CN106646321B - Synchronous calibration method and system for direct current transformer - Google Patents
Synchronous calibration method and system for direct current transformer Download PDFInfo
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- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The application discloses a synchronous calibration method and system for a direct current transformer, wherein the method comprises the following steps: receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator; meanwhile, receiving analog voltage value and analog current value of the straightened current transformer; acquiring a digital quantity current value of the straightened current transformer; and calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to the calibration result. The method adopts the analog voltage value, the analog current value and the digital current value to carry out synchronous measurement and calibration, and utilizes the direct current source with high stability and the high-precision standard direct current comparator to ensure the calibration accuracy, and meanwhile, the calibration method has high stability, thereby improving the field test capability of the direct current transformer.
Description
Technical Field
The application relates to the field of direct current transformer field test, in particular to a synchronous calibration method and system for a direct current transformer.
Background
In the power system, in order to ensure normal power supply and protect the safety of valuable equipment, a relay protection circuit consisting of various relay control devices is arranged. When faults occur in the power system, the protection devices act to cut off the faulty line, and if the fault happens, the protection devices can be automatically switched on to ensure normal power supply. The direct current transformer is a main device for measuring direct current voltage in the direct current transmission system, and provides control and protection for safe and stable operation of the direct current transmission system. In order to ensure the accuracy and reliability of the measurement signals of the direct current transformer, the direct current transformer needs to be calibrated in site.
When in field calibration, the traditional direct current transformer control calibration method directly applies direct current high voltage to the high voltage ends of the tested direct current transformer and the standard voltage divider; the tested direct current transformer and the standard voltage divider output low-voltage signals at the low-voltage end, the secondary measurement system synchronously collects and measures the output low-voltage signals, and the actual transformation ratio of the tested direct current transformer is obtained according to the nominal transformation ratio of the standard voltage divider. The measured low voltage value is converted into a high voltage value by a rated voltage ratio. The error of the transformer calibration method is directly superimposed into the error of a standard transformer, and meanwhile, the component error of the transformer calibrator limits the accuracy of the traditional direct current transformer control calibration method. For example, due to the limitation of components, the measurement error limit value of the transformer calibrator is +/-0.05%, and even if a standard transformer with higher accuracy is adopted, the transformer calibrator can only be used for calibrating transformers with the level below 0.5. Thus, this disadvantage limits the range of applications for direct-comparison transformer checkmeters.
With the increase of domestic high-voltage direct current transmission engineering, new requirements are put forward on the verification of the direct current transformer, and relevant regulations and technical standards of the on-site verification and calibration test of the direct current transformer are written. The traditional direct current transformer control calibration method can not meet the requirement of the related regulations of the on-site calibration and calibration test of the direct current transformer on accuracy.
Disclosure of Invention
The application aims to provide a method and a system for on-site closed-loop control and calibration of a direct current transformer, which are used for solving the problem of low accuracy of the existing direct current transformer control and calibration method.
The first aspect of the embodiment of the application shows a synchronous calibration method for a direct current transformer, which comprises the following steps:
receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator;
meanwhile, receiving analog voltage value and analog current value of the straightened current transformer;
acquiring a digital quantity current value of the straightened current transformer;
and calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result.
Further, according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, calibrating the direct current transformer, and according to the calibration result, evaluating the accuracy of the straightened direct current transformer, including:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog current value to obtain a direct current standard analog current value;
extracting a constant current component of the digital quantity current value to obtain a direct current digital quantity current value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity current value;
calculating a digital quantity ratio error according to the standard direct current analog quantity current value and the direct current digital quantity current value;
and evaluating the accuracy of the straightened current transformer according to the analog quantity ratio error or the digital quantity ratio error.
Further, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value calibrate the direct current transformer, and according to the calibration result, evaluate the accuracy of the straightened direct current transformer, including:
calculating the variances of the analog quantity voltage value and the standard analog quantity voltage value according to the analog quantity voltage value and the standard analog quantity voltage value; the analog voltage value is an array of analog voltage values of the straightened current transformer recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of a standard direct current comparator recorded at different time points;
and evaluating the accuracy of the straightened current transformer according to the variance calculation.
Further, according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, calibrating the direct current transformer, and according to the calibration result, evaluating the accuracy of the straightened direct current transformer, including:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog voltage value to obtain a direct current standard analog voltage value;
drawing waveform diagrams of the direct current analog voltage values under different frequencies;
drawing waveform diagrams of the standard direct current analog voltage values under different frequencies;
and evaluating the accuracy of the straightened DC current transformer according to the matching degree of the waveform diagram of the DC analog voltage value under different frequencies and the waveform diagram of the standard DC analog voltage value under different frequencies.
Further, the constant current component for extracting the analog voltage value is a direct current analog voltage value of the analog voltage value under different frequencies extracted by a Fourier transformation method.
A second aspect of the application shows a synchronous calibration system for a direct current transformer, the system comprising:
the direct current source is used for outputting a constant current value;
the straightened current transformer is used for outputting an analog voltage value and an analog current value;
the standard direct current comparator is used for outputting a standard analog quantity current value and a standard analog quantity voltage value of the standard direct current comparator;
the digital signal conversion unit is used for converting the analog quantity current value into a digital quantity current value;
the direct current electronic transformer calibrator is used for calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result.
Further, the system also comprises an analog quantity acquisition interface unit;
the analog quantity acquisition interface unit is used for carrying out acquisition and filtering processing on the analog quantity voltage value and the standard analog quantity voltage value, and extracting the standard direct current analog quantity voltage value and the direct current analog quantity voltage value.
Further, the system also includes a digital quantity interface;
the digital quantity interface is used for carrying out acquisition and filtering processing on the digital quantity current value, extracting constant current components of the digital quantity current value and obtaining a direct current digital quantity current value.
Further, the direct current electronic transformer calibrator adopts an optical second output method.
As can be seen from the above technical solutions, the present application provides a method and a system for synchronously calibrating a direct current transformer, wherein the method includes: receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator; meanwhile, receiving analog voltage value and analog current value of the straightened current transformer; acquiring a digital quantity current value of the straightened current transformer; and calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result. The method adopts the analog voltage value, the analog current value and the digital current value to carry out synchronous measurement and calibration, adopts a direct current source with high stability and a high-precision standard direct current comparator to carry out signal acquisition calibration in an accurate time synchronization mode, ensures the calibration accuracy, is not influenced by interference signals, and can effectively avoid the influence of delay difference caused by sampling step calibration on the accuracy of the straightened current transformer; meanwhile, the calibration method is high in stability, and further the capability of the DC current transformer in-situ test is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for synchronous calibration of a DC current transformer according to a preferred embodiment;
fig. 2 is a block diagram showing a synchronous calibration device for a dc current transformer according to a preferred embodiment.
Legend description: 201-a direct current source; 202-a straightened-current transformer; 203-a standard dc comparator; 204-a digital signal conversion unit; 205-high precision resistance; 206, an analog quantity acquisition interface unit; 207-digital quantity interface; 208-a direct current electronic transformer calibrator.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The first aspect of the present application shows a synchronous calibration method for a direct current transformer, as shown in fig. 1, the method includes the following steps:
s101, receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator;
s102, simultaneously, receiving analog voltage value and analog current value of the straightened current transformer;
s103, acquiring a digital quantity current value of the straightened current transformer;
s104, calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result.
Specifically, the straightened current transformer 202 and the standard dc comparator 203 are connected to the dc current source 201 at the same time, the straightened current transformer 202 outputs an analog voltage value and an analog current value, the dc electronic transformer calibrator 208 receives the analog voltage value and the analog current value of the straightened current transformer 202 through the analog acquisition interface unit 206, the voltage value output by the standard dc comparator 203 is converted into a standard analog voltage value and an analog current value through the high-precision resistor 203, the dc electronic transformer calibrator 208 receives the standard analog voltage value through the analog acquisition interface unit 206, and the dc electronic transformer calibrator 208 evaluates the accuracy of the straightened current transformer 202 according to the analog voltage value, the analog current value, the standard analog current value and the standard analog voltage value;
meanwhile, the analog quantity current value of the straightened current transformer 202 is converted into a digital quantity current value through the digital signal conversion unit 204, and the digital quantity current value is received by the direct current electronic transformer calibrator 208 through the digital quantity interface 207. The dc electronic transformer calibrator 208 evaluates the accuracy of the straightened dc current transformer 202 based on the digital and analog current values.
The method adopts the analog voltage value, the analog current and the digital current value to carry out synchronous measurement and calibration, so that the influence of delay difference caused by sampling step-by-step calibration on the precision of the straightened current transformer 202 can be effectively avoided; meanwhile, the calibration method is high in stability, and further the capability of the DC current transformer in-situ test is improved.
Further according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, calibrating the direct current transformer, and according to the calibration result, evaluating the accuracy of the straightened direct current transformer, comprising:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog current value to obtain a direct current standard analog current value;
extracting a constant current component of the digital quantity current value to obtain a direct current digital quantity current value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity current value;
calculating a digital quantity ratio error according to the standard direct current analog quantity current value and the direct current digital quantity current value;
and evaluating the accuracy of the straightened current transformer according to the analog quantity ratio error or the digital quantity ratio error.
And evaluating the accuracy of the straightened current transformer according to the variance calculation.
Specifically, the method evaluates the accuracy of the straightened current transformer by calculating the analog quantity ratio error and the digital quantity ratio error and by the ratio error.
The ratio error of the analog quantity of the straightened current transformer is calculated as follows:
wherein K is the rated transformation ratio of the straightened current transformer, U p I is the DC analog voltage value of the straightened DC current transformer B A standard DC comparator DC standard analog current value;
the digital value ratio error of the straightened current transformer is calculated as follows:
wherein Ic is the direct current digital value of the straightened current transformer, I B The DC standard analog current value is the standard DC comparator DC standard analog current value.
The method specifically comprises the steps of evaluating the accuracy of the straightened current transformer 202 according to an integral system, setting the full division of the accuracy of the straightened current transformer 202 as 100 minutes, calculating the analog quantity ratio error and the digital quantity ratio error of the straightened current transformer 202, deducting the accuracy according to the values of the analog quantity ratio error and the digital quantity ratio error, and finally judging the accuracy of the straightened current transformer 202 according to the score value.
Further, according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, calibrating the direct current transformer, and according to the calibration result, evaluating the accuracy of the straightened direct current transformer, including:
calculating the variances of the analog quantity voltage value and the standard analog quantity voltage value according to the analog quantity voltage value and the standard analog quantity voltage value; the analog voltage value is an array of analog voltage values of the straightened current transformer recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of a standard direct current comparator recorded at different time points;
and evaluating the accuracy of the straightened current transformer 202 according to the variance calculation.
The specific evaluation method can evaluate the accuracy of the straightened current transformer 202 according to an integral system, specifically comprises the steps of setting the full division of the accuracy of the straightened current transformer 202 as 100 minutes, deducting the accuracy according to the calculated variance value, and finally judging the accuracy of the straightened current transformer 202 according to the score value.
Further, according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, calibrating the direct current transformer, and according to the calibration result, evaluating the accuracy of the straightened direct current transformer, including:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog voltage value to obtain a direct current standard analog voltage value;
drawing waveform diagrams of the direct current analog voltage values under different frequencies;
drawing waveform diagrams of the standard direct current analog voltage values under different frequencies;
and evaluating the accuracy of the straightened DC current transformer according to the matching degree of the waveform diagram of the DC analog voltage value under different frequencies and the waveform diagram of the standard DC analog voltage value under different frequencies.
The specific evaluation method can evaluate the accuracy of the straightened current transformer 202 according to an integral system, specifically comprises the steps of setting the full division of the accuracy of the straightened current transformer 202 as 100 minutes, deducting the accuracy according to the matching degree of waveforms, and finally judging the accuracy of the straightened current transformer 202 according to a score value.
Further, the constant current component for extracting the analog voltage value is a direct current analog voltage value of the analog voltage value under different frequencies extracted by a Fourier transformation method.
A second aspect of the present application shows a synchronous calibration system for a dc current transformer, as shown in fig. 2, the system comprising:
a direct current source 201, the direct current source 201 being configured to output a constant current value;
the straightened current transformer 202 is used for outputting analog voltage values;
the high-precision resistor 205 is used for converting a standard analog voltage value into a standard analog current value;
the standard direct current comparator 203 is used for outputting a standard analog current value and a standard analog voltage value;
the digital signal conversion unit 204 is configured to convert an analog current value into a digital current value;
the dc electronic transformer calibrator 208 is configured to calibrate the dc current transformer according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value, and the digital current value, and evaluate the accuracy of the straightened dc current transformer 202 according to the calibration result.
Specifically, the signal of the standard dc comparator 203 is a reference for the precision calibration test, and is taken from the analog voltage value output by the high-precision standard dc current source 201; the standard analog voltage value is converted into a standard analog current value through the high-precision resistor 205, and the standard analog voltage value are connected to the analog acquisition interface unit 206. The signal output by the straightened current transformer 202 may be IEC61850-9-1 digital output, IEC61850-9-2 digital output, FT3 digital output, etc. The analog voltage value signal is connected to another input port of the analog acquisition interface unit 206. The various digital current values, signals are connected to a DC electronic transformer tester 208 through a digital interface 207 by using an Ethernet port. The signals of the standard dc comparator 203 and the straightened dc current transformer 202 are collected under the control of the synchronization signal to avoid delay differences caused by unsynchronized sampling. Meanwhile, the system can finish the correlation tests of the comparison error, the compound error and the frequency measurement calibration accuracy of the direct-current electronic voltage transformer. Meanwhile, the system has the functions of protocol consistency analysis, waveform drawing, waveform analysis, report generation and the like of the tested product. The system adopts the analog voltage value and the digital current value to carry out synchronous measurement and calibration, so that the influence of delay difference caused by sampling step-by-step calibration on the accuracy of the straightened current transformer 202 can be effectively avoided; meanwhile, the calibration method is high in stability, and further the capability of the DC current transformer in-situ test is improved.
Further, the system further comprises an analog acquisition interface unit 206;
the analog acquisition interface unit 206 is configured to perform an acquisition filtering process on the analog voltage value and the standard analog voltage value, and extract a standard dc analog voltage value and a dc analog voltage value.
Further, the system also includes a digital quantity interface 207;
the digital quantity interface 207 is used for performing collection and filtering processing on the digital quantity current value, extracting a constant current component of the digital quantity current value, and obtaining a direct current digital quantity current value.
Further, the dc electronic transformer calibrator 208 employs an optical second output method.
Specifically, the synchronous signal of the verification system adopts light second pulse and IRIG-B output which meet the standards. In order to precisely time, the embodiment of the application introduces the rising edge of the optical second pulse signal to mark the whole second moment of UTC (coordinated universal time), the precision can reach nanosecond level, and no accumulated error exists; IRIG-B: the IRIG-B synchronization accuracy can reach tens of nanoseconds.
As can be seen from the above technical solutions, the present application provides a method and a system for synchronously calibrating a direct current transformer, wherein the method includes: receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator; meanwhile, receiving analog voltage value and analog current value of the straightened current transformer 202; acquiring a digital value of the straightened current transformer 202; and calibrating the direct current transformer according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and evaluating the accuracy of the straightened direct current transformer 202 according to the calibration result. The method adopts the analog voltage value, the analog current value and the digital current value to carry out synchronous measurement and calibration, adopts a high-stability direct current source 201 and a high-precision standard direct current comparator 203 to carry out signal acquisition calibration in an accurate time synchronization mode, ensures the calibration accuracy, is not influenced by interference signals, and can effectively avoid the influence of delay difference caused by sampling step calibration on the accuracy of the straightened current transformer 202; meanwhile, the calibration method is high in stability, and further the capability of the DC current transformer in-situ test is improved.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (6)
1. The synchronous calibration method for the direct current transformer is characterized by comprising the following steps of:
receiving a standard analog quantity current value and a standard analog quantity voltage value of a standard direct current comparator;
meanwhile, receiving analog voltage value and analog current value of the straightened current transformer;
acquiring a digital quantity current value of the straightened current transformer;
calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result;
calibrating the direct current transformer according to the analog voltage value, the analog current value, the standard analog voltage value, the standard analog current value and the digital current value, and evaluating the accuracy of the straightened direct current transformer according to the calibration result, comprising:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog current value to obtain a direct current standard analog current value;
extracting a constant current component of the digital quantity current value to obtain a direct current digital quantity current value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity current value;
calculating a digital quantity ratio error according to the standard direct current analog quantity current value and the direct current digital quantity current value;
according to the analog quantity ratio error and the digital quantity ratio error, evaluating the accuracy of the straightened current transformer;
according to the analog quantity ratio error and the digital quantity ratio error, evaluating the accuracy of the straightened current transformer comprises the following steps:
setting full division of the precision of the straightened current transformer, buckling the precision according to the values of the analog quantity ratio error and the digital quantity ratio error, and finally judging the precision of the straightened current transformer according to the scoring value;
calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to the calibration result, and further comprising:
calculating the variances of the analog quantity voltage value and the standard analog quantity voltage value according to the analog quantity voltage value and the standard analog quantity voltage value; the analog voltage value is an array of analog voltage values of the straightened current transformer recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of a standard direct current comparator recorded at different time points;
according to the variance calculation, evaluating the accuracy of the straightened current transformer;
according to the variance calculation, evaluating the accuracy of the straightened current transformer comprises the following steps:
setting full division of the accuracy of the straightened current transformer, buckling the accuracy according to the variance value, and finally judging the accuracy of the straightened current transformer according to the scoring value;
calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to the calibration result, and further comprising:
extracting a constant current component of the analog voltage value to obtain a direct current analog voltage value;
extracting a constant current component of the standard analog voltage value to obtain a direct current standard analog voltage value;
drawing waveform diagrams of the direct current analog voltage values under different frequencies;
drawing waveform diagrams of the standard direct current analog voltage values under different frequencies;
evaluating the accuracy of the straightened DC current transformer according to the matching degree of the waveform diagram of the DC analog voltage value under different frequencies and the waveform diagram of the standard DC analog voltage value under different frequencies;
according to the matching degree of the waveform diagram of the DC analog voltage value under different frequencies and the waveform diagram of the standard DC analog voltage value under different frequencies, the precision evaluation of the straightened DC current transformer comprises the following steps:
setting full division of the accuracy of the straightened current transformer, buckling the accuracy according to the matching degree of the waveform diagram, and finally judging the accuracy of the straightened current transformer by the score value.
2. The method of claim 1, wherein the extracting the constant current component of the analog voltage value is extracting the direct current analog voltage value of the analog voltage value at different frequencies for fourier transform.
3. A synchronous calibration system for a direct current transformer, the system employing the method of claim 1, the system comprising:
the direct current source is used for outputting a constant current value;
the straightened current transformer is used for outputting an analog voltage value and an analog current value;
the high-precision resistor is used for converting the standard analog voltage value into a standard analog current value;
the standard direct current comparator is used for outputting a standard analog voltage value;
the high-precision resistor is used for converting the standard analog voltage value into a standard analog current value;
the digital signal conversion unit is used for converting the analog quantity current value into a digital quantity current value;
the direct current electronic transformer calibrator is used for calibrating the direct current transformer according to the analog quantity voltage value, the analog quantity current value, the standard analog quantity voltage value, the standard analog quantity current value and the digital quantity current value, and evaluating the accuracy of the straightened direct current transformer according to a calibration result.
4. A system according to claim 3, further comprising an analog acquisition interface unit;
the analog quantity acquisition interface unit is used for carrying out acquisition and filtering processing on the analog quantity voltage value and the standard analog quantity voltage value, and extracting the standard direct current analog quantity voltage value and the direct current analog quantity voltage value.
5. The system of claim 3, further comprising a digital quantity interface;
the digital quantity interface is used for carrying out acquisition and filtering processing on the digital quantity current value, extracting constant current components of the digital quantity current value and obtaining a direct current digital quantity current value.
6. A system according to claim 3, wherein the dc electronic transformer calibrator employs an optical second output method.
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| CN107505587A (en) * | 2017-09-30 | 2017-12-22 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of divider check system and method for calibration |
| CN108776319B (en) * | 2018-04-25 | 2022-11-08 | 中国电力科学研究院有限公司 | Optical fiber current transformer data accuracy self-diagnosis method and system |
| CN110780257A (en) * | 2019-12-02 | 2020-02-11 | 国网河北省电力有限公司电力科学研究院 | Direct current transformer detection system and detection method based on standard source |
| CN111490786B (en) * | 2020-05-28 | 2023-12-29 | 上海金脉汽车电子有限公司 | Calibration method and device of digital-to-analog converter |
| CN114442020A (en) * | 2020-11-06 | 2022-05-06 | 余姚市嘉荣电子电器有限公司 | Leakage protector calibration method |
| CN112379324A (en) * | 2020-11-30 | 2021-02-19 | 国网河北省电力有限公司营销服务中心 | Step response detection system of direct current transformer based on steepening leading edge current source |
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