Use Of Surge Protectors

A surge, also known as a surge, is, as the name suggests, a transient overvoltage that exceeds the normal operating voltage. Essentially, a surge is an intense pulse that occurs in just a few millionths of a second. The possible causes of surge are: heavy equipment, short Circuit, power switching or large engine, products with surge blocking devices can effectively absorb sudden huge energy and protect the connected equipment from damage. Surge protector, also known as lightning arrester, is an electronic device that provides security protection for various electronic equipment, instruments, and communication lines. When there is a sudden peak current or voltage in the circuit or communication line due to external interference, the surge protector can be shunt in a very short time, so as to avoid the damage of the surge to other DC surge protector devices in the circuit.

The hierarchical protection of surge protector (also known as lightning arrester) because the lightning energy is very huge, it is necessary to gradually release the lightning energy to the earth through the hierarchical discharge. The primary lightning arrester can release the huge energy transmitted by direct lightning current or when the transmission line is hit by direct lightning. For places that may be subjected to direct lightning strikes, the first level of lightning protection must be implemented. The second arrester is a protective device against the residual voltage of the previous arrester and the induced lightning strikes in the area. After the energy of the previous lightning strike is absorbed, there is still a portion of the energy that is quite large for the device or the third arrester, and the DC surge protector needs to be further absorbed by the second arrester.

At the same time, the transmission line passing through a lightning protection device will also induce lightning electromagnetic pulse radiation LEMP. When the line is long enough, the induced lightning energy becomes large enough, so the second lightning protection device needs to release further lightning energy. The third lightning protection device protects the LEMP and the remaining lightning energy passing through the second lightning protection device. The length of the connection should be as short as possible. In fact, one of the essence of equipment protection is to make the large voltage of the circuit less than the large withstand voltage of the equipment. The protection level of the surge protector needs to be selected according to the specific protected equipment. One rule to follow is that the wiring length from the ground terminal of the surge protector to its protective circuit breaker (fuse) must not exceed 50 cm, and the feeder of the DC surge protector backup device to be protected must be properly connected to the surge protector terminal and the protective circuit breaker terminal.

The connection of the phase line, neutral line and ground line must be very tight to reduce the surface area of the circuit, and the wiring of the incoming and outgoing lines of the surge protector must be independent of each other to reduce interference to the protected line. The cable must be placed flat on the metal frame of the distribution cabinet to reduce the circulation of the frame and enhance the effect of shielding interference. If the protected load is particularly sensitive to overvoltage, but the distribution box is made of plastic, the plastic distribution box must be replaced with a metal distribution box. In any case, you must check that the metal frame of the PDC is grounded through short connections. Finally, if a shielded cable is used, the ineffective extra cable length must be removed, otherwise the shielding effect will be reduced.