How is a Surge Protector Grounded?

As we all know, the impact and damage of thunderstorms and lightning on us is very huge, so it is also very important to take corresponding lightning protection measures for various power supply electrical equipment. With the continuous progress of modern lightning protection technology, lightning protection products are constantly being introduced. As a professional lightning protection device, SPD surge protector has attracted the attention of many users in recent years.

1. SPD surge protector is a kind of safety protection electronic equipment

SPD surge protector, also called lightning protector, is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. When the electrical circuit or communication line suddenly generates a peak current or voltage due to external interference, the SPD surge protector can turn on the shunt in a very short time, thereby avoiding the damage of the surge to other equipment in the circuit. It is suitable for surge protection requirements in family residences, tertiary industries and industrial fields.

However, in thunderstorm weather, to protect electronic equipment, it is not enough to only install a surge protector. What is more important is to standardize the grounding of the outdoor surge protector, because the SPD surge protector will generate a strong induced current during lightning strikes. When it becomes a conductor, it will lead the induced current into the earth. So if there is no grounding system grounding wire or no standardized grounding, the surge protector will lose its effect.

2. Installation and grounding method of SPD surge protector specification

First of all, it is necessary to carefully survey the site conditions, and after careful planning, according to the size of the equipment and the position of the incoming line of the power strip, plan out enough space and arrange the position accordingly. All levels of SPD surge protectors for power lines should be installed at the entrance of the line into the building, the interface of the lightning protection zone and close to the protected equipment. During the installation process, the power should be cut off to prevent electric shock accidents.

The installation of the power surge protector is mainly to discharge a large number of lightning strikes and surge currents and limit the surge voltage. Because the surge current is very large, the nominal discharge current and maximum discharge current of the SPD are also very large, so the cross-sectional area of the upper and lower leads should have a certain size. Depending on the number of SPD series, the requirements for the cross-sectional area of the wire are also different. Generally speaking, the SPD grounding terminal of the signal line surge protector should be connected to the local equipotential grounding terminal board in the equipment room with a copper core wire with a cross-sectional area of not less than 4㎟, which can reduce the lead inductance, thereby reducing its dynamic impedance, and also reduces the residual voltage of the line.

In addition, according to the technical specification for lightning protection of building electronic information systems, the installation of SPD surge protectors for signal lines should meet the following requirements: The SPD for signal line surge protectors should be connected to the signal port of the protected equipment. The SPD output terminal of the surge protector is connected to the port of the protected equipment. It can be seen that the surge protector has high technical requirements for installation and grounding. Only when the installation meets professional regulations and standards can the surge protector play its best role.

The products of Shenzhen Techwin Lightning Technologies Co., Ltd are widely used in communications, electric power, finance, railways, transportation, petrochemicals, security monitoring, meteorology, photovoltaics, wind power new energy and other industries. Welcome to consult our products online!