CN105510855B - A kind of low-voltage circuit breaker acting characteristic testing stand calibration method - Google Patents

A kind of low-voltage circuit breaker acting characteristic testing stand calibration method Download PDF

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Publication number
CN105510855B
CN105510855B CN201510887834.3A CN201510887834A CN105510855B CN 105510855 B CN105510855 B CN 105510855B CN 201510887834 A CN201510887834 A CN 201510887834A CN 105510855 B CN105510855 B CN 105510855B
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current
testing stand
mrow
output current
measurement
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CN105510855A (en
Inventor
耿丽恺
孙宁
李洁平
李昕
李颖
国亚磊
穆生乐
李强光
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TIANJIN TIANCHUAN ELECTRONIC CONTROL EQUIPMENT TESTING Co Ltd
Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
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TIANJIN TIANCHUAN ELECTRONIC CONTROL EQUIPMENT TESTING Co Ltd
Electric Power Research Institute of State Grid Tianjin Electric Power Co Ltd
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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
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references

Abstract

The present invention relates to a kind of low-voltage circuit breaker acting characteristic testing stand calibration method, its step is：(1) outward appearance and annex inspection；(2) the inspection of property working properly；(3) the selection of calibration point；(4) waveform distortion measures；(5) DC component content；(6) the coefficient of variation measures；(7) insulation measurement；(8) grounding resistance measurement；(9) temperature measurement.The calibration method applicability of switch action characteristic testing stand provided by the invention is good, there is relatively reasonable and accurate metering system for output current virtual value, current lead-through time measurement, the measuring method of optimization is proposed for insulation measurement, grounding resistance measurement and temperature measurement.

Description

A kind of low-voltage circuit breaker acting characteristic testing stand calibration method
Technical field
The invention belongs to Electrical Testing apparatus field, especially a kind of low-voltage circuit breaker acting characteristic testing stand calibration side Method.
Background technology
Low-voltage circuit breaker switching characteristic testing stand is mainly used in carrying out tripping characteristic experiment to elements such as breakers, passes through liter Stream output high current, tests tripping characteristic the alternating current for providing certain time length.At present, switch action characteristic testing stand can divide For the instantaneous platform of switch action characteristic, the switch action characteristic delay type such as platform and switch action characteristic all-in one desk, testing stand is by controlling The part such as system processed, current source, measuring system, test product clamping device, documenting system forms, and its structure is generally such as specification Shown in accompanying drawing Fig. 1.
The use of low-voltage circuit breaker switching characteristic testing stand is calibrated than wide and lacks certain specification and operation standard Change, unitized step, to during actual alignment operator cause very big obstacle, not only have impact on operating efficiency, It is big to also result in the poor error of many testing stands, or even causes the damage of testing stand.It would therefore be highly desirable to it is exactly to seek one to solve the problems, such as Low-voltage circuit breaker acting characteristic testing stand calibration method of the kind with preferable applicability.
The content of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, there is provided one kind is applied to coming of new, newly purchases, makes With the instantaneous platform of switch action characteristic, switch action characteristic delay platform, switch action characteristic all-in one desk neutralized after repairing, it is also suitable In the low-voltage circuit breaker acting characteristic testing stand calibration method of AC great current constant-current source.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of low-voltage circuit breaker acting characteristic testing stand calibration method, its step are：
(1) outward appearance and annex inspection；
(2) the inspection of property working properly；
(3) the selection of calibration point:
1. 70%, 80%, 90%, the 100% of selection basic range is calibrated as test point,
2. to non-basic range, choose 100% range point and calibrated；
(4) waveform distortion measures:To delay test board, the waveform distortion under maximum output current is measured.Measurement side Method is：After the output of testing stand electric current is stable, the waveform and the distortion factor of output current are measured, 5 groups of numerical value is measured, takes in 5 groups of data Data maximums, it is desirable to which maximum is within 5%；
(5) DC component content：Measurement gives a prospective short circuit current, acquisition time to instant test platform by testing stand For 0.2s, the DC component content of first output waveform of measurement.Measure equation is as follows：
In formula：%dc-DC component content
POn- upward peak
PUnder- lower peak value
(6) the coefficient of variation measures：
According to the fan-out capability of testing stand, minimum and maximum output current of the measuring test-bed under rated output is distinguished Stability, measuring method are：The current effective value of a testing stand is measured per 30s, measurement period 10min, is obtained 20 Data, x is designated as respectively1~x20, seek s2And CV.
In formula：- average
s2- variance
S-standard deviation
CV-the coefficient of variation
Try to achieve the coefficient of variation CV ＜ 80% under minimum and maximum electric current.
(7) insulation measurement:
The insulaion resistance between every circuit and exposed conductive component, between circuit and ground is measured, the resistance >=500k Ω；
(8) grounding resistance measurement:
Measure the grounding resistance between each exposed conductive part and ground, the Ω of the resistance≤0.1；
(9) temperature measurement:
1. the testing stand for carrying out delay test, the delaying current indicated according to manufacturer in specification in admittance and After the admittance time, busbar and any contact of galvanic circle that its test electric current is flowed through,
2. for the testing stand of wink dynamic test, the transient current indicated in admittance according to manufacturer in specification and The admittance of 200ms times, and the time interval tested twice is not less than the License Value that manufacturer provides, it is tested electric current and flowed through Busbar and galvanic circle any contact.
Moreover, also include the method for measurement output current virtual value in testing procedure, it is defeated to testing stand according to current divider method Go out current effective value to measure, concretely comprise the following steps：
Current divider seals in testing stand electric current output loop, current divider output termination oscillograph, sets output current, works as electric current By when, adjust oscillograph time scale and triggering set, obtain the voltage change waveform at current divider both ends.Determined according to ohm I=U/R is restrained, draws the output current virtual value of testing stand,
Output current virtual value relative error is represented with following formula：
In above formula：γIThe relative error of-output current virtual value
I-testing stand display output current effective value
U-oscillograph measures voltage effective value
R-current divider resistance value.
Moreover, also including the method for measurement current lead-through time accuracy in testing procedure, according to above-mentioned current divider method, show The voltage waveform for being carried in output end on current divider is intuitively shown on ripple device, when being continued with oscillograph cursor function read current Between, the error of output current ON time is represented with following formula：
γT=T-T1
In formula：γTThe error of-output current ON time
T-testing stand display output current lead-through time
T1- measured test platform output current ON time.
The advantages and positive effects of the present invention are：
Low-voltage circuit breaker acting characteristic testing stand calibration method applicability provided by the invention is good, effective for output current Value, current lead-through time measurement have relatively reasonable and accurate metering system, for insulation measurement, grounding resistance measurement And temperature measurement proposes the measuring method of optimization.
Brief description of the drawings
Fig. 1 is the wiring construction block diagram of switch action characteristic testing stand；
Fig. 2 is to measure output current virtual value using current divider method and measure the wiring construction of current lead-through time accuracy Block diagram,
Fig. 3 is to measure output current virtual value using current sensor method and measure the wiring of current lead-through time accuracy Structured flowchart.
Embodiment
Below in conjunction with the accompanying drawings and the invention will be further described by specific embodiment, and following examples are descriptive , it is not limited, it is impossible to which protection scope of the present invention is limited with this.
A kind of low-voltage circuit breaker acting characteristic testing stand calibration method, is shown in Fig. 1, and its step is：
(1) outward appearance and annex inspection；
(2) the inspection of property working properly；
(3) the selection of calibration point:
1. 70%, 80%, 90%, the 100% of selection basic range is calibrated as test point,
2. to non-basic range, choose 100% range point and calibrated；
(4) waveform distortion measures:To delay test board, the waveform distortion under maximum output current is measured.Measurement side Method is：After the output of testing stand electric current is stable, the waveform and the distortion factor of output current are measured, 5 groups of numerical value is measured, takes in 5 groups of data Data maximums, it is desirable to which maximum is within 5%；
(5) DC component content：Measurement gives a prospective short circuit current, acquisition time to instant test platform by testing stand For 0.2s, the DC component content of first output waveform of measurement.Measure equation is as follows：
In formula：%dc-DC component content
POn- upward peak
PUnder- lower peak value
(6) the coefficient of variation measures：
According to the fan-out capability of testing stand, minimum and maximum output current of the measuring test-bed under rated output is distinguished Stability, measuring method are：The current effective value of a testing stand is measured per 30s, measurement period 10min, is obtained 20 Data, x is designated as respectively1~x20, seek s2And CV.
In formula：- average
s2- variance
S-standard deviation
CV-the coefficient of variation
Try to achieve the coefficient of variation CV ＜ 80% under minimum and maximum electric current.
(7) insulation measurement:
The insulaion resistance between every circuit and exposed conductive component, between circuit and ground is measured, the resistance >=500k Ω；
(8) grounding resistance measurement:
Measure the grounding resistance between each exposed conductive part and ground, the Ω of the resistance≤0.1；
(9) temperature measurement:
1. the testing stand for carrying out delay test, the delaying current indicated according to manufacturer in specification in admittance and After the admittance time, busbar and any contact of galvanic circle that its test electric current is flowed through,
2. for the testing stand of wink dynamic test, the transient current indicated in admittance according to manufacturer in specification and The admittance of 200ms times, and the time interval tested twice is not less than the License Value that manufacturer provides, it is tested electric current and flowed through Busbar and galvanic circle any contact.
Also include the method for measurement output current virtual value in testing procedure:
See Fig. 2, testing stand output current virtual value is measured according to current divider method, concretely comprised the following steps：
Current divider seals in testing stand electric current output loop, current divider output termination oscillograph, sets output current, works as electric current By when, adjust oscillograph time scale and triggering set, obtain the voltage change waveform at current divider both ends.Determined according to ohm I=U/R is restrained, draws the output current virtual value of testing stand,
Output current virtual value relative error is represented with following formula：
In above formula：γIThe relative error of-output current virtual value
I-testing stand display output current effective value
U-oscillograph measures voltage effective value
R-current divider resistance value.
Also include the method for measurement current lead-through time accuracy in testing procedure, according to above-mentioned current divider method, oscillograph On intuitively show the voltage waveform for being carried in output end on current divider, with the oscillograph cursor function read current duration, The error of output current ON time is represented with following formula：
γT=T-T1
In formula：γTThe error of-output current ON time
T-testing stand display output current lead-through time
T1- measured test platform output current ON time.
In test measurement output current virtual value and measurement current lead-through time accuracy, except using current divider method Outside, current sensor method can also be used, sees Fig. 3, wherein according to current sensor method measuring test-bed output current virtual value, Concretely comprise the following steps：
Current sensor seals in testing stand electric current output loop, current transducer output termination oscillograph, setting output electricity Stream, when an electric current passes through it, current sensor converts the current to voltage, curent change curve is obtained on oscillograph, according to electricity Calculation formula U=K × I of flow sensor, under showing that testing stand output current virtual value, output current virtual value relative error are used Formula represents：
In above formula：γIThe relative error of-output current virtual value
I-testing stand display output current effective value
U-oscillograph measures voltage effective value
K-current sensor no-load voltage ratio, unit mV/A.
Data processing
The data of the maximum elementary error and actual value of testing stand will be calculated first, the rear revision of the convention.Judge whether testing stand accords with Technical requirement is closed, should be using the data after the revision of the convention as foundation.
The number of significant digit of calibration data is provided, typically than by more one required by the accuracy grade of school testing stand.
The data revision of the convention is according to the even number rule that rounds up.
Testing stand calibration cycle is recommended 1 year, if testing stand places under repair, should be calibrated immediately after repairing.
Although disclosing embodiments of the invention and accompanying drawing for the purpose of illustration, those skilled in the art can manage Solution：Do not departing from the present invention and spirit and scope of the appended claims in, it is various replace, change and modifications all be it is possible, Therefore, the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.

Claims (3)

  1. A kind of 1. low-voltage circuit breaker acting characteristic testing stand calibration method, it is characterised in that：Its step is：
    (1) outward appearance and annex inspection；
    (2) the inspection of property working properly；
    (3) the selection of calibration point:
    1. 70%, 80%, 90%, the 100% of selection basic range is calibrated as test point,
    2. to non-basic range, choose 100% range point and calibrated；
    (4) waveform distortion measures:To delay test board, the waveform distortion under maximum output current, measuring method are measured For：After the output of testing stand electric current is stable, the waveform and the distortion factor of output current are measured, measures 5 groups of numerical value, take number in 5 groups of data According to maximum, it is desirable to which maximum is within 5%；
    (5) DC component content：Measurement gives a prospective short circuit current, acquisition time is to instant test platform by testing stand 0.2s, measures the DC component content of first output waveform, and measure equation is as follows：
    In formula：%dc-DC component content
    POn- upward peak
    PUnder- lower peak value
    (6) the coefficient of variation measures：
    According to the stabilization of the fan-out capability of testing stand, respectively minimum and maximum output current of the measuring test-bed under rated output Degree, measuring method are：The current effective value of a testing stand is measured per 30s, measurement period 10min, 20 data are obtained, X is designated as respectively1~x20, seek s2And CV,
    <mrow> <msup> <mi>s</mi> <mn>2</mn> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mn>20</mn> </mfrac> <mo>&amp;lsqb;</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>1</mn> </msub> <mo>-</mo> <mover> <mi>x</mi> <mo>&amp;OverBar;</mo> </mover> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>2</mn> </msub> <mo>-</mo> <mover> <mi>x</mi> <mo>&amp;OverBar;</mo> </mover> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>20</mn> </msub> <mo>-</mo> <mover> <mi>x</mi> <mo>&amp;OverBar;</mo> </mover> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>&amp;rsqb;</mo> </mrow>
    <mrow> <mi>C</mi> <mo>&amp;CenterDot;</mo> <mi>V</mi> <mo>=</mo> <mfrac> <mi>s</mi> <mover> <mi>x</mi> <mo>&amp;OverBar;</mo> </mover> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> <mi>%</mi> </mrow>
    In formula：- average
    s2- variance
    S-standard deviation
    CV-the coefficient of variation
    Try to achieve the coefficient of variation CV ＜ 80% under minimum and maximum electric current；
    (7) insulation measurement:
    The insulaion resistance between every circuit and exposed conductive component, between circuit and ground is measured, the resistance >=500k Ω；
    (8) grounding resistance measurement:
    Measure the grounding resistance between each exposed conductive part and ground, the Ω of the resistance≤0.1；
    (9) temperature measurement:
    1. the testing stand for carrying out delay test, the delaying current and admittance indicated according to manufacturer in specification in admittance After time, busbar and any contact of galvanic circle that its test electric current is flowed through,
    2. for the testing stand of wink dynamic test, in admittance according to manufacturer in the transient current and 200ms that specification is indicated Between admittance, and the time interval tested twice is not less than the License Value that manufacturer provides, and it tests the busbar that is flowed through of electric current With any contact of galvanic circle.
  2. 2. low-voltage circuit breaker acting characteristic testing stand calibration method according to claim 1, it is characterised in that：The test Also include the method for measurement output current virtual value in step, testing stand output current virtual value is surveyed according to current divider method Amount, is concretely comprised the following steps：
    Current divider seals in testing stand electric current output loop, current divider output termination oscillograph, output current is set, when electric current passes through When, the time scale and triggering that adjust oscillograph are set, and the voltage change waveform at current divider both ends are obtained, according to Ohm's law I =U/R, the output current virtual value of testing stand is drawn,
    Output current virtual value relative error is represented with following formula：
    <mrow> <msub> <mi>&amp;gamma;</mi> <mi>I</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mi>I</mi> <mo>-</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> </mrow> <msub> <mi>I</mi> <mn>1</mn> </msub> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> <mi>%</mi> <mo>=</mo> <mfrac> <mrow> <mi>I</mi> <mo>-</mo> <mi>U</mi> <mo>/</mo> <mi>R</mi> </mrow> <mrow> <mi>U</mi> <mo>/</mo> <mi>R</mi> </mrow> </mfrac> <mo>&amp;times;</mo> <mn>100</mn> <mi>%</mi> </mrow>
    In above formula：γIThe relative error of-output current virtual value
    I-testing stand display output current effective value
    U-oscillograph measures voltage effective value
    R-current divider resistance value.
  3. 3. low-voltage circuit breaker acting characteristic testing stand calibration method according to claim 2, it is characterised in that：The test Also include the method for measurement current lead-through time accuracy in step, according to above-mentioned current divider method, intuitively shown on oscillograph The voltage waveform of output end on current divider is carried in, with oscillograph cursor function read current duration, output current conducting The error of time is represented with following formula：
    γT=T-T1
    In formula：γTThe error of-output current ON time
    T-testing stand display output current lead-through time
    T1- measured test platform output current ON time.
CN201510887834.3A 2015-12-04 2015-12-04 A kind of low-voltage circuit breaker acting characteristic testing stand calibration method Active CN105510855B (en)

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CN107764433A (en) * 2016-08-23 2018-03-06 哈尔滨飞机工业集团有限责任公司 A kind of Inter-Turbine Temperature watch test device
CN106772025A (en) * 2016-11-30 2017-05-31 国家电网公司 A kind of breaking capacity of breaker appraisal procedure based on total current equivalence principle
CN109490735A (en) * 2018-10-12 2019-03-19 上海谱幂精密仪器科技有限公司 It is a kind of for measuring the device and method of electric current and/or voltage

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CN104076312A (en) * 2014-06-25 2014-10-01 中国电子科技集团公司第十三研究所 Semiconductor characteristic analyzer high-value voltage precise calibration method
CN104297710A (en) * 2014-09-26 2015-01-21 天津电气科学研究院有限公司 High-current sensor calibration method based on curve fitting method
CN104656048A (en) * 2014-09-26 2015-05-27 天津电气科学研究院有限公司 Calibrating method of switch motion characteristic test bed

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Publication number Priority date Publication date Assignee Title
CN104656014A (en) * 2014-09-26 2015-05-27 天津电气科学研究院有限公司 Switch operating characteristic testbed calibrating method based on current sensor method

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Publication number Priority date Publication date Assignee Title
CN104076312A (en) * 2014-06-25 2014-10-01 中国电子科技集团公司第十三研究所 Semiconductor characteristic analyzer high-value voltage precise calibration method
CN104297710A (en) * 2014-09-26 2015-01-21 天津电气科学研究院有限公司 High-current sensor calibration method based on curve fitting method
CN104656048A (en) * 2014-09-26 2015-05-27 天津电气科学研究院有限公司 Calibrating method of switch motion characteristic test bed

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