Surge arrester is a device that protects electrical power systems from damages caused by lightning. It diverts the lightning, limits the voltage and protects the equipment installed in parallel.
Surge arresters have many applications, anywhere from protecting a home to a utility substation. They are installed on circuit breakers inside a residential home, inside padmounted transformers, on pole mounted transformers, on pole-mounted riser poles and substations. Surge arrester mainly includes compsite insulators part and plastic base.
 
How does a surge arrester operate?
A metal oxide varistor (MOV) surge arrester contains a series of metal oxide varistor blocks. These MOV blocks are like a voltage-controlled switch, which acts as an insulator with line voltage. Once the voltage the arrester experiences rises above the reference voltage of the arrester, the MOV blocks go into conduction. Since the MOV blocks are highly non-linear, once the voltage drops below the reference voltage, the conduction ends.
Applications:
  • Surge arresters for low, medium and high voltage systems
  • Protection of equipment from power electronics to high energy capacitors, arc furnace transformers and other
  • Surge arresters for AC traction systems
  • Surge arresters for DC traction systems
  • Voltage limiting devices for traction systems