Surge protectors, also known as surge protectors, are electronic devices that provide security protection for various electronic devices, instrumentation, and communication lines. When a sudden current or voltage is suddenly generated in the electrical circuit or communication line due to external interference, the surge protector can conduct the shunt in a very short time, thereby avoiding the damage of the surge to other equipment in the circuit.
In order to prevent the damage caused by overvoltage to the equipment, we can install surge protectors to protect them, which can be divided into power line protection, signal line protection and antenna feeder protection.
The power line surge protector (SPD) installation should meet the following requirements:
1. Surge protection devices (SPDs) at all levels of the power supply line should be installed at the front end of the power line of the protected equipment, and the terminals of the SPD should be connected with the same name of the line of the distribution box. The ground of the surge protector is connected to the protective earth (PE) grounding terminal board of the distribution box. The grounding terminal board of the distribution box should be connected to the equipotential grounding terminal board of the lightning protection area. The surge protection device (SPD) connection conductors at all levels should be straight and their length should not exceed 0.5m.
2. Power line surge protectors with terminal blocks should be crimped; surge protectors with terminal pins should be connected using wire nose and terminal posts.
3. The minimum cross-sectional area of ​​the SPD connecting wires should meet the requirements in the following table.
Protection type SPD type Wire cross-sectional area (mm2)
SPD connection phase conductor copper conductor SPD ground connection copper conductor first stage switch type or pressure limiting type 1625
The second stage pressure limiting type 1016
Third-level pressure-limiting 610
Fourth-level pressure limit 46
The installation of the SPD shall comply with the following provisions:
1. The surge protector SPD of the antenna feeder should be connected in series between the antenna feeder and the protected equipment. It should be installed near the equipment in the equipment room or on the rack, or it can be directly connected to the equipment feeder interface.
2. The ground of the SPD SPD should be connected to the direct lightning protection zone (LPZ0A) or direct lightning protection zone (LPZ0B) and the first protection zone (LPZ1) using copper conductors with a cross-sectional area of ​​not less than 6mm2. At the junction of the equipotential grounding terminal board, the grounding wire should be straight.
The installation of a signal line surge protector (SPD) shall meet the following requirements:
1. The signal line surge protector SPD should be connected to the signal port of the protected device. The SPD output of the surge protector is connected to the port of the protected device. The surge protector SPD can also be installed in the cabinet and fixed on the equipment rack or near the support.
2. The SPD ground of the signal line surge protector should be connected with the local equipotential grounding terminal board in the equipment room with a copper conductor with a cross-sectional area of ​​not less than 1.5mm2. The grounding cable should be straight. Surge protector SPD should be firmly installed and its location and wiring are correct.
In order to prevent the damage caused by overvoltage to the equipment, we can install surge protectors to protect them, which can be divided into power line protection, signal line protection and antenna feeder protection.
The power line surge protector (SPD) installation should meet the following requirements:
1. Surge protection devices (SPDs) at all levels of the power supply line should be installed at the front end of the power line of the protected equipment, and the terminals of the SPD should be connected with the same name of the line of the distribution box. The ground of the surge protector is connected to the protective earth (PE) grounding terminal board of the distribution box. The grounding terminal board of the distribution box should be connected to the equipotential grounding terminal board of the lightning protection area. The surge protection device (SPD) connection conductors at all levels should be straight and their length should not exceed 0.5m.
2. Power line surge protectors with terminal blocks should be crimped; surge protectors with terminal pins should be connected using wire nose and terminal posts.
3. The minimum cross-sectional area of ​​the SPD connecting wires should meet the requirements in the following table.
Protection type SPD type Wire cross-sectional area (mm2)
SPD connection phase conductor copper conductor SPD ground connection copper conductor first stage switch type or pressure limiting type 1625
The second stage pressure limiting type 1016
Third-level pressure-limiting 610
Fourth-level pressure limit 46
The installation of the SPD shall comply with the following provisions:
1. The surge protector SPD of the antenna feeder should be connected in series between the antenna feeder and the protected equipment. It should be installed near the equipment in the equipment room or on the rack, or it can be directly connected to the equipment feeder interface.
2. The ground of the SPD SPD should be connected to the direct lightning protection zone (LPZ0A) or direct lightning protection zone (LPZ0B) and the first protection zone (LPZ1) using copper conductors with a cross-sectional area of ​​not less than 6mm2. At the junction of the equipotential grounding terminal board, the grounding wire should be straight.
The installation of a signal line surge protector (SPD) shall meet the following requirements:
1. The signal line surge protector SPD should be connected to the signal port of the protected device. The SPD output of the surge protector is connected to the port of the protected device. The surge protector SPD can also be installed in the cabinet and fixed on the equipment rack or near the support.
2. The SPD ground of the signal line surge protector should be connected with the local equipotential grounding terminal board in the equipment room with a copper conductor with a cross-sectional area of ​​not less than 1.5mm2. The grounding cable should be straight. Surge protector SPD should be firmly installed and its location and wiring are correct.
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