阅读说明：本技术 一种阻容分压器阻容参数测量方法及装置 (Resistance-capacitance parameter measuring method and device for resistance-capacitance voltage divider ) 是由 罗奕 陈伟松 肖勇 郭斌 钱斌 许丽娟 李富盛 冯兴兴 张帆 孙颖 于 2021-08-19 设计创作，主要内容包括：本申请提供了一种阻容分压器阻容参数测量方法及装置,本申请提供的方法基于待测量的阻容分压器,通过频率响应测试方式,分别测量出该阻容分压器在不同状态下的分压比比差和分压比角差,再基于测量出的分压比比差和分压比角差,结合阻容分压器的分压比传递函数以及预设的阻容参数求解算法进行求解计算,无需将阻容分压器拆解即可得到该阻容分压器的阻容参数,解决了现有的阻容式分压器测量技术存在测量繁琐的技术问题。(The method comprises the steps of respectively measuring a voltage division ratio difference and a voltage division ratio angle difference of the resistance-capacitance voltage divider in different states through a frequency response test mode based on the resistance-capacitance voltage divider to be measured, combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm to carry out solving calculation based on the measured voltage division ratio difference and voltage division ratio angle difference, obtaining resistance-capacitance parameters of the resistance-capacitance voltage divider without disassembling the resistance-capacitance voltage divider, and solving the technical problem that the existing resistance-capacitance voltage divider measurement technology has complex measurement.)

1. A method for measuring resistance-capacitance parameters of a resistance-capacitance voltage divider is characterized by comprising the following steps:

measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response test mode based on the resistance-capacitance voltage divider to be measured;

measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through the frequency response test mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and the state is when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel;

and performing solving calculation by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference so as to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

2. The method as claimed in claim 1, wherein when the second voltage division ratio difference and the second voltage division ratio angle difference are multiple sets of parameters obtained by connecting the nominal capacitance in parallel for multiple times, the resistance-capacitance parameter solution algorithm is specifically a resistance-capacitance parameter optimization solution algorithm, and if not, the resistance-capacitance parameter solution algorithm is specifically a resistance-capacitance parameter iteration solution algorithm.

3. The method for measuring the resistance-capacitance parameter of the resistance-capacitance voltage divider according to claim 2, wherein the iterative solution algorithm for the resistance-capacitance parameter specifically comprises: newton's algorithm, confidence domain algorithm, or heuristic algorithm.

4. The method for measuring the resistance-capacitance parameters of the resistance-capacitance voltage divider according to claim 2, wherein the algorithm for optimally solving the resistance-capacitance parameters specifically comprises the following steps: any one of a least square optimization method, a steepest descent method, a newton method, a gauss-newton method, or a levenberg-marquardt method.

5. The method for measuring the RC parameter of the RC voltage divider according to claim 1, wherein the transfer function of the voltage dividing ratio is specifically as follows:

k′＝Z₂/(Z₁+Z₂)

wherein k' is the partial pressure ratio, Z₁For the impedance parameter of the high-voltage arm of the RC voltage divider, Z₂And the impedance parameter of the low-voltage arm of the resistance-capacitance voltage divider is obtained.

6. A resistance-capacitance parameter measuring device of a resistance-capacitance voltage divider is characterized by comprising:

the first frequency response testing unit is used for measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response testing mode based on the resistance-capacitance voltage divider to be measured;

the second frequency response testing unit is used for measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through the frequency response testing mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and is a state when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel;

and the resistance-capacitance parameter calculating unit is used for performing solving calculation by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference so as to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

7. The apparatus as claimed in claim 6, wherein when the second voltage division ratio difference and the second voltage division ratio angle difference are multiple sets of parameters obtained by connecting the nominal capacitance in parallel for multiple times, the algorithm for solving the resistance-capacitance parameters is specifically an algorithm for optimally solving the resistance-capacitance parameters, and if not, the algorithm for solving the resistance-capacitance parameters is specifically an algorithm for iteratively solving the resistance-capacitance parameters.

8. The apparatus as claimed in claim 6, wherein the iterative solution algorithm for rc parameters specifically comprises: newton's algorithm, confidence domain algorithm, or heuristic algorithm.

9. The apparatus of claim 7, wherein the rc parameter optimization solution algorithm specifically comprises: any one of a least square optimization method, a steepest descent method, a newton method, a gauss-newton method, or a levenberg-marquardt method.

10. The apparatus of claim 6, wherein the transfer function of the voltage divider ratio is specifically:

k′＝Z₂/(Z₁+Z₂)

wherein k' is the partial pressure ratio, Z₁For the impedance parameter of the high-voltage arm of the RC voltage divider, Z₂And the impedance parameter of the low-voltage arm of the resistance-capacitance voltage divider is obtained.

Technical Field

The application relates to the technical field of power measurement, in particular to a method and a device for measuring resistance-capacitance parameters of a resistance-capacitance voltage divider.

Background

The high-voltage measuring device is an important link in a direct-current metering system and a direct-current control protection system, and is closely related to the running reliability of a direct-current power transmission system. With the development of high-voltage power transmission technology, a high-voltage power transmission control protection system puts higher frequency response characteristic requirements on a resistance-capacitance voltage divider used in engineering. The resistance-capacitance voltage divider can be divided into a resistance voltage dividing type and a resistance-capacitance voltage dividing type according to the measuring principle, can realize the accurate measurement of high voltage, but is easy to cause the breakdown of components due to the uneven local voltage division under the impact voltage due to the existence of a space stray capacitor, so that the resistance-capacitance voltage divider is mainly used as a standard apparatus in a laboratory. Dc voltage measuring devices for field use typically employ a resistive-capacitive voltage divider. In order to ensure that the resistance-capacitance voltage divider has linear frequency response characteristics, each voltage dividing branch of the voltage divider should have the same resistance-capacitance time constant.

In the field operation process, R1, C1, R2 and C2 can change, and the voltage division ratio of the resistance-capacitance voltage divider is influenced, and the measurement accuracy is influenced. In order to evaluate or judge whether the measurement accuracy of the resistance-capacitance voltage divider changes, the resistance-capacitance parameter needs to be measured. However, in the existing method, the rc voltage divider is generally disassembled, and the resistance and capacitance of the high-voltage and low-voltage arms are measured separately. The method can directly measure, but is time-consuming, labor-consuming and not convenient for field application.

Disclosure of Invention

The application provides a method and a device for measuring resistance-capacitance parameters of a resistance-capacitance voltage divider, which are used for solving the technical problem of complex measurement when the resistance-capacitance parameters of the existing resistance-capacitance voltage divider are measured.

The application provides a method for measuring resistance-capacitance parameters of a resistance-capacitance voltage divider in a first aspect, which comprises the following steps:

measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response test mode based on the resistance-capacitance voltage divider to be measured;

measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through the frequency response test mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and the state is when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel;

and performing solving calculation by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference so as to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

Preferably, when the second voltage division ratio difference and the second voltage division ratio angle difference are a plurality of groups of parameters obtained by connecting the nominal capacitors in parallel for a plurality of times, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter optimization solving algorithm, and if not, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter iteration solving algorithm.

Preferably, the iterative solution algorithm for resistance-capacitance parameters specifically includes: newton's algorithm, confidence domain algorithm, or heuristic algorithm.

Preferably, the resistance-capacitance parameter optimization solving algorithm specifically includes: any one of a least square optimization method, a steepest descent method, a newton method, a gauss-newton method, or a levenberg-marquardt method.

Preferably, the voltage division ratio transfer function is specifically:

k′＝Z₂/(Z₁+Z₂)

wherein k' is the partial pressure ratio, Z₁For the impedance parameter of the high-voltage arm of the RC voltage divider, Z₂And the impedance parameter of the low-voltage arm of the resistance-capacitance voltage divider is obtained.

The second aspect of the present application provides a resistance-capacitance parameter measuring apparatus for a resistance-capacitance voltage divider, including:

the first frequency response testing unit is used for measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response testing mode based on the resistance-capacitance voltage divider to be measured;

the second frequency response testing unit is used for measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through the frequency response testing mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and is a state when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel;

and the resistance-capacitance parameter calculating unit is used for performing solving calculation by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference so as to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

Preferably, when the second voltage division ratio difference and the second voltage division ratio angle difference are a plurality of groups of parameters obtained by connecting the nominal capacitors in parallel for a plurality of times, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter optimization solving algorithm, and if not, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter iteration solving algorithm.

Preferably, the iterative solution algorithm for resistance-capacitance parameters specifically includes: newton's algorithm, confidence domain algorithm, or heuristic algorithm.

Preferably, the resistance-capacitance parameter optimization solving algorithm specifically includes: any one of a least square optimization method, a steepest descent method, a newton method, a gauss-newton method, or a levenberg-marquardt method.

Preferably, the voltage division ratio transfer function is specifically:

k′＝Z₂/(Z₁+Z₂)

wherein k' is the partial pressure ratio, Z₁For the impedance parameter of the high-voltage arm of the RC voltage divider, Z₂And the impedance parameter of the low-voltage arm of the resistance-capacitance voltage divider is obtained.

According to the technical scheme, the embodiment of the application has the following advantages:

the application provides a resistance-capacitance parameter measuring method of a resistance-capacitance voltage divider, which comprises the following steps: measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response test mode based on the resistance-capacitance voltage divider to be measured; measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through the frequency response test mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and the state is when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel; and performing solving calculation by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference so as to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

The application provides a resistance-capacitance voltage divider resistance-capacitance parameter measuring method, based on the resistance-capacitance voltage divider to be measured, through a frequency response test mode, the voltage division ratio difference and the voltage division ratio angular difference of the resistance-capacitance voltage divider in different states are respectively measured, then based on the measured voltage division ratio difference and the measured voltage division ratio angular difference, solution calculation is carried out by combining the voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solution algorithm, the resistance-capacitance parameters of the resistance-capacitance voltage divider can be obtained without disassembling the resistance-capacitance voltage divider, and the technical problem that the existing resistance-capacitance voltage divider measuring technology is complicated in measurement is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic diagram of a frequency response test of a rc voltage divider in an initial state provided in the present application.

Fig. 2 is a schematic diagram of a frequency response test of the rc-divider in the second state provided in the present application.

Fig. 3 is a schematic flowchart of an embodiment of a method for measuring a resistance-capacitance parameter of a resistance-capacitance voltage divider according to the present application.

Fig. 4 is a schematic structural diagram of an embodiment of a resistance-capacitance parameter measuring apparatus of a resistance-capacitance voltage divider according to the present application.

Detailed Description

The existing technology for measuring the resistance-capacitance parameters of the resistance-capacitance voltage divider comprises the following steps: however, when these measurement techniques are applied to a moving rc voltage divider, it is difficult to directly measure the rc parameters of the high and low voltage arms because it is difficult to disconnect the rc elements in the body of the rc voltage divider. Although the method for measuring the CVT capacitance by the penicillin bridge is feasible, when the capacitance of the high-voltage arm is measured by the positive connection method, one-time connection is needed to be removed. When the reverse connection method is used, the low-voltage arm capacitor and the electromagnetic unit need to be shielded, the test process is complex, the bridge is difficult to balance, and the method is easily influenced by various field parameters.

In the field operation process, R1, C1, R2 and C2 can change, and the voltage division ratio of the resistance-capacitance voltage divider is influenced, and the measurement accuracy is influenced. In order to evaluate or judge whether the measurement accuracy of the resistance-capacitance voltage divider changes, the resistance-capacitance parameter needs to be measured. However, in the existing method, the rc voltage divider is generally disassembled, and the resistance and capacitance of the high-voltage and low-voltage arms are measured separately. The method can directly measure, but is time-consuming, labor-consuming and not convenient for field application.

The embodiment of the application provides a resistance-capacitance parameter measuring system of a resistance-capacitance voltage divider, which is used for solving the technical problem that the existing resistance-capacitance voltage divider measuring technology is complex in measurement.

In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 to fig. 3, a first aspect of the present application provides a method for measuring a resistance-capacitance parameter of a resistance-capacitance voltage divider, including:

s1, measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state through a frequency response test mode based on the resistance-capacitance voltage divider to be measured;

s2, measuring a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through a frequency response test mode, wherein the second state is based on the resistance-capacitance voltage divider in the initial state, and the state is when a low-voltage arm of the resistance-capacitance voltage divider is connected with a nominal capacitor in parallel;

and S3, based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference, solving and calculating by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

It should be noted that, as shown in fig. 1 and fig. 2, the present application changes the equivalent frequency response parameter of the rc voltage divider by connecting a plurality of standard capacitive loads in parallel at U2. By measuring the frequency response parameters (specific difference and angular difference), R1, C1, R2 and C2 were calculated by using formulae.

As shown in fig. 1, the impedance parameters of the high-low voltage arm are:

Z₁＝R₁/(1+j2πfR₁C₁) (1)

Z₂＝R₂/(1+j2πfR₂C₂) (2)

the actual voltage division ratio transfer function is:

k′＝Z₂/(Z₁+Z₂) (3)

the frequency response test under power frequency can be carried out on the resistance-capacitance voltage divider through the frequency test source and the standard resistance voltage divider on site, and the voltage division ratio difference epsilon of the voltage division ratio is actually measured₁And the differential pressure angle difference delta phi₁。ε₁、Δφ₁It should satisfy:

ε₁＝(abs(k′)-k_n)/k_n (4)

Δφ₁＝angle(k) (5)

in the formula, abs (, and angle (, respectively) represent a magnitude operator and a phase angle operator of the complex parameter, and Kn ═ R2/(R1+ R2).

At this time, a nominal capacitive load Δ C with a known magnitude is connected in parallel to the low-voltage arm, and the nominal capacitive load is connected at point U2 in a capacitive load manner, where C2 in fig. 2 becomes (C2+ Δ C), and equation (2) becomes:

Z₂＝R₂/(1+j2πfR₂(C₂+ΔC))

the frequency response test is carried out on the resistance-capacitance voltage divider again by the same method, and the voltage division ratio difference epsilon of the voltage division ratio can be obtained₂And the differential pressure angle difference delta phi₂。

ε₂＝(abs(k′)-k_n)/k_n (6)

Δφ₂＝angle(k) (7)

The equations (1) - (3) are substituted into the equations (4) - (5) to obtain two nonlinear equation system equations, and each test can obtain two nonlinear equation system equations. Two new nonlinear equations can be obtained by substituting equations (1) to (3) into equations (6) to (7).

Is recorded as:

ε₁＝f₁(R₁，R₂，C₁，C₂)

Δφ₁＝f₂(R₁，R₂，C₁，C₂)

ε₂＝f₃(R₁，R₂，C₁，C₂，ΔC)

Δφ₂＝f₄(R₁，R₂，C₁，C₂，ΔC)

further, when the second voltage division ratio difference and the second voltage division ratio angle difference are multiple groups of parameters obtained by connecting the nominal capacitors in parallel for multiple times, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter optimization solving algorithm, and if not, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter iteration solving algorithm.

Further, the resistance-capacitance parameter iterative solution algorithm specifically includes: newton method, modified newton method, parametric newton method, falling newton method, confidence domain method or heuristic algorithm.

Further, the resistance-capacitance parameter optimization solving algorithm specifically includes: least squares optimization, steepest descent, newton, gauss-newton or levenberg-marquardt.

It should be noted that, the resistance-capacitance parameter solution algorithm may adopt: if the resistance-capacitance parameter iterative solution algorithm is adopted, as Delta C is a known nominal capacitance value, epsilon₁、ε₂、Δφ₁、Δφ₂The measured values of the voltage division ratio difference and the voltage division ratio angle difference are obtained by field frequency tests.

At this time,. epsilon₁、ε₂、Δφ₁、Δφ₂Δ C is a known quantity, R₁、R₂、C₁、C₂For unknown quantity, the four nonlinear variance groups are connected, and R can be solved by using a Newton algorithm (Newton method, modified Newton method, parameter Newton method, descending Newton method), confidence domain method, heuristic algorithm (genetic algorithm, particle swarm algorithm, ant colony algorithm, etc.), and other solving algorithms₁、R₂、C₁、C₂And (6) solving. Realize the counter resistanceAnd measuring the resistance-capacitance parameters of the capacitance-voltage divider.

If the resistance-capacitance parameter optimization solving algorithm is adopted, more nonlinear equation set equations can be obtained by connecting the nominal capacitance in parallel for multiple times at the low-voltage arm,

ε₁＝f₁(R₁，R₂，C₁，C₂)

Δφ₁＝f₂(R₁，R₂，C₁，C₂)

ε₂＝f₃(R₁，R₂，C₁，C₂，ΔC1)

Δφ₂＝f₄(R₁，R₂，C₁，C₂，ΔC1)

ε₃＝f₅(R₁，R₂，C₁，C₂，ΔC2)

Δφ₃＝f₆(R₁，R₂，C₁，C₂，ΔC2)

......

ε_i＝f_2i-1(R₁，R₂，C₁，C₂，ΔCi)

Δφ_i＝f_2i(R₁，R₂，C₁，C₂，ΔCi)

......

note the book

F_2i-1＝f_2i-1(R₁，R₂，C₁，C₂，ΔCi)-ε_i

This problem can be converted into an optimized solution to the following three non-linear least squares problems.

Formula | | | F_i||_mWherein, when m is 1, the expression is 1 norm; when m is 2, the expression is 2 norm; when m is p, the expression is p norm.

At this time,. epsilon₁、ε₂、Δφ₁、Δφ₂Δ C1, Δ C2, …, Δ C, … are known amounts, R is₁、R₂、C₁、C₂For unknown quantity, i times of test results can obtain 2i F_i。

In addition to the least square optimization solving algorithm, the R can be solved by utilizing numerical solving algorithms such as nonlinear optimization and the like, such as a steepest descent method, a Newton method, a Gaussian Newton method, a Levenberg-Marquardt method and the like₁、R₂、C₁、C₂And performing parameter estimation on the four unknown quantities to realize the measurement of the resistance-capacitance parameters of the resistance-capacitance voltage divider.

The above is a detailed description of an embodiment of a resistance-capacitance parameter measuring method of a resistance-capacitance voltage divider provided by the present application, and the following is a detailed description of an embodiment of a resistance-capacitance parameter measuring apparatus of a resistance-capacitance voltage divider provided by the present application.

Referring to fig. 4, a second embodiment of the present application provides a resistance-capacitance parameter measuring apparatus for a resistance-capacitance voltage divider, including:

the first frequency response test unit A1 is used for measuring a first voltage division ratio difference and a first voltage division ratio angle difference of the resistance-capacitance voltage divider in an initial state in a frequency response test mode based on the resistance-capacitance voltage divider to be measured;

the second frequency response test unit a2 is configured to measure a second voltage division ratio difference and a second voltage division ratio angle difference of the resistance-capacitance voltage divider in a second state through a frequency response test mode, where the second state is based on the resistance-capacitance voltage divider in the initial state, and is a state when a low-voltage arm of the resistance-capacitance voltage divider is connected in parallel with a nominal capacitor;

and the resistance-capacitance parameter calculation unit A3 is used for performing solving calculation based on the first voltage division ratio difference, the first voltage division ratio angle difference, the second voltage division ratio difference and the second voltage division ratio angle difference by combining a voltage division ratio transfer function of the resistance-capacitance voltage divider and a preset resistance-capacitance parameter solving algorithm to obtain the resistance-capacitance parameters of the resistance-capacitance voltage divider.

Further, when the second voltage division ratio difference and the second voltage division ratio angle difference are multiple groups of parameters obtained by connecting the nominal capacitors in parallel for multiple times, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter optimization solving algorithm, and if not, the resistance-capacitance parameter solving algorithm is specifically a resistance-capacitance parameter iteration solving algorithm.

Further, the resistance-capacitance parameter iterative solution algorithm specifically includes: newton's algorithm, confidence domain algorithm, or heuristic algorithm.

Further, the resistance-capacitance parameter optimization solving algorithm specifically includes: any one of a least square optimization method, a steepest descent method, a newton method, a gauss-newton method, or a levenberg-marquardt method.

Further, the transfer function of the voltage division ratio is specifically:

k′＝Z₂/(Z₁+Z₂)

wherein k' is the partial pressure ratio, Z₁For the impedance parameter of the high-voltage arm of the RC voltage divider, Z₂Is the impedance parameter of the low-voltage arm of the resistance-capacitance voltage divider.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.