CN104330677B - A kind of electronic current mutual inductor experimental rig and test method - Google Patents
A kind of electronic current mutual inductor experimental rig and test method Download PDFInfo
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- CN104330677B CN104330677B CN201410658751.2A CN201410658751A CN104330677B CN 104330677 B CN104330677 B CN 104330677B CN 201410658751 A CN201410658751 A CN 201410658751A CN 104330677 B CN104330677 B CN 104330677B
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Abstract
The present invention relates to a kind of electronic current mutual inductor experimental rig and test method.Apparatus of the present invention include standard current transformer, electronic current mutual inductor to be measured, digital mutual inductor tester, strong current generator, combining unit, digital relay protection tester, test main frame, impulse voltage generator, impulse voltage divider, industrial frequency withstand voltage machine, peak value meter, variable-frequency power sources, PD meter and industrial frequency withstand voltage partial volume device.Communication united test process after the present invention is connected to the separate test procedure before electronic current mutual inductor to be measured installation and with transformer respectively using the device is monitored, and independent experiment is carried out again to the current transformer after united test, judged whether by experimental phenomena and result of the test by each process of the test.The various complex environments that scene occurs in present invention simulation hanging net operation, are detected to electronic current mutual inductor performance, be that the reliable calibrating of electronic mutual inductor provides safeguard, the quality of electronic mutual inductor product is controlled from source.
Description
Technical field
It is installed in power transformer and is carried out with power transformer comprising electronic current mutual inductor the present invention relates to one kind
The electronic current mutual inductor experimental rig and test method of communication united test, belong to current transformer experimental technique field.
Background technology
As State Grid Corporation of China builds the proposition of strong intelligent grid, applied to the various equipment in power system
Develop to intelligent direction, and electronic current mutual inductor is done due to its small volume, lightweight, excellent insulating property, anti-electromagnetism
Disturb that ability is strong, be easy to implement the series of advantages such as intellectuality, be widely used in power system.Intelligent substation is
The important component of intelligent grid, and the application of electronic current mutual inductor is that intelligent substation primary equipment is intelligentized heavy
One of indicate.The fast development of intelligent substation, has promoted the progress of the practical and commercialization of electronic current mutual inductor.
Compared with conventional current transformer, electronic current mutual inductor complex structure, by accurate optics or electricity device
Composition, the principle of induction and sensing arrangement of the two is entirely different, therefore when electronic current mutual inductor is installed on power transformer
When, current existing traditional content of the test and test method have not been applied to.Current national standard, professional standard are also not yet right
This makes stipulations.According to GB/T20840.8-2007 standards provide, only clearly to electronic current mutual inductor with matched transformer
Close using front and rear, electronic current mutual inductor should keep normal output state, but do not suggest that specific experimental rig and
Test method；The electronic current mutual inductor performance detection scheme that State Grid Corporation of China formulates is also only for independent electronic type electricity
Current transformer is carried out, and the test method for electronic current mutual inductor not being installed on to the communication joint debugging after transformer makes rule
It is fixed.But see false is alert, signal is interrupted suddenly etc. often occur according to the live hanging net operation result of current electronic current mutual inductor
A series of problems, one of reason is exactly when carrying out Performance Assessment to electronic current mutual inductor, not by electronic current mutual inductor
It is installed on the practical operation situation after power transformer included.
To ensure power system reliability service, accelerate to promote the unified strong intelligent grid construction of China, design a kind of electronics
Formula current transformer and power transformer bulk testing method, comprehensive effective detection electronic current mutual inductor are installed on change
The problem of performance after depressor turns into urgent need to resolve.
The content of the invention
Regarding to the issue above, the invention provides a kind of Integrated test facility comprising communication united test and method, make
Obtain under the various extremely complicated environment that scene occurs in simulation hanging net operation, carry out electronic current mutual inductor performance detection,
Using its result of the test as whether meet GB/T20840.8-2007 requirement content of examination, be electronic current mutual inductor whether
Meet hanging net operation condition and effective reference is provided.
Electronic current mutual inductor experimental rig of the present invention, including
Standard current transformer, for exporting high-precision current signal to digital mutual inductor tester, is used as standard
Value；
Electronic current mutual inductor to be measured, is connected with instrument successively by test requirements document, carries out every experiment；
Digital mutual inductor tester, for the output of standard current transformer and electronic current mutual inductor to be measured to be believed
Number compare analysis, draw the angular difference of electronic current mutual inductor to be measured, than poor information；
Strong current generator, will by experiment for being connected with standard current transformer and electronic current mutual inductor to be measured
Ask and export corresponding electric current to it successively；
Combining unit, is connected for the FT3 delivery outlets with electronic current mutual inductor to be measured, output IEC61850-9-2 marks
Quasi- SV signals and pulse per second (PPS) synchronizing signal simultaneously access to digital mutual inductor tester；
Digital relay protection tester, for receiving the output of combining unit IEC61850-9-2 normal datas, monitoring communication
Combining unit changes phenomenon with the presence or absence of packet loss, communication disruption, quality during united test；
Test main frame, for receiving digital mutual inductor tester data, carries out Data Management Analysis, draws experiment knot
Really；And induced over voltage withstand test device when industrial frequency withstand voltage experimental rig, impulse withstand voltage experimental rig and in short-term/long.
Wherein, described industrial frequency withstand voltage experimental rig includes industrial frequency withstand voltage machine and peak value meter, for respectively to independent experiment
When electronic current mutual inductor to be measured and communication united test when transformer carry out industrial frequency withstand voltage experiment.Described impact is resistance to
Compression testing device includes impulse voltage generator and impulse voltage divider, and transformer during for communication united test carries out thunder and lightning
Impact test.It is described in short-term/it is long when induced over voltage withstand test device include variable-frequency power sources, PD meter, peak value meter and industrial frequency withstand voltage
Partial volume device, for the inducting-voltage proof examination when carrying out induced over voltage withstand test in short-term to transformer during the united test that communicates and being long
Test.
The method that electronic current mutual inductor experiment is carried out using above-mentioned experimental rig, comprises the following steps：
S0 independent experiments：Independent experiment, including the examination of low-voltage device industrial frequency withstand voltage are carried out to electronic current mutual inductor to be measured
Test with basic accuracy test, judged whether by experimental phenomena and result of the test by independent experiment；
S1 communication united tests：Electronic current mutual inductor to be measured is installed on power transformer bushing lifting seat, entered
Row communication united test, including industrial frequency withstand voltage experiment, induced over voltage withstand test in short-term, it is long when induced over voltage withstand test and lightning impulse try
Test, combining unit output state is monitored by digital relay protection tester, so as to judge whether by the united test that communicates；
S2 independent experiments：Electronic current mutual inductor to be measured is pulled down from power transformer, again to electronic type to be measured
Current transformer carries out basic accuracy test, and whether this is passed through according to the diversity judgement of this result of the test and S0 test datas
Independent experiment.
The step of described low-voltage device industrial frequency withstand voltage is tested is as follows：
（1）The positive and negative end of electronic current mutual inductor power input to be measured is utilized into the short circuit of wire I, power ground end is utilized
Wire II is picked out, and power switch button is in " logical " state；
（2）Industrial frequency withstand voltage machine one end is connected with wire I, another to be terminated on wire II；
（3）Wiring is finished, and checks errorless, is passed to the voltage for the AC 2.0kV that the duration is 1min, is carried out industrial frequency withstand voltage
Experiment, has seen whether flashover and/or punch-through.
Basic accuracy test in S0 and S2 steps is comprised the following steps that：
（1）The primary connection port of standard current transformer is sealed in strong current generator electric current output lead loop,
Secondary output is connected to digital mutual inductor tester analog signal port；
（2）Electronic current mutual inductor sensing head to be measured is enclosed within strong current generator electric current output lead, electricity to be measured
The FT3 delivery outlets of type current transformer are connected to the corresponding FT3 signal receiving ends of combining unit；
（3）Combining unit IEC61850-9-2 standard SV output signals and pulse per second (PPS) synchronizing signal access digital mutual inductor
Tester；
（4）Wiring is finished, and is adjusted strong current generator current output value by strong current generator console, is adjusted respectively
5%, 20%, 100%, 120% to rated current, each current value of correspondence gathers 100 groups of angles using digital mutual inductor tester
Difference and compare difference data.
The experiment criterion of S0 independent experiments is：Experiment is finished, and is not dodged in low-voltage device industrial frequency withstand voltage process of the test
Equipment can normal work, ensuing basic accuracy test result satisfaction after network and punch-through, off-test
0.2 grade provides in GB20840.8-2007, then this wheel independent experiment passes through, and otherwise tests and does not pass through.
The step of S1 communication united tests, is as follows：
（1）Electronic current mutual inductor to be measured is installed on power transformer bushing lifting seat；
（2）The FT3 delivery outlets of electronic current mutual inductor to be measured are accessed into the corresponding FT3 signals of combining unit to receive
End, combining unit IEC61850-9-2 standard SV output signals and pulse per second (PPS) synchronizing signal are corresponded to respectively accesses to digital relay guarantor
Protect on tester optical interface；（3）Wiring is finished, and power transformer is provided according to GB1094.3-2003 standards, work is carried out successively
Frequency pressure test, in short-term induced over voltage withstand test, it is long when induced over voltage withstand test and lightning impulse test；
（4）Combining unit signal output state is monitored using digital relay protection tester in process of the test, including is lost
Bag phenomenon, communication disruption phenomenon, quality change phenomenon, if not occurring any of the above-described phenomenon, and communication united test passes through, otherwise
It is considered as and does not pass through.
The experiment criterion of S2 independent experiments is：Basic accuracy test result still meets in GB20840.8-2007 0.2 grade
Regulation, and with S0 accuracy tests data difference be no more than its basic accuracy error limit value half, then this wheel independent experiment
Pass through.
The present invention is on the basis of electronic current mutual inductor independent experiment as defined in GB20840.8-2007 standards, supplement
The communication united test of electronic current mutual inductor and power transformer, truly simulates electronic current mutual inductor in power transformation
Stand the extremely complicated environment run into live running, many measurement performances of mutual-inductor tester can comprehensively be examined
Examine, be that the reliable calibrating of electronic mutual inductor provides safeguard, the quality of electronic mutual inductor product is controlled from source.And
It is easy to operate using digital relay protection tester as signal monitoring equipment during communication united test.
Brief description of the drawings
Fig. 1 is bulk test flow chart of the present invention；
Fig. 2 is low-voltage device industrial frequency withstand voltage experimental rig wiring diagram of the present invention；
Fig. 3 is basic accuracy test device wiring diagram of the invention；
Fig. 4 is present invention communication united test device wiring diagram；
In figure, 1, electronic current mutual inductor to be measured, 2, bushing lifting seat.
Embodiment
Illustrate the specific implementation process of the present invention below in conjunction with the accompanying drawings：
As shown in figure 1, the electronic current mutual inductor bulk test process of the present invention is divided into following three step：
S0, for electronic current mutual inductor to be measured carry out independent experiment, specifically comprising S01 low-voltage devices industrial frequency withstand voltage examination
Test, the basic pilot projects of accuracy test two of S02；
S1, electronic current mutual inductor 1 to be measured is installed on power transformer bushing lifting seat 2, carries out the logical of the two
Believe united test, specifically include the experiment of S11 industrial frequency withstand voltages, S12 induceds over voltage withstand test in short-term, S13 it is long when induced over voltage withstand test,
S14 lightning impulse tests；
S2, electronic current mutual inductor to be measured removed from power transformer, carry out electronic current mutual inductance to be measured
The independent experiment of device, including the basic accuracy tests of S21.
As shown in Figure 2 and Figure 3, the experimental rig used by S0 independent experiments includes：
Standard current transformer：The standard current transformer need to be through assay approval, and before the deadline, measurement range is（5~
5000A）/ 5A, accuracy of measurement is 0.02 grade, for exporting high-precision current signal to digital mutual inductor tester, is made
For standard value；
Electronic current mutual inductor to be measured：Be installed on the electronic current mutual inductor to be measured in power transformer, successively with
The connection of each instrument, receives detection, wherein with FT3 forms by data output to combining unit；
Digital mutual inductor tester：Acceptable collection of simulant signal, IEC61850-9-2 format digital signal acquisitions, it is accurate
Exactness grade is 0.05 grade, can verify 0.2 (S) and the electronic current mutual inductor of ratings above, for by normalized current mutual inductance
Device, current transformer to be measured output numeral compare analysis, draw current transformer angular difference to be measured, than information such as differences；
Strong current generator：Realize that the output of 50 ~ 5000A alternating currents continuously adjustabe is for experiment there is provided current source；
Combining unit：The communication protocol used is IEC61850-9-2, and output port is optical port, and the method for synchronization is optical signal
Pulse per second (PPS) is synchronous, for receiving electronic current mutual inductor FT3 delivery outlet output signals to be measured；
Test main frame：For receiving digital mutual inductor tester data, Data Management Analysis is carried out, experiment knot is drawn
Really；
Industrial frequency withstand voltage machine, peak value meter：For carrying out industrial frequency withstand voltage experiment to electronic current mutual inductor to be measured.
S0 independent experiments can be divided into the experiment of S01 low-voltage devices industrial frequency withstand voltage, the basic experiments of accuracy test two of S02：
S01 low-voltage device industrial frequency withstand voltage test operation steps：
（1）The positive and negative end of electronic current mutual inductor power input port to be measured is utilized into the short circuit of wire I, power ground end
Picked out using wire II, power switch button is in " logical " state；
（2）The end of industrial frequency withstand voltage machine one is connected on wire I, it is another to be terminated on wire II；
（3）Wiring is finished, and checks errorless, is passed to the AC 2.0kV voltages that the duration is 1min, is carried out industrial frequency withstand voltage examination
Test；
The basic accuracy test operating procedures of S02：
（1）The primary connection port of standard current transformer is sealed in strong current generator electric current output lead loop,
Secondary output is connected on digital mutual inductor tester analog signal port；
（2）Electronic current mutual inductor sensing head to be measured is enclosed within strong current generator electric current output lead, electricity to be measured
The FT3 delivery outlets of type current transformer are connected to the corresponding FT3 signal receiving ends of combining unit；
（3）Combining unit IEC61850-9-2 SV output signals and pulse per second (PPS) synchronizing signal are connected to digital mutual inductor school
Test on instrument；
（4）Wiring is finished, and is adjusted strong current generator current output value by strong current generator console, is adjusted respectively
5%, 20%, 100%, 120% to rated current, each current value of correspondence gathers 100 groups of numbers using digital mutual inductor tester
According to that is, 100 groups than difference and angular difference.
S0 independent experiments test criterion：Experiment is finished, and does not occur flashover and punch-through in S01 processs of the test（Flashover
It is the experimental phenomena of observable in process of the test, it is to send sound by the pleasant to the ear equipment of process of the test to be judged to puncture）, experiment
After end equipment can normal work, S02 result of the tests meet in GB20840.8-2007 0.2 grade of regulation, then S0 independent experiments lead to
Cross, otherwise test and do not pass through.
The experimental rig of united test as shown in figure 4, S1 electronic current mutual inductors communicate with power transformer, including：
Electronic current mutual inductor to be measured, industrial frequency withstand voltage machine, peak value meter, combining unit, impulse voltage generator, impulse voltage divider and
Digital relay protection tester, variable-frequency power sources, PD meter, wherein industrial frequency withstand voltage partial volume device, industrial frequency withstand voltage machine, peak value meter, merging
Unit is shared with device in S0.
Digital relay protection tester, for receiving the output of combining unit IEC61850-9-2 normal datas, monitoring communication
Combining unit is with the presence or absence of phenomenons such as packet loss, communication disruption, quality changes during united test；
Industrial frequency withstand voltage machine and peak value meter, for carrying out industrial frequency withstand voltage experiment to transformer during communication united test；
Variable-frequency power sources, PD meter, peak value meter and industrial frequency withstand voltage partial volume device, for communication united test during to transformation
Device carry out in short-term and it is long when induced over voltage withstand test；
Impulse voltage generator and impulse voltage divider, for applying thunder and lightning punching to transformer during communication united test
Voltage is hit, lightning impulse test is carried out.The connection of above experimental rig is techniques well known, be will not be repeated here.
S1 communication united tests comprising the experiment of S11 industrial frequency withstand voltages, S12 induceds over voltage withstand test in short-term, S13 it is long when inducting-voltage proof
The pilot projects such as experiment, S14 lightning impulse tests.
Test operation step is as follows：
（1）Electronic current mutual inductor 1 to be measured is installed on power transformer bushing lifting seat 2；
（2）The FT3 delivery outlets of electronic current mutual inductor to be measured are connected to the corresponding FT3 signal receiving ends of combining unit,
Combining unit IEC61850-9-2 standard SV output signals and pulse per second (PPS) synchronizing signal are corresponded to respectively is connected to digital relay protection survey
Try on instrument optical interface；
（3）Wiring is finished, and power transformer is provided according to GB1094.3-2003 standards, and S11 ~ S14 experiments are carried out successively
Etc. pilot project, the specific operation process of these experiments is specified in GB1094.3-2003 standards, to will not be repeated here；
（4）Combining unit signal output state is monitored using digital relay protection tester in process of the test, judgement is
It is no to there is packet loss phenomenon, communication disruption phenomenon, quality change phenomenon.
S1 communication united test experiment criterions：During carrying out communication united test, need to continue it is uninterrupted using numeral after
Electric protection tester monitors combining unit data output situation, if not occurring the phenomenons such as packet loss, communication disruption, quality change,
Communication united test passes through, and is otherwise considered as and does not pass through.
S2 electronic current mutual inductor independent experiments to be measured
After communication united test S1 is finished, current transformer to be measured is removed from power transformer, again according to
The basic accuracy test methods of S01 carry out independent experiment, if result of the test remains to meet 0.2 grade of rule in GB20840.8-2007
It is fixed, and the half with basic accuracy test data difference in S0 no more than its basic accuracy error limit value, then test smooth
Pass through, otherwise do not pass through then.
It is attached：0.2 grade of regulation of GB20840.8-2007 standards
Claims (10)
1. a kind of electronic current mutual inductor experimental rig, it is characterised in that：Including
Standard current transformer, for exporting high-precision current signal to digital mutual inductor tester, is used as standard value；
Electronic current mutual inductor to be measured, is connected with instrument successively by test requirements document, carries out every experiment；
Digital mutual inductor tester, for by the output signal ratio of standard current transformer and electronic current mutual inductor to be measured
To analysis, the angular difference of electronic current mutual inductor to be measured is drawn, than poor information；
Strong current generator, for being connected with standard current transformer and electronic current mutual inductor to be measured, by test requirements document according to
It is secondary to export corresponding electric current to it；
Combining unit, is connected for the FT3 delivery outlets with electronic current mutual inductor to be measured, output IEC61850-9-2 standards SV
Signal and pulse per second (PPS) synchronizing signal simultaneously access to digital mutual inductor tester；
Digital relay protection tester, for receiving the output of combining unit IEC61850-9-2 normal datas, monitoring communication joint debugging
Combining unit changes phenomenon with the presence or absence of packet loss, communication disruption, quality in process of the test；
Test main frame, for receiving digital mutual inductor tester data, carries out Data Management Analysis, draws result of the test；With
And induced over voltage withstand test device when industrial frequency withstand voltage experimental rig, impulse withstand voltage experimental rig and in short-term/long.
2. electronic current mutual inductor experimental rig according to claim 1, it is characterised in that：Described industrial frequency withstand voltage examination
Experiment device include industrial frequency withstand voltage machine and peak value meter, for respectively to independent experiment when electronic current mutual inductor to be measured and communication
Transformer during united test carries out industrial frequency withstand voltage experiment.
3. electronic current mutual inductor experimental rig according to claim 1, it is characterised in that：Described impulse withstand voltage examination
Experiment device includes impulse voltage generator and impulse voltage divider, and transformer during for communication united test carries out lightning impulse
Experiment.
4. electronic current mutual inductor experimental rig according to claim 1, it is characterised in that：It is described in short-term/it is long when
Induced over voltage withstand test device includes variable-frequency power sources, PD meter, peak value meter and industrial frequency withstand voltage partial volume device, in communication united test
During to transformer carry out induced over voltage withstand test in short-term and it is long when induced over voltage withstand test.
5. the method that application claim 1 described device carries out electronic current mutual inductor experiment, it is characterised in that including following
Step：
S0 independent experiments：To electronic current mutual inductor to be measured carry out independent experiment, including low-voltage device industrial frequency withstand voltage experiment and
Basic accuracy test, is judged whether by independent experiment by experimental phenomena and result of the test；
S1 communication united tests：Electronic current mutual inductor to be measured is installed on power transformer bushing lifting seat, led to
Believe united test, including industrial frequency withstand voltage experiment, induced over voltage withstand test in short-term, it is long when induced over voltage withstand test and lightning impulse test,
Combining unit output state is monitored by digital relay protection tester, so as to judge whether by the united test that communicates；
S2 independent experiments：Electronic current mutual inductor to be measured is pulled down from power transformer, again to electronic current to be measured
Transformer carries out basic accuracy test, and whether the independence is passed through according to the diversity judgement of this result of the test and S0 test datas
Experiment.
6. the test method of electronic current mutual inductor according to claim 5, it is characterised in that：Described low-voltage device
The step of industrial frequency withstand voltage is tested is as follows：
The positive and negative end of electronic current mutual inductor power input to be measured is utilized into the short circuit of wire I, power ground end is connect using wire II
Go out, power switch button is in " logical " state；
Industrial frequency withstand voltage machine one end is connected with wire I, another to be terminated on wire II；
Wiring is finished, and checks errorless, is passed to the voltage for the AC 2.0kV that the duration is 1min, is carried out industrial frequency withstand voltage experiment, sees
Whether examine has flashover and/or punch-through.
7. the test method of electronic current mutual inductor according to claim 5, it is characterised in that：In S0 and S2 steps
Basic accuracy test is comprised the following steps that：
The primary connection port of standard current transformer is sealed in strong current generator electric current output lead loop, secondary output
It is connected to digital mutual inductor tester analog signal port；
Electronic current mutual inductor sensing head to be measured is enclosed within strong current generator electric current output lead, electronic current to be measured
The FT3 delivery outlets of transformer are connected to the corresponding FT3 signal receiving ends of combining unit；
Combining unit IEC61850-9-2 standard SV output signals and pulse per second (PPS) synchronizing signal access digital mutual inductor tester；
Wiring is finished, and is adjusted strong current generator current output value by strong current generator console, is adjusted respectively to specified
5%, 20%, 100%, the 120% of electric current, each current value of correspondence gathers 100 groups of angular differences using digital mutual inductor tester
With than difference data.
8. the test method of electronic current mutual inductor according to claim 7, it is characterised in that：The examination of S0 independent experiments
Testing criterion is：Experiment is finished, and does not occur flashover and punch-through in low-voltage device industrial frequency withstand voltage process of the test, after off-test
Equipment can normal work, ensuing basic accuracy test result meets in GB20840.8-2007 0.2 grade of regulation, then this takes turns
Independent experiment passes through, and otherwise tests and does not pass through.
9. the test method of electronic current mutual inductor according to claim 5, it is characterised in that：S1 communication united tests
The step of it is as follows：
(1) electronic current mutual inductor to be measured is installed on power transformer bushing lifting seat；
(2) the FT3 delivery outlets of electronic current mutual inductor to be measured are accessed into the corresponding FT3 signal receiving ends of combining unit, closed
And unit IEC61850-9-2 standard SV output signals and pulse per second (PPS) synchronizing signal correspond to access to digital relay protection survey respectively
Try on instrument optical interface；
(3) wiring is finished, and power transformer is provided according to GB1094.3-2003 standards, industrial frequency withstand voltage experiment is carried out successively, short
When induced over voltage withstand test, it is long when induced over voltage withstand test and lightning impulse test；
(4) monitor that combining unit signal output state, including packet loss show using digital relay protection tester in process of the test
As, communication disruption phenomenon, quality change phenomenon, if not occurring any of the above-described phenomenon, communication united test pass through, be otherwise considered as
Do not pass through.
10. the test method of electronic current mutual inductor according to claim 7, it is characterised in that：S2 independent experiments
Testing criterion is：Basic accuracy test result still meets 0.2 grade of regulation in GB20840.8-2007, and with S0 accuracy tests
Data difference is no more than the half of its basic accuracy error limit value, then this wheel independent experiment passes through.
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| CN106526520B (en) * | 2016-11-10 | 2019-12-06 | 广东电网有限责任公司电力科学研究院 | optical current transformer light source fluctuation interference test system |
| CN107064849A (en) * | 2017-03-15 | 2017-08-18 | 平高集团有限公司 | Electronic current mutual inductor check system and calibration equipment |
| CN107589331B (en) * | 2017-10-16 | 2024-04-05 | 国网河南省电力公司新乡供电公司 | Relay protection testing device |
| CN109521390A (en) * | 2018-12-29 | 2019-03-26 | 云南电网有限责任公司电力科学研究院 | A kind of SV sampling circuit test macro and method for intelligent substation |
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| CN113325354B (en) * | 2021-04-23 | 2023-12-26 | 中国电力科学研究院有限公司 | System and method for testing errors of electronic transformer for distribution network |
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| CN104330677A (en) | 2015-02-04 |
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Inventor after: Han Kejun Inventor after: Li Jun Inventor after: Yan Guanfeng Inventor after: Hao Na Inventor after: Zhang Meng Inventor after: Ding Hao Inventor after: Yin Xiaomin Inventor after: Chen Yuanlong Inventor after: Yu Guangyuan Inventor before: Han Kejun Inventor before: Li Jun Inventor before: Yan Guanfeng Inventor before: Hao Na Inventor before: Zhang Meng Inventor before: Ding Hao |
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