Merging unit calibrator traceability method and system

Abstract

The invention discloses a merging unit calibrator traceability method and a system with the merging unit calibrator traceability method, and the merging unit calibrator traceability method based on quantum voltage applies a quantum voltage reference to calibration of a merging unit calibrator. High-accuracy conversion from an analog signal to a digital signal is realized by using a standard converter, a quantum voltage standard device, a sampling unit and a data reconstruction unit, and the uncertainty level of the digital signal is improved. Compared with a traditional traceability method of the merging unit calibrator, the digital quantity is traced to the quantum voltage standard device, the traceability uncertainty level is improved, and flat traceability of the quantity value is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical measurement and metrology, and in particular to a method and system for tracing a combined unit calibrator. Background Art

[0002] The merging unit is mainly used for the digitization of the secondary signals of the voltage transformer and the current transformer of the power system. Therefore, the input signal type of the merging unit is an analog signal, and the output signal type is a digital signal of the IEC 61850 protocol. The merging unit calibrator, as the error measurement device of the merging unit, realizes the calibration of the measurement error of the merging unit by calculating the amplitude error and phase error of the analog signal and the digital signal input by the merging unit. Its accuracy mainly comes from the conversion of the analog signal to the digital signal. The accuracy of the merging unit calibrator is usually higher than that of the merging unit. For example, if the accuracy of the merging unit is 0.2%, the accuracy of the merging unit calibrator is at least 0.05%. In order to calibrate the performance of the merging unit calibrator, at least 0.01% of the merging unit calibrator calibration device is required to calibrate it. Usually, an 8-bit and a half digital multimeter is used to realize the conversion of standard analog signals to digital signals, but its conversion accuracy is generally around 0.01%, which limits the accuracy of the merging unit calibrator calibration device. In addition, this calibration method traces the digital value to a high-precision digital multimeter, and then traces it to a calibration source with higher accuracy through the digital multimeter, using a step-by-step physical quantity transmission method.

[0003] At present, the traceability method of the merged unit calibrator is based on the conversion of analog signals to digital signals using a high-accuracy 8.5-digit digital multimeter, and the traceability accuracy is limited by the accuracy of the digital multimeter and cannot be further improved. For example, in the continuous sampling output mode, the accuracy of the 8.5-digit digital multimeter can only reach 0.01% at best, which can only meet the value traceability of the 0.05-level merged unit calibrator. The merged unit value traceability system constructed based on this can only achieve the value traceability of the 0.2-level merged unit at the power site, but it cannot achieve the value traceability of the merged unit with higher accuracy. On the one hand, the existing value traceability method limits the value traceability level of the merged unit or power transformer with higher accuracy in the future. On the other hand, the existing value traceability method does not meet the future flat traceability needs. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for tracing the merged unit calibrator, which can use quantum voltage as a reference voltage reference, convert the quantum voltage and the analog differential signal of the analog signal to be measured into a digital signal, and then add the converted discrete digital signal to the quantum voltage value, thereby reconstructing the digital signal value of the analog signal to be measured, thereby realizing high-accuracy conversion of the analog signal to be measured to the digital signal based on the quantum voltage reference. A higher-accuracy analog signal to digital signal value transfer is achieved, solving the problem of limited accuracy in the value traceability process of the merged unit calibrator, and realizing quantized traceability.

[0005] The present invention also proposes a system having the above-mentioned quantum voltage-based merge unit calibrator traceability method.

[0006] According to the first aspect of the present invention, the quantum voltage-based merged unit calibrator traceability method is characterized by comprising the following steps:

[0007] The voltage or current signal A output by the power source is simultaneously input to the analog signal input terminals of the merging unit tester to be tested and the standard converter;

[0008] The standard converter converts the power source output voltage or current signal A into a voltage signal B, the quantum voltage standard device outputs a quantum voltage signal C as a reference voltage benchmark, and performs continuous digital signal conversion on the differential signal of the quantum voltage signal C and the voltage signal B through the sampling unit and outputs a discrete digital signal, and in the data reconstruction unit, a series of quantum voltage values ​​are superimposed on the discrete digital signal output by the sampling unit to output a digital signal D that simulates the voltage waveform to be measured;

[0009] The digital signal D is received at the digital signal input end of the merged unit calibrator to be tested, and the merged unit calibrator to be tested calculates the amplitude error and phase error between the voltage or current signal A at the analog signal input end and the digital signal D at the digital signal input end, thereby realizing the calibration of the measurement error of the merged unit calibrator to be tested.

[0010] The quantum voltage-based merged unit calibrator traceability method according to the embodiment of the present invention has at least the following beneficial effects: the quantum voltage-based merged unit calibrator traceability method provided by the present invention applies the quantum voltage reference to the calibration of the merged unit calibrator, and uses the standard converter, quantum voltage standard device, sampling unit and data reconstruction unit to realize high-accuracy conversion of analog signal to digital signal, thereby improving the uncertainty level of digital quantity signal. Compared with the traditional merged unit calibrator traceability method, this patent improves the traceability uncertainty level by tracing the digital quantity to the quantum voltage standard device, thereby realizing the flat traceability of the quantity value.

[0011] According to some embodiments of the present invention, the standard converter has a voltage input mode and a current input mode. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient; when the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

[0012] According to some embodiments of the present invention, the voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz. When the power source outputs a voltage signal, the voltage amplitude of the power source is 100 V or 100 V. When the power source outputs a current signal, the current amplitude of the power source is 1 A or 5 A.

[0013] According to some embodiments of the present invention, the quantum voltage signal C is an AC step waveform with a frequency of 50 Hz, each cycle contains N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n=0, 1, 2, 3..., N-1, where u(0)=u(N)=0.

[0014] According to some embodiments of the present invention, when the quantum voltage standard device outputs the quantum voltage signal C as a reference voltage, it also outputs a first pulse signal and a second pulse signal, wherein:

[0015] The first pulse signal is a step edge pulse of an AC step waveform output by the quantum voltage standard device. Each time the quantum voltage standard device starts to output a step voltage u(n), the first pulse signal generates a rising edge. After the rising edge of the first pulse signal arrives, the sampling unit starts to trigger sampling after a delay of half the step width.

[0016] When the quantum voltage standard device starts to output the u(0) step, it starts to output the rising edge of the second pulse signal after a delay time T1; the period of the second pulse signal is 50×N times the period of the first pulse signal, and the second pulse signal is used as a reference for the step voltage output.

[0017] According to some embodiments of the present invention, after receiving the second pulse signal, the sampling unit starts to number the sampling values ​​triggered by the first pulse signal in sequence starting from 0 and sends them to the data reconstruction unit, with a numbering interval of 1. After sending a total of 50×N sampling values, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and starts numbering from 0 again, and repeats this cycle.

[0018] According to some embodiments of the present invention, after receiving the sampled value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the moment when the quantum voltage standard device outputs the rising edge of the second pulse signal according to the delay time T1, superimposes the sampled value numbered 0 with the step value to obtain a digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IEC61850 protocol format as a digital signal D. .

[0019] According to the second aspect of the present invention, the quantum voltage-based merged unit calibrator traceability system is characterized by comprising:

[0020] A power source, used to simultaneously input the output voltage or current signal A to the analog signal input terminals of the merging unit tester to be tested and the standard converter;

[0021] A standard converter, used to convert a power source output voltage or current signal A into a voltage signal B;

[0022] A quantum voltage standard device, used to output a quantum voltage signal C as a reference voltage standard;

[0023] A sampling unit, used for performing continuous digital signal conversion on the differential signal of the quantum voltage signal C and the voltage signal B and outputting a discrete digital signal;

[0024] A data reconstruction unit, used to superimpose a series of quantum voltage values ​​on the discrete digital signal output by the sampling unit, and output a digital signal D simulating the voltage waveform to be measured;

[0025] The merging unit calibrator to be tested receives the digital signal D at its digital signal input terminal. The merging unit calibrator to be tested is used to calculate the amplitude error and phase error between the voltage or current signal A at the analog signal input terminal and the digital signal D at the digital signal input terminal, thereby realizing the calibration of the measurement error of the merging unit calibrator to be tested.

[0026] According to some embodiments of the present invention, the standard converter has a voltage input mode and a current input mode. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient; when the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

[0027] According to some embodiments of the present invention, the voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz. When the power source outputs a voltage signal, the voltage amplitude of the power source is 100 V or 100 V. When the power source outputs a current signal, the current amplitude of the power source is 1 A or 5 A.

[0028] According to some embodiments of the present invention, the quantum voltage signal C is an AC step waveform with a frequency of 50 Hz, each cycle contains N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n=0, 1, 2, 3..., N-1, where u(0)=u(N)=0.

[0029] According to some embodiments of the present invention, in the signal conversion module, when the quantum voltage standard device outputs the quantum voltage signal C as a reference voltage, it also outputs a first pulse signal and a second pulse signal, wherein:

[0030] The first pulse signal is a step edge pulse of an AC step waveform output by the quantum voltage standard device. Each time the quantum voltage standard device starts to output a step voltage u(n), the first pulse signal generates a rising edge. After the rising edge of the first pulse signal arrives, the sampling unit starts to trigger sampling after a delay of half the step width.

[0031] When the quantum voltage standard device starts to output the u(0) step, it starts to output the rising edge of the second pulse signal after a delay time T1; the period of the second pulse signal is 50×N times the period of the first pulse signal, and the second pulse signal is used as a reference for the step voltage output.

[0032] According to some embodiments of the present invention, after receiving the second pulse signal, the sampling unit starts to number the sampling values ​​triggered by the first pulse signal in sequence starting from 0 and sends them to the data reconstruction unit, with a numbering interval of 1. After sending a total of 50×N sampling values, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and starts numbering from 0 again, and repeats this cycle.

[0033] According to some embodiments of the present invention, after receiving the sampling value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the moment when the quantum voltage standard device outputs the rising edge of the second pulse signal according to the delay time T1, superimposes the sampling value numbered 0 with the step value to obtain a digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IEC61850 protocol format as a digital signal D.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 Schematic diagram of a method for tracing a merged unit calibrator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] With the development of quantization technology and the emergence of quantum voltage standards, flattened quantum quantity transmission methods have significant advantages. The voltage quantity can be directly traced to the quantum voltage standard, and the traditional gradual quantity transmission is no longer needed, thereby improving the accuracy and reliability of quantity transmission and traceability. Based on the above reasons, the present application provides a quantum voltage-based merged unit calibrator traceability method.

[0042] like Figure 1As shown, an embodiment of the present invention provides a quantum voltage-based merge unit calibrator traceability method, comprising:

[0043] The power source output voltage or current signal A is simultaneously input to the analog signal input terminals of the merging unit calibrator to be tested and the standard converter.

[0044] The standard converter converts the power source output voltage or current signal into a voltage signal B below 10V. The quantum voltage standard device outputs a quantum voltage signal C as a reference voltage benchmark. The differential signal between the quantum voltage signal C and the voltage signal B is continuously converted into a digital signal through the sampling unit. In the data reconstruction unit, the converted discrete digital signal is superimposed with a series of quantum voltage values ​​to output a digital signal D that simulates the voltage waveform to be measured.

[0045] The above steps utilize a standard converter, a quantum voltage standard device, a sampling unit, and a data reconstruction unit to achieve high-accuracy conversion of a voltage or current signal A into a digital signal D.

[0046] The digital signal D is input into the digital signal input terminal of the merging unit calibrator to be tested, and the amplitude error and phase error between the voltage or current signal A at the analog signal input terminal calculated by the merging unit calibrator to be tested and the digital signal D at the digital signal input terminal are recorded, thereby realizing the calibration of the measurement error of the merging unit calibrator to be tested.

[0047] Furthermore, the above-mentioned standard converter, quantum voltage standard device, sampling unit and data reconstruction unit constitute a standard merging unit based on quantum voltage from analog signal to digital signal, which can convert the voltage or current signal A output by the power source into the corresponding digital signal D. The digital signal D is a series of SV digital messages framed in accordance with the IEC61850 protocol format and output to the digital signal input terminal of the merging unit tester to be tested.

[0048] Preferably, the standard converter has a voltage input mode and a current input mode, and the two modes change accordingly with the output of the power source. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient. When the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

[0049] The voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz. When the power source outputs a voltage signal, the voltage amplitude is 100 V or 100 / V. When the power source outputs a current signal, the current amplitude is 1 A or 5 A.

[0050] Furthermore, the quantum voltage signal C output by the quantum voltage standard device is an AC step waveform with a frequency of 50 Hz, and its amplitude and phase are controlled to be close to the voltage signal B. Each cycle of the AC step waveform contains N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n = 0, 1, 2, 3..., N-1, where u(0) = u(N) = 0, u(N) is the initial signal of the next cycle; the step voltage sequence is output in sequence and cycle. In addition, the quantum voltage standard device also outputs two pulse signals, namely pulse 1 and pulse 2.

[0051] Pulse 1 is the step edge pulse of the AC step waveform output by the quantum voltage standard device, that is, each time the quantum voltage standard device starts to output a step voltage, pulse 1 generates a rising edge, and the sampling unit starts to trigger sampling after a delay of half the step width after the rising edge of pulse 1 arrives.

[0052] Pulse 2 is used as a reference for the u(0) step output. The period of pulse 2 is 50×N times that of pulse 1. At the moment when the u(0) step output starts, after the delay time T1, the rising edge of pulse 2 starts to be output. At the same time, pulse 2 is used as the starting moment for the sampling value of the sampling unit to be sent. Starting from pulse 2, the sampling values ​​triggered by the rising edge of pulse 1 are numbered in sequence from 0 and sent to the data reconstruction unit. The numbering interval is 1. After a total of 50×N sampling values ​​are sent, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and the numbering starts from 0 again, and the cycle repeats. In addition, the above-mentioned pulse 2 can also be used as an external synchronization signal of the calibrator of the combined unit to be tested.

[0053] After receiving the sampling value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the rising edge of pulse 2 according to the delay time T1, and superimposes the sampling value numbered 0 with the step value to obtain the digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IE C61850 protocol format.

[0054] After receiving each sample value, the data reconstruction unit superimposes the step value at the corresponding moment, and obtains a discrete voltage value sequence, namely, Δu(1)+u(m+1), Δu(2)+u(m+2), ... Δu(x)+u(n=m+x). After x and n reach 50×N-1 and N-1 respectively, they are cyclically numbered starting from 0.

[0055] After receiving the voltage or current signal A output by the power source, the pulse 2 output by the quantum voltage standard device, and the SV digital message sequence (digital signal D) sent by the data reconstruction unit, the merging unit calibrator to be tested can calculate the ratio difference and the angle difference, which can be used as the error of the merging unit calibrator to be tested.

[0056] Another embodiment of the present application provides a quantum voltage-based merged unit calibrator traceability system, the system comprising:

[0057] A power source, used to simultaneously input the output voltage or current signal A to the analog signal input terminals of the merging unit tester to be tested and the standard converter;

[0058] A standard converter, used to convert a power source output voltage or current signal A into a voltage signal B;

[0059] A quantum voltage standard device, used to output a quantum voltage signal C as a reference voltage standard;

[0060] A sampling unit, used for performing continuous digital signal conversion on the differential signal of the quantum voltage signal C and the voltage signal B and outputting a discrete digital signal;

[0061] A data reconstruction unit, used to superimpose a series of quantum voltage values ​​on the discrete digital signal output by the sampling unit, and output a digital signal D simulating the voltage waveform to be measured;

[0062] The merging unit calibrator to be tested receives the digital signal D at its digital signal input terminal. The merging unit calibrator to be tested is used to calculate the amplitude error and phase error between the voltage or current signal A at the analog signal input terminal and the digital signal D at the digital signal input terminal, thereby realizing the calibration of the measurement error of the merging unit calibrator to be tested.

[0063] Furthermore, the standard converter, quantum voltage standard device, sampling unit and data reconstruction unit constitute a standard merging unit, which can convert the analog signal of quantum voltage into a digital signal, and frame the SV digital message in accordance with the IEC61850 protocol format, and output it to the digital signal input terminal of the merging unit calibrator to be tested.

[0064] Furthermore, the standard converter has a voltage input mode and a current input mode, and the two modes change accordingly with the output of the power source. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient; when the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

[0065] Furthermore, the voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz. When the power source outputs a voltage signal, the voltage amplitude is 100 V or 100 / V. When the power source outputs a current signal, the current amplitude is 1 A or 5 A.

[0066] Furthermore, the voltage signal C is an AC step waveform with a frequency of 50 Hz, each cycle includes N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n=0, 1, 2, 3..., N-1, where u(0)=u(N)=0.

[0067] Furthermore, when the quantum voltage standard device outputs the quantum voltage signal C as a reference voltage, it also outputs a first pulse signal and a second pulse signal, wherein:

[0068] The first pulse signal is a step edge pulse of an AC step waveform output by the quantum voltage standard device. Every time the quantum voltage standard device starts to output a step voltage, the first pulse signal generates a rising edge. After the rising edge of the first pulse signal arrives, the sampling unit starts to trigger sampling after a delay of half the step width.

[0069] The period of the second pulse signal is 50×N times that of the first pulse signal. At the moment when the u(0) step starts to be output, after a delay time T1, the rising edge of the second pulse signal starts to be output.

[0070] Furthermore, the second pulse signal is the starting moment when the sampling value of the sampling unit is sent. Starting from the second pulse signal, the sampling values ​​triggered by the rising edge of the first pulse signal are numbered in sequence from 0 and sent to the data reconstruction unit, with a numbering interval of 1. After sending a total of 50×N sampling values, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and the numbering starts from 0 again, and the cycle continues.

[0071] Furthermore, after receiving the sampling value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the rising edge of the second pulse signal according to the delay time T1, and superimposes the sampling value numbered 0 with the step value to obtain a digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IEC61850 protocol format.

[0072] The embodiment of the present application applies the quantum voltage reference to the calibration of the merged unit calibrator, and uses the standard converter, quantum voltage standard device, sampling unit and data reconstruction unit to realize high-accuracy conversion of analog signal to digital signal, thereby improving the uncertainty level of digital quantity signal. Compared with the traditional traceability method of the merged unit calibrator, this patent improves the traceability uncertainty level by tracing the digital quantity to the quantum voltage standard device, and realizes the flat traceability of the value.

[0073] The quantum voltage-based merged unit calibrator traceability method is generally used by third-party metrology testing institutions, scientific research institutes and merged unit calibration equipment manufacturers to carry out calibration testing of merged unit calibrators, and to achieve flattened value traceability of merged unit calibrators through quantum voltage. In addition, quantum voltage can also be used to achieve value traceability of instruments such as standard signal sources and digital multimeters.

[0074] The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0076] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A method for tracing the source of a merged unit calibrator, characterized in that: The following steps are involved: The voltage or current signal A output by the power source is simultaneously input to the analog signal input terminals of the merging unit tester to be tested and the standard converter; The standard converter converts the power source output voltage or current signal A into a voltage signal B, the quantum voltage standard device outputs a quantum voltage signal C as a reference voltage benchmark, and performs continuous digital signal conversion on the differential signal of the quantum voltage signal C and the voltage signal B through the sampling unit and outputs a discrete digital signal, and in the data reconstruction unit, a series of quantum voltage values ​​are superimposed on the discrete digital signal output by the sampling unit to output a digital signal D that simulates the voltage waveform to be measured; The digital signal input end of the merged unit calibrator to be tested receives the digital signal D, and the merged unit calibrator to be tested calculates the amplitude error and phase error between the voltage or current signal A at the analog signal input end and the digital signal D at the digital signal input end, thereby realizing the calibration of the measurement error of the merged unit calibrator to be tested.

2. The method according to claim 1, characterized in that: The standard converter has a voltage input mode and a current input mode. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient; when the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

3. The method according to claim 2, characterized in that The voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz.

4. The method according to claim 1, characterized in that: The quantum voltage signal C is an AC step waveform with a frequency of 50 Hz. Each cycle contains N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n=0, 1, 2, 3..., N-1, where u(0)=u(N)=0.

5. The method according to claim 4, characterized in that When the quantum voltage standard device outputs the quantum voltage signal C as a reference voltage, it also outputs a first pulse signal and a second pulse signal, wherein: The first pulse signal is a step edge pulse of an AC step waveform output by the quantum voltage standard device. Each time the quantum voltage standard device starts to output a step voltage u(n), the first pulse signal generates a rising edge. After the rising edge of the first pulse signal arrives, the sampling unit starts to trigger sampling after a delay of half the step width. When the quantum voltage standard device starts to output the u(0) step, it starts to output the rising edge of the second pulse signal after a delay time T1; the period of the second pulse signal is 50×N times the period of the first pulse signal, and the second pulse signal is used as a reference for the step voltage output.

6. The method according to claim 5, characterized in that After receiving the second pulse signal, the sampling unit starts to number the sampling values ​​triggered by the first pulse signal in sequence starting from 0 and sends them to the data reconstruction unit, with a numbering interval of 1. After sending a total of 50×N sampling values, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and starts numbering again from 0, and repeats this cycle.

7. The method according to claim 5, characterized in that After receiving the sampling value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the moment when the quantum voltage standard device outputs the rising edge of the second pulse signal according to the delay time T1, superimposes the sampling value numbered 0 with the step value to obtain a digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IEC61850 protocol format as a digital signal D.

8. A combined unit calibrator traceability system, characterized in that: include: A power source, used to simultaneously input the output voltage or current signal A to the analog signal input terminals of the merging unit tester to be tested and the standard converter; A standard converter, used to convert a power source output voltage or current signal A into a voltage signal B; A quantum voltage standard device, used to output a quantum voltage signal C as a reference voltage standard; A sampling unit, used for performing continuous digital signal conversion on the differential signal of the quantum voltage signal C and the voltage signal B and outputting a discrete digital signal; A data reconstruction unit, used to superimpose a series of quantum voltage values ​​on the discrete digital signal output by the sampling unit, and output a digital signal D simulating the voltage waveform to be measured; The merging unit calibrator to be tested receives the digital signal D at its digital signal input terminal. The merging unit calibrator to be tested is used to calculate the amplitude error and phase error between the voltage or current signal A at the analog signal input terminal and the digital signal D at the digital signal input terminal, thereby realizing the calibration of the measurement error of the merging unit calibrator to be tested.

9. The system according to claim 8, characterized in that The standard converter has a voltage input mode and a current input mode. When the power source outputs a voltage signal, the standard converter operates in the voltage input mode and converts the voltage signal A output by the power source into a voltage signal B according to a certain proportional coefficient; when the power source outputs a current signal, the standard converter operates in the current input mode and converts the current signal A output by the power source into a voltage signal B according to a certain proportional coefficient.

10. The system according to claim 9, characterized in that The voltage or current signal A output by the power source is an AC waveform with a frequency of 50 Hz. When the power source outputs a voltage signal, the voltage amplitude of the power source is 100 V or 100 V. When the power source outputs a current signal, the current amplitude of the power source is 1 A or 5 A.

11. The system according to claim 8, characterized in that The quantum voltage signal C is an AC step waveform with a frequency of 50 Hz. Each cycle contains N steps of equal time width, N is an integer, and the step voltage sequence is u(n), n=0, 1, 2, 3..., N-1, where u(0)=u(N)=0.

12. The method according to claim 11, characterized in that In the signal conversion module, when the quantum voltage standard device outputs the quantum voltage signal C as a reference voltage, it also outputs a first pulse signal and a second pulse signal, wherein: The first pulse signal is a step edge pulse of an AC step waveform output by the quantum voltage standard device. Each time the quantum voltage standard device starts to output a step voltage u(n), the first pulse signal generates a rising edge. After the rising edge of the first pulse signal arrives, the sampling unit starts to trigger sampling after a delay of half the step width. When the quantum voltage standard device starts to output the u(0) step, it starts to output the rising edge of the second pulse signal after a delay time T1; the period of the second pulse signal is 50×N times the period of the first pulse signal, and the second pulse signal is used as a reference for the step voltage output.

13. The method according to claim 12, characterized in that After receiving the second pulse signal, the sampling unit starts to number the sampling values ​​triggered by the first pulse signal in sequence starting from 0 and sends them to the data reconstruction unit, with a numbering interval of 1. After sending a total of 50×N sampling values, the sampling value sequence is Δu(x), x=0, 1, 2, 3..., 50×N-1, and starts numbering again from 0, and repeats this cycle.

14. The method according to claim 12, characterized in that After receiving the sampling value numbered 0, the data reconstruction unit calculates the step value u(m) of the AC step waveform output by the quantum voltage standard device at the moment when the quantum voltage standard device outputs the rising edge of the second pulse signal according to the delay time T1, superimposes the sampling value numbered 0 with the step value to obtain a digital quantity Δu(0)+u(m), and then frames the digital quantity into an SV digital message according to the IEC61850 protocol format as a digital signal D.

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