CN108957140A - A kind of impedance measurement circuit system and method for wide dynamic range - Google Patents
A kind of impedance measurement circuit system and method for wide dynamic range Download PDFInfo
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- CN108957140A CN108957140A CN201810719705.7A CN201810719705A CN108957140A CN 108957140 A CN108957140 A CN 108957140A CN 201810719705 A CN201810719705 A CN 201810719705A CN 108957140 A CN108957140 A CN 108957140A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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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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Abstract
The invention discloses a kind of impedance measurement circuit system and method for wide dynamic range, belong to current transformer detection field.A kind of impedance measurement circuit system of wide dynamic range, including signal injection unit 101, current signal detection unit 102, high-frequency signal detection unit 103, signal processing and control unit 104, injection coupling circuit and detection coupling circuit；Signal processing and control unit 104 generate high-frequency digital signal and are injected into secondary loop of mutual inductor by DA1, signal injection unit 101, injection coupling circuit；Control the gear of signal injection unit 101, current signal detection unit 102 and high-frequency signal detection unit 103；Signal processing and the processing of control unit 104 and control high-frequency digital signal.The impedance measurement scope of application of the accurate wide dynamic range of the present invention is wider, be also CT winding failure, Abnormal Insulation, CT no-load voltage ratio replacement etc. deeper Failure Mode Analysis provide reliable data basis.
Description
Technical field
The present invention relates to current transformer detection fields, and more specifically body is related to a kind of circuit resistance of wide dynamic range
Anti- measuring system and method.
Background technique
Metering current mulual inductor secondary circuit failure state analysis and the technical method of stealing state recognition are many kinds of, and one
As can analyze the malfunctions such as the second open circuit of current transformer, secondary bypass, primary bypass, secondary concatenation semiconductor, this
Most efficient method is to be analyzed using the high frequency equivalent impedance of secondary circuit as characteristic quantity in a little technical methods.One
As be then to measure return signal and carry out high frequency equivalent impedance computation by first injecting a high-frequency signal.
Metering current mulual inductor secondary circuit causes different specially to become meter because of the no-load voltage ratio difference of current transformer, process variations etc.
The resistance difference for measuring secondary loop of mutual inductor is very big, and impedance ranges are very wide, and high frequency equivalent impedance is about from 0.1 ohm to 100k
Ohm differs.It is existing using secondary circuit impedance as characteristic quantity come the device of analysis circuit malfunction and stealing state and
System all cannot achieve the measurement of so wide impedance ranges, cause Failure Mode Analysis discrimination not high.
Summary of the invention
Specially become metering current mulual inductor secondary circuit high frequency equivalent impedance contrast the purpose of the present invention is effective solution is different
Different big, wide dynamic range measurement, can not only increase substantially the discrimination of secondary circuit failure state analysis, but also accurate
Wide dynamic range impedance measurement be also CT winding failure, Abnormal Insulation and CT no-load voltage ratio replacement etc. deeper malfunction
Analysis provides data foundation, proposes a kind of impedance measurement circuit system and method for wide dynamic range.
A kind of impedance measurement circuit system of wide dynamic range, comprising: signal injection unit 101, current signal detection are single
Member 102, high-frequency signal detection unit 103, signal processing and control unit 104, injection coupling circuit and detection coupling circuit；
The adjustment injection sine voltage signal of signal injection unit 101Amplitude；
The current signal of the detection injection coupling circuit of current signal detection unit 102By AD2 to signal processing and control
Unit 104 processed；
The detection detection coupling circuit of high-frequency signal detection unit 103For sampling resistor R2The voltage signal at both ends passes through
AD1 is to signal processing and control unit 104；
Injecting coupling circuit and detection coupling circuit is coupling of the signal from measuring system to secondary loop of mutual inductor
Mode；
Signal processing and control unit 104 generate high-frequency digital signal by DA1, signal injection unit 101, injection coupling
Circuit is injected into secondary loop of mutual inductor；Control signal injection unit 101, current signal detection unit 102 and high frequency letter
The gear of number detection unit 103；
Signal processing and the processing of control unit 104 and control high-frequency digital signal, the processing and control include: (1) meter
When the high frequency equivalent impedance of amount secondary circuit is smaller, signal injection unit 101 switches gear injection It is injected for signal single
The sine voltage signal of member injection, current signal detection unit 102 switch gear detection For injecting voltageThe electricity of generation
Stream；If detectedGreater than the 1/10 of AD2 full scale, stream method computing impedance is examined using injection, Injection Current mutual inductor is secondary
The impedance in circuit, process terminate.
Wherein
The then impedance of metering secondary
Wherein n0For coil T1 the number of turns, R0To inject front-end circuit sampling resistor, Z1cFor the height of the constant frequency of coil T1
Frequency equivalent impedance；Injecting voltage when opening a way for metering secondaryThe electric current of generation；If the signal detected is less than AD
1/10 circulation step (1) of full scale, if signal injection unit and current signal detection unit to switch to maximum gear,
The signal detected is less than the 1/10 of AD full scale, enters step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, signal injection unit switches gear Injection SignalIt is high
Frequency detecting signal unit switches gear, detectable voltage signalsIf the voltage signal detectedGreater than AD1 full scale
1/10, using injection remelting of scrap computing impedance, process terminates；
Wherein
The impedance of metering secondary
Then
Wherein R2To detect front-end circuit sampling resistor,For the voltage for being injected into metering secondary,ForOutput
Electric current,For sampling resistor R2The voltage at both ends,
The circulation step (2) if the signal detected is less than the 1/10 of AD full scale, if signal injection unit and height
Frequency detecting signal unit calculates impedance to switch to maximum gear, according to formula 10, and process terminates.
Optionally, injection coupling circuit and detection coupling circuit,
Wherein
Cause
Then
Wherein
Cause
Then
n2For coil T2 the number of turns,For the voltage at the both ends T1,To be coupled to signal detection front end electric current.
Optionally, signal injection unit has multiple signal amplification gears；The current signal detection unit has multiple signals
Amplify gear；The high-frequency signal detection unit has multiple signal amplification gears.
Optionally, high-frequency digital signal frequency range is 1kHz-100kHz.
Optionally, coupled modes are magnetic coupling mode.
A kind of impedance measurement circuit method of wide dynamic range, including,
Step 1, signal processing and control unit 104 control signal injection unit 101 and switch gear Injection SignalAnd it produces
Raw high-frequency digital signal is injected into injection coupling circuit and secondary loop of mutual inductor by DA1 and signal injection unit 101；
Step 2, injection coupling circuit and detection coupling circuit arrive current transformer after coupling to high-frequency digital signal
Secondary circuit；
Step 3, the current signal of the detection injection coupling circuit of current signal detection unit 102 is by AD2 to signal processing
And control unit；
Step 4, the voltage signal of the detection detection coupling circuit of high-frequency signal detection unit 103 is by AD1 to signal processing
And control unit；
When the high frequency equivalent impedance of step 5, (1) metering secondary is smaller, signal injection unit 101 switches gear note
Enter For the sine voltage signal of signal injection unit injection, current signal detection unit 102 switches gear detection
For injecting voltageThe electric current of generation；If detectedGreater than the 1/10 of AD2 full scale, resistance is calculated using injection inspection stream method
Anti-, the impedance of Injection Current transformer secondary circuit, process terminates；
Wherein
The then impedance of metering secondary
Wherein n0For coil T1 the number of turns, R0To inject front-end circuit sampling resistor, Z1cFor the height of the constant frequency of coil T1
Frequency equivalent impedance；Injecting voltage when opening a way for metering secondaryThe electric current of generation, process terminate；If detected
Signal is less than 1/10 circulation step (1) of AD full scale, if signal injection unit and current signal detection unit are to switch
To maximum gear, the signal detected is less than the 1/10 of AD full scale, enters step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, signal injection unit switches gear Injection SignalIt is high
Frequency detecting signal unit switches gear, detectable voltage signalsIf the voltage signal detectedGreater than AD1 full scale
1/10, using injection remelting of scrap computing impedance, process terminates；
Wherein
The impedance of metering secondary
Then
Wherein R2To detect front-end circuit sampling resistor,For the voltage for being injected into metering secondary,ForOutput
Electric current,For sampling resistor R2The voltage at both ends,
The circulation step (2) if the signal detected is less than the 1/10 of AD full scale, if signal injection unit and height
Frequency detecting signal unit calculates impedance to switch to maximum gear, according to formula 10, and process terminates.
Optionally, injection coupling circuit and detection coupling circuit,
Wherein
Cause
Then
Wherein
Cause
Then
n2For coil T2 the number of turns,For the voltage at the both ends T1,To be coupled to signal detection front end electric current.
Optionally, signal injection unit has multiple signal amplification gears；The current signal detection unit has multiple signals
Amplify gear；The high-frequency signal detection unit has multiple signal amplification gears.
Optionally, high-frequency digital signal frequency range is 1kHz-100kHz.
Optionally, coupled modes are magnetic coupling mode.
Can accurately measure 0.1 ohm of high frequency equivalent impedance ranges Dao 100k ohm of the present invention, the high frequency equivalent resistance of measurement
Anti- dynamic range is 106.The impedance measurement scope of application of accurate wide dynamic range is wider, is also CT winding failure, insulation
The deeper Failure Mode Analysis such as abnormal, CT no-load voltage ratio replacement provide reliable data basis.
Detailed description of the invention
Fig. 1 is a kind of impedance measurement circuit system construction drawing of wide dynamic range of the present invention；
Fig. 2 is a kind of impedance measurement circuit method flow diagram of wide dynamic range of the present invention.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
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 impedance measurement circuit system construction drawing of wide dynamic range of the present invention.
The present invention provides a kind of impedance measurement circuit systems of wide dynamic range, as shown in Figure 1, comprising: signal injection
Unit 101, current signal detection unit 102, high-frequency signal detection unit 103, signal processing and control unit 104, injection coupling
Close circuit and detection coupling circuit；
The adjustment injection sine voltage signal of signal injection unit 101Amplitude；
The current signal of the detection injection coupling circuit of current signal detection unit 102By AD2 to signal processing and control
Unit 104 processed；
The detection detection coupling circuit of high-frequency signal detection unit 103For sampling resistor R2The voltage signal at both ends passes through
AD1 is to signal processing and control unit 104；
Signal injection unit 101 has multiple signal amplification gears；Current signal detection unit 102 has multiple signal amplification shelves
Position；High-frequency signal detection unit 103 has multiple signal amplification gears.
Injecting coupling circuit and detection coupling circuit is coupling of the signal from measuring system to secondary loop of mutual inductor
Mode；Coupled modes are magnetic coupling mode；Coupling circuit and detection coupling circuit are injected, coil T1 the number of turns is n0, coil
T2 the number of turns is n2；
Wherein
Cause
Then
Wherein
Cause
Then
Wherein R0To inject front-end circuit sampling resistor, R2To detect front-end circuit sampling resistor, Z1cFor the perseverance of coil T1
Determine the high frequency equivalent impedance of frequency；For signal injection unit injection sine voltage signal,For injecting voltageIt generates
Electric current,Injecting voltage when opening a way for metering secondaryThe electric current of generation,
For the voltage at the both ends T1,For the voltage for being injected into metering secondary,ForThe electric current of output,For
It is coupled to signal detection front end electric current,For sampling resistor R2The voltage at both ends.
Signal processing and control unit 104 generate high-frequency digital signal by DA1, signal injection unit 101, injection coupling
Circuit is injected into secondary loop of mutual inductor；Control signal injection unit 101, current signal detection unit 102 and high frequency letter
The gear of number detection unit 103；High-frequency digital signal frequency range is 1kHz-100kHz.
Signal processing and the processing of control unit 104 and control high-frequency digital signal, the processing and control include:
(1) when the high frequency equivalent impedance of metering secondary is smaller, signal injection unit 101 switches gear injectionElectricity
It flows detecting signal unit 102 and switches gear, detectionIf detectedGreater than the 1/10 of AD2 full scale, using injection inspection stream
Method calculates impedance,
The impedance of Injection Current transformer secondary circuit
Have
The then impedance of metering secondary
WhereinFor constant；, process terminates；The circulation step if the signal detected is less than the 1/10 of AD full scale
(1), if signal injection unit and current signal detection unit are to switch to maximum gear, the signal detected is less than AD and completely measures
The 1/10 of journey enters step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, signal injection unit switches gear Injection SignalIt is high
Frequency detecting signal unit switches gear, detectable voltage signalsIf the voltage signal detectedGreater than AD1 full scale
1/10, impedance is calculated using the injection remelting of scrap；
Wherein
The impedance of metering secondary
Then
Wherein R0, R2, n0, n2, constant；, process terminates；It is followed if the signal detected is less than the 1/10 of AD full scale
Ring step (2), if signal injection unit and high-frequency signal detection unit are calculated with switching to maximum gear according to formula 10
Impedance, process terminate.
Fig. 2 is a kind of impedance measurement circuit method flow diagram of wide dynamic range of the present invention.
A kind of impedance measurement circuit method of wide dynamic range, as shown in Fig. 2, include,
Step 1, signal processing and control unit 104 control signal injection unit 101 and switch gear Injection SignalAnd it produces
Raw high-frequency digital signal is injected into injection coupling circuit and secondary loop of mutual inductor by DA1 and signal injection unit 101,
High-frequency digital signal frequency range is 1kHz-100kHz.
Step 2, injection coupling circuit and detection coupling circuit arrive current transformer after coupling to high-frequency digital signal
Secondary circuit；Optionally, coupled modes are magnetic coupling mode；Inject coupling circuit and detection coupling circuit, coil T1 circle
Number is n0, coil T2 the number of turns is n2
Wherein
Cause
Then
Wherein
Cause
Then
Wherein R0To inject front-end circuit sampling resistor, R2To detect front-end circuit sampling resistor, Z1cFor the perseverance of coil T1
Determine the high frequency equivalent impedance of frequency；For signal injection unit injection sine voltage signal,For injecting voltageIt generates
Electric current,Injecting voltage when opening a way for metering secondaryThe electric current of generation,
For the voltage at the both ends T1,For the voltage for being injected into metering secondary,ForThe electric current of output,For
It is coupled to signal detection front end electric current,For sampling resistor R2The voltage at both ends.
Step 3, the current signal of the detection injection coupling circuit of current signal detection unit 102 is by AD2 to signal processing
And control unit；
Step 4, the voltage signal of the detection detection coupling circuit of high-frequency signal detection unit 103 is by AD1 to signal processing
And control unit；
Signal injection unit has multiple signal amplification gears；The current signal detection unit has multiple signal amplification shelves
Position；The high-frequency signal detection unit has multiple signal amplification gears.
When the high frequency equivalent impedance of step 5, (1) metering secondary is smaller, control current signal detection unit 102 is cut
Gear shift position, sensed current signalIf the current signal detectedGreater than the 1/10 of AD2 full scale, using injection inspection stream
Method calculates impedance, injects high-frequency voltage signal, the current signal that detection coil T1 is generated from coil T1；
The impedance of infusion circuit
Have
The then impedance of metering secondary
WhereinFor constant；
, process terminates；The circulation step (1) if the signal detected is less than the 1/10 of AD full scale, if signal is infused
Enter unit and current signal detection unit to switch to maximum gear, the signal detected is less than the 1/10 of AD full scale, enters
To step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, control high-frequency signal detection unit switches gear, detection
Voltage signalIf the voltage signal detectedGreater than the 1/10 of AD1 full scale, resistance is calculated using the injection remelting of scrap
It is anti-, high-frequency voltage signal, the high-frequency signal that detection coil T2 is coupled to are injected from coil T1；
Wherein
The impedance of metering secondary
Then
Wherein R0, R2, n0, n2, constant；, process terminates；It is followed if the signal detected is less than the 1/10 of AD full scale
Ring step (2), if signal injection unit and high-frequency signal detection unit are calculated with switching to maximum gear according to formula 10
Impedance, process terminate.
Can accurately measure 0.1 ohm of high frequency equivalent impedance ranges Dao 100k ohm of the present invention, the high frequency equivalent resistance of measurement
Anti- dynamic range is 106.The impedance measurement scope of application of accurate wide dynamic range is wider, is also CT winding failure, insulation
The deeper Failure Mode Analysis such as abnormal, CT no-load voltage ratio replacement provide reliable data basis.
Claims (10)
1. feature exists in the impedance measurement circuit system of kind of wide dynamic range: believing including signal injection unit 101, electric current
Number detection unit 102, high-frequency signal detection unit 103, signal processing and control unit 104, injection coupling circuit and detection coupling
Close circuit；
The adjustment injection sine voltage signal of signal injection unit 101Amplitude；
The current signal of the detection injection coupling circuit of current signal detection unit 102It is single by AD2 to signal processing and control
Member 104；
The detection detection coupling circuit of high-frequency signal detection unit 103For sampling resistor R2The voltage signal at both ends passes through AD1
To signal processing and control unit 104；
Injecting coupling circuit and detection coupling circuit is coupled modes of the signal from measuring system to secondary loop of mutual inductor；
Signal processing and control unit 104 generate high-frequency digital signal by DA1, signal injection unit 101, injection coupling circuit
It is injected into secondary loop of mutual inductor；Control signal injection unit 101, current signal detection unit 102 and high-frequency signal inspection
Survey the gear of unit 103；
Signal processing and the processing of control unit 104 and control high-frequency digital signal, the processing and control include:
(1) when the high frequency equivalent impedance of metering secondary is smaller, signal injection unit 101 switches gear injection For letter
The sine voltage signal of number injection unit injection, current signal detection unit 102 switch gear detection For injecting voltage
The electric current of generation；If detectedGreater than the 1/10 of AD2 full scale, stream method computing impedance is examined using injection, Injection Current is mutual
The impedance of sensor secondary circuit, process terminate；
Wherein
The then impedance of metering secondary
Wherein n0For coil T1 the number of turns, R0To inject front-end circuit sampling resistor, Z1cFor the high frequency equivalent of the constant frequency of coil T1
Impedance；Injecting voltage when opening a way for metering secondaryThe electric current of generation；If the signal detected is less than AD full scale
1/10 circulation step (1), if signal injection unit and current signal detection unit are detected with switching to maximum gear
Signal be less than AD full scale 1/10, enter step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, signal injection unit switches gear Injection SignalHigh frequency letter
Number detection unit switches gear, detectable voltage signalsIf the voltage signal detectedGreater than the 1/10 of AD1 full scale,
Using injection remelting of scrap computing impedance, process terminates；
Wherein
The impedance of metering secondary
Then
Wherein R2To detect front-end circuit sampling resistor,For the voltage for being injected into metering secondary,ForThe electricity of output
Stream,For sampling resistor R2The voltage at both ends,
The circulation step (2) if the signal detected is less than the 1/10 of AD full scale, if signal injection unit and high frequency letter
Number detection unit calculates impedance according to formula 10, process terminates to switch to maximum gear.
2. system according to claim 1, it is characterised in that: the injection coupling circuit and detection coupling circuit,
Wherein
Then
Wherein
Then
n2For coil T2 the number of turns,For the voltage at the both ends T1,To be coupled to signal detection front end electric current.
3. system according to claim 1, it is characterised in that: the signal injection unit has multiple signal amplification gears；
The current signal detection unit has multiple signal amplification gears；The high-frequency signal detection unit has multiple signal amplification shelves
Position.
4. system according to claim 1, it is characterised in that: the high-frequency digital signal frequency range is 1kHz-
100kHz。
5. system according to claim 1, it is characterised in that: the coupled modes are magnetic coupling mode.
6. a kind of impedance measurement circuit method of wide dynamic range, it is characterised in that: including,
Step 1, signal processing and control unit 104 control signal injection unit 101 and switch gear Injection SignalAnd generate height
Frequency digital signal is injected into injection coupling circuit and secondary loop of mutual inductor by DA1 and signal injection unit 101；
Step 2, injection coupling circuit and detection coupling circuit arrive Current Transformer Secondary after coupling to high-frequency digital signal
Circuit；
Step 3, the current signal of the detection injection coupling circuit of current signal detection unit 102 is by AD2 to signal processing and control
Unit 104 processed；
Step 4, the voltage signal of the detection detection coupling circuit of high-frequency signal detection unit 103 is by AD1 to signal processing and control
Unit 104 processed；
When the high frequency equivalent impedance of step 5, (1) metering secondary is smaller, signal injection unit 101 switches gear injection For the sine voltage signal that signal injection unit 101 injects, current signal detection unit 102 switches gear detection For
Injecting voltageThe electric current of generation；If detectedGreater than the 1/10 of AD2 full scale, stream method computing impedance is examined using injection,
The impedance of Injection Current transformer secondary circuit, process terminate；
Wherein
The then impedance of metering secondary
Wherein n0For coil T1 the number of turns, R0To inject front-end circuit sampling resistor, Z1cFor the high frequency equivalent of the constant frequency of coil T1
Impedance；Injecting voltage when opening a way for metering secondaryThe electric current of generation, process terminate；If the signal detected is small
In 1/10 circulation step (1) of AD full scale, if signal injection unit and current signal detection unit are to switch to maximum
Gear, the signal detected are less than the 1/10 of AD full scale, enter step (2)；
(2) when the high frequency equivalent impedance of metering secondary is larger, signal injection unit switches gear Injection SignalHigh frequency letter
Number detection unit switches gear, detectable voltage signalsIf the voltage signal detectedGreater than the 1/10 of AD1 full scale,
Using injection remelting of scrap computing impedance, process terminates；
Wherein
The impedance of metering secondary
Then
Wherein R2To detect front-end circuit sampling resistor,For the voltage for being injected into metering secondary,ForThe electricity of output
Stream,For sampling resistor R2The voltage at both ends,
The circulation step (2) if the signal detected is less than the 1/10 of AD full scale, if signal injection unit and high frequency letter
Number detection unit calculates impedance according to formula 10, process terminates to switch to maximum gear.
7. according to the method described in claim 6, it is characterized by: the injection coupling circuit and detection coupling circuit,
Wherein
Then
Wherein
Then
n2For coil T2 the number of turns,For the voltage at the both ends T1,To be coupled to signal detection front end electric current.
8. according to the method described in claim 6, it is characterized by: the signal injection unit has multiple signal amplification gears；
The current signal detection unit has multiple signal amplification gears；The high-frequency signal detection unit has multiple signal amplification shelves
Position.
9. according to the method described in claim 6, it is characterized by: the high-frequency digital signal frequency range is 1kHz-
100kHz。
10. according to the method described in claim 6, it is characterized by: the coupled modes are magnetic coupling mode.
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| CN112415460A (en) * | 2020-09-07 | 2021-02-26 | 青岛鼎信通讯股份有限公司 | Current transformer fault self-diagnosis system and method |
| CN112415287A (en) * | 2020-11-16 | 2021-02-26 | 中国电力科学研究院有限公司 | Method and system for identifying transformation ratio replacement of metering current transformer |
| WO2021111238A1 (en) * | 2019-12-02 | 2021-06-10 | Panoramic Power Ltd. | Self calibration by signal injection |
| EP3835798A1 (en) * | 2019-12-12 | 2021-06-16 | HT Italia S.r.l. | Method and apparatus for measuring the impedance of the fault loop |
| CN113504501A (en) * | 2021-09-13 | 2021-10-15 | 中国电力科学研究院有限公司 | Online error monitoring system and method for current transformer |
| CN115113130A (en) * | 2022-08-26 | 2022-09-27 | 中国电力科学研究院有限公司 | Current transformer state monitoring method and system based on high-frequency vector impedance inversion |
| CN116626391A (en) * | 2023-07-26 | 2023-08-22 | 浙江新图维电子科技有限公司 | Lead sealing impedance alternating current measurement system and method |
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