CN101358875B - Method for measuring capacitor noise by multi-frequency power implantation and apparatus thereof - Google Patents
Method for measuring capacitor noise by multi-frequency power implantation and apparatus thereof Download PDFInfo
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- CN101358875B CN101358875B CN2008101970654A CN200810197065A CN101358875B CN 101358875 B CN101358875 B CN 101358875B CN 2008101970654 A CN2008101970654 A CN 2008101970654A CN 200810197065 A CN200810197065 A CN 200810197065A CN 101358875 B CN101358875 B CN 101358875B
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Abstract
A method and a device adopt a multi-frequency power injection for detecting the noise of a capacitor; the method is characterized in that an independent fundamental-wave power and a plurality of harmonic power are adopted to form a multi-frequency power for making the injected fundamental-wave and each harmonic current and voltage to be in a controllable state; and the fundamental-wave and each harmonic current and voltage can be sent to an experiment transformer independently according to respective current condition of the capacitor and are loaded to a capacitor to be detected after being compounded by the transformer; two microphones transfer the noise signal of the capacitor to be detected to a noise tester for calculation and analysis and for getting noise parameters thereof. The method and the device for detecting the capacitor noise can detect the noise parameters which are mainly close to that gotten under the real operation of the capacitor, and can provide more accurate scientific data for the noise level evaluation and the noise control.
Description
Technical field
The present invention relates to a kind of method and device thereof of Measurement of capacitor noise.Particularly adopt the method and the device thereof of measuring capacitor noise by multi-frequency power implantation.
Background technology
Capacitor has become a main noise source in HVDC converter substation, particularly alternating current filter capacitor group noise is even more serious, has become the difficult point of environmental improvement.Because the generation of capacitor noise is relevant with many factors, particularly close with the harmonic relationships of injecting capacitor, make measurement and evaluation produce difficulty to capacitor noise.At present, how carrying out capacitor noise measures, both there be not unified standard, there is not unified method yet, cause the measuring method of capacitor noise multifarious like this, the power supply method for implanting is various especially, there is the single-frequency power supply to inject, there is multiple-harmonic composite wave power supply to inject, because these power supplys and the actual user mode gap of capacitor are very far away, though can record a noise level of capacitor, but be difficult to react the noise level of the actual user mode of capacitor, thereby calculating noise is qualified when causing design, and noise is to exceed standard in the actual engineering, causes bigger harm.
The electric current that flows through in the filter capacitor group of general high voltage DC converter station also has one or two main harmonic electric current except the fundamental frequency electric current, other subharmonic current is much smaller than fundamental current and main harmonic electric current.Therefore, the noise of capacitor is mainly by first-harmonic and the main harmonic function of current and produce.Adopt the single-frequency power supply to go equivalence, size that can not the effect of correct response different frequency harmonic wave.Therefore, adopt the test method of single-frequency equivalence truly to measure near the noise situations under the capacitor actual condition.
And inject synthetic harmonic source, as square wave.Though can obtain the experiment power supply of the harmonic content of wide area, the relation between first-harmonic and each harmonic is uncertain, more is difficult to test under the condition of given first-harmonic and main harmonic.Therefore, equally also can't reflect the noise level of capacitor under true service condition.
In sum, also do not have at present a kind of basic near the test method and the device that carry out noise measurement under the true ruuning situation of capacitor.
Summary of the invention
In order to address the above problem, the invention provides a kind of method and device thereof that adopts measuring capacitor noise by multi-frequency power implantation, record basic near the noise parameter under the true ruuning situation of capacitor.
Technical scheme of the present invention is: a kind of method that adopts measuring capacitor noise by multi-frequency power implantation, it is characterized in that: adopt independently first-harmonic (power frequency) power supply, with several independently the harmonic wave power supply constitute multi-frequency power, make the first-harmonic and each harmonic electric current, the voltage that inject capacitor all be in controllable state, separately according to the condenser current condition, send into testing transformer independently, be loaded on the measured capacitance device by transformer after synthetic, with microphone noise signal transmission to the noise-measuring instrument of measured capacitance device carried out computational analysis and obtain its noise parameter.
The method of aforesaid measuring capacitor noise by multi-frequency power implantation, it is characterized in that: described first-harmonic power supply and harmonic wave power supply have folk prescription to fan-out capability, promptly have only output, and can not be by the power supply of outside foldback, or common, promptly exportable again can be by the power supply of outside foldback.
The capacitor noise measurement mechanism that a kind of multi-frequency power injects, it is characterized in that: it comprises multi-frequency power and coupling transformer, by first-harmonic (power frequency) power supply independently, with several independently the harmonic wave power supply constitute multi-frequency power, multi-frequency power is by transformer winding input coupling, be loaded on the measured capacitance device, two electrodes of measured capacitance device and two electrodes of secondary coil winding of transformer are in parallel, and with microphone noise signal transmission to the noise-measuring instrument of measured capacitance device are carried out computational analysis and obtain its noise parameter.
The capacitor noise measurement mechanism that aforesaid multi-frequency power injects is characterized in that: when adopting not only exportable but also can be by the multi-frequency power of outside foldback the time, the disabler of non-supply frequency being installed at the delivery outlet of each power supply.
The capacitor noise measurement mechanism that aforesaid multi-frequency power injects is characterized in that: when adopting not only exportable but also can be by the multi-frequency power of outside foldback the time, adopting resonant tank to constitute the power channel of different frequency at the transformer secondary.
The capacitor noise measurement mechanism that aforesaid multi-frequency power injects, it is characterized in that: when adopting not only exportable but also can test by the multi-frequency power of outside foldback, in parallel by inductance with the measured capacitance device, constitute certain supply frequency, or the series resonance path of certain two supply frequency, secondary at transformer forms an impedance path, and not counter the delivering in other power supply of institute's injected frequency power supply gone.
By above-mentioned method of testing and device, adopt multi-frequency power to inject (a first-harmonic power supply and several harmonic wave power supplys), separately according to measured capacitance device current condition, send into testing transformer independently, be loaded on the measured capacitance device by transformer after synthetic, make the fundamental current and each harmonic electric current and the true running status basically identical of measured capacitance device that flow into the measured capacitance device, the noise level that makes the measured capacitance device in the test with substantially near the noise level of measured capacitance device under the practical operation situation, for noise level evaluation and improvement provide science data more accurately.
The invention has the beneficial effects as follows, use the method for this Measurement of capacitor noise can record basic near the noise parameter under the true ruuning situation of capacitor.
Description of drawings
Fig. 1 is embodiments of the invention 1, adopts each power supply to be folk prescription to sending, and can not oppositely import the enforcement measuring method synoptic diagram of power supply.
Fig. 2 is embodiments of the invention 2, adopts the enforcement measuring method synoptic diagram after power output end adds disabler.
Fig. 3 is embodiments of the invention 3, adopts on transformer secondary output coil winding limit and adopts resonant tank to constitute the enforcement measuring method synoptic diagram of the power channel of different frequency.
Fig. 4 is embodiments of the invention 4, adopts the enforcement measuring method synoptic diagram that adds disabler and adopt resonant tank to make up on transformer secondary output coil winding limit at power output end.
Embodiment
Following a tree name drawings and Examples are described in further detail the present invention.
In the accompanying drawing: 1-microphone, 2-noise-measuring instrument, T-transformer, U
F1-first-harmonic power supply, U
F2-harmonic wave power supply, C-measured capacitance device, C
1, C
2, C
3, C
11, C
22: capacitor, IC-flows into the electric current of measured capacitance device, L
1, L
2, L
3, L
4, L
5, L
6, L
11, L
22: inductor.
Referring to Fig. 1, the basic circuit schematic diagram of measuring capacitor noise by multi-frequency power implantation is by first-harmonic power supply U
F1With harmonic wave power supply U
F2Multi-frequency power that constitutes and transformer T form, two electrodes of its measured capacitance device C and two electrodes of secondary coil winding of transformer T are in parallel, multi-frequency power is by transformer T primary coil winding input coupling, be loaded on measured capacitance device C, can make the electric current I that flows into measured capacitance device C by the oscillograph monitoring
CParameter conforms to practical operation situation, and the noise signal transmission that two microphones 1 will be surveyed capacitor C is carried out computational analysis to noise-measuring instrument 2 and obtained its noise parameter.
By above-mentioned test circuit, adopt multi-frequency power to inject (first-harmonic power supply U
F1With several harmonic wave power supplys U
F2), separately according to measured capacitance device C electric current I
CCondition, send into testing transformer T independently, be loaded on measured capacitance device C by transformer T after synthetic, and make fundamental current and each harmonic electric current and the true running status basically identical of measured capacitance device C that flows into measured capacitance device C, make the noise parameter and basic noise level of the measured capacitance device C in the test near measured capacitance device C under the practical operation situation, the noise parameter that records with the measuring capacitor noise by multi-frequency power implantation method is near the noise level under the true ruuning situation like this, for noise level evaluation and improvement provide science data more accurately.
Embodiment 3 shown in Figure 3 adopts resonant tank to constitute the enforcement measuring method synoptic diagram of the power channel of different frequency at the transformer secondary.In Fig. 3, work as U
F1, U
F2Employing is exportable can be tested by the power supply of outside foldback again the time, can pass through inductance L
3Constitute certain supply frequency with test capacitors C, or the series resonance path of certain two supply frequency is (by L
4, C
3Compose in parallel), form an impedance path at the secondary of transformer T, and not counter the delivering in other power supply of institute's injected frequency power supply gone.
Embodiment 4 shown in Figure 4 is the enforcement measuring method synoptic diagram that add disabler and adopt resonant tank to make up at the transformer secondary at power output end.In Fig. 4, work as U
F1, U
F2When employing can be imported and can be tested by the power supply that outer counter is sent, can (one group by L by adding disabler
11, C
11In parallel, one group by L
22, C
22In parallel) and at transformer T secondary shunt inductance device L
5Reach series reactor L in test capacitors C loop
6Constitute the method that resonance passage combines, finish the independent injection transformer of each frequency power supply, inject test capacitors C, and each the frequency power supply that reaches injection can measure the purpose of accounting separately in the synthetic back of transformer.
Claims (6)
1. method that adopts measuring capacitor noise by multi-frequency power implantation, it is characterized in that: adopt an independently first-harmonic power supply, with several independently the harmonic wave power supply constitute multi-frequency power, make the first-harmonic and each harmonic electric current, the voltage that inject capacitor all be in controllable state, separately according to the condenser current condition, send into testing transformer independently, be loaded on the measured capacitance device by transformer after synthetic, with microphone noise signal transmission to the noise-measuring instrument of measured capacitance device carried out computational analysis and obtain its noise parameter.
2. the method for measuring capacitor noise by multi-frequency power implantation as claimed in claim 1, it is characterized in that: described first-harmonic power supply and harmonic wave power supply have folk prescription to fan-out capability, promptly has only output, and can not be by the power supply of outside foldback, or common, promptly exportable again can be by the power supply of outside foldback.
3. implement the capacitor noise measurement mechanism of the multi-frequency power injection of claim 1 or 2 methods, it is characterized in that: it comprises multi-frequency power and coupling transformer, by a first-harmonic power supply independently, with several independently the harmonic wave power supply constitute multi-frequency power, multi-frequency power is by transformer winding input coupling, be loaded on the measured capacitance device, two electrodes of measured capacitance device and two electrodes of secondary coil winding of transformer are in parallel, and with microphone noise signal transmission to the noise-measuring instrument of measured capacitance device are carried out computational analysis and obtain its noise parameter.
4. the capacitor noise measurement mechanism that multi-frequency power as claimed in claim 3 injects is characterized in that: when adopting not only exportable but also can be by the multi-frequency power of outside foldback the time, the disabler of non-supply frequency being installed at the delivery outlet of each power supply.
5. the capacitor noise measurement mechanism that multi-frequency power as claimed in claim 3 injects is characterized in that: when adopting not only exportable but also can be by the multi-frequency power of outside foldback the time, adopting resonant tank to constitute the power channel of different frequency at the transformer secondary.
6. the capacitor noise measurement mechanism that injects as claim 3 or 4 described multi-frequency powers, it is characterized in that: when adopting not only exportable but also can test by the multi-frequency power of outside foldback, in parallel by inductance with the measured capacitance device, constitute the series resonance path of certain supply frequency or certain two supply frequency, in impedance path of secondary formation of transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101970654A CN101358875B (en) | 2008-09-25 | 2008-09-25 | Method for measuring capacitor noise by multi-frequency power implantation and apparatus thereof |
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| CN2008101970654A CN101358875B (en) | 2008-09-25 | 2008-09-25 | Method for measuring capacitor noise by multi-frequency power implantation and apparatus thereof |
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| CN101358875B true CN101358875B (en) | 2010-09-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104515589B (en) * | 2013-09-27 | 2018-02-13 | 珠海格力电器股份有限公司 | The method and system of air conditioner electric device detection |
| CN104316796B (en) * | 2014-10-24 | 2017-06-13 | 国家电网公司 | A kind of high-power Harmonic Current characteristic test system and method |
| CN104345234B (en) * | 2014-10-24 | 2017-04-26 | 国网四川省电力公司电力科学研究院 | Harmonic power supply feature test system and method |
| CN104457971B (en) * | 2014-11-21 | 2018-01-19 | 西安交通大学 | A kind of frequency sweep test method for power capacitor noise prediction |
| CN106154067A (en) * | 2015-03-26 | 2016-11-23 | 中国振华（集团）新云电子元器件有限责任公司 | A kind of tantalum capacitor noise measuring system |
| CN105548733B (en) * | 2015-12-03 | 2018-05-29 | 广东欧珀移动通信有限公司 | The test method and device of noise |
| CN105974216A (en) * | 2016-05-05 | 2016-09-28 | 国网天津市电力公司 | Current injection circuit for power capacitor noise test |
| CN106970275A (en) * | 2017-04-07 | 2017-07-21 | 中国电力科学研究院 | A kind of method and system measured based on multiple frequency power sources to reactor noise |
| CN110061502A (en) * | 2019-04-24 | 2019-07-26 | 千黎（苏州）电源科技有限公司 | Multiple-harmonic injection control system and method |
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