CN113156357A

CN113156357A - Segmented current transformer correction method and device, electronic device and storage medium

Info

Publication number: CN113156357A
Application number: CN202011625088.8A
Authority: CN
Inventors: 梁昆; 王观亮; 黄栋; 张轩铭; 钱伟
Original assignee: Hangzhou Tpson Technology Co ltd
Current assignee: Hangzhou Tpson Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-07-23
Anticipated expiration: 2040-12-31
Also published as: CN113156357B

Abstract

The application relates to a sectional type current transformer correction method, wherein the sectional type current transformer correction method comprises the following steps: dividing the measuring points into 50 equal parts according to the measuring range of the current transformer; measuring the current of the measuring point, calculating a theoretical power value of the measuring point, and recording an actual power value of the measuring point; calculating the error percentage of the theoretical value and the actual value of the power according to the theoretical value and the actual value of the power; obtaining a transformer linearity curve according to the error percentage, and dividing the transformer measuring range into three sections through the linearity curve; selecting a calibration point for power calibration on each three-range to obtain a corresponding calibration value; when the current of the measuring point is in one of the three measuring ranges, the current of the measuring point is corrected by using the calibration value of the section. Through the method and the device, the problem that the measurement accuracy of the current transformer is not high in the related technology is solved, and the correction of the sectional type current transformer is realized.

Description

Segmented current transformer correction method and device, electronic device and storage medium

Technical Field

The present disclosure relates to the electrical field, and in particular, to a method and an apparatus for calibrating a segmented current transformer, an electronic apparatus, and a storage medium.

Background

The current transformer is an instrument for converting a large primary side current into a small secondary side current according to the electromagnetic induction principle to measure, and consists of a closed iron core and a winding. In production and operation, the currents in the lines for power generation, power transformation, power transmission, power distribution and power utilization are greatly different, the lines need to be converted into more uniform currents for convenience of measurement, protection and control, and in addition, the voltages on the lines are generally very high, and direct measurement is very dangerous, so that the current transformer has the functions of current transformation and electrical isolation. At present, most current transformers can only reach the 0.5S level when the electric energy measurement accuracy is convenient, the measurement accuracy requirement of higher precision cannot be met, the error between the counted electric energy and the actually consumed electric energy is larger, and the loss is brought to the actual use of users. The reason why higher accuracy is not achieved is often due to poor linearity of the current transformer.

At present, an effective solution is not provided aiming at the problem of low measurement precision of a current transformer in the related technology.

Disclosure of Invention

The embodiment of the application provides a sectional type current transformer correction method, a sectional type current transformer correction device, an electronic device and a storage medium, and aims to at least solve the problem that the measurement accuracy of a current transformer in the related technology is not high.

In a first aspect, an embodiment of the present application provides a method for correcting a segmented current transformer, including:

dividing the measuring points into 50 equal parts according to the measuring range of the current transformer;

measuring the current of the measuring point, calculating a theoretical power value of the measuring point, and recording an actual power value of the measuring point;

calculating the error percentage of the theoretical power value and the actual power value;

obtaining a transformer linearity curve according to the error percentage, and dividing the transformer measuring range into three sections through the linearity curve;

selecting a calibration point for power calibration on each three-range to obtain a corresponding calibration value;

when the current of the measuring point is in one of three measuring ranges, the current of the measuring point is corrected by using the calibration value of the section.

In one embodiment, the power of the measuring point is calculated after measuring the current of the measuring point

The theoretical value and the recording of the actual value of the power of the measurement point comprises:

and respectively outputting the current of each measuring point by using a high-precision standard source, and simultaneously recording the current power of the equipment.

In one embodiment, calculating the error percentage of the theoretical power value and the actual power value according to the theoretical power value and the actual power value comprises:

dividing the difference between the theoretical power value and the actual power value by the actual power value.

In one embodiment, obtaining the transformer linearity curve according to the error percentage includes:

sampling the actual power value of the measuring point for multiple times, and sampling the power of the measuring point for multiple times

Calculating theoretical values to obtain a plurality of error percentages;

and performing curve fitting processing on the error percentages to obtain a transformer linearity curve.

In a second aspect, an embodiment of the present application provides a segmented current transformer calibration apparatus, including:

the halving module is used for dividing the measuring points into 50 equal parts according to the measuring range of the current transformer;

the measuring module is used for measuring the current of the measuring point, then calculating the theoretical power value of the measuring point and recording the actual power value of the measuring point;

the calculation module is used for calculating the error percentage of the theoretical power value and the actual power value;

the curve drawing module is used for obtaining a transformer linearity curve and dividing the transformer measuring range into three sections through the linearity curve;

the calibration module is used for selecting a calibration point for power calibration on each three-range to obtain a corresponding calibration value;

and the correction module is used for correcting the current of the measuring point by using the calibration value of the section when the current of the measuring point is in one section of the three measuring ranges.

In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the processor implements the segmented current transformer calibration method according to the first aspect when executing the computer program.

In a fourth aspect, embodiments of the present application provide a storage medium having a computer program stored therein, where the computer program is configured to execute the segmented current transformer calibration method according to the first aspect when the computer program is executed.

Compared with the related art, the sectional type current transformer correction method provided by the embodiment of the application determines the calibration point and the calibration value by calculating the power error rate and fitting and drawing the graph curve, solves the problem of low measurement precision of the current transformer in the related art, and improves the measurement precision of the current transformer.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a flow chart of a segmented current transformer calibration method according to an embodiment of the present application;

FIG. 2 is a flow chart of a segmented current transformer calibration method according to a first preferred embodiment of the present application;

FIG. 3 is a block diagram of a segmented current transformer calibration apparatus according to an embodiment of the present application;

fig. 4 is a schematic diagram of a hardware structure of a segmented current transformer calibration apparatus according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.

It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as referred to herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.

The embodiment provides a sectional type current transformer correction method. Fig. 1 is a flowchart of a calibration method for a segmented current transformer according to an embodiment of the present application, where the flowchart includes the following steps, as shown in fig. 1:

and step S101, dividing the measuring points into 50 equal parts according to the range of the current transformer.

And step S102, measuring the current of the measuring point, calculating the theoretical power value of the measuring point, and recording the actual power value of the measuring point.

And step S103, calculating the error percentage of the theoretical power value and the actual power value according to the theoretical power value and the actual power value.

And step S104, obtaining a transformer linearity curve according to the error percentage, and dividing the transformer measuring range into three sections through the linearity curve.

And step S105, selecting a calibration point for power calibration on each three-range to obtain a corresponding calibration value.

And step S106, when the current of the measuring point is in one of the three measuring ranges, correcting the current of the measuring point by using the calibration value of the section.

In one embodiment, the step of calculating the theoretical value of the power of the measuring point after measuring the current of the measuring point and recording the actual value of the power of the measuring point comprises the following steps: and respectively outputting the current of each measuring point by using a high-precision standard source, and simultaneously recording the current power of the equipment. In the present embodiment, the high-precision standard source includes a high-precision stable dc current source, a high-precision stable ac current source, and the high-precision stable dc voltage source lamp has a high-precision and high-stability standard source.

In one embodiment, calculating the error percentage of the theoretical power value and the actual power value comprises: the difference between the theoretical power value and the actual power value is divided by the actual power value. In this embodiment, the calculation formula of the power actual value divided by the difference between the power theoretical value and the power actual value is as follows:

wherein Pr is the actual power value, Pd is the theoretical power value, and m is the error percentage.

In the embodiment, the overall accuracy of the equipment is improved by improving the accuracy of the current transformer, and the current transformer is calibrated by a sectional phase calibration method, so that when the measured current is in different ranges, errors are corrected by different calibration parameters, the influence caused by the poor linearity of the transformer is greatly reduced, and the electric energy metering accuracy of the equipment is improved.

Through the steps, the measurement accuracy of the current transformer is improved by calculating the error percentage and drawing the fitting curve.

The embodiment also provides a sectional type current transformer correction method. Fig. 2 is a flowchart of a calibration method for a segmented current transformer according to a preferred embodiment of the present application, and as shown in fig. 2, the flowchart includes the following steps:

step S201, dividing the measuring points into 50 equal parts according to the measuring range of the current transformer.

Step S202, after the current of the measuring point is measured, the power theoretical value of the measuring point is calculated, and the power actual value of the measuring point is recorded.

And step S203, calculating the error percentage of the theoretical power value and the actual power value according to the theoretical power value and the actual power value.

And step S204, sampling the power actual value of the measuring point for multiple times, and calculating the power theoretical value of the measuring point for multiple times to obtain multiple error percentages.

And S205, performing curve fitting processing on the error percentages to obtain a mutual inductor linearity curve.

And step S206, selecting a calibration point for power calibration on each three-range to obtain a corresponding calibration value.

And step S207, when the current of the measuring point is in one of the three measuring ranges, correcting the current of the measuring point by using the calibration value of the section.

Through the steps, the fire-fighting early warning signal is sent to the preset fire-fighting safety responsible personnel after being preprocessed through the AI intelligent voice algorithm, whether fire-fighting safety information is misjudged through intelligent voice conversation information of the preset fire-fighting safety responsible personnel, whether a fire-fighting safety emergency plan is started is judged according to the voice information of the preset fire-fighting safety responsible personnel, manual investigation is replaced by the computer intelligent algorithm, the cost is saved, and the consumption of human resources is reduced.

The embodiments of the present application are described and illustrated below by means of preferred embodiments.

The present embodiment further provides a calibration apparatus for a sectional type current transformer, which is used to implement the foregoing embodiments and preferred embodiments, and the description of the calibration apparatus is omitted. As used hereinafter, the terms "module," "unit," "subunit," and the like may implement a combination of software and/or hardware for a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 4 is a block diagram of a segmented current transformer calibration apparatus according to an embodiment of the present application, and as shown in fig. 4, the apparatus includes: the halving module 31 is used for dividing the measuring points into 50 equal parts according to the measuring range of the current transformer; the measuring module 32 is coupled to the halving module 31 and used for calculating a theoretical power value of the measuring point after measuring the current of the measuring point and recording an actual power value of the measuring point; a calculating module 33, coupled to the measuring module 32, for calculating the error percentage of the theoretical power value and the actual power value; the curve drawing module 34 is coupled to the calculating module 33 and is used for obtaining a transformer linearity curve and dividing the transformer range into three sections through the linearity curve; the calibration module 35 is coupled to the curve drawing module 34, and is configured to select a calibration point for power calibration on each of the three ranges to obtain a corresponding calibration value; and the correction module 36 is coupled to the calibration module 35 and is used for correcting the current of the measuring point by using the calibration value of the segment when the current of the measuring point is in one segment of the three-segment measuring range.

The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.

In addition, the segmented current transformer correction method described in connection with fig. 1 in the embodiment of the present application may be implemented by a segmented current transformer correction apparatus. Fig. 4 is a schematic diagram of a hardware structure of a segmented current transformer calibration apparatus according to an embodiment of the present application.

The segmented current transformer calibration apparatus may include a processor 41 and a memory 42 having stored computer program instructions.

Specifically, the processor 41 may include a Central Processing Unit (CPU), or A Specific Integrated Circuit (ASIC), or may be configured to implement one or more Integrated circuits of the embodiments of the present Application.

Memory 44 may include, among other things, mass storage for data or instructions. By way of example, and not limitation, memory 44 may include a Hard Disk Drive (Hard Disk Drive, abbreviated to HDD), a floppy Disk Drive, a Solid State Drive (SSD), flash memory, an optical Disk, a magneto-optical Disk, tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 44 may include removable or non-removable (or fixed) media, where appropriate. The memory 44 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 44 is a Non-Volatile (Non-Volatile) memory. In particular embodiments, Memory 44 includes Read-Only Memory (ROM) and Random Access Memory (RAM). The ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), Electrically rewritable ROM (EAROM), or FLASH Memory (FLASH), or a combination of two or more of these, where appropriate. The RAM may be a Static Random-Access Memory (SRAM) or a Dynamic Random-Access Memory (DRAM), where the DRAM may be a Fast Page Mode Dynamic Random-Access Memory (FPMDRAM), an Extended data output Dynamic Random-Access Memory (EDODRAM), a Synchronous Dynamic Random-Access Memory (SDRAM), and the like.

Memory 44 may be used to store or cache various data files for processing and/or communication use, as well as possibly computer program instructions for execution by processor 42.

The processor 41 reads and executes computer program instructions stored in the memory 42 to implement any one of the segmented current transformer calibration methods in the above-described embodiments.

In some of these embodiments, the segmented current transformer calibration apparatus may further comprise a communication interface 43 and a bus 40. As shown in fig. 4, the processor 41, the memory 42, and the communication interface 43 are connected via the bus 40 to complete mutual communication.

The communication interface 43 is used for implementing communication between modules, devices, units and/or apparatuses in the embodiments of the present application. The communication interface 43 may also be implemented with other components such as: the data communication is carried out among external equipment, image/data acquisition equipment, a database, external storage, an image/data processing workstation and the like.

The bus 40 includes hardware, software, or both that couple the components of the segmented current transformer calibration apparatus to one another. Bus 40 includes, but is not limited to, at least one of the following: data Bus (Data Bus), Address Bus (Address Bus), Control Bus (Control Bus), Expansion Bus (Expansion Bus), and Local Bus (Local Bus). By way of example, and not limitation, Bus 40 may include an Accelerated Graphics Port (AGP) or other Graphics Bus, an Enhanced Industry Standard Architecture (EISA) Bus, a Front-Side Bus (FSB), a Hyper Transport (HT) Interconnect, an ISA (ISA) Bus, an InfiniBand (InfiniBand) Interconnect, a Low Pin Count (LPC) Bus, a memory Bus, a microchannel Architecture (MCA) Bus, a PCI (Peripheral Component Interconnect) Bus, a PCI-Express (PCI-X) Bus, a Serial Advanced Technology Attachment (SATA) Bus, a Video Electronics Bus (audio Electronics Association), abbreviated VLB) bus or other suitable bus or a combination of two or more of these. Bus 40 may include one or more buses, where appropriate. Although specific buses are described and shown in the embodiments of the application, any suitable buses or interconnects are contemplated by the application.

The sectional type current transformer correction device can execute the sectional type current transformer correction method in the embodiment of the application based on the acquired sectional type current transformer correction, so that the sectional type current transformer correction method described in connection with fig. 1 is realized.

In addition, in combination with the segmented current transformer calibration method in the above embodiments, the embodiments of the present application may be implemented by providing a computer readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the segmented current transformer calibration methods of the above embodiments.

Compared with the prior art, the method has the following advantages:

1. according to the method, the calibration point and the calibration value are determined by fitting the error curve by using a sectional phase calibration method, so that the measurement accuracy of the current transformer is improved.

2. When the measuring current is in different ranges, the error is corrected by different calibration parameters, and the method has wide applicability to currents with different sizes.

3. According to the method, the measurement accuracy of the current transformer is improved through a software level method of measurement fitting, the current transformer does not need to be greatly modified in a hardware level, and the technical application cost is saved.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A sectional type current transformer correction method is characterized by comprising the following steps:

2. The segmented current transformer calibration method according to claim 1, wherein the calculating a theoretical power value of the measurement point after measuring the current of the measurement point and recording an actual power value of the measurement point comprises:

3. The segmented current transformer calibration method according to claim 1, wherein calculating the error percentage of the theoretical power value and the actual power value comprises:

4. The segmented current transformer calibration method of claim 1, wherein obtaining a transformer linearity curve based on the error percentage comprises:

sampling the power actual value of the measuring point for multiple times, and calculating the power theoretical value of the measuring point for multiple times to obtain multiple error percentages;

5. A sectional type current transformer correcting unit, its characterized in that includes:

6. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and the processor is configured to execute the computer program to perform the segmented current transformer calibration method of any one of claims 1 to 4.

7. A storage medium having a computer program stored thereon, wherein the computer program is configured to perform the segmented current transformer calibration method of any one of claims 1 to 4 when executed.