CN207799054U - One kind measuring circuit based on double-stage voltage transformer principle of stacking - Google Patents
One kind measuring circuit based on double-stage voltage transformer principle of stacking Download PDFInfo
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Abstract
The utility model is related to high accuracy voltage transformer voltage coefficient fields of measurement, specifically there is provided one kind measuring circuit based on double-stage voltage transformer principle of stacking, it overcomes since concatenated two voltage transformers shield not perfect, the not high influence brought to serial addition measurement circuit of proportional linearity degree in voltage mutual inductor serial addition self calibration so that the voltage transformer voltage coefficient uncertainty of measurement based on double-stage voltage transformer principle of stacking reaches 10‑6Magnitude.It includes nominal transformation ratio and the identical tested double-stage voltage transformer T1 of voltage, semi-insulating double-stage voltage transformer T2, all insulation double-stage voltage transformer T3 and comparison means etc. to measure circuit.The primary and secondary of described T2, T3 is connected in series with respectively, and the tested double-stage voltage transformer T1 carries out the comparison measurement of error according to principle of stacking successively with T2, T3 and connecting for they respectively, and calculates the voltage coefficient for obtaining and being tested voltage transformer T1.
Description
Technical field
The utility model is related to measure high accuracy standard potential transformer voltage coefficient field, it is specifically related to one kind and is based on
Double-stage voltage transformer principle of stacking measures circuit.
Background technology
In order to ensure electric energy fair trade, periodic dosages are needed to examine and determine for the measurement mutual inductor at electricity consumption critical point.Therefore, standard
Accurately to electric energy fair trade, power equipment and line loss, accurately metering is all significant for the magnitude of voltage transformer.Such as,
The power factor representative value of large capacity air reactor is 0.001~0.004, if loss measurement Error Tracing ＆ will reach small
In 1%, the accuracy of voltage ratio standard just needs to be higher than 0.001%.2014, China National Measuring Science Research Inst. had developed one
Set 10kV is arrivedKV, 0.0002 grade to 0.001 grade, voltage coefficient (2-5) × 10-6Twin-stage standard potential transformer
(including semi-insulating and all insulation), and the mutual inductor has been evaluated by voltage mutual inductor serial addition and high voltage standard capacitor method
Voltage coefficient.(IEEE TIM,2015,64(6):1831.Chinese invention patent application number：CN 201410483352.7)
The voltage coefficient measurement method of voltage transformer is that high-voltage ratio is traced to the source the emphasis of research.1954, German scholar
Forger and Zinn has been put forward for the first time " mutual inductor voltage connection in series-parallel addition " principle, that is, uses the mutual induction of voltage of two known ratios
Device connects the method for obtaining new ratio.1958, Zinn was added in German PTB through 12 phases and builds using this method since 100V
120kV electromagnetic type power-frequency voltage ratio standards are found, uncertainty is 1.2 × 10-5。
1991, national high-voltage metering station was improved on the basis of " mutual inductor connection in series-parallel addition ", completes " base
In the research of the serial addition circuit of all insulation voltage transformer " (Chinese invention patent number 90100301.8), and establish me
State 110kV power-frequency voltage ratio standard devices, ratio uncertainty reach 1 × 10-5(metering journal, 1992,13 (3):221).
In serial addition circuit research based on all insulation voltage transformer, the variation generation of screen potential when measuring three times
Shielding leakage error characteristics are influenced relatively large, and with the raising of voltage class, influence further to increase.2009
Year, national high-voltage metering station was on the basis of developing 1000kV series-type voltage mutual inductors, it is proposed that " semi-insulating addition " (in
State's invention patent No. 201110185680.9), it is right using semi-insulating additionKV power frequency ratio standards are measured,
Accuracy reaches 0.002 grade, and uncertainty of measurement is reduced to 5 × 10-6(for electricity consumption, 2013,30 (2)：71).
2013, Electrical Power Research Institute of Guangdong Power Grid Corporation, which proposes, " measured the circuit of voltage transformer voltage coefficient
And method ", it is summarised as " single-stage mutual inductor principle of stacking mensuration " (Chinese invention patent number 201310154185.7), is described
A passive linear is formed using the identical shield type earthed voltage transformer of two rated voltage ratios and an isolating transformer
Circuit encourages the additivity with response, the shielding of the voltage transformer by forming the passive linear circuit using linear circuit
Error is cancelled out each other during superposition, overcomes influence of the voltage transformer shielding error to serial addition circuit.However,
Principle of stacking is only applicable to linear circuit, is limited by the linearity of single electrode voltage mutual inductor used, the measurement of voltage coefficient is not
The transformer voltage coefficient that degree of certainty is difficult to meet more high accuracy measures.
As shown in Figure 1, Figure 2, Figure 3 shows, serial addition measures the voltage coefficient for being tested mutual inductor (T1), includes mainly following three
It is secondary relatively to measure, i.e.,：(1) semi-insulating mutual inductor T2 is measured compared with tested mutual inductor T1, obtains ε1；(2) all insulation mutual inductor T3
Tested mutual inductor T1 compares measurement, obtains ε2；(3) after all insulation mutual inductor, semi-insulating mutual inductor serial with tested mutual inductor T1 ratios
Compared with measuring to obtain ε3.If error of T1, T2, T3 mutual inductor at voltage U is respectively α (U), β (U), γ (U)；eT2、eT3For step
(3) in when above-mentioned mutual inductor serial addition, under mutual inductor T2 and T3 series connections, different conditions when being used alone with T2, T3
The error of introducing；ε3To assume that mutual inductor T2 is used in series with T3 compared with exclusive use, situation is introduced without extra error
Under, obtained error is measured compared with tested mutual inductor T1, i.e.,Then have：
ε1=α (U)-β (U) (1)
ε2=α (U)-γ (U) (2)
It can be obtained by formula (1), (2), (3)：
In existing mutual inductor serial addition, step (1), (2) in experiment respectively individual T2 or T3 compared with T1
To ε1、ε2, do not account for T2 and T3 and influence each other the error e of introducingT2、 eT3, and step (3) inevitably introduces eT2、
eT3, therefore, according to formulaCalculate T1When voltage coefficient,
eT2、eT3It will have an impact.Experiment shows to shield the error increment of the change of not perfect and working condition and introducing due to mutual inductor
eT2、eT3And the reasons such as non-linear that single-stage mutual inductor is larger, in 110kV and the above voltage levels transformer voltage coefficient
In measurement, 10 are obtained-6The uncertainty of measurement of magnitude is more difficult.
Utility model content
The utility model is in order to solve the above technical problems, provide a kind of based on the measurement of double-stage voltage transformer principle of stacking
Circuit overcomes in existing single electrode voltage mutual inductor serial addition self calibration since the shielding of concatenated two voltage transformers is endless
Kind, not good etc. enough the influence that serial addition circuit is brought of proportional linearity so that folded based on double-stage voltage transformer serial addition
The voltage transformer voltage coefficient uncertainty of measurement of principle is added to reach 10-6Magnitude.
In order to solve the above technical problems, provided by the utility model a kind of based on the measurement of double-stage voltage transformer principle of stacking
Circuit, including nominal transformation ratio and the identical tested double-stage voltage transformer T1 of voltage, semi-insulating double-stage voltage transformer T2, it is complete absolutely
Edge double-stage voltage transformer T3, the semi-insulating double-stage voltage transformer T2, all insulation double-stage voltage transformer T3 primary and
It is secondary to be connected in series with respectively, the tested double-stage voltage transformer T1 respectively with semi-insulating double-stage voltage transformer T2, all insulation
Double-stage voltage transformer T3 and their series connection compare measurement error according to principle of stacking successively, and calculate acquisition and be tested voltage
The voltage coefficient of mutual inductor.
Further, described double-stage voltage transformer T1, T2 and T3 can be low pressure excitation double-stage voltage transformers, can also
It is high-voltage excitation double-stage voltage transformer.
Further, the voltage class of described double-stage voltage transformer T1, T2 and T3 are not limited to 10kV and arrive
By using above-mentioned technical solution, the utility model has the beneficial effects that：A kind of base provided by the utility model
The technical solution of circuit and its working method is measured in double-stage voltage transformer principle of stacking, passes through all insulation dual stage voltage mutual inductance
Device T2, semi-insulating double-stage voltage transformer T3 primary and secondary winding be connected in series with respectively after with tested mutual inductor T1 compared with survey
Measure ε3', although being still incorporated into error eT2、eT3, but by the way that step in the prior art (1) (2) is accordingly adjusted to step
A, the mode of B " with school ", according to formulaCalculate the voltage of T1
When coefficient, due to shield it is not perfect caused by T2 and influencing each other for T3 and the e that introducesT2、 eT3Be eliminated, overcome due to
Concatenated two voltage transformers shield not perfect to voltage coefficient measurement result in voltage mutual inductor serial addition self calibration
It influences；Again because concatenated two voltage transformers are double-stage voltage transformer, there is better ratio compared with single electrode voltage mutual inductor
The linearity more meets the linear circuit precondition of principle of stacking so that measures line based on double-stage voltage transformer principle of stacking
The voltage transformer voltage coefficient uncertainty of measurement on road reaches 10-6Magnitude.
Description of the drawings
Fig. 1 is based on semi-insulating single-stage mutual inductor Voltage Series addition principle circuit；
Fig. 2 is based on T1 in semi-insulating single-stage mutual inductor serial addition and the direct comparison principle circuits of T2；
Fig. 3 is based on T1 in semi-insulating single-stage mutual inductor serial addition and the direct comparison principle circuits of T3；
Fig. 4 be according to the semi-insulating twin-stage mutual inductor T2 of principle of stacking compared with tested twin-stage mutual inductor T1 measuring principle line
Road；
Fig. 5 be according to principle of stacking all insulation twin-stage mutual inductor T3 compared with tested twin-stage mutual inductor T1 measuring principle line
Road；
Fig. 6 is that the semi-insulating twin-stage mutual inductor T2 of all insulation twin-stage mutual inductor T3 series connection is surveyed compared with tested twin-stage mutual inductor T1
Measure scheme circuit.
Specific implementation mode
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments:
As shown in Fig. 4, Fig. 5, Fig. 6, one kind provided by the invention measures circuit based on double-stage voltage transformer principle of stacking,
It is double including the identical tested double-stage voltage transformer T1 of nominal transformation ratio and voltage, semi-insulating double-stage voltage transformer T2, all insulation
Step voltage mutual inductor T3, the semi-insulating double-stage voltage transformer T2, all insulation double-stage voltage transformer T3 it is primary and secondary
Winding is connected in series with respectively, the tested mutual inductor T1 respectively with the semi-insulating mutual inductor T2 under series connection, all insulation mutual inductance
Device T3 compares measurement error.
A kind of working method measuring circuit based on double-stage voltage transformer principle of stacking provided by the utility model, setting
Nominal transformation ratio and the identical tested double-stage voltage transformer T1 of voltage, semi-insulating double-stage voltage transformer T2, all insulation twin-stage electricity
It is respectively α (U), β (U), γ (U) to press errors of the mutual inductor T3 at voltage U, sets ε1For semi-insulating mutual inductor T2 and it is tested mutual
Sensor T1 directly compares the error for measuring and obtaining, i.e. ε1=α (U)-β (U)；ε2For all insulation mutual inductor T3 and tested mutual inductor T1
Directly relatively measure obtained error, i.e. ε2=α (U)-γ (U)；ε3It is used in series for hypothesis mutual inductor T2 and T3 and individually makes
With compared in the case of being introduced without extra error, obtained error being measured compared with tested mutual inductor T1, i.e.,Set eT2Phase is being used alone with T2 under series connection for semi-insulating mutual inductor T2
Than, the error introduced by working condition difference, eT3For all insulation mutual inductor T3 under series connection with T3 be used alone when
It compares, the error introduced by working condition difference, working method includes the following steps：
A. the semi-insulating double-stage voltage transformer T2 is measured under series connection compared with tested mutual inductor T1, is obtained
ε1', in measurement, keep primary, the secondary winding of semi-insulating double-stage voltage transformer T2 and all insulation double-stage voltage transformer T3
It connects respectively, is connected with voltage U after the high low side difference short circuit of an excitation and ratio of T3, that is, retains all insulation mutual inductor T3's
The high low side of first winding is in the state of high potential U, and the tested mutual inductor T1 on-load voltage U then have：
ε1'=ε1+eT2=α (U)-(β (U)+eT2)；
B. all insulation double-stage voltage transformer T3 is measured under series connection compared with tested mutual inductor T1, is obtained
ε2', in measurement, keep primary, the secondary winding of semi-insulating double-stage voltage transformer T2 and all insulation double-stage voltage transformer T3
Connect respectively, an excitation of semi-insulating double-stage voltage transformer T2, ratio winding high low side short circuit after with ground phase
Even, the tested mutual inductor T1 on-load voltage U then have：
ε2'=ε2+eT3=α (U)-(γ (U)+eT3)；
C. the semi-insulating double-stage voltage transformer T2 and the primary of all insulation double-stage voltage transformer T3, secondary winding point
Not Chuan Lian after measure to obtain ε compared with tested mutual inductor T13', the tested mutual inductor T1 on-load voltage 2U then have：
Therefore, the error change amount of T1 when can determine that voltage changes to 2U from U by measuring three times, successively recursion to higher
Voltage, the correlation curve of the cumulative error and voltage that can obtain T1, i.e. voltage coefficient curve.
Operation principle：All insulation double-stage voltage transformer T2, semi-insulating double-stage voltage transformer T3 it is primary and secondary around component
After not being connected in series with ε is measured to obtain compared with tested mutual inductor T13', although being still incorporated into error eT2、eT3, but pass through step (1), (2)
The corresponding mode for being adjusted to step A, B " with school ", according to formula
When calculating T1 voltage coefficients, the e of the introducing that influences each other due to shielding not perfect caused T2 and T3T2、 eT3It is eliminated, from
And it overcomes since concatenated two voltage transformers shielding is not perfect to voltage system in voltage mutual inductor serial addition self calibration
The influence of number measurement result.
The present invention has been described in detail through specific embodiments, but these not constitute the limit to the present invention
System.For example, the double-stage voltage transformer can be the high-voltage excitation double-stage voltage transformer in Fig. 4 Fig. 5 Fig. 6, can also be
Low pressure excitation double-stage voltage transformer；The voltage class of double-stage voltage transformer is not also arrived by 10kVLimitation.
Without departing from the principles of the present invention, those skilled in the art can also make many modification and improvement, these should also be regarded
For protection scope of the present invention.
Claims (3)
1. one kind measuring circuit based on double-stage voltage transformer principle of stacking, which is characterized in that including nominal transformation ratio and voltage phase
With tested double-stage voltage transformer T1, semi-insulating double-stage voltage transformer T2, all insulation double-stage voltage transformer T3, described half
Primary and secondary being connected in series with respectively of insulation double-stage voltage transformer T2, all insulation double-stage voltage transformer T3, it is described tested
Double-stage voltage transformer T1 respectively with semi-insulating double-stage voltage transformer T2, all insulation double-stage voltage transformer T3 and they
The comparison that series connection carries out error according to principle of stacking successively measures, and calculates the voltage coefficient for obtaining and being tested voltage transformer.
2. according to claim 1 a kind of based on double-stage voltage transformer principle of stacking measurement circuit, which is characterized in that institute
It can be low pressure excitation double-stage voltage transformer to state double-stage voltage transformer T1, T2 and T3, can also be high-voltage excitation twin-stage electricity
Press mutual inductor.
3. according to claim 1 a kind of based on double-stage voltage transformer principle of stacking measurement circuit, which is characterized in that institute
The voltage class for stating double-stage voltage transformer T1, T2 and T3 is not limited to 10kV and arrives
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107861088A (en) * | 2017-12-22 | 2018-03-30 | 中国计量科学研究院 | One kind is based on double-stage voltage transformer principle of stacking measurement circuitry and its method of work |
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| CN107861088A (en) * | 2017-12-22 | 2018-03-30 | 中国计量科学研究院 | One kind is based on double-stage voltage transformer principle of stacking measurement circuitry and its method of work |
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