CN101393255A - Calibration device for zinc oxide arrester tester - Google Patents
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 32
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Abstract
一种氧化锌避雷器测试仪校验装置，包括控制器、信号产生模块、精密电流源模块、参比电压回路信号调理模块、精密四端电阻和精密电压互感器。在控制器的作用下，每个信号产生模块产生独立的幅值、频率、相角可调的高度平滑正弦信号，这些正弦信号对后级各自独立的精密电流源模块、参比电压回路信号调理模块、精密电压互感器进行激励，从而形成相互独立的各次电流分量和电压分量驱动信号，电流分量通过直接并联相加，合成并输出全电流，电压分量通过驱动精密电压互感器副边串联相加输出参比电压。利用该校验装置可以对氧化锌避雷器测试仪主要的测量功能即全电流、阻性电流、容性电流、参比电压、相角、谐波分量等测量功能进行高准确度的校验。
A calibration device for a zinc oxide arrester tester includes a controller, a signal generating module, a precision current source module, a reference voltage loop signal conditioning module, a precision four-terminal resistance and a precision voltage transformer. Under the action of the controller, each signal generation module generates an independent highly smooth sinusoidal signal with adjustable amplitude, frequency and phase angle. Modules and precision voltage transformers are excited to form independent current components and voltage component drive signals. The current components are directly added in parallel to synthesize and output the full current. The voltage components are connected in series by driving the secondary side of the precision voltage transformer. Add output reference voltage. The calibration device can be used to perform high-accuracy calibration on the main measurement functions of the zinc oxide arrester tester, namely full current, resistive current, capacitive current, reference voltage, phase angle, and harmonic components.
Description
技术领域 technical field
本发明涉及一种氧化锌避雷器测试仪校验装置，属于电力测试仪器的校准、检定与检测领域，利用该校验装置可以对氧化锌避雷器测试仪主要的测量功能即全电流、阻性电流、容性电流、参比电压、相角、谐波分量等测量功能进行高准确度的校验，并且所产生的各次标准电压、标准电流信号均能同步、方便、有效的进行量值溯源。The invention relates to a calibration device for a zinc oxide arrester tester, which belongs to the field of calibration, verification and detection of electric power testing instruments. The calibration device can be used for the main measurement functions of the zinc oxide arrester tester, namely full current, resistive current, Capacitive current, reference voltage, phase angle, harmonic component and other measurement functions are verified with high accuracy, and the generated standard voltage and standard current signals can be traced synchronously, conveniently and effectively.
背景技术 Background technique
随着氧化锌避雷器被广泛应用，电力系统的安全性得到了极大的提高。但是由于氧化锌避雷器工作环境恶劣，容易产生老化等现象，所以对氧化锌避雷器定期进行检测十分必要。鉴于这种情况，国内很多电力测试仪器制造厂家开始研制、生产氧化锌避雷器测试仪。但据调查，国内市场上的氧化锌避雷器测试仪质量参差不齐，对这类测试仪进行校验并对用户提供可靠的校验数据对提高预防性试验的质量具有积极意义。在《DL/T 987-2005氧化锌避雷器阻性电流测试仪通用技术条件》中，明确要求对氧化锌避雷器测试仪的全电流、阻性电流、容性电流等测量功能进行检测。With the widespread application of zinc oxide arresters, the safety of power systems has been greatly improved. However, due to the harsh working environment of zinc oxide arresters, it is prone to aging and other phenomena, so it is necessary to regularly test zinc oxide arresters. In view of this situation, many domestic manufacturers of electrical testing instruments have begun to develop and produce zinc oxide arrester testers. However, according to the survey, the quality of zinc oxide arrester testers in the domestic market is uneven, and it is of positive significance to calibrate such testers and provide reliable calibration data to users to improve the quality of preventive tests. In "DL/T 987-2005 General Technical Conditions for Zinc Oxide Arrester Resistive Current Tester", it is clearly required to test the full current, resistive current, capacitive current and other measurement functions of the zinc oxide arrester tester.
根据申请人所知，目前国内有关技术单位校验氧化锌避雷器测试仪的方法主要包括：传统的RC阻容网络法和普通标准信号源法，各有不足，具体分析如下：According to the knowledge of the applicant, the current methods for calibrating zinc oxide arrester testers by relevant domestic technical units mainly include: the traditional RC resistance-capacitance network method and the ordinary standard signal source method, each has its own shortcomings, and the specific analysis is as follows:
其中，传统的RC阻容网络法，其原理是：在工频电压(即参比电压)的激励下，通过阻容网络的配置产生与参比电压具有一定相位差的电流信号(即全电流)，产生的参比电压和全电流可用于对氧化锌避雷器测试仪进行校验。该方法的不足是：回路中使用的标准电阻、标准电容受环境影响较大，接线繁琐，操作复杂，对测量结果的影响较大，且测试数据单一，相角问题不易解决，校验工作必须的谐波电压和谐波电流无法产生，且受试品影响导致标准值变化较大，进而影响对氧化锌避雷器测试仪的校准结果Among them, the principle of the traditional RC resistance-capacitance network method is: under the excitation of the power frequency voltage (that is, the reference voltage), the configuration of the resistance-capacitance network generates a current signal with a certain phase difference from the reference voltage (that is, the full current ), the generated reference voltage and full current can be used to calibrate the zinc oxide arrester tester. The disadvantages of this method are: the standard resistance and standard capacitance used in the circuit are greatly affected by the environment, the wiring is cumbersome, the operation is complicated, and the impact on the measurement results is relatively large, and the test data is single, the phase angle problem is not easy to solve, and the calibration work must The harmonic voltage and harmonic current cannot be generated, and the influence of the tested product leads to a large change in the standard value, which in turn affects the calibration results of the zinc oxide arrester tester
其中，普通标准信号源方法，其原理是：利用电子电路等技术，产生标准信号源即直接给出一路参比电压信号和一路全电流信号，用以对氧化锌避雷器测试仪进行校验。利用该方法产生的参比电压和全电流基本可以实现含有各次谐波电压和谐波电流分量。该方法的不足是：仅通过这种思路设计的校验装置本身的量值溯源很难得到保证，比如采取普通标准信号源法给出的全电流时，各次谐波电流的幅值、相位、频率等参数很难高准确度的溯源，简单的说就是难以得到验证，其原因在于：这些谐波电流分量包含在全电流里，对这些分量进行溯源时只能通过信号分析(比如傅里叶变换等)手段“间接”的计算出来，这种“间接”的计算或提取过程无疑会降低谐波电流分量溯源结果的可信度，其结果就是导致基于该方法的氧化锌避雷器测试仪校验装置的设计方案很难保证全电流中各次谐波电流分量的良好溯源性，也就是各次谐波电流分量的幅值、相位、频率到底准确与否很难说清楚；同理，基于普通标准信号源给出的参比电压含谐波电压时，各次谐波电压的幅值、相位、频率等参数很难高准确度的溯源。Among them, the general standard signal source method, its principle is: use electronic circuit and other technologies to generate a standard signal source, that is, directly provide a reference voltage signal and a full current signal, which are used to calibrate the zinc oxide arrester tester. The reference voltage and full current generated by this method can basically contain various harmonic voltage and harmonic current components. The disadvantage of this method is that the traceability of the value of the calibration device itself designed only through this idea is difficult to be guaranteed. For example, when the full current given by the ordinary standard signal source method is adopted, the amplitude and phase of each harmonic current Parameters such as frequency and frequency are difficult to trace to the source with high accuracy. Simply put, it is difficult to be verified. The reason is that these harmonic current components are included in the full current, and the source of these components can only be traced through signal analysis (such as Fourier Leaf transform, etc.) means "indirect" calculation, this "indirect" calculation or extraction process will undoubtedly reduce the credibility of the traceability results of harmonic current components, the result is that the zinc oxide arrester tester calibration based on this method It is difficult to ensure good traceability of each harmonic current component in the full current, that is, it is difficult to tell whether the amplitude, phase, and frequency of each harmonic current component are accurate or not; similarly, based on common When the reference voltage given by the standard signal source contains harmonic voltage, it is difficult to trace the source of the parameters such as the amplitude, phase, and frequency of each harmonic voltage with high accuracy.
综上所述，目前国内可以参考的校验装置和校验方法在工作原理和可溯源性上均存在不足，准确度不能满足要求，市场上大量的氧化锌避雷器测试仪标称的最大允许误差只达到幅值测量0.5％，角度测量0.2°左右，急需设计具有良好可溯源性的氧化锌避雷器测试仪校验装置，也就是准确度高并且可以得到有效验证的氧化锌避雷器测试仪校验装置，满足目前校验工作的紧迫需要。To sum up, the calibration devices and calibration methods that can be referred to in China are insufficient in terms of working principle and traceability, and the accuracy cannot meet the requirements. The nominal maximum allowable error of a large number of zinc oxide arrester testers on the market It only reaches 0.5% of the amplitude measurement and about 0.2° of the angle measurement. It is urgent to design a zinc oxide arrester tester calibration device with good traceability, that is, a zinc oxide arrester tester calibration device with high accuracy and effective verification , to meet the urgent needs of the current calibration work.
发明内容 Contents of the invention
本发明的目的是针对现有氧化锌避雷器测试仪校验装置设计原理上的不足，尤其是校验装置在可溯源性上的不足进行了改进，提供一种氧化锌避雷器测试仪校验装置，具有良好可溯源性，并提高校验精度。The purpose of the present invention is to improve the deficiencies in the design principle of the existing zinc oxide arrester tester calibration device, especially the lack of traceability of the calibration device, to provide a zinc oxide arrester tester calibration device, It has good traceability and improves calibration accuracy.
为了实现上述目的，本发明技术方案提供一种氧化锌避雷器测试仪校验装置，由控制器、信号产生模块、精密电流源模块、参比电压回路信号调理模块、精密四端电阻、精密电压互感器组成，其特征在于：控制器的输出控制信号分别连接5个信号产生模块的控制端，其中有3个信号产生模块的输出分别连接相应的3个精密电流源模块的输入，3个精密电流源模块分别通过相应的3个精密四端电阻输出相应的电流分量，并联后各电流分量叠加提供全电流输出，其中有2个信号产生模块的输出分别连接相应的2个参比电压回路信号调理模块的输入，2个参比电压回路信号调理模块的输出分别与相应2个精密电压互感器原边相连接，通过偶合，2个精密电压互感器的副边分别输出相应的电压分量，2个精密电压互感器的副边相串联后电压分量叠加提供参比电压输出。In order to achieve the above object, the technical solution of the present invention provides a zinc oxide arrester tester calibration device, which consists of a controller, a signal generation module, a precision current source module, a reference voltage loop signal conditioning module, a precision four-terminal resistance, and a precision voltage mutual inductance It is composed of a device, which is characterized in that: the output control signal of the controller is respectively connected to the control terminals of 5 signal generation modules, and the outputs of 3 signal generation modules are respectively connected to the inputs of the corresponding 3 precision current source modules, and the 3 precision current source modules are connected respectively. The source modules respectively output the corresponding current components through the corresponding three precision four-terminal resistors. After parallel connection, each current component is superimposed to provide a full current output, and the outputs of two signal generation modules are respectively connected to the corresponding two reference voltage loop signal conditioning The input of the module and the output of the two reference voltage loop signal conditioning modules are respectively connected to the primary sides of the corresponding two precision voltage transformers. Through coupling, the secondary sides of the two precision voltage transformers output corresponding voltage components respectively, and the two The secondary side of the precision voltage transformer is connected in series, and the voltage components are superimposed to provide a reference voltage output.
其工作原理为：在控制器的控制作用下，每个信号产生模块可以产生独立的幅值、频率、相角可调的高度平滑的正弦信号单元，这些正弦信号单元可对后级各自独立的精密电流源模块、参比电压回路信号调理模块、精密电压互感器进行激励，从而形成相互独立的各次电流分量和电压分量驱动信号，并且各次电流分量通过直接并联相加，最终合成并输出含有各次谐波分量的全电流，而电压分量驱动信号则通过驱动精密电压互感器偶合，其副边串联相加并最终输出含有各次谐波分量的参比电压。Its working principle is: under the control of the controller, each signal generation module can generate independent highly smooth sinusoidal signal units with adjustable amplitude, frequency and phase angle, and these sinusoidal signal units can be used independently for the subsequent stages. The precision current source module, the reference voltage loop signal conditioning module, and the precision voltage transformer are excited to form independent current components and voltage component drive signals, and the current components are directly added in parallel, and finally synthesized and output The full current containing each harmonic component, while the voltage component driving signal is coupled by driving a precision voltage transformer, and its secondary sides are added in series to finally output a reference voltage containing each harmonic component.
如上所述的氧化锌避雷器测试仪校验装置，其特征在于：信号产生模块采取基于DDS芯片AD9951的电路，用DDS芯片的直接数字合成技术来方便的产生频率稳定可调、幅值稳定可调、相位稳定可调并且曲线高度平滑稳定的正弦信号。The zinc oxide arrester tester calibration device as described above is characterized in that: the signal generation module adopts a circuit based on the DDS chip AD9951, and uses the direct digital synthesis technology of the DDS chip to conveniently generate stable and adjustable frequency and stable and adjustable amplitude. , The phase is stable and adjustable, and the curve is highly smooth and stable sinusoidal signal.
其次，本发明在设计上还采用了如下核心技术：Secondly, the present invention has also adopted following core technology in design:
1、幅值、频率和相位稳定可调且曲线平滑的正弦信号产生模块1. A sinusoidal signal generation module with stable and adjustable amplitude, frequency and phase and smooth curve
为了达到高准确度的校验目的，首先需要生成若干基本的正弦信号单元，这些正弦信号单元将用来激励后置的电流源电路和恒压源电路并产生相应的标准参比电压和标准全电流。为了首先获得幅值和频率稳定可调、且曲线平滑的正弦信号单元，采取了直接数字合成技术即DDS芯片来产生正弦信号。直接数字合成技术目前主要在高频信号领域采取较多，在电气测试领域使用还较少。其主要特点是基于直接数字合成理论，提出了一种频率可高速变化的正弦信号(或任意周期波形)产生办法，这种技术应用在本发明中可方便的产生频率稳定可调、幅值稳定可调、相位稳定可调并且曲线高度平滑稳定的正弦信号。其中：正弦信号的频率除了可为50Hz基波外，还可方便的配置成各次谐波频率，并且非常稳定；正弦信号的幅值分辨率可达14位，满足本发明的需要；更重要的是正弦信号曲线虽然仍为离散化的，但是曲线幅值的刷新间隔小于1us，非常平滑，通过普通示波器已看不到“阶梯”，这种“曲线高度平滑”的效果完全可以避免采取后续的滤波电路，从而大大减少的滤波电路带来的幅值和相位的负面效应。In order to achieve the purpose of high-accuracy calibration, it is first necessary to generate several basic sinusoidal signal units, which will be used to excite the rear current source circuit and constant voltage source circuit and generate corresponding standard reference voltage and standard full voltage. current. In order to obtain a sinusoidal signal unit with stable and adjustable amplitude and frequency, and a smooth curve, a direct digital synthesis technology (DDS chip) is used to generate sinusoidal signals. Direct digital synthesis technology is mainly used in the field of high-frequency signals at present, and it is rarely used in the field of electrical testing. Its main feature is that based on the theory of direct digital synthesis, a method of generating a sinusoidal signal (or arbitrary periodic waveform) whose frequency can be changed at a high speed is proposed. This technology can be easily used in the present invention to generate stable and adjustable frequency and stable amplitude. Sine signal with adjustable, stable and adjustable phase and smooth and stable curve height. Wherein: except that the frequency of the sinusoidal signal can be 50Hz fundamental wave, it can also be easily configured into each harmonic frequency, and is very stable; the amplitude resolution of the sinusoidal signal can reach 14 bits, which meets the needs of the present invention; more importantly The most important thing is that although the sinusoidal signal curve is still discretized, the refresh interval of the curve amplitude is less than 1us, which is very smooth, and the "staircase" can no longer be seen through ordinary oscilloscopes. This "highly smooth curve" effect can completely avoid taking follow-up The filter circuit greatly reduces the negative effect of amplitude and phase brought by the filter circuit.
2、精密电流源电路和参比电压回路信号调理电路的设计采取了“模块”化的方式2. The design of the precision current source circuit and the signal conditioning circuit of the reference voltage loop adopts a "modular" approach
本发明对核心的精密电流源电路和参比电压回路信号调理电路在设计上采取了“模块”化的方式。即每个精密电流源模块或参比电压回路信号调理模块的输入信号为一个独立纯净的正弦信号，该信号来自直接数字合成电路即DDS芯片，在独立的幅频可调的正弦信号的激励下，每个精密电流源模块或参比电压回路信号调理模块可分别输出不同幅值、频率、相位的电流、电压分量，这些电流、电流分量可作为全电流和参比电压的各个分量，并且每个精密电流源模块选取了高性能器件，接近输出阻抗无穷大的理想电流源要求，并且基于输出阻抗接近无穷大的特点，这些精密电流源模块可以直接并联以合成全电流信号，达到电流相加的目的。同时参比电压回路信号调理模块也可是直接串联合成参比电压信号。基于这种“模块”化思想，本发明形成了如下特点：在输出全电流和参比电压的同时能将各次电流分量和电压分量分别引出，这种方式有利于在本校验装置去上级单位溯源时可以在输出全电流和参比电压的背景下同时根据需要引出各次电流分量和电压分量，也就是可以“同步”对任意谐波分量的幅值、频率、相位进行溯源，大大提高了溯源结果的有效性，保证了本校验装置产生的各次谐波分量的准确度。The present invention adopts a "modular" approach to the design of the core precision current source circuit and the reference voltage loop signal conditioning circuit. That is to say, the input signal of each precision current source module or reference voltage loop signal conditioning module is an independent pure sinusoidal signal, which comes from a direct digital synthesis circuit (DDS chip), under the excitation of an independent amplitude-frequency adjustable sinusoidal signal , each precision current source module or reference voltage loop signal conditioning module can output current and voltage components with different amplitudes, frequencies and phases respectively, and these current and current components can be used as various components of the full current and reference voltage, and each A precision current source module selects high-performance devices, which are close to the requirements of an ideal current source with infinite output impedance, and based on the characteristics of the output impedance being close to infinity, these precision current source modules can be directly connected in parallel to synthesize a full current signal to achieve the purpose of current addition . At the same time, the reference voltage loop signal conditioning module can also be directly connected in series to synthesize the reference voltage signal. Based on this "modular" idea, the present invention forms the following features: while outputting the full current and the reference voltage, each current component and voltage component can be separately drawn out. When tracing the source of the unit, various current components and voltage components can be drawn out as needed under the background of outputting full current and reference voltage, that is, the amplitude, frequency, and phase of any harmonic component can be traced "synchronously", greatly improving This ensures the validity of the traceability results and ensures the accuracy of the harmonic components generated by the calibration device.
3、精密电压源的设计中采取了精密电压互感器3. Precision voltage transformers are adopted in the design of precision voltage sources
本发明在输出参比电压时，专门制作了原边低压，副边高压的高精度电压互感器。通过这种输出方式避免了利用高压功率放大器升压的不足。When outputting the reference voltage, the present invention specially manufactures a high-precision voltage transformer with low voltage on the primary side and high voltage on the secondary side. This output method avoids the shortage of using a high-voltage power amplifier to boost the voltage.
本发明的有益效果是，使用本氧化锌避雷器测试仪校验装置，可以对氧化锌避雷器测试仪主要的测量功能即全电流、阻性电流、容性电流、参比电压、相角、谐波分量等测量功能进行高准确度的校验，并且所产生的各次标准电压、标准电流信号均能同步、方便、有效的进行量值溯源。并且重要特点在于各次电压、电流分量均可以在同一时刻通过相应的回路“同步”进行溯源，验证其准确度。The beneficial effect of the present invention is that, using the calibration device of the zinc oxide arrester tester, the main measurement functions of the zinc oxide arrester tester, namely full current, resistive current, capacitive current, reference voltage, phase angle, harmonic High-accuracy verification of measurement functions such as components, and the generated standard voltage and standard current signals can be synchronously, conveniently and effectively traced to the source of the value. And the important feature is that each voltage and current component can be traced through the corresponding loop "synchronously" at the same time to verify its accuracy.
附图说明 Description of drawings
图1，是传统的基于标准信号源法的氧化锌避雷器测试仪校验装置原理示意图。Figure 1 is a schematic diagram of the principle of a traditional zinc oxide arrester tester calibration device based on the standard signal source method.
图2，是本发明实施例的氧化锌避雷器测试仪校验装置原理框图。Fig. 2 is a schematic block diagram of a calibration device for a zinc oxide arrester tester according to an embodiment of the present invention.
图3.1，是图2中控制器的电路原理图。Figure 3.1 is the schematic circuit diagram of the controller in Figure 2.
图3.2，是图2中一路信号产生模块的电路原理图。Figure 3.2 is the schematic circuit diagram of one signal generating module in Figure 2.
图3.3，是图2中一路精密电流源模块电路原理图。Figure 3.3 is a circuit schematic diagram of a precision current source module in Figure 2.
图3.4，是图2中一路参比电压回路信号调理模块和精密电压互感器的电路原理图。Figure 3.4 is a circuit schematic diagram of a reference voltage loop signal conditioning module and precision voltage transformer in Figure 2.
具体实施方式 Detailed ways
以下结合附图和实施例对本发明做进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
图中的标记：1—控制器，21、22、23、24、25—信号产生模块，31、32、33—精密电流源模块，34、35—参比电压回路信号调理模块，41、42、43—精密四端电阻，54、55—精密电压互感器，Ia1、Ia2、Ia3—电流分量，Ua1、Ua2—电压分量，I—全电流，U—参比电压。Marks in the figure: 1—controller, 21, 22, 23, 24, 25—signal generation module, 31, 32, 33—precision current source module, 34, 35—reference voltage loop signal conditioning module, 41, 42 , 43—precision four-terminal resistor, 54, 55—precision voltage transformer, Ia 1 , Ia 2 , Ia 3 —current component, Ua 1 , Ua 2 —voltage component, I—full current, U—reference voltage.
参见图1所示传统的基于标准信号源法的氧化锌避雷器测试仪校验装置原理示意图，是一项电的电路图。它利用该校验装置产生的参比电压U和全电流I基本可以实现含有各次谐波电压和谐波电流分量。该方法的不足是：仅通过这种思路设计的校验装置本身的量值溯源很难得到保证，其分量进行溯源时只能通过信号分析(比如傅里叶变换等)手段“间接”的计算出来，这种“间接”的计算或提取过程无疑会降低谐波分量溯源结果的可信度。See Figure 1 for a schematic diagram of the principle of the traditional calibration device for zinc oxide arrester testers based on the standard signal source method, which is an electrical circuit diagram. It utilizes the reference voltage U and the full current I generated by the verification device to basically realize the harmonic voltage and harmonic current components of each order. The disadvantage of this method is that the traceability of the value of the calibration device itself designed only through this idea is difficult to be guaranteed, and the traceability of its components can only be calculated "indirectly" by means of signal analysis (such as Fourier transform, etc.) This "indirect" calculation or extraction process will undoubtedly reduce the credibility of the harmonic component traceability results.
参见图2所示本发明实施例的氧化锌避雷器测试仪校验装置原理图，这是一项电的相应电路。由控制器1的输出控制信号连接信号产生模块21、22、23、24、25的控制端，信号产生模块21、22、23的输出分别连接相应精密电流源模块31、32、33的输入，精密电流源模块31、32、33的输出分别通过精密四端电阻41、42、43产生输出电流分量Ia1、Ia2、Ia3，并联叠加后产生全电流I输出。信号产生模块24、25的输出分别连接相应参比电压回路信号调理模块34、35的输入，参比电压回路信号调理模块34、35的输出端分别与精密电压互感器54、55原边相连接，通过偶合，精密电压互感器54副边产生电压分量输出Ua1，精密电压互感器55副边产生电压分量输出Ua2，二个精密电压互感器54、55副边相串联使各输出电压Ua1、Ua2叠加，提供参比电压U输出。Referring to the schematic diagram of the zinc oxide arrester tester calibration device of the embodiment of the present invention shown in Figure 2, this is an electrical corresponding circuit. The output control signal of the
其工作原理为：在控制器1(具体为单片机C8051F020)的控制作用下，每个信号产生模块21、22、23、24、25(基于DDS芯片AD9951实现，参见图3.2)可以产生独立的幅值、频率、相角可调的高度平滑的正弦信号单元，这些正弦信号单元可对后级各自独立的精密电流源模块31、32、33(基于精密运放OPA228芯片构成，参见图3.3)、参比电压回路信号调理模块34、35(基于精密高电压运放OPA454芯片构成，参见图3.4)、精密电压互感器54、55进行激励，从而形成相互独立的各次电流分量Ia1、Ia2、Ia3和电压分量Ua1、Ua2驱动信号，并且各次电流分量Ia1、Ia2、Ia3通过直接并联相加，最终合成并输出含有各次谐波分量的全电流I，而电压分量Ua1、Ua2驱动信号则通过驱动精密电压互感器54、55串联相加并最终输出含有各次谐波分量的参比电压U。Its working principle is: under the control of controller 1 (specifically, single-chip microcomputer C8051F020), each
在本实施例中，信号产生模块21、22、23、24、25采取了基于DDS芯片的直接数字合成技术来方便的产生频率稳定可调、幅值稳定可调、相位稳定可调并且曲线高度平滑稳定的正弦信号。In this embodiment, the
在本实施例中，在设计上采取了“模块化叠加”的方式，采用了精密电流源模块31、32、33和参比电压回路信号调理模块34、35。In this embodiment, a "modular superposition" approach is adopted in design, and precision
在本实施例中，为了避免了利用高压功率放大器升压的不足，在设计中采取了通过精密电压互感器54、55来输出参比电压。In this embodiment, in order to avoid the shortage of using a high-voltage power amplifier to boost the voltage, it is adopted in the design to output the reference voltage through
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