CN101493509B - Verifying apparatus for measuring extra-high voltage transformer error - Google Patents

Verifying apparatus for measuring extra-high voltage transformer error Download PDF

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Publication number
CN101493509B
CN101493509B CN2009100605107A CN200910060510A CN101493509B CN 101493509 B CN101493509 B CN 101493509B CN 2009100605107 A CN2009100605107 A CN 2009100605107A CN 200910060510 A CN200910060510 A CN 200910060510A CN 101493509 B CN101493509 B CN 101493509B
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voltage
standard
voltage transformer
calibration equipment
capacitance
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CN101493509A (en
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王乐仁
雷民
章述汉
周峰
郑汉军
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Wuhan NARI Ltd
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
State Grid Electric Power Research Institute
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State Grid Electric Power Research Institute
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Abstract

The invention provides a calibration device used for error measurement of a super-high voltage transformer, comprising an admittance network consisting of a standard capacitance box and a standard conductive box, a precise voltage divider, an induction-typed shunt and a null instrument. The calibration device can be used as the error measurement device when the voltage transformer is being calibrated by the capacitance-typed voltage proportion standard, adopts the difference value measurement principle to calibrate the ratio difference and the phase difference of the voltage transformer to be tested, realizes directly reading the ratio difference and phase difference of the voltage transformer to be calibrated by the conductivity quantity and capacitance quantity of the admittance network, and can calibrate the electromagnetism-typed or capacitance-typed voltage transformer within the voltage range of 110-1000KV. When calibrating the voltage transformer used for the measurement with the accuracy class of 0.05 or above, the uncertainty introduced by the calibration device is less than or equal to 5.3*10<-6> and when calibrating the voltage transformer used for the power with the accuracy class of 0.05 or above, the uncertainty introduced by the calibration device is less than or equal to 2.3*10<-5>.

Description

A kind of calibration equipment that is used for measuring extra-high voltage transformer error
Technical field
The present invention relates to a kind of voltage transformer error calibration equipment, particularly a kind of calibration equipment that is used for the measurement of extra-high voltage (1000kV and above electric pressure) voltage transformer error.
Background technology
Construction and extra-high voltage continuous advancement in technology along with UHV (ultra-high voltage) and extra-high voltage grid; All require accurate measuring voltage value in various aspects such as the test of High-Voltage Technology research, high-voltage large current equipment and research, critical point metering, the assessment of power transmission and transforming equipment technical merit, line parameter circuit value measurements, the demand of therefore carrying out 1000kV extra-high voltage magnitude tracing and transmission of quantity value work is particularly urgent.Because China does not set up (single-phase rated voltage in the extra-high voltage grid) power-frequency voltage ratio standard as yet; The error checking of extra-high voltage transformer (comprising electromagnetic potential transformer TV and capacitance type potential transformer CVT) can only be transmission standard (also claiming the capacitor voltage ratio standard) through standard capacitor at present, is traceable to the highest the national power-frequency voltage ratio standard of present domestic electric pressure.Current measuring methods is a constant power capacitance bridge method, and measuring circuit is seen Fig. 1, and wherein error measuring means adopts comparator type high-voltage capacitance electric bridge QS.But not enough below this method exists: the reading of 1, measuring is capacitance ratio C X/ C NWith dielectric loss tg δ, need carry out just obtaining behind the mathematical conversion ratio difference and the phase differential of mutual inductor, use very inconvenient, and having relatively high expectations to survey crew; When 2, measuring the 1000kV voltage transformer (VT), standard capacitor rated capacitance C NThe general 50pF that selects, then the electric current of input capacitance electric bridge QS has tens milliamperes, and the maximum permission input current 10mA greater than general comparator type high-voltage capacitance electric bridge QS possibly cause measuring fault, even damage capacitance bridge QS; 3, comparator type high-voltage capacitance electric bridge QS is owing to used the electronic circuit conversion, and its measuring error has non-linear, has increased Measurement Uncertainty; 4, constant power capacitance bridge measuring circuit belongs to direct comparison expression measuring principle rather than difference measuring principle, and anti-interference is relatively poor relatively, is not suitable for the abominable in-site measurement of electromagnetic environment.For convenience and the reliability that improves the extra-high voltage magnitude tracing, guarantee the consistance of national extra-high voltage value, be badly in need of design new error checking arrangement and method of calibration, to satisfy present extra-high voltage transformer verification requirements of one's work.
Summary of the invention
The objective of the invention is: improve to the constant power capacitance bridge method calibration potential transformator that adopts the at present especially deficiency of 1000kV voltage transformer (VT); A kind of calibration equipment that is used for measuring extra-high voltage transformer error is provided; In with the process of condenser type voltage ratio standard calibration potential transformator,, the ratio difference and the phase differential of tested voltage transformer (VT) carried out verification as error measuring means.0.05 grade of verification and above accuracy grade are measured when using voltage transformer (VT), by uncertainty≤5.3 * 10 of calibration equipment introducing of the present invention -6, when 0.5 grade of verification and above accuracy grade electric power are used voltage transformer (VT), by uncertainty≤2.3 * 10 of calibration equipment introducing of the present invention -5, all satisfy the requirement of existing vertification regulation " measure with voltage ct calibrating rules JJG314-94 ", thereby condition and guarantee be provided for the pin-point accuracy verification work of 1000kV voltage transformer (VT).
Technical scheme of the present invention is: a kind of calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: comprise accurate voltage divider, standard capacitance box, standard electric guide box, zero indicator and induction type shunt; Standard capacitance box and standard electric guide box are formed the admittance network; Accurate voltage divider and admittance combination of network provide standard elementary errors current signal to inject the pontic balance node; Low-voltage standards capacitor injection current is to the pontic balance node; The electric current of high voltage standard capacitor injects the pontic balance node through induction type shunt shunting back, connects zero indicator between pontic balance node and the ground.
The aforesaid calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: the resistance of standard capacitance box is the power-type precision resistance of low voltage coefficient, low dielectric loss, and its accuracy is superior to 0.2%, dielectric loss≤1 * 10 -4The resistance of standard electric guide box is the power-type precision resistance of low-temperature coefficient, low distribution parameter, and its accuracy is superior to 0.2%.
The aforesaid calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: the admittance network realizes that through some multitool multi-position switchs decimal system value switches multitool multi-position switch contact resistance<2m Ω.
The aforesaid calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: accurate voltage divider is a twin-stage mutual inductor structure, and by annular silicon steel sheet core and annular alloy-iron core coiling, its accuracy is superior to 0.01%.
The aforesaid calibration equipment that is used for measuring extra-high voltage transformer error; It is characterized in that: the induction type shunt is a multilevel hierarchy; Switch any diverting coefficient in 0~1.111110 scope of realization, error≤2 * 10 when the first switch-board positional number is non-vanishing through six multitool multi-position switchs -6
The aforesaid calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: zero indicator is made up of multistage electronic amplification circuit, realizes that minimum resolution voltage is 0.5 μ V/ lattice, and harmonic wave suppresses ability>60dB more than three times.
Beneficial effect of the present invention: (1) can directly be read the error of tested mutual inductor through the present invention during with condenser type power-frequency voltage ratio standard verification electromagnetic potential transformer or capacitance type potential transformer, has improved convenience and the reliability measured; (2) the present invention adopts the difference measuring principle, has improved the anti-interference of measuring, and has reduced the performance requirement to components and parts simultaneously; (3) pontic circuit of the present invention is all selected electronic parts for use; Avoided the non-linear and easy saturability that uses electronic circuit to introduce; Improve maximum permission input current (greater than 30mA), thereby reduced the uncertainty of measurement of introducing by the calibration equipment of error measure itself.
Description of drawings
Fig. 1 is the measurement circuit of constant power capacitance bridge method verification electromagnetic potential transformer or capacitance type potential transformer.
Fig. 2 is the measurement circuit that adopts embodiment of the invention difference measuring principle verification electromagnetic potential transformer or capacitance type potential transformer.
Fig. 3 is the fundamental diagram of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the calibration equipment that the present invention is used for measuring extra-high voltage transformer error is done further explanation.
The tested voltage transformer (VT) of the explanation of mark: Tx-among Fig. 1; U 1The primary side voltage of-tested voltage transformer (VT); U 2The secondary side voltage of-tested voltage transformer (VT); The QS-capacitance bridge; E-housing ground; C 1-high voltage standard capacitor; C 2-low-voltage standards capacitor.
The explanation of mark among Fig. 2: the HJ-embodiment of the invention.
The explanation of mark among Fig. 3: 1, the accurate voltage divider of 2-; The 3-standard capacitance box; 4-standard electric guide box; 5-admittance network; The 6-balance node; The 7-zero indicator; 8-induction type shunt; 9-low-voltage standards capacitor is (with C among Fig. 1 2); The 10-high voltage standard capacitor is (with C among Fig. 1 1); I 1, I 2-electric current; Δ I S-standard elementary errors current signal;
The transformation ratio of accurate voltage divider 1,2 is designated as K respectively 1, K 2, the electric capacity of standard capacitance box 3 is designated as C, and the conductance of standard electric guide box 4 is designated as G, and the diverting coefficient of induction type shunt 8 is designated as K 3, the electric capacity of low-voltage standards capacitor 9 is designated as C 2, the electric capacity of high voltage standard capacitor 10 is designated as C 1, electric current I 1, I 2It is respectively the electric current that pontic balance node 6 is injected in high voltage standard capacitor 10, low-voltage standards capacitor 9 loops.
As shown in Figure 3, the embodiment of the invention comprises accurate voltage divider 1,2, standard capacitance box 3, standard electric guide box 4, zero indicator 7 and induction type shunt 8; Standard capacitance box 3 is formed admittance network 5 with standard electric guide box 4, realizes that through some multitool multi-position switchs decimal system value switches; Accurate voltage divider 1,2 and 5 combinations of admittance network provide standard elementary errors current signal Δ I SInject pontic balance node 6; Low-voltage standards capacitor 9 injection currents are to pontic balance node 6; The electric current of high voltage standard capacitor 10 to pontic balance node 6, connects zero indicator 7 through induction type shunt 8 shunting back injection currents between pontic balance node 6 and the ground.
Said standard capacitance box 3 is the power-type precision resistance of low voltage coefficient, low dielectric loss, and its accuracy is superior to 0.2%, dielectric loss≤1 * 10 -4Said standard electric guide box 4 is the power-type precision resistance of low-temperature coefficient, low distribution parameter, and its accuracy is superior to 0.2%; Said multitool multi-position switch contact resistance<2m Ω.Said accurate voltage divider 1,2 is a twin-stage mutual inductor structure, by annular silicon steel sheet core and annular alloy-iron core coiling, realizes the dividing potential drop of a plurality of transformation ratios, and its accuracy is superior to 0.01%; Induction type shunt 8 is used for expanded range; Make the embodiment of the invention can satisfy the verification requirement of voltage transformer (VT) in 110kV~1000kV scope simultaneously; Induction type shunt 8 is a multilevel hierarchy; Switch any diverting coefficient in 0~1.111110 scope of realization, error≤2 * 10 when the first switch-board positional number is non-vanishing through six multitool multi-position switchs -6Zero indicator 7 is used for the balance indication of pontic circuit, and zero indicator 7 is made up of multistage electronic amplification circuit, realizes that minimum resolution voltage is 0.5 μ V/ lattice, and harmonic wave suppresses ability>60dB more than three times.
Standard elementary errors current signal Δ I SIt is a vector signal that the amplitude phase place is adjustable.When regulating admittance network 5, can change standard elementary errors current signal Δ I SAmplitude and phase place, be used for the electric current I that balance high voltage standard capacitor 10, low-voltage standards capacitor 9 loops inject pontic balance node 6 1, I 2The difference between current that produces; When pontic circuit (part among Fig. 3 except that zero indicator 7) balance; Zero indicator 7 nullings, the electric capacity C of the standard capacitance box 3 through admittance network 5 and the conductance G reading of standard electric guide box 4 can obtain ratio difference and the phase differential of tested voltage transformer (VT) Tx.
In measurement circuit shown in Figure 2, the ratio difference of remembering tested voltage transformer (VT) Tx is f, and phase differential is δ, and specified transformation ratio is K n, then the error by mutual inductor defines, U &CenterDot; 1 = - K n U &CenterDot; 2 ( 1 - f - J&delta; ) .
In fundamental diagram shown in Figure 3, the electric current that balance node 6 is injected in high voltage standard capacitor 10, low-voltage standards capacitor 9 loops is: I &CenterDot; 2 = U &CenterDot; 2 w C 2 j , I &CenterDot; 1 = U &CenterDot; 1 w C 1 j = - K 3 K n U &CenterDot; 2 ( 1 - f - J&delta; ) w C 1 j . Make up the standard elementary errors current signal that provides by admittance network 5 and accurate voltage divider 1,2 &Delta; I &CenterDot; S = U &CenterDot; 2 WCj / ( 2 K 1 ) + K 2 U &CenterDot; 2 G / ( 2 K 1 ) . Regulate the diverting coefficient K of induction type shunt 8 3Make it satisfy K 3K n=C 2/ C 1By the bridge balance principle, when zero indicator 7 nullings, satisfy: I &CenterDot; 1 + I &CenterDot; 2 + &Delta; I &CenterDot; S = 0 , With I 1, I 2, Δ I SExpression formula substitution following formula arrangement after obtain: ( - f - J&delta; ) w C 2 j = w 2 K 1 Cj + K 2 2 K 1 G , Order: w=100 π, solve an equation and can obtain: &delta; = K 2 G 2 w C 2 K 1 &times; 3438 &prime; , f = - C 2 K 1 C 2 .
In order to make tester ability direct-reading error, get K 1=1000, K 2=0.9138, C 2=50nF, the then reading of standard capacitance box 3 (unit: uF) be ratio difference, the reading of standard electric guide box 4 (unit: 10 -5S) be phase differential (unit: ').Work as C 1During=50pF, by K 3K n=C 2/ C 1: K n=C 2/ (C 1K 3), K 3Variation range when the first switch-board positional number that guarantees induction type shunt 8 is non-vanishing is: 0.1~1.11111, so K nVariation range be: 900~10000, therefore can satisfy the verification requirement of 110kV~1000kV range of voltages voltage gradation mutual inductor transformation ratio.

Claims (6)

1. a calibration equipment that is used for measuring extra-high voltage transformer error is characterized in that: comprise accurate voltage divider, standard capacitance box, standard electric guide box, zero indicator and induction type shunt; Standard capacitance box and standard electric guide box are formed the admittance network; Accurate voltage divider and admittance combination of network provide standard elementary errors current signal to inject the pontic balance node; Low-voltage standards capacitor injection current is to the pontic balance node; The electric current of high voltage standard capacitor injects the pontic balance node through induction type shunt shunting back, connects zero indicator between pontic balance node and the ground.
2. the calibration equipment that is used for measuring extra-high voltage transformer error according to claim 1; It is characterized in that: the resistance of standard capacitance box is the power-type precision resistance of low voltage coefficient, low dielectric loss; Its accuracy is superior to 0.2%, dielectric loss≤1 * 10 -4The resistance of standard electric guide box is the power-type precision resistance of low-temperature coefficient, low distribution parameter, and its accuracy is superior to 0.2%.
3. the calibration equipment that is used for measuring extra-high voltage transformer error according to claim 1 is characterized in that: the admittance network realizes that through some multitool multi-position switchs decimal system value switches multitool multi-position switch contact resistance<2m Ω.
4. the calibration equipment that is used for measuring extra-high voltage transformer error according to claim 1 is characterized in that: accurate voltage divider is a twin-stage mutual inductor structure, and by annular silicon steel sheet core and annular alloy-iron core coiling, its accuracy is superior to 0.01%.
5. the calibration equipment that is used for measuring extra-high voltage transformer error according to claim 1; It is characterized in that: the induction type shunt is a multilevel hierarchy; Switch any diverting coefficient in 0~1.111110 scope of realization, error≤2 * 10 when the first switch-board positional number is non-vanishing through six multitool multi-position switchs -6
6. the calibration equipment that is used for measuring extra-high voltage transformer error according to claim 1 is characterized in that: zero indicator is made up of multistage electronic amplification circuit, realizes that minimum resolution voltage is 0.5 μ V/ lattice, and harmonic wave suppresses ability>60dB more than three times.
CN2009100605107A 2009-01-13 2009-01-13 Verifying apparatus for measuring extra-high voltage transformer error Active CN101493509B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101988958A (en) * 2009-08-07 2011-03-23 华东电力试验研究院有限公司 Checking device and checking method of accuracy of capacitor voltage transformer
CN101872007B (en) * 2010-06-10 2012-12-26 江西省电力科学研究院 Calibration method of three-phase voltage transformer based on voltage transformer load error curve extrapolation
CN103543429A (en) * 2012-07-13 2014-01-29 湖北天瑞电子有限公司 Micro current transformer calibrator
CN103472273B (en) * 2013-09-11 2016-02-03 国家电网公司 Electronic type voltage transformer standard and electronic type voltage transformer verification structure
CN103983828B (en) * 2014-05-26 2016-09-07 国家电网公司 A kind of Electrical Instrument Transducers with Digital phase compensating method
CN105137378B (en) * 2015-08-14 2018-11-09 中国电力科学研究院 A kind of 2/1 intrinsic standoff ratio method for self-calibrating of divider

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2280919Y (en) * 1996-11-09 1998-05-06 何排枝 Integrated mutual-inductor calibration device
RU2274871C2 (en) * 2003-08-07 2006-04-20 Дмитрий Иванович Нефедьев Device for calibration testing of voltage transformers
CN101074988A (en) * 2007-07-20 2007-11-21 太原市优特奥科电子科技有限公司 Method and apparatus for realtime and on-line monitoring meter error of high-voltage mutual inductor
CN201373913Y (en) * 2009-01-13 2009-12-30 国网电力科学研究院 Calibrating device for measuring errors for extra high-voltage voltage transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2280919Y (en) * 1996-11-09 1998-05-06 何排枝 Integrated mutual-inductor calibration device
RU2274871C2 (en) * 2003-08-07 2006-04-20 Дмитрий Иванович Нефедьев Device for calibration testing of voltage transformers
CN101074988A (en) * 2007-07-20 2007-11-21 太原市优特奥科电子科技有限公司 Method and apparatus for realtime and on-line monitoring meter error of high-voltage mutual inductor
CN201373913Y (en) * 2009-01-13 2009-12-30 国网电力科学研究院 Calibrating device for measuring errors for extra high-voltage voltage transformer

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Inventor after: Lei Min

Inventor after: Zheng Hanjun

Inventor after: Chen Ying

Inventor after: Zhou Feng

Inventor after: Wang Leren

Inventor after: Zhang Shuhan

Inventor after: Yang Lin

Inventor after: Fan Songhai

Inventor after: Chen Hui

Inventor after: Tang Ping

Inventor before: Wang Leren

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Effective date of registration: 20170406

Address after: 210000 Jiangning economic and Technological Development Zone, Jiangsu, Shengli Road, No. 9, No.

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