WO2023029716A1 - High-precision measurement method and system for voltage transformer - Google Patents

High-precision measurement method and system for voltage transformer 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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French (fr)
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/en

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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

Definitions

  • 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.

Abstract

A high-precision measurement method and system for a voltage transformer. The method comprises the following steps: acquiring a system error of a measurement system (S101); performing series resonance on the measurement system in a low-voltage frequency-modulation resonance manner, so as to obtain a resonant frequency point (S102); calculating a resonant inductance according to the resonant frequency point (S103); adjusting a resonant device according to the resonant inductance, so as to boost the power-frequency resonance of the measurement system (S104); when the power-frequency resonance of the measurement system is boosted, acquiring precision data of a voltage transformer under test (S105); and according to the system error and the precision data, measuring the precision of the voltage transformer under test (S106). By means of introducing a system error, the precision of a voltage transformer can be accurately measured in a long-distance and strong-interference environment, such that losses caused by misjudgment are avoided; moreover, check boosting is performed by using a method of first frequency-modulation resonance and then induction-modulation resonance, such that the device weight and volume can be effectively reduced, thereby improving the field check level and the working efficiency.

Description

一种电压互感器高精度测量方法和系统A high-precision measurement method and system for voltage transformers 技术领域technical field
本发明涉及高压互感器试验的技术领域，更具体地说，涉及一种电压互感器高精度测量方法和系统。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.
背景技术Background technique
因前期规划原因，相比于项目一期工程、二期主变压器到开关站(一期建设完成)的距离较远，两者之间的GIS和GIL母线长度由一期最长459米变压二期776米，GIL和GIS母线的对地分布电容大幅增加，且现场试验布线在高压廓道内、电磁干扰严重且难以消除，根据电工学理论，用于该回路的GIS内部电压互感器精度测量的升压试验变压器，其容量将大幅增加，因现场试验电源容量有限，无法满足试验要求。Due to pre-planning reasons, compared with the first phase of the project, 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 In the second phase of 776 meters, 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. According to the theory of electrotechnical science, 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.
现有的GIS内部电压互感器的测试方法，由于外部引入误差较小，测得的试验数据在包含误差情况下基本能满足试验标准要求，但在扩建工程中，由于长距离及强干扰等因素，造成外部引入误差非常大，将会导致试验数据无法满足标准要求。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.
目前各试验手段在现场进行超远距离500kV变电站电压互感器高精度测量试验时，均没有消除试验线路引入测量误差的有效手段，实际测量结果无法真实反映互感器的精度，如果不正确处理，将会导致电压互感器精度误判，给工程和电厂运行带来重大的经济损失。At present, when various test methods are used to conduct ultra-long-distance 500kV substation voltage transformer high-precision measurement tests on the spot, there is no effective means to eliminate the measurement error introduced by the test line. The actual measurement results cannot truly reflect the accuracy of the transformer. If it is not handled correctly, it will be It will lead to misjudgment of voltage transformer accuracy, and bring significant economic losses to engineering and power plant operation.
发明内容Contents of the invention
本发明要解决的技术问题在于，针对现有技术的上述缺陷，提供一种电压互感器高精度测量方法和系统。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.
本发明解决其技术问题所采用的技术方案是：构造一种电压互感器高精 度测量方法，包括以下步骤：The technical scheme that the present invention solves its technical problem is: construct a kind of voltage transformer high-precision measurement method, comprise the following steps:
获取测量系统的系统误差；Obtain the systematic error of the measurement system;
采用低压调频谐振的方式对所述测量系统进行串联谐振，获得谐振频率点；Perform series resonance on the measurement system by means of low-voltage frequency modulation resonance to obtain a resonance frequency point;
根据所述谐振频率点计算谐振电感量；calculating the resonant inductance according to the resonant frequency point;
根据所述谐振电感量对所述谐振设备进行调节，以使所述测量系统的工频谐振升压；adjusting the resonant device according to the resonant inductance, so as to boost the power frequency resonance of the measurement system;
在所述测量系统的工频谐振升压时，获取被测电压互感器的精度数据；Acquiring the precision data of the voltage transformer under test when the power frequency resonance of the measuring system is boosted;
根据所述系统误差和所述精度数据测量所述被测电压互感器的精度。and measuring the accuracy of the voltage transformer under test according to the system error and the accuracy data.
在本发明所述的电压互感器高精度测量方法中，所述获取测量系统的系统误差包括：In the high-precision measurement method of a voltage transformer according to the present invention, the acquisition of the systematic error of the measurement system includes:
对所述测量系统的测试回路进行负荷计算，获得所述测试回路的负荷；performing load calculation on the test loop of the measurement system to obtain the load of the test loop;
基于所述测试回路的负荷，确定测试回路的测试设备及所述测试设备的设备参数；Based on the load of the test loop, determine the test equipment of the test loop and the equipment parameters of the test equipment;
根据所述测试设备和所述设备参数确定所述测量系统；determining the measurement system based on the test equipment and the equipment parameters;
对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差。The systematic error of the measurement system is calculated to obtain the systematic error of the measurement system.
在本发明所述的电压互感器高精度测量方法中，所述测量系统包括：电源控制器、转换单元、谐振设备、标准电压互感器、被测电压互感器以及误差测量装置；In the high-precision measurement method of a voltage transformer according to the present invention, 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;
所述电源控制器、所述转换单元以及所述谐振设备依次连接，所述标准电压互感器的输入端与所述谐振设备连接，所述标准电压互感器的输出端与所述误差测量装置连接，所述被测电压互感器一端与所述谐振设备连接、另一端与所述误差测量装置连接；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;
所述电源控制器用于根据设置参数对输入电源并输出电压信号至所述转换单元；The power controller is used to input power and output voltage signals to the conversion unit according to the set parameters;
所述转换单元用于对所述电压信号进行转换处理并输出至所述谐振设备；The conversion unit is used to convert the voltage signal and output it to the resonance device;
所述谐振设备用于进行调谐控制；the resonant device is used for tuning control;
所述误差测量装置用于对所述标准电压器和所述被测电压互感器的精度进行测量。The error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
在本发明所述的电压互感器高精度测量方法中，所述转换单元包括：励磁变压器；In the high-precision measurement method of a voltage transformer according to the present invention, the conversion unit includes: an excitation transformer;
所述励磁变压器的初级绕组与所述电源控制器的输出端连接，所述励磁变压器的次级绕组与所述谐振设备的输入端连接。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.
在本发明所述的电压互感器高精度测量方法中，所述谐振设备包括：调感电抗器、可调电抗器、固定电抗器；In the high-precision measurement method of a voltage transformer according to the present invention, the resonance device includes: a sense-tuning reactor, an adjustable reactor, and a fixed reactor;
所述调感电抗器的第一端与所述励磁变压器的输出端连接，所述调感电抗器的第二端与所述标准电压器和被测电压互感器连接，所述可调电抗器和所述固定电抗器依次与所述调感电抗器并联。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.
在本发明所述的电压互感器高精度测量方法中，还包括：与所述被测电压互感器、用于向所述被测电压互感器提供负荷的负荷箱。In the high-precision measuring method for a voltage transformer according to the present invention, it further includes: the voltage transformer under test and a load box for providing load to the voltage transformer under test.
在本发明所述的电压互感器高精度测量方法中，所述系统误差包括：被测电压互感器的系统误差和标准电压互感器的系统误差；In the high-precision measurement method of a voltage transformer according to the present invention, the system error includes: a system error of the measured voltage transformer and a system error of a standard voltage transformer;
所述被测电压互感器的系统误差包括：第一系统误差、第二系统误差和第三系统误差；The system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
所述第一系统误差为：在所述负荷箱处于额定负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
所述第二系统误差为：在所述负荷箱处于下限负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
所述第三系统误差为：在所述负荷箱处于空载时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差。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.
在本发明所述的电压互感器高精度测量方法中，所述对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差包括：In the high-precision measurement method of a voltage transformer according to the present invention, the calculation of the systematic error of the measurement system, and obtaining the systematic error of the measurement system include:
在所述负荷箱处于额定负荷时，计算所述负荷箱的额定导纳；calculating the rated admittance of the load bank when the load bank is at rated load;
获取所述被测电压互感器的额定实测电阻值；Obtain the rated measured resistance value of the voltage transformer under test;
根据所述负荷箱的额定导纳和所述被测电压互感器的额定实测电阻值， 获得所述第一系统误差。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.
在本发明所述的电压互感器高精度测量方法中，所述第一系统误差通过以下式子获得：In the high-precision measurement method of a voltage transformer according to the present invention, the first systematic error is obtained by the following formula:
ε 75＝r*Y 1； ε 75 =r*Y 1 ;
式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 1为所述负荷箱的额定导纳。 In the 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.
在本发明所述的电压互感器高精度测量方法中，所述负荷箱的额定导纳通过以下式子获得：In the high-precision measurement method for voltage transformers described in the present invention, the rated admittance of the load box is obtained by the following formula:
Figure PCTCN2022103131-appb-000001
Figure PCTCN2022103131-appb-000001
式中，Y 1为所述负荷箱的额定导纳；
Figure PCTCN2022103131-appb-000002
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000003
为功率因数正弦值；j为虚数的符号。 In the formula, Y1 is the rated admittance of the load box;
Figure PCTCN2022103131-appb-000002
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000003
is the sine value of the power factor; j is the sign of the imaginary number.
在本发明所述的电压互感器高精度测量方法中，所述对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差包括：In the high-precision measurement method of a voltage transformer according to the present invention, the calculation of the systematic error of the measurement system, and obtaining the systematic error of the measurement system include:
在所述负荷箱处于下限负荷时，计算所述负荷箱的下限导纳；calculating the lower limit admittance of the load box when the load box is at the lower limit load;
获取所述被测电压互感器的下限实测电阻值；Obtaining the lower limit measured resistance value of the voltage transformer under test;
根据所述负荷箱的下限导纳和所述被测电压互感器的下限实测电阻值，获得所述第二系统误差。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.
在本发明所述的电压互感器高精度测量方法中，所述第二系统误差通过以下式子获得；In the high-precision measurement method of a voltage transformer according to the present invention, the second systematic error is obtained by the following formula;
ε 25＝r*Y 2； ε 25 =r*Y 2 ;
式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 2为所述负荷箱的下限导纳。 In the 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.
在本发明所述的电压互感器高精度测量方法中，所述负荷箱的下限导纳通过以下式子获得：In the high-precision measurement method for voltage transformers described in the present invention, the lower limit admittance of the load box is obtained by the following formula:
Figure PCTCN2022103131-appb-000004
Figure PCTCN2022103131-appb-000004
式中，Y 2为所述负荷箱的下限导纳；
Figure PCTCN2022103131-appb-000005
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000006
为功率因数正弦值；j为虚数的符号。 In the formula, Y 2 is the lower limit admittance of the load box;
Figure PCTCN2022103131-appb-000005
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000006
is the sine value of the power factor; j is the sign of the imaginary number.
本发明还提供一种电压互感器高精度测量系统，包括：电源控制器、转 换单元、谐振设备、标准电压互感器、被测电压互感器以及误差测量装置；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;
所述电源控制器、所述转换单元以及所述谐振设备依次连接，所述标准电压互感器的输入端与所述谐振设备连接，所述标准电压互感器的输出端与所述误差测量装置连接，所述被测电压互感器一端与所述谐振设备连接、另一端与所述误差测量装置连接；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;
所述电源控制器用于根据设置参数对输入电源并输出电压信号至所述转换单元；The power controller is used to input power and output voltage signals to the conversion unit according to the set parameters;
所述转换单元用于对所述电压信号进行转换处理并输出至所述谐振设备；The conversion unit is used to convert the voltage signal and output it to the resonance device;
所述谐振设备用于进行调谐控制；the resonant device is used for tuning control;
所述误差测量装置用于对所述标准电压器和所述被测电压互感器的精度进行测量。The error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
在本发明所述的电压互感器高精度测量方法中，所述转换单元包括：励磁变压器；In the high-precision measurement method of a voltage transformer according to the present invention, the conversion unit includes: an excitation transformer;
所述励磁变压器的初级绕组与所述电源控制器的输出端连接，所述励磁变压器的次级绕组与所述谐振设备的输入端连接。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.
在本发明所述的电压互感器高精度测量方法中，所述谐振设备包括：调感电抗器、可调电抗器、固定电抗器；In the high-precision measurement method of a voltage transformer according to the present invention, the resonance device includes: a sense-tuning reactor, an adjustable reactor, and a fixed reactor;
所述调感电抗器的第一端与所述励磁变压器的输出端连接，所述调感电抗器的第二端与所述标准电压器和被测电压互感器连接，所述可调电抗器和所述固定电抗器依次与所述调感电抗器并联。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.
在本发明所述的电压互感器高精度测量方法中，还包括：与所述被测电压互感器、用于向所述被测电压互感器提供负荷的负荷箱。In the high-precision measuring method for a voltage transformer according to the present invention, it further includes: the voltage transformer under test and a load box for providing load to the voltage transformer under test.
在本发明所述的电压互感器高精度测量方法中，所述系统误差包括：被测电压互感器的系统误差和标准电压互感器的系统误差；In the high-precision measurement method of a voltage transformer according to the present invention, the system error includes: a system error of the measured voltage transformer and a system error of a standard voltage transformer;
所述被测电压互感器的系统误差包括：第一系统误差、第二系统误差和第三系统误差；The system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
所述第一系统误差为：在所述负荷箱处于额定负荷时，所述被测电压互 感器的二次端到所述误差测量装置引线压降引起的误差；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;
所述第二系统误差为：在所述负荷箱处于下限负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
所述第三系统误差为：在所述负荷箱处于空载时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差。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.
在本发明所述的电压互感器高精度测量方法中，所述第一系统误差通过以下式子获得：In the high-precision measurement method of a voltage transformer according to the present invention, the first systematic error is obtained by the following formula:
ε 75＝r*Y 1； ε 75 =r*Y 1 ;
式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 1为所述负荷箱的额定导纳。 In the 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.
在本发明所述的电压互感器高精度测量方法中，所述负荷箱的额定导纳通过以下式子获得：In the high-precision measurement method for voltage transformers described in the present invention, the rated admittance of the load box is obtained by the following formula:
Figure PCTCN2022103131-appb-000007
Figure PCTCN2022103131-appb-000007
式中，Y 1为所述负荷箱的额定导纳；
Figure PCTCN2022103131-appb-000008
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000009
为功率因数正弦值；j为虚数的符号。 In the formula, Y1 is the rated admittance of the load box;
Figure PCTCN2022103131-appb-000008
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000009
is the sine value of the power factor; j is the sign of the imaginary number.
在本发明所述的电压互感器高精度测量系统中，所述第二系统误差通过以下式子获得；In the voltage transformer high-precision measurement system of the present invention, the second system error is obtained by the following formula;
ε 25＝r*Y 2； ε 25 =r*Y 2 ;
式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 2为所述负荷箱的下限导纳。 In the 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.
在本发明所述的电压互感器高精度测量系统中，所述负荷箱的下限导纳通过以下式子获得：In the high-precision measurement system for voltage transformers according to the present invention, the lower limit admittance of the load box is obtained by the following formula:
Figure PCTCN2022103131-appb-000010
Figure PCTCN2022103131-appb-000010
式中，Y 2为所述负荷箱的下限导纳；
Figure PCTCN2022103131-appb-000011
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000012
为功率因数正弦值；j为虚数的符号。 In the formula, Y 2 is the lower limit admittance of the load box;
Figure PCTCN2022103131-appb-000011
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000012
is the sine value of the power factor; j is the sign of the imaginary number.
实施本发明的电压互感器高精度测量方法和系统，具有以下有益效果：包括以下步骤：获取测量系统的系统误差；采用低压调频谐振的方式对测量系统进行串联谐振，获得谐振频率点；根据谐振频率点计算谐振电感量；根 据谐振电感量对谐振设备进行调节，以使测量系统的工频谐振升压；在测量系统的工频谐振升压时，获取被测电压互感器的精度数据；根据系统误差和精度数据测量被测电压互感器的精度。本发明通过引入系统误差，可实现对长距离及强干扰环境下对电压互感器精度的准确测量，避免因误判造成的损失，且采用先调频谐振后调感谐振的方法进行校验升压，可有效减轻设备重量与体积，提高现场校验水平和工作效率。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. By introducing system errors, 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.
附图说明Description of drawings
下面将结合附图及实施例对本发明作进一步说明，附图中：The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:
图1是本发明实施例提供的电压互感器高精度测量方法的流程示意图；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;
图2是本发明实施例提供的电压互感器高精度测量系统的原理框图；Fig. 2 is a functional block diagram of a voltage transformer high-precision measurement system provided by an embodiment of the present invention;
图3是本发明实施例提供的引入谐振设备后的等效电路图；Fig. 3 is an equivalent circuit diagram after introducing a resonant device provided by an embodiment of the present invention;
图4是本发明实施例提供的电压互感器高精度测量系统的电路图；Fig. 4 is a circuit diagram of a voltage transformer high-precision measurement system provided by an embodiment of the present invention;
图5是本发明实施例提供的被测电压互感器的误差测试等效电路图。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.
具体实施方式Detailed ways
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
参考图1，为本发明提供的电压互感器高精度测量方法一可选实施例的流程示意图。Referring to 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.
如图1所示，该电压互感器高精度测量方法包括以下步骤：As shown in Figure 1, the high-precision measurement method for voltage transformers includes the following steps:
步骤S101、获取测量系统的系统误差。Step S101, acquiring the systematic error of the measurement system.
一些实施例中，获取测量系统的系统误差包括：对测量系统的测试回路进行负荷计算，获得测试回路的负荷；基于测试回路的负荷，确定测试回路的测试设备及测试设备的设备参数；根据测试设备和设备参数确定测量系统；对测量系统的系统误差进行计算，获得测量系统的系统误差。In some embodiments, 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.
具体的，在进行测量系统的系统误差获取之前，先对测试回路的测试设备及测试设备的参数进行选择确定。其具体的计算过程如下：Specifically, before obtaining the systematic error of the measurement system, the test equipment of the test loop and the parameters of the test equipment are selected and determined. The specific calculation process is as follows:
如图3所示，为引入谐振设备30(程控可调电抗器)后的等效图，其中，图3中的L为谐振电感(谐振设备30)，C为谐振电容。As shown in 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.
串联谐振回路在正弦电压E作用下，其复阻抗为：The complex impedance of the series resonant circuit under the action of sinusoidal voltage E is:
Figure PCTCN2022103131-appb-000013
Figure PCTCN2022103131-appb-000013
式中电抗X＝XL-XC是角频率ω的函数，在ω＝ω 0时，
Figure PCTCN2022103131-appb-000014
Figure PCTCN2022103131-appb-000015
In the formula, reactance X=XL-XC is a function of angular frequency ω, when ω=ω 0 ,
Figure PCTCN2022103131-appb-000014
Figure PCTCN2022103131-appb-000015
谐振角频率为
Figure PCTCN2022103131-appb-000016
谐振频率为
Figure PCTCN2022103131-appb-000017
The resonant angular frequency is
Figure PCTCN2022103131-appb-000016
The resonant frequency is
Figure PCTCN2022103131-appb-000017
由(1)式可知，串联电路的谐振频率是由电路自身参数L、C决定，与外部条件无关，当电源频率一定时，调节电路参数L或C，使电路固定固有频率与电源频率一致而发生谐振。可以理解地，本发明实施例的工频谐振即为在50Hz的频率下发生谐振。It can be seen from formula (1) that 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. When 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. It can be understood that the power frequency resonance in the embodiment of the present invention means that the resonance occurs at a frequency of 50 Hz.
可选的，本发明实施例中，可以通过查询厂家技术文件，确定开关站侧GIS对地电容为2289pF，主变侧GIS对地电容为1632pF，试验套管对地电容为150pF，并计算测试回路的负荷。具体电容值如下表1所示。Optionally, in the embodiment of the present invention, by querying the manufacturer’s technical documents, it can be determined that the GIS-to-ground capacitance on the switchyard side is 2289pF, the GIS-to-ground capacitance on the main transformer side is 1632pF, and the test bushing-to-ground capacitance is 150pF, and the test circuit load. The specific capacitance values are shown in Table 1 below.
Figure PCTCN2022103131-appb-000018
Figure PCTCN2022103131-appb-000018
表1Table 1
由表1可进行的相应计算，即：The corresponding calculations that can be made from Table 1 are:
CX(A)＝54.23pF/m*710.44m+2289pF+1632pF+150pF＝42598pF＝4.2598*10 -8F。 CX(A)=54.23pF/m*710.44m+2289pF+1632pF+150pF=42598pF=4.2598* 10-8F .
CX(B)＝54.23pF/m*701.04m+2289pF+1632pF+150pF＝42088pF＝4.2088*10 -8F。 CX(B)=54.23pF/m*701.04m+2289pF+1632pF+150pF=42088pF=4.2088* 10-8F .
CX(C)＝54.23pF/m*690.16m+2289pF+1632pF+150pF＝41498pF＝4.1498*10 -8F。 CX(C)=54.23pF/m*690.16m+2289pF+1632pF+150pF=41498pF=4.1498* 10-8F .
进而计算理论谐振电感量，将∫＝50Hz代入谐振公式
Figure PCTCN2022103131-appb-000019
计算电感L如下 Then calculate the theoretical resonant inductance, and substitute ∫=50Hz into the resonance formula
Figure PCTCN2022103131-appb-000019
Calculate the inductance L as follows
Figure PCTCN2022103131-appb-000020
Figure PCTCN2022103131-appb-000020
将前述计算的CX(A)、CX(B)、CX(C)分别代入(2)式，计算结果分别为：Substitute the previously calculated CX(A), CX(B), and CX(C) into formula (2), and the calculation results are as follows:
L(A)＝237.85H；L(B)＝240.74H；L(C)＝244.16H。L(A)=237.85H; L(B)=240.74H; L(C)=244.16H.
因此，根据所计算出的L(A)、L(B)和L(C)，为达到谐振，本发明实施例中，可选用2台程控可调电抗器(如下表2中的调感电抗器和可调电抗器)和1台固定电抗器。其中，具体的测试设备及测试设备的设备参数如下表2所示。其中具体的原理框图如图2和图4所示。Therefore, according to the calculated L(A), L(B) and L(C), in order to achieve resonance, in the embodiment of the present invention, two programmable adjustable reactors can be selected (the inductance-tuning reactance in Table 2 below reactor and adjustable reactor) and a fixed reactor. Wherein, 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.
Figure PCTCN2022103131-appb-000021
Figure PCTCN2022103131-appb-000021
Figure PCTCN2022103131-appb-000022
Figure PCTCN2022103131-appb-000022
表2Table 2
如图2所示，本发明实施例中，测量系统包括：电源控制器10、转换单元20、谐振设备30、标准电压互感器40、被测电压互感器50以及误差测量装置60。As shown in FIG. 2 , in the embodiment of the present invention, 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 .
电源控制器10、转换单元20以及谐振设备30依次连接，标准电压互感器40的输入端与谐振设备30连接，标准电压互感器40的输出端与误差测量装置60连接，被测电压互感器50一端与谐振设备30连接、另一端与误差测量装置60连接。其中，电源控制器10用于根据设置参数对输入电源并输出电压信号至转换单元20；转换单元20用于对电压信号进行转换处理并输出至谐振设备30；谐振设备30用于进行调谐控制；误差测量装置60用于对标准电压器和被测电压互感器50的精度进行测量。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 . Among them, 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.
可选的，本发明实施例中，转换单元20包括：励磁变压器；励磁变压器的初级绕组与电源控制器10的输出端连接，励磁变压器的次级绕组与谐振设备30的输入端连接。Optionally, in the embodiment of the present invention, 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 .
可选的，谐振设备30包括：调感电抗器、可调电抗器、固定电抗器。调感电抗器的第一端与励磁变压器的输出端连接，调感电抗器的第二端与标准电压器和被测电压互感器50连接，可调电抗器和固定电抗器依次与调感电抗 器并联。Optionally, 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.
本发明实施例中，调感电抗器和可调电抗器均可调，固定电抗器为电感量固定的电抗器。In the embodiment of the present invention, both the sense-tuning reactor and the adjustable reactor are adjustable, and the fixed reactor is a reactor with a fixed inductance.
进一步地，该测量系统还包括：与被测电压互感器50、用于向被测电压互感器50提供负荷的负荷箱70。Further, 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.
可选的，本发明实施例中，测量系统的系统误差包括：被测电压互感器50的系统误差和标准电压互感器40的系统误差。其中，标准电压互感器40所产生的误差为标准电压互感器40二次端到误差测量装置60之间的引线所引起的误差，由于当采用电子式误差测量装置60时，其二次回路采样阻抗很大，使得整个回路电流很小，二次测量回路长短所带来的阻抗对测量结果影响很小，可忽略不计。基于此，本发明实施例中，测量系统的系统误差主要是由被测电压互感器50所引起的误差。Optionally, in the embodiment of the present invention, 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 . Wherein, 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. Based on this, in the embodiment of the present invention, the systematic error of the measurement system is mainly the error caused by the voltage transformer 50 under test.
可选的，本发明实施例中，被测电压互感器50的系统误差包括：第一系统误差、第二系统误差和第三系统误差。Optionally, in the embodiment of the present invention, the systematic error of the voltage transformer 50 under test includes: a first systematic error, a second systematic error and a third systematic error.
第一系统误差为：在负荷箱70处于额定负荷时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。第二系统误差为：在负荷箱70处于下限负荷时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。第三系统误差为：在负荷箱70处于空载时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。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.
一些实施例中，对测量系统的系统误差进行计算，获得测量系统的系统误差包括：在负荷箱70处于额定负荷时，计算负荷箱70的额定导纳；获取被测电压互感器50的额定实测电阻值；根据负荷箱70的额定导纳和被测电压互感器50的额定实测电阻值，获得第一系统误差。In some embodiments, 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.
一些实施例中，对测量系统的系统误差进行计算，获得测量系统的系统误差包括：在负荷箱70处于下限负荷时，计算负荷箱70的下限导纳；获取被测电压互感器50的下限实测电阻值；根据负荷箱70的下限导纳和被测电压互感器50的下限实测电阻值，获得第二系统误差。In some embodiments, 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.
如图5所示，为被测电压互感器50的误差测试等效电路图。As shown in FIG. 5 , it is an equivalent circuit diagram of the error test of the tested voltage transformer 50 .
图中，A、N为被测电压互感器50的一次绕组，a、x为被测电压互感器50的二次绕组，r为被测电压互感器50的二次端到误差测量装置60的二次端的引线电阻，Z1为负荷箱70的阻抗，Z2为误差测量装置60的输入阻抗。其中，Z2＞＞Z1。In the figure, 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, and 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 , and Z2 is the input impedance of the error measuring device 60 . Wherein, Z2>>Z1.
可选的，本发明实施例中，第一系统误差通过以下式子获得：Optionally, in this embodiment of the present invention, the first systematic error is obtained by the following formula:
ε 75＝r*Y 1；(3)。 ε 75 =r*Y 1 ; (3).
式中，r为被测电压互感器50二次端到误差测量装置60的引线电阻；Y 1为负荷箱70的额定导纳。 In the 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.
负荷箱70的额定导纳通过以下式子获得：The rated admittance of the load bank 70 is obtained by the following formula:
Figure PCTCN2022103131-appb-000023
Figure PCTCN2022103131-appb-000023
式中，Y 1为负荷箱70的额定导纳；
Figure PCTCN2022103131-appb-000024
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000025
为功率因数正弦值；j为虚数的符号。 In the formula, Y 1 is the rated admittance of the load box 70;
Figure PCTCN2022103131-appb-000024
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000025
is the sine value of the power factor; j is the sign of the imaginary number.
可选的，本发明实施例中，第二系统误差通过以下式子获得；Optionally, in the embodiment of the present invention, the second systematic error is obtained by the following formula:
ε 25＝r*Y 2；(5)。 ε 25 =r*Y 2 ; (5).
式中，r为被测电压互感器50二次端到误差测量装置60的引线电阻；Y 2为负荷箱70的下限导纳。 In the 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.
负荷箱70的下限导纳通过以下式子获得：The lower limit admittance of the load cell 70 is obtained by the following formula:
Figure PCTCN2022103131-appb-000026
Figure PCTCN2022103131-appb-000026
式中，Y 2为负荷箱70的下限导纳；
Figure PCTCN2022103131-appb-000027
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000028
为功率因数正弦值；j为虚数的符号。 In the formula, Y 2 is the lower limit admittance of the load box 70;
Figure PCTCN2022103131-appb-000027
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000028
is the sine value of the power factor; j is the sign of the imaginary number.
具体的，负荷箱70处于额定负荷时为75VA，功率因数
Figure PCTCN2022103131-appb-000029
额定二次电压
Figure PCTCN2022103131-appb-000030
从被测电压互感器50二次端到误差测量装置60的引线截面积为2.5mm 2，导线距离为10米，实测的电阻值为0.074Ω。 Specifically, when the load box 70 is at the rated load, it is 75VA, and the power factor
Figure PCTCN2022103131-appb-000029
Rated secondary voltage
Figure PCTCN2022103131-appb-000030
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 0.074Ω.
因此，可得：Therefore, we can get:
负荷箱70处于75VA，
Figure PCTCN2022103131-appb-000031
在额定二次电压
Figure PCTCN2022103131-appb-000032
下负荷箱70的导纳为： load bank 70 at 75VA,
Figure PCTCN2022103131-appb-000031
at rated secondary voltage
Figure PCTCN2022103131-appb-000032
The admittance of the lower load tank 70 is:
Y 1＝(0.018－j0.0135)S。 Y 1 =(0.018-j0.0135)S.
进而可以计算得到：Then it can be calculated:
ε 75＝r*Y 1＝－0.074×(0.018－j0.0135)＝－0.001332+j0.000999。 ε 75 =r*Y 1 =−0.074×(0.018−j0.0135)=−0.001332+j0.000999.
负荷箱70处于25VA，功率因数
Figure PCTCN2022103131-appb-000033
在额定二次电压
Figure PCTCN2022103131-appb-000034
下负荷箱70的导纳为： load bank 70 at 25VA, power factor
Figure PCTCN2022103131-appb-000033
at rated secondary voltage
Figure PCTCN2022103131-appb-000034
The admittance of the lower load tank 70 is:
Y 2＝(6－j4.5)×10 -3S。 Y 2 =(6-j4.5)×10 -3 S.
进而可以计算得到：Then it can be calculated:
ε 25＝r*Y 2＝－0.074×(6－j4.5)×10-3＝－0.000444+j0.000333。 ε 25 =r*Y 2 =-0.074×(6-j4.5)×10-3=-0.000444+j0.000333.
在空载时，被测电压互感器50的二次端到误差测量装置60的二次端的引线电阻仅为十万分之几，可忽略不计。At no-load, 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.
步骤S102、采用低压调频谐振的方式对测量系统进行串联谐振，获得谐振频率点。Step S102 , performing series resonance on the measurement system by means of low-voltage frequency modulation resonance to obtain a resonance frequency point.
步骤S103、根据谐振频率点计算谐振电感量。Step S103, calculating the resonant inductance according to the resonant frequency point.
步骤S104、根据谐振电感量对谐振设备30进行调节，以使测量系统的工频谐振升压。Step S104 , adjust the resonant device 30 according to the resonant inductance, so as to boost the power frequency resonance of the measurement system.
步骤S105、在测量系统的工频谐振升压时，获取被测电压互感器50的精度数据。Step S105 , acquiring accuracy data of the voltage transformer 50 under test when measuring the power frequency resonance boost of the system.
步骤S106、根据系统误差和精度数据测量被测电压互感器50的精度。Step S106, measuring the accuracy of the voltage transformer 50 under test according to the system error and accuracy data.
具体的，在步骤S102和步骤S103，在确定测量系统的系统误差及对测量系统的测试设备及测试设备的参数确定后，基于所确定的测试设备和测试设备的参数形成图2和图4的测量系统的原理框图和电路图，进而采用低压调频谐振的方式对测量系统进行串联谐振，获得谐振频率点，再根据所获得的谐振频率点计算实际运行的谐振电感量，然后，再根据所计算得到的谐振电感量对调感电抗器和可调电抗器进行调节，使励磁变压器进行工频谐振升压，当励磁变压器进行工频谐振升压时，通过误差测量装置60对被测电压互感器50进行精度测量，并记录相应的精度数据，进而根据系统误差和精度数据测量被测电压互感器50的精度。即通过系统误差对误差测量装置60测量得到的精度数据进行修正，得到被测电压互感器50的精度测量的准确数据。具体为：将额定负荷时测量的精度数据减去第一系统误差，可得到被测电压互感器50在额定负荷下的修正后的精度数据；将下降负荷时测量的精度数据 减去第二系统误差，可得到被测电压互感器50在下限负荷下的修正后的精度数据；空载时测量的精度数据即为被测电压互感器50的修正后的精度数据。Specifically, in 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 .
参考图2，为本发明提供的电压互感器高精度测量系统一可选实施例的原理框图。该电压互感器高精度测量系统可以用于实现本发明实施例公开的电压互感器高精度测量方法。Referring to 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.
其中，图4为本图2细化的电路图。图4中，B1为励磁变压器，L1为调感电抗器，L2为可调电抗器，L3为固定电抗器，P0为标准电压互感器，PX为被测电压互感器，Y1～Y4为负荷箱。Among them, FIG. 4 is a refined circuit diagram of FIG. 2 . In Figure 4, 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, and Y1~Y4 are the load boxes .
如图2所示，该电压互感器高精度测量系统包括：电源控制器10、转换单元20、谐振设备30、标准电压互感器40、被测电压互感器50以及误差测量装置60。As shown in FIG. 2 , 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 .
电源控制器10、转换单元20以及谐振设备30依次连接，标准电压互感器40的输入端与谐振设备30连接，标准电压互感器40的输出端与误差测量装置60连接，被测电压互感器50一端与谐振设备30连接、另一端与误差测量装置60连接。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 .
电源控制器10用于根据设置参数对输入电源并输出电压信号至转换单元20；转换单元20用于对电压信号进行转换处理并输出至谐振设备30；谐振设备30用于进行调谐控制；误差测量装置60用于对标准电压器和被测电压互感器50的精度进行测量。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.
可选的，本发明实施例中，转换单元20包括：励磁变压器。励磁变压器的初级绕组与电源控制器10的输出端连接，励磁变压器的次级绕组与谐振设备30的输入端连接。Optionally, in the embodiment of the present invention, 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 , and the secondary winding of the excitation transformer is connected to the input terminal of the resonant device 30 .
可选的，谐振设备30包括：调感电抗器、可调电抗器、固定电抗器。Optionally, the resonance device 30 includes: a tuning reactor, an adjustable reactor, and a fixed reactor.
调感电抗器的第一端与励磁变压器的输出端连接，调感电抗器的第二端与标准电压器和被测电压互感器50连接，可调电抗器和固定电抗器依次与调感电抗器并联。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.
进一步地，该电压互感器高精度测量系统还包括：与被测电压互感器50、用于向被测电压互感器50提供负荷的负荷箱70。Further, 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.
可选的，本发明实施例中，测量系统的系统误差包括：被测电压互感器50的系统误差和标准电压互感器40的系统误差。其中，标准电压互感器40所产生的误差为标准电压互感器40二次端到误差测量装置60之间的引线所引起的误差，由于当采用电子式误差测量装置60时，其二次回路采样阻抗很大，使得整个回路电流很小，二次测量回路长短所带来的阻抗对测量结果影响很小，可忽略不计。基于此，本发明实施例中，测量系统的系统误差主要是由被测电压互感器50所引起的误差。Optionally, in the embodiment of the present invention, 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 . Wherein, 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. Based on this, in the embodiment of the present invention, the systematic error of the measurement system is mainly the error caused by the voltage transformer 50 under test.
可选的，本发明实施例中，被测电压互感器50的系统误差包括：第一系统误差、第二系统误差和第三系统误差。Optionally, in the embodiment of the present invention, the systematic error of the voltage transformer 50 under test includes: a first systematic error, a second systematic error and a third systematic error.
第一系统误差为：在负荷箱70处于额定负荷时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。第二系统误差为：在负荷箱70处于下限负荷时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。第三系统误差为：在负荷箱70处于空载时，被测电压互感器50的二次端到误差测量装置60引线压降引起的误差。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.
可选的，本发明实施例中，第一系统误差通过以下式子获得：Optionally, in this embodiment of the present invention, the first systematic error is obtained by the following formula:
ε 75＝r*Y 1；(3)。 ε 75 =r*Y 1 ; (3).
式中，r为被测电压互感器50二次端到误差测量装置60的引线电阻；Y 1为负荷箱70的额定导纳。 In the 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.
负荷箱70的额定导纳通过以下式子获得：The rated admittance of the load bank 70 is obtained by the following formula:
Figure PCTCN2022103131-appb-000035
Figure PCTCN2022103131-appb-000035
式中，Y 1为负荷箱70的额定导纳；
Figure PCTCN2022103131-appb-000036
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000037
为功率因数正弦值；j为虚数的符号。 In the formula, Y 1 is the rated admittance of the load box 70;
Figure PCTCN2022103131-appb-000036
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000037
is the sine value of the power factor; j is the sign of the imaginary number.
可选的，本发明实施例中，第二系统误差通过以下式子获得；Optionally, in the embodiment of the present invention, the second systematic error is obtained by the following formula:
ε 25＝r*Y 2；(5)。 ε 25 =r*Y 2 ; (5).
式中，r为被测电压互感器50二次端到误差测量装置60的引线电阻；Y 2为负荷箱70的下限导纳。 In the 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.
负荷箱70的下限导纳通过以下式子获得：The lower limit admittance of the load cell 70 is obtained by the following formula:
Figure PCTCN2022103131-appb-000038
Figure PCTCN2022103131-appb-000038
式中，Y 2为负荷箱70的下限导纳；
Figure PCTCN2022103131-appb-000039
为功率因数余弦值；U 2为相电压值；
Figure PCTCN2022103131-appb-000040
为功率因数正弦值；j为虚数的符号。 In the formula, Y 2 is the lower limit admittance of the load box 70;
Figure PCTCN2022103131-appb-000039
is the power factor cosine value; U 2 is the phase voltage value;
Figure PCTCN2022103131-appb-000040
is the sine value of the power factor; j is the sign of the imaginary number.
本发明实施例通过对被测电压互感器50二次侧到误差测量装置60的连接导线引入的误差进行计算，获得系统误差，并利用该系统误差对误差测量装置60的测量值进行修正，使得修正后的结果可真实反映被测电压互感器50的实际精度。In the embodiment of the present invention, 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.
进一步地，本发明实施例通过对一次侧的参数调整即可使测试回路在工频或者其他各种指定频率下进行谐振，实现利用常规容量试验变压器进行高压试验，并大大提升了试验效率。Furthermore, 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.
另外，本发明实施例通过采用先调频谐振后调感谐振的方式，智能地实现校验升压，采用高压可调电抗器的方式在一次侧进行补偿，省去了庞大的试验变压器，减轻了设备重量与体积，解决现场校验升压难以实现的问题，从而提高现场校验水平和工作效率。In addition, 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.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。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. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.
专业人员还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任 意其它形式的存储介质中。The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.
以上实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据此实施，并不能限制本发明的保护范围。凡跟本发明权利要求范围所做的均等变化与修饰，均应属于本发明权利要求的涵盖范围。The above embodiments are only to illustrate the technical conception and characteristics of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (22)

  1. 一种电压互感器高精度测量方法，其特征在于，包括以下步骤：A high-precision measurement method for a voltage transformer, characterized in that it comprises the following steps:
    获取测量系统的系统误差；Obtain the systematic error of the measurement system;
    采用低压调频谐振的方式对所述测量系统进行串联谐振，获得谐振频率点；Perform series resonance on the measurement system by means of low-voltage frequency modulation resonance to obtain a resonance frequency point;
    根据所述谐振频率点计算谐振电感量；calculating the resonant inductance according to the resonant frequency point;
    根据所述谐振电感量对所述谐振设备进行调节，以使所述测量系统的工频谐振升压；adjusting the resonant device according to the resonant inductance, so as to boost the power frequency resonance of the measurement system;
    在所述测量系统的工频谐振升压时，获取被测电压互感器的精度数据；Acquiring the precision data of the voltage transformer under test when the power frequency resonance of the measuring system is boosted;
    根据所述系统误差和所述精度数据测量所述被测电压互感器的精度。and measuring the accuracy of the voltage transformer under test according to the system error and the accuracy data.
  2. 根据权利要求1所述的电压互感器高精度测量方法，其特征在于，所述获取测量系统的系统误差包括：The high-precision measurement method for a voltage transformer according to claim 1, wherein said acquisition of the systematic error of the measurement system comprises:
    对所述测量系统的测试回路进行负荷计算，获得所述测试回路的负荷；performing load calculation on the test loop of the measurement system to obtain the load of the test loop;
    基于所述测试回路的负荷，确定测试回路的测试设备及所述测试设备的设备参数；Based on the load of the test loop, determine the test equipment of the test loop and the equipment parameters of the test equipment;
    根据所述测试设备和所述设备参数确定所述测量系统；determining the measurement system based on the test equipment and the equipment parameters;
    对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差。The systematic error of the measurement system is calculated to obtain the systematic error of the measurement system.
  3. 根据权利要求2所述的电压互感器高精度测量方法，其特征在于，所述测量系统包括：电源控制器、转换单元、谐振设备、标准电压互感器、被测电压互感器以及误差测量装置；The high-precision measurement method for a voltage transformer according to claim 2, wherein the measurement system includes: a power controller, a conversion unit, a resonance device, a standard voltage transformer, a voltage transformer under test, and an error measurement device;
    所述电源控制器、所述转换单元以及所述谐振设备依次连接，所述标准电压互感器的输入端与所述谐振设备连接，所述标准电压互感器的输出端与所述误差测量装置连接，所述被测电压互感器一端与所述谐振设备连接、另一端与所述误差测量装置连接；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;
    所述电源控制器用于根据设置参数对输入电源并输出电压信号至所述转换单元；The power controller is used to input power and output voltage signals to the conversion unit according to the set parameters;
    所述转换单元用于对所述电压信号进行转换处理并输出至所述谐振设 备；The conversion unit is used to convert the voltage signal and output it to the resonance device;
    所述谐振设备用于进行调谐控制；the resonant device is used for tuning control;
    所述误差测量装置用于对所述标准电压器和所述被测电压互感器的精度进行测量。The error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
  4. 根据权利要求3所述的电压互感器高精度测量方法，其特征在于，所述转换单元包括：励磁变压器；The high-precision measurement method for a voltage transformer according to claim 3, wherein the conversion unit comprises: an excitation transformer;
    所述励磁变压器的初级绕组与所述电源控制器的输出端连接，所述励磁变压器的次级绕组与所述谐振设备的输入端连接。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.
  5. 根据权利要求4所述的电压互感器高精度测量方法，其特征在于，所述谐振设备包括：调感电抗器、可调电抗器、固定电抗器；The high-precision measurement method for a voltage transformer according to claim 4, wherein the resonance device includes: a tuning reactor, an adjustable reactor, and a fixed reactor;
    所述调感电抗器的第一端与所述励磁变压器的输出端连接，所述调感电抗器的第二端与所述标准电压器和被测电压互感器连接，所述可调电抗器和所述固定电抗器依次与所述调感电抗器并联。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.
  6. 根据权利要求3所述的电压互感器高精度测量方法，其特征在于，还包括：与所述被测电压互感器、用于向所述被测电压互感器提供负荷的负荷箱。The high-precision measuring method for a voltage transformer according to claim 3, further comprising: a load box connected with the voltage transformer under test and used to provide a load for the voltage transformer under test.
  7. 根据权利要求6所述的电压互感器高精度测量方法，其特征在于，所述系统误差包括：被测电压互感器的系统误差和标准电压互感器的系统误差；The high-precision measurement method for a voltage transformer according to claim 6, wherein the system error comprises: a system error of the voltage transformer under test and a system error of a standard voltage transformer;
    所述被测电压互感器的系统误差包括：第一系统误差、第二系统误差和第三系统误差；The system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
    所述第一系统误差为：在所述负荷箱处于额定负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
    所述第二系统误差为：在所述负荷箱处于下限负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
    所述第三系统误差为：在所述负荷箱处于空载时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差。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.
  8. 根据权利要求7所述的电压互感器高精度测量方法，其特征在于，所述对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差包括：The high-precision measurement method for a voltage transformer according to claim 7, wherein said calculating the systematic error of the measurement system and obtaining the systematic error of the measurement system comprises:
    在所述负荷箱处于额定负荷时，计算所述负荷箱的额定导纳；calculating the rated admittance of the load bank when the load bank is at rated load;
    获取所述被测电压互感器的额定实测电阻值；Obtain the rated measured resistance value of the voltage transformer under test;
    根据所述负荷箱的额定导纳和所述被测电压互感器的额定实测电阻值，获得所述第一系统误差。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.
  9. 根据权利要求8所述的电压互感器高精度测量方法，其特征在于，所述第一系统误差通过以下式子获得：The high-precision measurement method for a voltage transformer according to claim 8, wherein the first systematic error is obtained by the following formula:
    ε 75＝r*Y 1； ε 75 =r*Y 1 ;
    式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 1为所述负荷箱的额定导纳。 In the 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.
  10. 根据权利要求9所述的电压互感器高精度测量方法，其特征在于，所述负荷箱的额定导纳通过以下式子获得：The high-precision measurement method for a voltage transformer according to claim 9, wherein the rated admittance of the load box is obtained by the following formula:
    Figure PCTCN2022103131-appb-100001
    Figure PCTCN2022103131-appb-100001
    式中，Y 1为所述负荷箱的额定导纳；
    Figure PCTCN2022103131-appb-100002
    为功率因数余弦值；U 2为相电压值；
    Figure PCTCN2022103131-appb-100003
    为功率因数正弦值；j为虚数的符号。     In the formula, Y1 is the rated admittance of the load box;
    Figure PCTCN2022103131-appb-100002
    is the power factor cosine value; U 2 is the phase voltage value;
    Figure PCTCN2022103131-appb-100003
    is the sine value of the power factor; j is the sign of the imaginary number.
  11. 根据权利要求7所述的电压互感器高精度测量方法，其特征在于，所述对所述测量系统的系统误差进行计算，获得所述测量系统的系统误差包括：The high-precision measurement method for a voltage transformer according to claim 7, wherein said calculating the systematic error of the measurement system and obtaining the systematic error of the measurement system comprises:
    在所述负荷箱处于下限负荷时，计算所述负荷箱的下限导纳；calculating the lower limit admittance of the load box when the load box is at the lower limit load;
    获取所述被测电压互感器的下限实测电阻值；Obtaining the lower limit measured resistance value of the voltage transformer under test;
    根据所述负荷箱的下限导纳和所述被测电压互感器的下限实测电阻值，获得所述第二系统误差。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.
  12. 根据权利要求11所述的电压互感器高精度测量方法，其特征在于，所述第二系统误差通过以下式子获得；The high-precision measuring method for a voltage transformer according to claim 11, wherein the second systematic error is obtained by the following formula;
    ε 25＝r*Y 2； ε 25 =r*Y 2 ;
    式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 2为所述负荷箱的下限导纳。 In the 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.
  13. 根据权利要求12所述的电压互感器高精度测量方法，其特征在于，所述负荷箱的下限导纳通过以下式子获得：The high-precision measurement method for a voltage transformer according to claim 12, wherein the lower limit admittance of the load box is obtained by the following formula:
    Figure PCTCN2022103131-appb-100004
    Figure PCTCN2022103131-appb-100004
    式中，Y 2为所述负荷箱的下限导纳；
    Figure PCTCN2022103131-appb-100005
    为功率因数余弦值；U 2为相电压值；
    Figure PCTCN2022103131-appb-100006
    为功率因数正弦值；j为虚数的符号。     In the formula, Y 2 is the lower limit admittance of the load box;
    Figure PCTCN2022103131-appb-100005
    is the power factor cosine value; U 2 is the phase voltage value;
    Figure PCTCN2022103131-appb-100006
    is the sine value of the power factor; j is the sign of the imaginary number.
  14. 一种电压互感器高精度测量系统，其特征在于，包括：电源控制器、转换单元、谐振设备、标准电压互感器、被测电压互感器以及误差测量装置；A voltage transformer high-precision measurement system, characterized in that it includes: a power controller, a conversion unit, a resonance device, a standard voltage transformer, a measured voltage transformer, and an error measurement device;
    所述电源控制器、所述转换单元以及所述谐振设备依次连接，所述标准电压互感器的输入端与所述谐振设备连接，所述标准电压互感器的输出端与所述误差测量装置连接，所述被测电压互感器一端与所述谐振设备连接、另一端与所述误差测量装置连接；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;
    所述电源控制器用于根据设置参数对输入电源并输出电压信号至所述转换单元；The power controller is used to input power and output voltage signals to the conversion unit according to the set parameters;
    所述转换单元用于对所述电压信号进行转换处理并输出至所述谐振设备；The conversion unit is used to convert the voltage signal and output it to the resonance device;
    所述谐振设备用于进行调谐控制；the resonant device is used for tuning control;
    所述误差测量装置用于对所述标准电压器和所述被测电压互感器的精度进行测量。The error measuring device is used to measure the accuracy of the standard voltage transformer and the voltage transformer under test.
  15. 根据权利要求14所述的电压互感器高精度测量系统，其特征在于，所述转换单元包括：励磁变压器；The high-precision measurement system for voltage transformers according to claim 14, wherein the conversion unit comprises: an excitation transformer;
    所述励磁变压器的初级绕组与所述电源控制器的输出端连接，所述励磁变压器的次级绕组与所述谐振设备的输入端连接。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.
  16. 根据权利要求15所述的电压互感器高精度测量系统，其特征在于，所述谐振设备包括：调感电抗器、可调电抗器、固定电抗器；The high-precision measurement system for voltage transformers according to claim 15, wherein the resonant device includes: a tuning reactor, an adjustable reactor, and a fixed reactor;
    所述调感电抗器的第一端与所述励磁变压器的输出端连接，所述调感电抗器的第二端与所述标准电压器和被测电压互感器连接，所述可调电抗器和所述固定电抗器依次与所述调感电抗器并联。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.
  17. 根据权利要求14所述的电压互感器高精度测量系统，其特征在于，还包括：与所述被测电压互感器、用于向所述被测电压互感器提供负荷的负荷箱。The high-precision measurement system for a voltage transformer according to claim 14, further comprising: a load box connected with the voltage transformer under test and used to provide a load for the voltage transformer under test.
  18. 根据权利要求17所述的电压互感器高精度测量系统，其特征在于，所述系统误差包括：被测电压互感器的系统误差和标准电压互感器的系统误差；The high-precision measurement system for a voltage transformer according to claim 17, wherein the system error includes: a system error of the voltage transformer under test and a system error of a standard voltage transformer;
    所述被测电压互感器的系统误差包括：第一系统误差、第二系统误差和第三系统误差；The system error of the voltage transformer under test includes: a first system error, a second system error and a third system error;
    所述第一系统误差为：在所述负荷箱处于额定负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
    所述第二系统误差为：在所述负荷箱处于下限负荷时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差；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;
    所述第三系统误差为：在所述负荷箱处于空载时，所述被测电压互感器的二次端到所述误差测量装置引线压降引起的误差。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.
  19. 根据权利要求18所述的电压互感器高精度测量系统，其特征在于，所述第一系统误差通过以下式子获得：The high-precision measurement system for voltage transformers according to claim 18, wherein the first systematic error is obtained by the following formula:
    ε 75＝r*Y 1； ε 75 =r*Y 1 ;
    式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 1为所述负荷箱的额定导纳。 In the 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.
  20. 根据权利要求19所述的电压互感器高精度测量系统，其特征在于，所述负荷箱的额定导纳通过以下式子获得：The high-precision measurement system for voltage transformers according to claim 19, wherein the rated admittance of the load box is obtained by the following formula:
    Figure PCTCN2022103131-appb-100007
    Figure PCTCN2022103131-appb-100007
    式中，Y 1为所述负荷箱的额定导纳；
    Figure PCTCN2022103131-appb-100008
    为功率因数余弦值；U 2为相电压值；
    Figure PCTCN2022103131-appb-100009
    为功率因数正弦值；j为虚数的符号。     In the formula, Y1 is the rated admittance of the load box;
    Figure PCTCN2022103131-appb-100008
    is the power factor cosine value; U 2 is the phase voltage value;
    Figure PCTCN2022103131-appb-100009
    is the sine value of the power factor; j is the sign of the imaginary number.
  21. 根据权利要求19所述的电压互感器高精度测量系统，其特征在于，所述第二系统误差通过以下式子获得；The high-precision measurement system for voltage transformers according to claim 19, wherein the second system error is obtained by the following formula;
    ε 25＝r*Y 2； ε 25 =r*Y 2 ;
    式中，r为所述被测电压互感器二次端到所述误差测量装置的引线电阻；Y 2为所述负荷箱的下限导纳。 In the 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.
  22. 根据权利要求21所述的电压互感器高精度测量系统，其特征在于，所述负荷箱的下限导纳通过以下式子获得：The high-precision measurement system for voltage transformers according to claim 21, wherein the lower limit admittance of the load box is obtained by the following formula:
    Figure PCTCN2022103131-appb-100010
    Figure PCTCN2022103131-appb-100010
    式中，Y 2为所述负荷箱的下限导纳；
    Figure PCTCN2022103131-appb-100011
    为功率因数余弦值；U 2为相电压值；
    Figure PCTCN2022103131-appb-100012
    为功率因数正弦值；j为虚数的符号。     In the formula, Y 2 is the lower limit admittance of the load box;
    Figure PCTCN2022103131-appb-100011
    is the power factor cosine value; U 2 is the phase voltage value;
    Figure PCTCN2022103131-appb-100012
    is the sine value of the power factor; j is the sign of the imaginary number.
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LUO CHUAN-XIAN , XU ZHAO-YANG , SHEN HONG-TAO , SHI LUN: "The Error Test of On-Site 500kV Voltage Transformer", ELECTRICAL MEASUREMENT & INSTRUMENTATION, vol. 41, no. 468, 25 December 2004 (2004-12-25), pages 21 - 24, XP093041391, ISSN: 1001-1390 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115932702A (en) * 2023-03-14 2023-04-07 武汉格蓝若智能技术股份有限公司 Voltage transformer online operation calibration method and device based on virtual standard device

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