CN113447878B - Error measurement equipment and method for current transformer - Google Patents
Error measurement equipment and method for current transformer Download PDFInfo
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- CN113447878B CN113447878B CN202110680676.XA CN202110680676A CN113447878B CN 113447878 B CN113447878 B CN 113447878B CN 202110680676 A CN202110680676 A CN 202110680676A CN 113447878 B CN113447878 B CN 113447878B
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- 238000005259 measurement Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000009466 transformation Effects 0.000 claims description 38
- 238000004804 winding Methods 0.000 claims description 36
- 238000002591 computed tomography Methods 0.000 description 14
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000000691 measurement method Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
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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
Abstract
The application discloses an error measurement device and method of a current transformer, wherein the device comprises: the device comprises a detected current transformer, a first standard current transformer, a second standard current transformer and a differential measurement error measuring device; the current source is controlled to output current to a preset number of percentage current points, and the ratio difference value and the phase difference of the detected current transformer are read through the difference measurement device, so that the error of the detected current transformer under the preset number of percentage current points is obtained; the application can realize the error measurement of 0.1% -1% current points 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 tracing the low-end metering energy value of the wide-range current transformer.
Description
Technical Field
The present application relates to the field of error measurement technologies, and more particularly, to an error measurement apparatus and method of a current transformer.
Background
With the construction of energy Internet and the development of modern industry, distributed energy is largely connected into a power grid, the load of power grid users also presents a diversified trend, and the current fluctuation range is increased increasingly. However, it is difficult to combine the electric energy metering requirements of both the extremely large load and the extremely small load with the conventional current transformer, and it is highly demanded to further widen the measuring range of the current transformer for metering and realize the current measuring capability with higher accuracy in a larger measuring 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 error compensation technology, and the ratio 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 verification capability of the wide-range current transformer is insufficient. As mentioned above, the current province, city, district and county metering technical institutions at all levels comprise an electric department, a metering center and the current transformer and current proportion standard verification capability of transformer manufacturers can only meet the rated measurement range of 1% -120%. Particularly, when the primary current of the current transformer is less than 1% of the rated current, effective verification means and methods are lacked, and thus the validity of the measurement result of the 0.1% -1% current point in the working state cannot be ensured.
Disclosure of Invention
The application provides error measurement equipment and method of a current transformer, which aim to solve the problem that the ground error of the current transformer is difficult to calibrate.
In order to solve the above-described problems, according to an aspect of the present application, there is provided an error measurement apparatus of a current transformer, the apparatus comprising: the device comprises a detected current transformer, a first standard current transformer, a second standard current transformer and a differential measurement error measuring device; wherein,
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 measurement error measurement device, and the other end of the secondary side winding of the first standard current transformer is connected with a differential measurement current port of the differential measurement error measurement device and one end of the secondary side winding of the second standard current transformer respectively;
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 detected current transformer 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 measurement error measurement 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 detected current transformer through the difference measurement error measurement device to obtain 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/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the rated secondary current value of the current transformer to be detected.
Preferably, the value range of the preset quantity M is 0.1-1.
Preferably, wherein said I 2 The value of (2) is 5A or A.
According to another aspect of the present application, 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 comprising:
calculating transformation ratios of the detected current transformer, the first standard current transformer and the second current transformer according to the preset number of percentage current points;
the configuration of the transformation ratio is carried out according to the transformation ratios of the detected current transformer, the first standard current transformer and the second standard current transformer;
and controlling the current source to output current to percentage current points of a preset quantity, and reading the ratio difference value and the phase difference of the detected current transformer through the difference measurement error measurement device to obtain the error of the detected current transformer under the percentage current points of the preset quantity.
Preferably, the transformation ratio of the first standard current transformer is K/N/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the rated secondary current value of the current transformer to be detected.
Preferably, the value range of the preset quantity M is 0.1-1.
Preferably, wherein said I 2 The value of (2) is 5A or 1A.
The application provides an error measurement device and method of a current transformer, wherein the device comprises: the device comprises a detected current transformer, a first standard current transformer, a second standard current transformer and a differential measurement error measuring device; the current source is controlled to output current to a preset number of percentage current points, and the ratio difference value and the phase difference of the detected current transformer are read through the difference measurement device, so that the error of the detected current transformer under the preset number of percentage current points is obtained; the application can realize the error measurement of 0.1% -1% current points 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 tracing the low-end metering energy value of the wide-range current transformer.
Drawings
Exemplary embodiments of the present application may be more completely understood in consideration of the following drawings:
fig. 1 is a schematic structural view of an error measurement apparatus 100 of a current transformer according to an embodiment of the present application;
fig. 2 is a circuit configuration diagram of an error measurement apparatus of a current transformer according to an embodiment of the present application;
fig. 3 is a flowchart of an error measurement method 300 of a current transformer according to an embodiment of the present application.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application 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 application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms 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 view of an error measurement apparatus 100 of a current transformer according to an embodiment of the present application. As shown in fig. 1, an error measurement apparatus for a current transformer according to an embodiment of the present application includes: the device comprises a detected current transformer, a first standard current transformer, a second standard current transformer and a differential measurement error measuring device; the current source is controlled to output current to a preset number of percentage current points, and the ratio difference value and the phase difference of the detected current transformer are read through the difference measurement device, so that the error of the detected current transformer under the preset number of percentage current points is obtained; the application can realize the error measurement of 0.1% -1% current points 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 tracing the low-end metering energy value of the wide-range current transformer. The error measurement device 100 of the current transformer provided in the embodiment of the application comprises: the device comprises a detected current transformer 101, a first standard current transformer 102, a second standard current transformer 103 and a differential measurement error measurement device 104; wherein, two ends of the primary side winding of the first standard current transformer 102 are respectively connected with a current source and one end of the primary side winding of the detected current transformer 101; one end of a secondary side winding of the first standard current transformer is connected with a standard current port of the differential measurement error measurement device 104, and the other end of the secondary side winding of the first standard current transformer is connected with a differential measurement current port of the differential measurement error measurement device and one end of the secondary side winding of the second standard current transformer respectively; 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 detected current transformer 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 the detected current port of the differential measurement error measurement device.
Preferably, the current source is controlled to output current to a preset number of percentage current points, and the difference value and the phase difference of the detected current transformers are read through the difference measurement error measurement device, so that the error of the detected current transformers under the preset number of percentage current points is obtained.
Preferably, the transformation ratio of the first standard current transformer is K/N/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the rated secondary current value of the current transformer to be detected.
Preferably, the value range of the preset quantity M is 0.1-1.
Preferably, wherein said I 2 The value of (2) is 5A or 1A.
According to the error measurement equipment, the standard current transformer with the transformation ratio of one-N-th tested current transformer is used as the standard device, and the tested current transformer is cascaded with the standard current transformer with the transformation ratio of N times of the lifting transformation ratio, so that the transformation ratios of the tested current transformer and the standard current transformer 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 below 1% in the application is n=1/M, according to the transformation ratio K/I of the current transformer to be tested 2 (wherein I 2 =5a, 1A), selecting the transformation ratio to be K/N/I 2 Standard current transformer CT 01 The secondary non-polar end and the polar end are connected to a standard current port T of a differential error measuring device 0 And differential current port K, standard current transformer CT 01 The primary windings are normally connected in a mode of checking a common current transformer.
CT (computed tomography) of current transformer to be detected X The primary winding is normally connected according to the mode of checking the common current transformer, and the current transformer CT is checked X The secondary cascade transformation ratio is M/I 2 Standard current transformer CT of (1) 02 Primary winding of (a) standard currentMutual inductor CT 02 The secondary nonpolar end and the polar end are connected with a detected current port T of the differential measurement error measuring device X And a differential current port K.
The current source is controlled to output current to an M% current point, and the detected current transformer CT is read through the differential measurement error measuring device X The ratio and the phase difference of the current transformer are obtained to obtain the low-end error of the wide-range current transformer or the wide-range standard current transformer with the M% current point below 1%.
In the present application, taking the calibration m=0.1% current point error of fig. 2 as an example, assume that the transformation ratio of the current transformer to be tested is K/I 2 =100/5, the steps to achieve error measurement include:
first, a transformation ratio coefficient of N=1/0.1=10 is calculated, and then a standard current transformer CT is selected 01 Is K/N/I 2＝ (100/10)/5=10/5, and the secondary non-polar end and the polar end are respectively connected to a standard current port T of the differential error measuring device 0 And differential current port K, standard current transformer CT 01 The 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 CT 02 Wherein the standard current transformer CT 02 The primary winding impedance of the transformer meets the requirement of the secondary load of the current transformer to be detected, and the standard current transformer CT 02 The primary winding is connected with the secondary winding of the current transformer to be detected in a homopolar cascade manner, and the secondary nonpolar end and the polar end of the primary winding are respectively connected with a standard current port T of the differential measurement error measurement device X And a differential current port K.
Finally, controlling the current source to output current to a current point of 0.1%, and reading the current transformer CT to be detected through a differential measurement error measuring device X The ratio difference and the phase difference of the current transformer are obtained, and the error of the current point with the low end of 0.1% of the wide-range current transformer can be obtained, and the error of the current point with the current point of less than 1% can be obtained in the same way.
Fig. 3 is a flowchart of an error measurement method 300 of a current transformer according to an embodiment of the present application. As shown in fig. 3, the error measurement method 300 for a current transformer based on the error measurement device for a current transformer according to the embodiment of the present application starts from step 301, and in step 301, the transformation ratios of the current transformer to be tested, the first standard current transformer and the second current transformer are calculated according to a preset number of percentage current points.
Preferably, the transformation ratio of the first standard current transformer is K/N/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the rated secondary current value of the current transformer to be detected.
Preferably, the value range of the preset quantity M is 0.1-1.
Preferably, wherein said I 2 The value of (2) is 5A or 1A.
In step 302, the transformation ratios of the current transformer to be tested, the first standard current transformer and the second standard current transformer are configured according to the transformation ratios.
In step 303, the current source is controlled to output current to a preset number of percentage current points, and the ratio difference and the phase difference of the current transformers to be detected are read by the differential measurement device, so as to obtain the error of the current transformers to be detected under the preset number of percentage current points.
The error measurement method 300 of the current transformer according to the embodiment of the present application corresponds to the error measurement device 100 of the current transformer according to another embodiment of the present application, and is not described herein.
The application has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed application are equally possible within the scope of the application, as defined by 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 therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, 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.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (6)
1. An error measurement apparatus for a current transformer, the apparatus comprising: the device comprises a detected current transformer, a first standard current transformer, a second standard current transformer and a differential measurement error measuring device; wherein,
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 measurement error measurement device, and the other end of the secondary side winding of the first standard current transformer is connected with a differential measurement current port of the differential measurement error measurement device and one end of the secondary side winding of the second standard current transformer respectively;
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 detected current transformer 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 measurement error measurement device;
the current source is controlled to output current to a preset number of percentage current points, and the ratio difference value and the phase difference of the detected current transformer are read through the difference measurement device, so that the error of the detected current transformer under the preset number of percentage current points is obtained;
wherein the transformation ratio of the first standard current transformer is (K/N)/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the rated secondary current value of the current transformer to be detected.
2. The apparatus according to claim 1, wherein the preset number M has a value ranging from 0.1 to 1.
3. The apparatus of claim 1, wherein the I is 2 The value of (2) is 5A or 1A.
4. A method of measuring an error of a current transformer based on an error measuring apparatus of a current transformer according to any of claims 1-3, characterized in that the method comprises:
calculating transformation ratios of the detected current transformer, the first standard current transformer and the second current transformer according to the preset number of percentage current points;
the configuration of the transformation ratio is carried out according to the transformation ratios of the detected current transformer, the first standard current transformer and the second standard current transformer;
controlling a 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 detected current transformer through the difference measurement device to obtain the error of the detected current transformer under the preset number of percentage current points;
wherein the transformation ratio of the first standard current transformer is (K/N)/I 2 The transformation ratio of the current transformer to be detected is K/I 2 n=1/M, the transformation ratio of the second standard current transformer is M/I 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein M is a preset number; k is the rated primary current value of the current transformer to be detected; i 2 Is the current transformer to be testedRated secondary current value.
5. The method of claim 4, wherein the predetermined number M has a value in the range of 0.1 to 1.
6. The method according to claim 4, wherein the I 2 The value of (2) is 5A or 1A.
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| CN115508766B (en) * | 2022-11-18 | 2023-03-10 | 中国电力科学研究院有限公司 | Error compensation method for standard current transformer and related device |
| 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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