CN106646321B - A DC current transformer synchronous calibration method and system - Google Patents
A DC current transformer synchronous calibration method and system Download PDFInfo
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Abstract
本发明示出一种直流电流互感器同步校准方法及系统，其中方法包括：接收标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；同时，接受被校直流电流互感器模拟量电压值和模拟量电流值；获取被校直流电流互感器的数字量电流值；根据模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对直流电流互感器进行校准，根据校准结果，评价被校直流电流互感器的精准度。本方法采用模拟量电压值，模拟量电流值和数字量电流值进行同步的测量校准，利用高稳定度的直流电流源、高精度标准直流比较仪，确保校准的精准度，同时校准方法稳定度高，进而提高了直流电流互感器现场试验的能力。
The invention shows a DC current transformer synchronous calibration method and system, wherein the method includes: receiving the standard analog current value and the standard analog voltage value of the standard DC current comparator; at the same time, receiving the calibrated DC current transformer analog value voltage value and analog current value; obtain the digital current value of the DC current transformer being calibrated; according to the analog voltage value, analog current value, standard analog voltage value, standard analog current value and digital current value, The DC current transformer is calibrated, and based on the calibration results, the accuracy of the calibrated DC current transformer is evaluated. This method uses analog voltage values, analog current values and digital current values for synchronous measurement and calibration. It uses a highly stable DC current source and a high-precision standard DC comparator to ensure the accuracy of the calibration and the stability of the calibration method. High, thereby improving the field test capability of DC current transformers.
Description
技术领域Technical field
本发明涉及直流电流互感器现场测试领域，特别涉及一种直流电流互感器同步校准方法及系统。The invention relates to the field of DC current transformer field testing, and in particular to a DC current transformer synchronous calibration method and system.
背景技术Background technique
在电力系统中，为了保证正常供电及保护贵重设备的安全，都有一套由各种继电器控制设备组成的继电保护线路。当电力系统中发生故障时，这些保护装置就会动作，切断故障的线路，如果是偶然的故障，还能够自动合闸，保证正常供电。直流电流互感器是直流输电系统中测量直流电压的主要设备，为直流输电系统的安全、稳定运行提供控制和护。为了保证直流电流互感器测量信号的准确可靠，需要对直流电流互感器进行现场校准。In the power system, in order to ensure normal power supply and protect the safety of valuable equipment, there is a set of relay protection circuits composed of various relay control devices. When a fault occurs in the power system, these protection devices will act to cut off the faulty line. If the fault is accidental, they can automatically close to ensure normal power supply. DC current transformer is the main equipment for measuring DC voltage in DC transmission system, providing control and protection for the safe and stable operation of DC transmission system. In order to ensure the accuracy and reliability of the DC current transformer measurement signal, the DC current transformer needs to be calibrated on site.
进行现场校准时，传统的直流电流互感器控制校准方法直接将直流高电压施加在被试直流电流互感器和标准分压器的高压端；被试直流电流互感器和标准分压器在低压端输出低压信号，二次测量系统对输出的低压信号进行同步采集、测量，并根据标准分压器的标称变比，获得被试直流电流互感器的实际变比。通过将实测的低压值按额定电压比折算为高压电压值。这种互感器校验方法的自身误差直接叠加到标准互感器的误差之中，同时互感器校验仪的元器件误差限制了传统的直流电流互感器控制校准方法的精准度。例如，一台互感器校验仪由于自身元器件限制，其测量误差限值为±0.05％,即使采用更高精准度的标准互感器,也只能用来检定0.5级以下级别的互感器。因而，这种缺点就限制了直接比较式互感器校验仪的应用范围。When performing on-site calibration, the traditional DC current transformer control calibration method directly applies high DC voltage to the high-voltage end of the tested DC current transformer and standard voltage divider; the tested DC current transformer and standard voltage divider are at the low-voltage end. Output a low-voltage signal, and the secondary measurement system synchronously collects and measures the output low-voltage signal, and obtains the actual transformation ratio of the tested DC current transformer based on the nominal transformation ratio of the standard voltage divider. By converting the measured low voltage value into a high voltage value according to the rated voltage ratio. The error of this transformer calibration method is directly superimposed on the error of the standard transformer. At the same time, the component error of the transformer calibrator limits the accuracy of the traditional DC current transformer control calibration method. For example, a transformer calibrator has a measurement error limit of ±0.05% due to its own component limitations. Even if a higher-precision standard transformer is used, it can only be used to verify transformers below level 0.5. Therefore, this shortcoming limits the application scope of the direct comparison type transformer calibrator.
随着国内高压直流输电工程的增多，对直流互感器的校验提出了新的要求，并已写入直流互感器现场校验和校准试验相关规程和技术标准。传统的直流电流互感器控制校准方法不能满足直流互感器现场校验和校准试验相关规程对准确的要求。With the increase in domestic high-voltage DC transmission projects, new requirements have been put forward for the calibration of DC transformers, and relevant regulations and technical standards for on-site calibration and calibration tests of DC transformers have been written. The traditional DC current transformer control and calibration method cannot meet the accuracy requirements of DC transformer on-site verification and calibration test related regulations.
发明内容Contents of the invention
本发明的发明目的在于提供一种直流电流互感器现场闭环控制校准方法及系统，以解决现有直流电流互感器控制校准方法精准度低的问题。The object of the present invention is to provide a DC current transformer on-site closed-loop control calibration method and system to solve the problem of low accuracy of the existing DC current transformer control calibration method.
本发明实施例第一方面示出一种直流电流互感器同步校准方法，包括：The first aspect of the embodiment of the present invention shows a DC current transformer synchronous calibration method, which includes:
接收标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；Receive the standard analog current value and standard analog voltage value from the standard DC current comparator;
同时，接受被校直流电流互感器模拟量电压值和模拟量电流值；At the same time, it accepts the analog voltage value and analog current value of the DC current transformer being calibrated;
获取所述被校直流电流互感器的数字量电流值；Obtain the digital current value of the calibrated DC current transformer;
根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度。Calibrate the DC current transformer according to the analog voltage value, analog current value, standard analog voltage value, standard analog current value and digital current value, and evaluate the calibrated DC current transformer according to the calibration results. Accuracy of current transformers.
进一步，根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the DC current transformer is calibrated according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and the said DC current transformer is evaluated according to the calibration results. Calibrating the accuracy of DC current transformers, including:
提取所述模拟量电压值的恒流分量，得到直流模拟量电压值；Extract the constant current component of the analog voltage value to obtain the DC analog voltage value;
提取所述标准模拟量电流值的恒流分量，得到直流标准模拟量电流值；Extract the constant current component of the standard analog current value to obtain the DC standard analog current value;
提取数字量电流值的恒流分量，得到直流数字量电流值；Extract the constant current component of the digital current value to obtain the DC digital current value;
根据所述直流模拟量电压值和所述直流标准模拟量电流值，计算出模拟量比值误差；Calculate the analog ratio error based on the DC analog voltage value and the DC standard analog current value;
根据所述标准直流模拟量电流值和所述直流数字量电流值，计算出数字量比值误差；Calculate the digital ratio error based on the standard DC analog current value and the DC digital current value;
根据所述模拟量比值误差或数字量比值误差，评价所述被校直流电流互感器的精准度。According to the analog quantity ratio error or the digital quantity ratio error, the accuracy of the calibrated DC current transformer is evaluated.
进一步，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value are used to calibrate the DC current transformer, and based on the calibration results, the accuracy of the calibrated DC current transformer is evaluated. ,include:
根据所述模拟量电压值和所述标准模拟量电压值，计算出所述模拟量电压值和所述标准模拟量电压值的方差；其中所述模拟量电压值为不同时间点记录的被校直流电流互感器模拟量电压值的数组；所述标准模拟量电压值为不同时间点记录的标准直流比较仪标准模拟量电压值的数组；According to the analog voltage value and the standard analog voltage value, the variance of the analog voltage value and the standard analog voltage value is calculated; wherein the analog voltage value is the calibrated voltage value recorded at different time points. An array of DC current transformer analog voltage values; the standard analog voltage value is an array of standard DC comparator standard analog voltage values recorded at different time points;
根据所述方差计算，评价所述被校直流电流互感器的精准度。According to the variance calculation, the accuracy of the calibrated DC current transformer is evaluated.
进一步，根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the DC current transformer is calibrated according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and the said DC current transformer is evaluated according to the calibration results. Calibrating the accuracy of DC current transformers, including:
提取所述模拟量电压值的恒流分量，得到直流模拟量电压值；Extract the constant current component of the analog voltage value to obtain the DC analog voltage value;
提取所述标准模拟量电压值的恒流分量，得到直流标准模拟量电压值；Extract the constant current component of the standard analog voltage value to obtain the DC standard analog voltage value;
绘制所述直流模拟量电压值在不同频率下的波形图；Draw waveform diagrams of the DC analog voltage value at different frequencies;
绘制所述标准直流模拟量电压值在不同频率下的波形图；Draw waveform diagrams of the standard DC analog voltage values at different frequencies;
根据所述直流模拟量电压值在不同频率下的波形图与所述标准直流模拟量电压值在不同频率下的波形图的匹配度，评价所述被校直流电流互感器的精准度。The accuracy of the calibrated DC current transformer is evaluated based on the matching degree between the waveform diagrams of the DC analog voltage value at different frequencies and the waveform diagrams of the standard DC analog voltage value at different frequencies.
进一步，所述提取所述模拟量电压值的恒流分量为傅氏转化法提取所述模拟量电压值在不同频率下的直流模拟量电压值。Further, the step of extracting the constant current component of the analog voltage value is to extract the DC analog voltage values of the analog voltage value at different frequencies using a Fourier transformation method.
本发明第二方面示出一种直流电流互感器同步校准系统，所述系统包括：The second aspect of the present invention shows a DC current transformer synchronous calibration system. The system includes:
直流电流源，所述直流电流源用于输出恒定电流值；A direct current source, the direct current source is used to output a constant current value;
被校直流电流互感器用于输出模拟量电压值和模拟量电流值；The calibrated DC current transformer is used to output analog voltage values and analog current values;
标准直流比较仪用于输出标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；The standard DC comparator is used to output the standard analog current value and standard analog voltage value of the standard DC current comparator;
数字信号转换单元用于将模拟量电流值转化为数字量电流值；The digital signal conversion unit is used to convert analog current values into digital current values;
直流电子式互感器校验仪用于根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度。The DC electronic transformer calibrator is used to calibrate the DC current transformer according to the analog voltage value, analog current value, standard analog voltage value, standard analog current value and digital current value, According to the calibration results, the accuracy of the calibrated DC current transformer is evaluated.
进一步，所述系统还包括模拟量采集接口单元；Further, the system also includes an analog quantity collection interface unit;
所述模拟量采集接口单元用于对模拟量电压值和所述标准模拟量电压值进行采集滤波处理，提取标准直流模拟量电压值和直流模拟量电压值。The analog quantity acquisition interface unit is used to collect and filter the analog quantity voltage value and the standard analog quantity voltage value, and extract the standard DC analog quantity voltage value and the DC analog quantity voltage value.
进一步，所述系统还包括数字量接口；Further, the system also includes a digital interface;
所述数字量接口用于对数字量电流值进行采集滤波处理，提取数字量电流值的恒流分量，得到直流数字量电流值。The digital quantity interface is used to collect and filter the digital quantity current value, extract the constant current component of the digital quantity current value, and obtain the DC digital quantity current value.
进一步,直流电子式互感器校验仪采用光秒输出法。Furthermore, the DC electronic transformer calibrator adopts the light-second output method.
由以上技术方案可知，本发明示出一种直流电流互感器同步校准方法及系统，其中所述方法包括：接收标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；同时，接受被校直流电流互感器模拟量电压值和模拟量电流值；获取所述被校直流电流互感器的数字量电流值；根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度。本方法采用模拟量电压值，模拟量电流值和数字量电流值进行同步的测量校准，利用高稳定度的直流电流源、高精度标准直流比较仪，采用精确时间同步方式进行信号采集的标定，确保校准的精准度，不受干扰信号影响可有效避免采样分步校准造成的延迟差对被校直流电流互感器的精准度的影响；同时所述校准方法稳定度高，进而提高了直流电流互感器现场试验的能力。As can be seen from the above technical solution, the present invention shows a DC current transformer synchronous calibration method and system, wherein the method includes: receiving the standard analog current value and the standard analog voltage value of the standard DC current comparator; at the same time, receiving The analog voltage value and analog current value of the DC current transformer to be calibrated; obtain the digital current value of the DC current transformer to be calibrated; according to the analog voltage value, analog current value, and standard analog voltage value, Calibrate the DC current transformer using standard analog current values and digital current values, and evaluate the accuracy of the calibrated DC current transformer based on the calibration results. This method uses analog voltage values, analog current values and digital current values for synchronous measurement and calibration, uses a high-stability DC current source, a high-precision standard DC comparator, and uses precise time synchronization for signal acquisition calibration. Ensuring the accuracy of the calibration and not being affected by interference signals can effectively avoid the impact of the delay difference caused by sampling step-by-step calibration on the accuracy of the DC current transformer being calibrated; at the same time, the calibration method is highly stable, thereby improving the DC current mutual inductance Ability to conduct on-site testing of equipment.
附图说明Description of the drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.
图1为根据一优选实施例示出的一种直流电流互感器同步校准方法流程图；Figure 1 is a flow chart of a DC current transformer synchronous calibration method according to a preferred embodiment;
图2为根据一优选实施例示出的一种直流电流互感器同步校准装置的结构框图。Figure 2 is a structural block diagram of a DC current transformer synchronous calibration device according to a preferred embodiment.
图例说明：201-直流电流源；202-被校直流电流互感器；203-标准直流比较仪；204-数字信号转换单元；205-高精度电阻；206-模拟量采集接口单元；207-数字量接口；208-直流电子式互感器校验仪。Legend: 201-DC current source; 202-Calibrated DC current transformer; 203-Standard DC comparator; 204-Digital signal conversion unit; 205-High-precision resistor; 206-Analog acquisition interface unit; 207-Digital quantity Interface; 208-DC electronic transformer calibrator.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
本发明第一方面示出一种直流电流互感器同步校准方法，如图1所示，所述方法包括如下步骤：A first aspect of the present invention shows a DC current transformer synchronous calibration method, as shown in Figure 1. The method includes the following steps:
S101接收标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；S101 receives the standard analog current value and standard analog voltage value from the standard DC current comparator;
S102同时，接受被校直流电流互感器模拟量电压值和模拟量电流值；S102 simultaneously accepts the analog voltage value and analog current value of the DC current transformer being calibrated;
S103获取所述被校直流电流互感器的数字量电流值；S103 obtains the digital current value of the calibrated DC current transformer;
S104根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度。S104 Calibrate the DC current transformer according to the analog voltage value, analog current value, standard analog voltage value, standard analog current value and digital current value, and evaluate the calibrated Accuracy of DC current transformers.
具体的，所述被校直流电流互感器202和标准直流比较仪203同时接入直流电流源201，被校直流电流互感器202输出模拟量电压值和模拟量电流值，直流电子式互感器校验仪208通过模拟量采集接口单元206接收被校直流电流互感器202模拟量电压值和模拟量电流值，标准直流比较仪203输出的电压值通过高精度电阻203转化为标准模拟量电压值和模拟量电流值，直流电子式互感器校验仪208通过模拟量采集接口单元206接收标准模拟量电压值，直流电子式互感器校验仪208根据模拟量电压值，模拟量电流值，标准模拟量电流值和标准模拟量电压值对所述被校直流电流互感器202的精准度进行评价；Specifically, the DC current transformer 202 to be calibrated and the standard DC comparator 203 are connected to the DC current source 201 at the same time. The DC current transformer 202 to be calibrated outputs an analog voltage value and an analog current value. The DC electronic transformer is calibrated. The tester 208 receives the analog voltage value and analog current value of the DC current transformer 202 to be calibrated through the analog acquisition interface unit 206, and the voltage value output by the standard DC comparator 203 is converted into a standard analog voltage value and The analog current value, the DC electronic transformer calibrator 208 receives the standard analog voltage value through the analog acquisition interface unit 206, the DC electronic transformer calibrator 208 receives the standard analog voltage value according to the analog voltage value, the analog current value, the standard analog Use the measured current value and the standard analog voltage value to evaluate the accuracy of the calibrated DC current transformer 202;
同时被校直流电流互感器202模拟量电流值通过数字信号转换单元204转化为数字量电流值，直流电子式互感器校验仪208通过数字量接口207接收数字量电流值。直流电子式互感器校验仪208根据数字量电流值和模拟量电流值对所述被校直流电流互感器202的精准度进行评价。At the same time, the analog current value of the DC current transformer 202 to be calibrated is converted into a digital current value through the digital signal conversion unit 204, and the DC electronic transformer calibrator 208 receives the digital current value through the digital interface 207. The DC electronic transformer calibrator 208 evaluates the accuracy of the calibrated DC current transformer 202 based on the digital current value and the analog current value.
本方法采用模拟量电压值模拟量电流和数字量电流值进行同步的测量校准，可有效以避免采样分步校准造成的延迟差对被校直流电流互感器202的精准度的影响；同时所述校准方法稳定度高，进而提高了直流电流互感器现场试验的能力。This method uses analog voltage values, analog current values and digital current values for synchronous measurement and calibration, which can effectively avoid the impact of the delay difference caused by sampling step-by-step calibration on the accuracy of the DC current transformer 202 to be calibrated; at the same time, as described The calibration method has high stability, thereby improving the field test capability of DC current transformers.
进一步根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the DC current transformer is calibrated according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and based on the calibration results, the calibrated Accuracy of DC current transformers, including:
提取所述模拟量电压值的恒流分量，得到直流模拟量电压值；Extract the constant current component of the analog voltage value to obtain the DC analog voltage value;
提取所述标准模拟量电流值的恒流分量，得到直流标准模拟量电流值；Extract the constant current component of the standard analog current value to obtain the DC standard analog current value;
提取数字量电流值的恒流分量，得到直流数字量电流值；Extract the constant current component of the digital current value to obtain the DC digital current value;
根据所述直流模拟量电压值和所述直流标准模拟量电流值，计算出模拟量比值误差；Calculate the analog ratio error based on the DC analog voltage value and the DC standard analog current value;
根据所述标准直流模拟量电流值和所述直流数字量电流值，计算出数字量比值误差；Calculate the digital ratio error based on the standard DC analog current value and the DC digital current value;
根据所述模拟量比值误差或数字量比值误差，评价所述被校直流电流互感器的精准度。According to the analog quantity ratio error or the digital quantity ratio error, the accuracy of the calibrated DC current transformer is evaluated.
根据所述方差计算，评价所述被校直流电流互感器的精准度。According to the variance calculation, the accuracy of the calibrated DC current transformer is evaluated.
具体的，本方法通过计算所述模拟量比值误差数字量比值误差，通过比值误差来评价所述被校直流电流互感器的精准度。Specifically, this method evaluates the accuracy of the calibrated DC current transformer through the ratio error by calculating the analog quantity ratio error and the digital quantity ratio error.
被校直流电流互感器模拟量的比值误差计算为：The ratio error of the calibrated DC current transformer analog quantity is calculated as:
其中，K为被校直流电流互感器的额定变比，Up为被校直流电流互感器直流模拟量电压值，IB标准直流比较仪直流标准模拟量电流值；Among them, K is the rated transformation ratio of the DC current transformer to be calibrated, U p is the DC analog voltage value of the DC current transformer to be calibrated, and I B is the DC standard analog current value of the standard DC comparator;
被校直流电流互感器数字量比值误差计算为：The digital ratio error of the calibrated DC current transformer is calculated as:
其中，Ic为被校直流电流互感器直流数字量电流值，IB为标准直流比较仪直流标准模拟量电流值。Among them, Ic is the DC digital current value of the DC current transformer being calibrated, and I B is the DC standard analog current value of the standard DC comparator.
具体可以根据积分制评价被校直流电流互感器202的精准度，具体操作是将被校直流电流互感器202的精准度的满分设为100分，计算所述被校直流电流互感器202的模拟量比值误差和数字量比值误差，并根据模拟量比值误差和数字量比值误差的值来对精准度进行扣分，最后再由得分值判定被校直流电流互感器202的精准度。Specifically, the accuracy of the DC current transformer 202 to be calibrated can be evaluated according to the points system. The specific operation is to set the full score of the accuracy of the DC current transformer 202 to be calibrated to 100 points, and calculate the simulation of the DC current transformer 202 to be calibrated. The accuracy is deducted based on the analog ratio error and the digital ratio error. Finally, the accuracy of the DC current transformer 202 to be calibrated is determined by the score value.
进一步，根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the DC current transformer is calibrated according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and the said DC current transformer is evaluated according to the calibration results. Calibrating the accuracy of DC current transformers, including:
根据所述模拟量电压值和所述标准模拟量电压值，计算出所述模拟量电压值和所述标准模拟量电压值的方差；其中所述模拟量电压值为不同时间点记录的被校直流电流互感器模拟量电压值的数组；所述标准模拟量电压值为不同时间点记录的标准直流比较仪标准模拟量电压值的数组；According to the analog voltage value and the standard analog voltage value, the variance of the analog voltage value and the standard analog voltage value is calculated; wherein the analog voltage value is the calibrated voltage value recorded at different time points. An array of DC current transformer analog voltage values; the standard analog voltage value is an array of standard DC comparator standard analog voltage values recorded at different time points;
根据所述方差计算，评价所述被校直流电流互感器202的精准度。According to the variance calculation, the accuracy of the calibrated DC current transformer 202 is evaluated.
具体评价方法可以根据积分制评价被校直流电流互感器202的精准度，具体操作是将被校直流电流互感器202的精准度的满分设为100分，根据计算出方差值，对精准度进行扣分，最后再由得分值判定被校直流电流互感器202的精准度。The specific evaluation method can evaluate the accuracy of the DC current transformer 202 to be calibrated according to the points system. The specific operation is to set the full score of the accuracy of the DC current transformer 202 to be calibrated to 100 points, and calculate the variance value based on the accuracy. Points are deducted, and finally the accuracy of the DC current transformer 202 to be calibrated is determined based on the score value.
进一步，根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器的精准度，包括：Further, the DC current transformer is calibrated according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and the said DC current transformer is evaluated according to the calibration results. Calibrating the accuracy of DC current transformers, including:
提取所述模拟量电压值的恒流分量，得到直流模拟量电压值；Extract the constant current component of the analog voltage value to obtain the DC analog voltage value;
提取所述标准模拟量电压值的恒流分量，得到直流标准模拟量电压值；Extract the constant current component of the standard analog voltage value to obtain the DC standard analog voltage value;
绘制所述直流模拟量电压值在不同频率下的波形图；Draw waveform diagrams of the DC analog voltage value at different frequencies;
绘制所述标准直流模拟量电压值在不同频率下的波形图；Draw waveform diagrams of the standard DC analog voltage values at different frequencies;
根据所述直流模拟量电压值在不同频率下的波形图与所述标准直流模拟量电压值在不同频率下的波形图的匹配度，评价所述被校直流电流互感器的精准度。The accuracy of the calibrated DC current transformer is evaluated based on the matching degree between the waveform diagrams of the DC analog voltage value at different frequencies and the waveform diagrams of the standard DC analog voltage value at different frequencies.
具体评价方法可以根据积分制评价被校直流电流互感器202的精准度，具体操作是将被校直流电流互感器202的精准度的满分设为100分，根据波形的匹配程度，对精准度进行扣分，最后再由得分值判定被校直流电流互感器202的精准度。The specific evaluation method can evaluate the accuracy of the DC current transformer 202 to be calibrated according to the points system. The specific operation is to set the full score of the accuracy of the DC current transformer 202 to be calibrated to 100 points, and evaluate the accuracy according to the matching degree of the waveform. Points are deducted, and finally the accuracy of the DC current transformer 202 to be calibrated is determined by the score value.
进一步，所述提取所述模拟量电压值的恒流分量为傅氏转化法提取所述模拟量电压值在不同频率下的直流模拟量电压值。Further, the step of extracting the constant current component of the analog voltage value is to extract the DC analog voltage values of the analog voltage value at different frequencies using a Fourier transformation method.
本发明第二方面示出一种直流电流互感器同步校准系统，如图2所示，所述系统包括：The second aspect of the present invention shows a DC current transformer synchronous calibration system, as shown in Figure 2. The system includes:
直流电流源201，所述直流电流源201用于输出恒定电流值；DC current source 201, the DC current source 201 is used to output a constant current value;
被校直流电流互感器202用于输出模拟量电压值；The calibrated DC current transformer 202 is used to output an analog voltage value;
高精度电阻205用于将标准模拟量电压值转化为标准模拟量电流值；High-precision resistor 205 is used to convert standard analog voltage values into standard analog current values;
标准直流比较仪203用于输出标准模拟量电流值和标准模拟量电压值；The standard DC comparator 203 is used to output standard analog current values and standard analog voltage values;
数字信号转换单元204用于将模拟量电流值转化为数字量电流值；The digital signal conversion unit 204 is used to convert the analog current value into a digital current value;
直流电子式互感器校验仪208用于根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器202的精准度。The DC electronic transformer calibrator 208 is used to calibrate the DC current transformer according to the analog voltage value, analog current value, standard analog voltage value, standard analog current value and digital current value. , based on the calibration results, evaluate the accuracy of the calibrated DC current transformer 202.
具体的，标准直流比较仪203的信号是精度校验试验的基准，它取自高精度标准直流电流源201输出的模拟量电压值；经过高精度电阻205标准模拟量电压值转化为标准模拟量电流值，标准模拟量电压值和标准模拟量电压值接至模拟量采集接口单元206。被校直流电流互感器202输出的信号可以为IEC61850-9-1数字量输出式、IEC61850-9-2数字量输出式、FT3数字量输出式等。模拟量电压值信号接至模拟量采集接口单元206另一个输入口。各类数字量电流值，信号经过数字量接口207，利用以太网口接至直流电子式互感器检验仪208。标准直流比较仪203和被校直流电流互感器202的信号在同步信号的控制下进行采集，以避免采样不同步造成的延迟差。同时本发明的系统，能够完成直流电子式电压互感器的比差校验、复合误差、频率测量校验精准度相关测试。同时具备被试品的协议一致性分析、波形绘制、波形分析、报告生成等功能。本系统采用模拟量电压值和数字量电流值进行同步的测量校准，可有效以避免采样分步校准造成的延迟差对被校直流电流互感器202的精准度的影响；同时所述校准方法稳定度高，进而提高了直流电流互感器现场试验的能力。Specifically, the signal of the standard DC comparator 203 is the benchmark for the accuracy calibration test. It is taken from the analog voltage value output by the high-precision standard DC current source 201; the standard analog voltage value is converted into a standard analog quantity by the high-precision resistor 205 The current value, standard analog voltage value and standard analog voltage value are connected to the analog acquisition interface unit 206 . The signal output by the calibrated DC current transformer 202 can be IEC61850-9-1 digital output type, IEC61850-9-2 digital output type, FT3 digital output type, etc. The analog voltage value signal is connected to another input port of the analog acquisition interface unit 206. Various digital current values and signals are connected to the DC electronic transformer tester 208 through the digital interface 207 using the Ethernet port. The signals of the standard DC comparator 203 and the calibrated DC current transformer 202 are collected under the control of the synchronization signal to avoid delay differences caused by asynchronous sampling. At the same time, the system of the present invention can complete the tests related to the ratio difference calibration, composite error, and frequency measurement calibration accuracy of the DC electronic voltage transformer. It also has functions such as protocol consistency analysis, waveform drawing, waveform analysis, and report generation of the test product. This system uses analog voltage values and digital current values for synchronous measurement and calibration, which can effectively avoid the impact of the delay difference caused by sampling step-by-step calibration on the accuracy of the DC current transformer 202 being calibrated; at the same time, the calibration method is stable The accuracy is high, thereby improving the field test capability of DC current transformers.
进一步，所述系统还包括所述系统还包括模拟量采集接口单元206；Further, the system further includes an analog quantity collection interface unit 206;
所述模拟量采集接口单元206用于对模拟量电压值和所述标准模拟量电压值进行采集滤波处理，提取标准直流模拟量电压值和直流模拟量电压值。The analog quantity acquisition interface unit 206 is used to perform acquisition and filtering processing on the analog quantity voltage value and the standard analog quantity voltage value, and extract the standard DC analog quantity voltage value and the DC analog quantity voltage value.
进一步，所述系统还包括数字量接口207；Further, the system also includes a digital interface 207;
所述数字量接口207用于对数字量电流值进行采集滤波处理，提取数字量电流值的恒流分量，得到直流数字量电流值。The digital quantity interface 207 is used to collect and filter the digital quantity current value, extract the constant current component of the digital quantity current value, and obtain the DC digital quantity current value.
进一步，直流电子式互感器校验仪208采用光秒输出法。Furthermore, the DC electronic transformer calibrator 208 adopts the light-second output method.
具体的，校验系统的同步信号采用符合标准的光秒脉冲和IRIG-B输出。本发明实施例为了精确授时，引入光秒脉冲信号上升沿来标示UTC(协调世界时)的整秒时刻，精度可以到纳秒级，而且没有累积误差；IRIG-B：IRIG-B的同步精度可达几十纳秒量级。Specifically, the synchronization signal of the calibration system adopts standard optical second pulse and IRIG-B output. In order to provide accurate timing, the embodiment of the present invention introduces the rising edge of the optical second pulse signal to mark the whole second time of UTC (Coordinated Universal Time). The accuracy can reach nanosecond level and there is no cumulative error; IRIG-B: IRIG-B synchronization accuracy It can reach the order of tens of nanoseconds.
由以上技术方案可知，本发明示出一种直流电流互感器同步校准方法及系统，其中所述方法包括：接收标准直流电流比较仪的标准模拟量电流值和标准模拟量电压值；同时，接受被校直流电流互感器202模拟量电压值和模拟量电流值；获取所述被校直流电流互感器202的数字量电流值；根据所述模拟量电压值，模拟量电流值，标准模拟量电压值，标准模拟量电流值和数字量电流值，对所述直流电流互感器进行校准，根据校准结果，评价所述被校直流电流互感器202的精准度。本方法采用模拟量电压值，模拟量电流值和数字量电流值进行同步的测量校准，利用高稳定度的直流电流源201、高精度标准直流比较仪203，采用精确时间同步方式进行信号采集的标定，确保校准的精准度，不受干扰信号影响可有效避免采样分步校准造成的延迟差对被校直流电流互感器202的精准度的影响；同时所述校准方法稳定度高，进而提高了直流电流互感器现场试验的能力。As can be seen from the above technical solution, the present invention shows a DC current transformer synchronous calibration method and system, wherein the method includes: receiving the standard analog current value and the standard analog voltage value of the standard DC current comparator; at the same time, receiving The analog voltage value and the analog current value of the DC current transformer 202 to be calibrated are obtained; the digital current value of the DC current transformer 202 to be calibrated is obtained; according to the analog voltage value, the analog current value, and the standard analog voltage values, standard analog current values and digital current values, calibrate the DC current transformer, and evaluate the accuracy of the calibrated DC current transformer 202 based on the calibration results. This method uses analog voltage values, analog current values and digital current values for synchronous measurement and calibration. It uses a high-stability DC current source 201 and a high-precision standard DC comparator 203 to collect signals using precise time synchronization. Calibration ensures the accuracy of the calibration and is not affected by interference signals, which can effectively avoid the impact of delay differences caused by sampling step-by-step calibration on the accuracy of the DC current transformer 202 being calibrated; at the same time, the calibration method is highly stable, thereby improving Capability for field testing of DC current transformers.
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本发明的真正范围和精神由下面的权利要求指出。Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary technical means in the technical field that are not disclosed in the invention. . It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。It is to be understood that the present invention is not limited to the precise construction described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
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