CN106646321A - DC current transformer synchronous calibration method and system - Google Patents
DC current transformer synchronous calibration method and system Download PDFInfo
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- CN106646321A CN106646321A CN201611033200.2A CN201611033200A CN106646321A CN 106646321 A CN106646321 A CN 106646321A CN 201611033200 A CN201611033200 A CN 201611033200A CN 106646321 A CN106646321 A CN 106646321A
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a DC current transformer synchronous calibration method and system. The method comprises the following steps: receiving a standard analog current value and a standard analog voltage value of a standard DC current comparator; at the same time, receiving the analog voltage value and the analog current value of a calibrated DC current transformer; obtaining the DC current value of the calibrated DC current transformer; calibrating the DC current transformer according to the analog voltage value and the analog current value, the standard analog voltage value, the standard analog current value and a digital current value; and evaluating the precision of the calibrated DC current transformer according to a calibration result. The method uses the analog voltage value, the analog current value and the digital current value to carry out synchronous measurement and calibration, uses a high-stability DC current source and a high-precision standard DC comparator to ensure the accuracy of calibration, and is high in calibration stability so as to improve the ability of field tests of the DC current transformer.
Description
Technical field
The present invention relates to DC current transformer on-the-spot test field, more particularly to a kind of DC current transformer synchronization school
Quasi- method and system.
Background technology
In power system, in order to ensure the safety of normal power supply and protection expensive equipment, there is a set of by various relays
The relay protection circuit of device control device composition.When breaking down in power system, these protection devices will action, cut-out
The circuit of failure, if accidental failure, additionally it is possible to automatic closing, it is ensured that normal power supply.DC current transformer is direct current
The capital equipment of DC voltage is measured in transmission system, the safe and stable operation for DC transmission system provides control and protects.For
Ensure DC current transformer measurement signal accurately and reliably, need to carry out field calibration to DC current transformer.
When carrying out field calibration, traditional DC current transformer control calibration steps is directly applied to DC high voltage
The high-pressure side of tested DC current transformer and standard voltage divider；Tested DC current transformer and standard voltage divider are in low-pressure end
Output low-voltage signal, secondary measuring system synchronizes collection, measurement to the low-voltage signal for exporting, and according to standard voltage divider
Marked ratio, obtains the actual no-load voltage ratio of tested DC current transformer.By the way that the low voltage value of actual measurement is converted by rated voltage ratio
For high tension voltage value.Itself error of this transducer check method is directly superimposed among the error of standard mutual inductor, while
The components and parts error of mutual-inductor tester limits the precision that traditional DC current transformer controls calibration steps.For example,
One mutual-inductor tester is limited due to itself components and parts, and its measure error limit value is ± 0.05%, even if using higher accurate
The standard mutual inductor of degree, also can only be used for examining and determine the transformer of less than 0.5 grade rank.Thus, this shortcoming is limited directly
The range of application of comparison expression mutual-inductor tester.
With increasing for domestic high voltage direct current transmission project, new requirement is proposed to the verification of direct current instrument transformer, and
Write direct current instrument transformer field-checking code related to calibration test and technical standard.Traditional DC current transformer control school
Quasi- method can not meet direct current instrument transformer field-checking code related to calibration test to accurately requirement.
The content of the invention
The goal of the invention of the present invention is to provide a kind of DC current transformer scene closed-loop control calibration steps and system,
It is low to solve the problems, such as existing DC current transformer control calibration steps precision.
Embodiment of the present invention first aspect illustrates a kind of DC current transformer synchronous calibration method, including：
The master die analog quantity current value and master die analog quantity magnitude of voltage of reception standard comparator for direct current；
Meanwhile, acceptance is aligned stream current transformer analog quantity voltage value and analog quantity current value；
The digital quantity current value of stream current transformer is aligned described in obtaining；
According to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity current value and
Digital quantity current value, calibrates to the DC current transformer, according to calibration result, stream electric current is aligned described in evaluation mutual
The precision of sensor.
Further, according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity
Current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, are aligned described in evaluation
The precision of stream current transformer, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity current value is extracted, direct current master die analog quantity current value is obtained；
The constant current component of digital quantity current value is extracted, DC digital amount current value is obtained；
According to the DC analogue quantity magnitude of voltage and the direct current master die analog quantity current value, analog quantity ratio mistake is calculated
Difference；
According to the standard DC analogue quantity current value and the DC digital amount current value, digital quantity ratio mistake is calculated
Difference；
According to the analog quantity ratio error or digital quantity ratio error, the essence of stream current transformer is aligned described in evaluation
Accuracy.
Further, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity current value and digital quantity current value,
The DC current transformer is calibrated, according to calibration result, the precision of stream current transformer is aligned described in evaluation,
Including：
According to the analog quantity voltage value and the master die analog quantity magnitude of voltage, the analog quantity voltage value and institute are calculated
State the variance of master die analog quantity magnitude of voltage；Wherein described analog quantity voltage value be different time points record be aligned stream electric current it is mutual
The array of sensor analog quantity voltage value；The master die analog quantity magnitude of voltage is the standard DC comparator mark of different time points record
The array of quasi-mode analog quantity magnitude of voltage；
Calculated according to the variance, the precision of stream current transformer is aligned described in evaluation.
Further, according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity
Current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, are aligned described in evaluation
The precision of stream current transformer, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity magnitude of voltage is extracted, direct current master die analog quantity magnitude of voltage is obtained；
Draw DC analogue quantity magnitude of voltage oscillogram at different frequencies；
Draw standard DC analogue quantity magnitude of voltage oscillogram at different frequencies；
According to DC analogue quantity magnitude of voltage oscillogram at different frequencies and the standard DC analogue quantity voltage
The matching degree of value oscillogram at different frequencies, evaluates the precision for being aligned and flowing current transformer.
Further, the constant current component for extracting the analog quantity voltage value is that fourier conversion method extracts the analog quantity electricity
Pressure value DC analogue quantity magnitude of voltage at different frequencies.
Second aspect present invention illustrates a kind of DC current transformer synchronous calibration system, and the system includes：
DC current source, the DC current source is used to export constant current value；
Being aligned stream current transformer is used to export analog quantity voltage value and analog quantity current value；
Standard DC comparator is used for the master die analog quantity current value and standard analog of outputting standard comparator for direct current
Amount magnitude of voltage；
Data signal converting unit is used to for analog quantity current value to be converted into digital quantity current value；
DC electronic transformer tester is used for according to the analog quantity voltage value, analog quantity current value, standard analog
Amount magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, according to calibration to the DC current transformer
As a result, the precision of stream current transformer is aligned described in evaluating.
Further, the system also includes analog acquisition interface unit；
The analog acquisition interface unit is used to adopt analog quantity voltage value and the master die analog quantity magnitude of voltage
Collection filtering process, extraction standard DC analogue quantity magnitude of voltage and DC analogue quantity magnitude of voltage.
Further, the system also includes digital quantity interface；
The digital quantity interface is used to be acquired digital quantity current value filtering process, extracts the perseverance of digital quantity current value
Flow component, obtains DC digital amount current value.
Further, DC electronic transformer tester exports method using the light second.
From above technical scheme, the present invention illustrates a kind of DC current transformer synchronous calibration method and system, its
Described in method include：The master die analog quantity current value and master die analog quantity magnitude of voltage of reception standard comparator for direct current；Together
When, acceptance is aligned stream current transformer analog quantity voltage value and analog quantity current value；Stream Current Mutual Inductance is aligned described in obtaining
The digital quantity current value of device；According to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, standard analog
Amount current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, evaluate described by school
The precision of DC current transformer.This method adopts analog quantity voltage value, analog quantity current value and digital quantity current value to carry out
Synchronous measurement calibration, using the DC current source of high stability, High-precision standard DC comparator, using exact time synchronization
Mode carries out the demarcation of signals collecting, it is ensured that the precision of calibration, and interference-free effect of signals can be prevented effectively from sampling substep school
The delay difference that standard is caused to be aligned stream current transformer precision impact；Simultaneously the calibration steps stability is high, enters
And improve the ability of DC current transformer field test.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing that needs are used is briefly described, it should be apparent that, drawings in the following description are only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can be being obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is to be preferable to carry out a kind of DC current transformer synchronous calibration method flow diagram for exemplifying according to one；
Fig. 2 is the structured flowchart according to an a kind of DC current transformer synchronous calibration device for being preferable to carry out exemplifying.
Marginal data：201- DC current sources；202- is aligned stream current transformer；203- standard DC comparators；
204- data signal converting units；205- precision resisters；206- analog acquisition interface units；207- digital quantity interfaces；
208- DC electronic transformer testers.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Whole description, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
First aspect present invention illustrates a kind of DC current transformer synchronous calibration method, as shown in figure 1, methods described bag
Include following steps：
S101 receives the master die analog quantity current value and master die analog quantity magnitude of voltage of standard comparator for direct current；
Simultaneously, acceptance is aligned stream current transformer analog quantity voltage value and analog quantity current value to S102；
S103 is aligned the digital quantity current value for flowing current transformer described in obtaining；
S104 is according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity electric current
Value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, stream electricity are aligned described in evaluation
The precision of current transformer.
Specifically, it is described to be aligned stream current transformer 202 and standard DC comparator 203 while accessing DC current source
201, it is aligned stream current transformer 202 output analog quantity voltage value and analog quantity current value, DC electronic transformer verification
Instrument 208 is received by analog acquisition interface unit 206 and is aligned the stream analog quantity voltage value of current transformer 202 and analog quantity electricity
Flow valuve, the magnitude of voltage of the output of standard DC comparator 203 is converted into master die analog quantity magnitude of voltage and mould by precision resister 203
Analog quantity current value, DC electronic transformer tester 208 receives master die analog quantity electricity by analog acquisition interface unit 206
Pressure value, DC electronic transformer tester 208 is according to analog quantity voltage value, analog quantity current value, master die analog quantity current value
The precision for being aligned stream current transformer 202 is evaluated with master die analog quantity magnitude of voltage；
The stream analog quantity current value of current transformer 202 is aligned simultaneously, and number is converted into by data signal converting unit 204
Word amount current value, DC electronic transformer tester 208 receives digital quantity current value by digital quantity interface 207.Direct current
Minor mutual-inductor tester 208 is aligned stream current transformer 202 according to digital quantity current value and analog quantity current value to described
Precision evaluated.
This method is calibrated using the measurement that analog quantity voltage value analog quantity electric current and digital quantity current value are synchronized, and can be had
Imitate to avoid sampling the delay difference that causes of step calibration to being aligned the impact of the precision of stream current transformer 202；While institute
State calibration steps stability high, and then improve the ability of DC current transformer field test.
Further according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity electricity
Flow valuve and digital quantity current value, calibrate to the DC current transformer, according to calibration result, described in evaluation stream are aligned
The precision of current transformer, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity current value is extracted, direct current master die analog quantity current value is obtained；
The constant current component of digital quantity current value is extracted, DC digital amount current value is obtained；
According to the DC analogue quantity magnitude of voltage and the direct current master die analog quantity current value, analog quantity ratio mistake is calculated
Difference；
According to the standard DC analogue quantity current value and the DC digital amount current value, digital quantity ratio mistake is calculated
Difference；
According to the analog quantity ratio error or digital quantity ratio error, the essence of stream current transformer is aligned described in evaluation
Accuracy.
Calculated according to the variance, the precision of stream current transformer is aligned described in evaluation.
Specifically, this method is by calculating the analog quantity ratio error digital quantity ratio error, by ratio error come
The precision of stream current transformer is aligned described in evaluating.
The ratio error for being aligned stream current transformer analog quantity is calculated as：
Wherein, K is to be aligned the nominal transformation ratio for flowing current transformer, UpTo be aligned stream current transformer DC analogue quantity
Magnitude of voltage, IBStandard DC comparator direct current master die analog quantity current value；
It is aligned stream current transformer digital quantity ratio error to be calculated as：
Wherein, Ic flows current transformer DC digital amount current value, I to be alignedBFor standard DC comparator direct current mark
Quasi-mode analog quantity current value.
The precision of stream current transformer 202 specifically can be aligned according to integrating system evaluation, concrete operations are by by school
The full marks of the precision of DC current transformer 202 are set to 100 points, calculate the simulation for being aligned and flowing current transformer 202
Amount ratio error and digital quantity ratio error, and according to the value of analog quantity ratio error and digital quantity ratio error come to precision
Deducted points, finally again by score value judge be aligned stream current transformer 202 precision.
Further, according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity
Current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, are aligned described in evaluation
The precision of stream current transformer, including：
According to the analog quantity voltage value and the master die analog quantity magnitude of voltage, the analog quantity voltage value and institute are calculated
State the variance of master die analog quantity magnitude of voltage；Wherein described analog quantity voltage value be different time points record be aligned stream electric current it is mutual
The array of sensor analog quantity voltage value；The master die analog quantity magnitude of voltage is the standard DC comparator mark of different time points record
The array of quasi-mode analog quantity magnitude of voltage；
Calculated according to the variance, the precision of stream current transformer 202 is aligned described in evaluation.
Concrete evaluation method can be aligned the precision of stream current transformer 202, concrete operations according to integrating system evaluation
It is that the full marks of the precision for being aligned stream current transformer 202 are set to into 100 points, according to variance yields is calculated, precision is entered
Row deduction of points, finally again by score value judge be aligned stream current transformer 202 precision.
Further, according to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity
Current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, are aligned described in evaluation
The precision of stream current transformer, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity magnitude of voltage is extracted, direct current master die analog quantity magnitude of voltage is obtained；
Draw DC analogue quantity magnitude of voltage oscillogram at different frequencies；
Draw standard DC analogue quantity magnitude of voltage oscillogram at different frequencies；
According to DC analogue quantity magnitude of voltage oscillogram at different frequencies and the standard DC analogue quantity voltage
The matching degree of value oscillogram at different frequencies, evaluates the precision for being aligned and flowing current transformer.
Concrete evaluation method can be aligned the precision of stream current transformer 202, concrete operations according to integrating system evaluation
It is that the full marks of the precision for being aligned stream current transformer 202 are set to into 100 points, according to the matching degree of waveform, to precision
Deducted points, finally again by score value judge be aligned stream current transformer 202 precision.
Further, the constant current component for extracting the analog quantity voltage value is that fourier conversion method extracts the analog quantity electricity
Pressure value DC analogue quantity magnitude of voltage at different frequencies.
Second aspect present invention illustrates a kind of DC current transformer synchronous calibration system, as shown in Fig. 2 the system bag
Include：
DC current source 201, the DC current source 201 is used to export constant current value；
Being aligned stream current transformer 202 is used to export analog quantity voltage value；
Precision resister 205 is used to for master die analog quantity magnitude of voltage to be converted into master die analog quantity current value；
Standard DC comparator 203 is used for outputting standard analog quantity current value and master die analog quantity magnitude of voltage；
Data signal converting unit 204 is used to for analog quantity current value to be converted into digital quantity current value；
DC electronic transformer tester 208 is used for according to the analog quantity voltage value, analog quantity current value, master die
Analog quantity magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, according to school to the DC current transformer
Quasi- result, evaluates the precision for being aligned and flowing current transformer 202.
Specifically, the signal of standard DC comparator 203 is the benchmark of precision checking test, and it is straight that it takes from High-precision standard
The analog quantity voltage value of the stream output of current source 201；Standard analog is converted into through the master die analog quantity magnitude of voltage of precision resister 205
Amount current value, master die analog quantity magnitude of voltage and master die analog quantity magnitude of voltage are connected to analog acquisition interface unit 206.It is aligned stream
The signal of the output of current transformer 202 can be IEC61850-9-1 digital output formulas, IEC61850-9-2 digital outputs
Formula, FT3 digital output formulas etc..Analog quantity voltage value signal is connected to another input port of analog acquisition interface unit 206.Respectively
Class digital quantity current value, signal is connected to DC electronic transformer check meter through digital quantity interface 207 using Ethernet interface
208.Standard DC comparator 203 is acquired under control of the synchronization signal with the signal for being aligned stream current transformer 202,
With the delay difference for avoiding asynchronous sampling from causing.Simultaneously the system of the present invention, can complete direct current electronic voltage transformer
Than difference verification, combination misalignment, frequency measurement verification precision dependence test.Be provided simultaneously with test item protocol conformance analysis,
The functions such as waveform drawing, waveform analysis, report generation.The system is synchronized using analog quantity voltage value and digital quantity current value
Measurement calibration, effectively the accurate of current transformer 202 can be flowed to being aligned with the delay difference that causes of step calibration that avoids sampling
The impact of degree；Simultaneously the calibration steps stability is high, and then improves the ability of DC current transformer field test.
Further, the system also includes that the system also includes analog acquisition interface unit 206；
The analog acquisition interface unit 206 is used to carry out analog quantity voltage value and the master die analog quantity magnitude of voltage
Collection filtering process, extraction standard DC analogue quantity magnitude of voltage and DC analogue quantity magnitude of voltage.
Further, the system also includes digital quantity interface 207；
The digital quantity interface 207 is used to be acquired digital quantity current value filtering process, extracts digital quantity current value
Constant current component, obtain DC digital amount current value.
Further, DC electronic transformer tester 208 exports method using the light second.
Specifically, the synchronizing signal of check system is exported using standard compliant smooth pulse per second (PPS) and IRIG-B.It is of the invention real
Example is applied for precision time service, introduces light pps pulse per second signal rising edge to indicate whole moment second of UTC (Coordinated Universal Time(UTC)), precision can
To arrive nanosecond, and without accumulated error；IRIG-B：The synchronization accuracy of IRIG-B is up to tens nanosecond orders.
From above technical scheme, the present invention illustrates a kind of DC current transformer synchronous calibration method and system, its
Described in method include：The master die analog quantity current value and master die analog quantity magnitude of voltage of reception standard comparator for direct current；Together
When, acceptance is aligned the stream analog quantity voltage value of current transformer 202 and analog quantity current value；Stream electric current is aligned described in obtaining mutual
The digital quantity current value of sensor 202；According to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, standard
Analog quantity current value and digital quantity current value, calibrate to the DC current transformer, according to calibration result, evaluate described
It is aligned the precision of stream current transformer 202.This method adopts analog quantity voltage value, analog quantity current value and digital quantity electric current
The measurement calibration that value is synchronized, using the DC current source 201 of high stability, High-precision standard DC comparator 203, adopts
Exact time synchronization mode carries out the demarcation of signals collecting, it is ensured that the precision of calibration, interference-free effect of signals can effectively keep away
Exempt to sample the delay difference that causes of step calibration to being aligned the impact of the precision of stream current transformer 202；The calibration simultaneously
Method stability is high, and then improves the ability of DC current transformer field test.
Those skilled in the art will readily occur to its of the present invention after considering specification and putting into practice invention disclosed herein
Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and
And can without departing from the scope carry out various modifications and changes.The scope of the present invention is only limited by appended claim.
Claims (9)
1. a kind of DC current transformer synchronous calibration method, it is characterised in that include：
The master die analog quantity current value and master die analog quantity magnitude of voltage of reception standard comparator for direct current；
Meanwhile, acceptance is aligned stream current transformer analog quantity voltage value and analog quantity current value；
The digital quantity current value of stream current transformer is aligned described in obtaining；
According to the analog quantity voltage value, analog quantity current value, master die analog quantity magnitude of voltage, master die analog quantity current value and numeral
Amount current value, calibrates to the DC current transformer, according to calibration result, described in evaluation stream current transformer is aligned
Precision.
2. method according to claim 1, it is characterised in that according to the analog quantity voltage value, analog quantity current value, mark
Quasi-mode analog quantity magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, root to the DC current transformer
According to calibration result, the precision of stream current transformer is aligned described in evaluation, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity current value is extracted, direct current master die analog quantity current value is obtained；
The constant current component of digital quantity current value is extracted, DC digital amount current value is obtained；
According to the DC analogue quantity magnitude of voltage and the direct current master die analog quantity current value, analog quantity ratio error is calculated；
According to the standard DC analogue quantity current value and the DC digital amount current value, digital quantity ratio error is calculated；
According to the analog quantity ratio error or digital quantity ratio error, the accurate of stream current transformer is aligned described in evaluation
Degree.
3. method according to claim 1, it is characterised in that according to the analog quantity voltage value, analog quantity current value, mark
Quasi-mode analog quantity magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, root to the DC current transformer
According to calibration result, the precision of stream current transformer is aligned described in evaluation, including：
According to the analog quantity voltage value and the master die analog quantity magnitude of voltage, the analog quantity voltage value and the mark are calculated
The variance of quasi-mode analog quantity magnitude of voltage；Wherein described analog quantity voltage value is aligned stream current transformer for different time points record
The array of analog quantity voltage value；The master die analog quantity magnitude of voltage is the standard DC comparator master die of different time points record
The array of analog quantity magnitude of voltage；
According to the variance, the precision of stream current transformer is aligned described in evaluation.
4. method according to claim 1, it is characterised in that according to the analog quantity voltage value, analog quantity current value, mark
Quasi-mode analog quantity magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, root to the DC current transformer
According to calibration result, the precision of stream current transformer is aligned described in evaluation, including：
The constant current component of the analog quantity voltage value is extracted, DC analogue quantity magnitude of voltage is obtained；
The constant current component of the master die analog quantity magnitude of voltage is extracted, direct current master die analog quantity magnitude of voltage is obtained；
Draw DC analogue quantity magnitude of voltage oscillogram at different frequencies；
Draw standard DC analogue quantity magnitude of voltage oscillogram at different frequencies；
Existed according to DC analogue quantity magnitude of voltage oscillogram at different frequencies and the standard DC analogue quantity magnitude of voltage
The matching degree of the oscillogram under different frequency, evaluates the precision for being aligned and flowing current transformer.
5. method according to claim 4, it is characterised in that the constant current component of the extraction analog quantity voltage value is
Fourier conversion method extracts analog quantity voltage value DC analogue quantity magnitude of voltage at different frequencies.
6. a kind of DC current transformer synchronous calibration system, it is characterised in that the system includes：
DC current source, is aligned stream current transformer, precision resister, standard DC comparator, data signal converting unit
With DC electronic transformer tester；
The DC current source is used to export constant current value；
The stream current transformer that is aligned is used to export analog quantity voltage value and analog quantity current value；
The precision resister is used to for master die analog quantity magnitude of voltage to be converted into master die analog quantity current value；
The standard DC comparator is used for outputting standard analog quantity voltage value；
The data signal converting unit is used to for analog quantity current value to be converted into digital quantity current value；
The DC electronic transformer tester is used for according to the analog quantity voltage value, analog quantity current value, standard analog
Amount magnitude of voltage, master die analog quantity current value and digital quantity current value, calibrate, according to calibration to the DC current transformer
As a result, the precision of stream current transformer is aligned described in evaluating.
7. system according to claim 6, it is characterised in that the system also includes analog acquisition interface unit；
The analog acquisition interface unit is used to be acquired filter to analog quantity voltage value and the master die analog quantity magnitude of voltage
Ripple process, extraction standard DC analogue quantity magnitude of voltage and DC analogue quantity magnitude of voltage.
8. system according to claim 6, it is characterised in that the system also includes digital quantity interface；
The digital quantity interface is used to be acquired digital quantity current value filtering process, extracts the constant current point of digital quantity current value
Amount, obtains DC digital amount current value.
9. system according to claim 6, it is characterised in that DC electronic transformer tester is exported using the light second
Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033200.2A CN106646321B (en) | 2016-11-18 | 2016-11-18 | Synchronous calibration method and system for direct current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611033200.2A CN106646321B (en) | 2016-11-18 | 2016-11-18 | Synchronous calibration method and system for direct current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106646321A true CN106646321A (en) | 2017-05-10 |
| CN106646321B CN106646321B (en) | 2023-10-27 |
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Cited By (5)
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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 |
| CN108776319A (en) * | 2018-04-25 | 2018-11-09 | 中国电力科学研究院有限公司 | A kind of optical fiber current mutual inductor data accuracy self-diagnosing 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 |
| 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 |
| 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 |
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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 |
| CN108776319A (en) * | 2018-04-25 | 2018-11-09 | 中国电力科学研究院有限公司 | A kind of optical fiber current mutual inductor data accuracy self-diagnosing 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 |
| 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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