How to prevent pre-paid meter from being stolen

For a long time, the problem of power theft has been plaguing the power supply department. Although the power supply department has stepped up measures to prevent electricity theft in many aspects, it has been difficult for anti-theft work due to the proliferation of power theft measures. , The magic is ten feet. For this reason, it is very necessary for us to study the methods of stealing electricity, in order to better improve the anti-theft technology level and completely plug the loopholes.

1 Theft principle analysis

The purpose of stealing electricity is to obtain electricity at no cost, and its means is to make metering meters less or not. Therefore, we must start with the theory of how the electricity meter works. We know that watt-hour meters use the voltage and current coils to generate electromagnetic force through the interaction between the eddy current and the alternating magnetic flux generated in the aluminum disk, which causes the aluminum disk to rotate. At the same time, the braking torque is introduced to make the speed of the aluminum disk proportional to the load power. Through the axial gear transmission, the meter accumulates the rotational speed of the turntable and measures the electrical energy. Therefore, the main structure of the power meter is composed of a voltage coil, a current coil, a turntable, a shaft, a brake magnet, a gear, and a meter. Known by the principle of the function of the meter, changing the input current meter current, voltage, phase, and changing the speed meter, gear ratio, etc. can achieve the purpose of stealing electricity. The following points are divided to change the electrical parameters (current, voltage, phase) and mechanical parameters (rotation speed, gear ratio) of the meter to analyze the common methods of stealing.

2 Stealing methods

1. Change the electric parameter method of the electric meter

2. Change the mechanical parameter method of the electricity meter

3 Methods of prevention

To change the input power meter current, voltage level or change the meter current and voltage stealing method, the power supply personnel can only find out the truth as long as they strengthen the visual inspection and verify the meter of the suspect user. For users who steal electricity by mechanical methods, there is no obvious trace of stealing electricity, and it is difficult to find out the truth. Even if it is discovered, it can also get rid of the charges by taking advantage of the mechanical failure of the power meter itself. In the past, there were few articles that disclosed the method of stealing electricity in this area. Therefore, the power supply personnel were reminded to take special precautions against such means of stealing electricity.

In fact, as long as it is a little tricky, it is not difficult to open the seal of the existing watt-hour meter: Use a small, flat-shaped screwdriver or needle to widen the wider end of the seal seal, and then pull the seal line with force. When reloading, use a suitable size needle to expand the seal hole so that the original thread can be returned from the original position. After installation, use a pair of smooth pliers or other tools to press firmly, so that the line can not be drawn out, as long as the force is appropriate, will not harm the mark of the original lead cover, you can do not see the traces have been removed.