CN211148891U - Inspection system of electronic transformer calibrator - Google Patents

Abstract

The utility model discloses an inspection system for an electronic transformer calibrator, comprising: a power frequency proportional power supply for generating and outputting a reference signal and a measured signal; a high-precision digital multimeter for collecting and storing the measured signal signal and generate a synchronization signal; a reading module is used to read the measured signal stored in the high-precision digital multimeter under the drive of the synchronization signal to obtain the read data, and forward the synchronization signal and output the read data; protocol converter, Driven by the synchronization signal, the read data is encapsulated into data with a standard protocol format, and the synchronization signal is forwarded and the encapsulated read data is output; and the analog channel of the electronic transformer calibrator receives the reference signal, which The digital channel receives the encapsulated read data; and calculates according to the encapsulated read data and the reference signal to obtain error information. The utility model improves the precision of the inspection system of the electronic transformer calibrator.

Description

Inspection system of electronic transformer calibrator

technical field

The utility model relates to the technical field of transformer calibration, in particular to a calibration and inspection system of an electronic transformer calibrator.

Background technique

With the development of power system and sensing technology, electronic transformers have become an important part of intelligent substations. Compared with traditional electromagnetic transformers, electronic transformers have obvious advantages in insulation performance and volume. Its application can improve the level of digitization and intelligence of intelligent substations, and its operation performance is related to the reliable operation of the entire intelligent substation. The rapid development of smart grids has put forward a higher level of performance of electronic transformers.

Electronic transformer calibrator is a calibration equipment for electronic transformers. It is used to determine the accuracy level of electronic transformers. An accurate and reliable calibration process is the key to determining the performance indicators of electronic transformers. The accuracy level of electronic transformers operating on the grid is mostly 0.2. IEC and national standards even mention 0.1 electronic transformers. From the point of view of measurement, the accuracy of the standard device is two higher than the measured accuracy. Magnitude. This requires that the accuracy level of the electronic transformer calibrator should be at least 0.05 or even higher. In order to calibrate the electronic transformer calibrator, the accuracy level of the existing calibration equipment can only be 0.02, which cannot meet the calibration of the 0.02 electronic transformer calibrator. In principle, it cannot be used as the whole inspection equipment of the 0.05-level electronic transformer calibrator.

The sampling of the AC signal by the current electronic transformer calibrator inspection system is affected by the internal acquisition card and clock jitter, and the accuracy level can only reach 0.02, especially for the lower limit signal of the small range, the sampling phase noise is relatively large , the accuracy of the whole inspection system is not high, the uncertainty is large, and it cannot meet the application in the case of high-precision verification. In order to calibrate the electronic transformer calibrator of class 0.05 or 0.02, it is necessary to develop a higher-precision electronic transformer calibrator calibration system to achieve high accuracy of the electronic transformer calibrator. Accuracy check.

Utility model content

The purpose of the utility model is to provide an inspection system for an electronic transformer calibrator, which is used to solve the problems of low inspection accuracy and large phase jitter of the existing electronic transformer calibrator.

In order to achieve the above purpose, the present utility model realizes through the following technical solutions:

An inspection system for an electronic transformer calibrator, which is used for calibrating an electronic transformer calibrator, comprising: a power frequency proportional power supply, which is used to generate and output a reference signal and a measured signal;

A high-precision digital multimeter, which is used for collecting and storing the measured signal, and at the same time, generating and outputting a synchronization signal;

The reading module is used for reading the measured signal stored by the high-precision digital multimeter under the drive of the synchronization signal it receives to obtain read data, and forwarding the synchronization signal and outputting the data. read data;

a protocol converter, which is used to encapsulate the read data it receives into data that meets the standard protocol format of the electronic transformer transmission protocol under the drive of the synchronization signal it receives, and forward the read data synchronizing signals and outputting the encapsulated read data; and

The analog channel of the electronic transformer calibrator is connected to the reference output port of the power frequency proportional power supply for receiving the reference signal, and the digital channel of the electronic transformer calibrator is connected to the reference signal. The data output end of the protocol converter is connected for receiving the encapsulated read data; the electronic transformer calibrator is based on the encapsulated read data and the encapsulated read data it receives. The reference signal is compared and calculated to obtain its own error information.

Further, the reference signal is a standard current signal or a voltage signal; the measured signal is a voltage or current signal superimposed with a preset ratio error and phase error on the basis of the reference signal; the ratio error The sum phase error is the ratio error and phase error between the reference signal and the measured signal set according to the range of the electronic transformer calibrator.

Preferably, the DC sampling accuracy of the high-precision digital multimeter is above 0.005.

Preferably, the high-precision digital multimeter uses a DCV acquisition mode to collect the measured signal.

Preferably, the reading module is a real-time synchronization acquisition card.

Preferably, the accuracy level of the power frequency proportional power supply is above 0.2.

Preferably, the high-precision digital multimeter is connected to the reading module by using a GPIB bus.

Preferably, the synchronization signal is a TTL pulse output signal.

Preferably, the standard protocol format is a standard digital output protocol format of IEC61850-9-2 format, IEC61850-9-2LE format or FT3 format.

Preferably, the measured signal stored by the high-precision digital multimeter is digital sampling point data.

Compared with the prior art, the utility model has the following advantages:

The utility model provides an inspection system for an electronic transformer calibrator, which is used for calibrating the electronic transformer calibrator, comprising: a power frequency proportional power supply, which is used for generating and outputting a reference signal and a measured signal; a high-precision digital multimeter, which is used to collect and store the measured signal, and at the same time, generate and output a synchronization signal; a reading module, which is used to read all the synchronization signals under the drive of the received synchronization signal. The measured signal stored by the high-precision digital multimeter obtains read data, and forwards the synchronization signal and outputs the read data; a protocol converter, which is used for driving the received synchronization signal and encapsulates the read data it receives into data that satisfies the standard protocol format of the electronic transformer transmission protocol, and forwards the synchronization signal and outputs the encapsulated read data; and the electronic The analog channel of the transformer calibrator is connected to the reference output port of the power frequency proportional power supply for receiving the reference signal, and the digital channel of the electronic transformer calibrator is connected to the protocol converter The data output terminal is connected to receive the encapsulated read data; the electronic transformer calibrator performs the encapsulation based on the encapsulated read data and the reference signal it receives The comparison calculation obtains the measurement error information. Therefore, the present invention adopts the internal time base (the above-mentioned synchronization signal) of the high-precision digital multimeter as the clock of the entire calibration system, and the time base jitter can be controlled within 50ps. The sampling phase noise is reduced by at least three orders of magnitude, which greatly reduces the measurement uncertainty of the inspection system, that is, the utility model reduces the jitter of the sampling clock, thereby improving the accuracy of the inspection system of the electronic transformer calibrator (level of accuracy). From this, it can be further known that the utility model solves the inherent defects of low measurement accuracy and large jitter of sampling data of the traditional electronic transformer calibrator inspection system, and truly realizes the traceability system of the electronic transformer calibration system. On this basis, a benchmark for high-voltage digital signal transmission can be established (a high-voltage digital traceability system with the highest national accuracy level can be established), and reliable technical support is provided for the hierarchical application of electronic transformers in smart substations.

Description of drawings

FIG. 1 is a structural block diagram of an inspection system of an electronic transformer calibrator according to an embodiment of the present invention.

Description of reference numbers:

100-power frequency proportional power supply; 200-high-precision digital multimeter; 300-reading module; 400-protocol converter; 500-electronic transformer calibrator.

Detailed ways

The following is a further detailed description of the inspection system of the electronic transformer calibrator proposed by the present invention with reference to FIG. 1 and the specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in a very simplified form and all use inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. For the purpose, features and advantages of the present invention to be more clearly understood, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with this technology, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect that the present utility model can produce and the purpose that can be achieved, should still fall within the scope of the present invention. The technical content disclosed by the utility model can be covered within the scope.

The core idea of the present invention is to provide an inspection system for an electronic transformer calibrator, which is used for calibrating the electronic transformer calibrator, including: a power frequency proportional power supply, which is used to generate and output a reference signal and the signal under test; a high-precision digital multimeter, which is used to collect and store the signal under test, and at the same time, generate and output a synchronization signal; a reading module, which is used to drive the received synchronization signal, Read the measured signal stored by the high-precision digital multimeter to obtain read data, and forward the synchronization signal and output the read data; a protocol converter, which is used for the synchronization in the received Driven by the signal, encapsulate the received read data into data that meets the standard protocol format of the electronic transformer transmission protocol, and forward the synchronization signal and output the encapsulated read data; and The analog channel of the electronic transformer calibrator is connected to the reference output port of the power frequency proportional power supply for receiving the reference signal, and the digital channel of the electronic transformer calibrator is connected to the reference signal. The data output end of the protocol converter is connected for receiving the encapsulated read data; the electronic transformer calibrator is based on the encapsulated read data and the encapsulated read data it receives. The reference signal is compared and calculated to obtain measurement error information. Therefore, the present invention adopts the internal time base (the above-mentioned synchronization signal) of the high-precision digital multimeter as the clock of the entire calibration system, and the time base jitter can be controlled within 50ps. The sampling phase noise is reduced by at least three orders of magnitude, which greatly reduces the measurement uncertainty of the inspection system, that is, the present utility model reduces the jitter of the sampling clock, thereby improving the precision (accuracy) of the electronic transformer calibrator. grade). From this, it can be further known that the utility model solves the inherent defects of low measurement accuracy and large jitter of sampling data of the traditional electronic transformer calibrator inspection system, and truly realizes the traceability system of the electronic transformer calibration system. On this basis, a benchmark for high-voltage digital signal transmission can be established, providing reliable technical support for the grading application of electronic transformers in smart substations.

Specifically, as shown in FIG. 1 , this embodiment provides an inspection system for an electronic transformer calibrator, which is used for calibrating an electronic transformer calibrator 500, including: a power frequency proportional power supply 100, a high The precision digital multimeter 200, the reading module 300 and the protocol converter 400; the power frequency proportional power supply 100 is provided with two output ends, one of which is the measured output end (not numbered in the figure), and the other output end is Reference output terminal (not numbered in the figure); the measured output terminal is connected to the input terminal of the high-precision digital multimeter 200, and the reference output terminal is connected to the electronic transformer calibrator 500. The data output end of the high-precision digital multimeter 200 is connected with the data input end of the reading module 300, and the signal output end of the high-precision digital multimeter 200 is connected with the signal of the reading module 300. The input end is connected; the data output end of the reading module 300 is connected with the data input end of the protocol converter 400, and the signal output end of the reading module 300 is connected with the signal input end of the protocol converter 400; The data output end of the protocol converter 400 is connected to the digital channel of the electronic transformer calibrator 500 , and the signal output end of the protocol converter 400 is connected to the signal of the electronic transformer calibrator 500 . input connection. In this embodiment, the connection between the data output terminal of the high-precision digital multimeter 200 and the data input terminal of the reading module 300 is realized through the GPIB bus. And realize the connection between the data output end of the protocol converter 400 and the digital channel of the electronic transformer calibrator 500 through optical fiber. Because the high-precision digital multimeter 200 uses the GPIB bus to connect with the reading module 300, the GPIB bus improves the transmission rate and the total number of devices supported at the same time than the serial port control. It can be seen that it can improve the electronic transformer. The calibration efficiency of the calibration system of the calibrator. In this embodiment, the connection between the data output end of the protocol converter 400 and the digital channel of the electronic transformer calibrator 500 is also realized through an optical fiber. It can be seen from this that the interference of noise in the data transmission process can be avoided, and the calibration accuracy of the calibration system of the electronic transformer calibrator can be further improved.

Further, the power frequency proportional power supply 100 is used for generating and outputting a reference signal and a signal under test; the high-precision digital multimeter 200 is used for collecting and storing the signal under test, and at the same time, generating and outputting a synchronization signal; The reading module 300 is configured to read the measured signal stored in the high-precision digital multimeter 200 under the drive of the synchronization signal it receives to obtain read data, and forward the synchronization signal and output the data. the read data; the protocol converter 400 is used to encapsulate the read data received into a standard protocol format that satisfies the transmission protocol of the electronic transformer under the drive of the synchronization signal it receives. data, and forward the synchronization signal and output the encapsulated read data; and the analog channel of the electronic transformer calibrator 500 is connected to the reference output port of the power frequency proportional power supply for receiving the reference signal, the digital channel of the electronic transformer calibrator 500 is connected to the data output end of the protocol converter 400 for receiving the encapsulated read data; the electronic The type transformer calibrator 500 compares and calculates its own error information according to the encapsulated read data and the reference signal it receives. In this embodiment, the electronic transformer calibrator 500 can also display measurement error information, the error information includes the phase error and ratio between the analog reference voltage or current signal and the digital measured voltage or current signal or amplitude error. In this embodiment, the data is transmitted through a data channel or a data port, and the signal in this embodiment refers to a synchronization signal. Transmission through a signal channel or a signal port belongs to common knowledge in the art, and is not discussed here. Repeat.

To sum up, in this embodiment, by using the internal time base (the above-mentioned synchronization signal) of the high-precision digital multimeter 200 as the clock of the entire calibration system, the time base jitter can be controlled within 50ps. , the sampling phase noise can be reduced by at least three orders of magnitude, which greatly reduces the measurement uncertainty of the calibration system, that is, the present embodiment reduces the jitter of the sampling clock, thereby improving the accuracy of the electronic transformer calibrator ( level of accuracy). From this, it can be further seen that this embodiment solves the inherent defects of low measurement accuracy and large jitter of sampling data of the traditional electronic transformer calibrator inspection system, and truly realizes the traceability system of the electronic transformer calibration system. On this basis, a benchmark for high-voltage digital signal transmission can be established, providing reliable technical support for the grading application of electronic transformers in smart substations.

Further, the reference signal is a standard current signal or a standard voltage signal; the measured signal is a voltage or current signal with a preset ratio error and phase error superimposed on the basis of the reference signal; the ratio Error and phase error are the ratio error and phase error between the reference signal and the measured signal set according to the range of the electronic transformer calibrator 500 .

It can be seen from this that it is convenient to compare the error information of the electronic transformer calibrator to be verified (the error information of the electronic transformer calibrator described above) with the ratio error and phase error to obtain the calibration result. That is to compare the error information displayed by the electronic transformer calibrator with the ratio error and phase error between the reference signal preset by the power frequency proportional power supply 100 and the measured signal to obtain the Accuracy class for electronic transformer calibrators. It can be seen from this that the calibration system provided by this embodiment compares with the preset error data (ratio error and phase error between the preset reference signal and the measured signal), and The error data corresponds to an actual value or a theoretical value, so that it can improve the accuracy of the calibration of the electronic transformer calibrator.

Preferably, in this embodiment, the DC sampling accuracy of the high-precision digital multimeter 200 is above level 0.005. In this way, the purpose of high-precision calibration of the electronic transformer calibrator of class 0.05 or 0.02 can be achieved.

Preferably, in this embodiment, the high-precision digital multimeter 200 uses the DCV acquisition mode to collect the measured signal (voltage or current with a preset ratio error and phase error superimposed on the reference signal). signal), since the high-precision digital multimeter 200 adopts the DCV acquisition mode to collect the measured signal with higher sampling accuracy, it can be seen that it can further realize the calibration of the electronic transformer of class 0.05 or 0.02 The purpose of the instrument for high-precision calibration.

Preferably, in this embodiment, the measured signal stored by the high-precision digital multimeter 200 is digital sampling point data. That is, the sampling time and sampling point can be determined by the high-precision digital multimeter 200, and the measured signal can be collected all the time according to the determined sampling point, so as to obtain the digital sampling point data, and output the synchronization signal at the same time. . Therefore, the calibration process of the electronic transformer calibrator can be simulated, and the calibration accuracy of the electronic transformer calibrator of grade 0.05 or 0.02 can be further improved.

Preferably, in this embodiment, the reading module 300 is a real-time synchronization acquisition card, and the real-time synchronization acquisition card can receive the synchronization signal generated by the high-precision digital multimeter 200, and drive the synchronization signal In this way, the measured signal stored in the high-precision digital multimeter 200 and obtained through its collection, that is, the sampling point data of the digital quantity, can be read, and the sampled data of the digital quantity read by it can be read. The point data and the synchronization signal it receives are forwarded or transmitted to the protocol converter 400, respectively.

Preferably, in this embodiment, the protocol converter 400 is a high-speed protocol converter, and may also be any other device that can receive the synchronization signal and convert the digital data into the digital signal under the drive or control of the synchronization signal. The sampling point data can be encapsulated or packaged into a related device or component or module that satisfies the standard protocol format of the electronic transformer transmission protocol, which is not limited in the present invention.

Preferably, in this embodiment, the accuracy level of the power frequency proportional power supply is above level 0.2. It can be seen that since the accuracy level of the power frequency proportional power supply reaches above level 0.2 (relative to 0.2% of the measured accuracy level), it can further improve the accuracy of the electronic transformer calibrator of level 0.05 or 0.02. The precision with which the calibration is performed.

Preferably, in this embodiment, the synchronization signal is a TTL pulse output signal.

Preferably, in this embodiment, the standard protocol format is the standard digital output protocol format of the IEC61850-9-2 format, the IEC61850-9-2LE format, or the FT3 format. That is, the protocol converter 400 can receive the synchronization signal, and under the drive or control of the synchronization signal, encapsulate or package the digital sampling point data into IEC61850-9 that satisfies the transmission protocol of electronic transformers -2 format or digital frame specified by IEC61850-9-2LE or FT3.

The working principle of the inspection system for an electronic transformer calibrator provided by the utility model is as follows: the power frequency proportional power supply 100 is used to output the reference signal and the measured signal respectively; the high-precision digital multimeter 200 is used to The measured signal is collected to obtain digital sampling point data and stored, and the high-precision digital multimeter 200 also generates a synchronization signal and outputs it to the reading module 300 while collecting the measured signal; The reading module 300 receives the synchronization signal, and reads the digital sampling point data stored in the high-precision digital multimeter 200 under the driving of the synchronization signal, and reads the data obtained by the reading module 300. The digital sampling point data is output to the protocol converter (high-speed protocol converter) 400, and at the same time, the reading module 300 also forwards the synchronization signal to the protocol converter 400; the protocol converter 400 receives the synchronization signal, and under the drive of the synchronization signal, encapsulates the received digital sampling point data into data with a standard protocol format that satisfies the transmission protocol of the electronic transformer, and outputs it to the receiver. The digital channel of the calibrated electronic transformer calibrator 500, and at the same time forward the synchronization signal to the calibrated electronic transformer calibrator 500; the calibrated electronic transformer calibrator The analog channel of the tester 500 receives the reference signal, and compares and calculates the received reference signal with the encapsulated digital sampling point data input by the digital channel. The type transformer calibrator 500 obtains the measurement error information.

It can be seen from this that this embodiment solves the inherent defects of low measurement accuracy and large jitter of sampling data of the traditional electronic transformer calibrator inspection system, and truly realizes the traceability system of the electronic transformer calibration system. The benchmark of high-voltage digital signal transmission can be established on the above, which provides reliable technical support for the grading application of electronic transformers in smart substations.

Further, the reference signal is a standard current signal or a voltage signal; the measured signal is a voltage or current signal superimposed with a preset ratio error and phase error on the basis of the reference signal; the ratio error The sum phase error is the ratio error and phase error between the reference signal and the measured signal set according to the range of the electronic transformer calibrator.

Further, it also includes: comparing the error information of the electronic transformer calibrator to be calibrated with the ratio error and phase error to obtain a calibration result, which can calibrate the electronic transformer of class 0.02. instrument for calibration. Specifically, the error information displayed by the electronic transformer calibrator is compared with the ratio error and phase error between the reference signal preset by the power frequency proportional power supply 100 and the measured signal, Obtain the accuracy level of the electronic transformer calibrator. It can be seen from this that in this embodiment, by comparing the error information displayed by the electronic transformer calibrator with the preset error data (the ratio error between the preset reference signal and the measured signal) Compared with the phase error), the error data is equivalent to the actual value or the theoretical value, so that it can improve the accuracy of the calibration of the electronic transformer calibrator.

In summary, the present utility model provides an inspection system for an electronic transformer calibrator, which is used for calibrating an electronic transformer calibrator, including: a power frequency proportional power supply, which is used to generate and output A reference signal and a signal under test; a high-precision digital multimeter, which is used to collect and store the signal under test, and at the same time, generate and output a synchronization signal; a reading module, which is used for driving the received synchronization signal , read the measured signal stored by the high-precision digital multimeter to obtain read data, and forward the synchronization signal and output the read data; a protocol converter, which is used in the received data Driven by the synchronization signal, encapsulate the received read data into data that meets the standard protocol format of the electronic transformer transmission protocol, and forward the synchronization signal and output the encapsulated read data; And the analog channel of the electronic transformer calibrator is connected to the reference output port of the power frequency proportional power supply for receiving the reference signal, and the digital channel of the electronic transformer calibrator is connected to the reference value output port of the power frequency proportional power supply. A data output end of the protocol converter is connected for receiving the encapsulated read data; the electronic transformer calibrator is based on the encapsulated read data and The reference signal is compared and calculated to obtain its own error information. Therefore, the present invention adopts the internal time base (the above-mentioned synchronization signal) of the high-precision digital multimeter as the clock of the entire calibration system, and the time base jitter can be controlled within 50ps. The sampling phase noise is reduced by at least three orders of magnitude, which greatly reduces the measurement uncertainty of the inspection system, that is, the present utility model reduces the jitter of the sampling clock, thereby improving the precision (accuracy) of the electronic transformer calibrator. grade). From this, it can be further known that the utility model solves the inherent defects of low measurement accuracy and large jitter of sampling data of the traditional electronic transformer calibrator inspection system, and truly realizes the traceability system of the electronic transformer calibration system. On this basis, a benchmark for high-voltage digital signal transmission can be established (a high-voltage digital traceability system with the highest national accuracy level can be established), and reliable technical support is provided for the hierarchical application of electronic transformers in smart substations.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integration; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features The features are not in direct contact but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The above are only the preferred embodiments of the present invention, and do not have any limiting effect on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed by the present invention. The content of the technical solution still falls within the protection scope of the present invention.

Claims (10)

1. The utility model provides an integrity check system of electronic transformer calibrator which is used for verifying electronic transformer calibrator which characterized in that includes:

the power frequency proportional power supply is used for generating and outputting a reference signal and a measured signal;

the high-precision digital multimeter is used for acquiring and storing the measured signal and generating and outputting a synchronous signal;

the reading module is used for reading the tested signal stored by the high-precision digital multimeter to obtain read data under the driving of the received synchronous signal, forwarding the synchronous signal and outputting the read data;

the protocol converter is used for packaging the received read data into data meeting a standard protocol format of an electronic transformer transmission protocol under the driving of the received synchronous signal, forwarding the synchronous signal and outputting the packaged read data;

an analog quantity channel of the electronic transformer calibrator is connected with a reference quantity output port of the power frequency proportional power supply and used for receiving the reference signal, and a digital quantity channel of the electronic transformer calibrator is connected with a data output end of the protocol converter and used for receiving the packaged read data; and the electronic transformer calibrator compares and calculates the received packaged read data and the reference signal to obtain error information of the electronic transformer calibrator.

2. The proof inspection system of an electronic transformer calibrator as claimed in claim 1, wherein the reference signal is a standard current signal or a voltage signal; the measured signal is a voltage or current signal superposed with a preset ratio error and a preset phase error on the basis of the reference signal; the ratio error and the phase error are the ratio error and the phase error between the reference signal and the measured signal which are set according to the measuring range of the electronic transformer calibrator.

3. The system for the integral inspection of the electronic transformer calibrator as recited in claim 1, wherein the direct current sampling precision of the high-precision digital multimeter reaches more than 0.005 level.

4. The system for the integral inspection of the electronic transformer calibrator as recited in any one of claims 1 to 3, wherein the high-precision digital multimeter acquires the signal to be tested in a DCV acquisition mode.

5. The integrity inspection system of the electronic transformer calibrator as claimed in claim 4, wherein said reading module is a real-time synchronous acquisition card.

6. The integrity inspection system of an electronic transformer calibrator as recited in claim 4, wherein the power frequency proportional power supply has an accuracy rating of at least 0.2.

7. The proof inspection system of electronic transformer calibrator of claim 6, wherein said high precision digital multimeter is connected to said reading module using a GPIB bus.

8. The proof system of claim 7, wherein said synchronization signal is a TT L pulse output signal.

9. The system for integrity check of an electronic transformer verifier as claimed in claim 8, wherein the standard protocol format is a standard digital output protocol format of IEC61850-9-2 format or IEC 61850-9-2L E format or FT3 format.

10. The system for integrity checking an electronic transformer calibrator as recited in claim 9, wherein said signal under test stored by said high-precision digital multimeter is digital sample point data.

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