CN113447878A - Error measuring equipment and method for current transformer - Google Patents
Error measuring equipment and method for current transformer Download PDFInfo
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- 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 an error measuring device and method of a current transformer, wherein the device comprises: the current transformer to be detected, the first standard current transformer, the second standard current transformer and the differential error measuring device; controlling the current source to output current to a preset number of percentage current points, and reading the ratio difference value and the phase difference of the current transformer to be detected through the differential error measuring device to obtain the errors of the current transformer to be detected under the preset number of percentage current points; the invention can realize the error measurement of 0.1-1% current point of the current transformer, solves the problem that the low-end errors of the wide-range current transformer and the wide-range standard current transformer are difficult to calibrate, and can provide technical support for the low-end measurement performance value traceability of the wide-range current transformer.
Description
Technical Field
The present invention relates to the field of error measurement technologies, and more particularly, to an error measurement apparatus and method for a current transformer.
Background
With the development of energy internet construction and modern industry, a large amount of distributed energy is connected into a power grid, the load of a power grid user also shows a diversified trend, and the current fluctuation range is increasingly enlarged. However, the conventional current transformer is difficult to satisfy the electric energy metering requirements of both the maximum load and the minimum load, and it is urgently needed to further widen the measurement range of the current transformer for metering and realize the current measurement capability with higher accuracy in a wider range. The wide-range current transformer for metering expands the accurate metering range of current from (1% -120%) rated current to (0.1% -200%) rated current based on new iron core materials and an error compensation technology, and the specific value difference and the phase difference limit value reach +/-0.2% and +/-10', so that the accuracy of electric energy metering is effectively ensured.
At present, the wide-range current transformer has insufficient checking capability. As mentioned above, the current measurement technical mechanisms at all levels of province, city, region and county, including electric academy and measurement center, and the current transformers and current proportion standard calibration capability of transformer manufacturers can only meet the rated measurement range of 1% -120%. Particularly, when the primary current of the current transformer is below 1% of the rated current, effective verification means and methods are lacked, so that the effectiveness of the measurement result of the 0.1% -1% current point in the working state cannot be guaranteed.
Disclosure of Invention
The invention provides error measuring equipment and method of a current transformer, and aims to solve the problem that how to realize the difficulty in calibrating the ground end error of the current transformer.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided an error measuring apparatus of a current transformer, the apparatus including: the current transformer to be detected, the first standard current transformer, the second standard current transformer and the differential error measuring device; wherein the content of the first and second substances,
two ends of a primary side winding of the first standard current transformer are respectively connected with a current source and one end of a primary side winding of the current transformer to be detected; one end of a secondary side winding of the first standard current transformer is connected with a standard current port of the differential error measuring device, and the other end of the secondary side winding of the first standard current transformer is respectively connected with a differential current port of the differential error measuring device and one end of a secondary side winding of the second standard current transformer;
the other end of the primary side winding of the current transformer to be detected is connected with the current source; the secondary side winding of the current transformer to be detected is cascaded with the primary side winding of the second standard current transformer;
the other end of the secondary side winding of the second standard current transformer is connected with a detected current port of the differential error measuring device;
and controlling the current source to output current to a preset number of percentage current points, and reading the ratio difference value and the phase difference of the current transformer to be detected through the differential error measuring device to obtain the error of the current transformer to be detected under the preset number of percentage current points.
Preferably, wherein said first standard current transformerHas a transformation ratio of K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
Preferably, the preset number M ranges from 0.1 to 1.
Preferably, wherein said I2Is 5A or A.
According to another aspect of the present invention, there is provided an error measurement method of a current transformer based on the error measurement apparatus of a current transformer as described above, the method including:
calculating the transformation ratios of the current transformer to be detected, the first standard current transformer and the second current transformer according to the preset number of percentage current points;
carrying out transformation ratio configuration according to the transformation ratios of the current transformer to be detected, the first standard current transformer and the second standard current transformer;
and controlling the current source to output current to a preset number of percentage current points, reading the ratio difference value and the phase difference of the detected current transformer through the differential error measuring device, and acquiring the error of the detected current transformer under the preset number of percentage current points.
Preferably, the transformation ratio of the first standard current transformer is K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
Preferably, the preset number M ranges from 0.1 to 1.
Preferably, wherein said I2Is 5A or 1A.
The invention provides an error measuring device and method of a current transformer, wherein the device comprises: the current transformer to be detected, the first standard current transformer, the second standard current transformer and the differential error measuring device; controlling the current source to output current to a preset number of percentage current points, and reading the ratio difference value and the phase difference of the current transformer to be detected through the differential error measuring device to obtain the errors of the current transformer to be detected under the preset number of percentage current points; the invention can realize the error measurement of 0.1-1% current point of the current transformer, solves the problem that the low-end errors of the wide-range current transformer and the wide-range standard current transformer are difficult to calibrate, and can provide technical support for the low-end measurement performance value traceability of the wide-range current transformer.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic configuration diagram of an error measurement apparatus 100 of a current transformer according to an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of an error measuring apparatus of a current transformer according to an embodiment of the present invention;
fig. 3 is a flow chart of an error measurement method 300 of a current transformer according to an embodiment of 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.
Fig. 1 is a schematic structural diagram of an error measurement apparatus 100 of a current transformer according to an embodiment of the present invention. As shown in fig. 1, an error measurement device for a current transformer according to an embodiment of the present invention includes: the current transformer to be detected, the first standard current transformer, the second standard current transformer and the differential error measuring device; controlling the current source to output current to a preset number of percentage current points, and reading the ratio difference value and the phase difference of the current transformer to be detected through the differential error measuring device to obtain the errors of the current transformer to be detected under the preset number of percentage current points; the invention can realize the error measurement of 0.1-1% current point of the current transformer, solves the problem that the low-end errors of the wide-range current transformer and the wide-range standard current transformer are difficult to calibrate, and can provide technical support for the low-end measurement performance value traceability of the wide-range current transformer. The error measuring apparatus 100 for a current transformer according to an embodiment of the present invention includes: a current transformer to be detected 101, a first standard current transformer 102, a second standard current transformer 103 and a differential error measuring device 104; the two ends of the primary winding of the first standard current transformer 102 are respectively connected with a current source and one end of the primary winding of the current transformer 101 to be detected; one end of the secondary side winding of the first standard current transformer is connected with the standard current port of the differential error measuring device 104, and the other end of the secondary side winding of the first standard current transformer is respectively connected with the differential current port of the differential error measuring device and one end of the secondary side winding of the second standard current transformer; the other end of the primary side winding of the current transformer 101 to be detected is connected with the current source; the secondary side winding of the current transformer to be detected is cascaded with the primary side winding of the second standard current transformer; the other end of the secondary side winding of the second standard current transformer 103 is connected with a detected current port of the differential error measuring device.
Preferably, the current source is controlled to output current to a preset number of percentage current points, and the differential error measuring device is used for reading the ratio difference and the phase difference of the current transformer to be detected, so as to obtain the error of the current transformer to be detected under the preset number of percentage current points.
Preferably, the transformation ratio of the first standard current transformer is K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a In the specification, M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
Preferably, the preset number M ranges from 0.1 to 1.
Preferably, wherein said I2Is 5A or 1A.
The error measuring equipment adopts the standard current transformer with the transformation ratio of one-N times of the transformation ratio of the current transformer to be detected as the standard device, and the current transformer to be detected is cascaded with the standard current transformer with the transformation ratio of N times of the transformation ratio, so that the transformation ratios of the two sides to be detected are balanced, and the error measurement of 0.1% -1% of current points of the current transformer is realized.
Referring to fig. 2, the transformation ratio coefficient of the M% current point of 1% or less is N1/M, and K/I is the transformation ratio according to the current transformer to be tested2(wherein I)25A and 1A) and selecting the transformation ratio of K/N/I2Standard current transformer CT01Connecting its secondary non-polar end and polar end to standard current port T of error measuring device0Sum and difference current port K, standard current transformer CT01The primary windings are normally connected in a manner of checking a common current transformer.
CT (current transformer) of current transformer to be detectedXThe primary windings are normally connected according to the mode of checking the common current transformer, and the current transformer CT is checkedXSecond cascade transformation ratio of M/I2Standard current transformer CT02Primary winding of (2), standard current transformer CT02Detected current port T of differential error measuring device with secondary non-polar end and polar end connectedXAnd a current port K for differential measurement.
By controlling the current source to output current to M% current point, by measuring the errorMeasuring device reading current transformer CTXThe low-end error of the M% current point wide-range current transformer or the wide-range standard current transformer with the current point lower than 1% is obtained through the ratio difference and the phase difference.
In the present invention, the transformation ratio of the current transformer to be tested is assumed to be K/I, taking the calibration M of fig. 2 as 0.1% current point error as an example2100/5, the step of performing an error measurement includes:
firstly, if the transformation ratio coefficient is calculated to be N is 1/0.1 is 10, a standard current transformer CT is selected01Has a transformation ratio of K/N/I2＝(100/10)/5 ═ 10/5, and the secondary non-polar end and the polar end are respectively connected to the standard current port T of the differential error measuring device0Sum and difference current port K, standard current transformer CT01The non-polar end and the polar end of the primary winding are respectively connected with a power supply and the polar end of the primary winding of the current transformer to be detected.
Then, a standard current transformer with a transformation ratio of 0.1/5 is selected as the CT02Among them, standard current transformer CT02The impedance of the primary winding of the transformer meets the requirement of the secondary load of the current transformer to be detected, and the standard current transformer CT02The primary winding has the same polarity and is cascaded to the secondary winding of the current transformer to be detected, and the secondary non-polar end and the polar end are respectively connected to the standard current port T of the error measuring deviceXAnd a current port K for differential measurement.
Finally, the current source is controlled to output current to a 0.1% current point, and the CT of the current transformer to be detected is read through a differential error measuring deviceXThe error of the current point of 0.1% of the low end of the wide-range current transformer can be obtained by the ratio difference and the phase difference, and the error of the other current points of less than 1% can be obtained by the same method.
Fig. 3 is a flow chart of an error measurement method 300 of a current transformer according to an embodiment of the present invention. As shown in fig. 3, the error measurement method 300 for a current transformer of the error measurement device based on a current transformer according to the embodiment of the present invention starts with step 301, and calculates the transformation ratios of the current transformer to be tested, the first standard current transformer and the second current transformer according to a preset number of percentage current points in step 301.
Preferably, the transformation ratio of the first standard current transformer is K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a In the specification, M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
Preferably, the preset number M ranges from 0.1 to 1.
Preferably, wherein said I2Is 5A or 1A.
In step 302, the transformation ratio is configured according to the transformation ratios of the current transformer to be detected, the first standard current transformer and the second standard current transformer.
In step 303, the current source is controlled to output current to a preset number of percentage current points, and the differential error and the phase difference of the current transformer to be detected are read by the differential error measuring device, so as to obtain the error of the current transformer to be detected at the preset number of percentage current points.
The error measurement method 300 of the current transformer according to the embodiment of the present invention corresponds to the error measurement apparatus 100 of the current transformer according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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 (8)
1. An error measuring apparatus of a current transformer, characterized in that the apparatus comprises: the current transformer to be detected, the first standard current transformer, the second standard current transformer and the differential error measuring device; wherein the content of the first and second substances,
two ends of a primary side winding of the first standard current transformer are respectively connected with a current source and one end of a primary side winding of the current transformer to be detected; one end of a secondary side winding of the first standard current transformer is connected with a standard current port of the differential error measuring device, and the other end of the secondary side winding of the first standard current transformer is respectively connected with a differential current port of the differential error measuring device and one end of a secondary side winding of the second standard current transformer;
the other end of the primary side winding of the current transformer to be detected is connected with the current source; the secondary side winding of the current transformer to be detected is cascaded with the primary side winding of the second standard current transformer;
the other end of the secondary side winding of the second standard current transformer is connected with a detected current port of the differential error measuring device;
and controlling the current source to output current to a preset number of percentage current points, and reading the ratio difference value and the phase difference of the current transformer to be detected through the differential error measuring device to obtain the error of the current transformer to be detected under the preset number of percentage current points.
2. The apparatus of claim 1, wherein the first standard current is mutually inductiveThe transformation ratio of the device is K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
3. The apparatus according to claim 2, wherein the predetermined number M is in a range of 0.1-1.
4. The apparatus of claim 2, wherein I is2Is 5A or 1A.
5. An error measurement method of a current transformer based on the error measurement apparatus of the current transformer according to any one of claims 1 to 4, characterized in that the method comprises:
calculating the transformation ratios of the current transformer to be detected, the first standard current transformer and the second current transformer according to the preset number of percentage current points;
carrying out transformation ratio configuration according to the transformation ratios of the current transformer to be detected, the first standard current transformer and the second standard current transformer;
and controlling the current source to output current to a preset number of percentage current points, reading the ratio difference value and the phase difference of the detected current transformer through the differential error measuring device, and acquiring the error of the detected current transformer under the preset number of percentage current points.
6. The method of claim 5, wherein the first standard current transformer has a transformation ratio of K/N/I2The transformation ratio of the current transformer to be detected is K/I2N is 1/M, and the transformation ratio of the second standard current transformer is M/I2(ii) a Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i is2The rated secondary current value of the current transformer to be detected is obtained.
7. The method of claim 6, wherein the predetermined number M is in a range of 0.1-1.
8. The method of claim 6, wherein I is2Is 5A or 1A.
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| CN115308666A (en) * | 2021-12-13 | 2022-11-08 | 中国电力科学研究院有限公司 | Device and method for measuring error of wide-range current transformer |
| CN115508766A (en) * | 2022-11-18 | 2022-12-23 | 中国电力科学研究院有限公司 | Error compensation method and related device for standard current transformer |
| CN115524657A (en) * | 2022-11-24 | 2022-12-27 | 中国电力科学研究院有限公司 | Metering error analysis method, metering device and self-calibration method of electric energy meter |
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| CN115308666B (en) * | 2021-12-13 | 2024-05-17 | 中国电力科学研究院有限公司 | Device and method for measuring error of wide-range current transformer |
| CN115508766A (en) * | 2022-11-18 | 2022-12-23 | 中国电力科学研究院有限公司 | Error compensation method and related device for standard current transformer |
| CN115524657A (en) * | 2022-11-24 | 2022-12-27 | 中国电力科学研究院有限公司 | Metering error analysis method, metering device and self-calibration method of electric energy meter |
| CN115524657B (en) * | 2022-11-24 | 2023-03-10 | 中国电力科学研究院有限公司 | Metering error analysis method, metering device and self-calibration method of electric energy meter |
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