Common methods of stealing electricity - Solutions - Huaqiang Electronic Network

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1. Modify the current coil of the short-circuit metering device. Usually, the current coil is short-circuited by wires inside or outside the electric energy meter. It is more common to use a wire or a parallel resistor to insert the phase line input end and the output end of the electric energy meter to function as a shunt. Short-circuit with wire, and the wire resistance is almost equal to zero, most of the current will pass through the short-circuit wire, the current coil of the energy meter has almost no current, causing the energy meter to stop; if the resistance is less than the resistance of the current coil, the current The coil and the parallel resistor form a parallel circuit. According to the shunting principle of the parallel circuit, most of the current will pass through the parallel resistor, and the current coil only has a small current to pass, so that the electric energy meter rotates slowly according to a certain ratio, thereby achieving the purpose of stealing electricity. This type of stealing is called undercurrent stealing.
2. Disconnect the voltage link or connect the voltage divider resistor on the voltage coil. Disconnecting the voltage coil is to make the voltage coil lose pressure and cause the meter to not rotate. A common method is to loosen the voltage connection piece of the electric energy meter. This method does not need to open the surface seal, and is a lower-level stealing method. The new ordinary electric meter has shorted the joint inside the electric meter. Second, the meter cover is connected to the voltage coil by a resistor, and the series resistor is covered with an insulating tape or an insulating sleeve (with concealability). The principle is to share voltage and share a part of the voltage. Both ends of the resistor reduce the voltage across the voltage coil to achieve the goal of reducing the amount of power. This type of method is also called undervoltage thief.
3. Adjust the zero fire line to steal electricity. The method of stealing electricity is to adjust the fire and the zero line of the electric energy meter into the line end in advance. According to the internal circuit structure of the electric energy meter, the input and output of the zero line end are short-circuited by the joint piece, so the thief can use The self-designed (or connected) neutral line uses electricity, and the electric energy meter stops the electric meter because there is no current loop in the opposite direction through the current coil of the electric energy meter. This method of tampering must be equipped with a switch control switch inside the room so that the neutral line passing through the energy meter and the self-set ground line (or another neutral line) can be freely controlled. However, the self-designed ground line will pose a serious threat to the user's safe use of electricity.
4. Break the zero stealing. This method of stealing must previously disconnect and conceal the neutral line of the energy meter inlet. Similar to the tampering method, it is necessary to connect or install the ground wire separately, and install the switch in the room. After disconnecting the meter input zero line, the current coil can still pass current, and the voltage coil will lose voltage. At this time, the electricity thief uses electricity, and the meter will not measure. When the thief wants to turn the meter to measure the meter, it can be connected to the zero potential (ie, the other zero line or the self-set ground line) from the output end of the meter's neutral line. The voltage coil obtains the voltage and the meter rotates. Second, the resistance is connected in series on the wire connected to the zero potential, which is similar to the undervoltage method, and plays a role in reducing the amount of electricity. This type of method is also known as the zero-cut method.
5. The specific method of replacing the counter gear is to replace the meter of the large-capacity electric energy meter with the meter of the small-capacity electric energy meter, and the electric quantity calculated by the replaced electric energy meter is doubled compared with the actual electric power consumption. For example, replace the 10(20)A 900r/kWh meter with a 5(10)A 1800r/kWh meter meter. Since the current coil and voltage coil of the meter do not change, the aluminum disc speed does not change. However, after the meter was replaced, the original 900 rpm was actually used for one degree, and it became a turn of 1800 rpm, and the metered power was reduced by half compared with the actual power consumption. The main point of this method of stealing electricity is to use the same manufacturer's electric energy meter to be able to exchange the meter, otherwise the mechanical size cannot correspond. The first step in stealing electricity by this method is to open the meter seal. However, the electric meter seals used by the power supply department are all new seals and have good anti-tampering performance.
6. Bypassing the metering device, stealing electricity, bypassing the metering device, stealing electricity is mainly reflected in the private connection line. The biggest feature of this method of stealing electricity is that it is easy to operate and is more likely to damage the electricity theft site. At the time, the power stealing wires were pulled apart in a timely manner, so that the power-checking personnel could not obtain evidence. Because the contact resistance of the private wire of the tampering household is high, and the bare or insulating tape is not tightly sealed and reacts with the air, the contact resistance is further increased, and the flashing break or even the wire breaks under the thermal effect of the current. . Such tampering methods pose a serious threat to the safe operation of power lines.