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　　 Description
　　 The invention relates to the field of electric energy meter measurement and testing, in particular to a novel analog standard table and a detection method with digital electric energy meter detection function.
　　 Background of the invention
　　 With the advent of the IEC61850 intelligent substation digital standard and the development of corresponding technologies, digital and networked energy meters were born. Therefore, how to establish its testing specifications, how to detect digital energy meters, how to trace the source of its detection standards, etc. has become a concern of the majority of metrology personnel. However, the energy meter detection standard/device belongs to the analog field. There is no corresponding standard for digital energy meter, and there are difficult problems in technology and meter traceability. Therefore, vertical metering and traceability of digital energy meter cannot be realized.
　　 In the prior art, at present, for the digital electric energy meter detection, only the "table-to-table" comparison mode of the same type table can be used. The so-called standard digital electric energy meter is also self-talking, and its standard is difficult to effectively verify, so the result of the comparison Lack of scientific and legal effectiveness.
　　 Patent CN201607526 discloses a device for testing a digital electric energy meter to realize digital power source output, using a standard pulse plate as a standard comparison, and still using a "table-to-table" comparison mode, whose standardity is difficult to effectively verify. Patent CN103048638 discloses a multi-function testing device for electric energy digital signal, comprising a digital power source and a pulse unit, which realizes digital signal transmission output, detects standard value calculation of externally connected detected signal source, but does not have real-time signal source function. And analog power sources.
　　 The analog electric energy meter measurement and detection system is a very mature and standardized system. If the digital energy meter can be realized by the analog measurement system, it can realize one standard and two use, save measurement cost and realize digital electric energy meter detection.
　　 Summary of the invention
　　 In order to solve the prior art problem and implement a digital electric energy meter analog standard detecting method, the present invention provides a novel analog standard meter and a detecting method with a digital electric energy meter detecting function.
　　 The technical scheme of the invention is: a new analog standard table with digital electric energy meter detection function, including A/D analog-to-digital converter, DSP unit, IEC61850 data modulator, IEC61850/FT3 data demodulator, error calculator. More preferably, it also includes a display and human-computer interaction unit, a microprocessor and an interface unit for controlling the display and human-computer interaction unit. 
　　 A/D analog-to-digital converter and DSP unit are connected for analog/standard traceability of analog energy meter; A/D analog-to-digital converter is connected with IEC61850 data modulator for offline detection of digital energy meter; IEC61850/FT3 solution The modulator is connected to the DSP unit for on-site digital energy meter online verification comparison, electronic mutual inductance test and DSP calculation function verification. Through the IEC61850 input / output port, energy pulse input / output port, analog signal channel can form a metering traceability / transmission, verification system, complete the standard table traceability system / value transfer network system.
　　 The DSP unit includes a signal analysis module, an electrical parameter calculation module and a power calculation module, the signal analysis module, the electrical parameter calculation module and the energy calculation module are connected; the A/D analog-to-digital converter, the IEC61850 data modulator, and the IEC61850/FT3 data demodulation The device is connected to the signal analysis module, the error calculator is connected to the energy calculation module, and the electrical parameter calculation module and the energy calculation module are connected to the microprocessor. Through the signal analysis of the DSP unit and the IEC61850/FT3 data demodulator, the digital output electronic transformer verification function can be realized. At the same time, the DSP unit and the display and human-machine interaction unit realize the three-phase electrical parameter voltage, current, frequency, phase, Parameter measurement and synchronous display function such as power.
　　 A/D analog-to-digital converter, IEC61850 data modulator, IEC61850 data demodulator and DSP unit are connected by data bus, and the data transmission speed is fast. Preferably, the display and human-computer interaction unit, the interface unit and the microprocessor are connected by a data bus, and the DSP unit and the microprocessor are connected by a data bus. The A/D analog-to-digital converter is 6 channels, which respectively receive three-phase voltage and three-phase current analog signals, and realize three-phase voltage and current analog signal input interfaces.
　　 The interface unit includes a USB interface, an RS232 interface, and an Ethernet interface. The USB interface, the RS232 interface, and the Ethernet interface are all connected to the microprocessor. Through the interface unit, the present invention can perform data transmission with the external device. The display and human-computer interaction unit includes a display screen, a button, a keyboard and a mouse to facilitate the detection of the digital energy meter.
　　 A new analog standard meter with digital electric energy meter detection function can realize the following steps: analog electric energy meter calibration/standard traceability; digital electric energy meter offline detection; analog electric energy meter and digital electric energy meter synchronous verification.
　　 The invention also includes online detection of digital electric energy meter: the field merging unit sends the voltage and current data message to the IEC 61850/FT3 data demodulator and the online digital electric energy meter, and the IEC 61850/FT3 data demodulator receives the IEC 61850 message, and restores the The original signal sample value, the original signal sample value is converted into a pulse signal by the DSP unit, and then sent to the error calculator, and the online digitized energy meter receives the voltage and current data message sent by the field merging unit. The metered electric energy pulse signal is sent to the error calculator, and the error calculator compares the pulse signal outputted by the online digitized electric energy meter with the pulse signal output by the DSP unit described in this step to perform electric energy error calculation.
　　 The invention also includes the DSP unit metering performance verification, the virtual standard source sends the IEC61850/FT3 message to the IEC61850/FT3 data demodulator, and the IEC61850/FT3 data demodulator receives the IEC61850/FT3 message to restore the original signal sample value. The raw signal sample value is measured by the DSP unit and the corresponding power pulse is sent to the error calculator, and the virtual standard source outputs a standard power pulse to the error calculator, and the error calculator compares the energy pulse measured by the DSP unit with The standard power pulse of the virtual standard source verifies the accuracy of the DSP unit energy calculation module.
　　 The beneficial effects of the invention include: having standard analog and digital electric energy meter functions, realizing synchronous verification of analog electric energy meter and digital electric energy meter, detecting digital electric energy meter by analog standard table measuring method, breaking the mutual comparison of digital electric energy meter The method is scientific and reasonable, and the reliability and accuracy are relatively high.
　　 Further, the present invention can both verify the electric energy meter offline and verify the electric energy meter online, and can be widely used in the laboratory and the on-site environment. In addition, the invention not only satisfies the requirements of traceability measurement management but also avoids the problem of setting digital standards, and completely adopts the analog standard table traceability/transfer mode, which is an optimized technical solution, and the internal DSP is greatly simplified as a common standard of analog and digital. System structure, minimum hardware and lowest cost.
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New analog standard table for digital energy meter detection
　　 Today, we introduce a national invention patent for authorization - a new analog standard meter and detection method with digital energy meter detection function. The patent was filed by the State Grid Corporation and was issued an authorization announcement on November 2, 2016.
Figure is a schematic diagram of the structure of a new analog standard meter with digital electric energy meter detection function
　　 A/D analog-to-digital converter, IEC61850 data modulator, IEC61850/FT3 data demodulator, microprocessor, error calculation unit are all connected with DSP unit, display and human-computer interaction unit, interface unit and microprocessor are connected The pulse output interface of the DSP unit and the pulse output interface of the digital energy meter to be tested are connected to the input interface of the error calculator.