CN103760508B - A kind of virtual medium loss device and detection method thereof - Google Patents
A kind of virtual medium loss device and detection method thereof Download PDFInfo
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- CN103760508B CN103760508B CN201310627377.5A CN201310627377A CN103760508B CN 103760508 B CN103760508 B CN 103760508B CN 201310627377 A CN201310627377 A CN 201310627377A CN 103760508 B CN103760508 B CN 103760508B
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000010363 phase shift Effects 0.000 claims abstract description 41
- 230000003321 amplification Effects 0.000 claims abstract description 30
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
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- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 15
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 claims description 3
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Abstract
The present invention relates to a kind of virtual medium loss device and detection method thereof, device includes 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 sequentially connected with；Described control module is connected with accurate phase shift block and precision current amplification module respectively.Method includes: (1) transfers the high voltage signal that tested dielectric loss tester high-pressure side exports to low voltage signal；(2) voltage signal after conversion is obtained desired phase by phase shift block；(3) phase shift block output signal is exported the current signal after on-demand amplification by precision current amplification module；(4) output current signal is inputted the measurement end of tested dielectric loss tester；(5) simulate different dielectric dissipation factors by phase shift, simulate different capacitances by Current amplifier.Simple operation of the present invention, effectively carries out dielectric loss tester detection/calibration operation.
Description
Technical field
The present invention relates to a kind of power test devices and methods therefor, a kind of virtual medium loss device and inspection thereof
Survey method.
Background technology
Judge that the state of insulation of capacitance type equipment is detection dielectric dissipation factor in power system.Such as humidified insulation, insulation
The decreasing insulating such as greasy dirt dye and insulation ag(e)ing, all can directly result in dielectric dissipation factor and increase.Detection dielectric loss
The data of the change of the capacitance of the malfunction of reflection equipment, existing detection dielectric dissipation factor can be obtained while factor
Method, general apply 10kV test voltage, this can not truly reflect insulation status when equipment runs, Jie under 10kV
Faulty generation time under the equipment service condition of matter loss factor detection pass the test, the defect moreover having cannot be passed through
The detection of the dielectric dissipation factor under 10kV finds.And carry out the dissipation factor test under working voltage, can be accurate
Really reflect the insulation status of equipment, effectively judge high voltage electric equipment whether existing defects.The most all can enter when having ready conditions
Dissipation factor test under row working voltage, such as GB/T1208-2006 " current transformer " and GB/T
19749-2005 " coupling capacitor and capacitive divider " specifies to carry out Dielectric Posts under working voltage.
Along with constantly improving and miniaturization of frequency conversion resonance experiment device, under working voltage, dissipation factor test is gradually from experiment
Transformer station is moved towards in room.To sleeve pipe, transformer and electricity in DL/T393-2010 " power transmission and transformation equipment state overhauling testing regulations "
The electrical equipments such as container carry out dissipation factor test under working voltage and have a detailed description.In order to medium under working voltage
Dissipation factor test instructs, and National Energy Board has issued DL/T1154-2012 " under high voltage electric equipment rated voltage
Dissipation factor test directive/guide ".
Present stage is typically dielectric dissipation factor standard for the standard set-up detecting dielectric loss tester/calibrate
Device.Dielectric dissipation factor standard is made up of high voltage standard capacitor different resistance of connecting, and capacitance is typically fixed as
100pF, 1nF, 5nF, 10nF, 50nF, 100nF, 500nF etc. are limited several.The method high voltage standard capacitor
And resistant series, obtain different dielectric dissipation factors by changing resistance value.The standard deficiency that this method makes
Place is: when high voltage standard capacitor capacity is bigger, and capacitance value is unstable, and the value causing dielectric dissipation factor is the most unstable
Fixed, capacitance value is single, and the rated voltage of standard is difficult to improve.Due to the processing technology of high voltage standard capacitor,
Along with the increase of capacitance, stability is increasingly difficult to ensure that.The method using capacitor series resistance, makes specified electricity
Pressure 10kV, the capacitance dielectric dissipation factor standard more than 10nF is extremely difficult, rated voltage dielectric loss to be reached
The requirement of tester calibration is difficult to especially.
In sum, the most traditional dielectric dissipation factor standard all exists significantly in operation principle and calibration steps
Not enough, it is difficult to reach the requirement that dielectric loss tester is detected/calibrates.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of virtual medium loss device and detection method thereof, for tradition
The deficiency of dielectric dissipation factor standard, proposes and achieves a kind of new dielectric dissipation factor standard set-up and detection side thereof
Method, its core design thinking is to carry out artificial capacitor type by the Amplitude Ration and phase contrast changing input voltage with export electric current
The capacitance of equipment and dielectric dissipation factor.The present invention is according to the operation principle of dielectric loss tester, simulation difference electric capacity
Amount and dielectric dissipation factor, reasonable in design, operation is convenient, traces to the source conveniently, utilizes the present invention can test dielectric loss
The main i.e. capacitance of measurement function of instrument and dielectric dissipation factor carry out the most efficient detection/calibration operation.
It is an object of the invention to use following technical proposals to realize:
A kind of virtual medium is lost device, and it thes improvement is that, described device includes voltage ratio conversion module, precision
Phase shift block, precision current amplification module and control module；Described voltage ratio conversion module, accurate phase shift block and essence
Close Current amplifier module is sequentially connected with；
Described control module is connected with accurate phase shift block and precision current amplification module respectively.
Preferably, described control module includes CPU, communication chip, DSP, coding decoder and transceiver, is used for holding
The order of row operator, is remotely controlled accurate phase shift block and precision current amplification module.
Preferably, described voltage ratio conversion module includes 0.005 grade of accurate voltage mutual inductor of different rated voltage.
Preferably, described accurate phase shift block realizes phase shift by changing resistance, and it includes mica capacitor and high-accuracy
Resistance.
Preferably, described precision current amplification module includes VI translation circuit and precision current amplifier.
A kind of virtual medium that the present invention provides based on another object is lost detection method, and it thes improvement is that, described side
Method includes:
(1) high voltage signal that tested dielectric loss tester high-pressure side exports is transferred to low voltage signal；
(2) voltage signal after conversion is obtained desired phase by phase shift block；
(3) phase shift block output signal is exported the current signal after on-demand amplification by precision current amplification module；
(4) output current signal is inputted the measurement end of tested dielectric loss tester；
(5) simulate different dielectric dissipation factors by phase shift, simulate different capacitances by Current amplifier.
Preferably, described step (1) includes that the voltage that tested dielectric loss tester applies initially enters voltage ratio and becomes
Die change block, transfers high voltage signal to low-voltage signal.
Preferably, described tested dielectric loss tester includes that the medium that rated voltage is 10kV, 35kV and 110kV damages
Consumption tester.
Preferably, described step (5) includes that accurate phase shift block and precision current amplification module are remotely entered by control module
Row controls to simulate different dielectric dissipation factors and capacitance.
Preferably, the output electric current and the voltage amplitude being applied on voltage ratio conversion module of described precision current amplification module
Value can be regulated by demand than with phase contrast, can simulate the various capacitances of 100pF～1uF and the various media of 0～0.1
Loss factor.
Compared with the prior art, the invention have the benefit that
The present invention simulates capacitance and the dielectric dissipation factor of capacitive electric equipment based on virtual method, stable performance,
Simple operation, can effectively carry out the detection/calibration operation to dielectric loss tester, advantageously accounts for different rated voltage
A calibration difficult problem for dielectric loss tester.
The present invention carrys out artificial capacitor amount based on virtual method and dielectric loss tester is verified by dielectric dissipation factor, test
Voltage can reach 110kV or above voltage, and simulation maximum capacitance can be more than 500nF, remote ultra-traditional material object legal system
The dielectric dissipation factor standard made, can meet the various rated voltages occurred on market and survey more than 10kV dielectric loss
Examination instrument verification test demand, and stable performance, simple operation.
Accompanying drawing explanation
Fig. 1 is one virtual medium of the present invention loss device and detection method flow chart thereof.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
One virtual medium of the present invention loss device.Mainly include voltage ratio conversion module, accurate phase shift block, precision
Current amplifier 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 accurate phase shift block and precision current amplification module respectively, is used for controlling accurate phase shift mould
Block and precision current amplification module.
The voltage that tested dielectric loss tester applies initially enters voltage ratio conversion module, converts mould by voltage ratio
The accurate phase shift block of voltage signal entrance that block is transformed, voltage signal is converted into current signal by accurate phase shift block, essence
The output electric current of close Current amplifier module carries out the measurement end of tested dielectric loss tester, by changing input voltage signal
Amplitude Ration and phase contrast with output current signal, it is thus achieved that different capacitances and dielectric dissipation factor.
One virtual medium of the present invention loss detection method idiographic flow is:
1, the voltage that tested dielectric loss tester applies initially enters voltage ratio conversion module, is turned by high voltage signal
For low-voltage signal.By selecting suitable voltage ratio conversion module to may be used for rated voltage 10kV, 35kV, 110kV
And the dielectric loss tester of other value, technology may migrate to the dielectric loss tester standard dress of different electric pressure
Put.
2, accurate phase shift block is entered by the voltage signal that voltage ratio conversion module is transformed, voltage letter after converting
Number obtain desired phase by phase shift block；
3, phase shift block output signal exports the current signal after on-demand amplification by precision current amplification module；
4, output current signal is inputted the measurement end of tested dielectric loss tester；
5, carry out accurate phase shift by phase shift block, simulate different dielectric dissipation factors, and by Current amplifier mould
Intend different capacitances.
Wherein, voltage ratio conversion module includes 0.005 grade of accurate voltage mutual inductor of different rated voltage, can basis
Tested dielectric loss tester output voltage grade selects.
Wherein, accurate phase shift block is mainly made up of mica capacitor and high-accuracy resistance, realizes moving by changing resistance
Phase, particularly as follows: shielded 0.01 grade of essence of three terminal capacitor, 1 grade of mica capacitor and resistance value scope 100 Ω～1M Ω by band
The T-shaped circuit of close metalfilmresistor composition.Three terminal capacitor capacitance may select 1 μ F and 10nF, and mica capacitor capacity is
10nF。
Wherein, precision current amplification module is mainly made up of VI translation circuit and precision current amplifier, wherein VI conversion
Circuit realizes based on instrumentation amplifier INA128.
Wherein, control module is made up of keyboard, CPU, communication chip, DSP, coding decoder and transceiver, specifically
Form for C8051 single-chip microcomputer, infrared remote receiver AT156A, infrared encoder UPD6121G etc..For performing operator
Order, control module performs keyboard instruction and remotely controls accurate phase shift block phase shift angle and the electric current of Current amplifier module
Amplification.The corresponding different dielectric dissipation factor of different phase shift angles, different current amplification factors finally correspondence is not
Same capacitance.
Wherein, the output electric current of precision current amplification module and the voltage magnitude that is applied on voltage ratio conversion module than and
Phase contrast can be regulated by demand, can simulate the various capacitances of 100pF～1uF and the various dielectric losses of 0～0.1
Factor.
Embodiment
If the test voltage of dielectric loss tester is U, virtual medium loss standard device output electric current is I, U and I
Phase difference θ, the capacitance of simulation is C, and the dielectric dissipation factor of simulation is D, then:
D=tg (90 ° of-θ)
Therefore, just can obtain different capacitances and dielectric dissipation factor by the value changing I and θ, thus reach Jie
Matter loss test instrument carries out the purpose calibrated.
Finally should be noted that: above example only in order to illustrate that technical scheme is not intended to limit, although
Being described in detail the present invention with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still
The detailed description of the invention of the present invention can be modified or equivalent, and appointing without departing from spirit and scope of the invention
What amendment or equivalent, it all should be contained in the middle of scope of the presently claimed invention.
Claims (6)
1. a virtual medium loss device, it is characterised in that described device includes voltage ratio conversion module, precision
Phase shift block, precision current amplification module and control module；Described voltage ratio conversion module, accurate phase shift block and essence
Close Current amplifier module is sequentially connected with；
Described control module is connected with accurate phase shift block and precision current amplification module respectively；
Described control module includes CPU, communication chip, DSP, coding decoder and transceiver, is used for performing operator
Order, remotely accurate phase shift block and precision current amplification module are controlled；
Described voltage ratio conversion module includes 0.005 grade of accurate voltage mutual inductor of different rated voltage；
Described accurate phase shift block realizes phase shift by changing resistance, and it includes mica capacitor and high-accuracy resistance；
Described precision current amplification module includes VI translation circuit and precision current amplifier.
2. a virtual medium loss detection method, it is characterised in that described method comprises the steps:
(1) high voltage signal that tested dielectric loss tester high-pressure side exports is transferred to low voltage signal；
(2) voltage signal after conversion is obtained desired phase by phase shift block；
(3) phase shift block output signal is exported the current signal after on-demand amplification by precision current amplification module；
(4) output current signal is inputted the measurement end of tested dielectric loss tester；
(5) simulate different dielectric dissipation factors by phase shift, simulate different capacitances by Current amplifier.
3. a kind of virtual medium loss detection method as claimed in claim 2, it is characterised in that described step (1)
The voltage applied including tested dielectric loss tester initially enters voltage ratio conversion module, is transferred to by high voltage signal low
Pressure signal.
4. a kind of virtual medium loss detection method as claimed in claim 2, it is characterised in that described tested medium
Loss test instrument includes the dielectric loss tester that rated voltage is 10kV, 35kV and 110kV.
5. a kind of virtual medium loss detection method as claimed in claim 2, it is characterised in that described step (5)
Remotely it is controlled simulating different dielectric losses to accurate phase shift block and precision current amplification module including control module
Factor and capacitance.
6. a kind of virtual medium loss detection method as claimed in claim 2, it is characterised in that described precision current
The output electric current of amplification module can be adjusted by demand with the voltage magnitude ratio being applied on voltage ratio conversion module and phase contrast
Joint, can simulate the various capacitances of 100pF～1uF and the various dielectric dissipation factors of 0～0.1.
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| CN201310627377.5A CN103760508B (en) | 2013-11-28 | 2013-11-28 | A kind of virtual medium loss device and detection method thereof |
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| 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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| CN101382588B (en) * | 2008-09-22 | 2011-03-30 | 慈溪伟吉电子有限公司 | Three phase harmonic standard electric energy meter |
| CN102736049B (en) * | 2011-11-25 | 2014-11-19 | 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 |
| CN103383443B (en) * | 2013-07-31 | 2015-10-28 | 上海仪器仪表研究所 | Modularization three-phase instrument calibration device used for intelligent electric network |
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