SURGE & LIGHTNING PROTECTION
Surge Protection
Surge Protection and Lightning Arrestors
Surge protection devices (SPDs) protect electrical and electronic equipment from voltage spikes caused by lightning, switching operations, or grid disturbances. They safely divert excess voltage to the ground, preventing damage to sensitive systems and improving reliability.
Surge Protection Devices (SPDs):
- Type 1 SPD – Protects against direct lightning surges (installed at service entrance)
- Type 2 SPD – Protects against switching and indirect lightning surges (distribution boards)
- Type 3 SPD – Protects sensitive equipment (point-of-use protection)
- AC SPDs – For AC power lines
- DC SPDs – For solar PV and DC systems
Types of Lightning Arrestors
- Rod (Franklin) Type – Simple air terminal mounted on rooftops
- Early Streamer Emission (ESE) Type – Provides wider protection radius
- Mesh / Faraday Cage Type – Network of conductors covering the structure
- Valve Type – Used in power systems and substations