WO2023029716A1 - Procédé et système de mesure de haute précision pour transformateur de tension - Google Patents

Procédé et système de mesure de haute précision pour transformateur de tension Download PDF

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Publication number
WO2023029716A1
WO2023029716A1 PCT/CN2022/103131 CN2022103131W WO2023029716A1 WO 2023029716 A1 WO2023029716 A1 WO 2023029716A1 CN 2022103131 W CN2022103131 W CN 2022103131W WO 2023029716 A1 WO2023029716 A1 WO 2023029716A1
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voltage transformer
error
voltage
under test
load
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PCT/CN2022/103131
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English (en)
Chinese (zh)
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邓兴宏
何静
李刚
徐锋
马丁
欧希桥
黄滔
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中广核工程有限公司
中国广核集团有限公司
中国广核电力股份有限公司
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Publication of WO2023029716A1 publication Critical patent/WO2023029716A1/fr

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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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  • the invention relates to the technical field of high-voltage transformer testing, and more specifically, relates to a high-precision measuring method and system for a voltage transformer.
  • the distance between the main transformer of the second phase and the switch station (the first phase of construction is completed) is longer, and the length of the GIS and GIL busbars between the two is changed from a maximum of 459 meters in the first phase to the transformer
  • the distributed capacitance to the ground of the GIL and GIS buses has increased significantly, and the field test wiring is in the high-voltage profile channel, and the electromagnetic interference is serious and difficult to eliminate.
  • the precision measurement of the voltage transformer inside the GIS for this circuit The capacity of the step-up test transformer will be greatly increased. Due to the limited capacity of the field test power supply, it cannot meet the test requirements.
  • the existing GIS internal voltage transformer test method due to the small external error, the measured test data can basically meet the test standard requirements under the condition of including the error, but in the expansion project, due to factors such as long distance and strong interference , resulting in a very large external error, which will cause the test data to fail to meet the standard requirements.
  • the technical problem to be solved by the present invention is to provide a high-precision measurement method and system for a voltage transformer in view of the above-mentioned defects of the prior art.
  • construct a kind of voltage transformer high-precision measurement method comprise the following steps:
  • the acquisition of the systematic error of the measurement system includes:
  • the systematic error of the measurement system is calculated to obtain the systematic error of the measurement system.
  • the measurement system includes: a power controller, a conversion unit, a resonant device, a standard voltage transformer, a voltage transformer under test, and an error measurement device;
  • the power controller, the conversion unit and the resonant device are connected in sequence, the input end of the standard voltage transformer is connected to the resonant device, and the output end of the standard voltage transformer is connected to the error measuring device , one end of the voltage transformer under test is connected to the resonance device, and the other end is connected to the error measurement device;
  • the power controller is used to input power and output voltage signals to the conversion unit according to the set parameters
  • the conversion unit is used to convert the voltage signal and output it to the resonance device;
  • the resonant device is used for tuning control
  • the error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
  • the conversion unit includes: an excitation transformer;
  • the primary winding of the excitation transformer is connected to the output terminal of the power controller, and the secondary winding of the excitation transformer is connected to the input terminal of the resonance device.
  • the resonance device includes: a sense-tuning reactor, an adjustable reactor, and a fixed reactor;
  • the first end of the shunt reactor is connected to the output end of the excitation transformer, the second end of the shunt reactor is connected to the standard voltage transformer and the measured voltage transformer, and the adjustable reactor and the fixed reactor are sequentially connected in parallel with the shunt reactor.
  • the high-precision measuring method for a voltage transformer further includes: the voltage transformer under test and a load box for providing load to the voltage transformer under test.
  • the system error includes: a system error of the measured voltage transformer and a system error of a standard voltage transformer;
  • the system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
  • the first system error is: when the load box is at rated load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device;
  • the second system error is: when the load box is at the lower limit load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device;
  • the third systematic error is: when the load box is under no load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device.
  • the calculation of the systematic error of the measurement system, and obtaining the systematic error of the measurement system include:
  • the first systematic error is obtained according to the rated admittance of the load box and the rated measured resistance value of the voltage transformer under test.
  • the first systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the voltage transformer under test to the error measuring device; Y1 is the rated admittance of the load box.
  • the rated admittance of the load box is obtained by the following formula:
  • Y1 is the rated admittance of the load box; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the calculation of the systematic error of the measurement system, and obtaining the systematic error of the measurement system include:
  • the second systematic error is obtained according to the lower limit admittance of the load box and the lower limit measured resistance value of the measured voltage transformer.
  • the second systematic error is obtained by the following formula
  • r is the lead wire resistance from the secondary terminal of the voltage transformer under test to the error measuring device; Y2 is the lower limit admittance of the load box.
  • the lower limit admittance of the load box is obtained by the following formula:
  • Y 2 is the lower limit admittance of the load box; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the present invention also provides a high-precision measurement system for a voltage transformer, including: a power controller, a conversion unit, a resonant device, a standard voltage transformer, a voltage transformer to be tested, and an error measuring device;
  • the power controller, the conversion unit and the resonant device are connected in sequence, the input end of the standard voltage transformer is connected to the resonant device, and the output end of the standard voltage transformer is connected to the error measuring device , one end of the voltage transformer under test is connected to the resonance device, and the other end is connected to the error measurement device;
  • the power controller is used to input power and output voltage signals to the conversion unit according to the set parameters
  • the conversion unit is used to convert the voltage signal and output it to the resonance device;
  • the resonant device is used for tuning control
  • the error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
  • the conversion unit includes: an excitation transformer;
  • the primary winding of the excitation transformer is connected to the output terminal of the power controller, and the secondary winding of the excitation transformer is connected to the input terminal of the resonance device.
  • the resonance device includes: a sense-tuning reactor, an adjustable reactor, and a fixed reactor;
  • the first end of the shunt reactor is connected to the output end of the excitation transformer, the second end of the shunt reactor is connected to the standard voltage transformer and the measured voltage transformer, and the adjustable reactor and the fixed reactor are sequentially connected in parallel with the shunt reactor.
  • the high-precision measuring method for a voltage transformer further includes: the voltage transformer under test and a load box for providing load to the voltage transformer under test.
  • the system error includes: a system error of the measured voltage transformer and a system error of a standard voltage transformer;
  • the system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
  • the first system error is: when the load box is at rated load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device;
  • the second system error is: when the load box is at the lower limit load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device;
  • the third systematic error is: when the load box is under no load, the error caused by the voltage drop from the secondary terminal of the voltage transformer under test to the lead wire of the error measuring device.
  • the first systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the voltage transformer under test to the error measuring device; Y1 is the rated admittance of the load box.
  • the rated admittance of the load box is obtained by the following formula:
  • Y1 is the rated admittance of the load box; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the second system error is obtained by the following formula
  • r is the lead wire resistance from the secondary terminal of the voltage transformer under test to the error measuring device; Y2 is the lower limit admittance of the load box.
  • the lower limit admittance of the load box is obtained by the following formula:
  • Y 2 is the lower limit admittance of the load box; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • Implementing the voltage transformer high-precision measurement method and system of the present invention has the following beneficial effects: the following steps are included: obtaining the systematic error of the measurement system; performing series resonance on the measurement system by means of low-voltage frequency modulation resonance to obtain a resonance frequency point; Calculate the resonant inductance at the frequency point; adjust the resonant equipment according to the resonant inductance, so that the power frequency resonance of the measurement system is boosted; when the power frequency resonance of the measurement system is boosted, the accuracy data of the measured voltage transformer is obtained; according to System error and accuracy data measure the accuracy of the voltage transformer under test.
  • the present invention can realize accurate measurement of voltage transformer precision in long-distance and strong interference environments, avoid losses caused by misjudgment, and use the method of first adjusting frequency resonance and then adjusting sense resonance to check and boost voltage , which can effectively reduce the weight and volume of the equipment, and improve the on-site calibration level and work efficiency.
  • Fig. 1 is a schematic flow chart of a high-precision measurement method for a voltage transformer provided by an embodiment of the present invention
  • Fig. 2 is a functional block diagram of a voltage transformer high-precision measurement system provided by an embodiment of the present invention
  • Fig. 3 is an equivalent circuit diagram after introducing a resonant device provided by an embodiment of the present invention.
  • Fig. 4 is a circuit diagram of a voltage transformer high-precision measurement system provided by an embodiment of the present invention.
  • Fig. 5 is an equivalent circuit diagram of an error test of a voltage transformer under test provided by an embodiment of the present invention.
  • FIG. 1 it is a schematic flowchart of an alternative embodiment of a high-precision measurement method for voltage transformers provided by the present invention.
  • the high-precision measurement method for voltage transformers includes the following steps:
  • Step S101 acquiring the systematic error of the measurement system.
  • obtaining the systematic error of the measurement system includes: performing load calculation on the test loop of the measurement system to obtain the load of the test loop; based on the load of the test loop, determining the test equipment of the test loop and the equipment parameters of the test equipment; according to the test The equipment and equipment parameters determine the measurement system; calculate the systematic error of the measurement system to obtain the systematic error of the measurement system.
  • test equipment of the test loop and the parameters of the test equipment are selected and determined.
  • the specific calculation process is as follows:
  • FIG. 3 it is an equivalent diagram after introducing a resonant device 30 (programmable adjustable reactor), where L in FIG. 3 is a resonant inductance (resonant device 30 ), and C is a resonant capacitor.
  • L in FIG. 3 is a resonant inductance (resonant device 30 )
  • C is a resonant capacitor.
  • the resonant angular frequency is The resonant frequency
  • the resonant frequency of the series circuit is determined by the parameters L and C of the circuit itself, and has nothing to do with external conditions.
  • the power frequency is constant, adjust the circuit parameters L or C to make the fixed natural frequency of the circuit consistent with the power frequency. Resonance occurs.
  • the power frequency resonance in the embodiment of the present invention means that the resonance occurs at a frequency of 50 Hz.
  • the GIS-to-ground capacitance on the switchyard side is 2289pF
  • the GIS-to-ground capacitance on the main transformer side is 1632pF
  • the test bushing-to-ground capacitance is 150pF
  • the specific capacitance values are shown in Table 1 below.
  • two programmable adjustable reactors can be selected (the inductance-tuning reactance in Table 2 below reactor and adjustable reactor) and a fixed reactor.
  • the specific test equipment and the equipment parameters of the test equipment are shown in Table 2 below.
  • the specific functional block diagrams are shown in Figure 2 and Figure 4.
  • the measurement system includes: a power controller 10 , a conversion unit 20 , a resonance device 30 , a standard voltage transformer 40 , a measured voltage transformer 50 and an error measurement device 60 .
  • the power controller 10, the conversion unit 20 and the resonant device 30 are connected in sequence, the input end of the standard voltage transformer 40 is connected to the resonant device 30, the output end of the standard voltage transformer 40 is connected to the error measuring device 60, and the measured voltage transformer 50 One end is connected to the resonance device 30 and the other end is connected to the error measuring device 60 .
  • the power controller 10 is used to input power according to the set parameters and output the voltage signal to the conversion unit 20; the conversion unit 20 is used to convert the voltage signal and output it to the resonance device 30; the resonance device 30 is used to perform tuning control;
  • the error measuring device 60 is used to measure the accuracy of the standard voltage transformer and the voltage transformer 50 under test.
  • the conversion unit 20 includes: an excitation transformer; the primary winding of the excitation transformer is connected to the output end of the power controller 10 , and the secondary winding of the excitation transformer is connected to the input end of the resonant device 30 .
  • the resonance device 30 includes: a tuning reactor, an adjustable reactor, and a fixed reactor.
  • the first end of the sense regulating reactor is connected with the output end of the excitation transformer, the second end of the sense regulating reactor is connected with the standard voltage transformer and the measured voltage transformer 50, the adjustable reactor and the fixed reactor are connected with the sense regulating reactance in turn devices in parallel.
  • both the sense-tuning reactor and the adjustable reactor are adjustable, and the fixed reactor is a reactor with a fixed inductance.
  • the measurement system further includes: the voltage transformer 50 to be tested, and a load box 70 for providing load to the voltage transformer 50 to be tested.
  • the systematic error of the measurement system includes: the systematic error of the voltage transformer 50 under test and the systematic error of the standard voltage transformer 40 .
  • the error produced by the standard voltage transformer 40 is the error caused by the lead wire between the secondary terminal of the standard voltage transformer 40 and the error measuring device 60, because when the electronic error measuring device 60 is used, its secondary circuit sampling The impedance is very large, so that the entire loop current is very small, and the impedance caused by the length of the secondary measurement loop has little effect on the measurement results and can be ignored.
  • the systematic error of the measurement system is mainly the error caused by the voltage transformer 50 under test.
  • the systematic error of the voltage transformer 50 under test includes: a first systematic error, a second systematic error and a third systematic error.
  • the first systematic error is: when the load box 70 is at the rated load, the error caused by the voltage drop from the secondary terminal of the measured voltage transformer 50 to the lead wire of the error measuring device 60 .
  • the second system error is: when the load box 70 is at the lower limit load, the error caused by the voltage drop from the secondary terminal of the measured voltage transformer 50 to the lead wire of the error measuring device 60 .
  • the third systematic error is: the error caused by the voltage drop from the secondary terminal of the voltage transformer 50 under test to the lead wire of the error measuring device 60 when the load box 70 is under no load.
  • calculating the systematic error of the measurement system, and obtaining the systematic error of the measurement system includes: calculating the rated admittance of the load box 70 when the load box 70 is at the rated load; obtaining the rated measured value of the voltage transformer 50 under test. Resistance value: According to the rated admittance of the load box 70 and the rated measured resistance value of the voltage transformer 50 under test, the first systematic error is obtained.
  • calculating the systematic error of the measurement system, and obtaining the systematic error of the measurement system includes: calculating the lower limit admittance of the load box 70 when the load box 70 is at the lower limit load; Resistance value; according to the lower limit admittance of the load box 70 and the lower limit measured resistance value of the voltage transformer 50 under test, the second systematic error is obtained.
  • FIG. 5 it is an equivalent circuit diagram of the error test of the tested voltage transformer 50 .
  • a and N are the primary windings of the voltage transformer 50 under test
  • a and x are the secondary windings of the voltage transformer 50 under test
  • r is the connection between the secondary end of the voltage transformer 50 under test and the error measuring device 60.
  • the lead wire resistance of the secondary terminal Z1 is the impedance of the load box 70
  • Z2 is the input impedance of the error measuring device 60 . Wherein, Z2>>Z1.
  • the first systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the voltage transformer 50 under test to the error measuring device 60; Y1 is the rated admittance of the load box 70.
  • the rated admittance of the load bank 70 is obtained by the following formula:
  • Y 1 is the rated admittance of the load box 70; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the second systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the measured voltage transformer 50 to the error measuring device 60; Y 2 is the lower limit admittance of the load box 70.
  • the lower limit admittance of the load cell 70 is obtained by the following formula:
  • Y 2 is the lower limit admittance of the load box 70; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the load box 70 when the load box 70 is at the rated load, it is 75VA, and the power factor Rated secondary voltage
  • the cross-sectional area of the leads from the secondary terminal of the voltage transformer 50 under test to the error measuring device 60 is 2.5 mm 2 , the distance between the leads is 10 meters, and the measured resistance value is 0.074 ⁇ .
  • the resistance of the lead wires from the secondary terminal of the voltage transformer 50 under test to the secondary terminal of the error measuring device 60 is only a few hundred thousandths, which is negligible.
  • Step S102 performing series resonance on the measurement system by means of low-voltage frequency modulation resonance to obtain a resonance frequency point.
  • Step S103 calculating the resonant inductance according to the resonant frequency point.
  • Step S104 adjust the resonant device 30 according to the resonant inductance, so as to boost the power frequency resonance of the measurement system.
  • Step S105 acquiring accuracy data of the voltage transformer 50 under test when measuring the power frequency resonance boost of the system.
  • Step S106 measuring the accuracy of the voltage transformer 50 under test according to the system error and accuracy data.
  • step S102 and step S103 after determining the systematic error of the measurement system and determining the test equipment and the parameters of the test equipment of the measurement system, the parameters of Fig. 2 and Fig. 4 are formed based on the determined test equipment and the parameters of the test equipment.
  • the principle block diagram and circuit diagram of the measurement system and then use the low-voltage frequency modulation resonance method to perform series resonance on the measurement system to obtain the resonance frequency point, and then calculate the actual operating resonance inductance according to the obtained resonance frequency point, and then, according to the calculated
  • the resonant inductance can be adjusted to adjust the inductance reactor and the adjustable reactor, so that the excitation transformer can carry out power frequency resonance step-up.
  • Accuracy measurement and record the corresponding accuracy data, and then measure the accuracy of the voltage transformer 50 under test according to the system error and accuracy data. That is, the accuracy data measured by the error measuring device 60 is corrected by the systematic error to obtain accurate data of the accuracy measurement of the voltage transformer 50 under test. Specifically: subtract the first system error from the accuracy data measured at rated load to obtain the corrected accuracy data of the measured voltage transformer 50 under rated load; Error, the corrected precision data of the tested voltage transformer 50 under the lower limit load can be obtained; the measured precision data at no-load is the corrected precision data of the tested voltage transformer 50 .
  • FIG. 2 it is a functional block diagram of an alternative embodiment of the voltage transformer high-precision measurement system provided by the present invention.
  • the voltage transformer high-precision measurement system can be used to realize the voltage transformer high-precision measurement method disclosed in the embodiment of the present invention.
  • FIG. 4 is a refined circuit diagram of FIG. 2 .
  • B1 is the excitation transformer
  • L1 is the inductance regulating reactor
  • L2 is the adjustable reactor
  • L3 is the fixed reactor
  • P0 is the standard voltage transformer
  • PX is the measured voltage transformer
  • Y1 ⁇ Y4 are the load boxes .
  • the voltage transformer high-precision measurement system includes: a power controller 10 , a conversion unit 20 , a resonance device 30 , a standard voltage transformer 40 , a measured voltage transformer 50 and an error measurement device 60 .
  • the power controller 10, the conversion unit 20 and the resonant device 30 are connected in sequence, the input end of the standard voltage transformer 40 is connected to the resonant device 30, the output end of the standard voltage transformer 40 is connected to the error measuring device 60, and the measured voltage transformer 50 One end is connected to the resonance device 30 and the other end is connected to the error measuring device 60 .
  • the power controller 10 is used to input power according to the set parameters and output the voltage signal to the conversion unit 20; the conversion unit 20 is used to convert the voltage signal and output it to the resonant device 30; the resonant device 30 is used for tuning control; error measurement The device 60 is used to measure the accuracy of the standard voltage transformer and the voltage transformer 50 under test.
  • the conversion unit 20 includes: an excitation transformer.
  • the primary winding of the excitation transformer is connected to the output terminal of the power controller 10
  • the secondary winding of the excitation transformer is connected to the input terminal of the resonant device 30 .
  • the resonance device 30 includes: a tuning reactor, an adjustable reactor, and a fixed reactor.
  • the first end of the sense regulating reactor is connected with the output end of the excitation transformer, the second end of the sense regulating reactor is connected with the standard voltage transformer and the measured voltage transformer 50, the adjustable reactor and the fixed reactor are connected with the sense regulating reactance in turn devices in parallel.
  • the voltage transformer high-precision measurement system further includes: the voltage transformer 50 to be tested, and a load box 70 for providing load to the voltage transformer 50 to be tested.
  • the systematic error of the measurement system includes: the systematic error of the voltage transformer 50 under test and the systematic error of the standard voltage transformer 40 .
  • the error produced by the standard voltage transformer 40 is the error caused by the lead wire between the secondary terminal of the standard voltage transformer 40 and the error measuring device 60, because when the electronic error measuring device 60 is used, its secondary circuit sampling The impedance is very large, so that the entire loop current is very small, and the impedance caused by the length of the secondary measurement loop has little effect on the measurement results and can be ignored.
  • the systematic error of the measurement system is mainly the error caused by the voltage transformer 50 under test.
  • the systematic error of the voltage transformer 50 under test includes: a first systematic error, a second systematic error and a third systematic error.
  • the first systematic error is: when the load box 70 is at the rated load, the error caused by the voltage drop from the secondary terminal of the measured voltage transformer 50 to the lead wire of the error measuring device 60 .
  • the second system error is: when the load box 70 is at the lower limit load, the error caused by the voltage drop from the secondary terminal of the measured voltage transformer 50 to the lead wire of the error measuring device 60 .
  • the third systematic error is: the error caused by the voltage drop from the secondary terminal of the voltage transformer 50 under test to the lead wire of the error measuring device 60 when the load box 70 is under no load.
  • the first systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the voltage transformer 50 under test to the error measuring device 60; Y1 is the rated admittance of the load box 70.
  • the rated admittance of the load bank 70 is obtained by the following formula:
  • Y 1 is the rated admittance of the load box 70; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the second systematic error is obtained by the following formula:
  • r is the lead wire resistance from the secondary terminal of the measured voltage transformer 50 to the error measuring device 60; Y 2 is the lower limit admittance of the load box 70.
  • the lower limit admittance of the load cell 70 is obtained by the following formula:
  • Y 2 is the lower limit admittance of the load box 70; is the power factor cosine value; U 2 is the phase voltage value; is the sine value of the power factor; j is the sign of the imaginary number.
  • the system error is obtained by calculating the error introduced by the connecting wire from the secondary side of the voltage transformer 50 under test to the error measuring device 60, and the measured value of the error measuring device 60 is corrected by using the system error, so that The corrected result can truly reflect the actual accuracy of the voltage transformer 50 under test.
  • the embodiment of the present invention can make the test circuit resonate at the power frequency or other specified frequencies by adjusting the parameters of the primary side, realize the high-voltage test using a conventional capacity test transformer, and greatly improve the test efficiency.
  • the embodiment of the present invention adopts the method of first adjusting the frequency resonance and then adjusting the sense resonance to intelligently realize the verification boost, and uses the high-voltage adjustable reactor to compensate on the primary side, which saves a huge test transformer and reduces the The weight and volume of the equipment solve the problem that it is difficult to realize the on-site calibration boost, thereby improving the on-site calibration level and work efficiency.
  • each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.
  • the description is relatively simple, and for the related information, please refer to the description of the method part.
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
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  • Measurement Of Current Or Voltage (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

La présente invention concerne un procédé et un système de mesure de haute précision pour un transformateur de tension. Le procédé comprend les étapes suivantes consistant à : acquérir une erreur de système d'un système de mesure (S101) ; effectuer une résonance série sur le système de mesure selon une manière de résonance de modulation de fréquence basse tension, afin d'obtenir un point de fréquence de résonance (S102) ; calculer une inductance de résonance en fonction du point de fréquence de résonance (S103) ; régler un dispositif résonant en fonction de l'inductance de résonance, afin d'amplifier la résonance de fréquence de puissance du système de mesure (S104) ; lorsque la résonance de fréquence de puissance du système de mesure est amplifiée, acquérir des données de précision d'un transformateur de tension qui est testé (S105) ; et, en fonction de l'erreur de système et des données de précision, mesurer la précision du transformateur de tension qui est testé (S106). Grâce à l'introduction d'une erreur de système, la précision d'un transformateur de tension peut être mesurée avec précision dans un environnement à longue distance et à forte interférence, de sorte que des pertes provoquées par un mauvais jugement sont évitées ; en outre, une amplification de contrôle est effectuée à l'aide d'un procédé de première résonance de modulation de fréquence puis par résonance de modulation par induction, de sorte que le poids et le volume du dispositif peuvent être efficacement réduits, ce qui permet d'améliorer le niveau de contrôle de terrain et l'efficacité du travail.
PCT/CN2022/103131 2021-09-01 2022-06-30 Procédé et système de mesure de haute précision pour transformateur de tension WO2023029716A1 (fr)

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CN115932702A (zh) * 2023-03-14 2023-04-07 武汉格蓝若智能技术股份有限公司 基于虚拟标准器的电压互感器在线运行校准方法及装置

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CN113866703A (zh) * 2021-09-01 2021-12-31 中广核工程有限公司 一种电压互感器高精度测量方法和系统

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