CN104656048B - A kind of calibration method of switch action characteristic testing stand - Google Patents
A kind of calibration method of switch action characteristic testing stand Download PDFInfo
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Abstract
The present invention relates to a kind of calibration method of switch action characteristic testing stand, step is：(1) appearance and attachment inspection；(2) the inspection of property working properly；(3) the selection of calibration point；(4) output current virtual value is measured；(5) current lead-through time accuracy is measured；(6) insulation measurement；(7) ground resistance measures；(8) temperature measurement.The calibration method applicability of switch action characteristic testing stand provided by the invention is good, it is measured with relatively reasonable and accurate measurement method for output current virtual value, current lead-through time, the measurement method of optimization is proposed for insulation measurement, ground resistance measurement and temperature measurement.
Description
Technical field
The invention belongs to electrical testing apparatus field, especially a kind of calibration method of switch action characteristic testing stand.
Background technology
Switching characteristic testing stand is mainly used for carrying out tripping characteristic experiment to elements such as breakers, and big electricity is exported by flowing up
Stream tests tripping characteristic the alternating current for providing certain time length.Currently, switch action characteristic testing stand can be divided into switch motion
The instantaneous platform of characteristic, the switch action characteristic delay types such as platform and switch action characteristic all-in one desk, testing stand is by control system, electric current
The part such as source, measuring system, test product clamping device, documenting system forms, and structure is usually such as Figure of description Fig. 1 institutes
Show.
The use of switching characteristic testing stand calibrates than wide and lacks certain specification and operational standardization, unitizes
The step of, to during actual alignment operator cause prodigious obstacle, not only affect working efficiency, also result in very much
The poor error of testing stand is big, or even causes the damage of testing stand.It would therefore be highly desirable to which it is exactly to seek one kind to have preferably to solve the problems, such as
The calibration method of the switch action characteristic testing stand of applicability.
Invention content
It is an object of the invention to overcome the deficiencies in the prior art places, provide one kind and being suitable for coming of new, newly purchase, make
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 calibration method of the switch action characteristic testing stand of AC great current constant-current source.
The present invention solves its technical problem and following technical scheme is taken to realize：
A kind of calibration method of switch action characteristic testing stand, step are：
(1) appearance and attachment inspection；
(2) the inspection of property working properly；
(3) the selection of calibration point:
1. the 70% of basic range, 80%, 90%, 100% should be selected to be calibrated as test point,
2. to non-basic range, chooses 100% range point and calibrated；
(4) output current virtual value is measured:
Testing stand output current virtual value is measured according to current divider method；
(5) current lead-through time accuracy is measured:
According to above-mentioned current divider method, the voltage waveform of load output end on current divider is intuitively shown on oscillograph, is used
Oscillograph cursor function read current duration, the error of output current turn-on time are indicated with following formula：
γT=T-T1
In formula：γTThe error of-output current turn-on time
T-testing stand shows output current turn-on time
T1- measured test platform output current turn-on time；
(6) insulation measurement:
The insulation resistance between every circuit and exposed conductive component, between circuit and ground is measured, the resistance >=500k Ω；
(7) ground resistance measures:
The ground resistance between each exposed conductive part and ground is measured, the Ω of the resistance≤0.1；
(8) temperature measurement:
1. for carrying out the testing stand of delay test, the delaying current indicated in specification according to manufacturer in admittance and
After the admittance time, any contact of busbar and galvanic circle that test electric current is flowed through,
2. for the testing stand of wink dynamic test, the transient current indicated in specification according to manufacturer in admittance and
The admittance of 200ms times, and the time interval tested is less than 3 minutes, the busbar that is flowed through of test electric current and galvanic circle
Any contact.
Moreover, the current divider method measuring test-bed output current virtual value, the specific steps are：
Current divider seals in testing stand electric current output loop, and current divider output termination oscillograph sets output current, works as electric current
By when, adjust oscillograph time scale and triggering setting, obtain the voltage change waveform at current divider both ends.It is fixed according to ohm
I=U/R is restrained, obtains the output current virtual value of testing stand,
Output current virtual value relative error is indicated with following formula：
In above formula：γIThe relative error of-output current virtual value
I-testing stand shows output current virtual value
U-oscillograph measures voltage effective value
R-current divider resistance value.
The advantages and positive effects of the present invention are：
The calibration method applicability of switch action characteristic testing stand provided by the invention is good, for output current virtual value,
The current lead-through time measure have relatively reasonable and accurate measurement method, for insulation measurement, ground resistance measurement with
And temperature measurement proposes the measurement method of optimization.
Description of the drawings
Fig. 1 is the wiring construction block diagram of switch action characteristic testing stand in the present invention；
Fig. 2 is to measure output current virtual value using current divider method in the present invention and measure current lead-through time accuracy
Wiring construction block diagram.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings and by specific embodiment, and following embodiment is descriptive
, it is not restrictive, protection scope of the present invention cannot be limited with this.
A kind of calibration method of switch action characteristic testing stand, step are：
(1) appearance and attachment inspection
Intact, work(is answered with the contour structures of the appearance and attachment of visual method checkout facility platform, switch action characteristic testing stand
Letter symbol, mark, figure, number and the physical quantity code name etc. of energy should meet corresponding standard, and answer clear, proper.Experiment
Platform shape should not have an impact the damage of meter characteristic.Metalwork should not have corrosion and other mechanical damages.It opens at each position of testing stand
It closes, button operation answers flexibility and reliability.The necessary good seal of metal (or plastics) encapsulation of testing stand, lead connector must reach over to
Well.
(2) the inspection of property working properly
A. it is placed more than for 24 hours under conditions of testing stand should be provided at 5.1.
B. testing stand is powered after preheating, and the function of each switch and each function key should be normal.
(3) the selection of calibration point
A. 70%, 80%, 90%, the 100% of basic range should be selected to be calibrated as test point.
B. it to non-basic range, chooses 100% range point and is calibrated.
(4) output current virtual value is measured
To be tested wiring is as shown in Figure 1, measure testing stand output current virtual value according to current divider method.
Current divider method
Measuring test-bed output current virtual value, the specific steps are：
Current divider seals in testing stand electric current output loop, and current divider output termination oscillograph is shown in Fig. 2.
Output current is set, when an electric current passes through it, time scale and the triggering setting of oscillograph is adjusted, obtains current divider two
The voltage change waveform at end.According to Ohm's law I=U/R, the output current virtual value of testing stand is obtained.
Output current virtual value relative error is indicated with following formula：
In above formula：γIThe relative error of-output current virtual value
I-testing stand shows output current virtual value
U-oscillograph measures voltage effective value
R-current divider resistance value
(5) current lead-through time accuracy is measured
According to above-mentioned current divider method, wiring is as shown in Fig. 2, intuitively show load output end on current divider on oscillograph
Voltage waveform.With the oscillograph cursor function read current duration.
The error of output current turn-on time is indicated with following formula：
γT=T-T1
In formula：γTThe error of-output current turn-on time
T-testing stand shows output current turn-on time
T1- measured test platform output current turn-on time
(6) insulation measurement
The insulation resistance between every circuit and exposed conductive component, between circuit and ground is measured, 500k Ω are at least should be.
(7) ground resistance measures
The ground resistance between each exposed conductive part and ground is measured, 0.1 Ω is not to be exceeded.
(8) temperature measurement
A. for carrying out the testing stand of delay test, the delaying current indicated in specification according to manufacturer in admittance and
After the admittance time, any contact of busbar and galvanic circle that test electric current is flowed through, Wen Sheng must not exceed 4.5 regulations
Value.
B. for the testing stand of wink dynamic test, the transient current indicated in specification according to manufacturer in admittance and
The admittance of 200ms times, and the time interval tested is less than 3 minutes, is carried out continuously 50 times, the busbar that test electric current is flowed through
With any contact of galvanic circle, Wen Sheng must not exceed 4.5 defined values.
Data processing
The maximum elementary error of testing stand and the data of actual value will be calculated first, the rear revision of the convention.Judge whether testing stand accords with
Technical requirement is closed, it should be using the data after the revision of the convention as foundation.
The number of significant digit of calibration data is provided, generally 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.
Embodiment 1
Examined product information
Device name：Snap action characteristic test-bed
Model specification：SB-63、100/225
Factory number：197
Production unit：Leqing pioneer's automation equipment Co., Ltd
Calibrate the date：On March 4th, 2014
Output current scope：0-1000A, this example select to measure 900A as calibration point
Output current accuracy：± 5%
Current lead-through time accuracy：±1ms
Its calibration steps is：
(1) appearance and attachment inspection
Testboard appearance and attachment are visually inspected, testboard contour structures are intact, and letter symbol, mark of function etc. meet
Corresponding standard, and it is clear, proper.Metalwork non-corroding and other mechanical damages.Each position switch of testboard, button operation
Flexibility and reliability.
(2) property inspection working properly
Testboard is placed 24 hours or more under the environmental condition that temperature is 22 DEG C, humidity is 50%RH.
Testboard is powered after preheating, and each switch and function key are normal.
(3) output current virtual value, current lead-through time accuracy measure
Using standard instrument information
A, oscillograph
Device name：Electrographic recording instrument
Unit type：DL750
Production unit：YOKGAWA
Vertical component maximum inputs：850V
Vertical component accuracy：± 0.25%
Time shaft measurement range：500ns/div-3day/div
Time shaft accuracy of measurement：± 0.005%
B, noninductive current divider
Title：Noninductive current divider
Model：FLTT1-2V
Production unit：Pujiangainadisi Instrument Co., Ltd., Shanghai
Measurement range：100kA
Accuracy of measurement：± 1.5%
Resistance value：16.96uΩ
Measurement method
It is measured according to current divider method, output current 900A is arranged in testboard, and current divider is connected on testboard output end and returns
On the road.Electrographic recording instrument field amplitude component is set as 2mV/div, and time axis component is set as 5ms/div, and opens triggering work(
Energy.
Measurement result
A, output current virtual value
Testboard shows output current value：900A
Electrographic recording instrument measures voltage value：15.56mV
Current divider resistance value：16.96uΩ
So testboard actual output current value：917.4A
B, the current lead-through time measures
Testboard shows the current lead-through time：25ms
Electrographic recording instrument measures the current lead-through time：25.3ms
(4) insulation measurement
Using measuring instrumentss：Insulation resistance meter ZV25-3
Manufacturer：Nanjing Jinchuan ammeter Manufacturing Co., Ltd
Measurement method：Insulation resistance between measuring circuit and exposed conductive component, between circuit and ground
Measurement result：Voltage is 500V, and insulation resistance is 100M Ω, is met the requirements
(5) ground resistance measures
Using measuring instrument：Automatic intelligent earth-continuity measuring instrument AN9611M
Manufacturer：Qingdao Ai Nuo instrument companies
Measurement method：Measure the ground resistance between each exposed conductive part and ground
Measurement result：30m Ω, meet the requirements
(6) temperature measurement
Using measuring instrument：Recording instrument without paper XMR7040QC
Manufacturer：Fuzhou Fuguang Baite Automatical Equipment Co., Ltd.
Measurement method：Any node for the busbar and galvanic circle that test electric current is flowed through, conductor naked copper tie point
Measurement result：The Wen Shengjun of any node for the busbar and galvanic circle that test electric current is flowed through is less than 95 DEG C,
Conductor naked copper tie point temperature rises 35 DEG C, meets the requirements.
Although disclosing the embodiment of the present invention and attached 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, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to embodiment and attached drawing disclosure of that.
Claims (1)
1. a kind of calibration method of switch action characteristic testing stand, it is characterised in that：Its step is：
(1) appearance and attachment inspection；
(2) the inspection of property working properly；
(3) the selection of calibration point:
1. the 70% of basic range, 80%, 90%, 100% should be selected to be calibrated as test point,
2. to non-basic range, chooses 100% range point and calibrated；
(4) output current virtual value is measured:
Testing stand output current virtual value is measured according to current divider method；
(5) current lead-through time accuracy is measured:
According to above-mentioned current divider method, the voltage waveform of load output end on current divider is intuitively shown on oscillograph, uses oscillography
Device cursor function read current duration, the error of output current turn-on time are indicated with following formula：
γT=T-T1
In formula：γTThe error of-output current turn-on time
T-testing stand shows output current turn-on time
T1- measured test platform output current turn-on time；
(6) insulation measurement:
The insulation resistance between every circuit and exposed conductive component, between circuit and ground is measured, the resistance >=500k Ω；
(7) ground resistance measures:
The ground resistance between each exposed conductive part and ground is measured, the Ω of the resistance≤0.1；
(8) temperature measurement:
1. for carrying out the testing stand of delay test, in the delaying current and admittance that admittance is indicated according to manufacturer in specification
After time, any contact of busbar and galvanic circle that test electric current is flowed through,
2. for the testing stand of wink dynamic test, in the transient current and 200ms that admittance is indicated according to manufacturer in specification
Between admittance, and the time interval tested is less than 3 minutes, and the busbar that is flowed through of test electric current and any of galvanic circle connect
The Wen Shengjun of point, any node for the busbar and galvanic circle that test electric current is flowed through is less than 95 DEG C, conductor naked copper tie point
Temperature rises 35 DEG C, meets the requirements；
The current divider method measuring test-bed output current virtual value, the specific steps are：
Current divider seals in testing stand electric current output loop, and current divider output termination oscillograph sets output current, when electric current passes through
When, time scale and the triggering setting of oscillograph are adjusted, the voltage change waveform at current divider both ends is obtained, according to Ohm's law I
=U/R obtains the output current virtual value of testing stand,
Output current virtual value relative error is indicated with following formula：
In above formula：γIThe relative error of-output current virtual value
I-testing stand shows output current virtual value
U-oscillograph measures voltage effective value
R-current divider resistance value.
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| CN105548930A (en) * | 2015-12-04 | 2016-05-04 | 天津电气科学研究院有限公司 | Metering calibration method for current tolerance of switch long delay test stand |
| CN105510855B (en) * | 2015-12-04 | 2018-04-06 | 天津电气科学研究院有限公司 | A kind of low-voltage circuit breaker acting characteristic testing stand calibration method |
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| US5594458A (en) * | 1989-12-11 | 1997-01-14 | Oesterreichisches Forschungszentrum Seibersdorf Ges.M.B.H. | Comb generator, device and process for calibrating measurement sections |
| JP4151566B2 (en) * | 2003-02-25 | 2008-09-17 | 株式会社デンソー | Microcomputer |
| CN1716493A (en) * | 2005-07-13 | 2006-01-04 | 吴桂初 | On-line intelligent checking table for low voltage breaker protective property |
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