CN108594155A - A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method - Google Patents
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method Download PDFInfo
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Abstract
The invention discloses a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and methods, including critical saturation current measuring unit, supersaturated characteristic processing unit, critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, current source passes through the tested current transformer signal input part with critical saturation current measuring circuit respectively, adjustable resistance is connected, current source is also directly connected to critical saturation current measuring circuit, adjustable resistance is also connected with the adjusting output end of critical saturation current measuring circuit, saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuits.Critical saturation current of the present invention by measurement current transform er under nominal secondary load, the saturated characteristic parameter of electrical energy meter electricity current transformer is calculated, and by showing and communicating output, it is the foundation of the anti-impact of the overcurrent in short-term design of electric energy meter, has a good application prospect.
Description
Technical field
The present invention relates to a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and methods, belong to electronic, horological
Measure technical field.
Background technology
Electric energy meter needs to bear 20 times of nominal maximum current or more as a kind of high-accuracy measuring equipment in the operation of scene
Sort time overcurrent impact, the reliability that the design relation of the anti-impact of overcurrent in short-term is measured to electric energy meter, in electric energy meter designs
Need to obtain various alternative current transformers in different loads, the secondary output of current transformer when overcurrent is impacted in short-term
Parameter.
Currently, common processing mode is to remove the anti-conveyance capacity in short-term of verification electric energy meter by overcurrent experiment, lack
Point is exactly to verify after design, time-consuming and laborious if change design parameter, needs to test repeatedly；Moreover, such test needs
A kind of sort time overcurrent that can accurately export 20 times of nominal maximum current or more, output current is big, Current Transformer Secondary device
There is the risk burnt and burst, measures difficulty height and safety is low；Finally, due to the lower primary current of sort time overcurrent and secondary current
It is non-linear, so in design of Reducing Rating, need the maximum for finding electric energy meter sampling circuit by testing repeatedly that can bear electricity
The intensity of stream, is inconvenient.
How to overcome the above problem, the anti-impact property of overcurrent in short-term of electric energy meter is tested, is that current urgent need solves
's.
Invention content
The invention aims to overcome the anti-overcurrent energy in short-term for removing verification electric energy meter by overcurrent experiment in the prior art
The problems of power,.The electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method for the present invention, passes through measurement
Critical saturation current of the current transformer under nominal secondary load is calculated according to electrical energy meter electricity current transformer supersaturation characteristic
The saturated characteristic parameter of electrical energy meter electricity current transformer is obtained, and by showing and communicating output, completes the anti-mistake in short-term of electric energy meter
Impact property test is flowed, convenient test is at low cost, and security performance is high, has a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, including critical saturation current measuring unit,
Supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, institute
State current source by tested current transformer respectively with the signal input part of critical saturation current measuring circuit, adjustable resistance phase
Connection, the current source is also directly connected to critical saturation current measuring circuit, the adjustable resistance also with critical saturation current
The adjusting output end of measuring circuit is connected, and the critical saturation current measuring unit is as critical saturation current measuring unit
Interface end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuits, the MCU processor
It is connected with the interface end of critical saturation current measuring unit as the interface end of saturated characteristic processing unit, the MCU processing
Device is also connected with display screen, RS232 telecommunication circuits respectively, and the RS232 telecommunication circuits are connected with test terminal.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the current source are output low noise
The current source of power frequency sine wave current signal.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the critical saturation current measure
Circuit is AD sample circuits, and the model ADS1210 of built-in 24 bit AD sample chip, the 24 bit AD sample chip samples core
Piece.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the critical saturation current measure
It is connected by SPI communication bus between unit, supersaturated characteristic processing unit.
A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, the resistance value of the adjustable resistance can
It adjusts, constitutes nominal resistance, adjustable resistance range is arrived at 5 ohm between 1K ohm.
A kind of measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, includes the following steps,
Step (A) sends test starting order and test parameter by testing terminal, supersaturated characteristic processing unit according to
The startup order received and test parameter control critical saturation current measuring unit and are actuated for current transformer supersaturation spy
Property parameter measurement；
The resistance value of adjustable resistance is adjusted to setting value by step (B), forms nominal resistance, and starting current source, current source
Output current to tested current transformer, start from scratch linear increase at any time, and is gradually increased to by current source output current
Maximum output value；
Step (C), supersaturated characteristic processing circuit continuance test obtain the secondary current of tested current transformer output
The zero crossing of signal, and judge whether the zero crossing is saturated；If being saturated, the peak value of secondary current signal is recorded,
Stop the electric current output of current source, and executes step (D)；If current demand signal peak value is less than or equal to the peak value in last period and does not go out
It is now saturated, stops the electric current output of current source, increase adjustable resistance setting value, and execute step (B)；If current demand signal peak value is big
In the last period peak value and be not saturated, execute step (C)；
Step (D), MCU processor receive current source and stop current signal of the electric current output positioned at saturation when, and according to electricity
Energy table current transformer supersaturation characteristic, is calculated the saturated characteristic parameter of electrical energy meter electricity current transformer；
Step (E) will be calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, be shown by display screen, and pass
Give test terminal.
The measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, step (C), judging should
Whether zero crossing is saturated, and is when being saturated according to the magnetic core of current transformer, the output current of current transformer will be fallen to
Zero realization, whether zero passage is shifted to an earlier date by the waveform of sensed current signal, if zero passage in advance, and CT saturation.
The measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, step (D), according to electricity
Energy table current transformer supersaturation characteristic is the approximate pure resistance characteristic of secondary load.
The measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system above-mentioned, step (D) calculate
To the saturated characteristic parameter of electrical energy meter electricity current transformer, include the following steps,
(D1), due to the approximate pure resistance of the secondary load of electrical energy meter electricity current transformer, then secondary current and induced electromotive force at
Direct ratio, then the magnetic flux Φ of current transformer is the integral of secondary current, is shown below：
φ=(1/N2)∫e2Dt=(R/N2)∫I2dt
Wherein, N2For secondary the number of turns, e2It is secondary impedance, I for induced electromotive force, R2For secondary current；
(D2), when phase is from 0 degree to 180 degree definite integral, the current transformer magnetic flux of acquisition is saturation flux φ max, electricity
Current transformer is in critical saturation state, is shown below：
Wherein, current source increase primary current time between zero crossing occurs in the output of secondary current shortens, then once
Electric current is that critical saturation current virtual value is I1pumn, the peak I of corresponding secondary current2pun；
(D3), since the saturation flux φ max of current transformer are immutable, under critical saturation, secondary impedance R and I2punAt
Inverse ratio, when secondary impedance is adjusted to Rde from R, secondary current peak value I under corresponding critical saturation2pu, it is shown below：
I2pu=R/Rde*I2pun
(D4), the electric energy meter sort time overcurrent virtual value to be met is I1maxm, peak value I1max, can not based on saturation flux
The characteristic of change obtains phase x when saturation, is shown below：
Wherein, phase when x is saturation indicates that when primary current be I1max, when phase is x or 180+x, magnetic core is saturated,
And secondary current output is zero；
(D5), phase x when according to saturation, calculate during the virtual value, peak value, unsaturation of secondary current virtual value and
It the unsaturation time, is shown below：
The peak I of secondary current2mFor
I2m=I1max/N2sinx；
The virtual value I of secondary current2For
Virtual value I during the unsaturation of secondary current2＇ is
The unsaturation time t of secondary current is
T=ω/x.
The beneficial effects of the invention are as follows：The electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the present invention and side
Method is satiated by critical saturation current of the measurement current transform er under nominal secondary load according to electrical energy meter electricity current transformer
And characteristic, the saturated characteristic parameter of electrical energy meter electricity current transformer is calculated, and be that electric energy meter is anti-by showing and communicating output
The foundation of the design of overcurrent impact in short-term, to realize the anti-impact property of the overcurrent in short-term test of electric energy meter, convenient test, cost
It is low, and security performance is high, has a good application prospect.
Description of the drawings
Fig. 1 is the system block diagram of the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the present invention；
Fig. 2 is the flow chart of the electrical energy meter electricity current transformer supersaturation characterisitic parameter measurement method of the present invention；
Fig. 3 be the present invention saturation when current transformer output current by fall to zero schematic diagram.
Specific implementation mode
Below in conjunction with Figure of description, the present invention will be further described.Following embodiment is only used for clearly
Illustrate technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system of the present invention, including critical saturation
Current measuring unit, supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, institute
State current source by tested current transformer respectively with the signal input part of critical saturation current measuring circuit, adjustable resistance phase
Connection, the current source is also directly connected to critical saturation current measuring circuit, the adjustable resistance also with critical saturation current
The adjusting output end of measuring circuit is connected, and the critical saturation current measuring unit is as critical saturation current measuring unit
Interface end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuits, the MCU processor
It is connected with the interface end of critical saturation current measuring unit as the interface end of saturated characteristic processing unit, the MCU processing
Device is also connected with display screen, RS232 telecommunication circuits respectively, and the RS232 telecommunication circuits are connected with test terminal.
Preferably, the current source is the current source of output low noise power frequency sine wave current signal, receives startup
Start the power frequency sine wave current signal of output low noise after signal, the current signal of output gradually increases at any time, works as reception
Output current signal is reduced to zero after to stop signal.
Preferably, the critical saturation current measuring circuit be AD sample circuits, built-in 24 bit AD sample chip, described 24
The model ADS1210 sampling A/D chips of bit AD sample chip, the voltage signal for measuring adjustable resistance both ends, and converted
For the current value of the secondary output of tested current transformer.And the zero crossing interval time by detecting measuring signal, work as detection
It shortens to the interval time between signal zero-crossing, then it is assumed that saturated phenomenon occurs in tested current transformer, records tested letter
Number peak value and output.
Preferably, pass through SPI communication bus between the critical saturation current measuring unit, supersaturated characteristic processing unit
It is connected, traffic rate is fast, and reliability is high.
Preferably, the resistance value of the adjustable resistance is adjustable, constitutes nominal resistance, and adjustable resistance range arrives the Europe 1K at 5 ohm
Between nurse.
According to above-mentioned electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, electric energy meter current of the invention is mutual
Sensor supersaturation characterisitic parameter measurement method, as shown in Fig. 2, include the following steps,
Step (A) sends test starting order and test parameter by testing terminal, supersaturated characteristic processing unit according to
The startup order received and test parameter control critical saturation current measuring unit and are actuated for current transformer supersaturation spy
Property parameter measurement；
The resistance value of adjustable resistance is adjusted to setting value by step (B), forms nominal resistance, and starting current source, current source
Output current to tested current transformer, start from scratch linear increase at any time, is gradually increased to most by current source output current
Big output valve；
Step (C), supersaturated characteristic processing circuit continuance test obtain the secondary current of tested current transformer output
The zero crossing of signal, and judge whether the zero crossing is saturated；If being saturated, the peak value of secondary current signal is recorded,
Stop the electric current output of current source, and executes step (D)；If current demand signal peak value is less than or equal to the peak value in last period and does not go out
It is now saturated, stops the electric current output of current source, increase adjustable resistance setting value, and execute step (B)；If current demand signal peak value is big
In the last period peak value and be not saturated, execute step (C)；
Wherein, judge whether the zero crossing is saturated, be current transformer when being saturated according to the magnetic core of current transformer
Output current will fall to zero realization, as shown in figure 3, the process of decline is rapid and the time is extremely short, pass through sensed current signal
Waveform whether shift to an earlier date zero passage, if zero passage in advance, and CT saturation；
Step (D), MCU processor receive current source and stop current signal of the electric current output positioned at saturation when, and according to electricity
Energy table current transformer supersaturation characteristic, is calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, wherein electrical energy meter electricity
Current transformer supersaturation characteristic is the approximate pure resistance characteristic of secondary load, and the saturated characteristic ginseng of electrical energy meter electricity current transformer is calculated
Number, includes the following steps,
(D1), due to the approximate pure resistance of the secondary load of electrical energy meter electricity current transformer, then secondary current and induced electromotive force at
Direct ratio, then the magnetic flux φ of current transformer is the integral of secondary current, is shown below：
φ=(1/N2)∫e2Dt=(R/N2)∫I2dt
Wherein, N2For secondary the number of turns, e2It is secondary impedance, I for induced electromotive force, R2For secondary current；
(D2), when phase is from 0 degree to 180 degree definite integral, the current transformer magnetic flux of acquisition is saturation flux φ max, electricity
Current transformer is in critical saturation state, is shown below：
Wherein, current source increase primary current time between zero crossing occurs in the output of secondary current shortens, then once
Electric current is that critical saturation current virtual value is I1pumn, the peak I of corresponding secondary current2pun；
(D3), since the saturation flux φ max of current transformer are immutable, under critical saturation, secondary impedance R and I2punAt
Inverse ratio, when secondary impedance is adjusted to R from Rde, secondary current peak value I under corresponding critical saturation2pu, it is shown below：
I2pu=R/Rde*I2pun
(D4), the electric energy meter sort time overcurrent virtual value to be met is I1maxm, peak value I1max, can not based on saturation flux
The characteristic of change obtains phase x when saturation, is shown below：
Wherein, phase when x is saturation indicates that when primary current be I1max, when phase is x or 180+x, magnetic core is saturated,
And secondary current output is zero；
(D5), phase x when according to saturation, calculate during the virtual value, peak value, unsaturation of secondary current virtual value and
It the unsaturation time, is shown below：
The peak I of secondary current2mFor
I2m=I1max/N2sinx；
The virtual value I of secondary current2For
Virtual value I during the unsaturation of secondary current2' be
The unsaturation time t of secondary current is
T=ω/x；
Step (E) will be calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, be shown by display screen, and pass
Give test terminal.
In conclusion the electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system and method for the present invention, pass through survey
Critical saturation current of the current transformer under nominal secondary load is measured, according to electrical energy meter electricity current transformer supersaturation characteristic, meter
Calculation obtains the saturated characteristic parameter of electrical energy meter electricity current transformer, and is the anti-overcurrent in short-term of electric energy meter by showing and communicating output
The foundation for impacting design, to realize the anti-impact property of the overcurrent in short-term test of electric energy meter, convenient test is at low cost, and safety
Performance is high, has a good application prospect.
The basic principles and main features and advantage of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe the originals of the present invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (9)
1. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system, it is characterised in that：Including critical saturation current
Measuring unit, supersaturated characteristic processing unit,
The critical saturation current measuring unit, including current source, adjustable resistance, critical saturation current measuring circuit, the electricity
Stream source is connected with signal input part, the adjustable resistance of critical saturation current measuring circuit respectively by tested current transformer
It connects, the current source is also directly connected to critical saturation current measuring circuit, and the adjustable resistance is also surveyed with critical saturation current
The adjusting output end of amount circuit is connected, critical saturation current measuring unit the connecing as critical saturation current measuring unit
Mouth end is connected with the interface end of supersaturated characteristic processing unit,
The saturated characteristic processing unit, including MCU processor, display screen, RS232 telecommunication circuits, the MCU processor as
The interface end of saturated characteristic processing unit is connected with the interface end of critical saturation current measuring unit, and the MCU processor is also
It is connected respectively with display screen, RS232 telecommunication circuits, the RS232 telecommunication circuits are connected with test terminal.
2. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The current source is the current source for exporting low noise power frequency sine wave current signal.
3. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The critical saturation current measuring circuit is AD sample circuits, built-in 24 bit AD sample chip, the 24 bit AD sample chip
Model ADS1210 sampling A/D chips.
4. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：It is connected by SPI communication bus between the critical saturation current measuring unit, supersaturated characteristic processing unit.
5. a kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 1, feature exist
In：The resistance value of the adjustable resistance is adjustable, constitutes nominal resistance, and adjustable resistance range is arrived at 5 ohm between 1K ohm.
6. the measurement based on claim 1-5 any one of them electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring systems
Method, it is characterised in that：Include the following steps,
Step (A) sends test starting order and test parameter by testing terminal, and supersaturated characteristic processing unit is according to reception
The startup order arrived and test parameter control critical saturation current measuring unit and are actuated for current transformer supersaturation characteristic ginseng
Number measures；
The resistance value of adjustable resistance is adjusted to setting value by step (B), forms nominal resistance, and starting current source, current source output
Electric current to tested current transformer, start from scratch linear increase at any time, and is gradually increased to maximum by current source output current
Output valve；
Step (C), supersaturated characteristic processing circuit continuance test obtain the secondary current signal of tested current transformer output
Zero crossing, and judge whether the zero crossing is saturated；If being saturated, the peak value of secondary current signal is recorded, is stopped
The electric current of current source exports, and executes step (D)；If current demand signal peak value is less than or equal to the peak value in last period and does not satisfy
With stop the electric current output of current source, increase adjustable resistance setting value, and execute step (B)；If current demand signal peak value is more than upper
It the peak value in a period and is not saturated, executes step (C)；
Step (D), MCU processor receive current source and stop current signal of the electric current output positioned at saturation when, and according to electric energy meter
The saturated characteristic parameter of electrical energy meter electricity current transformer is calculated in current transformer supersaturation characteristic；
Step (E) will be calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, be shown by display screen, and send to
Test terminal.
7. the measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 6,
It is characterized in that：Step (C), judges whether the zero crossing is saturated, and is when being saturated according to the magnetic core of current transformer, electric current is mutual
The output current of sensor will fall to zero realization, whether shift to an earlier date zero passage by the waveform of sensed current signal, if zero passage in advance,
And CT saturation.
8. the measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 6,
It is characterized in that：Step (D) is the approximate pure resistance characteristic of secondary load according to electrical energy meter electricity current transformer supersaturation characteristic.
9. the measurement method of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system according to claim 8,
It is characterized in that：Step (D) is calculated the saturated characteristic parameter of electrical energy meter electricity current transformer, includes the following steps,
(D1), due to the approximate pure resistance of the secondary load of electrical energy meter electricity current transformer, then secondary current is directly proportional to induced electromotive force,
Then the magnetic flux φ of current transformer is the integral of secondary current, is shown below：
φ=(1/N2)∫e2Dt=(R/N2)∫I2dt
Wherein, N2For secondary the number of turns, e2It is secondary impedance, I for induced electromotive force, R2For secondary current；
(D2), when phase is from 0 degree to 180 degree definite integral, the current transformer magnetic flux of acquisition is saturation flux φ max, and electric current is mutual
Sensor is in critical saturation state, is shown below：
Wherein, current source increase primary current time between zero crossing occurs in the output of secondary current shortens, then primary current
It is I for critical saturation current virtual value1pumn, the peak I of corresponding secondary current2pun；
(D3), since the saturation flux φ max of current transformer are immutable, under critical saturation, secondary impedance R and I2punIt is inversely proportional,
When secondary impedance is adjusted to R from Rde, secondary current peak value I under corresponding critical saturation2pu, it is shown below：
I2pu=R/Rde*I2pun
(D4), the electric energy meter sort time overcurrent virtual value to be met is I1maxm, peak value I1max, immutable based on saturation flux
Characteristic obtains phase x when saturation, is shown below：
Wherein, phase when x is saturation indicates that when primary current be I1max, when phase is x or 180+x, magnetic core is saturated, and two
Primary current output is zero；
(D5), phase x when according to saturation, virtual value and non-full during calculating the virtual value, peak value, unsaturation of secondary current
And the time, it is shown below：
The peak I of secondary current2mFor
I2m=I1max/N2sinx；
The virtual value I of secondary current2For
Virtual value I during the unsaturation of secondary current2' be
The unsaturation time t of secondary current is
T=ω/x.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298370A (en) * | 2018-11-23 | 2019-02-01 | 广州供电局有限公司 | The detection method and device of the characteristic of mutual inductor |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| WO2021003719A1 (en) * | 2019-07-10 | 2021-01-14 | Abb Schweiz Ag | Sensing apparatus and sensing method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2645465A1 (en) * | 1975-10-10 | 1977-04-21 | Gen Electric | PROCEDURE AND ARRANGEMENT FOR DETERMINING THE APPEARANCE OF MAGNETIC SATURATION IN A TRANSFORMER CORE |
| US4456875A (en) * | 1981-07-07 | 1984-06-26 | Hydro-Quebec | Demagnetization circuit for current transformers |
| CN102809678A (en) * | 2012-08-03 | 2012-12-05 | 江苏林洋电子股份有限公司 | Device for improving current sampling linear range and electric energy measuring accuracy of electric energy meter |
| JP2013096848A (en) * | 2011-11-01 | 2013-05-20 | Hirose Electric Co Ltd | Current sensor |
| CN103176147A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Current transformer remanence measurement system and method |
| CN104122524A (en) * | 2014-07-31 | 2014-10-29 | 国家电网公司 | Method and system for lowering measuring error of current transformer |
| CN104251948A (en) * | 2014-10-22 | 2014-12-31 | 华自科技股份有限公司 | Test device and test method suitable for differential protection detection of CT (current transformer) saturation |
| US20150108967A1 (en) * | 2013-10-21 | 2015-04-23 | Guildline Instruments Limited | Methods and Systems Relating to AC Current Measurements |
| KR20160116832A (en) * | 2015-03-31 | 2016-10-10 | 명지대학교 산학협력단 | Current transformer saturation detection method and apparatus |
| CN106842099A (en) * | 2017-04-10 | 2017-06-13 | 国家电网公司 | A kind of CT saturation recognition methods and device |
| CN106873461A (en) * | 2017-03-02 | 2017-06-20 | 国家电网公司 | A kind of control method of remanence of current transformer degaussing gear |
| CN107340489A (en) * | 2017-07-05 | 2017-11-10 | 广东电网有限责任公司电力科学研究院 | A kind of CT saturation detection method and device |
| CN208110026U (en) * | 2018-04-28 | 2018-11-16 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system |
-
2018
- 2018-04-28 CN CN201810396782.3A patent/CN108594155B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2645465A1 (en) * | 1975-10-10 | 1977-04-21 | Gen Electric | PROCEDURE AND ARRANGEMENT FOR DETERMINING THE APPEARANCE OF MAGNETIC SATURATION IN A TRANSFORMER CORE |
| US4456875A (en) * | 1981-07-07 | 1984-06-26 | Hydro-Quebec | Demagnetization circuit for current transformers |
| JP2013096848A (en) * | 2011-11-01 | 2013-05-20 | Hirose Electric Co Ltd | Current sensor |
| CN102809678A (en) * | 2012-08-03 | 2012-12-05 | 江苏林洋电子股份有限公司 | Device for improving current sampling linear range and electric energy measuring accuracy of electric energy meter |
| CN103176147A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Current transformer remanence measurement system and method |
| US20150108967A1 (en) * | 2013-10-21 | 2015-04-23 | Guildline Instruments Limited | Methods and Systems Relating to AC Current Measurements |
| CN104122524A (en) * | 2014-07-31 | 2014-10-29 | 国家电网公司 | Method and system for lowering measuring error of current transformer |
| CN104251948A (en) * | 2014-10-22 | 2014-12-31 | 华自科技股份有限公司 | Test device and test method suitable for differential protection detection of CT (current transformer) saturation |
| KR20160116832A (en) * | 2015-03-31 | 2016-10-10 | 명지대학교 산학협력단 | Current transformer saturation detection method and apparatus |
| CN106873461A (en) * | 2017-03-02 | 2017-06-20 | 国家电网公司 | A kind of control method of remanence of current transformer degaussing gear |
| CN106842099A (en) * | 2017-04-10 | 2017-06-13 | 国家电网公司 | A kind of CT saturation recognition methods and device |
| CN107340489A (en) * | 2017-07-05 | 2017-11-10 | 广东电网有限责任公司电力科学研究院 | A kind of CT saturation detection method and device |
| CN208110026U (en) * | 2018-04-28 | 2018-11-16 | 国网江苏省电力有限公司电力科学研究院 | A kind of electrical energy meter electricity current transformer supersaturation characterisitic parameter measuring system |
Non-Patent Citations (2)
| Title |
|---|
| DETECTION OF SATURATION OF CORE OF CURRENT TRANSFORMER USING COMBINED FEATURE OF HILBERT TRANSFORM AND STOCKWELL TRANSFORM 等: "Operating characteristics of the Permanent-Magnet-Biased Saturation Based Fault Current Limiter", 《2008 INTERNATIONAL CONFERENCE ON HIGH VOLTAGE ENGINEERING AND APPLICATION》, 3 February 2009 (2009-02-03) * |
| 陆泉森 等: "电流互感器大电流饱和测试技术与实现方法研究", 《 中国设备工程》, 10 May 2017 (2017-05-10) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298370A (en) * | 2018-11-23 | 2019-02-01 | 广州供电局有限公司 | The detection method and device of the characteristic of mutual inductor |
| CN109298370B (en) * | 2018-11-23 | 2021-06-18 | 广东电网有限责任公司广州供电局 | Method and device for detecting characteristics of mutual inductor |
| CN109490809A (en) * | 2018-12-12 | 2019-03-19 | 威胜信息技术股份有限公司 | The unpaired calibration method of CT DC current return |
| WO2021003719A1 (en) * | 2019-07-10 | 2021-01-14 | Abb Schweiz Ag | Sensing apparatus and sensing method |
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