A lightning arrester (also called a surge arrester) is a protective device used in electrical systems to divert high-voltage lightning surges safely to the ground, preventing damage to equipment, buildings, and power systems.
⚡ What is a Lightning Arrester?
A lightning arrester is installed between the line and earth. When a lightning surge occurs, it provides a low-resistance path for the surge current to flow into the ground, protecting transformers, panels, and electrical devices.
⚙️ How It Works
- Under normal conditions → acts as an insulator
- During lightning/surge → becomes conductive
- Diverts surge current to earth → restores normal condition
🔧 Types of Lightning Arresters
1. Rod Gap Arrester
- Simplest type
- Used in overhead transmission lines
- Low cost but less reliable
2. Horn Gap Arrester
- Uses two horn-shaped electrodes
- Arc rises upward and extinguishes automatically
- Common in substations
3. Valve Type Arrester
6
- Uses nonlinear resistors
- High efficiency and reliability
- Widely used in power systems
4. Metal Oxide Arrester (MOA)
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- Most advanced type (ZnO based)
- No spark gaps required
- Fast response and high protection level
🏢 Where Lightning Arresters Are Used
- Power transmission & distribution systems
- Industrial plants (factories, refineries)
- Telecom towers
- Residential & commercial buildings
- Solar power plants
🔒 Importance of Lightning Protection
- Prevents equipment damage
- Reduces fire risk
- Ensures system reliability
- Protects human life
📊 As per Standards
Lightning protection systems are designed according to:
- IEC 62305
- IS/IEC 62305
💡 Pro Tip (for Your Business – SN Engineering)
If you're working in lightning protection:
- Focus on ESE lightning arresters + chemical earthing combo
- Target industries in Gurgaon, Manesar, Delhi NCR
- Offer complete solution (Design + Supply + Installation + Testing)
- Follow IEC standards to win corporate tenders
