CN103760508A - Virtual dielectric loss device and detecting method thereof - Google Patents
Virtual dielectric loss device and detecting method thereof Download PDFInfo
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- CN103760508A CN103760508A CN201310627377.5A CN201310627377A CN103760508A CN 103760508 A CN103760508 A CN 103760508A CN 201310627377 A CN201310627377 A CN 201310627377A CN 103760508 A CN103760508 A CN 103760508A
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Abstract
The invention relates to a virtual dielectric loss device and a detecting method thereof. The virtual dielectric loss device comprises a voltage proportion conversion module, a precise phase shifting module, a precise current amplifying module and a control module. The voltage proportion conversion module, the precise phase shifting module and the precise current amplifying module are connected in sequence, and the control module is respectively connected with the precise phase shifting module and the precise current amplifying module. The method comprises the steps that firstly, a high-voltage signal output from the high-voltage end of a dielectric loss tester to be detected is converted into a low-voltage signal; secondly, the converted voltage signal is processed through the phase shifting module to obtain a needed phase position; thirdly, the signal output through the phase shifting module is output to become a current signal amplified through the precise current amplifying module according to the demands; fourthly, the output current signal is input to the measuring end of the dielectric loss tester to be detected; fifthly, different dielectric loss factors are simulated through phase shifting, and different capacitances are simulated through current amplifying. The virtual dielectric loss device is fast and convenient to operate, and the dielectric loss tester is effectively detested/ corrected.
Description
Technical field
The present invention relates to a kind of power test devices and methods therefor, specifically relate to a kind of virtual medium loss device and detection method thereof.
Background technology
The state of insulation that judges capacitance type equipment in electric system is to detect dielectric dissipation factor.Decreasing insulating such as humidified insulation, insulating oil pollution and insulation ag(e)ing, all can directly cause dielectric dissipation factor to increase.When detecting dielectric dissipation factor, can obtain the data of the variation of the electric capacity of the malfunction of reflection equipment, the method of existing detection dielectric dissipation factor, generally apply 10kV trial voltage, this is the insulation status in reflection equipment when operation truly, in equipment service condition lower time that under 10kV, dielectric dissipation factor detects stand the test, has fault to occur, and the defect moreover having cannot be found by the detection of the dielectric dissipation factor under 10kV.And carry out the dissipation factor test under working voltage, and can accurately reflect the insulation status of equipment, effectively judge whether high voltage electric equipment exists defect.When having ready conditions, generally all can carry out the dissipation factor test under working voltage, such as being all defined in GB/T1208-2006 < < current transformer > > and GB/T19749-2005 < < coupling condenser and capacitive divider > >, under working voltage, carry out dielectric dissipation factor measurement.Along with constantly improving and miniaturization of frequency conversion resonance experiment device, under working voltage, dissipation factor test is moved towards transformer station from laboratory gradually.In DL/T393-2010 < < power transmission and transformation equipment state overhauling testing regulations > >, the electrical equipments such as sleeve pipe, mutual inductor and capacitor being carried out to dissipation factor test under working voltage has a detailed description.For dissipation factor test under working voltage is instructed, National Energy Board has issued dissipation factor test guide rule > > under DL/T1154-2012 < < high voltage electric equipment rated voltage.
Present stage is used for the normally dielectric dissipation factor standard of standard set-up that dielectric loss tester is detected/calibrated.Dielectric dissipation factor standard is comprised of the high voltage standard capacitor different resistance of connecting, and it is limited several that electric capacity is generally fixed as 100pF, 1nF, 5nF, 10nF, 50nF, 100nF, 500nF etc.High voltage standard capacitor and resistance series connection for the method, obtain different dielectric dissipation factors by changing resistance value.The standard weak point that this method is made is: when high voltage standard capacitor capacity is larger, capacitance value is unstable, causes the value of dielectric dissipation factor also unstable, and electric capacity value is single, and the rated voltage of standard is difficult to improve.Due to the manufacture craft of high voltage standard capacitor, along with the increase of electric capacity, stability is more and more difficult to guarantee.Adopt the method for capacitor series resistance, it is very difficult that making rated voltage 10kV, electric capacity exceed the dielectric dissipation factor standard of 10nF, and the requirement that reach the calibration of rated voltage dielectric loss tester is difficult to realize especially.
In sum, all there is significantly deficiency in traditional dielectric dissipation factor standard at present on principle of work and calibration steps, is difficult to reach the requirement that dielectric loss tester is detected/calibrated.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of virtual medium loss device and detection method thereof, for the deficiency of traditional sucrose loss factor standard device, propose and realized a kind of new dielectric dissipation factor standard set-up and detection method thereof, its core design thinking is to come by the amplitude ratio of change input voltage and output current and phase differential electric capacity and the dielectric dissipation factor of analog electrical capacitive equipment.The present invention is according to the principle of work of dielectric loss tester, simulate different electric capacitys and dielectric dissipation factor, reasonable in design, operation is convenient, trace to the source conveniently, utilizing the present invention can be that electric capacity and dielectric dissipation factor are carried out rationally detection/calibration operation efficiently to the main measurement function of dielectric loss tester.
The object of the invention is to adopt following technical proposals to realize:
A kind of virtual medium loss device, its improvements are, described device comprises voltage ratio conversion module, accurate phase shift block, precision current amplification module and control module; Described voltage ratio conversion module, accurate phase shift block and precision current amplification module are connected successively;
Described control module is connected with precision current amplification module with accurate phase shift block respectively.
Preferably, described control module comprises CPU, communication chip, DSP, coding decoder and transceiver, for executable operations person's order, long-range accurate phase shift block and precision current amplification module is controlled.
Preferably, described voltage ratio conversion module comprises 0.005 grade of accurate voltage mutual inductor of different rated voltages.
Preferably, described accurate phase shift block realizes phase shift by changing resistance, and it comprises mica capacitor and high-accuracy resistance.
Preferably, described precision current amplification module comprises VI translation circuit and precision current amplifier.
The present invention is based on a kind of virtual medium loss detection method that another object provides, its improvements are, described method comprises:
(1) transfer the high voltage signal of tested dielectric loss tester high-pressure side output to low voltage signal;
(2) voltage signal after conversion is obtained to desired phase by phase shift block;
(3) phase shift block output signal is exported to the current signal after amplifying as required by precision current amplification module;
(4) output current signal is inputted to the measuring junction of tested dielectric loss tester;
(5) by phase shift, simulate different dielectric dissipation factors, by electric current, amplify the different electric capacity of simulation.
Preferably, described step (1) comprises that first the voltage that tested dielectric loss tester applies enter voltage ratio conversion module, transfers high voltage signal to low-voltage signal.
Preferably, described tested dielectric loss tester comprises that rated voltage is the dielectric loss tester of 10kV, 35kV and 110kV.
Preferably, described step (5) comprises that control module is long-range accurate phase shift block and precision current amplification module is carried out to the different dielectric dissipation factor of control simulation and electric capacity.
Preferably, the output current of described precision current amplification module can regulate by demand with the voltage magnitude ratio and the phase differential that are applied on voltage ratio conversion module, can simulate the various electric capacitys of 100pF～1uF and 0～0.1 various dielectric dissipation factors.
Compared with the prior art, beneficial effect of the present invention is:
The present invention is based on virtual method and simulate electric capacity and the dielectric dissipation factor of capacitive electric equipment, stable performance, simple operation, can effectively carry out the detection/calibration operation to dielectric loss tester, is conducive to solve a calibration difficult problem for different rated voltage dielectric loss testers.
The present invention is based on that virtual method is carried out analog electrical capacity and dielectric dissipation factor is carried out verification to dielectric loss tester, trial voltage can reach 110kV or above voltage, simulation maximum capacitance can exceed 500nF, the dielectric dissipation factor standard that ultra-traditional real object method far away is made, can meet the various rated voltages that occur on market and exceed 10kV dielectric loss tester verification test demand, and stable performance, simple operation.
Accompanying drawing explanation
Fig. 1 is a kind of virtual medium loss device of the present invention and detection method process flow diagram thereof.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
A kind of virtual medium loss of the present invention device.Mainly comprise voltage ratio conversion module, accurate phase shift block, precision current amplification module, control module.
Wherein, tested dielectric loss tester connects voltage ratio conversion module, accurate phase shift block, precision current amplification module, control module is connected with precision current amplification module with accurate phase shift block respectively, for controlling accurate phase shift block and precision current amplification module.
First the voltage that tested dielectric loss tester applies enter voltage ratio conversion module, the voltage signal transforming by voltage ratio conversion module enters accurate phase shift block, accurate phase shift block is converted into current signal by voltage signal, the output current of precision current amplification module carries out the measuring junction of tested dielectric loss tester, by changing amplitude ratio and the phase differential of input voltage signal and output current signal, obtain different electric capacitys and dielectric dissipation factor.
A kind of virtual medium loss of the present invention detection method idiographic flow is:
1, first the voltage that tested dielectric loss tester applies enter voltage ratio conversion module, transfers high voltage signal to low-voltage signal.By selecting the suitable voltage ratio conversion module can be for the dielectric loss tester of rated voltage 10kV, 35kV, 110kV and other value, technology portable be to the dielectric loss tester standard set-up of different electric pressures.
2, the voltage signal transforming by voltage ratio conversion module enters accurate phase shift block, and voltage signal after conversion is obtained to desired phase by phase shift block;
3, phase shift block output signal is exported the current signal after amplifying as required by precision current amplification module;
4, output current signal is inputted to the measuring junction of tested dielectric loss tester;
5, by phase shift block, carry out accurate phase shift, simulate different dielectric dissipation factors, and amplify the different electric capacity of simulation by electric current.
Wherein, voltage ratio conversion module comprises 0.005 grade of accurate voltage mutual inductor of different rated voltages, can select according to tested dielectric loss tester output voltage grade.
Wherein, accurate phase shift block is mainly comprised of mica capacitor and high-accuracy resistance, by changing resistance, realize phase shift, be specially: the T-shaped circuit being formed by 0.01 grade of precision metallic film resistance of band shielding three terminal capacitor, 1 grade of mica capacitor and resistance value scope 100 Ω～1M Ω.Three terminal capacitor electric capacity can be selected 1 μ F and 10nF, and mica capacitor capacity is 10nF.
Wherein, precision current amplification module is mainly comprised of VI translation circuit and precision current amplifier, and wherein VI translation circuit is realized based on instrumentation amplifier INA128.
Wherein, control module consists of keyboard, CPU, communication chip, DSP, coding decoder and transceiver, is specially the compositions such as C8051 single-chip microcomputer, infrared remote receiver AT156A, infrared encoder UPD6121G.For executable operations person's order, control module is carried out the current amplification factor of the accurate phase shift block phase shift angle of keyboard instruction Long-distance Control and electric current amplification module.Different dielectric dissipation factor corresponding to phase shift angle, the final corresponding different electric capacitys of different current amplification factors.
Wherein, the output current of precision current amplification module can regulate by demand with the voltage magnitude ratio and the phase differential that are applied on voltage ratio conversion module, can simulate the various electric capacitys of 100pF～1uF and 0～0.1 various dielectric dissipation factors.
Embodiment
If the trial voltage of dielectric loss tester is U, virtual medium loss standard device output current is I, the phase differential θ of U and I, and the electric capacity of simulation is C, the dielectric dissipation factor of simulation is D:
D＝tg(90°-θ)
Therefore, by the value that changes I and θ, just can obtain different electric capacitys and dielectric dissipation factor, thereby reach the object that dielectric loss tester is calibrated.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a virtual medium loss device, is characterized in that, described device comprises voltage ratio conversion module, accurate phase shift block, precision current amplification module and control module; Described voltage ratio conversion module, accurate phase shift block and precision current amplification module are connected successively;
Described control module is connected with precision current amplification module with accurate phase shift block respectively.
2. a kind of virtual medium loss device as claimed in claim 1, it is characterized in that, described control module comprises CPU, communication chip, DSP, coding decoder and transceiver, for executable operations person's order, long-range accurate phase shift block and precision current amplification module is controlled.
3. a kind of virtual medium loss device as claimed in claim 1, is characterized in that, described voltage ratio conversion module comprises 0.005 grade of accurate voltage mutual inductor of different rated voltages.
4. a kind of virtual medium loss device as claimed in claim 1, is characterized in that, described accurate phase shift block realizes phase shift by changing resistance, and it comprises mica capacitor and high-accuracy resistance.
5. a kind of virtual medium loss device as claimed in claim 1, is characterized in that, described precision current amplification module comprises VI translation circuit and precision current amplifier.
6. a virtual medium loss detection method, is characterized in that, described method comprises:
(1) transfer the high voltage signal of tested dielectric loss tester high-pressure side output to low voltage signal;
(2) voltage signal after conversion is obtained to desired phase by phase shift block;
(3) phase shift block output signal is exported to the current signal after amplifying as required by precision current amplification module;
(4) output current signal is inputted to the measuring junction of tested dielectric loss tester;
(5) by phase shift, simulate different dielectric dissipation factors, by electric current, amplify the different electric capacity of simulation.
7. a kind of virtual medium loss detection method as claimed in claim 6, is characterized in that, described step (1) comprises that first the voltage that tested dielectric loss tester applies enter voltage ratio conversion module, transfers high voltage signal to low-voltage signal.
8. a kind of virtual medium loss detection method as claimed in claim 6, is characterized in that, described tested dielectric loss tester comprises that rated voltage is the dielectric loss tester of 10kV, 35kV and 110kV.
9. a kind of virtual medium loss detection method as claimed in claim 6, is characterized in that, described step (5) comprises that control module is long-range accurate phase shift block and precision current amplification module are carried out to the different dielectric dissipation factor of control simulation and electric capacity.
10. a kind of virtual medium loss detection method as claimed in claim 6, it is characterized in that, the output current of described precision current amplification module can regulate by demand with the voltage magnitude ratio and the phase differential that are applied on voltage ratio conversion module, can simulate the various electric capacitys of 100pF～1uF and 0～0.1 various dielectric dissipation factors.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104345293A (en) * | 2014-11-21 | 2015-02-11 | 国家电网公司 | Medium virtual device for standard calibration of dielectric loss factor of high-voltage capacitor |
| CN105319448A (en) * | 2015-11-13 | 2016-02-10 | 广州供电局有限公司 | A system and a method for simulating the dielectric loss of capacitive apparatuses in a high voltage environment |
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| CN102435973A (en) * | 2011-11-29 | 2012-05-02 | 国网电力科学研究院 | Calibration apparatus of capacitive equipment insulation on-line monitoring system and method thereof |
| CN102736049A (en) * | 2011-11-25 | 2012-10-17 | 中国电力科学研究院 | Wireless-remote-control simulated dielectric loss device |
| CN103383443A (en) * | 2013-07-31 | 2013-11-06 | 上海仪器仪表研究所 | Modularized three-phase instrument calibrating device for smart grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007051943A (en) * | 2005-08-18 | 2007-03-01 | Mazda Motor Corp | Apparatus for detecting abnormality of current sensor |
| CN101382588A (en) * | 2008-09-22 | 2009-03-11 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN102736049A (en) * | 2011-11-25 | 2012-10-17 | 中国电力科学研究院 | Wireless-remote-control simulated dielectric loss device |
| CN102435973A (en) * | 2011-11-29 | 2012-05-02 | 国网电力科学研究院 | Calibration apparatus of capacitive equipment insulation on-line monitoring system and method thereof |
| CN103383443A (en) * | 2013-07-31 | 2013-11-06 | 上海仪器仪表研究所 | Modularized three-phase instrument calibrating device for smart grid |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104345293A (en) * | 2014-11-21 | 2015-02-11 | 国家电网公司 | Medium virtual device for standard calibration of dielectric loss factor of high-voltage capacitor |
| CN104345293B (en) * | 2014-11-21 | 2016-06-29 | 国家电网公司 | A kind of medium virtual bench for high voltage capacitor dielectric loss factor standard correction |
| CN105319448A (en) * | 2015-11-13 | 2016-02-10 | 广州供电局有限公司 | A system and a method for simulating the dielectric loss of capacitive apparatuses in a high voltage environment |
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