CN111965580A - Voltage transformer voltage coefficient series-parallel two-step measurement circuit and method - Google Patents

Voltage transformer voltage coefficient series-parallel two-step measurement circuit and method Download PDF

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CN111965580A
CN111965580A CN202010800199.1A CN202010800199A CN111965580A CN 111965580 A CN111965580 A CN 111965580A CN 202010800199 A CN202010800199 A CN 202010800199A CN 111965580 A CN111965580 A CN 111965580A
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voltage
voltage transformer
transformer
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insulating
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邵海明
张煌辉
王家福
赵伟
李传生
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National Institute of Metrology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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Abstract

The invention provides a voltage transformer voltage coefficient series-parallel two-step measurement circuit and a method thereof, belonging to the field of voltage transformer voltage coefficient measurement0Semi-insulating voltage transformer T1All-insulated voltage transformer T23Industrial frequency high voltage generator TDA two-stage inductive voltage divider IVD; all-insulated voltage transformer T23And semi-insulating voltage transformer T1After being connected in series or in parallel, the power frequency high-voltage generator TDConnecting; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; measured voltage transformer T0Primary and power frequency high voltage generator TDAnd (4) connecting. The invention has the advantages that: the process of measuring the voltage coefficient of the voltage transformer is simplified, compared with the traditional three-step method of series addition, the workload of the experimental process is reduced, and more importantly, the change of the secondary series and parallel state is correspondingly reducedThe inherent errors in the measurement vary, thereby significantly reducing the contribution to measurement uncertainty.

Description

Voltage transformer voltage coefficient series-parallel two-step measurement circuit and method
Technical Field
The invention relates to the field of voltage coefficient measurement of voltage transformers, in particular to a series-parallel two-step measurement circuit and a method for a proportional error voltage coefficient of a voltage transformer.
Background
In order to ensure fair trade of electric energy, a measuring transformer of a supply and utilization gateway needs to be metered and verified regularly. Therefore, the accurate magnitude of the standard voltage transformer has important significance for fair electric energy trade, accurate measurement of electric equipment and line loss. For example, the typical value of the power factor of a large-capacity air-core reactor is 0.001-0.004, and if the source tracing error of the loss measurement is less than 1%, the accuracy of the voltage proportion standard needs to be higher than 0.001%. In 2014, a set of 10kV to 10kV was developed by Chinese measurement science research institute
Figure BDA0002627098040000011
Class 0.0002 to class 0.001, voltage coefficient (2-5) × 10-6The voltage coefficient of the two-stage standard voltage transformer (comprising semi-insulation and full insulation) is evaluated by the voltage transformer series addition and high-voltage standard capacitor method (IEEE TIM,2015, 64 (6): 1381; Chinese patent No. ZL 201410483352.7).
A voltage coefficient measuring method of a voltage transformer is the key point of high-voltage proportion traceability research. In 1954, Forger and Zinn, German scholars, put forward the principle of "series-parallel addition of transformer voltages", i.e. a method of obtaining a new ratio by connecting two voltage transformers of a known ratio in series. In 1958, Zinn established a 120kV electromagnetic power frequency voltage proportion standard in a German PTB by adding 12 times from 100V by using the method, and the uncertainty is 1.2 multiplied by 10-5。
In 1991, a national high-voltage metering station is improved on the basis of ' mutual inductor series-parallel addition ', the research of ' series addition circuit based on all-insulated voltage mutual inductor ' is completed ' (Chinese invention patent No.: CN 90100301.8), a 110kV power frequency voltage proportion standard device in China is established, and the proportion uncertainty reaches 1 × 10-5(journal of metrology, 1992,13(3): 221).
Series connection based on all-insulation voltage transformerIn the research of a normal line, the influence of shield leakage generated by the change of the shield potential in three times of measurement on the error characteristic is relatively large, and the influence is further increased along with the increase of the voltage level. On the basis of developing a 1000kV series voltage transformer in the national high voltage metering station in 2009, a semi-insulating addition method (Chinese invention patent No. 201110185680.9) is provided, and the semi-insulating addition method is adopted for the high voltage metering station
Figure BDA0002627098040000021
The power frequency proportion standard is measured, the accuracy reaches 0.002 grade, and the uncertainty of measurement is reduced to 5 multiplied by 10-6(supply power, 2013, 30 (2): 71).
In 2013, the ' line and method for measuring voltage coefficient of a voltage transformer ' proposed by the institute of electrical science of the Guangdong electric network corporation ' is summarized as a ' single-stage transformer superposition principle measuring method ' (Chinese patent No. 201310154185.7), and it is described that a passive linear circuit is formed by two shielding type grounding voltage transformers with the same rated voltage ratio and an isolation transformer, and by utilizing the superposition of excitation and response of the linear circuit, the shielding errors of the voltage transformers forming the passive linear circuit are mutually offset in the superposition process, so that the influence of the shielding errors of the voltage transformers on a series addition line is overcome. However, the shielding structure and potential of the voltage transformer designed by different manufacturers are different, for example, the shielding potential of some fully insulated voltage transformers is at 1/2 high voltage rated potential, and the continuous point of the shielding potential is limited when the superposition principle is used, which may not be easy to implement.
As shown in fig. 3, 4 and 5, the series addition measurement measured transformer (T) based on the semi-insulating single-stage voltage transformer1) The voltage coefficient of (2) mainly comprises the following three comparative measurements: (1) semi-insulating mutual inductor T2And the tested mutual inductor T1Comparing and measuring to obtain1(ii) a (2) All-insulated mutual inductor T3Tested mutual inductor T1Comparing and measuring to obtain2(ii) a (3) Full-insulation mutual inductor and semi-insulation mutual inductor connected in series and then connected with tested mutual inductor T1Are measured by comparison3. Let T1、T2、T3The errors of the mutual inductor under the voltage U are respectively alpha (U), beta (U) and gamma (U); e.g. of the typeT2、eT3When the mutual inductors are connected in series for addition in the step (3), the mutual inductor T2And T3In series with T2、T3Errors introduced by different states when used individually;3for the assumption of mutual inductor T2And T3In series without e compared to aloneT2、eT3Under the condition of introducing extra errors, the transformer T is connected with a tested transformer1Comparing the measured errors, i.e.
Figure BDA0002627098040000022
Then there are:
1＝α(U)-β(U) (1)
2＝α(U)-γ(U) (2)
Figure BDA0002627098040000023
from formulae (1), (2) and (3):
Figure BDA0002627098040000031
in the existing mutual inductor series addition, the steps (1) and (2) are respectively independent T in the experiment2Or T3And T1Are compared to obtain1、2Without taking into account T2And T3Error e introduced by mutual influenceT2、eT3Whereas step (3) inevitably introduces eT2、eT3Thus, according to the formula
Figure BDA0002627098040000032
Calculating T1At voltage coefficient, eT2、eT3An influence will occur. Experiments show that the error increment e introduced by the imperfect shielding of the mutual inductor and the change of the working stateT2、eT3And the high voltage level of 110kV and above due to the larger nonlinearity of the single-stage mutual inductorIn the measurement of voltage coefficient of mutual inductor, 10 is obtained-6Measurement uncertainty of magnitude is difficult.
The Chinese invention patent with the application date of 2017.12.22 and the application number of CN201711406596.5 discloses a measuring circuit based on the superposition principle of a two-stage voltage transformer and a working method thereof, wherein the measuring circuit is respectively connected with a T-shaped transformer to be measured after primary windings and secondary windings of a full-insulation two-stage voltage transformer and a semi-insulation two-stage voltage transformer are respectively connected in series1Are measured by comparison3', although still introducing an error eT2、eT3However, by adjusting the prior art steps (1) (2) accordingly to "bring to calibration" step A, B, according to the formula
Figure BDA0002627098040000033
Calculating T1E introduced by imperfect shieldingT2、eT3The influence on the voltage coefficient measurement result caused by the imperfect shielding of the two voltage transformers connected in series in the voltage transformer series addition self-calibration is eliminated; because of the high precision requirement in the field of voltage coefficient measurement, even if the precision is improved by one stroke, the method has remarkable significance to the industry, and e of the patentT2、eT3Although the voltage coefficient is offset in the process of calculating the voltage coefficient, the voltage coefficient can be calculated only through three experimental steps, and the inherent error of a measuring system is introduced when the workload is increased by one more experimental step, so that the measurement uncertainty of the voltage coefficient is gradually accumulated and increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a voltage transformer voltage coefficient series-parallel two-step measurement circuit and a method, and further reducing the measurement uncertainty of the voltage transformer voltage coefficient.
On one hand, the invention provides a series-parallel two-step measurement circuit for voltage coefficients of a voltage transformer, which comprises a to-be-measured voltage transformer T0A semi-insulating voltage transformer T1A fully insulated voltage transformer T23One can providePower frequency high voltage generator T with half voltage outputDAnd a bi-level inductive voltage divider IVD; the measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23The rated transformation ratios of the transformer are all K;
the all-insulated voltage transformer T23And semi-insulating voltage transformer T1After being connected in series or in parallel, the power frequency high voltage generator TDConnecting; the all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; the measured voltage transformer T0Primary high-end and power frequency high-voltage generator TDConnecting; the measured voltage transformer T0And a semi-insulating voltage transformer T1The primary low side of (a) is grounded.
Further, the measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23Respectively a double-stage voltage transformer or a single-stage voltage transformer.
Further, the dual stage inductive voltage divider IVD is a precision dual stage inductive voltage divider, having two ratios of 0.5 and 1.
On the other hand, the invention provides a voltage transformer voltage coefficient series-parallel two-step measurement method, which needs to use the measurement circuit and comprises the following steps:
mutual inductor T for setting voltage to be measured0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23At power frequency high voltage generator TDThe output voltages at the applied voltage U are U0(U)、u1(U) and U23(U) the proportional errors α (U), β (U) and γ (U), respectively, are: α (U) ═ f0(U)+j·0(U) wherein f0(U) and0(U) representing a specific difference and an angular difference, respectively;
Figure BDA0002627098040000041
respectively representing all-insulated voltage transformers T23And semi-insulating electricityVoltage transformer T1Additional error introduced during secondary series connection;
step A:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in parallel with a power frequency high voltage generator TDConnected, power frequency high voltage generator TDOutputting a voltage U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting ratio K of two-stage inductive voltage divider IVDIVD0.5; by a transformer calibrator, a high-end difference measurement mode is used for measuring the voltage transformer T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure BDA0002627098040000042
Figure BDA0002627098040000051
Figure BDA0002627098040000052
Figure BDA0002627098040000053
Figure BDA0002627098040000054
And B:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in series with a power frequency high voltage generator TDConnecting; power frequency high voltage generator TDFor all-insulation voltage transformer T23And the voltage transformer T to be measured0Primary high end of the capacitor outputs 2U voltage, and the capacitor is fully insulatedVoltage transformer T23Primary low end and semi-insulating voltage transformer T1The primary high end of the voltage transformer outputs the voltage of U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting ratio K of two-stage inductive voltage divider IVD IVD1 is ═ 1; through the mutual inductor calibrator, a high-end difference measuring mode is used for measuring the voltage mutual inductor T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure BDA0002627098040000055
Figure BDA0002627098040000056
Figure BDA0002627098040000057
Figure BDA0002627098040000058
Figure BDA0002627098040000059
Thus, the voltage transformer T to be measured0The error variation from voltage U to 2U is:
Figure BDA00026270980400000510
the above formula shows that the compound has the advantages of,
Figure BDA00026270980400000511
may be at the above-mentioned T0The voltage variation in the calculation of the series-parallel two-step method is offset, which is the high accuracy of the inventionThe basis of the measurement.
Namely, a voltage transformer T0The variation amounts of the ratio difference and the angular difference from the voltage U to 2U are respectively:
Figure BDA0002627098040000061
by parity of reasoning, the tested voltage transformer T is obtained0 Slave voltage 2N-1U to 2NError variation of U
Figure BDA0002627098040000062
Wherein N is a positive integer;
the voltage coefficient curve is:
Figure BDA0002627098040000063
the invention has the advantages that:
by introducing the two-stage inductive voltage divider IVD, the all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD and then is connected with the tested voltage transformer T0The comparison measurement is carried out, and the measured voltage transformer T can be obtained only by two steps (step A and step B)0 Slave voltage 2 ofN-1U to 2NThe proportional error variance (voltage coefficient) of U, although introducing additional error
Figure BDA0002627098040000064
And
Figure BDA0002627098040000065
but cancel out during the calculation and the ratio K of the dual stage inductive divider IVDIVDThe proportional error of 0.5 and 1 is controlled to be small enough and can be ignored, compared with the traditional method that the voltage coefficient can be calculated through three steps, the workload of the experimental process is reduced, and simultaneously, the secondary windings of the full-insulation mutual inductor and the semi-insulation mutual inductor are kept in a series connection stateThe voltage transformer voltage coefficient measurement method has the advantages that the measurement is constant, inherent measurement error changes in the measurement experiment process are reduced, and the inherent measurement error changes can be offset in result calculation, so that the uncertainty of voltage transformer voltage coefficient measurement is further reduced.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a measuring principle circuit of a two-stage voltage transformer in the voltage transformer voltage coefficient series-parallel two-step measuring method of the invention.
Fig. 2 is a measuring principle circuit of a single-stage voltage transformer in the voltage transformer voltage coefficient series-parallel two-step measuring method of the invention.
Fig. 3 is a circuit based on the conventional voltage series addition principle of a semi-insulating single-stage transformer.
FIG. 4 shows T in series addition based on a semi-insulating single-stage mutual inductor1And T2The principle circuit is directly compared.
FIG. 5 shows T in series addition based on a conventional semi-insulating single-stage transformer1And T3The principle circuit is directly compared.
Detailed Description
The technical scheme in the embodiment of the application has the following general idea: by introducing the two-stage inductive voltage divider IVD, the fully insulated voltage transformer T is set in two steps, namely23And semi-insulating voltage transformer T1Primary and power frequency high voltage generator TDThe connection mode of the double-stage inductive voltage divider is set, the ratio value (0.5 or 1) of the IVD of the double-stage inductive voltage divider is set, and the power frequency high-voltage generator T is setDAnd then the output voltage of the two-stage inductive voltage divider IVD is measured to be connected with the voltage transformer T to be measured0The voltage difference between the proportional outputs of the voltage transformer T is obtained0 Slave voltage 2N-1U to 2NCompared with the traditional series addition, the error variation of the U is reduced by one experimental step, so that the uncertainty of the voltage coefficient measurement of the voltage transformer is further reduced.
Referring to fig. 1 to 5, a voltage transformer according to the present inventionThe preferred embodiment of the series-parallel two-step measurement circuit for the voltage coefficient of the device comprises a measured voltage transformer T0A semi-insulating voltage transformer T1A fully insulated voltage transformer T23A power frequency high voltage generator T capable of providing half voltage outputDAnd a bi-level inductive voltage divider IVD; the measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23The rated transformation ratios of the transformer are all K;
the all-insulated voltage transformer T23And semi-insulating voltage transformer T1After being connected in series or in parallel, the power frequency high voltage generator TDConnecting; the all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; the measured voltage transformer T0Primary high-end and power frequency high-voltage generator TDConnecting; the measured voltage transformer T0And a semi-insulating voltage transformer T1The primary low side of (a) is grounded.
The measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23Respectively a double-stage voltage transformer or a single-stage voltage transformer. I.e. the voltage transformer T to be measured0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23The single stage and the double stages of (A) can be combined randomly, for example, the voltage transformers can be both double stages, both single stage, T0Is a two-stage voltage transformer, T1And T23Being a single-stage voltage transformer or T0Is a single-stage voltage transformer, T1And T23The transformer is a combination of a two-stage voltage transformer and the like.
The all-insulated voltage transformer T23And semi-insulating voltage transformer T1After the secondary series connection, the secondary output cascade connection of the two-stage inductive voltage divider IVD specifically comprises:
when the all-insulated voltage transformer T23And semi-insulating voltage transformer T1When the transformer is a two-stage voltage transformer, the two after series connectionThe secondary proportional output is connected with the proportional input of the two-stage inductive voltage divider IVD, and the secondary excitation output is connected with the excitation input of the two-stage inductive voltage divider IVD; when the all-insulated voltage transformer T23And semi-insulating voltage transformer T1When the voltage transformer is a single-stage voltage transformer, the secondary output after series connection is simultaneously connected with the proportion and excitation input of the double-stage inductive voltage divider IVD.
The double-stage inductive voltage divider IVD is a precise double-stage inductive voltage divider.
The invention discloses a preferred embodiment of a series-parallel two-step measurement method for voltage coefficients of a voltage transformer, which comprises the following steps of:
mutual inductor T for setting voltage to be measured0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23At power frequency high voltage generator TDThe output voltages at the applied voltage U are U0(U)、u1(U) and U23(U) the proportional errors α (U), β (U) and γ (U), respectively, are: α (U) ═ f0(U)+j·0(U) wherein f0(U) and0(U) representing a specific difference and an angular difference, respectively;
Figure BDA0002627098040000081
respectively representing all-insulated voltage transformers T23And a semi-insulating voltage transformer T1Additional error introduced during secondary series connection;
step A:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in parallel with a power frequency high voltage generator TDConnected, power frequency high voltage generator TDOutputting a voltage U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting ratio K of two-stage inductive voltage divider IVDIVD0.5; by a transformer calibrator, a high-end difference measurement mode is used for measuring the voltage transformer T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure BDA0002627098040000082
Figure BDA0002627098040000083
Figure BDA0002627098040000091
Figure BDA0002627098040000092
Figure BDA0002627098040000093
Wherein U isrefRepresents a reference voltage;
and B:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in series with a power frequency high voltage generator TDConnecting; power frequency high voltage generator TDFor all-insulation voltage transformer T23And the voltage transformer T to be measured0The primary high end of the transformer outputs 2U voltage to a full-insulation voltage transformer T23Primary low end and semi-insulating voltage transformer T1The primary high end of the voltage transformer outputs the voltage of U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting ratio K of two-stage inductive voltage divider IVD IVD1 is ═ 1; through the mutual inductor calibrator, a high-end difference measuring mode is used for measuring the voltage mutual inductor T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure BDA0002627098040000094
Figure BDA0002627098040000095
Figure BDA0002627098040000096
Figure BDA0002627098040000097
Figure BDA0002627098040000098
Thus, the voltage transformer T to be measured0The error variation from voltage U to 2U is:
Figure BDA0002627098040000099
the above formula shows that beta (U) and gamma (U) and
Figure BDA00026270980400000910
may be at the above-mentioned T0The voltage variation in the series-parallel two-step method is offset in the calculation, which is the basis for realizing high-accuracy measurement.
Namely, a voltage transformer T0The variation amounts of the ratio difference and the angular difference from the voltage U to 2U are respectively:
Figure BDA0002627098040000101
by parity of reasoning, the tested voltage transformer T is obtained0 Slave voltage 2N-1U to 2NError variation of U
Figure BDA0002627098040000102
Wherein N is a positive integer;
the voltage coefficient curve is:
Figure BDA0002627098040000103
in summary, the invention has the advantages that:
by introducing the two-stage inductive voltage divider IVD, the all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD and then is connected with the tested voltage transformer T0The comparison measurement is carried out, and the measured voltage transformer T can be obtained only by two steps (step A and step B)0 Slave voltage 2 ofN-1U to 2NThe proportional error variance (voltage coefficient) of U, although introducing additional error
Figure BDA0002627098040000104
And
Figure BDA0002627098040000105
but cancel out during the calculation and the ratio K of the dual stage inductive divider IVDIVDThe proportional error of 0.5 and 1 can be controlled to be small enough and can be ignored, compared with the traditional method that the voltage coefficient can be calculated through three steps, the working amount in the experimental process is reduced, and simultaneously, because the secondary windings of the full-insulated voltage transformer and the semi-insulated voltage transformer are kept to be always kept in a series connection state, the change of inherent measurement errors in the measurement experimental process is reduced, the inherent measurement errors can be offset in the result calculation, and the uncertainty of the voltage coefficient measurement of the voltage transformer is further reduced.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims (4)

1. Voltage sourceMutual-inductor voltage coefficient series-parallel connection two-step measurement circuit, its characterized in that: comprises a voltage transformer T to be measured0A semi-insulating voltage transformer T1A fully insulated voltage transformer T23A power frequency high voltage generator T capable of providing half voltage outputDAnd a bi-level inductive voltage divider IVD; the measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23The rated transformation ratios of the transformer are all K;
the all-insulated voltage transformer T23And semi-insulating voltage transformer T1After being connected in series or in parallel, the power frequency high voltage generator TDConnecting; the all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; the measured voltage transformer T0Primary high-end and power frequency high-voltage generator TDConnecting; the measured voltage transformer T0And a semi-insulating voltage transformer T1The primary low side of (a) is grounded.
2. The series-parallel two-step measurement circuit of the voltage coefficient of the voltage transformer as claimed in claim 1, wherein: the measured voltage transformer T0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23Respectively a double-stage voltage transformer or a single-stage voltage transformer.
3. The series-parallel two-step measurement circuit of the voltage coefficient of the voltage transformer as claimed in claim 1, wherein: the two-stage inductive voltage divider IVD is a precision two-stage inductive voltage divider with two ratios of 0.5 and 1.
4. A series-parallel two-step measurement method for voltage coefficients of a voltage transformer is characterized by comprising the following steps of: the method requires the use of a measuring circuit according to any of claims 1 to 3, comprising the following steps:
mutual inductor T for setting voltage to be measured0Semi-insulating voltage transformer T1And a fully insulated voltage transformer T23At power frequency high voltage generator TDThe output voltages at the applied voltage U are U0(U)、u1(U) and U23(U) the proportional errors α (U), β (U) and γ (U), respectively, are: α (U) ═ f0(U)+j·0(U) wherein f0(U) and0(U) representing a specific difference and an angular difference, respectively;
Figure FDA0002627098030000011
respectively representing all-insulated voltage transformers T23And a semi-insulating voltage transformer T1Additional error introduced during secondary series connection;
step A:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in parallel with a power frequency high voltage generator TDConnected, power frequency high voltage generator TDOutputting a voltage U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting the ratio K of a two-stage inductive voltage divider IVDIVD0.5; by a transformer calibrator, a high-end difference measurement mode is used for measuring the voltage transformer T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure FDA0002627098030000021
Figure FDA0002627098030000022
Figure FDA0002627098030000023
Figure FDA0002627098030000024
Figure FDA0002627098030000025
And B:
all-insulated voltage transformer T23And semi-insulating voltage transformer T1Is connected in series with a power frequency high voltage generator TDConnecting; power frequency high voltage generator TDFor all-insulation voltage transformer T23And the voltage transformer T to be measured0The high end of the primary series connection outputs 2U voltage to a full-insulation voltage transformer T23Primary low end and semi-insulating voltage transformer T1The primary high end of the voltage transformer outputs the voltage of U; all-insulated voltage transformer T23And semi-insulating voltage transformer T1The secondary output is cascaded with the two-stage inductive voltage divider IVD; setting ratio K of two-stage inductive voltage divider IVDIVD1 is ═ 1; through the mutual inductor calibrator, a high-end difference measuring mode is used for measuring the voltage mutual inductor T0The excitation output of the sensor is used as a reference, and the output of the two-stage inductive voltage divider IVD and the measured voltage transformer T are measured0Voltage difference between the proportional outputs of
Figure FDA0002627098030000026
Figure FDA0002627098030000027
Figure FDA0002627098030000028
Figure FDA0002627098030000029
Figure FDA0002627098030000031
Thus, the voltage transformer T to be measured0The error variation from voltage U to 2U is:
Figure FDA0002627098030000032
the above formula shows that beta (U) and gamma (U) and
Figure FDA0002627098030000033
and
Figure FDA0002627098030000034
may be at the above-mentioned T0The voltage variation in the series-parallel two-step method is offset in the calculation, which is the basis for realizing high-accuracy measurement.
Namely, a voltage transformer T0The variation amounts of the ratio difference and the angular difference from the voltage U to 2U are respectively:
Figure FDA0002627098030000035
by parity of reasoning, the tested voltage transformer T is obtained0Slave voltage 2N-1U to 2NError variation of U
Figure FDA0002627098030000036
Wherein N is a positive integer;
the voltage coefficient curve is:
Figure FDA0002627098030000037
CN202010800199.1A 2020-08-11 2020-08-11 Voltage transformer voltage coefficient series-parallel two-step measurement circuit and method Pending CN111965580A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117949886A (en) * 2024-03-27 2024-04-30 国网山西省电力公司营销服务中心 Intelligent regulation and control method and system for transformer calibrator, electronic equipment and storage medium
CN117949886B (en) * 2024-03-27 2024-07-05 国网山西省电力公司营销服务中心 Intelligent regulation and control method and system for transformer calibrator, electronic equipment and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117949886A (en) * 2024-03-27 2024-04-30 国网山西省电力公司营销服务中心 Intelligent regulation and control method and system for transformer calibrator, electronic equipment and storage medium
CN117949886B (en) * 2024-03-27 2024-07-05 国网山西省电力公司营销服务中心 Intelligent regulation and control method and system for transformer calibrator, electronic equipment and storage medium

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