会社のニュース What is the function of the spd surge dedicated backup protector?

The SPD surge dedicated backup protector, also known as SCB, launched by BRITEC Lightning Protection is a pre-installed protection device at the front end of the surge protector.

According to the lightning protection standards, when installing first and second-level surge protectors, a set of overcurrent protection devices needs to be installed at the front end.

Many customers do not understand why a dedicated SCB backup protector for surges needs to be added. What is the function of this thing?

Based on lightning protection construction experience, BRITEC Lightning Protection believes that the main functions of the spd surge dedicated backup protector are as follows.

We know that when a surge protector is damaged, there are two states: open circuit and short circuit. If it is open circuit, it will not affect the system. However, if a short circuit fault occurs, the phase line will directly conduct to ground through the surge protector, which may cause the following hazards:

• When a surge protector catches fire, after a short circuit, the power frequency current will continue to flow through the SPD. If the short-circuit current is too large, the surge protector will fail to trip. The continuous current will cause the internal component, the varistor, to heat up rapidly until it catches fire and burns.
• Surge protector failure may also cause the main switch to trip, resulting in a power outage of the system. This situation is very serious in places where power cannot be cut off.

If a dedicated surge backup protector is installed, the above two situations can be completely eliminated. When a short-circuit fault occurs, the backup protector can cut off the short-circuit current of 3A to 100kA, ensuring the safety of the surge protector.

Another function is that when the surge protector is damaged, it can cut off the backup protector. At this time, the surge protector will no longer be electrified and can be maintained and replaced normally.

If there is no backup protector, the main power supply can only be cut off or illegal live construction can be carried out, which will cause great inconvenience.

The above two points are the functions of the SPD surge backup protector. Now, do you understand? Regarding how to select a backup protector, you can refer to the previous introduction