CN106772189B - Synchronous calibration method and system for direct-current voltage transformer - Google Patents
Synchronous calibration method and system for direct-current voltage transformer Download PDFInfo
- Publication number
- CN106772189B CN106772189B CN201611032653.3A CN201611032653A CN106772189B CN 106772189 B CN106772189 B CN 106772189B CN 201611032653 A CN201611032653 A CN 201611032653A CN 106772189 B CN106772189 B CN 106772189B
- Authority
- CN
- China
- Prior art keywords
- voltage value
- analog
- current
- voltage
- straightened
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 9
- 230000009466 transformation Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000011426 transformation method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The application discloses a synchronous calibration method and a synchronous calibration system for a direct-current voltage transformer, wherein the method comprises the following steps: receiving a standard analog voltage value of a standard direct current voltage divider; meanwhile, receiving analog voltage values of the straightened current voltage transformer; acquiring a digital secondary voltage value of the straightened current voltage transformer; calculating the primary voltage value of the straightened current voltage transformer digital quantity according to the digital quantity secondary voltage value; and calibrating the direct-current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct-current voltage transformer according to a calibration result. According to the method, synchronous measurement calibration is carried out on the analog voltage value and the digital secondary voltage value which are output by the straightened current voltage divider, and the accuracy of the straightened current voltage transformer is comprehensively evaluated according to the calibration result.
Description
Technical Field
The application relates to the field of field test of direct-current voltage transformers, in particular to a synchronous calibration method and system of a direct-current voltage 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 voltage transformer is a main device for measuring direct-current voltage in the direct-current power transmission system, and provides control and protection for safe and stable operation of the direct-current power transmission system. In order to ensure the accuracy and reliability of the measurement signals of the direct-current voltage transformer, the direct-current voltage transformer needs to be calibrated on site.
When in field calibration, the traditional direct-current voltage transformer control calibration method directly applies direct-current high voltage to the high-voltage ends of the tested direct-current voltage transformer and the standard voltage divider; the tested direct current voltage 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 voltage 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 voltage 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 voltage transformer control calibration method cannot meet the requirement of the direct-current transformer on-site calibration and calibration test related regulations 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 voltage transformer, which are used for solving the problem of low accuracy of the existing method for controlling and calibrating the direct-current voltage transformer.
The first aspect of the embodiment of the application shows a synchronous calibration method for a direct-current voltage transformer, which comprises the following steps:
receiving a standard analog voltage value of a standard direct current voltage divider;
meanwhile, receiving analog voltage values of the straightened current voltage transformer;
acquiring a digital secondary voltage value of the straightened current voltage transformer;
calculating the primary voltage value of the straightened current voltage transformer digital quantity according to the digital quantity secondary voltage value;
and calibrating the direct-current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct-current voltage transformer according to a calibration result.
Further, according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, evaluating the accuracy of the straightened current voltage transformer includes:
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;
extracting constant current components of the digital secondary voltage value to obtain a direct current digital secondary voltage value;
calculating a direct current digital quantity primary voltage value according to the direct current digital quantity secondary voltage value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity voltage value;
calculating the digital quantity ratio error of the straightened DC voltage transformer according to the DC digital quantity secondary voltage value and the DC digital quantity primary voltage measurement value;
and evaluating the accuracy of the straightened current voltage transformer according to the analog quantity ratio error and the digital quantity ratio error.
Further, according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, evaluating the accuracy of the straightened current voltage transformer includes:
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 voltage transformer recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of the standard direct current voltage transformer recorded at different time points;
and evaluating the accuracy of the straightened current voltage transformer according to the variance calculation.
Further, according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, evaluating the accuracy of the straightened current voltage transformer includes:
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 voltage 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 direct current voltage transformer synchronous calibration system, the system comprising:
the direct-current voltage source is used for outputting a constant voltage value;
the straightened current voltage transformer is used for outputting an analog voltage value;
the standard direct current voltage divider is used for receiving a constant voltage value and outputting a standard analog quantity voltage value through the analog signal conversion unit;
the digital signal conversion unit is used for converting the analog voltage value into a digital secondary voltage value;
the direct current electronic transformer calibrator is used for calibrating the direct current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct current voltage 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 secondary voltage value, extracting a constant current component of the digital quantity secondary voltage value and obtaining a direct current digital quantity secondary voltage 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 dc voltage transformer, wherein the method includes: receiving a standard analog voltage value of a standard direct current voltage divider; meanwhile, receiving analog voltage values of the straightened current voltage transformer; acquiring a digital secondary voltage value of the straightened current voltage transformer; calculating the digital primary voltage value of the straightened current voltage transformer according to the digital secondary voltage value; and calibrating the direct-current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct-current voltage transformer according to a calibration result. The method adopts the analog voltage value and the digital secondary voltage value to carry out synchronous measurement and calibration, utilizes a constant voltage source with high stability and a high-precision standard direct current voltage divider to carry out signal acquisition calibration in a precise time synchronization mode, and ensures the calibration accuracy to be free from the influence of interference signals. The influence of delay difference caused by sampling step-by-step calibration on the precision of the straightened current voltage transformer is effectively avoided; meanwhile, the calibrating method is high in stability, and further the capability of the DC voltage transformer on-site 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 voltage transformer according to a preferred embodiment;
fig. 2 is a block diagram showing a synchronous calibration device for a dc voltage transformer according to a preferred embodiment.
Legend description: 201-a direct current voltage source; 202-a straightened-flow voltage transformer; 203-a standard dc voltage divider; 204-a digital signal conversion unit; 205-an analog signal conversion unit; 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 voltage transformer, as shown in fig. 1, the method includes the following steps:
s101, receiving a standard analog voltage value of a standard direct current voltage divider;
s102, receiving analog voltage values of the straightened current voltage transformer;
s103, acquiring a digital secondary voltage value of the straightened current voltage transformer;
s104, calculating the digital primary voltage value of the straightened current voltage transformer according to the digital secondary voltage value;
s105, calibrating the direct-current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct-current voltage transformer according to a calibration result.
Specifically, the straightened dc voltage transformer 202 and the standard dc voltage divider 203 are connected to a dc power supply at the same time, the straightened dc voltage transformer 202 has an analog voltage value, the dc electronic transformer calibrator 208 receives the analog voltage value of the straightened dc voltage transformer 202 through the analog acquisition interface unit 206, the voltage value output by the standard dc voltage divider 203 is converted into a standard analog voltage value through the analog signal conversion unit 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 dc voltage transformer 202 according to the analog voltage value and the standard analog voltage value;
meanwhile, the analog value of the straightened current voltage transformer 202 is converted into a digital value secondary voltage value through the digital signal conversion unit 204, the digital value secondary voltage value is received by the direct current electronic transformer calibrator 208 through the digital value interface 207, and the digital value primary voltage value of the straightened current voltage transformer 202 is calculated according to the digital value secondary voltage value; the primary voltage value of the digital quantity is calculated according to the primary and secondary transformation ratios of the straightened current voltage transformer 202, which are usually noted in the description of the primary and secondary transformation ratios of the straightened current voltage transformer 202. The dc electronic transformer calibrator 208 evaluates the accuracy of the straightened dc voltage transformer 202 based on the digital secondary voltage value and the digital primary voltage value.
The method adopts the analog voltage value and the digital secondary voltage value to carry out synchronous measurement and calibration, and can effectively avoid the influence of delay difference caused by sampling step-by-step calibration on the precision of the straightened current voltage transformer 202; meanwhile, the calibrating method is high in stability, and further the capability of the DC voltage transformer on-site test is improved.
Further, evaluating the accuracy of the straightened current voltage transformer 202 according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value, and the digital primary voltage value includes:
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;
extracting constant current components of the digital secondary voltage value to obtain a direct current digital secondary voltage value;
calculating a direct current digital quantity primary voltage value according to the direct current digital quantity secondary voltage value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity voltage value;
calculating the digital quantity ratio error of the straightened DC voltage transformer according to the DC digital quantity secondary voltage value and the DC digital quantity primary voltage measurement value;
and evaluating the accuracy of the straightened current voltage transformer according to the analog quantity ratio error and the digital quantity ratio error.
And evaluating the accuracy of the straightened current voltage transformer according to the variance calculation. Specifically, the method evaluates the accuracy of the straightened current voltage transformer through calculating the analog quantity ratio error and the digital quantity ratio error and the ratio error.
The ratio error of the analog quantity of the straightened current voltage transformer 202 is calculated as:
wherein K is the rated transformation ratio of the straightened current voltage transformer, U B U is the DC analog voltage value of the straightened DC voltage transformer P The standard DC voltage divider is used for DC standard analog voltage value;
the digital value ratio error of the straightened current voltage transformer is calculated as follows:
wherein K is P For a nominal transformation ratio of a standard DC voltage divider, U P U is the secondary voltage value of the direct current digital quantity of the straightened current voltage transformer B The DC digital value of the straightened DC voltage transformer is one voltage measurement value.
The method specifically comprises the steps of evaluating the accuracy of the straightened current voltage transformer 202 according to an integral system, setting the full division of the accuracy of the straightened current voltage transformer 202 as 100 minutes, calculating the analog quantity ratio error and the digital quantity ratio error of the straightened current voltage 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 voltage transformer 202 according to the score value.
Further, evaluating the accuracy of the straightened current voltage transformer 202 according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value, and the digital primary voltage value includes:
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 voltage transformer 202 recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of the standard direct current voltage transformer recorded at different time points;
and evaluating the accuracy of the straightened current voltage transformer 202 according to the variance calculation.
The specific evaluation method can evaluate the accuracy of the straightened current voltage transformer 202 according to an integral system, specifically comprises the steps of setting the full division of the accuracy of the straightened current voltage transformer 202 as 100 minutes, deducting the accuracy according to the calculated variance value, and finally judging the accuracy of the straightened current voltage transformer 202 according to the score value.
Further, evaluating the accuracy of the straightened current voltage transformer 202 according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value, and the digital primary voltage value includes:
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 voltage transformer 202 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 voltage transformer 202 according to an integral system, specifically comprises the steps of setting the full division of the accuracy of the straightened current voltage transformer 202 as 100 minutes, matching the waveforms, deducting the accuracy, and finally judging the accuracy of the straightened current voltage transformer 202 according to the 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 voltage transformer, as shown in fig. 2, the system comprising:
a dc voltage source 201, where the dc voltage source 201 is configured to output a constant voltage value;
the straightened current voltage transformer 202 is used for outputting analog voltage values of the analog-to-digital signal conversion unit 204;
the standard dc voltage divider 203 is configured to receive a constant voltage value, and output a standard analog voltage value through the analog signal conversion unit 205;
the digital signal conversion unit 204 is configured to convert the analog voltage value into a digital secondary voltage value;
the dc electronic transformer calibrator 208 is configured to calibrate the dc voltage transformer according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value, and the digital primary voltage value, and evaluate the accuracy of the straightened dc voltage transformer 202 according to the calibration result.
Specifically, the signal of the standard dc voltage divider 203 is a reference for the accuracy test, and is taken from the analog voltage value output by the high-accuracy standard dc proportioner, and the standard analog voltage value is connected to the analog acquisition interface unit 206. The signal output by the straightened current voltage transformer 202 may be: analog quantity output type, IEC61850-9-1 digital quantity output type, IEC61850-9-2 digital quantity output type, FT3 digital quantity output type, and the like. The analog voltage value signal is connected to another input port of the analog acquisition interface unit 206. Various digital values of the secondary voltage value, the signal is connected to a DC electronic transformer tester 208 through a digital value interface 207 by using an Ethernet port. The signals of the standard dc voltage divider 203 and the straightened dc voltage 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 secondary voltage 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 voltage transformer 202 can be effectively avoided; meanwhile, the calibrating method is high in stability, and further the capability of the DC voltage transformer on-site 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 value interface 207 is used for performing collection filtering processing on the digital value secondary voltage value, extracting a constant current component of the digital value secondary voltage value, and obtaining a direct current digital value secondary voltage 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 dc voltage transformer, wherein the method includes: receiving a standard analog voltage value of a standard direct current voltage divider 203; meanwhile, receiving the analog voltage value of the straightened current voltage transformer 202; acquiring a digital secondary voltage value of the straightened current voltage transformer 202; calculating the primary voltage value of the digital quantity of the straightened current voltage transformer 202 according to the secondary voltage value of the digital quantity; and calibrating the direct current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct current voltage transformer 202 according to a calibration result. The method adopts the analog voltage value and the digital secondary voltage value to carry out synchronous measurement and calibration, adopts a high-stability constant voltage source and a high-precision standard direct current voltage divider 203 to carry out signal acquisition calibration in a precise time synchronization mode, and ensures the calibration accuracy to be not influenced by interference signals. The influence of delay difference caused by sampling step-by-step calibration on the precision of the straightened current voltage transformer 202 is effectively avoided; meanwhile, the calibrating method is high in stability, and further the capability of the DC voltage transformer on-site 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 voltage transformer is characterized by comprising the following steps of:
receiving a standard analog voltage value of a standard direct current voltage divider;
meanwhile, receiving analog voltage values of the straightened current voltage transformer;
acquiring a digital secondary voltage value of the straightened current voltage transformer;
calculating the primary voltage value of the straightened current voltage transformer digital quantity according to the digital quantity secondary voltage value;
calibrating the direct-current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct-current voltage transformer according to a calibration result;
according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value and the digital primary voltage value, the evaluating the accuracy of the straightened current voltage transformer comprises:
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;
extracting constant current components of the digital secondary voltage value to obtain a direct current digital secondary voltage value;
calculating a direct current digital quantity primary voltage value according to the direct current digital quantity secondary voltage value;
calculating an analog quantity ratio error according to the direct current analog quantity voltage value and the direct current standard analog quantity voltage value;
calculating the digital quantity ratio error of the straightened DC voltage transformer according to the DC digital quantity secondary voltage value and the DC digital quantity primary voltage measurement value;
setting the full division of the precision of the straightened current voltage transformer as 100 minutes, calculating the analog quantity ratio error and the digital quantity ratio error of the straightened current voltage transformer, deducting 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 voltage transformer according to the score value;
according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value and the digital primary voltage value, evaluating the accuracy of the straightened current voltage transformer further comprises:
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 voltage transformer recorded at different time points; the standard analog voltage value is an array of standard analog voltage values of the standard direct current voltage transformer recorded at different time points;
according to the variance calculation, evaluating the accuracy of the straightened current voltage transformer;
setting the full division of the precision of the straightened current voltage transformer as 100 minutes, buckling the precision according to the calculated variance value, and finally judging the precision of the straightened current voltage transformer according to the scoring value;
according to the analog voltage value, the standard analog voltage value, the digital secondary voltage value and the digital primary voltage value, evaluating the accuracy of the straightened current voltage transformer further comprises:
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 voltage 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;
setting the full division of the precision of the straightened current voltage transformer to be 100 minutes, buckling the precision according to the matching degree of waveforms, and finally judging the precision of the straightened current voltage 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 by a fourier transform method.
3. A synchronous calibration system for a dc voltage transformer, which is applied to the synchronous calibration method for a dc voltage transformer according to any one of claims 1-2, comprising:
the direct-current voltage source is straightened to a direct-current voltage transformer, a standard direct-current voltage divider, a digital signal conversion unit, a direct-current electronic transformer calibrator and an analog signal conversion unit;
the direct-current voltage source is used for outputting a constant voltage value;
the straightened current voltage transformer is used for outputting an analog voltage value;
the standard direct current voltage divider is used for receiving a constant voltage value and outputting a standard analog voltage value through the analog signal conversion unit;
the digital signal conversion unit is used for converting the analog voltage value into a digital secondary voltage value;
the direct current electronic transformer calibrator is used for calibrating the direct current voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value, and evaluating the accuracy of the straightened direct current voltage 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 secondary voltage value, extracting a constant current component of the digital quantity secondary voltage value and obtaining a direct current digital quantity secondary voltage value.
6. A system according to claim 3, wherein the dc electronic transformer calibrator employs an optical second output method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611032653.3A CN106772189B (en) | 2016-11-18 | 2016-11-18 | Synchronous calibration method and system for direct-current voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611032653.3A CN106772189B (en) | 2016-11-18 | 2016-11-18 | Synchronous calibration method and system for direct-current voltage transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106772189A CN106772189A (en) | 2017-05-31 |
| CN106772189B true CN106772189B (en) | 2023-11-21 |
Family
ID=58971553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611032653.3A Active CN106772189B (en) | 2016-11-18 | 2016-11-18 | Synchronous calibration method and system for direct-current voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106772189B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110826018B (en) * | 2020-01-09 | 2020-04-14 | 四川大学 | Primary signal recovery method and system based on rational function approximation |
Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517106A (en) * | 1989-08-07 | 1996-05-14 | Digital Kwh, Inc. | Method and apparatus for digitally measuring electrical power |
| JP2008292192A (en) * | 2007-05-22 | 2008-12-04 | Nippon Denki Keiki Kenteisho | Transformer tester |
| KR20090014902A (en) * | 2007-08-07 | 2009-02-11 | 엘에스산전 주식회사 | Electricity meter with a function for detecting failure of current transformer |
| KR20100007179A (en) * | 2008-07-11 | 2010-01-22 | 한국표준과학연구원 | Current transformer comparator system |
| CN101672866A (en) * | 2009-09-29 | 2010-03-17 | 北京航空航天大学 | Comprehensive detecting and marking system of Faraday magneto-optical effect current mutual inductor |
| CN101872004A (en) * | 2010-03-04 | 2010-10-27 | 国网电力科学研究院 | Calibrating test device of electronic type transformer checking instrument |
| CN201689168U (en) * | 2010-03-04 | 2010-12-29 | 国网电力科学研究院 | Calibration test device of an electronic transformer calibration instrument |
| RU2410752C1 (en) * | 2009-12-17 | 2011-01-27 | Государственное образовательное учреждение высшего профессионального образования Московский государственный институт электронной техники (технический университет) (МИЭТ) | Method to measure and calculate parametres of electric circuit |
| CN102053235A (en) * | 2010-10-21 | 2011-05-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | On-site steady-state accuracy verification system for electronic current transformer and verification method thereof |
| CN102073028A (en) * | 2010-10-21 | 2011-05-25 | 中国南方电网有限责任公司超高压输电公司柳州局 | Onsite stable state precision calibration system of electronic voltage transformer and calibration method thereof |
| CN102520384A (en) * | 2012-01-05 | 2012-06-27 | 江西省电力科学研究院 | Digital output electronic type mutual inductor conversion time delay test method |
| JP2013053855A (en) * | 2011-08-31 | 2013-03-21 | National Institute Of Advanced Industrial & Technology | Error estimation device for electronic current transformer |
| CN103018704A (en) * | 2012-11-30 | 2013-04-03 | 广州市格宁电气有限公司 | Correction method for instrument voltage transformer |
| CN103439679A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Absolute time delay detection device and method of intelligent substation mutual inductor data collection system |
| WO2014071753A1 (en) * | 2012-11-06 | 2014-05-15 | 国家电网公司 | Electronic transformer calibrator calibration device and method based on digital source |
| CN204256149U (en) * | 2014-11-12 | 2015-04-08 | 国家电网公司 | A kind of Performance Test System of merge cells tester |
| CN104833941A (en) * | 2015-05-26 | 2015-08-12 | 广东电网有限责任公司电力科学研究院 | DC mutual inductor check meter combining analog quantity and digital quantity verification function |
| CN204789972U (en) * | 2015-05-26 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function |
| CN105319528A (en) * | 2015-12-07 | 2016-02-10 | 成都思晗科技股份有限公司 | Method for checking operation working condition of electric energy meter |
| CN105467354A (en) * | 2015-12-07 | 2016-04-06 | 成都思晗科技股份有限公司 | An operation condition examination method for a metering device |
| CN206193226U (en) * | 2016-11-18 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Synchronous calbiration system of direct current voltage transformer |
-
2016
- 2016-11-18 CN CN201611032653.3A patent/CN106772189B/en active Active
Patent Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517106A (en) * | 1989-08-07 | 1996-05-14 | Digital Kwh, Inc. | Method and apparatus for digitally measuring electrical power |
| JP2008292192A (en) * | 2007-05-22 | 2008-12-04 | Nippon Denki Keiki Kenteisho | Transformer tester |
| KR20090014902A (en) * | 2007-08-07 | 2009-02-11 | 엘에스산전 주식회사 | Electricity meter with a function for detecting failure of current transformer |
| KR20100007179A (en) * | 2008-07-11 | 2010-01-22 | 한국표준과학연구원 | Current transformer comparator system |
| CN101672866A (en) * | 2009-09-29 | 2010-03-17 | 北京航空航天大学 | Comprehensive detecting and marking system of Faraday magneto-optical effect current mutual inductor |
| RU2410752C1 (en) * | 2009-12-17 | 2011-01-27 | Государственное образовательное учреждение высшего профессионального образования Московский государственный институт электронной техники (технический университет) (МИЭТ) | Method to measure and calculate parametres of electric circuit |
| CN101872004A (en) * | 2010-03-04 | 2010-10-27 | 国网电力科学研究院 | Calibrating test device of electronic type transformer checking instrument |
| CN201689168U (en) * | 2010-03-04 | 2010-12-29 | 国网电力科学研究院 | Calibration test device of an electronic transformer calibration instrument |
| CN102053235A (en) * | 2010-10-21 | 2011-05-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | On-site steady-state accuracy verification system for electronic current transformer and verification method thereof |
| CN102073028A (en) * | 2010-10-21 | 2011-05-25 | 中国南方电网有限责任公司超高压输电公司柳州局 | Onsite stable state precision calibration system of electronic voltage transformer and calibration method thereof |
| JP2013053855A (en) * | 2011-08-31 | 2013-03-21 | National Institute Of Advanced Industrial & Technology | Error estimation device for electronic current transformer |
| CN102520384A (en) * | 2012-01-05 | 2012-06-27 | 江西省电力科学研究院 | Digital output electronic type mutual inductor conversion time delay test method |
| WO2014071753A1 (en) * | 2012-11-06 | 2014-05-15 | 国家电网公司 | Electronic transformer calibrator calibration device and method based on digital source |
| CN103018704A (en) * | 2012-11-30 | 2013-04-03 | 广州市格宁电气有限公司 | Correction method for instrument voltage transformer |
| CN103439679A (en) * | 2013-08-28 | 2013-12-11 | 国家电网公司 | Absolute time delay detection device and method of intelligent substation mutual inductor data collection system |
| CN204256149U (en) * | 2014-11-12 | 2015-04-08 | 国家电网公司 | A kind of Performance Test System of merge cells tester |
| CN104833941A (en) * | 2015-05-26 | 2015-08-12 | 广东电网有限责任公司电力科学研究院 | DC mutual inductor check meter combining analog quantity and digital quantity verification function |
| CN204789972U (en) * | 2015-05-26 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Direct current instrument trans former check gauge of compatible analog quantity and digital quantity check -up function |
| CN105319528A (en) * | 2015-12-07 | 2016-02-10 | 成都思晗科技股份有限公司 | Method for checking operation working condition of electric energy meter |
| CN105467354A (en) * | 2015-12-07 | 2016-04-06 | 成都思晗科技股份有限公司 | An operation condition examination method for a metering device |
| CN206193226U (en) * | 2016-11-18 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Synchronous calbiration system of direct current voltage transformer |
Non-Patent Citations (4)
| Title |
|---|
| Current transformer calibration using synchronous sampling;Lapuh, R等;《2002 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS》;全文 * |
| Prediction and research on transformer fault based on the bow tie and semi-Markov model;Shen Xin等;《 Chinese Journal of Electron Devices》;第38卷(第6期);全文 * |
| 张杰 ; 胡媛媛 ; 刘飞 ; 姚翔宇 ; 姚俊 ; .高压直流互感器现场校验关键技术.高电压技术.2016,(第09期),全文. * |
| 李冬芳 ; .电子式互感器的校验方法.电器工业.2013,(第11期),第69-71页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106772189A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106646321B (en) | Synchronous calibration method and system for direct current transformer | |
| CN106772198B (en) | Method, system and device for testing transient response characteristics of direct current transformer | |
| CN101526562B (en) | Distributed wireless high-voltage equipment insulating live testing system and testing method | |
| CN206193226U (en) | Synchronous calbiration system of direct current voltage transformer | |
| CN102012494B (en) | Transformer calibrator and calibration method thereof | |
| Tang et al. | Calibration of phasor measurement unit at NIST | |
| CN101762799B (en) | System for online detection of voltage transformer precision | |
| CN106154202B (en) | A kind of calibration method of electrical short-circuit testing ＆ measuring system | |
| WO2018018467A1 (en) | Method for calibrating short circuit test measurement system for electric appliance | |
| CN206161830U (en) | Synchronous calbiration system of direct current transformer | |
| CN109212459A (en) | It is a kind of for carrying out the method and system of whole inspection to DC mutual inductor verification instrument | |
| CN106772189B (en) | Synchronous calibration method and system for direct-current voltage transformer | |
| CN202939299U (en) | Electronic transformer calibration device based on synchronous pulse output power supply | |
| CN103823198A (en) | Relay protection testing device time measurement accuracy degree detection system and method | |
| CN106054000A (en) | Interval merging unit power factor angle consistency on-site test system and method | |
| Kitzig et al. | Evaluation of power quality measurement system concept using an experimental setup | |
| CN210347905U (en) | System for be used for carrying out whole system of examining to direct current transformer check gauge | |
| CN108710095B (en) | Impulse voltage generator calibrating device based on linearity analysis | |
| Chen et al. | Traceable calibration system for non-conventional current sensors with analogue or digital output | |
| Braun | Measure of the absolute phase angle of a power frequency sinewave with respect to UTC | |
| CN113884966B (en) | AC/DC sensor broadband calibrator and performance detection calibration method thereof | |
| Lixia et al. | Application of IEEE 1588 to the measurement of synchrophasors in electric power systems | |
| CN205844509U (en) | A kind of phase error detecting apparatus of electronic transducer calibration instrument | |
| Gunnarsson et al. | A method for calibration of partial discharge calibrators | |
| CN112162226B (en) | Measurement characteristic separation testing device and method and terminal equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |