CN110967660A - Method and system for detecting current transformer - Google Patents
Method and system for detecting current transformer Download PDFInfo
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- CN110967660A CN110967660A CN201911087718.8A CN201911087718A CN110967660A CN 110967660 A CN110967660 A CN 110967660A CN 201911087718 A CN201911087718 A CN 201911087718A CN 110967660 A CN110967660 A CN 110967660A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a method and a system for detecting a current transformer, and belongs to the technical field of electrical measurement. The method comprises the following steps: determining the frequency band of a current transformer to be tested, selecting an access power supply according to the frequency band and enabling the power supply to be accessed to a standard transformer; acquiring current data of a current transformer to be tested and current data of a standard transformer, and determining an error between the current data of the current transformer to be tested and the current data of the standard transformer; and detecting the current transformer according to the error. The detection means and the detection frequency range of the invention meet the detection requirement of the current full-frequency band, and have great engineering value for detecting the current measuring device.
Description
Technical Field
The present invention relates to the field of electrical measurement technology, and more particularly, to a method and system for detecting a current transformer.
Background
With the rapid development of electronic technology, the requirement for measuring and calibrating broadband current is increasing. In electrical engineering, partial discharge detection, power system traveling wave measurement, lightning discharge and impulse current characteristic research can be carried out on various waveforms in all directions only by means of a high-precision broadband current measurement technology, and safe operation of electrical equipment is guaranteed.
The existing current detection device mostly uses a single sensor as a standard device, and compares the current detection device with output data of a tested object, thereby detecting errors, and the existing current detection device has the problems that because the standard devices of different principles only have better accuracy in a certain frequency band, a shunt is used as the standard device, the shunt can not measure high-frequency signals, a mutual inductor with a special iron core is used as the standard device, the iron core has magnetic saturation, the frequency is limited, the direct-current frequency band can not be measured, the high frequency has larger errors, a Rogowski coil is used as the standard device, although the response speed of the Rogowski coil is high, the measurement accuracy is not high, and the low-frequency signals can not be measured. If the full-band sensing characteristics of the sensor to be detected need to be detected, related technical means are lacked at present.
Disclosure of Invention
In order to solve the above problem, the present invention provides a method for detecting a current transformer, including:
determining the frequency band of a current transformer to be tested, selecting an access power supply according to the frequency band and enabling the power supply to be accessed to a standard transformer;
acquiring current data of a current transformer to be tested and current data of a standard transformer, and determining an error between the current data of the current transformer to be tested and the current data of the standard transformer;
and detecting the current transformer according to the error.
Optionally, the power supply includes: 0-50 Hz low-frequency power supply, 50-2.5 kHz intermediate-frequency power supply and 2.5-1 MHz high-frequency power supply.
Optionally, the frequency band includes:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency.
Optionally, when the frequency band is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency range is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency range is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is accessed to a 2.5 kHz-1 MHz high frequency power supply, and the accessed standard mutual inductor is a high frequency standard mutual inductor.
Optionally, the error between the current data of the current transformer to be measured and the current data of the standard transformer is determined by using a current error calibrator.
The present invention also provides a system for detecting a current transformer, comprising:
the frequency band selection module is used for determining the frequency band of the current transformer to be tested, controlling the access of a power supply according to the frequency band and controlling the access of the power supply to a standard transformer;
the parameter acquisition module is used for acquiring current data of the current transformer to be detected and current data of the standard transformer and determining an error between the current data of the current transformer to be detected and the current data of the standard transformer;
and the detection module is used for detecting the current transformer according to the error.
Optionally, the power supply includes: 0-50 Hz low-frequency power supply, 50-2.5 kHz intermediate-frequency power supply and 2.5-1 MHz high-frequency power supply.
Optionally, the frequency band includes:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency.
Optionally, when the frequency band is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency range is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency range is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is accessed to a 2.5 kHz-1 MHz high frequency power supply, and the accessed standard mutual inductor is a high frequency standard mutual inductor.
Optionally, the error between the current data of the current transformer to be measured and the current data of the standard transformer is determined by using a current error calibrator.
The detection means and the detection frequency range of the invention meet the detection requirement of the current full-frequency band, and have great engineering value for detecting the current measuring device.
Drawings
FIG. 1 is a flow chart of a method for testing a current transformer in accordance with the present invention;
FIG. 2 is a schematic diagram of a method for testing a current transformer in accordance with the present invention;
FIG. 3 is a diagram of a test device for acquiring current data of a low-frequency current transformer to be tested according to a method for detecting the current transformer of the present invention;
FIG. 4 is a diagram of a test device for acquiring current data of a current transformer to be tested at an intermediate frequency according to a method for detecting the current transformer of the present invention;
FIG. 5 is a diagram of a test apparatus for acquiring current data of a high-frequency current transformer to be tested according to a method for detecting a current transformer of the present invention;
fig. 6 is a block diagram of a system for testing a current transformer according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for detecting a current transformer, as shown in fig. 1, comprising:
determining the frequency band of a current transformer to be tested, selecting an access power supply according to the frequency band and enabling the power supply to be accessed to a standard transformer;
a frequency band comprising:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency;
a power supply, comprising: a 0-50 Hz low-frequency power supply, a 50 Hz-2.5 kHz medium-frequency power supply and a 2.5 kHz-1 MHz high-frequency power supply;
the principle of band-division detection in the method of the present invention is shown in fig. 2:
when the frequency range is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency range is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency band is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is accessed to a 2.5 kHz-1 MHz high frequency power supply, and the accessed standard mutual inductor is a high frequency standard mutual inductor;
acquiring current data of a current transformer to be tested and current data of a standard transformer, and determining an error between the current data of the current transformer to be tested and the current data of the standard transformer;
detecting a current transformer according to the error;
and determining the error between the current data of the current transformer to be detected and the current data of the standard transformer by using a current error calibrator.
In order to realize the detection of the current in the full frequency band and the detection of the measurement precision of each frequency band of the current transformer;
for low-frequency current detection, the invention selects a zero-flux current sensor as a standard device, and uses a digital quantity calibrator as a comparison instrument to obtain a low-frequency current device, as shown in fig. 3:
in the technical route of the checking process, firstly, a high-precision power supply provides standard current for a tested mutual inductor (TMR circuit mutual inductor) and a standard mutual inductor, a standard side induction signal transmits a current signal into an evaluation unit in an error measurement device through an A/D converter, a tested side induction signal transmits into an evaluation unit in the error measurement device through a converter and a merging unit, meanwhile, in order to ensure that the models of the tested side and the standard side are synchronous, a clock system provides synchronous signals for the tested side and the standard side, and finally, the mutual inductor error is calculated and solved through the evaluation unit in the error measurement device, wherein the formula is as follows:
in the formula: krpRepresenting the transformation ratio of a standard current transformer; u shapepRepresenting the secondary output voltage of a standard current transformer; i issRepresenting the measured output value of the current transformer under test.
For the wide-frequency-band current detection, the invention selects a two-stage current transformer based on electronic compensation as a standard device, and uses a lock-in amplifier as a comparison instrument to obtain a medium-frequency current device, as shown in fig. 4, a high-power harmonic current generator generates medium-frequency-band current, the current comparison standard based on electronic compensation and a tested transformer respectively perform current measurement, and finally, the lock-in amplifier SR830 performs transformer error comparison.
For high-frequency pulse current detection, the Rogowski coil is selected as a standard device, an upper computer and a digital recorder are used as comparison instruments, and a high-frequency current device is obtained, as shown in fig. 5, the device mainly comprises a charging control unit and an impact current generator device, and measuring instruments widely used by the impact current measuring device at present are a current divider and the Rogowski coil. The shunt is connected in the main discharge loop in a series connection mode, the essence of the shunt is a sampling resistor, and the current value in the primary loop is converted after voltage signals at two ends of the shunt are measured; the Rogowski coil adopts the principle of electromagnetic induction, when current passes through the conductor, corresponding voltage is induced in the Rogowski coil, the hollow part in the middle of the Rogowski coil is used for penetrating through the current conductor, and the current-voltage conversion proportion of the Rogowski coil is determined by measuring the voltages induced at two ends of the Rogowski coil and the winding structure parameters of the Rogowski coil, so that the size of the impact current in the primary loop is determined. Voltage signals measured by the current divider and the Rogowski coil are transmitted to a signal acquisition and analysis system through a measuring cable, and are analyzed and calculated by a digital acquisition system, and finally, parameters of a current waveform are obtained: amplitude, time, etc.
According to the invention, by selecting the standard instrument and carrying out test measurement on the standard instrument transformer, the test result shows that:
the detection can reach 0.005 level in a direct current section of 0-50 Hz;
in the current measurement of 50-2500 Hz, the specific difference is not more than 106ppm, the angular difference is within 9.1', and the angular difference is 0.01 grade;
the linearity is measured within 1% in 4 k-1 MHz impulse current measurement.
The invention reaches the national current proportion standard and can simultaneously detect the current in the wide frequency band of 0-1 MHz, thereby providing a measurement basis for the development of a wide frequency current system and having a certain engineering value in the detection research of the wide frequency band current.
The present invention also proposes a system 200 for detecting a current transformer, as shown in fig. 6, comprising:
the frequency band selection module 201 is used for determining the frequency band of the current transformer to be tested, controlling the power supply to be accessed according to the frequency band and controlling the power supply to be accessed to the standard transformer;
the parameter acquisition module 202 is used for acquiring current data of the current transformer to be detected and current data of the standard transformer and determining an error between the current data of the current transformer to be detected and the current data of the standard transformer;
and the detection module 203 detects the current transformer according to the error.
A power supply, comprising: 0-50 Hz low-frequency power supply, 50-2.5 kHz intermediate-frequency power supply and 2.5-1 MHz high-frequency power supply.
A frequency band comprising:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency.
When the frequency range is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency range is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency range is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is accessed to a 2.5 kHz-1 MHz high frequency power supply, and the accessed standard mutual inductor is a high frequency standard mutual inductor.
And determining the error between the current data of the current transformer to be detected and the current data of the standard transformer by using a current error calibrator.
The detection means and the detection frequency range of the invention meet the detection requirement of the current full-frequency band, and have great engineering value for detecting the current measuring device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for detecting a current transformer, the method comprising:
determining the frequency band of a current transformer to be tested, selecting an access power supply according to the frequency band and enabling the power supply to be accessed to a standard transformer;
acquiring current data of a current transformer to be tested and current data of a standard transformer, and determining an error between the current data of the current transformer to be tested and the current data of the standard transformer;
and detecting the current transformer according to the error.
2. The method of claim 1, the power supply, comprising: 0-50 Hz low-frequency power supply, 50-2.5 kHz intermediate-frequency power supply and 2.5-1 MHz high-frequency power supply.
3. The method of claim 1, the frequency bin, comprising:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency.
4. The method according to claim 1, when the frequency band is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency band is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency band is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is connected with a 2.5 kHz-1 MHz high frequency power supply, and the connected standard mutual inductor is a high frequency standard mutual inductor.
5. The method of claim 1, wherein the error between the current data of the current transformer under test and the current data of the standard transformer is determined using a current error verifier.
6. A system for detecting a current transformer, the system comprising:
the frequency band selection module is used for determining the frequency band of the current transformer to be tested, controlling the access of a power supply according to the frequency band and controlling the access of the power supply to a standard transformer;
the parameter acquisition module is used for acquiring current data of the current transformer to be detected and current data of the standard transformer and determining an error between the current data of the current transformer to be detected and the current data of the standard transformer;
and the detection module is used for detecting the current transformer according to the error.
7. The system of claim 6, the power supply, comprising: 0-50 Hz low-frequency power supply, 50-2.5 kHz intermediate-frequency power supply and 2.5-1 MHz high-frequency power supply.
8. The system of claim 6, the frequency band, comprising:
0-50 Hz low frequency, 50 Hz-2.5 kHz intermediate frequency and 2.5 kHz-1 MHz high frequency.
9. The system of claim 6, when the frequency band is 0-50 Hz low frequency, the mutual inductor to be tested is connected with a 0-50 Hz low frequency power supply, and the connected standard mutual inductor is a low frequency standard mutual inductor;
when the frequency band is 50 Hz-2.5 kHz intermediate frequency, the mutual inductor to be tested is accessed to a 50 Hz-2.5 kHz intermediate frequency power supply, and the accessed standard mutual inductor is an intermediate frequency standard mutual inductor;
when the frequency band is 2.5 kHz-1 MHz high frequency, the mutual inductor to be tested is connected with a 2.5 kHz-1 MHz high frequency power supply, and the connected standard mutual inductor is a high frequency standard mutual inductor.
10. The system of claim 6, wherein the error between the current data of the current transformer under test and the current data of the standard transformer is determined using a current error verifier.
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| CN112327237A (en) * | 2020-11-17 | 2021-02-05 | 国网四川省电力公司电力科学研究院 | Error calibration system and method for broadband wide-range current transformer |
| CN113281693A (en) * | 2021-05-08 | 2021-08-20 | 中国电力科学研究院有限公司 | Method and system for improving performance parameters and consistency of current transformer |
| CN113884965A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Distribution network electromagnetic current transformer broadband characteristic test method and device |
| CN118584169A (en) * | 2024-08-02 | 2024-09-03 | 国网天津市电力公司滨海供电分公司 | Non-opening cabinet door type current transformer transformation ratio acquisition and reading device and method |
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