CN202083790U - Sinusoidal reactive power calibration system - Google Patents

Sinusoidal reactive power calibration system Download PDF

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Publication number
CN202083790U
CN202083790U CN2011200091534U CN201120009153U CN202083790U CN 202083790 U CN202083790 U CN 202083790U CN 2011200091534 U CN2011200091534 U CN 2011200091534U CN 201120009153 U CN201120009153 U CN 201120009153U CN 202083790 U CN202083790 U CN 202083790U
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CN
China
Prior art keywords
current
voltage
comparator
calibration system
reactive power
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Expired - Fee Related
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CN2011200091534U
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Chinese (zh)
Inventor
杨林
白静芬
王猛
林繁涛
薛金会
王丽莎
赵莎
关阳
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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Priority to CN2011200091534U priority Critical patent/CN202083790U/en
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Publication of CN202083790U publication Critical patent/CN202083790U/en
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Abstract

The utility model belongs to the field of a reactive power electric energy calibration system in the electric device and instrument industry, more specifically relates to the technical field of electrical automation measurement, computer communication and the like, and provides a sinusoidal reactive power calibration system. The sinusoidal reactive power calibration system comprises a voltage source, an AC-DC thermoelectric comparator, a power comparator bridge, a quadrature current source, a trsanscondutance amplifier, a current transformer, a detecting amplifier, a voltage divider and a to-be-detected meter. The system of the utility model enables reproduction of sinusoidal reactive power basic values to be realized according to the classic definition of reactive power, and helps to fill in the blanks for the domestic reactive value standard and the transmission work.

Description

Sinusoidal reactive power calibration system
Technical field
The utility model belongs to electrotechnical instrument and meter industry reactive power electric energy calibration system field, relates more specifically to technical fields such as electric automatization measurement, computing machine communication, and a kind of sinusoidal reactive power calibration system is provided.
Background technology
Be accompanied by development of electric power industry, more and more important to evaluation, the metering of reactive power.The domestic up to now reactive measurement standard of not setting up as yet.Because the value disunity has caused influence in various degree for electrical production, operation, management, the metering of grass-roots unit.Sinusoidal reactive power calibration system adopts current comparator formula power bridge technology to carry out the research and development of reactive power measurement function, has solved the reactive power of high-grade multi-functional standard scale, the accurate measurement of electric energy.For unified idle value, orderly management in accordance with the law, set up the basic technology platform.
The utility model content
For solving the problem of accurately tracing to the source of high-grade idle standard scale, the purpose of this utility model is to propose a kind of sinusoidal reactive power calibration system based on the current comparator power bridge, reactive power definition according to classics, reappear the basic value of sinusoidal reactive power, filled up the blank of the domestic idle value standard and the work of transmission thereof.
For achieving the above object, the utility model adopts following technical proposals to realize:
A kind of sinusoidal reactive power calibration system, it comprises: voltage source, alternating current-direct current thermoelectric comparator, power comparator electric bridge, quadrature current source, trsanscondutance amplifier, current transformer, detecting amplifier, voltage divider and tested table; Described voltage source is respectively the alternating current-direct current thermoelectric comparator, voltage divider and the power supply of tested table, the operating voltage of this calibration system is produced after the voltage divider dividing potential drop by voltage source, this operating voltage is applied to and produces in-phase current Ir and quadrature current Ic on the quadrature current source, in-phase current Ir and quadrature current Ic input to the Nr of power comparator electric bridge respectively, the Nc winding terminal, the described electric current of being supplied with tested table by voltage source is connected to the Nx end of power comparator electric bridge after the conversion of trsanscondutance amplifier summation current transformer, Nr with power comparator electric bridge, the in-phase current Ir and the quadrature current Ic of the input of Nc winding terminal compare, relatively the out-of-balance current of gained is back to detecting amplifier, described detecting amplifier is input to the voltage of trsanscondutance amplifier according to out-of-balance current adjustment, and the range ability of described current transformer is 0.1-100A.
Wherein, described computing machine is controlled the course of work of this calibration system.
Calibration process for DC100V voltage is: the DC100V voltage of direct voltage source output is 10V through the voltage divider dividing potential drop, this 10V voltage compares by the digital multimeter and the solid-state voltage standard of pin-point accuracy, this solid-state voltage standard is traceable on the DC voltage working standard, calculate the actual value of this 10V voltage, multiply by the actual value that the dividing potential drop coefficient just obtains DC100V again, adjust the value of setting of direct voltage source with this, make it export a DC100V voltage accurately.
Calibration process for alternating voltage is: alternating voltage is produced by the standard voltage source of high stability, be divided into the 100V input system by current comparator formula high-voltage bleeder, this AC 100V voltage and DC 100V voltage are accurately inserted two input channels of AC-DC conversion standard respectively, the operating voltage of system is traceable to the accuracy to guarantee to measure on the DC voltage by the alternating current-direct current thermoelectric comparator.
The self-poise process of current comparator is: 100V alternating voltage input system produces 10mA in-phase current I on quadrature current source internal standard resistance and standard capacitance RWith quadrature current Ic, I RDistinguish the relatively N of ceremony power bridge of input current with Ic R, Nc end, detecting amplifier calculates existence one phase bit between generation and AC REF according to the phase place and the size of current of test point, and sizeable driven trsanscondutance amplifier, produce electric current, there is the certain proportion relation in this current value with the electric current that outputs to tested table; The precision current mutual inductor comprises two-stage, and wherein first order mutual inductor outputs to tested table after the current ratio of trsanscondutance amplifier output is changed, and to 1A in, the Nx that is connected to current comparator holds another grade mutual inductor, with N with the current transformation of output R, Nc end input normalized current I R, Ic compares, and detects winding N DDetected out-of-balance current returns detecting amplifier, detecting amplifier is constantly adjusted the voltage that is input to trsanscondutance amplifier according to the out-of-balance current size, thereby constantly change the electric current in the tested table, move in circles, up to the current comparator balance, finally, under the effect of the self-poise of current comparator and backfeed loop, realize the automatic floating voltage of tested electric current.
The advantage of technical solutions of the utility model is:
1, the current comparator The Application of Technology realizes tested current tracking alternating voltage by current comparator formula power bridge in native system; In the quadrature current source, by means of the capacitance bridge structure of current comparator principle, high capacity value working capacitor can be directly and the low capacity normal air electric capacity of low-loss, good stability compare, thereby obtain calibration.Can realize its performance index being improved dynamic compensation to mutual capacitance greatly, thereby obtained pure, stable quadrature current by current comparator.
2, wide-range is provided with voltage, the current range setting of sinusoidal reactive power/electric energy calibration system, has covered the range ability of all kinds standard scale of present domestic use, wherein, and voltage measurement scope: 57V-480V; Current measuring range: 0.5A-100A; Power factor: 0 (L)~1.0~0 (C); Both guarantee on basic range, to obtain the highest accuracy and stability, and also taken into account wide region simultaneously and measure, can satisfy the different demands of laboratory and in-site measurement.
3, the mode of tracing to the source is traced to the source under the virtual voltage of system works by basic electricity parameter DC voltage standard, measuring resistance and standard capacitance, has reduced the uncertainty that the intermediate link transmission brings greatly.The accuracy index of total system is improved greatly.
Description of drawings
Fig. 1 is the structural representation of sinusoidal reactive power calibration system of the present utility model;
Fig. 2 is the quadrature current loop synoptic diagram according to system of the present utility model;
Fig. 3 is the theory structure synoptic diagram according to system of the present utility model.
Embodiment
Below in conjunction with accompanying drawing sinusoidal reactive power calibration system of the present utility model is further described in detail.
As shown in figures 1 and 3, this sine reactive power calibration system comprises: voltage source, alternating current-direct current thermoelectric comparator, power comparator electric bridge, quadrature current source, trsanscondutance amplifier, current transformer, detecting amplifier, voltage divider and tested table, voltage source is respectively alternating current-direct current thermoelectric comparator, voltage divider and the power supply of tested table, the operating voltage of this calibration system is produced after the voltage divider dividing potential drop by the pin-point accuracy voltage source, follow the tracks of the also drift variation of compensation work voltage by alternating current-direct current thermoelectric comparator and direct voltage source, guarantee accuracy; This operating voltage is applied to and produces in-phase current Ir and quadrature current Ic on the quadrature current source, in-phase current Ir and quadrature current Ic input to Nr, the Nc winding terminal of power comparator electric bridge respectively, and the number of turn of Nr, Nc winding terminal is that the phase calculation according to test point obtains; The electric current of being supplied with tested table by voltage source is connected to the Nx end of power comparator electric bridge after the conversion of trsanscondutance amplifier summation current transformer, compare with the Nr of power comparator electric bridge, the in-phase current Ir and the quadrature current Ic of Nc winding terminal input, relatively the out-of-balance current of gained is back to detecting amplifier, detecting amplifier is input to the voltage of trsanscondutance amplifier according to out-of-balance current adjustment, circulation repeatedly is up to power comparator bridge balance.The range ability of described current transformer is 0.1-100A.
When a known alternating voltage U was added on the resistance R, the power consumption that is produced was U 2/ R, and the effective value of alternating voltage is to determine by the DC quantity with identical thermoelectric effect, by thermoelectric (al) inversion direct current standard value is passed to interchange, so just can derive power unit, again calibration power be done temporal extension and just can obtain electric energy from DC voltage standard, resistance standard.This is foundation from learning the method for base unit derivation electric energy with ohmically power consumption, because high-power precision resistance is difficult for manufacturing and designing, therefore expands working current by current comparator.
This measuring system is that the basis is set up with DC voltage standard, alternating current-direct current thermoelectric comparator, interchange measuring resistance and standard capacitance, adopted the working method of under the actual load of system works, directly calibrating alternating voltage by DC voltage, stable basic electricity parameter is traced to the source by maturation, thereby has guaranteed the pin-point accuracy and the high reliability of meritorious value.
Need stablize when the power electric bridge is used for wattless power measurement, orthogonal reference electric current accurately.Native system is in realizing reactive power/electric energy calibration process, and quadrature current is provided by the electric capacity that inserts voltage circuit, reinject after current comparator the carries out transformation of scale current return of tested table of this quadrature current.Capacitance bridge by the current comparator principle provides transformation of scale, with the current transformation of the mutual capacitance of flowing through is little electric current, low capacity normal air electric capacity and the effect of backfeed loop and the self-poise of current comparator by low-loss, excellent stability obtain pure, stable specified quadrature current.
The alternating voltage of device is produced by the standard voltage source of high stability, by high-voltage bleeder voltage is become the 100V input system, produces 10mA in-phase current I on quadrature current source internal standard resistance and standard capacitance rWith quadrature current Ic, I rRelatively Nr, the Nc of ceremony power bridge hold (Nr, the number of turn of Nc is to calculate according to the phasometer of test point) with Ic difference input current.The electric current of tested table of flowing through is connected to the Nx end of current comparator after trsanscondutance amplifier, current transformer conversion, with the normalized current I of Nr, Nc end input r, Ic compares, and detects the detected out-of-balance current of winding and returns detection/amplifier, and detection/amplifier is constantly adjusted the voltage that is input to trsanscondutance amplifier according to out-of-balance current, and circulation repeatedly is up to the current comparator balance.When current comparator reached balance, following relation was set up:
I rN r+I cN c=I xN x
Fig. 2 is the quadrature current loop diagram.
According to circuital law, the quadrature current of being exported by this comparator can be expressed as:
Therefore,, can realize calibration and dynamic compensation, export pure, stable quadrature current mutual capacitance by the capacitance bridge structure of this current comparator principle.This quadrature current source has guaranteed the accuracy of reactive power metering for power comparator bridge provides the quadrature current of standard.
The utility model is described according to specific exemplary embodiment herein.To carry out suitable replacement under the scope of the present utility model or revise will be conspicuous not breaking away to one skilled in the art.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present utility model, scope of the present utility model is by appended claim definition.

Claims (2)

1. sinusoidal reactive power calibration system, it is characterized in that this calibration system comprises: voltage source, alternating current-direct current thermoelectric comparator, power comparator electric bridge, quadrature current source, trsanscondutance amplifier, current transformer, detecting amplifier, voltage divider and tested table; Described voltage source is respectively the alternating current-direct current thermoelectric comparator, voltage divider and the power supply of tested table, the operating voltage of this calibration system is produced after the voltage divider dividing potential drop by voltage source, this operating voltage is applied to and produces in-phase current Ir and quadrature current Ic on the quadrature current source, in-phase current Ir and quadrature current Ic input to the Nr of power comparator electric bridge respectively, the Nc winding terminal, the described electric current of being supplied with tested table by voltage source is connected to the Nx end of power comparator electric bridge after the conversion of trsanscondutance amplifier summation current transformer, Nr with power comparator electric bridge, the in-phase current Ir and the quadrature current Ic of the input of Nc winding terminal compare, relatively the out-of-balance current of gained is back to detecting amplifier, described detecting amplifier is input to the voltage of trsanscondutance amplifier according to out-of-balance current adjustment, is circulated to power comparator bridge balance repeatedly.The range ability of described current transformer is 0.1-100A.
2. the system as claimed in claim 1 is characterized in that this calibration system links to each other with computing machine, and described computing machine is controlled the course of work of this calibration system.
CN2011200091534U 2011-01-13 2011-01-13 Sinusoidal reactive power calibration system Expired - Fee Related CN202083790U (en)

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Application Number Priority Date Filing Date Title
CN2011200091534U CN202083790U (en) 2011-01-13 2011-01-13 Sinusoidal reactive power calibration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200091534U CN202083790U (en) 2011-01-13 2011-01-13 Sinusoidal reactive power calibration system

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103472426A (en) * 2013-09-26 2013-12-25 国家电网公司 Sinusoidal active power calibration system based on current comparator
CN105572625A (en) * 2015-12-15 2016-05-11 国网辽宁省电力有限公司大连供电公司 Reactive electric energy error automatic checking device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103472426A (en) * 2013-09-26 2013-12-25 国家电网公司 Sinusoidal active power calibration system based on current comparator
CN105572625A (en) * 2015-12-15 2016-05-11 国网辽宁省电力有限公司大连供电公司 Reactive electric energy error automatic checking device

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Owner name: STATE GRID CORPORATION OF CHINA

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Effective date: 20140321

Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE

Effective date: 20140321

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Effective date of registration: 20140321

Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing

Patentee after: State Grid Corporation of China

Patentee after: China Electric Power Research Institute

Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15

Patentee before: China Electric Power Research Institute

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: 20111221

Termination date: 20170113