Metal 11KV Lightning Arrester Din Rail Mounted For Spd Protection

3 Phase Lightning Arrester Din Rail Mounted IEC Standard For Spd Protection

Features and Principles 
AC gapless metal oxide lightning arrester has excellent nonlinear volt-ampere characteristics, good response characteristics, no renewal current, large through-current capacity, low residual voltage, strong overvoltage suppression capability, dirt resistance, anti-aging, not subject to altitude constraints, simple structure, no gap, tight sealing, long life, etc.
This arrester in the normal system working voltage, showing high resistance state, only microampere current through. It presents low resistance under the action of over-voltage high current, thus limiting the residual voltage at both ends of the arrester

Role
Lightning arrester is connected between the cable and the earth, usually in parallel with the protected equipment. Lightning arrester can effectively protect the communication equipment, once the abnormal voltage, the arrester will occur action, play a protective role. When the communication cable or equipment operating at normal operating voltage, the arrester will not produce the effect of the ground as a break. Once there is a high voltage, and endanger the protected equipment insulation, the arrester immediately act, the high voltage impact current to the earth, thus limiting the voltage amplitude, to protect the communication cable and equipment insulation. When the overvoltage disappears, the arrester quickly restore the original state, so that the normal work of communication lines.
Therefore, the main role of the arrester is through the parallel discharge gap or the role of nonlinear resistance, the invasion of the flow of waves to cut the amplitude, reduce the overvoltage value of the protected equipment, so as to protect the role of communication lines and equipment.
Lightning arrester can be used not only to protect against high voltage generated by lightning, but also to protect against operating high voltage.

Lightning arrester types

The role of lightning arrester is used to protect various electrical equipment in the power system from lightning overvoltage, operating overvoltage, frequency transient overvoltage impact and damage to an electrical appliance. The main types of surge arresters are protection gaps, valve-type surge arresters and zinc oxide surge arresters. Protection gaps are mainly used to limit atmospheric overvoltage, and are generally used for the protection of power distribution systems, lines and substation inlet sections. Valve type arrester and zinc oxide arrester are used for the protection of substation and power plant, and are mainly used to limit atmospheric overvoltage in 500KV and below systems, and will also be used to limit internal overvoltage or for backup protection of internal overvoltage in ultra-high voltage systems.