Integrated Medium & Low Voltage Distribution Systems
Engineered to international IEC and ANSI/IEEE standards by premier manufacturing lines in Yueqing, China.
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View SpecificationsSolid-Insulated Switchgear (SIS): Architectural Revolution in Medium-Voltage
Overcoming the limitations of traditional air-insulated (AIS) and SF6 gas-insulated (GIS) switchgear through advanced polymer casting and vacuum interrupter engineering.
Zero SF6 Gas Dependence
Solid-insulated switchgear replaces sulfur hexafluoride (SF6)—a potent greenhouse gas with a Global Warming Potential (GWP) 24,300 times higher than CO2—with high-dielectric epoxy resin encapsulations. This ensures total immunity to escalating regulatory levies, F-gas quotas, and complex gas leakage monitoring frameworks.
Full Phase Isolation & APG Casting
Utilizing state-of-the-art Automatic Pressure Gelation (APG) epoxy casting, each phase conductor, vacuum interrupter, and three-position disconnector is embedded into an independent solid insulation envelope. This modular isolation renders internal phase-to-phase short circuit flashovers virtually impossible under standard operating conditions.
Environmental Invariance (IP67)
The completely sealed solid-dielectric architecture operates unaffected by harsh external ambient conditions. It mitigates insulation degradation caused by high humidity, coastal salt-mist corrosion, chemical contaminants, high altitude derating, and seasonal flooding, sustaining a Partial Discharge (PD) level below 5 pC at 1.1x nominal voltage.
SF6 Greenhouse Gas Emitted Across 30+ Year Lifecycle
Factory Routine Partial Discharge at 1.1x Nominal Voltage
Mechanical Operations (M2 Class Vacuum Interrupters)
Footprint Reduction vs. Conventional Air-Insulated Cabinets
| Evaluation Parameter | Solid-Insulated Switchgear (SIS / GXGN-12) | SF6 Gas-Insulated (GIS / RM6 / SafeRing) | Air-Insulated Switchgear (AIS / KYN28) |
|---|---|---|---|
| Dielectric Medium | Epoxy Resin (APG) + Silicone | Sulfur Hexafluoride Gas (SF6) | Atmospheric Air + Phase Barriers |
| Global Warming Potential (GWP) | 0 (Eco-Friendly / Net-Zero Aligned) | 24,300 (Subject to Phase-out & Taxes) | 0 |
| Phase Separation | Complete Solid Single-Phase Segregation | Common Gas Tank / Compartmentalized | Air Gap Separation (Phase-to-Phase Risk) |
| Substation Space Requirement | Ultra-Compact (Width: 350mm–420mm) | Compact (Width: 325mm–400mm) | Large (Width: 800mm–1000mm) |
| Internal Arc Resistance | IAC AFLR up to 25kA 1s | IAC AFLR up to 20kA 1s | IAC AFLR up to 31.5kA 1s |
| Lifecycle Maintenance | Maintenance-Free Primary Circuit | Periodic Gas Pressure & Density Checks | Regular Dusting, Greasing & Verification |
Why Yueqing Represents the Apex of China's Switchgear Supply Chain
Accelerating global procurement through end-to-end vertical integration, automated precision manufacturing, and rigorous quality certification frameworks.
Vertical Component Integration
Yueqing (Wenzhou) serves as China's global capital for low- and medium-voltage engineering. Our factory ecosystem integrates pure copper busbar extrusion, precision sheet metal laser fabrication (2mm alu-zinc plated sheets), automated vacuum interrupter production lines, and APG epoxy injection presses within an immediate 15km industrial radius.
Radical Lead Time Reductions
While Western switchgear manufacturers regularly quote 26 to 48 weeks for medium-voltage configurations, our tightly coupled Chinese supply network delivers custom-engineered solid-insulated switchgear within 4 to 8 weeks. Rapid engineering turnaround for Single-Line Diagrams (SLD) and CAD submittals accelerates overall EPC project lifecycles.
Certified Testing & Routine Verification
Every solid-insulated cubicle leaves our Yueqing facility subjected to 100% automated routine testing. Testing protocols include Power Frequency Withstand Voltage (42kV/1min), Lightning Impulse Withstand (BIL 75kV/95kV), mechanical timing characteristics, main loop resistance, and advanced Partial Discharge screening below 5pC in shielded test chambers.
Engineering Standards & Regulatory Alignment for Global EPCs
Bridging Chinese manufacturing velocity with stringent international grid compliance and decarbonization mandates.
IEC 62271-200 Standard Compliance
Designed, assembled, and validated in strict conformity with IEC 62271-200, IEC 62271-100 (circuit breakers), and IEC 62271-102 (disconnectors). The equipment guarantees Loss of Service Continuity Class LSC2B, Partition Class PM (metallic partition between cable and busbar compartments), and certified Internal Arc Classification (IAC AFLR).
European Union F-Gas Ban Preparedness
With the EU 2024/573 revised F-gas regulations banning SF6 in new medium-voltage electrical installations up to 24 kV by 2026 and up to 40.5 kV by 2030, Chinese solid-insulated systems offer turnkey, direct-fit drop-in alternatives. This eliminates greenhouse gas reporting overheads and avoids costly decommissioning procedures.
SCADA & Substation Digital Twins
Modern international buyers demand native digital capabilities. Chinese SIS equipment comes equipped with advanced intelligent electronic devices (IEDs), optical fiber busbar temperature sensing, non-invasive partial discharge transducers, and dual Ethernet ports supporting IEC 61850 MMS and GOOSE protocols for smart grid integration.
Mission-Critical Application Scenarios for Solid-Insulated Switchgear
Purpose-engineered to thrive where conventional air-insulated and gas-insulated equipment face accelerated degradation or installation constraints.
Underground Mining & Rail Transit
Subterranean mining shafts and metro tunnels present high dust concentration, coal particulates, damp ambient air, and elevated vibration. The solid resin-encapsulated switching assembly prevents flashovers across creepage surfaces, functioning as an explosion-proof, dust-tight medium-voltage node requiring negligible routine maintenance.
Offshore Wind & Coastal Substations
Operating in maritime environments with severe salt-mist salinity and relative humidity up to 98% leads to rapid oxidation of internal linkages in traditional AIS switchgear. Solid insulation physically seals primary conductor lines, while high-grade stainless steel exterior enclosures provide C4/C5 marine atmospheric corrosion resilience.
High-Altitude Plateaus (>3,000m)
Thin air at high elevations drastically impairs air dielectric strength, forcing massive size derating on AIS equipment. Solid-insulated switchgear relies on an invariant solid dielectric barrier, making electrical insulation properties totally independent of atmospheric pressure drops, ideal for mountainous renewable energy plants.
Hyperscale Data Centers
Modern tier-3 and tier-4 data centers demand zero downtime and eliminate indoor gas asphyxiation hazards associated with pressurized SF6 tanks in basement distribution galleries. Solid-insulated modular units provide compact footprints, high MTBF, and fast plug-and-play feeder expansion for uninterrupted compute uptime.
Utility Solar Step-Up Substations
Combined with outdoor prefabricated substations (European or American compact styles), solid-insulated switchgear handles dynamic switching cycles, inverter harmonics, and severe diurnal temperature oscillations without gas pressure fluctuation alarms or dielectric degradation.
High-Performance Switching, Protection & Transformer Solutions
Comprehensive secondary distribution, circuit protection, and power conversion equipment engineered for industrial dependability.
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View SpecificationsFrequently Asked Questions on Solid-Insulated Switchgear Procurement
Comprehensive engineering and commercial clarifications based on common international utility and EPC inquiries.
What fundamental advantages does Solid-Insulated Switchgear (SIS) provide over traditional SF6 GIS?
Solid-insulated switchgear utilizes solid epoxy resin and silicone rubber insulation to completely encapsulate the high-voltage conductor paths and vacuum interrupters, eliminating the use of sulfur hexafluoride (SF6) gas. This guarantees zero greenhouse gas leakage risks, zero O&M costs for gas pressure monitoring, and immunity from international F-gas tax liabilities and bans. Additionally, SIS eliminates the risk of catastrophic gas-loss insulation failures and toxic byproduct generation (e.g., SO2, HF) after internal arcing.
How does China's Yueqing manufacturing ecosystem ensure product quality and lead time superiority?
Yueqing houses China's largest electrical equipment manufacturing cluster, providing a completely integrated supply chain within a 15km perimeter. Raw materials, precision laser tooling, automated vacuum interrupter production, silicone bushings, and high-precision CNC copper machining are sourced without logistics delays. This enables lead times of 4 to 8 weeks for custom-configured switchgear versus 24 to 48 weeks from Western manufacturers, backed by ISO 9001, ISO 14001, and ISO 45001 certified quality control systems.
What specific type tests and routine tests validate our Solid-Insulated Switchgear?
Our products undergo full type-testing by accredited national high-voltage testing laboratories (such as XIHARI or CEPRI) in accordance with IEC 62271-200, IEC 62271-100, and IEC 62271-102. Type tests include short-time withstand current (up to 25kA/4s), peak withstand current, internal arc classification (IAC AFLR 20kA/25kA 1s), temperature rise at rated current, and mechanical endurance (Class M2 - 10,000 cycles). Routine tests on every outgoing panel include power frequency voltage withstand, main loop contact resistance, and partial discharge screening below 5pC.
How is thermal dissipation managed in completely solid-insulated modules?
Thermal dissipation in solid-insulated modules is engineered through finite element method (FEM) thermal simulation and proprietary composite heat-conductive epoxy resins. Silver-plated primary contacts reduce thermal generation at connection points, while multi-surface external dissipation fins on the outer phase casings maximize natural convection cooling within ventilated enclosures, keeping temperature rises well below the limits set by IEC 62271-1 (65K for terminals).
Can Chinese solid-insulated ring main units be seamlessly integrated into existing SCADA networks?
Yes. Our solid-insulated switchgear incorporates standard intelligent electronic devices (IEDs) supporting Modbus-RTU, DNP3, and IEC 61850 protocols. Auxiliary motorized mechanisms for disconnectors and vacuum circuit breakers, alongside integrated micro-switches, optical fiber temperature sensors, and capacitive voltage indicators (VPIS), enable end-to-end telemetry, remote control, and real-time health diagnostics via substation automation systems.
What engineering submittals are provided to overseas EPC contractors during project bidding?
Overseas EPC contractors receive an engineering package including: Single-Line Diagrams (SLD), general arrangement and footprint drawings (CAD and BIM Revit formats), schematic secondary control circuit diagrams, busbar sizing and calculation sheets, comprehensive type-test reports from certified independent laboratories, and complete Operation & Maintenance (O&M) instruction manuals in English.