Power supply lightning protector (SPD), also known as lightning
arrester, surge protector, surge protector. In the information age,
computer networks and communications equipment is increasingly
sophisticated, the requirements of its working environment is also
increasingly high, and lightning and large electrical equipment
transient overvoltage will be more and more frequent through the
power supply, antennas, radio signal transceiver equipment and
other lines into the indoor electrical equipment and network
equipment, resulting in equipment or component damage, casualties,
transmission or storage data interference or loss, and even make
electronic equipment malfunction or temporary paralysis, system
stoppage, data transmission interruption, LAN or even WAN damage.
The damage is alarming, and the indirect loss is generally much
larger than the direct economic loss. Power supply lightning
protector is to prevent equipment from being struck by lightning
through modern electricity and other technologies.
Development history Editorial voice
The most primitive lightning arrester is ram-horn shaped gap,
appeared in the late 19th century, used for overhead transmission
lines, to prevent lightning damage to equipment insulation caused
by blackouts, so called "lightning arrester". 1920s, aluminum
lightning arrester, oxide film arrester and pill arrester appeared.
30s appeared tubular lightning arrester. 50s appeared silicon
carbide lightning arrester. 70s appeared metal oxide lightning
arrester In the 1970s, metal oxide lightning arrester appeared.
1992 onwards, the industrial control standard 35mm rail snap-in
pluggable SPD lightning protection module, represented by Germany
and France, began to be introduced into China on a large scale, and
later the integrated box power lightning protection combination,
represented by the United States and the United Kingdom, also
entered China.
Principle
There are two types of power surge protector: the explosion-proof
box type and the modular type. Both use voltage-sensitive resistors
with excellent non-linear characteristics. Under normal conditions,
the surge protector is in a very high resistance state and the
leakage current is almost zero, thus ensuring normal power supply
to the power system. When a surge overvoltage occurs in the power
system, the power surge protector immediately conducts within
nanoseconds, limiting the amplitude of the overvoltage to the safe
working range of the equipment, while the surge energy is channeled
into the ground and released. The surge protector then rapidly
changes to a high resistance state again, thus not affecting the
normal power supply.
Performance features
1. large protection flux, very low residual voltage, fast response
time
2. the latest arc extinguishing technology, completely avoiding the
occurrence of fire
3. Adopt temperature control protection circuit, built-in thermal
protection
4. with power status indication, showing the working status of the
surge protector
5. Rigorous structure, stable and reliable operation [1].
