Method and system for reducing dielectric loss of capacitive voltage divider

Abstract

The invention discloses a method and system for reducing dielectric loss of a capacitive voltage divider, and belongs to the technical field of alternating voltage testing. The method comprises the following steps: determining measurement requirements and environment requirements of broadband measurement and high-precision measurement; adjusting component parameters of an RC network in the capacitive voltage divider based on the measurement requirement and the environment requirement; enabling the component parameters to meet a preset constraint condition so as to reduce the dielectric loss of the capacitive voltage divider; and the RC network is connected in parallel with two ends of a low-voltage capacitor CL in the capacitive voltage divider. The device can be flexibly adjusted according to actual application requirements, and is suitable for different types of capacitive voltage dividers and measurement environments. The implementation mode is simple and the cost is low. The method can be realized by adopting conventional resistor-capacitor elements without special devices, and is convenient for engineering popularization and batch production.

Description

Technical Field

[0001] The present invention relates to the technical field of AC voltage testing, and more particularly to a method and system for reducing dielectric loss of a capacitive voltage divider. Background Art

[0002] The continuous development of power systems has placed higher demands on the accuracy and stability of high-voltage AC voltage measurements. Capacitive voltage dividers, due to their simple structure, excellent insulation performance, and fast response speed, have been widely used in the field of high-voltage measurement. However, existing capacitive voltage dividers generally use a high-voltage capacitor in series with a low-voltage capacitor. The high-voltage capacitors are often air-based, resulting in low dielectric loss; the low-voltage capacitors, on the other hand, are typically ceramic-based, exhibiting high dielectric loss and significantly affected by environmental factors such as temperature and frequency. The dielectric loss of the low-voltage capacitors directly affects the measurement ratio of the entire voltage divider and the phase difference of the output signal, thereby affecting measurement accuracy.

[0003] At present, the common compensation method for the impact of dielectric loss in low-voltage capacitors is mainly to compensate by connecting a single resistor in parallel. However, this method cannot take into account both dielectric loss and frequency response characteristics. The compensation effect is limited, and the parameter selection is restricted, which cannot meet the needs of wide-band and high-precision measurements. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a method for reducing dielectric loss of a capacitive voltage divider, comprising:

[0005] Determine the measurement and environmental requirements for broadband and high-precision measurements;

[0006] Adjusting the component parameters of the RC network in the capacitive voltage divider based on the measurement requirements and environmental requirements;

[0007] The component parameters are made to meet preset constraints to reduce dielectric loss of the capacitive voltage divider;

[0008] The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

[0009] Optionally, in the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2, and Z3, and satisfying the following formula:

[0010]

[0011] Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L, expressed as:

[0012]

[0013] Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

[0014] Optionally, the RC network can be equivalent to a resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is:

[0015]

[0016] Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

[0017] Optional constraints are as follows:

[0018]

[0019] Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

[0020] In another aspect, the present invention provides a system for reducing dielectric loss in a capacitive voltage divider, for:

[0021] Determining measurement requirements and environmental requirements for broadband measurement and high-precision measurement, and adjusting component parameters of an RC network in a capacitive voltage divider based on the measurement requirements and environmental requirements, so that the component parameters meet preset constraints to reduce dielectric loss in the capacitive voltage divider;

[0022] The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

[0023] Optionally, in the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2, and Z3, and satisfying the following formula:

[0024]

[0025] Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L , expressed as:

[0026]

[0027] Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

[0028] Optionally, the RC network can be equivalent to a resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is:

[0029]

[0030] Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

[0031] Optional constraints are as follows:

[0032]

[0033] Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

[0034] In yet another aspect, the present invention further provides a computing device comprising: one or more processors;

[0035] a processor for executing one or more programs;

[0036] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0037] In 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.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention provides a method for reducing dielectric loss of a capacitor voltage divider, comprising: determining measurement requirements and environmental requirements for broadband measurement and high-precision measurement; adjusting component parameters of an RC network in the capacitor voltage divider based on the measurement requirements and environmental requirements; making the component parameters meet preset constraints to reduce dielectric loss of the capacitor voltage divider; connecting the RC network in parallel with a low-voltage capacitor C in the capacitor voltage divider. L The present invention can be flexibly adjusted according to actual application requirements to adapt to different types of capacitive voltage dividers and measurement environments. Its implementation is simple and low-cost. Conventional resistors and capacitors can be used without the need for special components, facilitating engineering promotion and mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a flow chart of the method of the present invention;

[0041] Figure 2 This is the basic principle diagram of the capacitive voltage divider;

[0042] Figure 3 This is the schematic diagram of the RC network. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0044] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that 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.

[0045] Example 1:

[0046] The present invention proposes a method for reducing dielectric loss of a capacitive voltage divider, comprising:

[0047] Determine the measurement and environmental requirements for broadband and high-precision measurements;

[0048] Adjusting the component parameters of the RC network in the capacitive voltage divider based on the measurement requirements and environmental requirements;

[0049] The component parameters are made to meet preset constraints to reduce dielectric loss of the capacitive voltage divider;

[0050] The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

[0051] Optionally, in the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2, and Z3, and satisfying the following formula:

[0052]

[0053] Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L , expressed as:

[0054]

[0055] Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

[0056] Optionally, the RC network can be equivalent to a resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is:

[0057]

[0058] Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

[0059] Optional constraints are as follows:

[0060]

[0061] Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

[0062] Among them, the principle of the capacitor voltage divider is as follows Figure 2 As shown, based on the principle of capacitor voltage divider, the present invention mainly targets the low-voltage capacitor CL and reduces the equivalent dielectric loss of the low-voltage capacitor through circuit design.

[0063] In the method of the present invention, an RC network is used instead of a single resistor connected in parallel at both ends of the low voltage arm capacitor. The schematic diagram of the RC network is as follows: Figure 3 shown.

[0064] In the present invention, the star network formed by resistors R and C1 is equivalently transformed into a triangle network composed of Z1, Z2 and Z3, where:

[0065]

[0066] At this time, Z1 is grounded, and then the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. L The equivalent impedance Z in parallel L It can be expressed as:

[0067]

[0068] The RC network can be equivalent to the resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is:

[0069]

[0070] Where C1+C2=C0.

[0071] Therefore, in order to take into account the low voltage capacitor C L The equivalent dielectric loss and low-frequency response characteristics of the low-voltage unit should meet the following constraints when selecting the parameters of the components in the RC network:

[0072]

[0073] Compared with the prior art, the present invention has the following beneficial effects:

[0074] Traditional capacitive voltage dividers use a high-voltage capacitor and a low-voltage capacitor in series to obtain signal output. The dielectric loss of the low-voltage capacitor directly affects the phase difference of the output signal of the capacitive voltage divider. This patent proposes a method for controlling the dielectric loss of a low-voltage capacitor. By designing an RC circuit in parallel with the low-voltage capacitor, the equivalent dielectric loss of the low-voltage capacitor in parallel is reduced.

[0075] The RC network parameters proposed in this invention can be flexibly adjusted according to actual application requirements, adapting to different types of capacitive voltage dividers and measurement environments. Its implementation is simple and low-cost. Conventional resistors and capacitors can be used, eliminating the need for specialized components, facilitating project deployment and mass production. This technical solution can be widely applied in various applications, including high-voltage testing, metering, and protection, and is of great significance for advancing high-voltage measurement technology in my country's power systems.

[0076] Example 2:

[0077] The present invention provides a system for reducing dielectric loss of a capacitive voltage divider, which is used for:

[0078] Determining measurement requirements and environmental requirements for broadband measurement and high-precision measurement, and adjusting component parameters of an RC network in a capacitive voltage divider based on the measurement requirements and environmental requirements, so that the component parameters meet preset constraints to reduce dielectric loss in the capacitive voltage divider;

[0079] The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

[0080] In the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2 and Z3, and the following formula is satisfied:

[0081]

[0082] Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L , expressed as:

[0083]

[0084] Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

[0085] Among them, the RC network can be equivalent to the resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is:

[0086]

[0087] Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

[0088] The constraints are as follows:

[0089]

[0090] Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

[0091] Example 3:

[0092] 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 may be 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, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method in the above embodiment.

[0093] Example 4:

[0094] 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 can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. 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.

[0095] It will be understood by those skilled in the art that the 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. Furthermore, 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 code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0096] 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 flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 flowcharts and / or block diagrams. 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.

[0097] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0099] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional 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.

[0100] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for reducing dielectric loss of a capacitive voltage divider, characterized in that: include: Determine the measurement and environmental requirements for broadband and high-precision measurements; Adjusting the component parameters of the RC network in the capacitive voltage divider based on the measurement requirements and environmental requirements; The component parameters are made to meet preset constraints to reduce dielectric loss of the capacitive voltage divider; The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

2. The method according to claim 1, characterized in that In the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2 and Z3, and the following formula is satisfied: Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L , expressed as: Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

3. The method according to claim 1, characterized in that The RC network can be equivalent to a resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is: Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

4. The method according to claim 1, wherein The constraints are as follows: Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

5. A system for reducing dielectric loss in a capacitive voltage divider, characterized in that: Used for: Determining measurement requirements and environmental requirements for broadband measurement and high-precision measurement, and adjusting component parameters of an RC network in a capacitive voltage divider based on the measurement requirements and environmental requirements, so that the component parameters meet preset constraints to reduce dielectric loss in the capacitive voltage divider; The RC network is connected in parallel with the low voltage capacitor C in the capacitive voltage divider L Both ends.

6. The system according to claim 5, characterized in that In the RC network, the star network formed by the resistors R and C1 in the RC network is equivalently transformed to be equivalent to a triangle network formed by Z1, Z2 and Z3, and the following formula is satisfied: Among them, Z1 is grounded, and the star network composed of Z2, R and Z3 / / C2 is equivalently transformed. At this time, L The equivalent impedance Z in parallel L , expressed as: Among them, Z1, Z2 and Z3 are the impedances of the equivalent RC network, and Z1 and Z3 are equivalent to the low-voltage capacitor C L The impedance at both ends, Z2 is connected in parallel with C L The impedance on the output, C1 and C2 are the two capacitors in the RC network, ω is the oscillation angular frequency of the output response, X C1 and X C2 are the impedances corresponding to C1 and C2 respectively.

7. The system according to claim 5, characterized in that The RC network can be equivalent to a resistance R(ω)=R(3-R 2 ω 2 C1C2) and inductor L=2R 2 The series connection of (C2+C1) outputs the oscillation angular frequency of the response when testing the low frequency response of the circuit board. The attenuation factor is: Where: C1+C2=C0, L is the inductance connected in parallel to the RC network.

8. The system according to claim 5, wherein: The constraints are as follows: Among them, R N and δ N are the minimum values ​​of dissipation factor and impedance required, respectively.

9. 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 4 is implemented.

10. 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 4 is implemented.

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