CN208443997U - A kind of mutual inductor dynamic error test macro - Google Patents
A kind of mutual inductor dynamic error test macro Download PDFInfo
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Abstract
The utility model discloses a kind of mutual inductor dynamic error test macros, the system comprises dynamic waveform signal source, signal processing unit, standard mutual inductor unit and dynamic error verification unit, the dynamic waveform signal source generates dynamic waveform signal for simulating various dynamic loads in several ways；The signal processing unit is used to generate the processing signal for being suitable for the input of mutual inductor primary side according to dynamic waveform signal；The mutual inductor that the standard mutual inductor unit is used to provide standard exports object as a comparison；The dynamic error verification unit is used to carry out error analysis, and output error data with to-be-tested transformer output according to the standard mutual inductor output under identical input；The system realizes and carries out dynamic error test to electric power mutual-inductor under simulation electric system access dynamic load, and the influence for assessment dynamic load to electric power mutual-inductor metering performance provides technological means.
Description
Technical field
The utility model relates to technical field of electric power, more particularly, to a kind of mutual inductor dynamic error test macro.
Background technique
With the extensive application of power electronic equipment and other novel electric power apparatus in the power system, part throttle characteristics becomes
It becomes increasingly complex.It is harmonic source load that existing research, which discusses at most, is mainly derived from nonlinear power electronic equipment, contains
Alternating current arc and ferromagnetic non-linear equipment, specifically there is steel mill, chemical plant, electric railway etc..When sinusoidal fundamental wave voltage is applied
When being added on non-linear equipment, former simple sinusoidal alternating current waveform can be distorted, the voltage waveform of electric current and application that equipment absorbs
Difference, harmonic current injection will result in voltage, current sinusoidal wave distortion, these equipment are just at power train into power grid
The harmonic source of system loads.And in practical power systems, system total load is always added by various loads of different nature, characteristic
It can be more complicated.
By the way that a large amount of measured datas are carried out with basic frequency analysis, the respective harmonic content of statistics voltage, electric current, and according to
The non-linear specific load of power grid is tentatively divided into two kinds: Harmonic Type and dynamic type by the wave character of current sampling signal.Harmonic Type
The essential characteristic of load is that voltage contains a small amount of harmonic wave, and electric current contains a large amount of harmonic waves, and electric current is steady non-sine periodic signal；It is dynamic
The essential characteristic of state type load is that voltage contains a small amount of harmonic wave, and electric current contains a large amount of harmonic waves, and electric current is non-stationary, non-sine, non-
Period (part) signal, it is special as dynamic envelope characteristic is presented in current signal.Based on the above-mentioned statistics to power grid actual loading
Analysis, basic Harmonic Type load has been unsatisfactory for the feature description to special dynamic type load, and part is due to amplitude or frequency
Rate changes caused signal localised waving, and the Dynamic Signal accounting of unstable condition is presented increasingly in signal certain time length
It is more；The error character that existing mutual inductor shows under Harmonic Type load and dynamic type load has differences, but existing
Error testing system, it is difficult to which satisfaction carries out accurate dynamic error measurement under dynamic load.
Utility model content
In order to solve existing error testing system existing for background technique, it is difficult to meet and be carried out accurately under dynamic load
Dynamic error measurement the problem of, the utility model provides a kind of mutual inductor dynamic error test macro, and the system can press
Actual demand simulates various dynamic loads in several ways and generates dynamic waveform signals, by with standard mutual inductor secondary side
The comparison of output obtains the error result under dynamic load, and a kind of mutual inductor dynamic error test macro includes:
Dynamic waveform signal source, the dynamic waveform signal source include that input module, signal source control module and DA turn
Change the mold block；The input module is used to receive the dynamic waveform parameter of preset format, and the dynamic waveform parameter is sent to
Signal source control module；The signal source control module generates dynamic waveform signal according to the dynamic waveform parameter, and to DA
Conversion module sends the dynamic waveform signal；The D/A conversion module answers analog waveform to believe according to dynamic waveform signal output phase
Number；The dynamic waveform parameter includes fundamental frequency, fundamental voltage amplitude, fundamental phase, overtone order and the corresponding width of each harmonic
It is worth vector and harmonic content；
The input terminal of the input module connects peripheral hardware input equipment, and the output end and signal source of the input module control
The input terminal of module is connected；The output end of the signal source control module is connected with the input terminal of D/A conversion module；The DA turns
The output end of mold changing block is connected with signal processing unit；
Signal processing unit, the signal processing unit is for pressing the analog waveform signal that dynamic waveform signal source exports
It is handled according to preset rules, obtains the processing signal for being suitable for the input of mutual inductor primary side；The output of the signal processing unit
End is connected with the input terminal of the input terminal of standard mutual inductor unit and to-be-tested transformer；
Standard mutual inductor unit, the standard mutual inductor unit are used for according to the processing in the input of standard mutual inductor primary side
Signal, in standard mutual inductor secondary side outputting standard signal；The secondary side output end of the standard mutual inductor and dynamic error school
Verification certificate member is connected；
Dynamic error verification unit, the dynamic error verification unit include signal conversion module, AD acquisition module, school
Test control module and qualification module；
The signal conversion module includes standard input port and input port to be measured, the standard input port and institute
The output end for stating standard mutual inductor is connected, and the input port to be measured is connected with to-be-tested transformer；The signal conversion module is used
In the standard small signal that the standard signal of input is converted to preset format；The signal conversion module is to be measured for that will input
Signal is converted to the small signal to be measured of preset format；
The verification control module is used to send the instruction of AD acquisition control to AD acquisition module according to preset rules；The school
Control module is tested for sending verification control instruction to performance correction verification module according to preset rules；
The AD acquisition module is used to send the standard small signal and small signal to be measured according to verification control module
AD acquisition control instruction be converted to standardized digital signal and digital signal to be measured；
The verification control instruction that the qualification module is used to be sent according to verification control module is to the standard digital
Signal and digital signal to be measured carry out error analysis, and output error data.
Further, the signal processing unit includes power amplifier and booster；The power amplifier is used for
The analog waveform signal that dynamic waveform signal source exports is amplified according to preset gain；The booster is used for power
Amplified analog waveform signal boosts according to preset rules, obtains voltage and handles signal；
The input terminal of the power amplifier is connected with the output end of the D/A conversion module of dynamic waveform signal source；The function
The output end of rate amplifier is connected with the input terminal of booster；The output end of the booster is the signal processing unit
Output end；
The standard mutual inductor unit includes standard potential transformer, and the standard potential transformer is used at according to voltage
Manage signal outputting standard voltage signal；
The standard input port of the signal conversion module includes normal voltage input port；The input port packet to be measured
Include voltage input port to be measured；The signal conversion module is used to be converted to the standard voltage signal of input the mark of preset format
Quasi- small voltage signal；The signal conversion module is used to be converted to the voltage signal to be measured of input the small electricity to be measured of preset format
Press signal；
Further, the signal processing unit includes power amplifier and current lifting device；The power amplifier is used for
The analog waveform signal that dynamic waveform signal source exports is amplified according to preset gain；The current lifting device is used for power
Amplified analog waveform signal is flowed up according to preset rules, obtains current processing signal；
The input terminal of the power amplifier is connected with the output end of the D/A conversion module of dynamic waveform signal source；The function
The output end of rate amplifier is connected with the input terminal of current lifting device；The output end of the current lifting device is the signal processing unit
Output end；
The standard mutual inductor unit includes standard current transformer, and the standard current transformer is used at according to electric current
Manage signal outputting standard current signal；
The standard input port of the signal conversion module includes normalized current input port；The input port packet to be measured
Include current input terminal mouth to be measured；The signal conversion module is used to be converted to the standard current signal of input the mark of preset format
Quasi- low current signal；The signal conversion module is used to be converted to the current signal to be measured of input the small electricity to be measured of preset format
Flow signal；
Further, the input module includes parameter input submodule and function input submodule；
The parameter input submodule described will be moved for receiving the dynamic waveform parameter that user is keyed in by preset format
State waveform parameter is sent to signal source control module；
The function input submodule is used to receive the multiple groups function formula of the in chronological sequence sequence combination of user's input,
And the function formula is sent to signal source control module, the signal source control module is obtained according to the resolving to function formula
Obtain dynamic waveform parameter；
Further, the input module includes Freehandhand-drawing Waveform Input submodule；
The Freehandhand-drawing Waveform Input submodule includes touch screen sensor and capture card；The touch screen sensor receives user
The waveform drawn on it, and the waveform is converted into waveform electric signal and is sent to capture card；The capture card is according to
Waveform Electric signal processing, which calculates, obtains dynamic waveform parameter, and the dynamic waveform parameter is sent to signal source control module；
Further, the verification control module is generated according to the preset sampling parameter including cycle and sample rate
The instruction of AD acquisition control；The verification control module according to it is preset include for the ranges of different transformer types, no-load voltage ratio with
And the checking parameter of signal path generates verification control instruction；
The utility model has the following beneficial effects: the technical solution of the utility model, gives a kind of mutual inductor dynamic error
Test macro, the system can simulate the voltage or current signal when electric system access dynamic load according to demand, lead to
The error result obtained under dynamic load compared with the output of standard mutual inductor secondary side is crossed, dynamic is carried out to electric power mutual-inductor
Load error test；Influence for assessment dynamic load to electric power mutual-inductor metering performance provides technological means.
Detailed description of the invention
By reference to the following drawings, the illustrative embodiments of the utility model can be more fully understood by:
Fig. 1 is a kind of structure chart of mutual inductor dynamic error test macro of specific embodiment of the present invention.
Specific embodiment
The illustrative embodiments of the utility model are introduced referring now to the drawings, however, the utility model can use many
Different forms is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be in order at large and complete
Open the utility model entirely, and the scope of the utility model is sufficiently conveyed to person of ordinary skill in the field.For
The term in illustrative embodiments being illustrated in the accompanying drawings not is the restriction to the utility model.In the accompanying drawings, identical
Cells/elements use identical appended drawing reference.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is a kind of structure chart of mutual inductor dynamic error test macro of specific embodiment of the present invention；It is described
System can be simulated in several ways various dynamic loads by actual demand and generate dynamic waveform signals, by with standard mutual inductor
The comparison of device secondary side output obtains the error result under dynamic load, a kind of mutual inductor dynamic error test macro packet
It includes:
Dynamic waveform signal source 110, the dynamic waveform signal source 110 include input module 111, signal source control module
112 and D/A conversion module 113；The input module 111 is used to receive the dynamic waveform parameter of preset format, and will be described dynamic
State waveform parameter is sent to signal source control module 112；The signal source control module 112 is raw according to the dynamic waveform parameter
The dynamic waveform signal is sent at dynamic waveform signal, and to D/A conversion module 113；The D/A conversion module is according to dynamic
Waveform signal output phase answers analog waveform signal；The dynamic waveform parameter include fundamental frequency, fundamental voltage amplitude, fundamental phase,
Overtone order and the corresponding amplitude vector of each harmonic and harmonic content；
The input terminal of the input module 111 connects peripheral hardware input equipment, the output end and signal of the input module 111
The input terminal of source control module 112 is connected；The output end of the signal source control module 112 and the input of D/A conversion module 113
End is connected；The output end of the D/A conversion module 113 is connected with signal processing unit；
Further, the input module 111 includes parameter input submodule, function input submodule and Freehandhand-drawing waveform
Input submodule；
The parameter input submodule described will be moved for receiving the dynamic waveform parameter that user is keyed in by preset format
State waveform parameter is sent to signal source control module 112；
This method for obtaining dynamic waveform parameter is the most direct, and the dynamic waveform of specified type is manually typed in by user
Parameter can be obtained；
The function input submodule is used to receive the multiple groups function formula of the in chronological sequence sequence combination of user's input,
And the function formula is sent to signal source control module 112, the signal source control module 112 is according to function formula
It resolves and obtains dynamic waveform parameter；
The function input submodule can realize that the model for simulating early period to dynamic load characteristics is directly applied to input
End, no longer needs to manually calculate and inputs parameters；
The Freehandhand-drawing Waveform Input submodule includes touch screen sensor and capture card；The touch screen sensor receives user
The waveform drawn on it, and the waveform is converted into waveform electric signal and is sent to capture card；The capture card is according to
Waveform Electric signal processing, which calculates, obtains dynamic waveform parameter, and the dynamic waveform parameter is sent to signal source control module
112；
The touch screen sensor can be drawn with lettering pen also provided with corresponding touch screen to be a variety of；The touch screen
Transverse and longitudinal coordinate can be shown in advance on sensor and is equipped with auxiliary line on demand；
The Freehandhand-drawing Waveform Input submodule is solved when the characteristic of the dynamic load can not be obtained by way of modeling
It obtains or modeling error is larger, in the case where not can guarantee simulation effect, according to the load actual waveform measured in touch screen sensor
On reappeared, to obtain corresponding dynamic waveform；
The mode that the input module 111 is inputted including but not limited to above-mentioned three kinds, completely covers for input table
Show the dynamic waveform of dynamic load characteristics or the various situations of dynamic waveform parameter, ensure that the simulation to the dynamic load of demand
Accuracy；
By taking the present embodiment as an example, the signal source control module 112 by model IPC-510MB industrial personal computer and model
It is formed for the DSP of TMS320LF2407, control software is write using LabVIEW；The touch screen sensor is embedded using Ctfly
Touch screen displays；D/A converter is the D/A converter of model LTC2656-12；
Signal processing unit 120, the signal processing unit 120 are used for the simulation for exporting dynamic waveform signal source 110
Waveform signal is handled according to preset rules, obtains the processing signal for being suitable for the input of mutual inductor primary side；The signal processing
The output end of unit 120 is connected with the input terminal of the input terminal of standard mutual inductor unit and to-be-tested transformer；
Further, the signal processing unit 120 includes power amplifier, current lifting device and booster；According to be measured
The difference (voltage transformer or current transformer) of mutual inductor, the signal processing unit 120 match current lifting device or booster；Into
One step, can also include current lifting device and booster, further according to the different switch operating routes of to-be-tested transformer simultaneously；
The analog waveform signal that the power amplifier is used to export dynamic waveform signal source 110 is according to preset gain
It amplifies；The booster obtains electricity for the analog waveform signal after power amplification to boost according to preset rules
Pressure processing signal；The current lifting device is obtained for flowing up the analog waveform signal after power amplification according to preset rules
Current processing signal；
When using booster, the input terminal of the power amplifier and the DA conversion module of dynamic waveform signal source 110
113 output end is connected；The output end of the power amplifier is connected with the input terminal of booster；The output end of the booster
The output end of the as described signal processing unit 120；
When using current lifting device, the input terminal of the power amplifier and the DA conversion module of dynamic waveform signal source 110
113 output end is connected；The output end of the power amplifier is connected with the input terminal of current lifting device；The output end of the current lifting device
The output end of the as described signal processing unit 120；
By taking the present embodiment as an example, the power amplifier of the signal processing unit 120 uses AE Techron company
7796 power amplifiers；Booster uses 50KV testing transformer；Current lifting device uses the punching current lifting device of 1000A；
Standard mutual inductor unit 130, the standard mutual inductor unit 130 are used to input according in standard mutual inductor primary side
Processing signal, in standard mutual inductor secondary side outputting standard signal；
The standard mutual inductor unit 130 includes standard potential transformer and standard current transformer, the standard electric
Mutual inductor is pressed to be used to handle signal outputting standard voltage signal according to voltage；The standard current transformer is used at according to electric current
Manage signal outputting standard current signal；
By taking the present embodiment as an example, 35kV/100V, the 0.005 step voltage mutual inductor of standard potential transformer selection；Standard electric
What current transformer was selected is (5A~2000A)/5A, 0.01S grades of current transformer.
Dynamic error verification unit 140, the dynamic error verification unit 140 include signal conversion module 141, AD acquisition
Module 142, verification control module 143 and qualification module 144；
The signal conversion module 141 includes standard input port and input port to be measured, the standard input port
It is connected with the output end of the standard mutual inductor, the input port to be measured is connected with to-be-tested transformer；The signal modulus of conversion
Block 141 is used to be converted to the standard signal of input the standard small signal of preset format；The signal conversion module 141 is used for will
The measured signal of input is converted to the small signal to be measured of preset format；
Further, the standard input port of the signal conversion module 141 includes normal voltage input port；It is described to
Surveying input port includes voltage input port to be measured；The standard voltage signal that the signal conversion module 141 is used to input turns
It is changed to the standard small voltage signal of preset format；The voltage signal to be measured conversion that the signal conversion module 141 is used to input
For the small voltage signal to be measured of preset format；
Further, the standard input port of the signal conversion module 141 includes normalized current input port；It is described to
Surveying input port includes current input terminal mouth to be measured；The standard current signal that the signal conversion module 141 is used to input turns
It is changed to the standard small electric current signal of preset format；The current signal to be measured conversion that the signal conversion module 141 is used to input
For the low current signal to be measured of preset format；
The verification control module 143, which is used to send AD acquisition control to AD acquisition module 142 according to preset rules, to be referred to
It enables；The verification control module 143 is used to send verification control instruction to performance correction verification module 144 according to preset rules；
Further, the verification control module 143 is according to the preset sampling parameter including cycle and sample rate
Generate the instruction of AD acquisition control；It is described verification control module 143 according to it is preset include for different transformer types range,
The checking parameter of no-load voltage ratio and signal path generates verification control instruction；
The AD acquisition module 142 is used for the standard small signal and small signal to be measured according to verification control module
The 143 AD acquisition control instructions sent are converted to standardized digital signal and digital signal to be measured；
The verification control instruction that the qualification module 144 is used to be sent according to verification control module 143 is to the mark
Quasi- digital signal and digital signal to be measured carry out error analysis, and output error data.
By taking the present embodiment as an example, the signal conversion module 141 selects the seven disk inductive voltage dividers of voltage rating 200V
The current divider A40B of FGB-02 and rated current 5A, the 0~120V voltage signal or 0~6A electric current that mutual inductor secondary side is exported
The small voltage signal that signal is converted to 1V or so is transferred to AD acquisition module 142；AD acquisition module 142 uses AD9695-1300
A/D chip；Magnificent industrial personal computer IPC-510MB is ground in the verification selection of control module 143；Qualification module 144 uses
TMS320F2812 type DSP.
Claims (6)
1. a kind of mutual inductor dynamic error test macro, which is characterized in that the system comprises:
Dynamic waveform signal source, the dynamic waveform signal source include input module, signal source control module and DA modulus of conversion
Block；The input module is used to receive the dynamic waveform parameter of preset format, and the dynamic waveform parameter is sent to signal
Source control module；The signal source control module generates dynamic waveform signal according to the dynamic waveform parameter, and converts to DA
Module sends the dynamic waveform signal；The D/A conversion module answers analog waveform signal according to dynamic waveform signal output phase；
The dynamic waveform parameter include fundamental frequency, fundamental voltage amplitude, fundamental phase, overtone order and the corresponding amplitude of each harmonic to
Amount and harmonic content；
The input terminal of the input module connects peripheral hardware input equipment, the output end and signal source control module of the input module
Input terminal be connected；The output end of the signal source control module is connected with the input terminal of D/A conversion module；The DA modulus of conversion
The output end of block is connected with signal processing unit；
Signal processing unit, the analog waveform signal that the signal processing unit is used to export dynamic waveform signal source is according to pre-
If rule is handled, the processing signal for being suitable for the input of mutual inductor primary side is obtained；The output end of the signal processing unit with
The input terminal of standard mutual inductor unit and the input terminal of to-be-tested transformer are connected；
Standard mutual inductor unit, the standard mutual inductor unit are used for according to the processing letter in the input of standard mutual inductor primary side
Number, in standard mutual inductor secondary side outputting standard signal；The secondary side output end and dynamic error of the standard mutual inductor verify
Unit is connected；
Dynamic error verification unit, the dynamic error verification unit include signal conversion module, AD acquisition module, verification control
Module and qualification module；
The signal conversion module includes standard input port and input port to be measured, the standard input port and the mark
The output end of quasi- mutual inductor is connected, and the input port to be measured is connected with to-be-tested transformer；The signal conversion module is used for will
The standard signal of input is converted to the standard small signal of preset format；The signal conversion module is used for the measured signal that will be inputted
Be converted to the small signal to be measured of preset format；
The verification control module is used to send the instruction of AD acquisition control to AD acquisition module according to preset rules；The verification control
Molding block is used to send verification control instruction to performance correction verification module according to preset rules；
The AD acquisition module is used for the AD for sending the standard small signal and small signal to be measured according to verification control module
Acquisition control instruction is converted to standardized digital signal and digital signal to be measured；
The verification control instruction that the qualification module is used to be sent according to verification control module is to the standardized digital signal
Error analysis, and output error data are carried out with digital signal to be measured.
2. system according to claim 1, it is characterised in that: the signal processing unit includes power amplifier and liter
Depressor；The power amplifier is for putting the analog waveform signal that dynamic waveform signal source exports according to preset gain
Greatly；The booster obtains voltage processing for the analog waveform signal after power amplification to boost according to preset rules
Signal；
The input terminal of the power amplifier is connected with the output end of the D/A conversion module of dynamic waveform signal source；The power is put
The big output end of device is connected with the input terminal of booster；The output end of the booster is the output of the signal processing unit
End；
The standard mutual inductor unit includes standard potential transformer, and the standard potential transformer, which is used to be handled according to voltage, to be believed
Number outputting standard voltage signal；
The standard input port of the signal conversion module includes normal voltage input port；The input port to be measured include to
Survey voltage input port；The standard that the signal conversion module is used to the standard voltage signal of input being converted to preset format is small
Voltage signal；The small voltage to be measured that the signal conversion module is used to be converted to the voltage signal to be measured of input preset format is believed
Number.
3. system according to claim 1, it is characterised in that: the signal processing unit includes power amplifier and liter
Flow device；The power amplifier is for putting the analog waveform signal that dynamic waveform signal source exports according to preset gain
Greatly；The current lifting device obtains current processing for flowing up the analog waveform signal after power amplification according to preset rules
Signal；
The input terminal of the power amplifier is connected with the output end of the D/A conversion module of dynamic waveform signal source；The power is put
The big output end of device is connected with the input terminal of current lifting device；The output end of the current lifting device is the output of the signal processing unit
End；
The standard mutual inductor unit includes standard current transformer, and the standard current transformer according to current processing for believing
Number outputting standard current signal；
The standard input port of the signal conversion module includes normalized current input port；The input port to be measured include to
Survey current input terminal mouth；The standard that the signal conversion module is used to the standard current signal of input being converted to preset format is small
Current signal；The low current to be measured that the signal conversion module is used to be converted to the current signal to be measured of input preset format is believed
Number.
4. system according to claim 1, it is characterised in that: the input module includes parameter input submodule and letter
Number input submodule；
The parameter input submodule is for receiving the dynamic waveform parameter that user is keyed in by preset format, and by the dynamic wave
Shape parameter is sent to signal source control module；
The function input submodule is used to receive the multiple groups function formula of the in chronological sequence sequence combination of user's input, and will
The function formula is sent to signal source control module, and the signal source control module is moved according to the resolving to function formula
State waveform parameter.
5. system according to claim 1, it is characterised in that: the input module includes Freehandhand-drawing Waveform Input submodule；
The Freehandhand-drawing Waveform Input submodule includes touch screen sensor and capture card；The touch screen sensor receives user at it
The waveform of upper drafting, and the waveform is converted into waveform electric signal and is sent to capture card；The capture card is according to the waveform
Electric signal processing, which calculates, obtains dynamic waveform parameter, and the dynamic waveform parameter is sent to signal source control module.
6. system according to claim 1, it is characterised in that: the verification control module is according to preset including cycle
And the sampling parameter of sample rate generates the instruction of AD acquisition control；The verification control module is according to preset including for difference
The checking parameter of the range of transformer type, no-load voltage ratio and signal path generates verification control instruction.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108717172A (en) * | 2018-04-13 | 2018-10-30 | 中国电力科学研究院有限公司 | A kind of mutual inductor dynamic error test system and method |
| CN114137469A (en) * | 2021-11-25 | 2022-03-04 | 国网陕西省电力公司西咸新区供电公司 | Method and system for realizing intelligent calibration of multi-tap current transformer |
| CN116699454A (en) * | 2023-07-07 | 2023-09-05 | 深圳市大亮智造科技有限公司 | Power failure detection system and detection method for power detection equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108717172A (en) * | 2018-04-13 | 2018-10-30 | 中国电力科学研究院有限公司 | A kind of mutual inductor dynamic error test system and method |
| CN114137469A (en) * | 2021-11-25 | 2022-03-04 | 国网陕西省电力公司西咸新区供电公司 | Method and system for realizing intelligent calibration of multi-tap current transformer |
| CN116699454A (en) * | 2023-07-07 | 2023-09-05 | 深圳市大亮智造科技有限公司 | Power failure detection system and detection method for power detection equipment |
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