CN204241685U - An electric energy meter standard device accuracy remote detection and status monitoring platform - Google Patents
An electric energy meter standard device accuracy remote detection and status monitoring platform Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型属于对电能表标准装置准确性远方检测及状态监测平台结构技术领域。The utility model belongs to the technical field of remote detection of the accuracy of a standard device of an electric energy meter and the structure of a state monitoring platform.
背景技术Background technique
电能表标准装置准确性远方检测及状态监测技术的研究及监测平台的建立，可有效实现电网各级计量中心电能表标准装置的远方实施监测，改变现有电能标准装置定期送检及维护现状及不足，促进电网电能计量管控水平。The research on the accuracy remote detection and status monitoring technology of standard devices of electric energy meters and the establishment of a monitoring platform can effectively realize the remote monitoring of standard devices of electric energy meters in metering centers at all levels of the power grid, and change the current situation of regular inspection and maintenance of existing standard devices for electric energy. Insufficient, to promote the level of grid power metering control.
通过电能表标准装置准确性远方检测及状态监测技术研究，建立电能表标准装置准确性远方检测及状态监测平台，并选择云南电网昆明供电局计量中心进行试验测试，在试验测试成功的基础上，将成果进行推广至云南电网公司各级计量中心，建立云南电网统一的电能表标准装置远方监测平台。Through the research on the accuracy remote detection and state monitoring technology of the standard device of electric energy meters, the remote detection and state monitoring platform for the standard device accuracy of electric energy meters was established, and the measurement center of Kunming Power Supply Bureau of Yunnan Power Grid was selected for the test test. On the basis of the successful test, Promote the results to all levels of metering centers of Yunnan Power Grid Corporation, and establish a unified remote monitoring platform for electric energy meter standard devices in Yunnan Power Grid.
研究成果推广至云南电网公司各级计量中心后可有效对电能表标准装置的稳定性进行实时监控，并间接减少由于电能表标准装置检定过程中的偏移造成的检定结果偏差，带来的经济损失。After the research results are extended to the metering centers at all levels of Yunnan Power Grid Corporation, it can effectively monitor the stability of the standard device of the electric energy meter in real time, and indirectly reduce the deviation of the verification result caused by the deviation of the standard device of the electric energy meter during the verification process, bringing economic benefits loss.
发明内容Contents of the invention
一种电能表标准装置准确性远方检测及状态监测平台，能够对电能表标准装置准确性进行远方检测及状态监测，本实用新型特征包括以下内容：A platform for remote detection and status monitoring of the accuracy of the standard device of an electric energy meter, capable of performing remote detection and status monitoring of the accuracy of the standard device of an electric energy meter. The features of the utility model include the following:
一种电能表标准装置准确性远方检测及状态监测平台，本实用新型特征在于，该平台由0.01级电能基准装置和一个以上并联连接的0.05级监测系统及装置并联连接构成；0.05级监测系统及装置、0.01级电能基准装置分别采用交换机通过有线或无线或光纤与显示服务器连接；其中：A remote detection and status monitoring platform for the accuracy of a standard device of an electric energy meter. The utility model is characterized in that the platform is composed of a 0.01-level electric energy reference device and more than one 0.05-level monitoring system and devices connected in parallel; the 0.05-level monitoring system and The device and the 0.01-level electric energy reference device are respectively connected to the display server through a switch through wired or wireless or optical fiber; among them:
0.05级监测系统及装置由电压采样器、电流采样器、三相合并单元组成，检验台的标准电能表通过电能脉冲与三相合并单元连接，对所述检验台的标准电能表的输出信号进行测量并对其进行记录；设有标准电能表检定装置分别与电压采样单元、电流采样单元、检验台的标准电能表连接；标准电能表检定装置还通过状态数据与交换机连接；The 0.05-level monitoring system and device are composed of a voltage sampler, a current sampler, and a three-phase merging unit. The standard electric energy meter of the inspection station is connected to the three-phase merging unit through electric energy pulses, and the output signal of the standard electric energy meter of the inspection station is monitored. Measure and record it; there is a standard electric energy meter verification device connected to the voltage sampling unit, current sampling unit, and standard electric energy meter of the inspection platform; the standard electric energy meter verification device is also connected to the switch through the state data;
0.01级电能基准装置由电压采样器、电流采样器分别连接数据处理及误差显示单元组成；本实用新型通过与电能表标准装置进行通讯，规约解析实时实现对被检电能表检测项目的监测、统计、查询、分析，掌控大批量被检电能表质量优劣情况。The 0.01-level electric energy reference device is composed of a voltage sampler and a current sampler respectively connected to data processing and error display units; the utility model communicates with the standard device of the electric energy meter, and the protocol analysis realizes the monitoring and statistics of the detection items of the electric energy meter under inspection in real time , query, analysis, and control the quality of a large number of inspected electric energy meters.
采用主站系统远程下发电能表标准装置比对方案、电能表检定方案到每台电能表标准装置，并通过0.05级监测系统及装置、0.01级电能基准装置采集和反馈比对与检定数据回主站系统，实现实验室间能力比对、标准装置期间核查。Use the master station system to remotely download the comparison plan of the standard device of the electric energy meter and the verification plan of the electric energy meter to each standard device of the electric energy meter, and collect and feedback the comparison and verification data through the 0.05 level monitoring system and device, and the 0.01 level electric energy reference device The main station system realizes the ability comparison between laboratories and the verification of standard equipment.
①电压采样单元前端采用精密仪用电压互感器，将480V电压直接转换成便于数据采集模块的A/D采集4V电压，该电压互感器采用无源的双级电压互感器设计，有较高的输入阻抗，在并接于电能表校验装置输出上时基本不增加装置的负载，U/U变换器采用模块化设计，便于上一层的量值传递；①The front end of the voltage sampling unit adopts a voltage transformer for precision instruments, which directly converts the 480V voltage into a 4V voltage for the A/D acquisition of the data acquisition module. The input impedance basically does not increase the load of the device when it is connected to the output of the electric energy meter calibration device in parallel. The U/U converter adopts a modular design, which is convenient for the value transfer of the upper layer;
②电流采样前端使用0.01级穿心式设计100A/80mA双级电流互感器，互感器二次输出固定接入进口四端采样电阻，使其不增加、不改变运行中的校验装置电流回路的负载，从而保证既能快速响应信号的变化又能不影响被监测电能表标准装置的运行；② The front end of the current sampling uses a 0.01-level through-type design 100A/80mA double-level current transformer, and the secondary output of the transformer is fixedly connected to the imported four-terminal sampling resistor, so that it does not increase or change the current loop of the calibration device in operation. Load, so as to ensure that it can quickly respond to the change of the signal without affecting the operation of the standard device of the monitored electric energy meter;
③在电流采集模块中采用STM32的CORTEX-M3系列高性能低功耗单片机对当前信号大小进行实时的监测。当采样点数据小于当前量程的8％时，通过增加仪用放大器的增益使放大器输出信号尽可能的接近18位ADC的量程，提高测量精度；而当采样点数据超出当前量程的95％时，通过降低仪用放大器的增益使信号不超出量程范围，保证监测数据的准确性。③In the current acquisition module, the STM32 CORTEX-M3 series high-performance and low-power single-chip microcomputer is used to monitor the current signal size in real time. When the sampling point data is less than 8% of the current range, increase the gain of the instrument amplifier to make the output signal of the amplifier as close as possible to the range of the 18-bit ADC to improve the measurement accuracy; and when the sampling point data exceeds 95% of the current range, By reducing the gain of the instrumentation amplifier, the signal does not exceed the range of the measurement range, so as to ensure the accuracy of the monitoring data.
0.01级电能基准装置由电压电流采样单元、数据处理及误差显示单元组成。主要用于对0.05级监测系统的期间核查：The 0.01-level electric energy reference device is composed of a voltage and current sampling unit, a data processing unit and an error display unit. It is mainly used for period verification of the 0.05-level monitoring system:
①0.01级电能基准内部的前端结构与监测装置类似，都是通过FPGA模块控制采集模块接收采集数据。但与监测装置不同，电能基准需要整机送上一级检定，所以需要0.01级在内部增加运算单元；① The internal front-end structure of the 0.01-level electric energy reference is similar to the monitoring device, and the acquisition module is controlled by the FPGA module to receive the collected data. However, unlike the monitoring device, the electric energy reference needs to be sent to the first-level verification of the whole machine, so a 0.01-level computing unit is required to be added inside;
②0.01级电能基准装置的电压采样通道前端采用的精密仪用电压互感器可以通过小信号继电器在互感器二次进行400V、200V、100V和50V的量程切换，保证在上述档位输入满量程信号时，二次输出信号为4V信号；②The precision instrument voltage transformer used at the front end of the voltage sampling channel of the 0.01-level electric energy reference device can switch the range of 400V, 200V, 100V and 50V for the second time through the small signal relay to ensure that the full range is input in the above gear signal, the secondary output signal is a 4V signal;
③0.01级电能基准装置的电流采样通道前端采用双级电流互感器，其一次回路有100A、10A、1A三个电流档位，通过一次继电器切换，使得二次回路电流在8～80mA范围。③The front end of the current sampling channel of the 0.01-level electric energy reference device adopts a double-stage current transformer, and its primary circuit has three current levels of 100A, 10A, and 1A. It is switched by a primary relay to make the secondary circuit current in the range of 8-80mA.
0.01级基准装置和各个0.05级监测装置均作为采样Socket服务端，服务器端的多通道运算客户端从采样服务端获取采样数据并计算出电压、电流、功率值，电能表标准装置的PC机中通过规约转换软件连接服务器端的状态监测软件和PC机中的校表软件进行通讯。The 0.01-level reference device and each 0.05-level monitoring device are used as the sampling socket server. The multi-channel calculation client on the server side obtains the sampling data from the sampling server and calculates the voltage, current, and power values. The protocol conversion software communicates with the status monitoring software on the server side and the meter calibration software in the PC.
本实用新型的有益效果是，The beneficial effects of the utility model are:
1)远程实时地对多个片区的每台电能表标准装置的运行状态进行掌控；1) Remotely and in real time control the operating status of each standard device of electric energy meters in multiple areas;
2)实时在线地对电能表标准装置的准确性进行监测；2) Monitor the accuracy of the standard device of the electric energy meter in real time and online;
3)远程实时地对多个片区的每台电能表标准装置检定/检测的电能表的误差、多功能测试项目进行监测、统计、查询、分析，掌控大批量被检电能表质量优劣情况。3) Remotely monitor, count, inquire and analyze the error and multi-function test items of each energy meter standard device verification/detection in multiple areas in real time, and control the quality of a large number of inspected energy meters.
4)主站系统远程下发电能表标准装置比对方案、电能表检定方案到每台电能表标准装置；4) The master station system remotely downloads the energy meter standard device comparison plan and the electric energy meter verification plan to each electric energy meter standard device;
5)实现对不同厂家、型号的电能表标准装置性能的评估；5) Realize the evaluation of the performance of the standard device of electric energy meters of different manufacturers and models;
6)实现对不同厂家、型号的安装式电能表、标准电能表性能的评估。6) Realize the evaluation of the performance of installed electric energy meters and standard electric energy meters of different manufacturers and models.
附图说明Description of drawings
图1为本实用新型整体系统运行框图；Fig. 1 is the block diagram of overall system operation of the present utility model;
图2为本实用新型0.05级监测系统运行原理图；Fig. 2 is the operating schematic diagram of the 0.05 level monitoring system of the present invention;
图3为本实用新型0.05级监测装置电压采样方式原理图；Fig. 3 is the principle diagram of the voltage sampling method of the 0.05 level monitoring device of the present invention;
图4为本实用新型0.05级监测装置电流采样方式原理图；Fig. 4 is the principle diagram of the current sampling mode of the 0.05 level monitoring device of the present invention;
图5为本实用新型0.05级监测装置采样电路原理图；Fig. 5 is the schematic diagram of the sampling circuit of the 0.05 level monitoring device of the present invention;
图6为本实用新型0.05级监测装置安装方式图；Fig. 6 is a diagram of the installation method of the 0.05 level monitoring device of the present invention;
图7为本实用新型0.01级电能基准装置原理图；Fig. 7 is the principle diagram of the 0.01 level electric energy reference device of the utility model;
图8为本实用新型0.01级电能基准装置整体原理图；Fig. 8 is the overall schematic diagram of the 0.01-level electric energy reference device of the present invention;
图9为本实用新型0.01级电能基准装置电压采样方式原理图；Fig. 9 is a schematic diagram of the voltage sampling method of the 0.01-level electric energy reference device of the present invention;
图10为本实用新型0.01级电能基准装置电流采样方式原理图；Fig. 10 is a schematic diagram of the current sampling method of the 0.01-level electric energy reference device of the present invention;
图11为本实用新型0.01级电能基准装置安装方式图。Figure 11 is a diagram of the installation method of the 0.01-level electric energy reference device of the utility model.
图1中：ΔE电能误差，3X表示三相电路。In Figure 1: ΔE electric energy error, 3X represents a three-phase circuit.
具体实施方式Detailed ways
如图1所示，一种电能表标准装置准确性远方检测及状态监测平台，其特征在于，该平台由0.01级电能基准装置2和一个以上并联连接的0.05级监测系统及装置1并联连接构成；0.05级监测系统及装置1、0.01级电能基准装置2分别采用交换机通过有线或无线或光纤与显示服务器连接；其中：As shown in Figure 1, a remote detection and status monitoring platform for the accuracy of the standard device of an electric energy meter is characterized in that the platform is composed of a 0.01-level electric energy reference device 2 and more than one 0.05-level monitoring system and device 1 connected in parallel. ; The 0.05-level monitoring system and device 1, and the 0.01-level electric energy reference device 2 respectively use switches to connect to the display server through wired or wireless or optical fiber; where:
0.05级监测系统及装置1由电压采样器、电流采样器、三相合并单元组成，检验台的标准电能表通过电能脉冲与三相合并单元连接，对所述检验台的标准电能表的输出信号进行测量并对其进行记录；设有标准电能表检定装置分别与电压采样单元、电流采样单元、检验台的标准电能表连接；标准电能表检定装置还通过状态数据与交换机连接；The 0.05-level monitoring system and device 1 are composed of a voltage sampler, a current sampler, and a three-phase merging unit. The standard electric energy meter of the inspection station is connected to the three-phase merging unit through electric energy pulses, and the output signal of the standard electric energy meter of the inspection station is Carry out measurement and record it; there is a standard electric energy meter verification device connected to the standard electric energy meter of the voltage sampling unit, current sampling unit, and inspection platform; the standard electric energy meter verification device is also connected to the switch through the state data;
0.01级电能基准装置2由电压采样器、电流采样器分别连接数据处理及误差显示单元组成；本实用新型通过与电能表标准装置进行通讯，规约解析实时实现对被检电能表检测项目的监测、统计、查询、分析，掌控大批量被检电能表质量优劣情况。The 0.01-level electric energy reference device 2 is composed of a voltage sampler and a current sampler respectively connected to a data processing and error display unit; the utility model communicates with the standard device of the electric energy meter, and realizes real-time monitoring of the detection items of the electric energy meter under inspection by protocol analysis. Statistics, query, analysis, and control of the quality of a large number of inspected electric energy meters.
采用主站系统远程下发电能表标准装置比对方案、电能表检定方案到每台电能表标准装置，并通过0.05级监测系统及装置1、0.01级电能基准装置2采集和反馈比对与检定数据回主站系统，实现实验室间能力比对、标准装置期间核查。Use the master station system to remotely download the energy meter standard device comparison plan and the electric energy meter verification plan to each electric energy meter standard device, and pass the 0.05-level monitoring system and device 1, 0.01-level electric energy reference device 2 collection and feedback comparison and verification The data is returned to the main station system to realize the ability comparison between laboratories and the verification during the standard device period.
①电压采样单元前端采用精密仪用电压互感器，将480V电压直接转换成便于数据采集模块的A/D采集4V电压，该电压互感器采用无源的双级电压互感器设计，有较高的输入阻抗，在并接于电能表校验装置输出上时基本不增加装置的负载，U/U变换器采用模块化设计，便于上一层的量值传递；①The front end of the voltage sampling unit adopts a voltage transformer for precision instruments, which directly converts the 480V voltage into a 4V voltage for the A/D acquisition of the data acquisition module. The input impedance basically does not increase the load of the device when it is connected to the output of the electric energy meter calibration device in parallel. The U/U converter adopts a modular design, which is convenient for the value transfer of the upper layer;
②电流采样前端使用0.01级穿心式设计100A/80mA双级电流互感器，互感器二次输出固定接入进口四端采样电阻，使其不增加、不改变运行中的校验装置电流回路的负载，从而保证既能快速响应信号的变化又能不影响被监测电能表标准装置的运行；② The front end of the current sampling uses a 0.01-level through-type design 100A/80mA double-level current transformer, and the secondary output of the transformer is fixedly connected to the imported four-terminal sampling resistor, so that it does not increase or change the current loop of the calibration device in operation. Load, so as to ensure that it can quickly respond to the change of the signal without affecting the operation of the standard device of the monitored electric energy meter;
③在电流采集模块中采用STM32的CORTEX-M3系列高性能低功耗单片机对当前信号大小进行实时的监测。当采样点数据小于当前量程的8％时，通过增加仪用放大器的增益使放大器输出信号尽可能的接近18位ADC的量程，提高测量精度；而当采样点数据超出当前量程的95％时，通过降低仪用放大器的增益使信号不超出量程范围，保证监测数据的准确性。③In the current acquisition module, the STM32 CORTEX-M3 series high-performance and low-power single-chip microcomputer is used to monitor the current signal size in real time. When the sampling point data is less than 8% of the current range, increase the gain of the instrument amplifier to make the output signal of the amplifier as close as possible to the range of the 18-bit ADC to improve the measurement accuracy; and when the sampling point data exceeds 95% of the current range, By reducing the gain of the instrumentation amplifier, the signal does not exceed the range of the measurement range, so as to ensure the accuracy of the monitoring data.
0.01级电能基准装置由电压电流采样单元、数据处理及误差显示单元组成。主要用于对0.05级监测系统的期间核查：The 0.01-level electric energy reference device is composed of a voltage and current sampling unit, a data processing unit and an error display unit. It is mainly used for period verification of the 0.05-level monitoring system:
①0.01级电能基准内部的前端结构与监测装置类似，都是通过FPGA模块控制采集模块接收采集数据。但与监测装置不同，电能基准需要整机送上一级检定，所以需要0.01级在内部增加运算单元；① The internal front-end structure of the 0.01-level electric energy reference is similar to the monitoring device, and the acquisition module is controlled by the FPGA module to receive the collected data. However, unlike the monitoring device, the electric energy reference needs to be sent to the first-level verification of the whole machine, so a 0.01-level computing unit is required to be added inside;
②0.01级电能基准装置的电压采样通道前端采用的精密仪用电压互感器可以通过小信号继电器在互感器二次进行400V、200V、100V和50V的量程切换，保证在上述档位输入满量程信号时，二次输出信号为4V信号；②The precision instrument voltage transformer used at the front end of the voltage sampling channel of the 0.01-level electric energy reference device can switch the range of 400V, 200V, 100V and 50V for the second time through the small signal relay to ensure that the full range is input in the above gear signal, the secondary output signal is a 4V signal;
③0.01级电能基准装置的电流采样通道前端采用双级电流互感器，其一次回路有100A、10A、1A三个电流档位，通过一次继电器切换，使得二次回路电流在8～80mA范围。③The front end of the current sampling channel of the 0.01-level electric energy reference device adopts a double-stage current transformer, and its primary circuit has three current levels of 100A, 10A, and 1A. It is switched by a primary relay to make the secondary circuit current in the range of 8-80mA.
0.01级基准装置和各个0.05级监测装置均作为采样Socket服务端，服务器端的多通道运算客户端从采样服务端获取采样数据并计算出电压、电流、功率值，电能表标准装置的PC机中通过规约转换软件连接服务器端的状态监测软件和PC机中的校表软件进行通讯。The 0.01-level reference device and each 0.05-level monitoring device are used as the sampling socket server. The multi-channel calculation client on the server side obtains the sampling data from the sampling server and calculates the voltage, current, and power values. The protocol conversion software communicates with the status monitoring software on the server side and the meter calibration software in the PC.
电能表标准检定装置和标准电能表是实验室现有的设备，作为被监测的对象；0.05级监测系统用于实时在线对电能表标准检定装置的准确性进行监测。0.01级电能基准装置用于对0.05级监测系统的期间核查。0.01级电能基准装置和各个0.05级监测装置以及对应的电能表标准装置的PC机通过交换机与现场服务器连接。0.01电能基准装置和各个0.05级监测装置均作为采样Socket服务端，服务器端的多通道运算客户端从采样服务端获取采样数据并计算出电压、电流、功率值，电能表标准装置的PC机中通过规约转换软件连接服务器端的状态监测软件和PC机中的校表软件进行通讯。远方监测平台选用Visual Studio.net 2010的C#作为系统软件开发平台，主站系统实现对多个片区每张电能表标准装置准确性远方检测及状态监测。The standard verification device of the electric energy meter and the standard electric energy meter are the existing equipment in the laboratory, as the objects to be monitored; the 0.05 level monitoring system is used to monitor the accuracy of the standard verification device of the electric energy meter online in real time. The 0.01-level electric energy reference device is used for the period verification of the 0.05-level monitoring system. The 0.01-level electric energy reference device, each 0.05-level monitoring device and the PC of the corresponding electric energy meter standard device are connected to the on-site server through a switch. The 0.01 electric energy reference device and each 0.05-level monitoring device are used as the sampling socket server. The multi-channel calculation client on the server side obtains the sampling data from the sampling server and calculates the voltage, current, and power values. The PC of the standard device of the electric energy meter passes The protocol conversion software communicates with the status monitoring software on the server side and the meter calibration software in the PC. The remote monitoring platform uses C# of Visual Studio.net 2010 as the system software development platform, and the master station system realizes the remote detection and status monitoring of the accuracy of each standard device of electric energy meters in multiple areas.
如图2所示，本0.05级监测系统由电压电流采样单元、三相合并单元组成，通过对校验台的输出信号进行测量并对校验台的标准表电能脉冲进行记录，以及后方服务器的集中数据分析处理，实现实时在线对电能表标准装置的准确性进行监测。As shown in Figure 2, this 0.05-level monitoring system is composed of a voltage and current sampling unit and a three-phase merging unit. By measuring the output signal of the calibration platform and recording the standard meter electric energy pulse of the calibration platform, and the rear server’s Centralized data analysis and processing to realize real-time online monitoring of the accuracy of the standard device of the electric energy meter.
如图3所示，前端采用精密仪用电压互感器，将480V电压直接转换成便于数据采集模块的A/D采集4V电压，该电压互感器采用无源的双级电压互感器设计，有较高的输入阻抗，在并接于电能表校验装置输出上时基本不增加装置的负载，U/U变换器采用模块化设计，便于上一层的量值传递。As shown in Figure 3, the front end uses a voltage transformer for precision instrumentation to directly convert the 480V voltage into a 4V voltage that is convenient for the A/D of the data acquisition module to collect. The high input impedance basically does not increase the load of the device when it is connected to the output of the electric energy meter calibration device in parallel. The U/U converter adopts a modular design, which is convenient for the value transfer of the upper layer.
如图4所示，电流采样前端使用0.01级穿心式设计100A/80mA双级电流互感器，互感器二次输出固定接入进口四端采样电阻，使其不增加、不改变运行中的校验装置电流回路的负载，从而保证既能快速响应信号的变化又能不影响被监测电能表标准装置的运行。但这样的恒定负载方式往往会使得小电流时精度下降较大，为此在四端采样电阻和补偿电路将电流转为电压后，通过可以高速切换增益、动态范围1000：1的程控增益仪用放大器对电压信号进行放大，使得输出信号在设计的100A～1A范围内维持在0.4～4伏之间，保证后面18位高速AD进行模数转换的准确性。As shown in Figure 4, the front-end of the current sampling uses a 0.01-level through-type design 100A/80mA double-level current transformer, and the secondary output of the transformer is fixedly connected to the imported four-terminal sampling resistor, so that it does not increase or change the calibration during operation. The load of the current loop of the test device can be ensured to respond quickly to the change of the signal without affecting the operation of the standard device of the monitored electric energy meter. However, such a constant load method will often cause a large drop in accuracy when the current is small. For this reason, after the four-terminal sampling resistor and the compensation circuit convert the current into a voltage, the gain can be switched at high speed and the dynamic range is 1000:1. The amplifier amplifies the voltage signal, so that the output signal is maintained between 0.4 and 4 volts within the designed range of 100A to 1A, ensuring the accuracy of the analog-to-digital conversion of the following 18-bit high-speed AD.
如图5所示，为了尽可能地在最佳的量程范围内对信号进行采样，以及适应负荷的变动，采用图5所示的采样系统对U/U、I/U变换输出的小电压信号进行采样。在电流采集模块中采用STM32的CORTEX-M3系列高性能低功耗单片机对当前信号大小进行实时的监测。当采样点数据小于当前量程的8％时，通过增加仪用放大器的增益使放大器输出信号尽可能的接近18位ADC的量程，提高测量精度；而当采样点数据超出当前量程的95％时，通过降低仪用放大器的增益使信号不超出量程范围，保证监测数据的准确性。As shown in Figure 5, in order to sample the signal within the best range as much as possible and to adapt to the change of the load, the sampling system shown in Figure 5 is used to convert the small voltage signal output by U/U and I/U Take a sample. In the current acquisition module, the STM32 CORTEX-M3 series high-performance and low-power single-chip microcomputer is used to monitor the current signal size in real time. When the sampling point data is less than 8% of the current range, increase the gain of the instrument amplifier to make the output signal of the amplifier as close as possible to the range of the 18-bit ADC to improve the measurement accuracy; and when the sampling point data exceeds 95% of the current range, By reducing the gain of the instrumentation amplifier, the signal does not exceed the range of the measurement range, so as to ensure the accuracy of the monitoring data.
如图6所示，监测装置安放在电能表标准装置的机柜顶端，与电能表标准装置中的标准表实行电压并接、电流串接，通过T型BNC将标准表的脉冲输出分成两路其中一路接到监测装置的脉冲输入端。监测装置端的光纤接口为SC接口，采用单模2芯光纤布线。安装完毕后对监测装置设定固定IP地址、电能表标准装置的编号以及输入对当前电能表标准装置的备注信息，然后监测装置便会将当前采集的信息发送到后台服务器。As shown in Figure 6, the monitoring device is placed on the top of the cabinet of the standard device of the electric energy meter, and the standard meter in the standard device of the electric energy meter is connected in parallel with the voltage and connected in series with the current, and the pulse output of the standard meter is divided into two channels through a T-shaped BNC. All the way to the pulse input terminal of the monitoring device. The optical fiber interface at the monitoring device end is an SC interface, using single-mode 2-core optical fiber wiring. After the installation is complete, set a fixed IP address for the monitoring device, the number of the standard device of the electric energy meter, and input the remark information for the standard device of the current electric energy meter, and then the monitoring device will send the currently collected information to the background server.
如图7所示，0.01级电能基准装置由电压电流采样单元、数据处理及误差显示单元组成。主要用于对0.05级监测系统的期间核查。As shown in Figure 7, the 0.01-level electric energy reference device is composed of a voltage and current sampling unit, data processing and error display unit. It is mainly used for period verification of the 0.05-level monitoring system.
如图8所示，电能基准内部的前端结构与监测装置类似，都是通过FPGA模块控制采集模块接收采集数据。但与监测装置不同，电能基准需要整机送上一级检定，所以需要在内部增加运算单元。经过研究决定使用低功耗工控机作为数据运算处理单元，同时通过电能基准的液晶屏显示，使得操作人员更直观地看到当前的状态、比对信息。As shown in Figure 8, the internal front-end structure of the power reference is similar to the monitoring device, and the acquisition module is controlled by the FPGA module to receive the collected data. However, unlike the monitoring device, the electric energy reference needs to be sent to the first-level verification of the whole machine, so it is necessary to add a computing unit inside. After research, it was decided to use a low-power industrial computer as the data processing unit, and at the same time, through the LCD screen display of the power reference, the operator can see the current status and comparison information more intuitively.
如图9所示，0.01级电能基准装置的电压采样通道前端采用的精密仪用电压互感器可以通过小信号继电器在互感器二次进行进行400V、200V、100V和50V的量程切换，保证在上述档位输入满量程信号时，二次输出信号为4V信号。后面的模数变换硬件部分与监测装置一致，采用高精度高采样率A/D对互感器二次信号进行采集，为了进一步降低最终数据的不确定度，在电能基准装置中采用更高的采样率，通过更高的过采样率提高数据的准确度。As shown in Figure 9, the precision instrument voltage transformer used at the front end of the voltage sampling channel of the 0.01-level electric energy reference device can switch the ranges of 400V, 200V, 100V and 50V in the transformer secondary through the small signal relay, ensuring that the above-mentioned When the gear input full-scale signal, the secondary output signal is 4V signal. The following analog-to-digital conversion hardware part is consistent with the monitoring device, using A/D with high precision and high sampling rate to collect the secondary signal of the transformer. In order to further reduce the uncertainty of the final data, a higher sampling rate is used in the power reference device. Rate, improve data accuracy through higher oversampling rate.
如图10所示，0.01级电能基准装置的电流采样通道前端采用双级电流互感器，其一次回路有100A、10A、1A三个电流档位，通过一次继电器切换，使得二次回路电流在8～80mA范围。档位切换采用程控手动和自动换档方式，前者适合于送检时的稳态信号比对，后者适合于与0.05级监测装置并联运行对监测装置各个量程点的长期稳定性的核查。As shown in Figure 10, the front end of the current sampling channel of the 0.01-level electric energy reference device adopts a double-stage current transformer, and its primary circuit has three current levels of 100A, 10A, and 1A. ~80mA range. Gear shifting adopts program-controlled manual and automatic gear shifting. The former is suitable for steady-state signal comparison during inspection, and the latter is suitable for parallel operation with 0.05-level monitoring devices to check the long-term stability of each range point of the monitoring device.
如图11所示，0.01级电能基准装置通过仪表推车，放到需要进行期间核查的监测装置旁，与监测装置中的标准表实行电压并接、电流串接，将监测装置的脉冲输出接到基准装置的脉冲输入端。基准装置端的光纤接口为SC接口，采用单模2芯光纤布线。As shown in Figure 11, the 0.01-level electric energy reference device is placed next to the monitoring device that needs to be checked during the period through the instrument cart, and is connected to the standard meter in the monitoring device in parallel with the voltage and in series with the current, and the pulse output of the monitoring device is connected to the to the pulse input of the reference device. The optical fiber interface at the reference device end is an SC interface, and single-mode 2-core optical fiber wiring is used.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105487040A (en) * | 2015-12-22 | 2016-04-13 | 云南电网有限责任公司电力科学研究院 | Standard electric energy meter and data processing method thereof |
| CN105866727A (en) * | 2016-06-13 | 2016-08-17 | 国网江苏省电力公司电力科学研究院 | Real-time checking system for electric energy meter calibrating device |
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| CN105487040B (en) * | 2015-12-22 | 2018-05-15 | 云南电网有限责任公司电力科学研究院 | A kind of standard electric energy meter and its data processing method |
| CN105866727A (en) * | 2016-06-13 | 2016-08-17 | 国网江苏省电力公司电力科学研究院 | Real-time checking system for electric energy meter calibrating device |
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| CN111896910A (en) * | 2020-07-30 | 2020-11-06 | 贵州电网有限责任公司 | Pluggable metering data comparison method and system based on metering equipment |
| CN114089261A (en) * | 2021-11-16 | 2022-02-25 | 宁波迦南智能电气股份有限公司 | Performance evaluation method of inspection device based on inspection records of electric energy meter |
| CN114089261B (en) * | 2021-11-16 | 2024-04-09 | 宁波迦南智能电气股份有限公司 | Performance evaluation method of inspection device based on electric energy meter inspection record |
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