New standard analog analysis of digital detection instrument

In the existing technology, only the \"meter-meter\" comparison mode of comparable digital meters can currently be used for the detection of digital energy meters. The correct results lack scientific and legal value.

CN201607526 unveils a digital electricity meter testing device to realize digital power source output. A standard pulse board is used as a standard comparison, and the \"meter-meter\" comparison mode is still used, and its standardization is difficult to be effective. CN103048638 discloses a multi-function inspection device for a digital signal of electrical energy, which contains a digital power source and a pulse unit, realizes digital signal transmission and output, detects standard value calculation of an externally connected detected signal source, but has no real-time signal source functions and analog power source .

The measurement and detection system from analogThe electric energy meters is a very mature and standardized system. If the analog metering system can be used to realize the detection of digital electric energy meters, it can realize one standard and two applications, except metering costs and realize the detection of digital electricity meters. In order to solve the problems in the prior art and realize the analog standard detection method of the digital electric energy meter, the present invention provides a new analog standard meter and detection method with the detection function of the digital electric energy meter.

The technical solution of the present invention is: a new type of standard analog meter 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. Preferably, it also includes display and human-computer interactionunit, a microprocessor and an interface unit for controlling the display and human-computer interaction unit.

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 micro Processors are connected; the pulse output interface of the DSP unit and the pulse output interface of the measured digital electric energy meter are all connected to the input interface of the error calculator.

A/D analog-to-digital converter and DSP unit are connected for calibration/standard traceability of analog energy meters; A/D analog-to-digital converters are connected to IEC61850 data modulators for offline detection of digital energy meters The IEC61850/FT3 demodulator is connected to the DSP unit for online verification and comparison of on-site digital energymeters, electronic mutual inductance inspection and DSP calculation function verification. Through the IEC61850 input/output port, the input/output port of electrical energy pulses and the analog signal channel, a measurement traceability/transmission and verification system can be formed to complete the standard traceability system/transmission network system of the digital meter.

The DSP unit contains a signal analysis module, an electrical parameter calculation module and an electrical energy calculation module, the signal analysis module, the electrical parameter calculation module and the electrical energy calculation module are connected; the A/D analog-to-digital converter, the IEC61850 data modulator and the IEC61850/FT3 data demodulator are connected to the signal analysis module, the error calculator is connected to the electrical energy calculation module, the electrical parameter calculation module and the electrical energy calculation module areconnected to the microprocessor. Through the signal analysis of the DSP unit and the IEC61850/FT3 data demodulator, the digital output electronic transformer inspection function can be realized. At the same time, the DSP unit and the display and human-computer interaction unit realize the three-phase electrical parameters voltage, current, frequency, phase, power and other parameters measurement and synchronous display function.

A/D analog-to-digital converter, IEC61850 data modulator, IEC61850 data demodulator and DSP unit are connected through a data bus, and the data transfer speed is fast. Preferably, the display and human-computer interaction unit, the interface unit and the microprocessor are connected via a data bus, and the DSP unit and the microprocessor are connected via a data bus. There are 6 A/D analog-to-digital converters, which receive three-phase voltage and three-phase current analog signals respectively, and the input interface of threerealize phase voltage and current analog signals.

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 transfer with external devices. The display and human-computer interaction unit includes a display, keys, keyboard and mouse, which facilitate detection of the digital electric energy meter.

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