Common methods of stealing electricity and anti-stealing technology

Common methods of stealing electricity and anti-stealing measures

Common methods of stealing electricity

1, change the current stealing

The tampering has the following types: 1 disconnecting the secondary side of the TA, shorting the secondary side of the TA or shunting the TA, causing the current amplitude to become smaller or smaller; 2 changing the TA ratio, the ratio of the large current Replace the current transformer nameplate with the current transformer nameplate of the small current ratio; 3 Reverse the secondary polarity of the TA to reverse the meter.

2, change the voltage of electricity stealing

This kind of tampering has the following types: 1 loss of power stealing, disconnecting the TV insurance or installing a switch in the TV secondary circuit, disconnecting the voltage at any time to steal electricity; 2 undervoltage stealing, virtual voltage line, That is, the voltage wire core wire is broken, or the outer plastic is not peeled, and the pressure is directly crimped; 3 the TV secondary phase is reversed to make the meter reverse.

3. Change the structure and wiring of the meter

This kind of electricity theft has the following types: 1 Make a fuss on the meter, change the time constant of the meter, or make the meter not display, damage the mechanical transmission part; 2 change the position of the permanent magnet, make the gap between the magnet and the aluminum plate Smaller, the meter is slower; 3 change the meter current coil turns; 4 change the meter voltage and current phase sequence wiring, that is, the phase sequence is wrong.

4, strong AC magnetic field stealing

Some electronic energy meters use a stepper motor counter, and the stepper motor counter automatically counts under the action of a strong alternating magnetic field. When the direction of the magnetic field is changed, the counter will quickly count down, thereby realizing theft.

Anti-stealing measures

It can be seen from the above analysis that in order to achieve the purpose of stealing electricity,

Direct or indirect contact with the metering device (electric energy meter or

Transformer), so it can be reversed from both technical and management aspects

Stealing electricity.

Anti-stealing technical measures

1) For residential users, use centralized metering box or fully enclosed energy meter box, that is, line inlet pipe, pipe into box, box lock (sealing), so that people and tables are separated, so that users can not access the meter and two Secondary line.

2) The energy metering device for large users and industrial and mining enterprises shall be sealed by 3 parties, and the electricity monitoring department, the verification department and the user shall not open the metering box or metering cabinet from a private party. This has played a lot of role in anti-theft, especially the stealing of the authorization of the leadership.

3) For users with particularly high power consumption, an automatic video recording device can be added on the basis of 2). This is the most reliable measure to prevent electricity theft. It can prevent the thief from not accepting the account.

4) Use a new generation of electronic multi-function energy meter. Because the electronic energy meter can not be flipped, the bottom degree can not be cleared, the meter constant can not be changed, and there are anti-stealing power such as loss of pressure, flow loss record and current imbalance record, reverse phase sequence record, and event record such as setting table. Features.

5) For strong magnetic field stealing, the stepper motor counter (or the entire electric energy meter) can be shielded by a steel plate with a thickness greater than 1 mm, so that the strong AC magnetic field does not affect the normal operation of the electric energy meter.

6) Electric energy meter lock and lock system manufactured by two-dimensional code technology, supplemented by perfect daily business management process.

7) Adopt advanced anti-theft system (such as GSM mobile communication network as information transmission platform), promote the use of automatic meter reading system, real-time monitoring and scientific management of users' power consumption, in order to quickly find electricity theft behavior, prevent Suffering from it.