CN205450247U - An electric energy meter calibration device - Google Patents

Abstract

The utility model provides an electric energy meter calibration device, the calibration device includes parallel connection's standard electric energy meter and surveyed electric energy meter, parallel connection's the both ends of standard electric energy meter and surveyed electric energy meter are connected power supply and next machine respectively, the power supply with the other end of next machine passes through the host computer and connects; the lower computer includes a filter. The utility model provides an electric energy meter calibration equipment is through adding the wave filter in the next machine to eliminate the interference of harmonic to the electric energy meter, and then reach the purpose of carrying out the accuracy check-up to digital metering device. The utility model provides an electric energy meter calibration equipment still increases real-time clock to reach the data synchronization of standard table and the table of awaiting measuring, and then realize the integration to data, still pass through IEC61850 agreement and ZIGBEE's transmission simultaneously, carry out error analysis with the data of standard table and the table of awaiting measuring, reach the effect of control power source simultaneously, accomplish power source output automation.

Description

An electric energy meter calibration device

technical field

The utility model relates to the technical field of electrical engineering, in particular to an electric energy meter calibration device.

Background technique

The National Metrology Law stipulates that the gateway electric energy metering devices used for trade settlement must accept compulsory verification. At present, there are mainly two types of electric energy metering devices: electronic electric energy metering device and digital metering device. Among them, the working mode of electronic electric energy metering device is: the electromagnetic transformer outputs analog voltage signal and current signal, and transmits it to the electric energy meter through the secondary cable. , the electric energy meter converts the analog quantity into a digital pulse quantity, and then calculates the electric energy within a certain period of time through the cumulative counting of the counter, but the electronic electric energy metering device has a large measurement uncertainty. The working mode of the digital metering device is: the electronic transformer outputs digital voltage signals and current signals, and transmits them to the merging unit through optical fiber. This data frame is directly mathematically calculated to obtain the electric energy.

The EC61850 standard is the only global common standard in the field of power installation automation. This standard enables the digitalization of information collection, transmission processing and output processes in substations, and at the same time realizes intelligent equipment, communication networks, models and communication protocols. Run management automation. The digital metering method adopts optical fiber channel for digital transmission, and can effectively eliminate the secondary voltage drop and the analog/digital (A/D) conversion error of the analog electric energy meter, and improve the accuracy and stability of electric energy metering, so it is popularized Digital substation technology can lead to changes in energy metering technology.

However, there are still many technical problems in digital metering, such as poor error stability and operational reliability of electronic transformers, inconsistent communication protocols, poor traceability and on-site calibration capabilities, and inconsistent standards, regulations and specifications. Harmonic energy in electric energy metering will also have a greater impact on digital metering. Due to the above-mentioned problems, there is a lack of a complete digital measurement value transmission system, and thus the digital measurement device cannot be verified.

Utility model content

The purpose of the utility model is to provide an electric energy meter calibration device to solve the problem in the background art that the digital metering device cannot be calibrated due to the influence of harmonic electric energy.

In order to solve the above technical problems, the utility model provides the following technical solutions:

The utility model provides a verification device for an electric energy meter, the verification device includes a standard electric energy meter and a measured electric energy meter connected in parallel, and the two ends of the standard electric energy meter and the measured electric energy meter connected in parallel are respectively The power source is connected to the lower computer, and the other end of the power source and the lower computer is connected through the upper computer; the lower computer includes a filter.

Preferably, the filter includes a first filter connected to the standard electric energy meter and a second filter connected to the measured electric energy meter.

Preferably, the lower computer further includes a first A/D converter connected to the first filter and a second A/D converter connected to the second filter.

Preferably, the lower computer further includes a real-time clock, and the real-time clock is respectively connected to the first A/D converter and the second A/D converter.

Preferably, the lower computer further includes a digital signal processor connected to the real-time clock.

Preferably, the lower computer further includes a memory connected to the digital signal processor.

Preferably, the host computer is a PC processor.

The utility model provides a verification device for an electric energy meter, the verification device includes a standard electric energy meter and a measured electric energy meter connected in parallel, and the two ends of the standard electric energy meter and the measured electric energy meter connected in parallel are respectively The power source is connected to the lower computer, and the other end of the power source and the lower computer is connected through the upper computer; the lower computer includes a filter. The electric energy meter verification device provided by the utility model eliminates the interference of the harmonic wave on the electric energy meter by adding a filter in the lower computer, and then achieves the purpose of accurately verifying the digital metering device. The electric energy meter verification device provided by the utility model also adds a real-time clock, so as to achieve the data synchronization of the standard meter and the meter to be tested, and then realize the integration of the data. At the same time, the standard meter and the meter to be tested Error analysis is performed on the table data, and at the same time it achieves the function of controlling the power source, so as to realize the automatic output of the power source.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, no creative work Other drawings can also be obtained based on these drawings.

Fig. 1 is a schematic structural view of an electric energy meter verification device provided by an embodiment of the present invention;

Fig. 2 is another schematic structural view of the electric energy meter verification device provided by the embodiment of the present invention;

Fig. 3 is a flow chart of the verification method of the electric energy meter verification device provided by the embodiment of the present invention;

Fig. 4 is another flow chart of the verification method of the electric energy meter verification device provided by the embodiment of the present invention.

detailed description

The purpose of the utility model is to provide an electric energy meter verification device, which solves the problem that the digital metering device cannot be verified due to the influence of harmonic electric energy.

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the utility model, and to make the above-mentioned purposes, features and advantages of the embodiments of the utility model more obvious and easy to understand, the following describes the embodiments of the utility model in conjunction with the accompanying drawings The technical scheme in is described in further detail.

Please refer to accompanying drawing 1, accompanying drawing 1 has shown the structure schematic diagram of the electric energy meter verification device provided by the embodiment of the present invention. It can be seen from accompanying drawing 1 that the electric energy meter verification device provided by the embodiment of the present invention comprises a standard electric energy meter and a measured electric energy meter connected in parallel, and two of the standard electric energy meter and the described electric energy meter to be tested in parallel connection The terminals are respectively connected to the power source and the lower computer, and the other end of the power source and the lower computer are connected through the upper computer; the lower computer includes a filter.

Among them, the two ends of the power source are respectively connected to the upper computer, the standard electric energy meter and the measured electric energy meter, and the power source receives the instruction of the required power of the device issued by the upper computer through ZIGBEE and the data returned by the standard electric energy meter and the measured electric energy meter After receiving the instruction from the host computer, the power source outputs power to the standard electric energy meter and the measured electric energy meter according to the instruction. The power source receives instructions from the host computer following the IEC61850 protocol.

The two ends of the lower computer are respectively connected to the standard electric energy meter, the measured electric energy meter and the upper computer, and the lower computer includes a filter, that is, the two ends of the filter are respectively connected to the standard electric energy meter, the measured electric energy meter and the upper computer. The filter can receive and return the voltage, current and pulse data sent by the standard electric energy meter and the electric energy meter under test through the port RS485. At this time, the data contains the voltage, current and pulse data of the standard electric energy meter and the electric energy meter under test. The filter filters the sent voltage, current and pulse data according to the fast Fourier transform algorithm (FFT algorithm), and the processed voltage, current and pulse data without the standard electric energy meter and the electric energy meter under test The digital signal data is sent to the host computer. Adding a filter to the electric energy meter calibration device provided by the embodiment of the utility model can suppress or eliminate the harmonics, thereby eliminating the interference of the harmonics to the electric energy meter, and then achieving the purpose of accurate calibration of the digital metering device.

The two ends of the upper computer are respectively connected to the lower computer and the power source. The upper computer receives the digital signal data sent by the filter, performs error analysis on the digital signal data, and integrates the error analysis and sends it back to the power source.

Correspondingly, the embodiment of the utility model also provides a verification method of the electric energy meter verification device, please refer to the accompanying drawing 3 for the specific process. The checking method that the utility model embodiment provides comprises:

S101: Send the output power source data signal to the power source;

S102: the power source converts the output power source data into a data signal;

S103: send the data signal to the standard electric energy meter and the measured electric energy meter;

S104: the standard watt-hour meter and the measured watt-hour meter respectively send data signals to the filter in the lower computer;

S105: The filter performs filtering processing on the data signal;

S106: Send the filtered data to the host computer;

S107: The host computer performs error analysis on the sent data, and sends the error analysis data to the power source.

The specific description of the above verification method is as follows:

S101: The upper computer sends the required output power source data signal command of the device to the power source through ZIGBEE wireless transmission;

S102: The power source converts the output power source data into voltage, current and pulse data signals that the power source needs to output;

S103: The power source sends the voltage, current and pulse data signals to the standard electric energy meter and the measured electric energy meter respectively;

S104: The standard electric energy meter and the measured electric energy meter respectively send the voltage, current and pulse data signals sent to the filter in the lower computer through the port RS485, and the data signal at this time has the standard electric energy meter and the measured electric energy meter Voltage, current and pulse data;

S105: The filter performs filtering processing on the voltage, current and pulse data signals of the standard electric energy meter and the measured electric energy meter according to the FFT algorithm, and the processing formula is Among them, n is the number of harmonics, P _n is the useful power of the nth harmonic, u _n is the amplitude of the nth harmonic component of the voltage, i _n is the amplitude of the nth harmonic component of the current, is the initial phase angle of the nth harmonic component of the voltage, is the initial phase angle of the nth harmonic component of the current.

S106: The filter sends the filtered data to the host computer, and the transmission of the data follows the IEC61850 protocol;

S107: The host computer performs error analysis on the sent data, and sends the data after error analysis to the power source, thus completing a cycle.

Please refer to the accompanying drawing 2, which shows another schematic structural diagram of the electric energy meter verification device provided by the embodiment of the present invention. Based on the structure of the first electric energy meter verification device, the filter in the electric energy meter verification device provided by the embodiment of the present invention includes a first filter connected with the standard electric energy meter and a second filter connected with the measured electric energy meter Two filters. The first filter performs filtering processing on the voltage, current and pulse data signals sent by the standard electric energy meter, and the second filter performs filtering processing on the voltage, current and pulse data signals sent by the measured electric energy meter, so that the two The voltage, current and pulse data output by the electric energy meter do not interfere with each other, which is beneficial to monitor the detection of the electric energy meter under test.

Further, the first filter is also connected with the first A/D converter, and the second filter is connected with the second A/D converter, such an arrangement is convenient for the first A/D converter and the second A/D converter The D converter converts the data sent by the first filter and the second filter into digital signals that are convenient for computer processing, and the data between the two will not affect each other, which is more conducive to monitoring the detection of the electric energy meter under test. .

The electric energy meter verification device provided by the embodiment of the utility model further includes a real-time clock, which is respectively connected with the first A/D converter and the second A/D converter. The real-time clock simultaneously receives the converted data sent by the first A/D converter and the second A/D converter, and filters and integrates the two converted data, so as to achieve real-time synchronization of the two channels of data information. The real-time clock sends the integrated data to the digital signal processor for processing.

Further, the electric energy meter verification device provided by the embodiment of the present invention also includes a digital signal processor (DSP), and the DSP is connected with a real-time clock. DSP uses assembly language software to judge whether the data sent by the real-time clock integration is a set of synchronous data, and if it is a set of synchronous data, it will filter and adjust to achieve asynchronous data synchronization and ensure real-time data. The DSP sends the adjusted data to memory.

Furthermore, the electric energy meter verification device provided by the embodiment of the present invention also includes a memory (RAM), and the RAM is connected with the DSP. RAM stores the adjusted data and sends it to the host computer.

The upper computer in the electric energy meter verification device provided by the embodiment of the utility model is a PC processor.

Based on the second structure of the electric energy meter verification device provided by the embodiment of the present utility model, the embodiment of the present utility model also provides a verification method of the electric energy meter verification device, please refer to Figure 4 for the flow chart. The verification method of the electric energy meter verification device provided by the embodiment of the utility model is:

S201: Send the output power source data signal to the power source;

S202: The power source converts the output power source data into a data signal;

S203: Send the data signal to the standard electric energy meter and the measured electric energy meter;

S204: the standard watt-hour meter and the measured watt-hour meter respectively send data signals to the first filter and the second filter in the lower computer;

S205: The first filter and the second filter respectively perform filtering processing on the data signal, and send the data signal to the first A/D converter and the second A/D converter respectively;

S206: The first A/D converter and the second A/D converter convert the filtered data and send them to the real-time clock respectively;

S207: the real-time clock filters and integrates the converted data, and sends it to the digital signal processor;

S208: the digital signal processor adjusts the integrated data and sends it to the memory;

S209: the memory stores the adjusted data and sends it to the host computer.

S210: The host computer performs error analysis on the sent data, and sends the error analysis data to the power source.

The specific description of the above verification method is as follows:

S201: The upper computer sends the data signal command of the output power source required by the device to the power source through ZIGBEE wireless transmission;

S202: The power source converts the output power source data into voltage, current and pulse data signals that the power source needs to output;

S203: The power source sends the voltage, current and pulse data signals to the standard electric energy meter and the measured electric energy meter respectively;

S204: The standard watt-hour meter and the measured watt-hour meter respectively send the voltage, current and pulse data signals sent to the first filter and the second filter in the lower computer through the port RS485, and the data signals at this time have standard Voltage, current and pulse data of the electric energy meter and the electric energy meter under test;

S205: The first filter and the second filter respectively filter the voltage, current and pulse data signals with the standard electric energy meter and the measured electric energy meter according to the FFT algorithm, and send the processed data to the first A /D converter and a second A/D converter;

When performing filtering processing according to the FFT algorithm, the processing formula used is Among them, n is the number of harmonics, P _n is the useful power of the nth harmonic, u _n is the amplitude of the nth harmonic component of the voltage, i _n is the amplitude of the nth harmonic component of the current, is the initial phase angle of the nth harmonic component of the voltage, is the initial phase angle of the nth harmonic component of the current.

S206: The first A/D converter and the second A/D converter convert the filtered data into digital signals that are convenient for computer processing, and at the same time the first A/D converter and the second A/D convert The converter sends the converted digital signal to the real-time clock respectively;

S207: The real-time clock filters and integrates the converted data to achieve real-time synchronization of the two channels of data information and sends the integrated data to the DSP;

S208: DSP uses assembly language software to determine whether the data sent after the integration of the real-time clock is a set of synchronous data, and if it is a set of synchronous data, screen and adjust to achieve asynchronous data synchronization and ensure real-time data. The DSP sends the adjusted data to the memory;

S209: the memory stores the adjusted data, and sends the adjusted data to the ZIGBEE of the PC processor through ZIGBEE wireless transmission under the IEC61850 protocol.

S210: The PC processor performs error analysis on the data sent from the memory, and sends the error analysis data to the power source, thus completing a cycle.

The electric energy meter verification device provided by the utility model eliminates the interference of the harmonic wave on the electric energy meter by adding a filter in the lower computer, and then achieves the purpose of accurately verifying the digital metering device. The electric energy meter verification device provided by the utility model also adds a real-time clock, so as to achieve the data synchronization of the standard meter and the meter to be tested, and then realize the integration of the data. At the same time, the standard meter and the meter to be tested Error analysis is performed on the table data, and at the same time it achieves the function of controlling the power source, so as to realize the automatic output of the power source.

Although the utility model has been described in the form of specific embodiments, for those skilled in the art, the utility model can be implemented without departing from the spirit and scope of the utility model defined by the appended claims. Various changes and modifications are also included within the scope of the present invention.

Claims (7)

1. an electric energy meter checking device, it is characterized in that, described calibration equipment includes the standard electric energy meter of parallel join and tested electric energy meter, the described standard electric energy meter of parallel join and the two ends of described tested electric energy meter connect power source and slave computer respectively, and described power source is connected by host computer with the other end of described slave computer；Described slave computer includes wave filter.

Electric energy meter checking device the most according to claim 1, it is characterised in that described wave filter includes the first wave filter being connected with described standard electric energy meter and the second wave filter being connected with described tested electric energy meter.

Electric energy meter checking device the most according to claim 2, it is characterised in that described slave computer also includes the first A/D converter being connected with described first wave filter and the second A/D converter being connected with described second wave filter.

Electric energy meter checking device the most according to claim 3, it is characterised in that described slave computer also includes real-time clock, described real-time clock is connected with described first A/D converter and described second A/D converter respectively.

Electric energy meter checking device the most according to claim 4, it is characterised in that described slave computer also includes that digital signal processor, described digital signal processor are connected with described real-time clock.

Electric energy meter checking device the most according to claim 5, it is characterised in that described slave computer also includes that memorizer, described memorizer are connected with described digital signal processor.

7. according to the electric energy meter checking device described in any one in claim 1-6, it is characterised in that described host computer is PC processor.