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Our range of high-voltage switchgear for 110–132KV networks is built on decades of engineering refinement and field-proven performance. At the core of the product line is the versatile 126KV SF6 Circuit Breaker, which uses sulfur hexafluoride gas to deliver reliable arc interruption in compact installations. Where open-air insulation and all-weather resilience are priorities, the 126kV Outdoor SF6 Breaker offers outstanding dielectric strength and minimal maintenance cycles. For demanding grid applications that call for enhanced short-circuit ratings and extended mechanical life, the 126KV High Voltage SF6 Circuit Breaker stands out with its robust puffer interrupter design and high first-pole-to-clear capability. A specialized evolution of the platform, the LW36-126 SF6 Circuit Breaker, incorporates advanced arc control features that optimize fault-clearing times and reduce contact erosion, making it a preferred choice for meshed transmission systems. Each of these models shares a common commitment to safety, reliability, and compliance with IEC 62271-100, ensuring seamless integration into modern 110–132KV substations.
The High Voltage Circuit Breaker 110–132KV family is engineered around a dead-tank or live-tank architecture that simplifies installation and accommodates a variety of bushing and current transformer arrangements. SF6 gas serves both as an insulating medium and as an arc-quenching agent, yielding a compact footprint with exceptionally low noise during operation. Spring-spring and hydraulic spring operating mechanisms are available, both tested for over 10,000 close-open cycles to meet class M2 endurance requirements. The breakers are factory-tested for rated short-circuit break currents up to 40 kA and can be supplied with optional grading capacitors for multi-break configurations. Operational reliability is further enhanced by a sealed gas system that maintains leakage below 0.5% per year, even in temperature extremes ranging from -30°C to +50°C.
Every High Voltage Circuit Breaker 110–132KV unit undergoes comprehensive type testing and routine verification. The table below summarizes the key electrical and mechanical parameters that define performance in utility and industrial applications.
| Parameter | Standard Value |
|---|---|
| Rated maximum voltage | 126 / 132 kV |
| Rated frequency | 50 / 60 Hz |
| Rated normal current | 2000 A, 2500 A, 3150 A |
| Rated short-circuit breaking current | 31.5 kA, 40 kA |
| Short-time withstand current (3 s) | 40 kA |
| First-pole-to-clear factor | 1.3 or 1.5 |
| Rated SF6 gas pressure (20°C) | 0.5 – 0.7 MPa |
| Operating mechanism type | Spring-spring / Hydraulic spring |
| Mechanical endurance (class M2) | 10,000 CO operations |
| SF6 leakage rate | < 0.5% per year |
| Ambient temperature range | -30°C to +50°C (standard) |
| Creepage distance (standard/heavy pollution) | ≥ 25 mm/kV |
| Altitude (without derating) | ≤ 1000 m (options for higher) |
Standard features built into every unit include:
In real-world service, High Voltage Circuit Breaker 110–132KV equipment consistently delivers dependable switching for overhead transmission lines, transformer feeders, capacitor banks, and reactor circuits. Its arc interruption system uses a puffer-assist mechanism that limits switching overvoltages and effectively clears both terminal and short-line faults. The mechanical drive is designed for minimal maintenance: only periodic inspections and lubrication are required, and the gas system needs topping up at intervals exceeding 10 years under normal conditions. For digital substation integration, the breaker can be equipped with online monitoring sensors for SF6 density, partial discharge, mechanism travel, and coil current signature, feeding data to SCADA or asset management platforms. This combination of robust construction, modular options, and diagnostic intelligence makes the High Voltage Circuit Breaker 110–132KV series a strategic investment for utilities seeking lifecycle cost efficiency and high availability in transmission networks up to 132 kV.
