China RMU Unit Manufacturer & Supplier

Gas-Insulated Switchgear (GIS) encapsulates primary conductors and switches inside a stainless steel tank filled with SF6 (or pressurized dry air), leveraging the gas's exceptional dielectric strength and arc-quenching properties. Solid-Insulated Switchgear (SIS) eliminates insulating gases entirely by molding conductors and vacuum interrupters in solid epoxy resin wrapped in an outer grounding shield. While GIS remains the time-tested standard for compactness at 24kV/36kV, SIS offers an environmentally neutral footprint with zero gas leakage risks, zero pressure-vessel monitoring requirements, and exceptional resilience in flooded or mining conditions.

Every stainless steel tank is fabricated from 3.0mm surgical-grade 304 or 316L stainless steel using automated robotic laser welding to prevent micro-fissures. Post-welding, 100% of manufactured tanks undergo helium vacuum chamber mass spectrometry leak detection. This protocol detects micro-leaks below 1x10^-8 mbar·L/s, guaranteeing an annualized leakage rate below 0.1% per year across the 30+ year service life, well within IEC 62271-200 criteria.

SMC is a thermoset composite made of unsaturated polyester resin reinforced with chopped glass fibers, molded under extreme heat and hydraulic pressures (up to 2000 tons). Unlike thermoplastics like ABS or polycarbonate, SMC does not melt, creep, or deform when exposed to electrical flashover or high temperatures (heat deflection temperature exceeds 200°C). It delivers UL94-V0 flame retardancy, exceptional UV stabilization that prevents outdoor micro-cracking, and provides superior mechanical impact protection (rated IK10).

Yes. Our ODM/OEM engineering team routinely adapts switchgear configurations to national grid standards across the Middle East, Southeast Asia, Africa, Europe, and the Americas. Customizations include modular bay layouts (CCF, CCC, CCVV, etc.), motorized operating mechanisms (24VDC, 48VDC, 110V/220VDC/AC), electronic current/voltage sensors (EVTs/ECTs), integrated CT metering cubicles, specific bushing tapers (such as EN 50181 Type C 630A bolted or Type A 200A plug-in), and regional multi-point mechanical key interlocking schemes.

We supply comprehensive type-test certificates issued by accredited third-party high-voltage test laboratories. Available documentation includes Short-Time Withstand Current (STW up to 25kA/3s), Internal Arc Classification (IAC AFLR 20kA/1s), Lightning Impulse (BIL) up to 125kV, Mechanical Endurance (M2 class 10,000 operations), Ingress Protection (IP67 tank, IP4X/IP54 enclosure), and Salt Spray Aging Reports. Every delivered batch is accompanied by standard routine test certificates, including power-frequency dielectric withstand, partial discharge, contact resistance, and gas moisture concentration reports.

Standard modular configurations are typically manufactured within 3 to 4 weeks, while large-scale utility tender volumes (100+ bays) follow structured delivery schedules of 6 to 8 weeks. For international ocean freight, all switchgear tanks and metering enclosures are vacuum-sealed with moisture-absorbing desiccant packets, wrapped in anti-static protective film, cushioned with dense shock-absorbent corner guards, and enclosed in heavy-duty fumigated wooden crates compliant with ISPM 15 standards.