CN104330759A - Value traceability and monitoring method for low-voltage current transformer automation verification system - Google Patents
Value traceability and monitoring method for low-voltage current transformer automation verification system Download PDFInfo
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Abstract
The invention provides a value traceability and monitoring method for a low-voltage current transformer automation verification system. Value traceability is performed on the low-voltage current transformer automation verification system based on a network remote correction method. The method comprises monitoring test data of low-voltage current transformer inspection samples output by the verification system through a statistical method and performing risk early warning on the low-voltage current transformer. Comparing with the prior art, time required by correction is shortened, correction costs are reduced, and the metering center work delaying time of a measuring center is reduced; results can be re-inspected on line before verification, so that the correction quality is improved; sample testing and verification data statistical processing are completed automatically through a computer, the monitoring amount of the automation verification system state is reduced, and the reliability and the timeliness of state monitoring of the automation verification system are improved.
Description
Technical field
The present invention relates to a kind of magnitude tracing and monitoring method of verification system, be specifically related to a kind of magnitude tracing and monitoring method of low-voltage current mutual inductor automatic calibration system.
Background technology
Low-voltage current mutual inductor is used for the electric energy metrical in 0.4kV distribution line, and in order to ensure the fair and just of electric energy trade settlement, low-voltage current mutual inductor must could carry out at the scene installing and putting into operation after assay approval.Along with the fast development of economy, the demand of each area to electric power grows with each passing day, and the use amount of metering low-voltage current mutual inductor also synchronously increases sharply.Traditional manual mode calibrating low-voltage current mutual inductor, work efficiency is lower, and operation cost is higher, is difficult to ensure that standard verification is consistent with the height of verification result.
Automatic calibration system is integrated with management platform, automatic transmission facility and full-automatic mutual inductor calibrating installation, the calibrating plan can assigned according to production scheduling platform, complete automatic transmission, mutual inductor automation calibrating, data processing and complete monitoring, it is generally made up of unit such as pre-service, material loading, conveying, identification location, insulation measurement, power frequency withstand test, the strength test of Secondary Winding turn-to-turn insulation, fundamental error measurement, the measurement of magnetic saturation nargin, sorting labeling, blanking, aftertreatments.
Automatic calibration line also brings new test to the work of metering validation activity while improving calibrating efficiency.Because once automatic calibration line own reliability is bad, there is flase drop or false retrieval situation, will the verification result distortion of a large amount of mutual inductor be caused.If this situation is not by Timeliness coverage, the use of these mutual inductors, by forming the out of control of Electric energy measurement on a large scale, has a strong impact on the fair and just of electric energy trade.Therefore magnitude tracing and the method for monitoring operation states tool of studying automatic calibration system are of great significance.
Current transformer automatic calibration system possesses loading and unloading, identify, connect take out stitches, the function such as experimental test, data processing and report the test, it is integrated with multiple measurement standard and the instruments such as standard current transformer, mutual-inductor tester, Burden box, insulation resistance meter and Hi-pot Tester.Traditional magnitude tracing method is by above-mentioned standard and the instrument regulation according to its corresponding vertification regulation, calibrating standard, regularly deliver to legal metering validation activity to carry out examining and determine or calibrating, guarantee that it can carry out transmission of quantity value work after meeting the requirement of Regulations.Adopt this traditional magnitude transferring method to calibrate automatic calibration system and there is following problem:
1.: automatic calibration system complex structure, volume is comparatively large, and whole Transporting difficulty, does not possess the condition of overall censorship;
2.: after automatic calibration system Installation and Debugging complete, part of standards equipment and surveying instrument cannot or be difficult to dismantle completely, cause its censorship difficulty;
3.: instrument and equipment censorship process duration is longer, makes troubles to user, completing of its production task is affected;
4.: the calibration interval of most instrument and equipment are 1 year, in hoc anno, presumable overproof, and for its overproof time, existing amount transmission method is difficult to determine;
5.: personnel cost and business travel cost are comparatively large, can not carry out the field calibration in multiple place simultaneously, can not give full play to the advantage of metering expert.
To sum up, need the magnitude tracing and the monitoring method that propose a kind of low-voltage current mutual inductor automatic calibration system, realize the magnitude tracing of low-voltage current mutual inductor automatic calibration system, monitoring running state and Risk-warning, guarantee that the value of this verification system is reliable.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of magnitude tracing method of low-voltage current mutual inductor automatic calibration system, the network remote calibration method of described method carries out magnitude tracing to described low-voltage current mutual inductor automatic calibration system; Calibration data is transmitted step by step by described network.
Preferably, described network comprises and is connected to state's network metering system running management system, communication network between provincial measurement centre production scheduling platform and described automatic calibration system successively;
Verification result, to after Transfer Standards calibrating, is sent to described production scheduling platform by described automatic calibration system;
Preferably, the described calibration data of described low-voltage current mutual inductor is issued to State Grid Metering Center, provincial measurement centre and automatic calibration system according to by high-grade step by step to low-grade order;
Preferably, the amount limit of described Transfer Standards is limit identical with the amount of automatic calibration system; The accuracy of described Transfer Standards is greater than 0.02S level.
In order to meet the needs of prior art, based on the communication network that magnitude tracing method adopts, the invention provides a kind of monitoring method of low-voltage current mutual inductor automatic calibration system, described method statistic law monitors the test data of the low-voltage current mutual inductor verification sample that described verification system exports, and carries out Risk-warning according to described test data to low-voltage current mutual inductor; Described test data comprises ratio difference and the phase differential of described low-voltage current mutual inductor.
Preferably, described verification system timing is verified sample to low-voltage current mutual inductor and is carried out verification test, and test data is sent to the production scheduling platform of provincial measurement centre; The mean value of test data described in the data processing module statistical computation of described production scheduling platform and standard deviation, and the X-control chart and the standard deviation control chart that build described test data according to result of calculation;
Preferably, the time interval of described timing is cycle regular time or fixing low-voltage current mutual inductor calibrating amounts;
Preferably, the center line of described X-control chart and standard deviation control chart, upper control limit and lower control limit is calculated respectively according to JJF1033-2008 standard, and the range of control of upper control limit and lower control limit is divided into 6 districts from top to bottom, its top-down 1st district and the 6th district are Risk-warning district;
When described test data is in the Risk-warning district of X-control chart, then show that automatic calibration system is subject to the impact of not controlled systemic effect; When described test data is in the Risk-warning district of standard deviation control chart, then show the impact of the stochastic effects that automatic calibration system is not controlled.
The monitoring device that described method monitors described low-voltage current mutual inductor automatic calibration system comprises the host computer being arranged on provincial measurement centre production scheduling platform and the slave computer being arranged on automatic calibration system;
Described host computer, for managing the verification task of low-voltage current mutual inductor, and the low-voltage current mutual inductor that slave computer described in statistical study sends verifies the test data of sample;
Described slave computer, performs described verification task.
Preferably, described host computer comprises verification task management module, data reception module and data processing module;
Described verification task management module, for formulating the verification task of low-voltage current mutual inductor, and in the slave computer described verification task issued; The method formulating described verification task comprises:
Mode one: described slave computer auto-control verification system is once examined and determine low-voltage current mutual inductor at every turn after the identical time cycle;
Mode two: low-voltage current mutual inductor is divided into N group, often group comprises M platform low-voltage current mutual inductor, described slave computer auto-control verification system examines and determine next group low-voltage current mutual inductor again after having examined and determine one group of low-voltage current mutual inductor, described M and N is all at least 1;
Described data reception module, verifies the test data of sample for receiving described low-voltage current mutual inductor;
Described data processing module, calculates mean value and the standard deviation of described test data, and builds X-control chart and the standard deviation control chart of described test data according to result of calculation; Judge that whether described test data is normal according to X-control chart and standard deviation control chart, if test data normally, is stored in database, if test data is abnormal, send early warning signal to provincial measurement centre production scheduling platform.
Compared with immediate prior art, excellent effect of the present invention is:
The magnitude tracing of the low-voltage current mutual inductor automatic calibration system that the present invention proposes and monitoring method, substantially reduce the time required for calibration, decrease calibration cost, reduce delaying work the time of measurement centre; Operational order and calibration data are by Internet Transmission, and before verification process completes, its result can be rechecked online, substantially increases calibrating quality; Verification result is preserved in a database, calls and checks, can realize with no paper file administration simultaneously when managing after convenient, calibrate and verify; Control automatically to complete sample test by computing machine and verify data statistics processing, reducing the workload of Statisti-cal control, improve the reliability of Statisti-cal control and ageing.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: the magnitude tracing of the low-voltage current mutual inductor automatic calibration system in the embodiment of the present invention and monitoring method schematic diagram;
Fig. 2: the mean value of embodiment of the present invention mesolow current transformer automatic calibration system measurement result and standard deviation control chart;
Fig. 3: the structural drawing of embodiment of the present invention mesolow current transformer automatic calibration system pick-up unit.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The function of the low-voltage current mutual inductor automatic calibration system one, related in the embodiment of the present invention, state's network metering system running management system, provincial measurement centre production scheduling platform and intelligent warehousing system is:
1, low-voltage current mutual inductor automatic calibration system;
Low-voltage current mutual inductor automatic calibration system and intelligent warehousing system Seamless linkage, realize the operation such as mutual inductor automatic transmission, automatic connection, automatic Verification, automatic sorting, automatic labeling, automatic boxing, automatically warehouse-in, visual examination, insulation measurement, power frequency withstand test, the strength test of secondary turn-to-turn insulation, error testing test and magnetic saturation allowance test etc. are carried out to mutual inductor simultaneously.The multi-aspect informations such as the memory space of the production scheduling platform management mutual inductor automation calibrating system of provincial measurement centre and verification result.
The course of work of automatic calibration system mainly comprises:
1.: receive the verification task that production scheduling platform issues, comprise the model will examining and determine mutual inductor, the information such as quantity.
2.: the outbound task requests receiving the information such as mutual inductor model, quantity will examined and determine to warehouse application after verification task, and check warehouse go out library information.
3.: equipment is examined and determine, and uploads verification result to production scheduling platform.
2, state's network metering system running management system;
By calibrating, storage, dispensing module, on-the-spot operational management module, measuring system administration module, measurement instrument transmitting-receiving administration module composition, by concentrating Guo Wang company all kinds of metering production and operation data, key index, measuring system construction, work quality, service quality being produced to metering, business performs and power information acquisition applications and construction situation etc. are carried out comprehensive management and control and concentrate supervision.
3, provincial measurement centre production scheduling platform;
Be made up of related service functional modules such as production management, production monitoring, production analysis, production maintenances, the work order that the system of accepting business distributes, work order is changed into concrete operations instruction, auto-control verification system and Intelligent storage system complete the tasks such as calibrating and storage.
4, intelligent warehousing system;
Based on intelligent storage facilities for automatic stored technology and Modern Materials Circulation system, automatically fill (tearing open) case, automatic transporting in order to realize the measurement instrument storage process such as low-voltage current mutual inductor, automatically make an inventory, automatically go out warehouse-in and the intelligent management such as location automatically.
Two, the magnitude tracing method of a kind of low-voltage current mutual inductor automatic calibration system of the present invention's proposition, adopts network remote calibration method to carry out magnitude tracing to low-voltage current mutual inductor.
1, magnitude tracing;
Refer to and by one, there is the continual of regulation uncertainty and compare chain, the characteristic that the value of measurement result or measurement standard is connected with the normative reference (normally national measurement benchmark or international metering benchmark) of regulation, is called magnitude tracing.
Magnitude tracing grade figure, indicates a kind of block diagram representing hierarchal order of relation between the meter characteristic of surveying instrument and the mete-wand of specified rate.The topmost technological means realizing magnitude tracing is calibration and calibrating.
2, Transfer Standards;
Refer to measurement standard mutually relatively in the measurement standard of mediating.
3, as shown in Figure 1, above-mentioned network comprises the communication network be connected between state's network metering system running management system and the production scheduling platform of provincial measurement centre, and the communication network between this production scheduling platform and automatic calibration system.
Verification result, to after the class of accuracy calibrating of low-voltage current mutual inductor, is sent to production scheduling platform by automatic calibration system; This qualification result is sent to state's network metering system running management system by provincial measurement centre.
In the present embodiment, calibration data is transmitted step by step by network, is specially and the calibration data corresponding to the class of accuracy of low-voltage current mutual inductor is issued to state's network metering system, provincial measurement centre and automatic calibration system according to by high-grade step by step to low-grade order.Wherein, the amount of calibration Transfer Standards limit is limit identical with the usual amounts of automatic calibration system, and its accuracy is better than 0.02S level, physical dimension meet automatic calibration system transmission, connect and take out stitches and test request.
Three, the present invention proposes a kind of monitoring method of low-voltage current mutual inductor automatic calibration system, the test data of the low-voltage current mutual inductor that the method exports by statistic law monitoring automation verification system, and according to test data, Risk-warning is carried out to low-voltage current mutual inductor; Wherein, test data comprises ratio difference and the phase differential of low-voltage current mutual inductor.
Automatic calibration system timing carries out verification test to the verification sample of low-voltage current mutual inductor, and test data is sent to the production scheduling platform of provincial measurement centre; The data processing module of production scheduling platform calculates mean value and the standard deviation of test data, and X-control chart and the standard deviation control chart of test data is built according to computation structure, test data is verified, to judge that whether robotization identification systems are working properly finally by X-control chart and standard deviation control chart.Wherein, the time interval of timing is cycle regular time or fixing low-voltage current mutual inductor calibrating amounts.
In the present embodiment, the amount limit that low-voltage current mutual inductor used verifies sample is limit identical with the usual amounts of automatic calibration system, its accuracy is better than 0.2S level, and physical dimension meets the requirement of metering low-voltage current mutual inductor technical manual Q-GDW572, has good stability.
As shown in Figure 3, the monitoring device of upper method monitoring low-voltage current mutual inductor automatic calibration system, comprises the host computer being arranged on provincial measurement centre production scheduling platform and the slave computer being arranged on automatic calibration system;
Host computer, for managing the verification task of low-voltage current mutual inductor, and the low-voltage current mutual inductor that statistical study slave computer sends verifies the test data of sample; Slave computer, performs described verification task.
Host computer comprises verifies task management module, data reception module and data processing module;
1.: verify task management module, for formulating the verification task of low-voltage current mutual inductor, and in slave computer verification task issued; The method formulating verification task comprises:
Mode one: slave computer auto-control verification system is once examined and determine low-voltage current mutual inductor at every turn after the identical time cycle;
Mode two: low-voltage current mutual inductor is divided into N group, often group comprises M platform low-voltage current mutual inductor, and slave computer auto-control verification system examines and determine next group low-voltage current mutual inductor again after having examined and determine one group of low-voltage current mutual inductor, M and N is all at least 1;
Said method is automatic calibration system timing and carries out verification test to the verification sample of low-voltage current mutual inductor.
2.: data reception module, the test data of sample is verified for receiving low-voltage current mutual inductor.
3.: data processing module, calculate mean value and the standard deviation of test data, and build X-control chart and the standard deviation control chart of test data according to result of calculation; Judge that whether test data is normal according to X-control chart and standard deviation control chart:
If test data normally, is stored in database;
If test data is abnormal, send early warning signal to provincial measurement centre production scheduling platform.
Four, a preferred embodiment of the source tracing method of the present invention's proposition is:
The provincial measurement centre that the calibration data of the class of accuracy of low-voltage current mutual inductor sends by State Grid Metering Center, this calibration data is sent to the production scheduling platform of provincial measurement centre by state's network metering system running management system simultaneously.Provincial measurement centre formulates calibration operation plan by production scheduling platform after receiving calibration data, and calibration command is handed down to each automatic calibration system and intelligent warehousing system.After automatic calibration system receives calibration command, the calibration tasks calibrating Transfer Standards comprised according to calibration command, after having examined and determine, verification result is uploaded to production scheduling platform, by production scheduling platform, verification result is uploaded to state's network metering system running management system further, State Grid Metering Center judges after receiving this verification result that whether measurement result is accurate, if existing problems, then notify that provincial measurement centre rechecks, repeat process above.
Do not need staff to participate in process of tracing to the source, namely there is no human factor to the interference of verification result, thus ensure that the quality of remote calibration.
Five, a preferred embodiment of the monitoring method of the present invention's proposition is:
By statistic law, periodicity test is carried out and statistical test result to selected verification sample, build X-control chart and the standard deviation control chart of test data according to computation structure, to carry out continuously long-term Statisti-cal control to robotization identification systems.
Operation maintenance personnel formulates suitable verification scheme according to actual production ruuning situation, comprises the verification time, verifies frequency and verify sample.Whether the production scheduling platform of provincial measurement centre issues monitoring task, statistical test data according to this verification scheme and judges to verify result qualified.
The construction method of X-control chart and standard deviation control chart is:
1, automatic calibration system carries out n independently duplicate measurements to verification sample, each measures transport, the wiring included verification sample, the process such as to take out stitches; The measurement result measured this n time is as a subgroup.
2, each a period of time interval, repeats step 1, and in the present embodiment, measurement obtains k subgroup altogether; This time interval is cycle regular time or measures after detecting fixing low-voltage current mutual inductor calibrating amounts next time.
3, the mean value of each subgroup is calculated
with standard deviation s, and the mean value of k subgroup
and standard deviation
4, the centre line C L of calculating mean value control chart
s, upper control limit
and lower control limit
computing formula is respectively:
Calculate the centre line C L of standard deviation control chart
s, upper control limit UCL
swith lower control limit LCL
s, computing formula is respectively:
Wherein, A
3, B
3and B
4value with verification sample size relevant, concrete numerical value can by inquiry JJF1033-2008 " measurement standard examination specification " subordinate list C-1.
5, according to the result of calculation drafting control chart as shown in Figure 2 of step 4, X-control chart and standard deviation control chart is drawn according to concrete result of calculation and this control chart sample.
As shown in Figure 2, to control chart carry out verification result judge time, its range of control is divided into 6 districts from top to bottom, is labeled as A, B, C, C, B, A, the width in each district is all equivalent to the standard deviation of adopted Statisti-cal control amount.The probability that measurement point appears at A district is under normal circumstances about 4.28%, and therefore have measurement point to appear at A district once in a while and allow, but now answer attentional manipulation figure development trend after this, GuAQu is the Risk-warning district of automatic calibration system.If X-control chart occurs abnormal, then show that measuring process is subject to the impact of not controlled systemic effect, if standard deviation control chart occurs abnormal, then show that measuring process is subject to the impact of not controlled stochastic effects.When there are abnormal conditions, operation maintenance personnel needs to judge whether verification system breaks down, and takes suitable maintenance measure to eliminate abnormal.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (10)
1. a magnitude tracing method for low-voltage current mutual inductor automatic calibration system, is characterized in that, the network remote calibration method of described method carries out magnitude tracing to described low-voltage current mutual inductor automatic calibration system; Calibration data is transmitted step by step by described network.
2. the method for claim 1, is characterized in that, described network comprises and is connected to state's network metering system running management system, communication network between provincial measurement centre production scheduling platform and described automatic calibration system successively;
Verification result, to after Transfer Standards calibrating, is sent to described production scheduling platform by described automatic calibration system.
3. the method for claim 1, is characterized in that, the described calibration data of described low-voltage current mutual inductor is issued to State Grid Metering Center, provincial measurement centre and automatic calibration system according to by high-grade step by step to low-grade order.
4. method as claimed in claim 2, is characterized in that, the amount limit of described Transfer Standards is limit identical with the amount of automatic calibration system; The accuracy of described Transfer Standards is greater than 0.02S level.
5. the monitoring method of a low-voltage current mutual inductor automatic calibration system, it is characterized in that, described method statistic law monitors the test data of the low-voltage current mutual inductor verification sample that described verification system exports, and carries out Risk-warning according to described test data to low-voltage current mutual inductor; Described test data comprises ratio difference and the phase differential of described low-voltage current mutual inductor.
6. method as claimed in claim 5, is characterized in that, described verification system timing is verified sample to low-voltage current mutual inductor and carried out verification test, and test data is sent to the production scheduling platform of provincial measurement centre; The mean value of test data described in the data processing module statistical computation of described production scheduling platform and standard deviation, and the X-control chart and the standard deviation control chart that build described test data according to result of calculation.
7. method as claimed in claim 6, it is characterized in that, the time interval of described timing is cycle regular time or fixing low-voltage current mutual inductor calibrating amounts.
8. method as claimed in claim 5, it is characterized in that, the center line of described X-control chart and standard deviation control chart, upper control limit and lower control limit is calculated respectively according to JJF1033-2008 standard, and the range of control of upper control limit and lower control limit is divided into 6 districts from top to bottom, its top-down 1st district and the 6th district are Risk-warning district;
When described test data is in the Risk-warning district of X-control chart, then show that automatic calibration system is subject to the impact of not controlled systemic effect; When described test data is in the Risk-warning district of standard deviation control chart, then show the impact of the stochastic effects that automatic calibration system is not controlled.
9. method as claimed in claim 5, it is characterized in that, the monitoring device that described method monitors described low-voltage current mutual inductor automatic calibration system comprises the host computer being arranged on provincial measurement centre production scheduling platform and the slave computer being arranged on automatic calibration system;
Described host computer, for managing the verification task of low-voltage current mutual inductor, and the low-voltage current mutual inductor that slave computer described in statistical study sends verifies the test data of sample;
Described slave computer, performs described verification task.
10. method as claimed in claim 9, is characterized in that, described host computer comprises verifies task management module, data reception module and data processing module;
Described verification task management module, for formulating the verification task of low-voltage current mutual inductor, and in the slave computer described verification task issued; The method formulating described verification task comprises:
Mode one: described slave computer auto-control verification system is once examined and determine low-voltage current mutual inductor at every turn after the identical time cycle;
Mode two: low-voltage current mutual inductor is divided into N group, often group comprises M platform low-voltage current mutual inductor, described slave computer auto-control verification system examines and determine next group low-voltage current mutual inductor again after having examined and determine one group of low-voltage current mutual inductor, described M and N is all at least 1;
Described data reception module, verifies the test data of sample for receiving described low-voltage current mutual inductor;
Described data processing module, calculates mean value and the standard deviation of described test data, and builds X-control chart and the standard deviation control chart of described test data according to result of calculation; Judge that whether described test data is normal according to X-control chart and standard deviation control chart, if test data normally, is stored in database, if test data is abnormal, send early warning signal to provincial measurement centre production scheduling platform.
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| CN106353712A (en) * | 2016-08-26 | 2017-01-25 | 国家电网公司 | The monitoring method of automatic calibration line by the three-phase intelligent electric energy meter |
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| CN110687492A (en) * | 2019-08-21 | 2020-01-14 | 国网湖北省电力有限公司计量中心 | Method and system for monitoring detection quality of automatic verification system of low-voltage current transformer on line |
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| CN110907883B (en) * | 2019-10-25 | 2023-04-14 | 湖北省计量测试技术研究院 | Metering supervision method and system for automatic verification system of electric energy meter |
| CN112213686A (en) * | 2020-08-27 | 2021-01-12 | 国网山东省电力公司日照供电公司 | Checking system of automatic calibrating device of electric energy meter |
| CN112161647A (en) * | 2020-09-11 | 2021-01-01 | 向友刚 | Measuring instrument, measuring transmission/tracing method thereof, measuring instrument management system and method |
| CN115656910A (en) * | 2022-12-27 | 2023-01-31 | 太原山互科技有限公司 | Remote calibration system, method and equipment for mutual inductor calibration instrument |
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