CN104459249A - Abnormal electricity judgment method based on current abnormality analysis - Google Patents

Abstract

The invention discloses a method for judging abnormal electricity consumption based on abnormal current analysis, which includes abnormal analysis of current loss and abnormal analysis of current unbalance; the phase current of three or more monitoring points needs to be monitored within one day for current loss. Abnormal current flow analysis, and monitoring for 3 consecutive days; if the abnormal current loss analysis results at 3 or more monitoring points for 3 consecutive days confirm that the current loss is abnormal, it will be finally determined that the user is abnormally consuming electricity. The phase current of at least 10 monitoring points needs to be monitored within 1 day for current unbalance analysis, and the monitoring should be carried out for at least 3 consecutive days; if the results of the current unbalance analysis at the monitoring points for 3 consecutive days all confirm the current unbalance, the final determination The user uses power abnormally. The method for judging abnormal power consumption based on abnormal current analysis of the present invention has the advantages of being able to grasp power consumption information of power users in time, preventing and monitoring power theft, and improving power supply reliability.

Description

Judgment method of abnormal power consumption based on abnormal current analysis

technical field

The invention relates to a method for judging abnormal electricity consumption based on abnormal current analysis.

Background technique

With the rapid development of urban construction, the demand for electricity in various industries continues to expand. However, with the rapid development of the economy and the continuous increase of electricity consumption, the problem of electricity theft has become more and more prominent. The power behavior is more concealed, causing serious power loss for power supply companies. The problem of stealing electricity not only affects the normal order of power supply and consumption of electric power enterprises, but also seriously affects economic development and social stability. Therefore, only by better improving the level of anti-stealing technology, completely plugging the loopholes of stealing electricity, and creating a good order of power supply and consumption, can we better escort the rapid development of society.

At present, a large number of anti-stealing measures and related preventive measures have been carried out in the power supply system, but the existing traditional measures have been unable to keep up with the ever-changing ways of stealing electricity, and it is difficult to detect electricity theft in time. The existing anti-stealing system mainly has the following defects.

(1) Although the on-site manifestations of stealing electricity are various, the existing anti-stealing measures for various specific ways of stealing electricity can no longer adapt to the new type of stealing electricity.

(2) Due to the failure to effectively integrate the electricity consumption information of electricity customers during the anti-stealing inspection, the anti-stealing inspection is less targeted.

(3) Electricity theft by users cannot be detected in time, and some electricity theft behaviors are often discovered only when the general survey or line loss is abnormal. For the case of resisting inspection and destroying evidence, it is difficult to detect electricity theft.

Contents of the invention

The present invention aims to avoid the shortcomings in the above-mentioned prior art, and provides a method for judging abnormal power consumption based on abnormal current analysis, so as to grasp power consumption information of power users in time, and prevent and monitor power theft.

The present invention adopts the following technical solutions to solve the technical problems.

The method of judging abnormal power consumption based on abnormal current analysis is characterized in that the abnormal current analysis includes two analysis methods: abnormal current loss analysis and abnormal current unbalance analysis;

The process of the abnormal analysis of the current loss is as follows:

First, determine that the voltage range of the ammeter is 0.7 to 0.9 rated voltage (ABC three-phase voltage must meet this voltage range), and then determine whether the user's ammeter is connected in a three-phase three-wire system or a three-phase four-wire system;

If the user's ammeter connection mode is three-phase three-wire system, then detect the ABC three-phase current of the user's ammeter, if the current of any phase in the AC phase is less than 0.5% of the rated current and the B-phase current is not less than 5% of the rated current, then determine the current of the ammeter. Abnormal drain flow;

If the user's ammeter connection mode is three-phase four-wire system, then detect the ABC three-phase current of the user's ammeter, if any phase current of the ABC three-phase current is less than 0.5% of the rated current and at least one of the other two phases is not less than 10 % rated current, it is determined that the ammeter current loss is abnormal;

It is necessary to monitor the phase current of 3 or more monitoring points within 1 day for abnormal analysis of current loss, and monitor for 3 consecutive days; if the current loss is carried out at 3 or more monitoring points for 3 consecutive days If the abnormal analysis results all confirm that the current loss is abnormal, it is finally determined that the user is abnormally consuming electricity;

The process of current unbalance analysis is as follows: first, exclude the current loss and detect the ABC three-phase current of the user's ammeter; in the case that the current of each phase in the ABC three-phase is greater than 0, calculate the current unbalance rate; The formula for calculating the current unbalance rate is:

Current unbalance rate=[max(Ia,Ib,Ic)-min(Ia,Ib,Ic)]/max(Ia,Ib,Ic), where max(Ia,Ib,Ic) is the ABC three-phase current The maximum value of the current, min(Ia, Ib, Ic) is the minimum value of the current in the ABC three-phase current;

If the current unbalance rate is greater than the preset value, the current is considered unbalanced;

It is necessary to monitor the phase current of at least 10 monitoring points within 1 day (up to 96 points can be monitored in one day, and the range of monitoring points is 10-96) for current unbalance analysis, and at least 3 consecutive days (this number of days can be greater than or equal to 3 days, For example, it can be monitored for 5 days, 7 days, or 10 days according to the actual situation; if the current unbalance analysis results at the monitoring point for 3 consecutive days confirm that the current is unbalanced, it is finally determined that the user is abnormally consuming electricity.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

The method for judging abnormal electricity consumption based on abnormal current analysis of the present invention includes abnormal analysis of current loss and abnormal analysis of current imbalance; phase currents at 3 or more monitoring points need to be monitored within one day to analyze abnormal current loss , and monitor for 3 consecutive days; if the abnormal current loss analysis results at 3 or more monitoring points for 3 consecutive days all confirm that the current loss is abnormal, then it is finally determined that the user is abnormally consuming electricity. The phase current of at least 10 monitoring points needs to be monitored within 1 day for current unbalance analysis, and the monitoring should be carried out for at least 3 consecutive days; if the results of the current unbalance analysis at the monitoring points for 3 consecutive days all confirm the current unbalance, the final determination The user uses power abnormally.

For specific judgment, the two methods of current loss abnormal analysis and current unbalance abnormal analysis can be judged independently or combined with each other.

The method for judging abnormal power consumption based on abnormal current analysis of the present invention has the advantages of being able to grasp power consumption information of power users in time, preventing and monitoring power theft, and improving power supply reliability.

Description of drawings

FIG. 1 is a structural block diagram of a judging system of the method for judging abnormal power consumption based on abnormal current analysis of the present invention.

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

Detailed ways

Referring to Fig. 1, the method for judging abnormal electricity consumption based on abnormal current analysis of the present invention, the abnormal current analysis includes two analysis methods: abnormal current loss analysis and abnormal current imbalance analysis;

The process of the abnormal analysis of the current loss is as follows:

First, determine that the voltage range of the ammeter is 0.7 to 0.9 rated voltage (ABC three-phase voltage must meet this voltage range), and then determine whether the user's ammeter is connected in a three-phase three-wire system or a three-phase four-wire system;

If the user's ammeter connection mode is three-phase three-wire system, then detect the ABC three-phase current of the user's ammeter, if the current of any phase in the AC phase is less than 0.5% of the rated current and the B-phase current is not less than 5% of the rated current, then determine the current of the ammeter. Abnormal drain flow;

If the user's ammeter connection mode is three-phase four-wire system, then detect the ABC three-phase current of the user's ammeter, if any phase current of the ABC three-phase current is less than 0.5% of the rated current and at least one of the other two phases is not less than 10 % rated current, it is determined that the ammeter current loss is abnormal;

It is necessary to monitor the phase current of 3 or more monitoring points within 1 day for abnormal analysis of current loss, and monitor for 3 consecutive days; if the current loss is carried out at 3 or more monitoring points for 3 consecutive days If the abnormal analysis results all confirm that the current loss is abnormal, it is finally determined that the user is abnormally consuming electricity;

The process of current unbalance analysis is as follows: first, exclude the current loss and detect the ABC three-phase current of the user's ammeter; in the case that the current of each phase in the ABC three-phase is greater than 0, calculate the current unbalance rate; The formula for calculating the current unbalance rate is:

Current unbalance rate=[max(Ia,Ib,Ic)-min(Ia,Ib,Ic)]/max(Ia,Ib,Ic), where max(Ia,Ib,Ic) is the ABC three-phase current The maximum value of the current, min(Ia, Ib, Ic) is the minimum value of the current in the ABC three-phase current;

If the current unbalance rate is greater than the preset value, the current is considered unbalanced;

It is necessary to monitor the phase current of at least 10 monitoring points within 1 day (up to 96 points can be monitored in one day, and the range of monitoring points is 10-96) for current unbalance analysis, and at least 3 consecutive days (this number of days can be greater than or equal to 3 days, For example, it can be monitored for 5 days, 7 days, or 10 days according to the actual situation; if the current unbalance analysis results at the monitoring point for 3 consecutive days confirm that the current is unbalanced, it is finally determined that the user is abnormally consuming electricity.

The method for judging abnormal electricity consumption based on abnormal current analysis of the present invention includes two analysis methods: abnormal analysis of current loss and abnormal analysis of current imbalance.

There are two manifestations of abnormal current, current loss and current imbalance.

(1) Current loss:

Need to meet the voltage range of 0.7 to 0.9 rated voltage. Three-phase three-wire current loss: the current of any phase in the AC phase is less than 0.5% of the rated (basic) current, and the current of the other phase is not less than 5% of the rated (basic) current. Three-phase four-wire current loss: the current of any phase is less than 0.5% of the rated (basic) current, and the current of at least one of the other two phases is not less than 10% of the rated (basic) current.

For example: three-phase three-wire electric energy meter wiring, rated voltage 320, rated current 4.4A, then 4.4*0.5% = 0.022, 4.4*0.5% = 0.22.

The monitored phase A current is 0.956, the phase B current is 0.001, and the phase C current is 0.002. If the BC two-phase current is less than 0.022, while the A-phase current is greater than 0.956 and greater than 0.22, and similar situations are detected more than 3 times in one day, it is considered that the electric energy meter has an abnormal current loss on that day.

If a current loss event is detected on the electric energy meter, and at least one point is detected within a day, a current loss abnormality will be generated; otherwise, at least multiple points (3 points per day by default) will be detected to generate an abnormality.

(2) Current imbalance

When the current of each phase is greater than 0, calculate the current unbalance rate according to the following formula.

Current unbalance rate=[max(Ia,Ib,Ic)-min(Ia,Ib,Ic)]/max(Ia,Ib,Ic), where max(Ia,Ib,Ic) is the ABC three-phase current The maximum value of the current, min(Ia, Ib, Ic) is the minimum value of the current in the ABC three-phase current.

For example: the preset standard value of current unbalance rate is 20%.

The A-phase current, B-phase current 0.001, and C-phase current 0.021 collected at 0 o’clock by a meter in a household, the voltage unbalance rate calculation: (0.023-0.001)/0.023=95.65%, if it is detected 6 times in a day at the same time If the current unbalance rate exceeds 20%, it is considered that the electric energy meter has an abnormal current unbalance.

Through the current imbalance, judge whether the limit is exceeded. Abnormal current loss needs to be ruled out first. Multiple points need to be monitored in one day, and the abnormality will only be generated if the continuous monitoring meets the data judgment requirements for many days (default 10 points per day, 3 consecutive days).

For specific judgment, the two methods of current loss abnormal analysis and current unbalance abnormal analysis can be judged independently or combined with each other.

Figure 1 is a structural block diagram of the anti-stealing power system based on the abnormal power consumption judgment method based on the abnormal current analysis of the present invention, including a data module, a power-stealing diagnosis and analysis module, a power-stealing judgment module and an abnormal alarm module. The data module, electricity stealing diagnosis and analysis module, electricity stealing judgment module and abnormal alarm module are connected in sequence. First, the data module collects the user's current information, and then the electricity stealing diagnosis and analysis module uses the method of the present invention to perform data analysis to determine which users are abnormal electricity users, and transmits the analyzed results to the electricity stealing judgment module, which is judged by the electricity stealing According to the results of data analysis, the module further judges which abnormal power users are power stealing users, and finally the abnormal alarm module provides alarm information to notify the staff which are power stealing users, and the staff will go to the power stealing site for verification and processing.

During the specific work, the staff will conduct abnormal analysis from the four aspects of online monitoring, user power, line loss, and historical power theft behavior to obtain the abnormal user pool. To determine the security, to quantify the user's electricity stealing possibility, the determination rules are as follows:

1. Judgment of abnormal level

For various abnormalities, the levels are set, and the levels are divided into three types: I-level, II-level, and IV-level abnormalities. At the same time, it is also possible to set the "whether to participate in the determination of electricity stealing suspicion" for abnormalities.

Level I abnormality: the number of abnormal days in the judgment cycle exceeds A days;

Level II abnormality: the number of abnormal days in the judgment cycle exceeds B days;

Level IV abnormality: The number of abnormal days in the judgment cycle exceeds C days. Wherein, A>B>C, and A, B, and C are all preset values, which are positive integers.

2. Judgment on suspicion of electricity theft

According to the abnormal type and abnormal level, the rules for judging suspected electricity theft can be flexibly set. According to the actual situation, select the basis for the judgment of suspicion. For example, when we believe that one or several abnormalities occur at the same time and the abnormality level reaches a certain level, we regard the level of suspicion as major suspicion or suspicion.

According to the established rules of suspect determination, locate the range of users with major suspicions. After receiving the accurate user information, the anti-stealing staff will carry the electricity inspection instrument to the scene for investigation and processing. The electricity inspection instrument uses the latest microprocessor technology and Digital signal processing technology, using direct AC sampling method to realize power frequency electrical parameter measurement (such as voltage, current effective value, active power, reactive power, apparent power, power frequency frequency, power factor, phase relationship, etc.) can directly display vector diagrams , especially suitable for each power supply unit to check the wiring status of the electric energy billing system and the relay protection system. According to the on-site inspection, it is determined whether the user actually has electricity stealing behavior, and the inspection and processing results are maintained in this system, so as to realize the closed-loop management of anti-electricity stealing work from abnormal analysis, suspect judgment, and suspect processing.

(1) Data module: The system data comes from the electricity consumption information collection system, load control system, SG186 marketing system, and line loss management system. We use ETL technology, data center technology, data mining technology and multi-dimensional data analysis technology to analyze and process data such as classification, correlation, anomaly, clustering, etc., and gradually form a scientific and reasonable anti-stealing behavior characteristic data model.

(2) Electricity theft diagnosis and analysis module: Based on the actual business situation, a electricity theft diagnosis model is established;

Online monitoring of abnormal power consumption: According to the real-time data of the acquisition system, online monitoring of the user's power consumption is carried out, and in various abnormal power consumption situations, attention is paid to abnormalities related to power theft, and timely detection of suspected users of power theft.

Abnormal power consumption: pay attention to the power consumption of users within a certain period of time, analyze abnormal power consumption, and promptly detect users suspected of stealing power.

Abnormal line loss: analyze the abnormality of line loss and station area loss, and timely discover lines or station areas suspected of stealing electricity, providing a strong basis for tracking electricity stealing users.

Historical electricity stealing behavior: Enter the user's historical electricity stealing behavior, and these users will be used as key monitoring users to prevent such users from committing crimes repeatedly.

(3) Electricity theft determination module: According to the electricity theft diagnosis model, establish the electricity theft judgment and evaluation rules, comprehensively analyze the user’s electricity theft possibility, and finally determine the scope of the suspected electricity theft users.

(4) Abnormal alarm module: The system is responsible for providing abnormal alarms to the anti-stealing staff of the power supply company. After receiving the alarm notification, the staff need to go to the scene to conduct investigation and processing, and are responsible for timely inputting the processing results into the system.

The abnormal power consumption judging method based on the abnormal current analysis of the present invention will provide powerful help for anti-stealing personnel to discover and grasp the information of stealing electricity. Through the integration of line loss data, operation data and management data through digital and informatized technical means, it is possible to grasp the power consumption information of power users in time, prevent and monitor power theft, reduce line loss, and improve power supply reliability. The inspectors check the user's electricity theft behavior and provide decision-making basis for the management of the power supply department.

The method for judging abnormal power consumption based on abnormal current analysis of the present invention has the advantages of being able to grasp power consumption information of power users in time, preventing and monitoring power theft, and improving power supply reliability.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (1)

1., based on the abnormal electricity consumption determination methods that current anomaly is analyzed, it is characterized in that, current anomaly analysis comprises two kinds of analytical approachs: electric current defluidization anomaly analysis and current imbalance anomaly analysis;

The process of described electric current defluidization anomaly analysis is:

First, determine that the voltage range of ammeter is 0.7 to 0.9 rated voltage, then judge that the ammeter mode of connection of user is three-phase three-wire system or three-phase four-wire system;

If the ammeter mode of connection of user is three-phase three-wire system, then detect the ABC three-phase current of electric supply meter, if arbitrary phase current is less than 0.5% rated current and B phase current is not less than 5% rated current in AC phase, then determine that ammeter electric current defluidization is abnormal;

If the ammeter mode of connection of user is three-phase four-wire system, then detect the ABC three-phase current of electric supply meter, if arbitrary phase current is less than 0.5% rated current and in another two-phase, at least one phase current is not less than 10% rated current in ABC three-phase current, then determine that ammeter electric current defluidization is abnormal;

Need the phase current of the monitoring point monitoring more than 3 or 3 to carry out electric current defluidization anomaly analysis in 1 day, and monitor for three days on end; If the electric current defluidization anomaly analysis result that the monitoring point for three days on end more than 3 or 3 is carried out all determines that electric current defluidization is abnormal, then finally determine that user is abnormal electricity consumption;

The process of current imbalance analysis is: first, and eliminating is the situation of electric current defluidization and detects the ABC three-phase current of electric supply meter; Each phase current in ABC three-phase is all greater than 0, calculating current unbalance factor; The computing formula of described current imbalance rate is:

Current imbalance rate=[max (Ia, Ib, Ic)-min (Ia, Ib, Ic)]/max (Ia, Ib, Ic), wherein, max (Ia, Ib, Ic) be current maxima in ABC three-phase current, min (Ia, Ib, Ic) is current minimum in ABC three-phase current;

If current imbalance rate is greater than preset value, then think current imbalance;

Need the phase current monitoring at least 10 monitoring points to carry out current imbalance analysis in 1 day, and within least 3 days, monitor continuously; If the current imbalance analysis result carried out in monitoring point for three days on end all determines current imbalance, then finally determine that user is abnormal electricity consumption.