Extension calculation method and system for error of electromagnetic voltage transformer under full load

Abstract

The invention discloses an expansion calculation method and system for an error of an electromagnetic voltage transformer under a full load, and belongs to the technical field of AC voltage testing. The method comprises the following steps: acquiring an error of the electromagnetic voltage transformer under any two loads, and determining an error of the electromagnetic voltage transformer under a full load based on the error under any two loads; calculating the no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under the full load and the relationship between the load error and the no-load error; and based on the no-load error and the distribution rule of the load errors of the electromagnetic voltage transformer under different loads, calculating to obtain an extended actual error of the electromagnetic voltage transformer under the full load. According to the method, the calculation steps are simple, the error under the full load can be obtained through theoretical calculation without carrying out test wiring, and the workload of operation and maintenance personnel is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of AC voltage testing, and more specifically, to an extended calculation method and system for an electromagnetic voltage transformer under full load. Background Art

[0002] In the power system, electromagnetic voltage transformers are used to measure voltages at high voltages to ensure safety and accuracy. The error of electromagnetic voltage transformers consists of no-load error and load error. The no-load error refers to the error between the transformer output and input when there is no load, and the load error refers to the error between the transformer output and input when there is a secondary load. Accurately estimating these errors is crucial to improving the accuracy and stability of power measurement, so studying the corresponding estimation method can help optimize transformer design and application.

[0003] The accuracy level of electromagnetic voltage transformers is closely related to the fairness of measurement trade. When conducting error verification of electromagnetic voltage transformers in the laboratory and on site, error tests under different load values ​​and different power factors are required. Summary of the invention

[0004] In view of the above problems, the present invention proposes an extended calculation method for the error of an electromagnetic voltage transformer under full load, comprising:

[0005] Obtaining errors of the electromagnetic voltage transformer under any two loads, and determining the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads;

[0006] Based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, the no-load error of the electromagnetic voltage transformer is calculated;

[0007] Based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads, the expanded actual error of the electromagnetic voltage transformer under full load is calculated.

[0008] Optionally, the relationship between the load error and the no-load error includes: PT error rules under different loads.

[0009] Optionally, the no-load error of the electromagnetic voltage transformer is calculated based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, including:

[0010] Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

[0011] Optionally, the calibration data includes: coordinates corresponding to the two error points, secondary load and power factor angle.

[0012] Optionally, the calculation formula for calculating the no-load error point is as follows:

[0013]

[0014] R2=(S2 / S1)R1

[0015] Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

[0016] On the other hand, the present invention also provides an extended calculation system for an electromagnetic voltage transformer error under full load, comprising:

[0017] A first calculation unit is used to obtain errors of the electromagnetic voltage transformer under any two loads, and determine the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads;

[0018] A second calculation unit, configured to calculate a no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under full load and a relationship between the load error and the no-load error;

[0019] The third calculation unit is used to calculate the expanded actual error of the electromagnetic voltage transformer under full load based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads.

[0020] Optionally, the relationship between the load error and the no-load error includes: PT error rules under different loads.

[0021] Optionally, the no-load error of the electromagnetic voltage transformer is calculated based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, including:

[0022] Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

[0023] Optionally, the calibration data includes: coordinates corresponding to the two error points, secondary load and power factor angle.

[0024] Optionally, the calculation formula for calculating the no-load error point is as follows:

[0025]

[0026] R2=(S2 / S1)R1

[0027] Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

[0028] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0029] a processor for executing one or more programs;

[0030] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0031] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention provides an extended calculation method for the error of an electromagnetic voltage transformer under full load, comprising: obtaining the error of the electromagnetic voltage transformer under any two loads, and determining the error of the electromagnetic voltage transformer under full load based on the error under two arbitrary loads; calculating the no-load error of the electromagnetic voltage transformer based on the error under full load of the electromagnetic voltage transformer and the relationship between the load error and the no-load error; calculating the extended actual error of the electromagnetic voltage transformer under full load based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads. The calculation steps of the present invention are simple, and the error under full load can be obtained through theoretical calculation without conducting experimental wiring, which greatly reduces the workload of operation and maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flow chart of the method of the present invention;

[0035] Figure 2 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0036] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0037] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0038] Embodiment 1:

[0039] The present invention proposes an extended calculation method for the error of an electromagnetic voltage transformer under full load, such as Figure 1 As shown, including:

[0040] Step 1, obtaining the errors of the electromagnetic voltage transformer under any two loads, and determining the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads;

[0041] Step 2: Based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, calculate the no-load error of the electromagnetic voltage transformer;

[0042] Step 3: Based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads, calculate the expanded actual error of the electromagnetic voltage transformer under full load.

[0043] Among them, the relationship between load error and no-load error includes: the PT error law under different loads.

[0044] Wherein, based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, the no-load error of the electromagnetic voltage transformer is calculated, including:

[0045] Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

[0046] The calibration data include: coordinates corresponding to the two error points, secondary load and power factor angle.

[0047] Among them, the calculation formula for calculating the no-load error point is as follows:

[0048]

[0049] R2=(S2 / S1)R1

[0050] Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

[0051] The present invention is further described below in conjunction with the calculation principle of the present invention:

[0052] The present invention can calculate the error of the electromagnetic voltage transformer under full load through the errors under any two loads;

[0053] Then, it is necessary to calculate the no-load error of the electromagnetic voltage transformer by taking the errors under any two loads and combining the relationship between the load error and the no-load error.

[0054] Finally, based on the no-load error of the electromagnetic voltage transformer and the distribution law of the load error vector under different loads, the actual error of the electromagnetic voltage transformer under full load is calculated.

[0055] Among them, the error vector of electromagnetic voltage transformer can be expressed as:

[0056]

[0057] Among them, S is the secondary load, U2 is the secondary voltage, R1 and R2 are the DC resistance of the primary and secondary windings, X1 and X2 are the leakage inductance of the primary and secondary windings, is the power factor angle.

[0058] Under the same test voltage, the no-load error remains basically constant. Therefore, equation (1) indicates that the voltage transformer error vector can be obtained in the following way:

[0059] According to the PT error law under different loads, the no-load error point can be calculated based on the verification data of two error points (secondary load and power factor are known) under the same test voltage.

[0060] The coordinates of the two known error test points are X1(f1,δ1) and X2(f2,δ2), the corresponding secondary loads are S1 and S2, and the power factor angles are and

[0061] The no-load error point of the electromagnetic voltage transformer is the intersection of circle 1 (center is X1, radius is R1) and circle 2 (center is X2, radius is R2).

[0062]

[0063] The error vector under other loads can be obtained by rotating the known error vector and the no-load error point clockwise. The rotation angle is the power factor angle The proportionality factor is S3 / S 已知 .

[0064] The present invention only needs to know the electromagnetic voltage transformer errors under any two loads to calculate the electromagnetic voltage transformer errors under all different load values ​​and different power factors.

[0065] Embodiment 2:

[0066] The present invention also proposes an extended calculation system 200 for an electromagnetic voltage transformer under full load, such as Figure 2 As shown, including:

[0067] A first calculation unit 201 is used to obtain errors of the electromagnetic voltage transformer under any two loads, and determine the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads;

[0068] A second calculation unit 202, configured to calculate a no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under full load and a relationship between the load error and the no-load error;

[0069] The third calculation unit 203 is used to calculate the extended actual error of the electromagnetic voltage transformer under full load based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads.

[0070] Among them, the relationship between load error and no-load error includes: the PT error law under different loads.

[0071] Wherein, based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, the no-load error of the electromagnetic voltage transformer is calculated, including:

[0072] Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

[0073] The calibration data include: coordinates corresponding to the two error points, secondary load and power factor angle.

[0074] Among them, the calculation formula for calculating the no-load error point is as follows:

[0075]

[0076] R2=(S2 / S1)R1

[0077] Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

[0078] The calculation steps of the present invention are simple, and the error under full load does not need to be tested and wired, but can be obtained through theoretical calculation, which greatly reduces the workload of operation and maintenance personnel.

[0079] Embodiment 3:

[0080] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0081] Embodiment 4:

[0082] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0083] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0084] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0085] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0087] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An extended calculation method for the error of an electromagnetic voltage transformer under full load, characterized in that: include: Obtaining errors of the electromagnetic voltage transformer under any two loads, and determining the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads; Based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error, the no-load error of the electromagnetic voltage transformer is calculated; Based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads, the expanded actual error of the electromagnetic voltage transformer under full load is calculated.

2. The method according to claim 1, characterized in that The relationship between the load error and the no-load error includes: the error law of the electromagnetic voltage transformer PT under different loads.

3. The method according to claim 1, characterized in that The calculating of the no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error includes: Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

4. The method according to claim 3, characterized in that The verification data include: coordinates corresponding to the two error points, secondary load and power factor angle.

5. The method according to claim 3, characterized in that: The calculation formula for calculating the no-load error point is as follows: R2=(S2 / S1)R1 Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

6. An extended calculation system for the error of an electromagnetic voltage transformer under full load, characterized in that: include: A first calculation unit is used to obtain errors of the electromagnetic voltage transformer under any two loads, and determine the error of the electromagnetic voltage transformer under full load based on the errors under the two arbitrary loads; A second calculation unit, configured to calculate a no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under full load and a relationship between the load error and the no-load error; The third calculation unit is used to calculate the expanded actual error of the electromagnetic voltage transformer under full load based on the no-load error and the distribution law of the load error of the electromagnetic voltage transformer under different loads.

7. The system according to claim 6, characterized in that The relationship between the load error and the no-load error includes: PT error rules under different loads.

8. The system according to claim 6, characterized in that The calculating of the no-load error of the electromagnetic voltage transformer based on the error of the electromagnetic voltage transformer under full load and the relationship between the load error and the no-load error includes: Based on the error of the electromagnetic voltage transformer under full load, the error vector of the electromagnetic voltage transformer under any load is determined, and the no-load error point is calculated according to the PT error law under different loads and the calibration data of two error points under the same test voltage. Based on the no-load error point, the no-load error of the electromagnetic voltage transformer is calculated.

9. The system according to claim 8, characterized in that The verification data include: coordinates corresponding to the two error points, secondary load and power factor angle.

10. The system according to claim 8, characterized in that The calculation formula for calculating the no-load error point is as follows: R2=(S2 / S1)R1 Among them, R1 and R2 are two error points, X1, X2, S1, S2, and are the coordinates, secondary load and power factor angle corresponding to the two error points respectively.

11. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 5 is implemented.

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