Explore Rockwill’s project highlights across smart grids, EV charging networks, and power distribution. See how our reclosers, switchgear, transformers, and prefabricated substations deliver reliable performance worldwide.

Rockwill Dead Tank Circuit Breakers have been successfully put into operation under extreme cold and strong sandstorm conditions.

Rockwill 03/03/2026

High‑voltage dead‑tank circuit breakers serve as core assets for large‑scale power grid interconnection.Extreme cold and heavy sandstorms impose severe tests on equipment mechanical and insulating performance.

Project Overview

Deployed in the 330kV Geermu substation upgrade (Qinghai, China), the RMR-363 SF6 circuit breaker overcame extreme cold (-35°C) and severe sandstorm conditions. Featuring a single-break puffer-type arc chamber (63kA breaking), dual-main/dual-standby intelligent heating, and disc spring hydraulic mechanism, it achieved zero-failure operation, securing critical power supply for the Qinghai-Tibet Grid Interconnection Project.

Rockwill Dead Tank Circuit Breakers have been successfully put into operation under extreme cold and strong sandstorm conditions.

Engineered for Excellence & Durability

Single-break puffer-type arc extinguishing chamber delivers 63kA breaking / 5000A rated current. Disc spring hydraulic mechanism ensures precise single-phase or three-phase electrical interlocking operation with 10,000-cycle mechanical life. Intelligent heating (standard or dual-main/dual-standby) enables reliable operation down to -45°C. Current transformer adopts wound-core electromagnetic design with coil in air environment and triple-protection housing (waterproof, sand-proof, foreign-object resistant), guaranteeing stable secondary output in harsh conditions.

Driving Infrastructure Forward

As a benchmark for environmental adaptability in domestic high-voltage equipment, the RMR-363 is widely deployed across China’s northwest and northeast cold/sandy regions and supports "Belt and Road" projects in similar climates. Committed to "technology + scenario" innovation, we deliver resilient, intelligent solutions to advance global grid safety, sustainability, and digital transformation.

Deployed Equipment

Dead Tank SF6 circuit breaker supplier-363kV

Pioneers in China's Dead Tank SF6 Circuit Breaker industry. As the country's first source factory specializing in this field, we boast decades of technical accumulation and continuous innovation — ensuring reliable products while leading the way in R&D. Thanks to our outstanding reliability, we've been chosen for numerous major power projects.Main FeaturesHigh Voltage Rating Adaptability: Specifically designed for 363 kV extra-high voltage systems, it stably handles high voltages and large c

Rockwill

Leave your contact information to receive the full technical white paper, equipment list, and energy efficiency report for this case. Request Reference Materials

Recent Success Reference