High-Voltage Switchgear (12kV - 40.5kV) | Metal-Enclosed Power Distribution Assemblies
High-voltage switchgear controls, protects, and isolates electrical equipment across transmission and distribution networks. Engineered for utility substations, industrial plants, and renewable energy sites, our metal-enclosed switchgear units integrate vacuum circuit breakers (VCBs), SF6 or eco-gas load break switches, and microcomputer-based protection relays into compact modular enclosures.
Each assembly is built in accordance with IEC 62271-200 and IEEE C37.20.2 standards, providing thermal and mechanical protection during short-circuit faults up to 40kA / 3s.
Product Types & Structural Configurations
|
Type |
Insulation Medium |
Enclosure Class |
Primary Applications |
|
KYN28A-12 Air-Insulated Switchgear (AIS) |
Air / Vacuum |
IP4X (Door Closed) / IP2X (Door Open) |
Main distribution substations, industrial power grids, commercial buildings |
|
Gas-Insulated Switchgear (GIS) |
SF6 / Dry Air |
IP67 (Hermetically Sealed Gas Tank) |
Space-constrained urban substations, coastal environments, harsh chemical plants |
|
Solid-Insulated Switchgear (SIS) |
Epoxy Resin / Solid Polymer |
IP67 (High-Voltage Compartment) |
Mining operations, humid climates, eco-restricted urban power networks |
|
Outdoor Ring Main Unit (RMU) |
SF6 / Eco-Gas |
IP54 / IP65 |
Underground cable loops, wind turbine towers, solar photovoltaic collectors |
Technical Specifications
|
Parameter |
12kV Series |
24kV Series |
40.5kV Series |
|
Rated Voltage (kV) |
12 |
24 |
40.5 |
|
Rated Power-Frequency Withstand Voltage (kV/1min) |
42 |
65 |
95 |
|
Rated Lightning Impulse Withstand Voltage (kV) |
75 |
125 |
185 |
|
Rated Current (A) |
630 / 1250 / 2500 / 3150 / 4000 |
630 / 1250 / 2000 / 2500 |
630 / 1250 / 2000 / 2500 |
|
Rated Short-Circuit Breaking Current (kA) |
25 / 31.5 / 40 |
25 / 31.5 |
25 / 31.5 |
|
Rated Short-Circuit Making Current (Peak, kA) |
63 / 80 / 100 |
63 / 80 |
63 / 80 |
|
Rated Short-Time Withstand Current (4s, kA) |
25 / 31.5 / 40 |
25 / 31.5 |
25 / 31.5 |
|
Internal Arc Classification (IAC) |
AFLR 31.5kA 1s |
AFLR 31.5kA 1s |
AFLR 25kA 1s |
|
Enclosure Material |
2.0 mm Al-Zinc (Galvalume) Steel Sheet |
2.0 mm Al-Zinc Steel Sheet |
2.5 mm Powder-Coated Steel Sheet |
|
Mechanical Endurance Class |
M2 (10,000 Operations) |
M2 (10,000 Operations) |
M2 (10,000 Operations) |
Utility Substations: Step-down and primary distribution panels handling grid interconnections up to 40.5kV.
Renewable Energy Plants: Collector switchgear for onshore wind turbine loops and utility-scale solar PV inverter stations.
Heavy Industrial Infrastructure: Power input modules for steel mills, petrochemical facilities, and pulp/paper plants requiring continuous 3150A+ current ratings.
Commercial & Critical Power: Incoming main panels for hyperscale data centers, hospitals, and transport hubs demanding rapid busbar transfer capabilities.
Engineering Customization Options
Primary Component Integration: Select VCBs, contactors, and disconnect switches from ABB (VD4), Siemens (3AH), Schneider (Evolis), or proprietary OEM brands.
Protection & Control Relays: Custom door cutouts and wiring harnesses pre-configured for SEL, DEIF, ABB RELION, or Schneider Sepam protection units.
Busbar Configurations: Tinned copper, silver-plated copper, or aluminum busbar systems engineered for specific thermal rise and fault current levels.
Cabinet Dimensions: Customized panel depth and height parameters to accommodate restricted transformer rooms or containerized mobile substations.
In-House Testing Protocols
Every switchgear cubicle undergoes complete factory acceptance testing (FAT) prior to shipment:
Mechanical Interlock Verification: Functional testing of all mechanical safety interlocks between VCB, earthing switch, and enclosure doors.
Power-Frequency Dielectric Test: High-voltage AC withstand testing up to 95kV across open contacts and line-to-earth gaps.
Primary Current Injection Test: Temperature rise and contact resistance measurements across all busbar joints.
Helium Leak Detection (GIS Units): Vacuum chamber testing verifying gas enclosure leakage rates stay below 0.1% per year.
Compliance Standards
IEC 62271-200 / IEC 62271-100: High-voltage switchgear and controlgear standards.
ISO 9001:2015: Quality management system covering design, sheet metal fabrication, assembly, and testing.
ISO 14001 / ISO 45001: Environmental and occupational health safety systems.
Packaging, Delivery & Lead Times
Structural Packaging
Steel-framed wooden crates with internal vacuum-sealed vapor barrier foil and desiccant bags to prevent moisture damage during ocean transit.
Assembly State
Shipped as fully assembled panels or modular shipping splits for field busbar splicing.
Standard Production Lead Time
4 To 6 weeks following final engineering drawing sign-off (SLD approval).
As one of the most experienced high-voltage switchgear manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality high-voltage switchgear from our factory. If you have any enquiry about pricelist, please feel free to email us.
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