CN208818818U - A kind of low-power consumption program control type current mutual inductor field detecting device - Google Patents
A kind of low-power consumption program control type current mutual inductor field detecting device Download PDFInfo
- Publication number
- CN208818818U CN208818818U CN201821225207.9U CN201821225207U CN208818818U CN 208818818 U CN208818818 U CN 208818818U CN 201821225207 U CN201821225207 U CN 201821225207U CN 208818818 U CN208818818 U CN 208818818U
- Authority
- CN
- China
- Prior art keywords
- current
- control type
- program control
- mutual
- current transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A kind of low-power consumption program control type current mutual inductor field detecting device of the utility model, belongs to mutual inductor detection technique field, mainly solves the problems, such as that power consumption is high when current mutual inductor field detecting, a high current conducting wire connection is difficult, total current up-flow is difficult.Including program control type electronic power source, current lifting device, standard current transformer, current capacity case, advance signal switch control unit and program control type mutual-inductor tester.The program-controlled electronic power source output terminal connects current lifting device input terminal, current lifting device output end provides primary current for standard current transformer and tested current transformer, the input advance signal switching of secondary current or voltage signal and control unit of the two complete signal conversion, signal after conversion is handled through program control type mutual-inductor tester, carries out error measure and secondary excitation current measurement.A required wire weight considerably reduces, and easily connects, and the output of verification process power supply and the acquisition of measurement point error information are program control type, guarantees accuracy of measurement, improves efficiency.
Description
Technical field
The invention belongs to mutual inductor detection technique fields, and in particular to a kind of low-power consumption program control type current mutual inductor on site inspection
Determine device.
Background technique
According to JJG313-2010 " Verification of Measuring Current Transformer " and JJG1021-2007 " electric power mutual-inductor " vertification regulation
Regulation: the measurement point of electric power mutual-inductor is 1%, 5%, 20%, 100%, 120% rated current point, for high current and high pressure
Mutual inductor preferably reads calibrating data after the lifting of gamut at least once.Due to primary current when on-site proving current transformer
Impedance loop is big, loop pressure drop is big, and required power supply capacity measures the far super field power supply of power consumption from several kilovolt-amperes to up to a hundred kilovolt-amperes
Condition, in addition required high current conductor length is long when measurement, weight weight, connects difficulty, and up-flow is difficult when causing to test, very
Difficulty tests tested mutual inductor under total current.
Summary of the invention
Present invention mainly solves power consumptions when current mutual inductor field detecting, and a high, high current conducting wire connects difficult, full electricity
The difficult problem of stream up-flow, provides a kind of low-power consumption program control type current mutual inductor field detecting device.
The present invention provides a kind of low-power consumption program control type current mutual inductor field detecting devices.It is existing to solve current transformer
Power consumption is high when the calibrating of field, a high current conducting wire connection is difficult, total current flows up difficult technical problem, realizes and utilizes this Shen
Please in device low-power consumption, program control type automatic measurement, technical effect high-efficient, accuracy is high.Existing device is made full use of, is adopted
With dedicated program controled power source and program control type mutual-inductor tester, it is not only effectively utilized measuring appliance, but also can solve on-the-spot test
Technical problem, reached and reduced expenses, highly effective and safe detection management efficiency.
It requires to guarantee that accuracy of measurement, problem low in energy consumption, the application mention when in order to solve current mutual inductor field detecting
A kind of low-power consumption program control type current mutual inductor field detecting device, device maximum output 400A primary current, and electricity herein are supplied
1%, 5%, 20% rated current point of measurement error under upper limited load and lower limited load is flowed down, is then surveyed in 400A primary current
Amount point starts directly to survey an exciting current and convert to secondary excitation electric current, calculates this exciting current corresponding to specified secondary electricity
Uncompensated error is flowed, 20%, 100%, 120% rated current point tolerance is extrapolated.Since primary current maximum output is
400A, power consumption needed for measuring circuit are reduced to the 20% of original required power consumption, and primary circuit is small by electric current, a required conducting wire weight
Amount considerably reduces, and is easy connection, and entire verification process power supply output and the acquisition of measurement point error information are program control type, ensure that survey
Accuracy is measured, while improving efficiency.
The present invention adopts the technical scheme that solve above-mentioned technical problem:
A kind of low-power consumption program control type current mutual inductor field detecting device, including program control type electronic power source, current lifting device, mark
Quasi- current transformer, current capacity case, advance signal switch control unit and program control type mutual-inductor tester.The program control type electricity
Sub- power source output terminal connects current lifting device input terminal, and current lifting device output end is that standard current transformer and tested current transformer mention
For primary current, secondary current or voltage signal the input advance signal switch control unit of the two complete signal conversion, conversion
Signal afterwards is handled through program control type mutual-inductor tester, carries out error measure and secondary excitation current measurement.
Further, program control type electronic power source includes power amplifier and control unit.The power amplifier input
Voltage is AC220V, and output voltage is 0~250V of AC, fineness adjustment 0.1V, 1~5kVA of output power, and power amplifier was both protected
The power output for having demonstrate,proved test loop in turn ensures the accurate measurement of 1%, 5%, 20% rated current point of small current measurement point,
And small voltage signal fine-tunes；Described control unit realizes programmed logic control, according to mutual-inductor tester
Measurement point output signal controls power amplifier voltage lifting, realizes the purpose of measurement process program controlled automatic.
Further, current lifting device input voltage is 0~250V, and output voltage is 2.5V~10V, maximum output current
2000A guarantees the output of 400A electric current in the case where the big pressure drop of test loop load is big, and the current lifting device is mainly standard electric
Current transformer and tested current transformer provide primary current.
Further, standard current transformer electric current ratio is 5~2000/5A, 1A class of accuracy is 0.02S grades, normalized current
Mutual inductor is used as standard verification device, is compared with tested current transformer, class of accuracy is at least higher by 2 than tested current transformer
A accuracy grade, to guarantee measurement accuracy, class of accuracy meets vertification regulation requirement.
Further, current capacity case operating current is 5A or 1A, and load range is 2.5~80VA, and precision is ± 3%,
For simulating the workload of tested current transformer, performance indicator meets vertification regulation requirement.
Further, advance signal switch control unit includes the sampling of standard secondary singal, difference current and exciting current
Sampling, induced electromotive force sampling and working condition logic control and signal switching, the advance signal switching correspond to tester
Error testing working condition and exciting current test job state, described control unit is to control program control type electronic power source electricity
The logic control of pressure output lifting and signal switching.
Further, program control type mutual-inductor tester includes input signal sampling, signal processing, A/D conversion, data analysis
It calculates and data display storage, the program control type mutual-inductor tester is mainly used to read the error information and ginseng of tested mutual inductor
Several readings.
Further, device workflow is as follows:
1) by program control type electronic power source, current lifting device, standard current transformer, current capacity case, program control type mutual inductor school
Instrument and tested current transformer are tested, " electric power is mutual according to JJG313-2010 " Verification of Measuring Current Transformer " and JJG1021-2007
Sensor " current transformer comparison method examines and determine connections in vertification regulation.
2) rated primary current of the tested current transformer of device input, rated secondary current, upper limited load, lower limit are negative
Lotus, the relevant parameters such as accuracy rating.
3) device starting is tested 1%, 5%, 20% rated current point tolerance and is automatically recorded.
4) after device output voltage retracts zero-bit, starting exciting current is tested and records 20%, 100%, 120% specified electricity
Corresponding lower 3 exciting currents of induced potential are flowed, 20%, 100%, 120% 3 point tolerance is directly displayed.
5) changing tested current transformer secondary load is lower limited load, repeat it is above 1), 2), 3), 4) step, measure
Error under limited load under tested current transformer.
One or more technical solution provided by the present application, at least has the following technical effects or advantage:
The present invention when examining and determine on-site current transformer according to JJG313-2010 " Verification of Measuring Current Transformer " and
Current transformer comparison method examines and determine connections in JJG1021-2007 " electric power mutual-inductor " vertification regulation, and it is mutual to survey tested electric current
For sensor in 1%, 5%, 20% point tolerance, error information is true and reliable；When surveying exciting current calculating error, without thread-changing, dress
It sets and advance signal is switched over automatically, it is simple and fast, it is easily operated；Primary current need only be raised to 400A, test loop power consumption
It substantially reduces, connecting wire weight considerably reduces；Program control type test can guarantee accurate sampling, improve test accuracy；Thoroughly
Solves the difficult technical problem of scene up-flow.
Detailed description of the invention
Fig. 1 is principle of the invention figure；
Fig. 2 is program control type mutual-inductor tester functional block diagram of the present invention.
In figure: 101-program control type electronic power sources, 102-current lifting devices, 103-standard current transformers, 104-is tested
Current transformer, 105-current capacity casees, 106-advance signal switch control units, 107-program control type mutual-inductor testers；
201-normalized current converters, 202-voltage signal converters, 203-low current samplers；301-data process&analysis
Comparator, 302-data display equipments；L-alternating current hot terminal, N-alternating current zero curve terminals；A-program control type electronic power
The input high-voltage end in source, X-program control type electronic power source input low-pressure end, a-program control type electronic power source output high pressure
End, x-program control type electronic power source output low-pressure end；250V-current lifting device inputs high-voltage end, and ±-current lifting device inputs low pressure
End, La-current lifting device output polarity end, Lb-current lifting device output non-polar end；L1-standard current transformer is primary
Polar end: non-polar end of L2-standard current transformer, K1-standard current transformer secondary polarity end；K2-mark
The secondary non-polar end of quasi- current transformer；P1-is detected a polar end of current transformer；P2-is detected current transformer
A non-polar end, S1-be detected current transformer secondary polarity end；S2-is detected the secondary nonpolarity of current transformer
End；T0-normalized current inputs polar end, Tx-normalized current ground terminal, and K-difference current and induced voltage input polar end,
D-difference current and induced voltage ground terminal；CT1-normalized current converter, CT2-low current sampler, PT-voltage letter
Number converter；R-normalized current converter sample resistance；R1-low current sampler sample resistance；U-voltage signal
The voltage signal of converter；Δ U-low current sampler small voltage signal；J1-No.1 relay；No. bis- relays of J2-
Device；No. tri- relays of J3-.
Specific embodiment
As shown in Figure 1, device includes program control type electronic power source 101, current lifting device 102, standard current transformer 103, quilt
Examine current transformer 104, current capacity case 105, advance signal switch control unit 106, program control type mutual-inductor tester 107；
Its main feature is that: it is accessed between the input high-voltage end A in program control type electronic power source and the input low-pressure end X in program control type electronic power source
The alternating current hot terminal L and alternating current zero curve terminals N-terminal of AC220V power supply, the output high-voltage end a in program control type electronic power source
Current lifting device input high-voltage end 250V and the current lifting device input of current lifting device 102 are connect with the output low-pressure end x in program control type electronic power source
Low-pressure end ±, the output polarity end La of current lifting device and the output non-polar end Lb of current lifting device connect the one of standard current transformer respectively
A non-polar end P2 of secondary non-polar end L2 and tested current transformer, a polar end L1 of standard current transformer and by
A polar end P1 for examining current transformer is shorted, the secondary non-polar end K2 of standard current transformer and tested current transformer
Secondary non-polar end S2 meet the normalized current input polar end T0 and current capacity of advance signal switch control unit 106 respectively
One end of case 105, the secondary polarity end K1 of standard current transformer and the secondary polarity end S1 of tested current transformer are shorted,
The secondary polarity end K1 of Plays current transformer connect advance signal switch control unit 106 difference current and induced voltage it is defeated
Enter polar end K, the end normalized current ground terminal Tx of another termination advance signal switch control unit 106 of current capacity case 105,
The difference current and induced voltage ground terminal D of advance signal switch control unit 106 are grounded.The program control type mutual-inductor tester
107 include advance signal switch control unit 106, data process&analysis comparator 301, data display equipment 302, before described
Confidence switch control unit 106 includes No.1 relay J1, No. two relay J2, No. three relay J3 and normalized current conversion
Device 201, voltage signal converter 202, low current sampler 203.The No.1 relay J1, No. two relay J2, No. three after
Electric appliance J3 inputs pole for switching standards electric current input polar end To, normalized current ground terminal Tx and difference current and induced voltage
The input signal of property end K, difference current and induced voltage ground terminal D, only when surveying secondary excitation electric current, No.1 relay
J1, No. two relay J2, No. three relay J3 movements, normalized current converter 201 are used for the secondary letter of standard current transformer
Number being converted to the voltage signal U, R that virtual value is 2V is sample resistance, R=100 Ω, and voltage signal converter 202 is for will be by
Inspection Current Transformer Secondary induced potential is converted to the voltage signal U that virtual value is 4V, and low current sampler 203 will be for that will compare
Difference current or tested mutual inductor secondary excitation electric current Δ I2 are converted to small voltage signal delta U in method calibrating route, and R1 is sampling
Resistance, R1=1k Ω, the data process&analysis comparator 301 are used to carry out the signal U and small voltage signal delta U of input
Amplification, filtering, analysis are compared, and in-phase component f and quadrature component δ are decomposed into, and data display equipment 302 is used for real-time display margin of error
According to result.
A kind of low-power consumption program control type current mutual inductor field detecting test method, its main feature is that: include the following steps:
1) device tests rated current percentage 1%, 5% point tolerance point under upper limited load, lower limited load, no-load condition
Not Wei ε n1, ε n5, ε x1, ε x5, ε o1, ε o5 error and record.
Error expression are as follows:
In formula (1)For electric current percentage i point tolerance, fiIt is electric current percentage i point than difference, δiFor electric current percentage i point
Phase difference, so measurement obtains being detected current transformer in 1%, 5% current point under limited load, lower limited load, no-load condition
Error be respectively as follows:
2) device continues the automatic electric current that rises to primary current 400A, is corresponding to electric current percentageWherein
I1n is rated primary current, measures upper limited load ε m and no-load error ε mo at this time, and record, then
Again
Z in formula (10)2To be detected mutual inductor secondary winding internal impedance, Ym is excitation admittance, and ε b is offset, constant.
To formula (10) differentiation, then
dεm=Z2dYm (11)
Therefore measure d εmAnd dYmIt can obtain
3) drop voltage calculates tested mutual inductor in the electric current percentage induced electricity of m%, 20%, 100% and 120% to zero
Gesture Em, E100、E120。
Wherein
Formula (13), (14), (15), in (16)Respectively m%, 20%, 100%,
120% secondary current, Z is tested current transformer secondary load, by being detected the direct-reading of mutual inductor nameplate.
4) in the rated current point of m%, 20%, 100%, 120% corresponding secondary induced potential Em, E20、E100、 E120Under
It directly surveys an exciting current and converts and arrive secondary excitation electric currentCurrent transformer error is caused by exciting current, by electricity
Known to the definition of current transformer error:
WhereinFor secondary excitation electric current,For the uncompensated error of current transformer, then:
By (18), (19), (20), (21) it is found that
By (22), (23), (24) it is found that directly measuring secondary induced potential Em, E20、E100、E120Lower exciting currentCurrent transformer can be obtained 20%, 100%, 120% 3 under rated load
Point tolerance, can be measured when similarly Z is lower limited load under tested mutual inductor error under limited load be ε x20, ε x100, ε x120.
The present invention when examining and determine on-site current transformer according to JJG313-2010 " Verification of Measuring Current Transformer " and
Current transformer comparison method examines and determine connections in JJG1021-2007 " electric power mutual-inductor " vertification regulation, and it is mutual to survey tested electric current
For sensor in 1%, 5%, 20% point tolerance, error information is true and reliable；When surveying exciting current calculating error, without thread-changing, dress
It sets and advance signal is switched over automatically, it is simple and fast, it is easily operated；Primary current need only be raised to 400A, test loop power consumption
It substantially reduces, connecting wire weight considerably reduces；Program control type test can guarantee accurate sampling, improve test accuracy；Thoroughly
Solves the difficult technical problem of scene up-flow.
Claims (7)
1. a kind of low-power consumption program control type current mutual inductor field detecting device, including program control type electronic power source (101), current lifting device
(102), standard current transformer (103), current capacity case (105), advance signal switch control unit (106) and program control type are mutual
Sensor tester (107)；It is characterized in that, program control type electronic power source (101) output end connection current lifting device (102) input
End, current lifting device (102) output end are standard current transformer (103) and tested current transformer (104) offer primary current, two
Signal conversion, the letter after conversion are completed in the input advance signal switching of secondary current or voltage signal and control unit (106) of person
It number is handled through program control type mutual-inductor tester (107), carries out error measure and secondary excitation current measurement.
2. low-power consumption program control type current mutual inductor field detecting device according to claim 1, it is characterised in that: the journey
Control formula electronic power source (101) includes power amplifier and control unit；The power amplifier input voltage is AC220V, defeated
Voltage is 0~250V of AC, fineness adjustment 0.1V, 1~5kVA of output power out, and power amplifier both ensure that test loop
Power output in turn ensures accurate measurement and the small voltage signal of 1%, 5%, 20% rated current point of small current measurement point
Fine-tune；Described control unit realizes programmed logic control, according to the measurement point output signal of mutual-inductor tester
Power amplifier voltage lifting is controlled, realizes the purpose of measurement process program controlled automatic.
3. low-power consumption program control type current mutual inductor field detecting device according to claim 1, which is characterized in that the liter
Stream device (102) input voltage is 0~250V, and output voltage is 2.5V~10V, maximum output current 2000A, is born in test loop
Lotus is big, guarantees the output of 400A electric current in the case that pressure drop is big, the current lifting device (102) is mainly standard current transformer (103)
Primary current is provided with tested current transformer (104).
4. low-power consumption program control type current mutual inductor field detecting device according to claim 1, which is characterized in that the mark
Quasi- current transformer (103) electric current ratio is 5~2000/5A, 1A class of accuracy is 0.02S grades, and standard current transformer (103) is used as
Standard verification device is compared with tested current transformer (104), class of accuracy 2 standards at least higher than tested current transformer
Exactness rank, to guarantee measurement accuracy, class of accuracy meets vertification regulation requirement.
5. low-power consumption program control type current mutual inductor field detecting device according to claim 1, it is characterised in that: the electricity
Stream load case (105) operating current is 5A or 1A, and load range is 2.5~80VA, and precision is ± 3%, for simulating tested electricity
The workload of current transformer, performance indicator meet vertification regulation requirement.
6. low-power consumption program control type current mutual inductor field detecting device according to claim 1, it is characterised in that: before described
Confidence switch control unit (106) includes the sampling of standard secondary singal, difference current and exciting current sampling, induced electromotive force
Sampling and working condition logic control and signal switching, the advance signal switching correspond to tester error testing working condition
With exciting current test job state, described control unit is to control the lifting of program control type electronic power source voltage output and signal
The logic control of switching.
7. low-power consumption program control type current mutual inductor field detecting device according to claim 1, it is characterised in that: the journey
Control formula mutual-inductor tester (107) includes input signal sampling, signal processing, A/D conversion (301), data analytical calculation and number
Store (302) according to display, the program control type mutual-inductor tester (107) be mainly used to read the error information of tested mutual inductor and
The reading of parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821225207.9U CN208818818U (en) | 2018-07-31 | 2018-07-31 | A kind of low-power consumption program control type current mutual inductor field detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821225207.9U CN208818818U (en) | 2018-07-31 | 2018-07-31 | A kind of low-power consumption program control type current mutual inductor field detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208818818U true CN208818818U (en) | 2019-05-03 |
Family
ID=66272129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821225207.9U Active CN208818818U (en) | 2018-07-31 | 2018-07-31 | A kind of low-power consumption program control type current mutual inductor field detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208818818U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888097A (en) * | 2019-11-13 | 2020-03-17 | 广州供电局有限公司 | Line switching method and device |
| CN111487576A (en) * | 2020-04-30 | 2020-08-04 | 浙江省方正校准有限公司 | Miniature current transformer measuring device based on direct measurement method |
| CN112068062A (en) * | 2020-09-10 | 2020-12-11 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
| CN113447878A (en) * | 2021-06-18 | 2021-09-28 | 中国电力科学研究院有限公司 | Error measuring equipment and method for current transformer |
-
2018
- 2018-07-31 CN CN201821225207.9U patent/CN208818818U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888097A (en) * | 2019-11-13 | 2020-03-17 | 广州供电局有限公司 | Line switching method and device |
| CN111487576A (en) * | 2020-04-30 | 2020-08-04 | 浙江省方正校准有限公司 | Miniature current transformer measuring device based on direct measurement method |
| CN111487576B (en) * | 2020-04-30 | 2022-12-30 | 浙江省计量科学研究院 | Miniature current transformer measuring device based on direct measurement method |
| CN112068062A (en) * | 2020-09-10 | 2020-12-11 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
| CN113447878A (en) * | 2021-06-18 | 2021-09-28 | 中国电力科学研究院有限公司 | Error measuring equipment and method for current transformer |
| CN113447878B (en) * | 2021-06-18 | 2023-12-01 | 中国电力科学研究院有限公司 | Error measurement equipment and method for current transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208818818U (en) | A kind of low-power consumption program control type current mutual inductor field detecting device | |
| CN108761375A (en) | A kind of low-power consumption program control type current mutual inductor field detecting device | |
| Cataliotti et al. | A novel approach to current transformer characterization in the presence of harmonic distortion | |
| CN105223536B (en) | A kind of portable electric meter field calibration system | |
| CN106841767B (en) | A kind of low current signal monitoring system | |
| WO2014114141A1 (en) | Method for detecting residual magnetism of current transformer based on small-signal slope mapping | |
| CN201514473U (en) | Error positioning device of high-voltage electric power metering device | |
| CN106546938A (en) | A kind of anti-DC component of current transformer and test even system | |
| CN103149471A (en) | Calibration method and calibration device for battery charger and charging pile | |
| CN104730485A (en) | GIS type current transformer test method | |
| CN107942192A (en) | A kind of controller switching equipment CT automatic test approach and system | |
| CN103293504A (en) | On-site current transformer comprehensive detector and testing method thereof | |
| CN106483397B (en) | A kind of electric energy quality detection device and measurement method of high-precision high bandwidth | |
| CN109444783A (en) | A kind of one or two fusion device sampling precision test methods of power distribution network | |
| CN209182394U (en) | A kind of non-contact type current signal supervisory instrument | |
| CN103344937B (en) | Intelligent electric energy meter consumption detection equipment and detection method | |
| CN201281729Y (en) | Grounding resistance tester | |
| CN203287514U (en) | Current transformer DC magnetic bias error characteristic measuring device | |
| CN108107313A (en) | The method that unloaded situation judges connection box of electric energy meter correctness | |
| CN105699781B (en) | A kind of transformer leakage inductance and Measuring DC Resistance | |
| CN208172234U (en) | A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig | |
| CN202649455U (en) | Embedded accuracy tester for current transformer | |
| CN202939297U (en) | Verification system for ground resistance tester | |
| CN106526527A (en) | Method for searching minimal inclination angle to determine low-voltage three-phase four-wire wiring | |
| CN104111438B (en) | Primary large-current loop monitoring method in current transformer error test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |