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Lightning Surge Arrester for Type 1+2 Protection
Lightning strikes and transient overvoltages pose significant risks to electrical and electronic systems. To safeguard critical infrastructure, Type 1+2 Lightning Surge Arresters are designed to provide comprehensive protection against both direct lightning strikes (Type 1) and induced surges (Type 2). This article explores the technical specifications, working principles, and applications of these advanced surge protection devices.
Understanding Type 1+2 Lightning Surge Arresters
A Type 1+2 Lightning Surge Arrester combines the capabilities of both Type 1 and Type 2 surge protective devices (SPDs) into a single unit. This hybrid design offers several advantages:
- Protection against direct lightning strikes (Type 1)
- Protection against switching transients and induced surges (Type 2)
- Reduced installation space requirements
- Simplified system design
- Cost-effective solution for comprehensive protection
Technical Specifications
Type 1+2 Lightning Surge Arresters typically feature the following technical parameters:
| Parameter | Typical Value |
|---|---|
| Nominal Discharge Current (In) | 20 kA (10/350 μs) |
| Maximum Discharge Current (Imax) | 50-100 kA (8/20 μs) |
| Voltage Protection Level (Up) | 1.5-2.5 kV |
| Response Time | < 100 ns |
| Operating Voltage Range | 120-690 V AC/DC |
| Temperature Range | -40°C to +80°C |
Working Principle
The Type 1+2 arrester employs a multi-stage protection concept:
- Spark Gap Technology: For Type 1 protection, the device uses spark gap technology to handle the high energy of direct lightning strikes (10/350 μs waveform).
- Varistor-Based Protection: For Type 2 protection, metal oxide varistors (MOVs) provide fast response to switching transients and induced surges (8/20 μs waveform).
- Thermal Protection: Integrated thermal disconnectors ensure safe operation and prevent fire hazards in case of device failure.
Key Features
Modern Type 1+2 Lightning Surge Arresters offer several advanced features:
- Visual status indication (green/red indicators)
- Remote signaling contacts for monitoring
- Modular design for easy replacement
- High follow current interruption capability
- Low let-through voltage
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