CN115508766A - Error compensation method and related device for standard current transformer - Google Patents
Error compensation method and related device for standard current transformer Download PDFInfo
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- CN115508766A CN115508766A CN202211459045.6A CN202211459045A CN115508766A CN 115508766 A CN115508766 A CN 115508766A CN 202211459045 A CN202211459045 A CN 202211459045A CN 115508766 A CN115508766 A CN 115508766A
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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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- 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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The invention discloses a standard current transformer error compensation method and a related device. The method comprises the following steps: sequentially injecting a plurality of primary currents into a standard current transformer to be compensated, and calculating a plurality of errors under the plurality of primary currents, wherein the plurality of primary currents are preset rated currents with different percentages, and the standard current transformer to be compensated consists of a main standard device and an error compensation device; calculating a plurality of sub-optimal transformation ratios of the error compensation device under a plurality of primary currents according to the plurality of errors; calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios; and comparing the plurality of theoretical comprehensive errors and the plurality of errors to determine the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
Description
Technical Field
The present invention relates to the field of transformer calibration technologies, and in particular, to an error compensation method for a standard current transformer and a related apparatus.
Background
The current transformer is one of key devices in an electric power system, can convert a large current signal in a primary system of a power grid into a standard small current signal (1A or 5A) with high accuracy according to a specified proportion, and is used for a subsequent secondary metering, measuring and protecting system.
The wide-range current transformer is used as a measuring instrument related to trade settlement, and the country has clear verification requirements. However, the measurement ranges of the related measurement standard devices of the existing current transformer are (1% -120%) rated current, and the calibration requirements of the wide-range current transformer are not met. The wide-range standard current transformer is a core calibrating device of the wide-range current transformer, is used for providing standard transmission quantity values, and can be traced to the highest national standard. The calibration of the wide-range current transformer requires at least two levels of standard current transformers higher than the accuracy level of the wide-range current transformer.
The existing wide-range current transformer generally adopts a novel high-magnetic-performance iron core to realize the expansion of the range and the improvement of the accuracy, but the improvement of the performance also has certain limit, the development of the wide-range standard current transformer by adopting the same principle is difficult to be extremely large, and the expected precision and the working range can not be reached.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an error compensation method and a related device for a standard current transformer.
According to one aspect of the invention, a standard current transformer error compensation method is provided, which comprises the following steps:
sequentially injecting a plurality of primary currents into a standard current transformer to be compensated, and calculating a plurality of errors under the plurality of primary currents, wherein the plurality of primary currents are preset rated currents with different percentages, and the standard current transformer to be compensated consists of a main standard device and an error compensation device;
calculating a plurality of sub-optimal transformation ratios of the error compensation device under a plurality of primary currents according to the plurality of errors;
calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios;
and comparing the plurality of theoretical comprehensive errors and the plurality of errors to determine the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
Optionally, the plurality of different percentages are respectively: 0.5%, 1%, 5%, 20%, 100%, 120%, 150%, 200%.
Optionally, the operation of calculating a plurality of sub-optimal transformation ratios of the error compensation apparatus at a plurality of primary currents according to the plurality of errors respectively comprises:
calculating a plurality of sub-optimal transformation ratios according to the number of turns of a primary winding, the number of turns of a secondary winding and a plurality of errors of the standard current transformer to be compensated, wherein the calculation formula is as follows:
B
1i
/ B
2i
=e
1i
N
1
/N
2
wherein the content of the first and second substances,ifor a plurality of primary currents of different percent current ratings,B 1i / B 2i the ratio of the number of turns of the primary winding and the secondary winding of the error compensation device,e 1i in order to be an error, the error is,N 1 /N 2 the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the standard current transformer to be compensated is obtained.
Optionally, the operation of calculating a plurality of theoretical composite errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios includes:
measuring a plurality of secondary currents generated by a standard current transformer to be compensated under a plurality of primary currents;
and calculating a plurality of theoretical comprehensive errors according to the plurality of primary currents, the plurality of secondary currents and the plurality of sub-optimal transformation ratios.
Optionally, the operation of comparing the plurality of theoretical combined errors and the plurality of errors to determine the optimal transformation ratio of the error compensation device comprises:
comparing the plurality of theoretical composite errors with the plurality of errors to determine a plurality of difference values;
and learning the plurality of difference values through a deep belief network algorithm to determine the optimal transformation ratio of the error compensation device.
According to another aspect of the present invention, there is provided a standard current transformer error compensation apparatus, comprising:
the first calculation module is used for sequentially injecting a plurality of primary currents into the standard current transformer to be compensated and calculating a plurality of errors under the plurality of primary currents, wherein the plurality of primary currents are preset rated currents with different percentages, and the standard current transformer to be compensated consists of a main standard device and an error compensation device;
the second calculation module is used for calculating a plurality of sub-optimal transformation ratios of the error compensation device under a plurality of primary currents according to a plurality of errors;
the third calculation module is used for calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios;
and the determining module is used for comparing the plurality of theoretical comprehensive errors and the plurality of errors and determining the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
According to a further aspect of the present invention there is provided a computer readable storage medium having stored thereon a computer program for performing the method of any of the above aspects of the present invention.
According to still another aspect of the present invention, there is provided an electronic apparatus including: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of the above aspects of the present invention.
Therefore, the optimal transformation ratio of the compensation device under each current point and the theoretical comprehensive error corresponding to each current point are obtained through measurement and calculation of the checking system, the optimal transformation ratio of the compensation device is determined through a deep belief network algorithm, the compensation mode is single, manual repeated calculation and test are not needed, the design difficulty of the standard current transformer is greatly reduced, and the design workload is reduced.
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 flow chart diagram of a standard current transformer error compensation method provided by an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a standard current transformer arrangement provided in accordance with an exemplary embodiment of the present invention;
fig. 3 is a schematic structural diagram of a standard current transformer error compensation apparatus according to an exemplary embodiment of the present invention;
fig. 4 is a structure of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, example embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments of the present invention, and it should be understood that the present invention is not limited by the exemplary embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
It will be understood by those of skill in the art that the terms "first," "second," and the like in the embodiments of the present invention are used merely to distinguish one element, step, device, module, or the like from another element, and do not denote any particular technical or logical order therebetween.
It should also be understood that in embodiments of the present invention, "a plurality" may refer to two or more than two, and "at least one" may refer to one, two or more than two.
It is also to be understood that any reference to any component, data, or structure in the embodiments of the invention may be generally understood as one or more, unless explicitly defined otherwise or stated to the contrary hereinafter.
In addition, the term "and/or" in the present invention is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the present invention, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
It should also be understood that the description of the embodiments of the present invention emphasizes the differences between the embodiments, and the same or similar parts may be referred to each other, and are not repeated herein for brevity.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations, and with numerous other electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with electronic devices, such as terminal devices, computer systems, servers, and the like, include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, networked personal computers, minicomputer systems, mainframe computer systems, distributed cloud computing environments that include any of the above, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc. that perform particular tasks or implement particular abstract data types. The computer system/server may be practiced in distributed cloud computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computer system storage media including memory storage devices.
Exemplary method
Fig. 1 is a schematic flowchart of a method for compensating an error of a standard current transformer according to an exemplary embodiment of the present invention. The embodiment can be applied to an electronic device, and as shown in fig. 1, the method 100 for compensating the error of the standard current transformer includes the following steps:
Optionally, the plurality of different percentages are respectively: 0.5%, 1%, 5%, 20%, 100%, 120%, 150%, 200%.
And 102, respectively calculating a plurality of sub-optimal transformation ratios of the error compensation device under a plurality of primary currents according to the plurality of errors.
Optionally, the operation of calculating a plurality of sub-optimal transformation ratios of the error compensation apparatus at a plurality of primary currents according to the plurality of errors respectively comprises:
calculating a plurality of sub-optimal transformation ratios according to the number of turns of a primary winding, the number of turns of a secondary winding and a plurality of errors of the standard current transformer to be compensated, wherein the calculation formula is as follows:
B
1i
/ B
2i
=e
1i
N
1
/N
2
wherein the content of the first and second substances,ifor a plurality of primary currents of different percent current ratings,B 1i / B 2i the ratio of the number of turns of the primary winding and the secondary winding of the error compensation device,e 1i in order to be an error in the measurement,N 1 /N 2 the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the standard current transformer to be compensated.
And 103, calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios.
Optionally, the operation of calculating a plurality of theoretical composite errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios includes:
measuring a plurality of secondary currents generated by the standard current transformer to be compensated under a plurality of primary currents;
and calculating a plurality of theoretical comprehensive errors according to the plurality of primary currents, the plurality of secondary currents and the plurality of sub-optimal transformation ratios.
And 104, comparing the plurality of theoretical comprehensive errors and the plurality of errors, and determining the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
Optionally, the operation of comparing the plurality of theoretical combined errors and the plurality of errors to determine the optimal transformation ratio of the error compensation device comprises:
comparing the plurality of theoretical comprehensive errors with the plurality of errors to determine a plurality of difference values;
and learning the plurality of difference values through a deep belief network algorithm to determine the optimal transformation ratio of the error compensation device.
Specifically, referring to fig. 2, a standard current transformer CT3 generally includes a primary winding, a secondary winding, an iron core, and a standard current transformer error compensation device CT 2 (ii) a Main standard device CT formed by primary winding, secondary winding and iron core 1 . Wherein P is 1 -P 2 After compensation, the primary winding terminal of the whole wide-range standard current transformer CT3, S 1 -S 2 Is the secondary winding terminal, I, of the whole wide-range standard current transformer CT3 after compensation B2 Is the compensation current.
Error compensation device CT of standard current transformer 2 CT (computed tomography) for supplementary measurement of to-be-compensated main standard device 1 The error of (2). CT (computed tomography) of main standard device to be compensated 1 Has a primary winding of turnsN 1 The number of turns of the secondary winding isN2Let measurement CT 1 Primary current of I 1 The secondary current is I 2 . Error compensation device CT of standard current transformer 2 Including primary and secondary windings. Having a primary winding with a number of turns ofB 1 The number of turns of the secondary winding isB 2 。
Error compensation device CT of standard current transformer 2 The determination step of the optimal transformation ratio is as follows:
the method comprises the following steps: CT (computed tomography) measuring to-be-compensated main standard device 1 (hereinafter abbreviated as CT) 1 ) Primary winding and number of turns of secondary windingN 1 AndN 2 and measuring CT 1 Primary current ofI 1i A secondary current ofI 2i In whichi=0，1，2，3，4，5，6，7，8，I 11 -I 18 Respectively taking 0.5 percentI n 、1% I n 、5% I n 、20% I n 、100% I n 、120% I n 、150% I n 、200% I n Is prepared fromI n The rated current.
Step two: at 0.1% of the rated current, i.e.I 11 And calculating the theoretical exciting current of the current transformer to be measuredI 01 = e 11 I 1 Measuring the CT of the main standard device to be compensated 1 Error of (2)e 11 。
Step three: and calculating the error compensation device CT of the standard current transformer at the current point 2 Is optimized toB 11 / B 21 =e 11 N 1 /N 2 。
For example, supposeN 1 /N 2 =1/200, rated primary currentI 1 Rated secondary current of 1000AI 2 Is 5A;
according to the formulaI 1 N 1 +I 0 N 1 = I 2 N 2 1000X 1+ can be obtained by calculationI 0 *1=200 × 4.99, thenI 0 =1000-998=2A；
According to the formulaI 0 =e 11 I 1 Computed to obtain CT 1 Error of (2)e 11 =2/1000=0.2%；
If the required error is 0, then a current of 0.01A is added for the second time, namely 1000A current passes through CT 2 When the current transformer is converted into 0.01A, the error compensation device CT of the current transformer 2 Is optimized toB 1 /B 2 The following: 1000/0.01=B 2 /B 1 ；
Namely CT 2 Optimum transformation ratioB 1 /B 2 Under the condition that the standard current transformer CT1 to be compensated is cascaded with the current transformer error compensation device CT2, the error of the CT1 at the 0.1 in-200 in-line current point can meet the requirement of the error limit value, and the error value is optimal.
Step four: calculating theoretical comprehensive error under 0.1% rated current pointe 21 = (N 2 (I 2 +e 11 I 1 N 1 /N 2 )- I 1 N 1 )/I 1 N 1 。
Step five: in thatI 1i Is 0.5 percentI n 、1% I n 、5% I n 、20% I n 、100% I n 、120% I n 、150% I n 、200% I n Measuring the error of the main standard device CT1 to be compensatede 12 、e 13 、e 14 、e 15 、e 16 、e 17 、e 18 (ii) a Recording the primary currentI 11 、I 12 、I 13 、I 14 、I 15 、I 16 、I 17 、I 18 And secondary currentI 21 、I 22 、I 23 、I 24 、I 25 、I 26 、I 27 、I 28 。
Step six: calculating to obtain the optimal transformation ratio of the standard current transformer error compensation device CT2 at each current point,B 12 /B 22 =e 12 N 1 /N 2 ，B 13 /B 23 =e 13 N 1 /N 2 ，B 14 /B 24 =e 14 N 1 /N 2 ，B 15 /B 25 =e 15 N 1 /N 2 ，B 16 /B 26 =e 16 N 1 /N 2 ，B 17 /B 27 =e 17 N 1 /N 2 ，B 18 /B 28 =e 18 N 1 /N 2 。
step seven: and comparing the theoretical comprehensive errors at different current points corresponding to the optimal transformation ratios with the error limit value, and calculating the difference value. The basic error limit of the wide-range standard current transformer is shown in table 1:
TABLE 1
Step eight: the error compensation device CT of the standard current transformer is determined by learning the difference result through a deep belief network algorithm 2 The optimal transformation ratio of the main standard device CT1 to be compensated is enabled to be in cascade connection with the error compensation device CT of the standard current transformer 2 Then, at (0.1%I n -200%I n ) The error under each current point meets the requirement of table 1, and the error value is optimal.
Compared with the prior art, the invention has the beneficial effects that:
(1) The intelligent degree of precision adjustment is high, the design is high-efficient: the optimal transformation ratio of the compensation device under each current point and the theoretical comprehensive error corresponding to each current point are obtained through measurement and calculation of the verification system, the optimal transformation ratio of the compensation device is determined through a deep belief network algorithm, the compensation mode is single, manual repeated calculation and test are not needed, the design difficulty of the standard current transformer is greatly reduced, and the design workload is reduced.
(2) The precision is adjusted simply, and the process is saved: the optimal transformation ratio of the compensation device is determined from the multiple sub-optimal transformation ratios through a deep belief network algorithm, and then the adjustment compensation device is adjusted to the corresponding transformation ratio, so that the design of the wide-range standard current transformer can be realized, and measures such as fractional turn compensation, short circuit turn compensation, magnetic shunt compensation and/or capacitance and inductance compensation are not required to be applied in combination with repeated test comparison error data.
(3) Adjust accurately, equipment uniformity is high: the patent can determine 0.5 percent through a machine learning modeI n 、1% I n 、5% I n 、20% I n 、100% I n 、120% I n 、150% I n 、200% I n The optimal transformation ratio of the compensation device with the comprehensive errors meeting the error limit value requirement specified by the regulations is not required to be calculated manually and tested repeatedly, the uncertainty caused by the level difference of the adjustment personnel is reduced, and the precision of the wide-range standard current transformer and the consistency of equipment are improved. The accuracy of the wide-range standard current transformer and the wide-range current transformer can be guaranteed, the fairness and the justness of electric energy metering are guaranteed, and meanwhile the design and production difficulty of the wide-range standard current transformer and the wide-range current transformer can be reduced.
(4) The application range is wide: the standard current transformer error compensation method based on the deep belief network can be applied to the design of current transformers such as wide-range standard current transformers, wide-range current transformers and current transformers for metering, and is wide in application range.
(5) The working range of the standard current transformer/current transformer for metering is widened, and the development of the electric energy metering industry is facilitated.
Exemplary devices
Fig. 3 is a schematic structural diagram of a standard current transformer error compensation apparatus according to an exemplary embodiment of the present invention. As shown in fig. 3, the apparatus 300 includes:
the first calculating module 310 is configured to sequentially inject a plurality of primary currents into a standard current transformer to be compensated, and calculate a plurality of errors under the plurality of primary currents, where the plurality of primary currents are preset currents with different percentage ratings, and the standard current transformer to be compensated is composed of a main standard device and an error compensating device;
a second calculating module 320, configured to calculate a plurality of sub-optimal transformation ratios of the error compensation apparatus at a plurality of primary currents according to the plurality of errors;
the third calculating module 330 is configured to calculate a plurality of theoretical composite errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios;
and the determining module 340 is used for comparing the plurality of theoretical comprehensive errors and the plurality of errors and determining the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
Optionally, the plurality of different percentages are respectively: 0.5%, 1%, 5%, 20%, 100%, 120%, 150%, 200%.
Optionally, the second calculating module 320 includes:
the first calculation submodule is used for calculating a plurality of sub-optimal transformation ratios according to the number of turns of a primary winding, the number of turns of a secondary winding and a plurality of errors of the standard current transformer to be compensated, wherein the calculation formula is as follows:
B
1i
/ B
2i
=e
1i
N
1
/N
2
wherein the content of the first and second substances,ia plurality of primary currents of different percent current ratings,B 1i / B 2i the ratio of the number of turns of the primary winding and the secondary winding of the error compensation device,e 1i in order to be an error, the error is,N 1 /N 2 the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the standard current transformer to be compensated.
Optionally, the third calculating module 330 includes:
the measurement submodule is used for measuring a plurality of secondary currents generated by the standard current transformer to be compensated under a plurality of primary currents;
and the second calculation submodule is used for calculating a plurality of theoretical comprehensive errors according to the plurality of primary currents, the plurality of secondary currents and the plurality of sub-optimal transformation ratios.
Optionally, the determining module 340 includes:
a first determining submodule for comparing the plurality of theoretical composite errors with the plurality of errors and determining a plurality of difference values;
and the second determining submodule is used for learning the plurality of difference values through a deep belief network algorithm and determining the optimal transformation ratio of the error compensation device.
Exemplary electronic device
Fig. 4 is a structure of an electronic device according to an exemplary embodiment of the present invention. As shown in fig. 4, electronic device 40 includes one or more processors 41 and memory 42.
The processor 41 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.
The input device 43 may also include, for example, a keyboard, a mouse, and the like.
The output device 44 can output various information to the outside. The output devices 44 may include, for example, a display, speakers, a printer, and a communication network and its connected remote output devices, among others.
Of course, for simplicity, only some of the components of the electronic device that are relevant to the present invention are shown in fig. 4, omitting components such as buses, input/output interfaces, and the like. In addition, the electronic device may include any other suitable components, depending on the particular application.
Exemplary computer program product and computer-readable storage Medium
In addition to the above-described methods and apparatus, embodiments of the invention may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the invention described in the "exemplary methods" section above of this specification.
The computer program product may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages, for carrying out operations according to embodiments of the present invention. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present invention may also be a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps in the method of information mining of historical change records according to various embodiments of the present invention described in the "exemplary methods" section above of this specification.
The computer readable storage medium may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The basic principles of the present invention have been described above with reference to specific embodiments, but it should be noted that the advantages, effects, etc. mentioned in the present invention are only examples and are not limiting, and the advantages, effects, etc. must not be considered to be possessed by various embodiments of the present invention. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the invention is not limited to the specific details described above.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The block diagrams of devices, systems, apparatuses, systems involved in the present invention are by way of illustrative examples only and are not intended to require or imply that the devices, systems, apparatuses, systems, and systems must be connected, arranged, or configured in the manner shown in the block diagrams. These devices, systems, apparatuses, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
It should also be noted that in the systems, apparatus and methods of the present invention, individual components or steps may be broken down and/or re-combined. These decompositions and/or recombinations are to be considered as equivalents of the present invention. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the invention to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A method for compensating error of a standard current transformer is characterized by comprising the following steps:
sequentially injecting a plurality of primary currents into a standard current transformer to be compensated, and calculating a plurality of errors under the plurality of primary currents, wherein the plurality of primary currents are preset rated currents with different percentages, and the standard current transformer to be compensated consists of a main standard device and an error compensation device;
calculating a plurality of sub-optimal transformation ratios of the error compensation device under the plurality of primary currents according to the plurality of errors respectively;
calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios;
and comparing the plurality of theoretical comprehensive errors with the plurality of errors, and determining the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
2. The method of claim 1, wherein the plurality of different percentages are respectively: 0.5%, 1%, 5%, 20%, 100%, 120%, 150%, 200%.
3. The method of claim 1, wherein the operation of calculating a plurality of sub-optimal transformation ratios of the error compensation device at the plurality of primary currents from the plurality of errors, respectively, comprises:
and calculating the plurality of sub-optimal transformation ratios according to the number of turns of the primary winding, the number of turns of the secondary winding and the plurality of errors of the standard current transformer to be compensated, wherein the calculation formula is as follows:
B
1i
/ B
2i
=e
1i
N
1
/N
2
wherein the content of the first and second substances,ifor a plurality of primary currents of different percent current ratings,B 1i / B 2i the ratio of the number of turns of the primary winding and the secondary winding of the error compensation device,e 1i in order to be an error, the error is,N 1 /N 2 and the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the standard current transformer to be compensated is obtained.
4. The method of claim 1, wherein the operation of calculating a plurality of theoretical composite errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios comprises:
measuring a plurality of secondary currents generated by the standard current transformer to be compensated under the plurality of primary currents;
and calculating the plurality of theoretical comprehensive errors according to the plurality of primary currents, the plurality of secondary currents and the plurality of sub-optimal transformation ratios.
5. The method of claim 1, wherein the act of comparing the plurality of theoretical combined errors to the plurality of errors to determine an optimal transformation ratio for the error compensation device comprises:
comparing the plurality of theoretical composite errors with the plurality of errors to determine a plurality of difference values;
and learning the plurality of difference values through a deep belief network algorithm to determine the optimal transformation ratio of the error compensation device.
6. A standard current transformer error compensation apparatus, comprising:
the first calculation module is used for sequentially injecting a plurality of primary currents into the standard current transformer to be compensated and calculating a plurality of errors under the plurality of primary currents, wherein the plurality of primary currents are preset rated currents with different percentages, and the standard current transformer to be compensated consists of a main standard device and an error compensation device;
a second calculating module, configured to calculate a plurality of sub-optimal transformation ratios of the error compensating apparatus at the plurality of primary currents according to the plurality of errors, respectively;
the third calculation module is used for calculating a plurality of theoretical comprehensive errors of the standard current transformer to be compensated according to the plurality of sub-optimal transformation ratios;
and the determining module is used for comparing the plurality of theoretical comprehensive errors with the plurality of errors and determining the optimal transformation ratio of the error compensation device, wherein the optimal transformation ratio is used for realizing the error compensation of the standard current transformer to be compensated.
7. The apparatus of claim 6, wherein the plurality of different percentages are respectively: 0.5%, 1%, 5%, 20%, 100%, 120%, 150%, 200%.
8. The apparatus of claim 6, wherein the second computing module comprises:
the first calculation submodule is used for calculating the sub-optimal transformation ratios according to the number of turns of the primary winding, the number of turns of the secondary winding and the errors of the standard current transformer to be compensated, wherein a calculation formula is as follows:
B
1i
/ B
2i
=e
1i
N
1
/N
2
wherein the content of the first and second substances,ifor a plurality of primary currents of different percent current ratings,B 1i / B 2i the ratio of the number of turns of the primary winding and the secondary winding of the error compensation device,e 1i in order to be an error in the measurement,N 1 /N 2 and the ratio of the number of turns of the primary winding to the number of turns of the secondary winding of the standard current transformer to be compensated is obtained.
9. A computer-readable storage medium, characterized in that the storage medium stores a computer program for performing the method of any of the preceding claims 1-5.
10. An electronic device, characterized in that the electronic device comprises:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any one of claims 1-5.
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