Line Surge Arrester, 34.5 KV Line Voltage
A line surge arrester (LSA) is a polymer-housed, metal-oxide surge protection device installed directly on overhead power lines to mitigate lightning-induced and switching overvoltages. It provides localized insulation coordination by limiting transient voltage peaks to a safe level, thereby preventing flashovers, insulator failure, and conductor damage in medium- and high-voltage networks.
Designed for pole-top or cross-arm mounting, line surge arresters are widely deployed in distribution and sub-transmission systems, particularly in lightning-prone or high ground resistance areas. The device operates by transitioning from a high-resistance state under normal system voltage to a low-impedance conduction mode during surge events, clamping the overvoltage and safely diverting surge current to ground.
Key Features
- Metal Oxide Varistor (MOV) Technology—Gapless zinc-oxide blocks provide fast response time and precise voltage clamping without sparkover delay.
- Polymer (Silicone Rubber) Housing—Hydrophobic and UV-resistant insulation ensures high contamination performance and long-term outdoor reliability.
- High Energy Absorption Capability—Engineered to withstand multiple lightning impulses and high surge current ratings (typically 5–20 kA or higher depending on system class).
- Optimized Creepage Distance—Suitable for polluted and coastal environments, enhancing surface leakage resistance.
- Compact and Lightweight Design—Facilitates installation on poles, cross-arms, or directly across insulator strings without significant structural modification.
- Fail-Safe Pressure Relief Mechanism—Integrated disconnector isolates the arrester from the line in case of internal fault, maintaining system safety.
- Wide Voltage Class Range—Available for 5 kV to 69 kV+ applications in distribution and sub-transmission networks.
- Corrosion-Resistant Hardware—Hot-dip galvanized or stainless-steel fittings ensure mechanical durability in harsh field conditions.
Product Details
General
| Application | 35 kV and Below |
| Type | Line Arresters |
Electrical Ratings
| Creep and Leakage Distance | 39.6 in (1005.8 mm) |
| Duty Cycle | 27 kV |
| Frequency Rating | 48-62 Hz |
| MCOV | 22 kV |
| Maximum .5 Microsecond Discharge Volts @ Classifying Current | 91.8 kV |
| Maximum Discharge Voltage | 68.7 kV @ 1.5 kA 73.3 kV @ 3 kA 77.7 kV @ 5 kA 85.4 kV @ 10 kA 96.1 kV @ 20 kA 114.3 kV @ 40 kA |
| Maximum Switching Surge Protective Level @ 500A | 65.9 kV |
| Pressure Relief Capability-Symmetrical rms (kA) | 20 |
| Voltage – Line | 34.5 kV |
Certifications and Compliance
| Industry Standard(s) | IEEE/IEC |
Resources and Downloads
| Specifications | Download PDF |
| Technical Drawings | Download PDF |