The application of power systems in People's Daily lives is very extensive. Among them, the installation of switch cabinets and distribution cabinets is a very important component in the construction of power systems. During the electrical installation process, there are many details and precautions that need to be paid attention to. The interference problem between electrical equipment is one aspect that needs to be emphasized. Therefore, in order to avoid circuit signal interference, A series of anti-interference measures need to be taken. Now let's take a look at the specific anti-interference measures for industrial electrical installation.
1. The cabinet is properly grounded
If there are two different grounding points in the electrical control cabinet, it will lead to the generation of interference sources. Therefore, the correct grounding method should be used to lead the guiding wire of the cabinet to the grounding copper busbar. Series connection should not be used to avoid the current of different circuits passing through the common ground wire.
2. Reasonable shielding methods
In industrial electrical installation, a 1-D shielding method is often used. Mainly, low-resistance materials such as copper and aluminum are employed to keep the spatial power and magnetic field lines within a 1-D range, thus avoiding electromagnetic interference. Passive shielding, active shielding, overall shielding, local shielding and other methods can be adopted.
3. Overcoming On-site electromagnetic interference
When the inductance coil is connected or disconnected, high voltage will be generated, which will cause electromagnetic interference. Therefore, a capacitive network with appropriate parameters can be connected to the main contact load of the contactor, and a diode can be connected in reverse to the relay.
4. Install additional equipment correctly
In industrial electrical installation, incorrect installation of additional equipment can also cause interference. Therefore, when installing the equipment, it is necessary to install it strictly in accordance with the requirements, carefully read the installation manual, and avoid unnecessary interference.
5. Adopt a stable DC control power supply
Sometimes, using a DC power supply can generate stray inductance, forming a source of interference. Therefore, a stable DC control power supply needs to be used to ensure a large capacity of the DC power supply. When the power supply is incoming, an AC capacitor should be set, and the DC filter capacitor at the output end also needs to be increased.
6. Increase the distance between the two wires
When conducting industrial electrical installations, if the power lines have a small capacity and need to be transmitted over long distances, twisted-pair cables can be used. This can increase the distance between the two wires and thus cancel out the local induced voltages.
The above are several anti-interference measures for industrial electrical installation introduced to you. In addition, methods such as transferring external lead wires and connecting RC networks on relay contacts can also effectively avoid interference.