exciting transformer 3 to, alternating current source is used for series resonance through described exciting transformer and powers, series resonant circuit comprises high-pressure hollow resonance reactor 4 and high-voltage load electric capacity 5, the high pressure exported connects high-tension measurement unit 6, described high-tension measurement unit is by a high voltage non-local discharge coupling capacitance voltage divider 7, described high voltage non-local discharge coupling capacitance voltage divider is for measuring high tension voltage and sampling Partial discharge signal.
Be described in detail below in conjunction with accompanying drawing 2 pairs of embodiment of the present invention:
Kind as shown in Figure 2 puts the schematic diagram of attenuation oscillasion impulse high-voltage power supply without office based on low pressure phased switch, it comprises current rectifying and wave filtering circuit 1 connected successively, adjusts wide inverter power circuit 2, wave filter 3, low pressure phased switch assembly 4, exciting transformer 5, high voltage non-local coupling capacitance voltage divider 6, high pressure resonance reactor 7.The three-phase electricity access current rectifying and wave filtering circuit 1 wherein inputted exports direct current, the output of described current rectifying and wave filtering circuit 1 connects output pulse width modulation signal with the wide inverter power circuit 2 of tune, through sine wave output AC signal, the low-voltage variable frequency AC signal that described tunable filter 3 exports by low pressure phased switch assembly 4 for high pressure resonant tank is powered.
The high pressure winding of exciting transformer 5 and high pressure resonance reactor 7 and load capacitance form high-pressure series resonant tank, and high voltage non-local coupling capacitance voltage divider 6 is in parallel with described load capacitance participates in series resonance.
The low-voltage capacitance of described high voltage non-local coupling capacitance voltage divider 6 connects isolation detection circuit 62 and is connected, sample as high voltage, described isolation detection circuit 62 is by high tension voltage amplitude, phase place and frequency processing, processing signals is delivered to measurement gauge outfit 64 through opto-electronic conversion 63 and is shown real-time high tension voltage value, the phase place of high tension voltage delivers to low pressure phased switch assembly 4 through described opto-electronic conversion 63, described low pressure phased switch assembly 4 according to voltage over zero calculating voltage peak point control phase switch, thus realizes the peak atenuation of the wave of oscillation; An office of connect between the low-voltage capacitance lower end of high voltage non-local coupling capacitance voltage divider 6 with the earth puts and detects impedance 61, and described office puts detection impedance 61 and the high voltage Partial discharge signal of sampling is delivered to corresponding office puts analyzing and positioning device, formation high-pressure detection unit.
Fig. 3 is high-pressure peak adjustable attenuation waveform schematic diagram.Described low pressure phased switch assembly 4 front end and the feeder ear of series resonance are connected, the low pressure end of rear end and described exciting transformer 5 is connected, described low pressure phased switch assembly 4 is full on-state time flat, when boosting to trial voltage and high pressure attenuation oscillasion impulse need being produced, according to voltage zero-cross check point, the voltage peak point of 1/4 week after date is phaseswitch cut-off point, the high pressure resonance reactor and the load capacitance that disconnect circuit after phaseswitch continue discharge and recharge, under having reactor internal resistance and other loss without power supply, produce attenuation oscillasion impulse.
The one implemented the present invention is above put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office and is explained and illustrate, before it can complete putting into operation of 220kV and following power cable easily and efficiently and overhaul safeguard before office put withstand voltage test.The present invention will be put detection system in office and will be combined with positioning software, in conjunction with after system can search the trouble spot and defect that there are failure cable more efficiently.The present invention has significant technical progress should be able to bring considerable economic benefit.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to allow the personage being familiar with this art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; the equivalence change that all Spirit Essences according to the present invention are done or modification, all should be encompassed in protection scope of the present invention.
Claims (3)
1. put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it comprises the low-voltage AC for the three-phase electricity of input to be exported variable ratio frequency changer pressure-adjustable through variable-frequency power sources, variable-frequency power sources connects phased two-way switch, phased switch controls the alternating voltage exporting exciting transformer to, alternating current source is used for series resonance through exciting transformer and powers, series resonant circuit comprises high-pressure hollow resonance reactor and high-voltage load electric capacity, the high pressure exported connects high-tension measurement unit, high-tension measurement unit is by a high voltage non-local discharge coupling capacitance voltage divider, high voltage non-local discharge coupling capacitance voltage divider is for measuring high tension voltage and sampling Partial discharge signal.
2. put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office according to claim 1, it is characterized in that: sinusoidal wave high pressure zero crossing can be detected, and according to high voltage frequency, calculate the time to peak point of high pressure, on this time point, low pressure phased switch directly disconnects variable-frequency power sources output, makes to be in damped oscillation on output high-pressure peak.
3. according to claim 1ly put attenuation oscillasion impulse high-voltage power supply based on low pressure phased switch without office, it is characterized in that: described high-tension measurement unit adopts high voltage measuring and office high-volume to measure a shared high-voltage capacitance, form tandem office and put detection impedance and Transmission System for High Voltage Measurements, the low-voltage arm of high_voltage isolation measuring system puts detection impedance earth by office, high-pressure sampling circuit adopts virtually, and detection and high-tension measurement are put in the office of incorporating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658745.2U CN204177920U (en) | 2014-11-07 | 2014-11-07 | Attenuation oscillasion impulse high-voltage power supply is put without office based on low pressure phased switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658745.2U CN204177920U (en) | 2014-11-07 | 2014-11-07 | Attenuation oscillasion impulse high-voltage power supply is put without office based on low pressure phased switch |
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| CN204177920U true CN204177920U (en) | 2015-02-25 |
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| CN201420658745.2U Expired - Fee Related CN204177920U (en) | 2014-11-07 | 2014-11-07 | Attenuation oscillasion impulse high-voltage power supply is put without office based on low pressure phased switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345255A (en) * | 2014-11-07 | 2015-02-11 | 苏州科技学院 | Non-partial discharge damped oscillatory wave high voltage power supply based on low voltage phase-controlled switch |
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2014
- 2014-11-07 CN CN201420658745.2U patent/CN204177920U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345255A (en) * | 2014-11-07 | 2015-02-11 | 苏州科技学院 | Non-partial discharge damped oscillatory wave high voltage power supply based on low voltage phase-controlled switch |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150225 Termination date: 20171107 |