CN101995535B - Method for judging credibility of CT (Computed Tomography) secondary side short circuit - Google Patents
Method for judging credibility of CT (Computed Tomography) secondary side short circuit Download PDFInfo
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- CN101995535B CN101995535B CN200910101863.7A CN200910101863A CN101995535B CN 101995535 B CN101995535 B CN 101995535B CN 200910101863 A CN200910101863 A CN 200910101863A CN 101995535 B CN101995535 B CN 101995535B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002591 computed tomography Methods 0.000 title abstract 8
- 238000004891 communication Methods 0.000 claims abstract description 35
- 238000004458 analytical method Methods 0.000 claims description 29
- 238000011084 recovery Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000012216 screening Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The invention relates to a method for judging credibility of a CT (Computed Tomography) secondary side short circuit, and belongs to the field of power system electric energy metering. At present, a traditional electric load management terminal or an electric consumption information collection terminal have the monitoring function of the CT secondary side short circuit, but the misinformation rate is very high owing to the complexity in technological realization. The method comprises the following steps of collecting CT secondary side current data at regular time, transmitting the current data to a master station communication module, storing the current data by a master station storage, and calculating the credibility x=I0/(I0+I1) and the average value of the credibility after detecting that the CT secondary side short circuit incident or short circuit is restored. By processing the short circuit and the current data in the short-circuit restore incident, the method can be used for screening out CT secondary side short-circuit users with high credibility in the electric load management system or electric consumption information collection system with lots of terminal misinformation alarms, and accurately positioning users who are possible to use electric energy illegally.
Description
Technical field
The present invention relates to a kind of electric system electric energy metrical field, espespecially a kind of method that judges CT secondary circuit short-circuit confidence level.
Background technology
In the time connecing electric access customer, need to use CT current transformer to realize the detection to user's electrical energy parameter, the in use short circuit of CT can not affect the normal operation of electrical network, but can make user's electric power meter occur gross error, this type of fault is generally people for causing, construction wrong also there will be this type of fault, and this is unfavorable for the management of power use, needs the short trouble of the CT secondary side to user's side accurately to detect for this reason.At present existing electricity load management terminal or power information acquisition terminal possess the function for monitoring of CT secondary circuit short-circuit, in the time finding that CT secondary circuit short-circuit or short circuit recover, can report CT secondary circuit short-circuit or short circuit to recover event.But due to the complicacy that technology realizes, rate of false alarm is very high.
Summary of the invention
In order to overcome the above-mentioned defect existing in prior art, the invention provides a kind of method of the CT of judgement secondary circuit short-circuit confidence level, to reduce rate of false alarm, be convenient to locate exactly the user who has stealing suspicion.For this reason, the present invention takes following technical scheme:
1, judge a method for CT secondary circuit short-circuit confidence level, it is characterized in that it comprises the steps:
1) by the current sample module timing acquiring CT secondary side current data that are connected with CT current transformer;
2) current data of current sample module collection is sent to Master station communication module by terminal communication module;
3) storer of main website is preserved the CT secondary side current data that Master station communication module obtains;
4) detect after CT secondary circuit short-circuit event when being positioned at the impedance detection module of terminal, this information exchange is crossed to terminal communication module and be sent to Master station communication module, arrive the analysis module being connected with Master station communication module;
5) analysis module is received after CT secondary circuit short-circuit event information, transfers the electric current I of the front nearest time point of short circuit in main website storer
0electric current I with a nearest time point after short circuit
1, and calculate CT secondary circuit short-circuit event confidence level X=I
0/ (I
0+ I
1);
6) detect after CT secondary circuit short-circuit recovery event when being positioned at the impedance detection module of terminal, this information exchange is crossed to terminal communication module and be sent to Master station communication module, arrive the analysis module being connected with Master station communication module;
7) analysis module receives that CT secondary circuit short-circuit recovers after event information, transfers the electric current I of the front nearest time point of short circuit recovery in main website storer
0' and the short circuit recovery electric current I of a nearest time point afterwards
1', and calculate CT secondary circuit short-circuit recovery event confidence level X '=I
1'/(I
0'+I
1');
8) analysis module is the mean value that each terminal is calculated all CT secondary circuit short-circuits and short circuit recovery event confidence level.
The terminal communication module that terminal includes current sample module, CT impedance detection module and is connected with both; Main website includes the Master station communication module being connected with terminal communication module network, the storer of store data and the analysis module that current data place is entered.
Diminish or during lower than a setting threshold, be designated as first short circuit event when impedance detection module detects that the impedance of CT secondary side is instantaneous; In the time that impedance detection module detects the instantaneous change of CT secondary side impedance greatly to setting threshold, be designated as first short circuit and recover event, after impedance detection module is judged to be short circuit event or short circuit recovery event by timely notification analysis module, so that analysis module handles accordingly.Can set when impedance detection module detects impedance and within 1 second, change that to reach 50% be that short circuit or short circuit recover event when above.
The present invention analyzes judgement to short circuit event and short circuit recovery event, to filter out CT secondary circuit short-circuit user with a high credibility, makes it to locate comparatively exactly the user who has stealing suspicion.
As the further of technique scheme improved and supplemented, the present invention also comprises following additional technical feature:
It also comprises that analysis module is that the confidence level that each terminal is calculated is carried out discriminatory analysis: in the time that confidence level is greater than a judgment threshold, think credible; In the time that confidence level is equal to or less than described judgment threshold, think insincere, described judgment threshold is more than or equal to 0.6.Confidence level scope is 0-1, represents that CT secondary circuit short-circuit or short circuit recover front and back electric current and do not change (insincere) in the time that confidence level is 0.5.General short circuit, can cause the significant change of electric current, if current value reduces half, confidence level is exactly 1/(0.5+1 so)=0.67, the situation intensity of variation of most short circuits is larger, therefore judgment threshold can be brought up to 0.6 or more than, in addition, confidence level itself is not just an absolute concept, it has shown believable degree, be worth more crediblely more greatly, when more, close to 1, confidence level is higher; When more, close to 0, confidence level is lower.
Analysis module carries out linear process to obtain suitable codomain scope to the confidence level after calculating.So that the management of postorder etc.
Beneficial effect: the present invention is by processing the current data in short circuit and short circuit recovery event, in the power load management system or power information acquisition system that exist great amount of terminals false alarm, filter out CT secondary circuit short-circuit user with a high credibility, there is the user of stealing suspicion in location comparatively exactly.
Brief description of the drawings
Fig. 1 is structure principle chart of the present invention;
Fig. 2 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.
As shown in Figure 1, the main website that the hardware the present invention relates to comprises the terminal of tool function for monitoring, is attached thereto by network, terminal comprises the current sample module that is connected with CT current transformer and impedance detection module, the terminal communication module being connected with current sample module and impedance detection module, and main website comprises the Master station communication module that is connected with terminal communication module communication, transmits the storer of data and the Analysis on confidence module to storer data analysis for preserving.
As shown in Figure 2, the present invention includes following step:
1) by the current sample module timing acquiring CT secondary side current data that are connected with CT current transformer;
2) current data of current sample module collection is sent to Master station communication module by terminal communication module;
3) storer of main website is preserved the CT secondary side current data that Master station communication module obtains;
4) when be positioned at the impedance detection module of terminal detect impedance instantaneous diminish or when a low setting threshold after be judged to be CT secondary circuit short-circuit event one time, and this information exchange is crossed to terminal communication module be sent to Master station communication module, arrive the analysis module being connected with Master station communication module;
5) analysis module is received after CT secondary circuit short-circuit event information, transfers the electric current I of the front nearest time point of short circuit in main website storer
0electric current I with a nearest time point after short circuit
1, and calculate CT secondary circuit short-circuit event confidence level X=I
0/ (I
0+ I
1);
6) detect after CT secondary circuit short-circuit recovery event when being positioned at the impedance detection module of terminal, this information exchange is crossed to terminal communication module and be sent to Master station communication module, arrive the analysis module being connected with Master station communication module;
7) analysis module receives that CT secondary circuit short-circuit recovers after event information, transfers the electric current I of the front nearest time point of short circuit recovery in main website storer
0' and the short circuit recovery electric current I of a nearest time point afterwards
1', and calculate CT secondary circuit short-circuit recovery event confidence level X '=I
1'/(I
0'+I
1');
8) analysis module is the mean value that each terminal is calculated all CT secondary circuit short-circuits and short circuit recovery event confidence level;
9) analysis module is that confidence level after each terminal is calculated is carried out discriminatory analysis, thinks credible when confidence level is greater than 0.6; In the time that confidence level is equal to or less than 0.6, think insincere.Certainly Credibility judgement threshold value also can suitably improve.In the time of this step of operation, also can carry out discriminatory analysis to the confidence level mean value of each terminal, obtain its overall confidence level, be convenient to make reliable data to judge user's stealing possibility.
For obtaining suitable codomain scope, analysis module can carry out linear process to the confidence level mean value after calculating, or Nonlinear Processing.
Recover in conjunction with short circuit event and short circuit the user that the sum of event and the mean value of confidence level can effective location exist stealing suspicion, strengthen the management of power use.
Claims (3)
1. judge a method for CT secondary circuit short-circuit confidence level, it is characterized in that it comprises the steps:
1) by the current sample module timing acquiring CT secondary side current data that are connected with CT current transformer;
2) current data of current sample module collection is sent to Master station communication module by terminal communication module;
3) storer of main website is preserved the CT secondary side current data that Master station communication module obtains;
4) detect after CT secondary circuit short-circuit event when being positioned at the impedance detection module of terminal, CT secondary circuit short-circuit event information is sent to Master station communication module by terminal communication module, arrive the analysis module being connected with Master station communication module;
5) analysis module is received after CT secondary circuit short-circuit event information, transfers the electric current I of the front nearest time point of short circuit in main website storer
0electric current I with a nearest time point after short circuit
1, and calculate CT secondary circuit short-circuit event confidence level X=I
0/ (I
0+ I
1);
6) detect after CT secondary circuit short-circuit recovery event when being positioned at the impedance detection module of terminal, CT secondary circuit short-circuit is recovered to event information and be sent to Master station communication module by terminal communication module, arrive the analysis module being connected with Master station communication module;
7) analysis module receives that CT secondary circuit short-circuit recovers after event information, transfers the electric current I of the front nearest time point of short circuit recovery in main website storer
0' and the short circuit recovery electric current I of a nearest time point afterwards
1', and calculate CT secondary circuit short-circuit recovery event confidence level X '=I
1'/(I
0'+I
1');
8) analysis module is the mean value that each terminal is calculated all CT secondary circuit short-circuits and short circuit recovery event confidence level.
2. a kind of method that judges CT secondary circuit short-circuit confidence level according to claim 1, is characterized in that it also comprises that analysis module is that the confidence level that each terminal is calculated is carried out discriminatory analysis: in the time that confidence level is greater than a judgment threshold, think credible; In the time that confidence level is equal to or less than described judgment threshold, think insincere, described judgment threshold is more than or equal to 0.6.
3. a kind of method that judges CT secondary circuit short-circuit confidence level according to claim 2, is characterized in that: analysis module carries out linear process to obtain suitable codomain scope to the confidence level after calculating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910101863.7A CN101995535B (en) | 2009-08-27 | 2009-08-27 | Method for judging credibility of CT (Computed Tomography) secondary side short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910101863.7A CN101995535B (en) | 2009-08-27 | 2009-08-27 | Method for judging credibility of CT (Computed Tomography) secondary side short circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101995535A CN101995535A (en) | 2011-03-30 |
| CN101995535B true CN101995535B (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910101863.7A Active CN101995535B (en) | 2009-08-27 | 2009-08-27 | Method for judging credibility of CT (Computed Tomography) secondary side short circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501588B (en) * | 2012-03-15 | 2019-06-11 | 江苏省电力公司常州供电公司 | A kind of short-circuit current of near zone of transformer monitoring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383108A (en) * | 2002-02-04 | 2002-12-04 | 莒县电业局 | Real-time monitor and analysis system for power supply network |
| CN1632606A (en) * | 2004-12-29 | 2005-06-29 | 重庆龙源科技产业发展有限公司 | Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus |
| CN201004074Y (en) * | 2007-02-13 | 2008-01-09 | 武汉中原电子信息公司 | Multi-functional power theft prevention real time measurement and recording device |
| CN201177758Y (en) * | 2008-04-16 | 2009-01-07 | 鞍山宏信电力电源设备有限公司 | Automatic control system for electrically smelted magnesia low-frequency smelting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009063360A (en) * | 2007-09-05 | 2009-03-26 | Kiyoko Shimizu | Energy consumption per unit monitoring system using plc communication |
-
2009
- 2009-08-27 CN CN200910101863.7A patent/CN101995535B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383108A (en) * | 2002-02-04 | 2002-12-04 | 莒县电业局 | Real-time monitor and analysis system for power supply network |
| CN1632606A (en) * | 2004-12-29 | 2005-06-29 | 重庆龙源科技产业发展有限公司 | Current transformer failure metering and electric larceny proof real-time on-line detection method and apparatus |
| CN201004074Y (en) * | 2007-02-13 | 2008-01-09 | 武汉中原电子信息公司 | Multi-functional power theft prevention real time measurement and recording device |
| CN201177758Y (en) * | 2008-04-16 | 2009-01-07 | 鞍山宏信电力电源设备有限公司 | Automatic control system for electrically smelted magnesia low-frequency smelting |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2009-63360A 2009.03.26 |
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| CN101995535A (en) | 2011-03-30 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130107 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130107 Address after: 310007 Huanglong Road, Hangzhou, Zhejiang, No. 8, No. Applicant after: Zhejiang Electric Power Company Applicant after: State Grid Corporation of China Address before: 310007 Huanglong Road, Hangzhou, Zhejiang, No. 8, No. Applicant before: Zhejiang Electric Power Company |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |