CN102313878A - High-accuracy calibrating device for mutual inductor load box - Google Patents

High-accuracy calibrating device for mutual inductor load box Download PDF

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Publication number
CN102313878A
CN102313878A CN201110116158A CN201110116158A CN102313878A CN 102313878 A CN102313878 A CN 102313878A CN 201110116158 A CN201110116158 A CN 201110116158A CN 201110116158 A CN201110116158 A CN 201110116158A CN 102313878 A CN102313878 A CN 102313878A
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resistance
burden box
accuracy
mutual inductor
value
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王晓琪
王欢
项琼
李璿
王玲
费晔
毛安澜
汪本进
余春雨
吴士普
陈晓明
冯宇
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State Grid Electric Power Research Institute
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Abstract

The invention relates to a high-accuracy calibrating device for a mutual inductor load box. According to the device, a Maxwell-Wien bridge principal is adopted to adjust the resistance-capacitance values of a capacitor bridge arm in an electric bridge, thus, the resistance value of the measured load box can be calculated conveniently, and the accuracy of the resistance value is only related to the accuracy of the resistor-capacitor components and the inherent components of the circuit, the test result is not affected by the quality of power supply frequency or harmonic and the like. The device has good traceability, the calibrating method is scientific, and the measuring accuracy has a great improving space.

Description

A kind of pin-point accuracy mutual inductor Burden box calibrating installation
Technical field
The present invention relates to a kind of pin-point accuracy mutual inductor Burden box calibrating installation, be specially and adopt the Maxwell bridge principle, belong to Experiment of Electrical Engineering instrument and equipment technical field the calibration of mutual inductor Burden box.
Background technology
The mutual inductor Burden box is a kind of device that is used for the transformer error Characteristics Detection; The accuracy of mutual inductor Burden box affects the uncertainty of measurement appreciable levels of transformer error testing result; Having known mutual inductor Burden box calibration is adopt " impedance detection method " or " admittance detection method ", and based on magnetic potential balance principle (GE series of comparisons appearance) or electric potential balancing principle (HE series potential difference meter), measurement result receives the power quality (stability of waveform during owing to detection; Factors such as frequency) influence is bigger; Wild effect often occurs, the uncertainty of measurement level is not high, directly influences the testing result level; Therefore, mostly the accuracy of this type transducer check device is 3 grades or 2 grades.The later stage eighties in last century, the 110kV power frequency electric power ratio standard self-calibration system device development project that Wuhan High Voltage Research Institute begins to bear, the HEG1 type potential difference (PD) formula mutual-inductor tester of development reaches 1 grade level; The nineties, mutual inductor Burden box calibrating installation was also realized digitizing, but this type pick-up unit level of accuracy also just rests on 2 grades or 3 grades.
Well-known in the world electric instrument manufacturing firm, its mutual inductor Burden box calibrating installation has early been realized digitizing, but digitizing Burden box calibrating installation product is mainly towards general test experience chamber.It is technical to trace to the source at mutual inductor, and first-class in the world testing agency (like states such as Germany, Canada, Britain) still adopts principles of electric and electronic engineering calibrating installation, clear principle, and reliability is high.
(application number: the 200910074386.X applying date: (application number: 200910074387.4 applyings date: 2009-05-14) related is that simulation load box is made to Chinese invention patent " voltage transformer simulation load box " 2009-05-14) to reach " current transformer simulation load box "; And not mentioned Burden box check problem; Pin-point accuracy Burden box method of calibration and device are not shown in the existing patent documentation.
Summary of the invention
The objective of the invention is problem to the background technology proposition; A kind of pin-point accuracy mutual inductor Burden box calibrating installation is provided, and this device adopts the Maxwell bridge principle, regulates the resistance capacitance value of electric capacity brachium pontis in the electric bridge; Can calculate the resistance value of tested Burden box easily; Its accuracy is only relevant with the accuracy of Resistor-Capacitor Unit and the intrinsic element of circuit, and test result does not receive quality influence such as supply frequency or harmonic wave, and traceability is good; Calibration steps science, accuracy of measurement have bigger room for promotion.
Technical scheme of the present invention is: a kind of pin-point accuracy mutual inductor Burden box calibrating installation, be based on Maxwell's principle, be used to measure the LC alternating current bridge of impedance, described electric bridge is made up of four brachium pontis, galvanometer and additional power sources; The test specimen Burden box is in the brachium pontis, is series connection inductive reactive element L xAnd r x, also have two resistive arms and a capacitance-resistance arm, it is characterized in that: two resistive arm R 2And R--- 3All are three resistance that can insert separately of different resistances, the electric capacity arm is by tunable capacitor C and adjustable resistance R 4Compose in parallel, tunable capacitor C is 4 variable capacitance dishes, adjustable resistance R 4Be 4 resistance adjustment dishes, its beneficial effect is: can insert the resistance R of different resistances according to load different operating voltages or working current and frequency values 2, R ---3, the capacitance-resistance value on the fit adjustment electric capacity arm calculates Burden box induction reactance value easily, and this induction reactance value is irrelevant with the frequency and the harmonic wave of input power supply.
Principle of work of the present invention is: the Maxwell's principle LC alternating current bridge shown in accompanying drawing 1 is calibrated the mutual inductor Burden box by inductance L xWith resistance r xExpression, resistance R 2With its formation one side brachium pontis, R 3With R 4, C constitutes the opposite side brachium pontis.After inserting tested Burden box, regulate R 3, R 4And C, when showing, galvanometer G levels off to zero the time, and electric bridge reaches equilibrium point.Obtain according to the bridge balance principle: r x=R 2R 3/ R 4, L x=CR 2R 3
At present; General in the world voltage transformer (VT) Burden box, its resulting impedance is interval at 10 Ω～10k Ω, and corresponding rated power scope is generally 1.25～158.75VA; Corresponding WV multidigit is 100/ √ 3V, 110/ √ 3V, 120/ √ 3V and 100V, and frequency of operation is 50Hz or 60Hz.
The corresponding WV of China's voltage transformer secondary Burden box is 100/ √ 3V and 100V, and frequency is 50Hz.Through the higher limit and the lower limit of calculated load case, can obtain the resistance and the capacitance scope of each resistive arm of electric bridge, electric capacity arm.
In the parameter designing of the present invention, the load value of voltage transformer (VT) Burden box is in 1.25～20VA and two intervals of 40～80VA, by regulating resistive arm R 2Realize.
In the parameter designing of the present invention, resulting impedance value 0.02～50 Ω of current transformer Burden box, load range value 2.5～60VA, applying electric current is 5A, 1A.Because the impedance of current transformer Burden box is very little, form the resistance R of bridge arm 2The value of bridge arm was also less when span was calibrated with respect to the voltage transformer (VT) Burden box.
For the ease of L xAnd r xDirect reading, ratio arms R 2And R 3Product be controlled to be 10 multiple, i.e. L xAnd r xValue can be directly by R 4Value representation.R in this device 3As the multiplying power dish, get three groups of different resistance values, be respectively 2k Ω, 20k Ω and 200k Ω, the needs when detecting to satisfy the different load range.
For satisfying the direct-reading requirement, design R 2And R 3Product be 10 multiple, R in the device 3Value be taken as 2 multiple, so with R 2Be designed to 5 multiple: the voltage transformer (VT) Burden box is loaded when 1.25～20VA, R 2Get 50 Ω, load R when 40～80VA 2Get 5 Ω, the current transformer Burden box is loaded when 2.5～60VA, R 2Get 0.05 Ω.
Description of drawings
Accompanying drawing 1 exchanges LC electrical bridge principle figure for Maxwell;
Accompanying drawing 2 is an embodiment of the invention mutual inductor Burden box calibrating installation circuit theory diagrams.
Embodiment
Mark in the accompanying drawing:
In the accompanying drawing 1: S-external AC power supply, G-galvanometer, L xAnd r x-Burden box inductance, resistance, R 2, R 3-resistive arm, R 4, C-electric capacity arm; In the accompanying drawing 2: Z x-Burden box induction reactance, K 1-resistance R 2Switch, K 3-resistance R 3Switch.
Below in conjunction with accompanying drawing inventive embodiments is described further:
With reference to electrical bridge principle shown in the accompanying drawing 1, the embodiment of the invention shown in accompanying drawing 2, Z in the accompanying drawing 2 xRepresent mutual inductor Burden box to be detected, by r xAnd L xForm; R 21Be 50 Ω, R 22Be 5 Ω, R 23Be 0.05 Ω, R 31Be 2k Ω, R 32Be 20k Ω, R 33Be 200k Ω.
K switch 1Be used for R 2Conversion, 1 #, 2 #With 3 #Tie point corresponds respectively to R 21, R 22And R 23K switch 2Be used for R 3Switching, tie point 4 #, 5 #With 6 #The corresponding R of difference 31, R 32And R 33
When test specimen is the voltage transformer (VT) Burden box of 1.25～20VA, K 1Be connected to 1 #When test specimen is the voltage transformer (VT) Burden box of 40～80VA, K 1Be connected to 2 #When test specimen is the current transformer Burden box of 2.5～60VA, K 1Be connected to 3 #K 2Selection real for the multiplying power selection, according to the load value and the R of reality 4, C is used.
Adjustable resistance case R 4Be designed to 4 resistance adjustment dishes and form R 41: 1～11K, R 41=1k; R 42: 100 Ω～1k Ω, R 42=100 Ω; R 43: 10～100 Ω, R 43=10 Ω; R 44: 1～10 Ω, R 44=1 Ω.Be R 4The maximum value that can be adjusted to is 11 * 1K+10 * 100 Ω+10 * 10 Ω+10 * 1 Ω=12.11k Ω.
Adjustable electric tank C is designed to 4 capacitance adjustment dishes and forms C 41: 1 μ F～11 μ F, C 41=1 μ F; C 42: 0.1 μ F～1 μ F, C 42=0.1 μ F; C 43: 0.01 μ F～0.1 μ F, C 43=0.01 μ F; C 44: 0.001 μ F～0.01 μ F, C 44=0.001 μ F.Can obtain maximum capacitor is 11 * 1 μ F+10 * 100nF+10 * 10nF+10 * 1nF ≈ 12.11 μ F.
The correlation parameter of forming each element of electric bridge:
The required element of mutual inductor Burden box calibration circuit comprises: resistance R 2, R 3, R 4And capacitor C.
(1) resistance R 2Resistance be 0.05 Ω, 5 Ω and 50 Ω.Requirement can be born the power of 20V voltage and 12W, and accuracy requirement reaches 0.1 grade.
(2) resistance R 3Resistance be 2k Ω, 20k Ω and 200k Ω, requirement can be born the power of 120V voltage and 10W, accuracy requirement reaches 0.1 grade.
(3) resistance R 4Resistance regulate part by five and form, the maximal value that can regulate is 12.11k Ω.Requirement can be born the power of 20V voltage, 1W, and accuracy requirement reaches 0.1 grade.When the measuring voltage Burden box, reading is an admittance value, can read 0.0001S.
(4) maximal value of capacitor C is 12 μ F, and accuracy requirement reaches 0.1 grade, and maximum is born voltage will reach 20V * 3=60V.Can adopt the mode of mica capacitor parallel connection to arrive.
(5) its resistance of lead of being connected with the bridge calibration circuit of current transformer Burden box is fixed as 0.06 Ω.
The components and parts that relate in the measuring voltage mutual inductor Burden box can reach on technology, can adopt above-mentioned designing and producing to be used to measure mutual inductor Burden box calibrating installation.
2 the present invention further specify below in conjunction with accompanying drawing.
Embodiment one:
Voltage transformer (VT) Burden box input voltage is 100V, cos φ=0.8, and when rated load is 20VA, r x=400 Ω, L x=0.96H, R 21=50 Ω, the bridge balance principle obtains R 3=8R 4, calculate R 3Be at least 1.7k Ω.Get R 3=2k Ω, R so 4=250 Ω, C=9.6uF.Be K 1Be connected to 1 #
Real component:
Figure 179069DEST_PATH_IMAGE001
, R 4=250 Ω are during reading
Figure 939215DEST_PATH_IMAGE002
Since unit is chosen as mS, be about to R 3Multiply by 50 after dwindling 1000 times and obtain R 4The multiple that should dwindle.Because R 3Be unit all with k Ω, thus quite convenient for the computing of dwindling 1000 times, can direct-reading.In the time of can knowing that according to above analysis load when the voltage transformer (VT) Burden box is at 1.25～20VA, reading is R 4Value dwindle 100 times.The unit of reading is mS.
Idle component:
Idle component is exactly to measure the inductance value of Burden box the inside, is unit with H.With top example, L x=0.96H, L x=R 2R 3C=50 * 2000C=0.96H obtains C=9.6uF.Since unit is chosen as H, be exactly so with R 3After coordinating with 50 after dwindling 1000 times, the value that multiply by C is dwindled 1000 times of values that just obtain measuring L again.In the time of can knowing that according to above analysis load when the voltage transformer (VT) Burden box is at 1.25～20VA, reading is that the value of C is dwindled 10 times.The unit of reading is H.
Instance two
Voltage transformer (VT) Burden box input voltage is 100/ √ 3V, cos φ=0.8, and when rated load is 40VA, r x=66.6 Ω, L x=0.16H, R 22=5 Ω, R 3=20k Ω, R 4=1.5k Ω, C=1.6uF.Be K 1Be connected to 2 #
Real component:
Figure 393199DEST_PATH_IMAGE003
, R 4=1.5k Ω is during reading
Figure 529782DEST_PATH_IMAGE004
Since unit is chosen as mS, be exactly so with R 3Multiply by 50 after dwindling 1000 times and obtain R 4The multiple that should dwindle.But this moment, the read-around ratio theoretical value was little 10 times, just can obtain result of calculation so also will multiply by 10 to the result.In the time of can knowing that according to above analysis load when the voltage transformer (VT) Burden box is at 40～80VA, reading is R 4Value dwindle 100 times.The unit of reading is mS.
Idle component:
Idle component is exactly to measure the inductance value of Burden box the inside, is unit with H.With top example, L x=0.16H, L x=R 2R 3C=50 * 20000C=0.16H obtains C=1.6uF.Since unit is chosen as H, be exactly so with R 3After coordinating with 50 after dwindling 1000 times, the value that multiply by C is dwindled 1000 times of values that just obtain measuring L again.In the time of can knowing that according to above analysis load when the voltage transformer (VT) Burden box is at 40～80VA, reading is that the value of C is dwindled 10 times.The unit of reading is H.
Instance three
Current transformer Burden box input current 5A, cos φ=0.8, when rated load is 60VA, r x=1.92-0.06=1.86 Ω, L x=4.6mH, R 23=5 Ω are through the equivalent resistance R behind the CT 23 `=0.05 Ω.Obtain R according to the bridge balance principle 3=37.2R 4, R 3Be at least 8.36k Ω, R 3Get 20k Ω, R 4=538 Ω, C=4.6uF.Be K 1Be connected to 3 #
Real component:
Figure 385611DEST_PATH_IMAGE005
, R 4=538 Ω are during reading
Figure 316658DEST_PATH_IMAGE006
Be about to R 3After dwindling 1000 times and R 2 `Multiply each other and obtain R 4The multiple that should dwindle is again R 4Divided by this multiple that dwindles is exactly the r that measures xValue.The actual R that inserts 2Be R 2 `0.01 times, the numerical digit R that is read 3Dwindle and multiply by 10 times R after 1000 times 2Value, use R again 4Divided by this value.Can know that according to above analysis the admittance value when the current transformer Burden box is R 4Value dwindle 1000 times.The unit of reading is S.
Idle component:
Idle component is exactly to measure the inductance value of Burden box the inside, can be unit with mH.With top example, L x=4.6mH, Lx=R 2 `R 3C=0.05 * 20000C=4.6mH obtains C=4.6uF.Since unit is chosen as mH, be exactly so with R 3After dwindling 1000 times and R 2After coordinating, R 2Dwindle 100 times of values that multiply by C again and just can obtain measuring the value of L.Can know when test product is the current transformer Burden box that according to above analysis reading is that the value of C is dwindled 10 times.The unit of reading is mH.
The reading mode that obtains this device according to above instance analysis is:
The reading mode of voltage transformer (VT) Burden box/current transformer Burden box is as shown in the table.R 4With the value of C be the actual read number on the corresponding knob wheel, wherein R 4Unit be Ω, the unit of C is uF.
Figure DEST_PATH_IMAGE007
The present invention can know with existing method comparison:
Existing mutual inductor Burden box calibration steps is higher to the degree of dependence of power supply quality, and it is bigger that the accuracy that causes the mutual inductor Burden box to be measured is influenced by the frequency, higher hamonic wave of power supply etc.;
The present invention only needs can reach setting accuracy with general band isolating transformer AC power;
The adjustable displayed value of adjustable resistance, electric capacity by direct-reading can be known testing resistance, inductance value;
The accuracy of measurement value of testing resistance of the present invention, inductance value depends on the precision of resistance in the brachium pontis, tunable capacitor, adjustable resistance, so the accuracy of measurement result has bigger room for promotion, for example:
When the capacitance-resistance precision is 1 grade, the mutual inductor Burden box that adjustable is 3 grades;
When the capacitance-resistance precision is 0.5 grade, the mutual inductor Burden box that adjustable is 1 grade;
When the capacitance-resistance precision is 0.1 grade, the mutual inductor Burden box that adjustable is 0.5 grade;
When the capacitance-resistance precision is 0.05 grade, the mutual inductor Burden box that adjustable is 0.2 grade.

Claims (1)

1. pin-point accuracy mutual inductor Burden box calibrating installation, be based on Maxwell's principle, be used to measure the LC alternating current bridge of impedance, described electric bridge is made up of four brachium pontis, galvanometer and additional power sources; The test specimen Burden box is in the brachium pontis, is series connection inductive reactive element L xAnd r x, also have two resistive arms and a capacitance-resistance arm, it is characterized in that: two resistive arm R 2And R--- 3All are three resistance that can insert separately of different resistances, the electric capacity arm is by tunable capacitor C and adjustable resistance R 4Compose in parallel, tunable capacitor C is 4 variable capacitance dishes, adjustable resistance R 4Be 4 resistance adjustment dishes.
CN201110116158A 2011-05-06 2011-05-06 High-accuracy calibrating device for mutual inductor load box Pending CN102313878A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316892A (en) * 2014-10-16 2015-01-28 内蒙古电力(集团)有限责任公司 Transformer load box calibration device
CN104316893A (en) * 2014-10-16 2015-01-28 内蒙古电力(集团)有限责任公司 Full-automatic calibration method of transformer load box
CN106772197A (en) * 2017-01-05 2017-05-31 云南电网有限责任公司电力科学研究院 Calibration device for load box of mutual inductor
CN113702709A (en) * 2021-07-20 2021-11-26 中国电力科学研究院有限公司 Method for measuring resistance value of high-voltage arm of direct-current voltage transformer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607239A (en) * 1985-02-28 1986-08-19 The United States Of America As Represented By The Secretary Of The Army Adjustment of the frequency-temperature characteristics of crystal oscillators
CN1426036A (en) * 2001-12-08 2003-06-25 骆乃光 AC electric bridge demonstration instrument
CN101706535A (en) * 2009-12-09 2010-05-12 山西省电力公司电力科学研究院 Device and method for testing dielectric loss of high voltage transformer
CN202110271U (en) * 2011-05-06 2012-01-11 国网电力科学研究院 High-accuracy calibration device for load box of mutual inductor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607239A (en) * 1985-02-28 1986-08-19 The United States Of America As Represented By The Secretary Of The Army Adjustment of the frequency-temperature characteristics of crystal oscillators
CN1426036A (en) * 2001-12-08 2003-06-25 骆乃光 AC electric bridge demonstration instrument
CN101706535A (en) * 2009-12-09 2010-05-12 山西省电力公司电力科学研究院 Device and method for testing dielectric loss of high voltage transformer
CN202110271U (en) * 2011-05-06 2012-01-11 国网电力科学研究院 High-accuracy calibration device for load box of mutual inductor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316892A (en) * 2014-10-16 2015-01-28 内蒙古电力(集团)有限责任公司 Transformer load box calibration device
CN104316893A (en) * 2014-10-16 2015-01-28 内蒙古电力(集团)有限责任公司 Full-automatic calibration method of transformer load box
CN106772197A (en) * 2017-01-05 2017-05-31 云南电网有限责任公司电力科学研究院 Calibration device for load box of mutual inductor
CN106772197B (en) * 2017-01-05 2019-11-01 云南电网有限责任公司电力科学研究院 Calibration device for load box of mutual inductor
CN113702709A (en) * 2021-07-20 2021-11-26 中国电力科学研究院有限公司 Method for measuring resistance value of high-voltage arm of direct-current voltage transformer
CN113702709B (en) * 2021-07-20 2024-04-09 中国电力科学研究院有限公司 Method for measuring resistance value of high-voltage arm of direct-current voltage transformer

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Application publication date: 20120111