CN104267364A - Method for calibrating large-current sensor - Google Patents
Method for calibrating large-current sensor Download PDFInfo
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- CN104267364A CN104267364A CN201410503137.9A CN201410503137A CN104267364A CN 104267364 A CN104267364 A CN 104267364A CN 201410503137 A CN201410503137 A CN 201410503137A CN 104267364 A CN104267364 A CN 104267364A
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Abstract
The invention relates to a method for calibrating a large-current sensor. The method includes the steps that firstly, appearance inspection is conducted; secondly, electrified checking is conducted; thirdly, a withstand voltage test is conducted; fourthly, insulation resistance checking is conducted; fifthly, calibration point selection is conducted; sixthly, basic error measurement is conducted; seventhly, relative error measurement is conducted. The method for calibrating the large-current sensor is good in applicability, measuring and calibrating can be conducted by adopting a large-current source method or a standard small resistance method specific to relative errors, and the two methods both have the high measuring and calibrating precision.
Description
Technical field
The invention belongs to Electrical Testing apparatus field, especially a kind of calibration steps of great current sensor.
Background technology
Great current sensor, converts the device of small voltage output to, such as Luo-coil, current comparator, Hall mutual inductor etc., thus achieves the real-time measurement of big current according to certain ratio by big current.
The use of great current sensor is more extensive, but calibration lacks certain specification and operational standardization, unitized step, very large obstacle is caused to operator in actual alignment process, not only have impact on work efficiency, also cause the poor error of a lot of testing table large, even cause the damage of testing table.Therefore, problem demanding prompt solution is exactly seek a kind of calibration steps with the great current sensor of better applicability.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide a kind of relative error little and the calibration steps of the great current sensor that applicability is good.
The present invention solves its technical matters and takes following technical scheme to realize:
A calibration steps for great current sensor, the steps include:
(1) visual examination;
(2) be energized inspection;
(3) withstand voltage test;
(4) insulation resistance inspection;
(5) the choosing of calibration point:
The principle choosing the calibration point of sensor is that lower limit to the upper limit is chosen uniformly and is no less than 5 calibration points, choose 10% of range respectively, 30%, 50%, 80%, 100% place.
(6) fundamental error is measured:
1. 2h is no less than under being placed in calibration environment condition by school sensor;
When 2. measuring except electrified wire, other all current－carrying conductors and should 0.5m be greater than by the distance between the sensor of school;
3. the horizontal vertical geometric center position of current lead should be placed in by school sensor;
4., after numerical stability 5s, reading is carried out to each calibration point;
(7) relative error is measured:
The relative error of great current sensor conversion proportion is measured and adopts big current source method.
And in the method for described big current source, the relative error computing formula of great current sensor conversion proportion is:
In above formula: the relative error of γ-output conversion proportion
V
1-standard multimeter displayed value
I
1-normalized current source displayed value
K
1the measured value of-conversion proportion coefficient, unit mV/A
K
0the nominal value of-great current sensor conversion proportion, unit mV/A.
Advantage of the present invention and good effect are:
The calibration steps applicability of great current sensor provided by the invention is good, and big current source can be adopted to carry out measuring and calibrating for relative error, two kinds of methods all have higher measurement and calibration accuracy.
Accompanying drawing explanation
Fig. 1 is the wiring construction schematic diagram measuring great current sensor relative error in the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by specific embodiment, the invention will be further described, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A calibration steps for great current sensor, the steps include:
(1) visual examination
The great current sensor be calibrated, should be furnished with instructions and corresponding data; Work certificate book and whole indispensable annex should be had.The contour structures of great current sensor should be intact.Switch, button, button etc., flexible operation is reliable, mark clear and definite, exposes part and does not have and loosen and mechanical damage.Its nameplate or shell should indicate its title, model, numbering, the date of production and manufacturer.The mark of power supply and voltage and frequency range instruction clear and definite.
(2) be energized inspection
After visual examination, to be energized preheating to standard device by operation instructions.
(3) withstand voltage test
Trial voltage is raised to setting (voltage setting please refer to the instructions of product) reposefully from zero, keeps 1min, with same speed, trial voltage is dropped to zero subsequently, insulate in test and should not occur punch-through.
(4) insulation resistance inspection
By the insulation resistance at the two ends of sensor loop junction, school under calibration environment, the insulation resistance meter of available 500V measures its insulation resistance.
(5) the choosing of calibration point
The principle choosing the calibration point of sensor is that lower limit to the upper limit is chosen uniformly and is no less than 5 calibration points, choose 10% of range respectively, 30%, 50%, 80%, 100% place.
(6) fundamental error is measured
A) 2h is no less than under being placed in calibration environment condition by school sensor;
When b) measuring except electrified wire, other all current－carrying conductors and should 0.5m be greater than by the distance between the sensor of school;
C) the horizontal vertical geometric center position of current lead should be placed in by school sensor;
D) after numerical stability 5s, reading is carried out to each calibration point;
(7) relative error is measured
The relative error of great current sensor conversion proportion is measured and adopts big current source method:
As shown in Figure 1, the relative error computing formula of great current sensor conversion proportion is the method wiring of big current source:
In above formula: the relative error of γ-output conversion proportion
V
1-standard multimeter displayed value
I
1-normalized current source displayed value
K
1the measured value of-conversion proportion coefficient, unit mV/A
K
0the nominal value of-great current sensor conversion proportion, unit mV/A
Data processing
The calibration data of standard should charge to calibration raw readings.The maximum fundamental error of great current sensor and the data of actual value all will first calculate, the rear revision of the convention.Figure place after calculating should than the many reservation one of figure place before calculating, and data recondition enters even number rule according to four houses six.
Great current sensor calibration cycle recommends 1 year.
Embodiment 1
Examined product information
Device name: loop current tester
Model specification: i3000s
Factory number: 95310102
Production unit: FLUKE
The calibration date: on June 26th, 2014
Output current scope: 0-3000A, this time example is selected to measure 100A as calibration point
Output current accuracy: ± 5%
No-load voltage ratio: according to selection of measuring point, selects 10mV/A when 100A
No-load voltage ratio accuracy: ± 1%
(1) outward appearance and annex inspection
The contour structures of great current sensor should be intact.Switch, button, button etc., flexible operation is reliable, and mark clear and definite, exposes part non-loosening and mechanical damage.Its nameplate or shell should indicate its title, model, numbering, the date of production and manufacturer.The mark of power supply and voltage and frequency range instruction clear and definite.
(2) be energized inspection
Great current sensor is 22 DEG C in temperature, under humidity is the environmental baseline of 60%RH, places more than 24 hours.
After visual examination, to be energized preheating to standard device by operation instructions.
(3) withstand voltage test
Adopt measurement instrument: Hi-pot Tester MS2670F
Manufacturer: Nanjing Minsheng Electronic Instruments Co., Ltd.
Measuring method: trial voltage is raised to setting (voltage setting please refer to the instructions of product) stably from zero, keeps 1min, with same speed, trial voltage is dropped to zero subsequently.
Measurement result: insulate in test and should not occur punch-through
(4) insulation measurement
Adopt measurement instrument: insulation resistance meter ZV25-3
Manufacturer: Jinchuan, Nanjing ammeter Manufacturing Co., Ltd
Measuring method: the insulation resistance between metering circuit and exposed conductive component, between circuit and ground
Measurement result: voltage is 500V, and insulation resistance is 100M Ω, meets the requirements
(5) the measurement of fundamental error
Adopt reference instrument information
A, normalized current voltage source
Device name: multi-functional prover
Unit type: 5720A
Production unit: Fluke
The maximum output valve of electric current: 2.2A (easily extensible is to 120A)
Electric current uncertainty: ± 140ppm
The maximum output valve of voltage: 1100V
Voltage uncertainty: ± 45ppm
B, standard digital multimeter
Title: digital multimeter
Model: 8508A
Production unit: Fluke
Current measuring range: 0 ~ 20A
Current measurement uncertainty: ± (250ppm exports+100ppm range)
Voltage measurement scope: 0 ~ 1050V
Voltage measurement uncertainty: ± (65ppm exports+10ppm range)
(6) relative error is measured
Measuring method:
Measure according to the relative error of big current source method wiring (shown in Fig. 1) pair of connecting wires great current sensor conversion proportion, the relative error computing formula of great current sensor conversion proportion is:
In above formula: the relative error of γ-output conversion proportion
V
1-standard multimeter displayed value
I
1-normalized current source displayed value
K
1the measured value of-conversion proportion coefficient, unit mV/A
K
0the nominal value of-great current sensor conversion proportion, unit mV/A.
Great current sensor is enclosed within big current source output terminal loop, selects 10mV/A shelves, regulate big current source to export the AC signal of 100A, and connect one piece of digital multimeter show its conversion after voltage signal.
Measurement result
Big current source output current value: 100A
Digital multimeter records magnitude of voltage: 0.999981V
The no-load voltage ratio of loop current tester display: 10mV/A
So, the no-load voltage ratio that loop current tester is measured: 0.999981V/100A=9.99981mV/A.
Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration, but it will be appreciated by those skilled in the art that: in the spirit and scope not departing from the present invention and claims, various replacement, change and amendment are all possible, therefore, scope of the present invention is not limited to the content disclosed in embodiment and accompanying drawing.
Claims (2)
1. a calibration steps for great current sensor, is characterized in that: the steps include:
(1) visual examination;
(2) be energized inspection;
(3) withstand voltage test;
(4) insulation resistance inspection;
(5) the choosing of calibration point:
The principle choosing the calibration point of sensor is that lower limit to the upper limit is chosen uniformly and is no less than 5 calibration points, choose 10% of range respectively, 30%, 50%, 80%, 100% place.
(6) fundamental error is measured:
1. 2h is no less than under being placed in calibration environment condition by school sensor;
When 2. measuring except electrified wire, other all current－carrying conductors and should 0.5m be greater than by the distance between the sensor of school;
3. the horizontal vertical geometric center position of current lead should be placed in by school sensor;
4., after numerical stability 5s, reading is carried out to each calibration point;
(7) relative error is measured:
The relative error of great current sensor conversion proportion is measured and adopts big current source method.
2. the calibration steps of great current sensor according to claim 1, is characterized in that: in the method for described big current source, the relative error computing formula of great current sensor conversion proportion is:
In above formula: the relative error of γ-output conversion proportion
V
1-standard multimeter displayed value
I
1-normalized current source displayed value
K
1the measured value of-conversion proportion coefficient, unit mV/A
K
0the nominal value of-great current sensor conversion proportion, unit mV/A.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669152A (en) * | 2018-11-21 | 2019-04-23 | 西安航天计量测试研究所 | A kind of current parameters calibration system and method |
| CN111289929A (en) * | 2020-03-13 | 2020-06-16 | 深圳天溯计量检测股份有限公司 | Calibration method of alternating current resistance tester |
| CN111289930A (en) * | 2020-03-13 | 2020-06-16 | 深圳天溯计量检测股份有限公司 | Calibration method of inductance tester |
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2014
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| CN101556320A (en) * | 2009-04-30 | 2009-10-14 | 厦门红相电力设备股份有限公司 | On-site calibrating method and device of capacitor voltage transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669152A (en) * | 2018-11-21 | 2019-04-23 | 西安航天计量测试研究所 | A kind of current parameters calibration system and method |
| CN111289929A (en) * | 2020-03-13 | 2020-06-16 | 深圳天溯计量检测股份有限公司 | Calibration method of alternating current resistance tester |
| CN111289930A (en) * | 2020-03-13 | 2020-06-16 | 深圳天溯计量检测股份有限公司 | Calibration method of inductance tester |
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Application publication date: 20150107 |