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Application
Application Fields
Eight Areas We Serve
Every application has different switching duties, duty cycles and environmental conditions. SanGao matches the right device to each one.
Power Transmission & Distribution
Switching and protection equipment for utility networks, from primary substations down to distribution feeders.
Substation & Switchgear
Indoor and outdoor devices for new substations, retrofit projects and prefabricated switchgear assemblies.
Distribution Networks & Ring Main Units
Compact load break switches and earthing switches for ring main units in urban and rural distribution.
Renewable Energy
Solar farms and wind parks need reliable isolation and protection on both the collector and grid side.
Railway & Traction Power
Outdoor switchgear and surge arresters for electrified rail lines, substations and overhead contact systems.
Industrial Plants & Mining
Heavy-duty switching for steel mills, cement plants, chemical works and mining power distribution.
Commercial & Residential
Medium voltage isolation and protection for high-rise buildings, campuses, hospitals and data centres.
Urban Grid Upgrade & Retrofit
Replacing ageing oil and SF6 equipment with modern, compact and environmentally friendlier alternatives.
In Depth
How SanGao Fits Into Your Project
Four typical scenarios, and the equipment combination we recommend for each.
Substation & Switchgear
Scenario 01
Primary Substation & Indoor Switchgear
In a 12–40.5kV substation, the circuit breaker carries the primary switching duty — clearing faults, energizing feeders and supporting busbar transfer. Earthing switches provide the visible safety point before maintenance work begins.
Key requirement: high interrupting capacity, stable mechanical life over
thousands of operations, and a clear, verifiable open position for safety procedures.
Distribution & Ring Main Units
Scenario 02
Distribution Networks & Ring Main Units
Ring main units and secondary distribution cabinets rely on load break switches for normal load switching, and on combined vacuum switch–fuse units for transformer feeder protection. Air-insulated designs are increasingly preferred where SF6 use is restricted.
Key requirement: compact footprint, low maintenance, and a clear
three-position (open / closed / earthed) operation.
Overhead Lines & Outdoor Distribution
Scenario 03
Overhead Lines & Outdoor Distribution
Pole-mounted distribution lines depend on drop-out fuses and cut-outs for transformer protection, and on outdoor vacuum or SF6 breakers where automatic reclosing and remote operation are required. Arresters protect the line against lightning overvoltage.
Key requirement: weatherproof housings, UV and pollution resistance,
and minimal on-site maintenance.
Renewable Energy & Industrial
Scenario 04
Renewable Energy & Heavy Industry
Solar and wind plants need reliable isolation on collector circuits and transformer feeders, often with frequent switching duty. Industrial plants and mining operations require heavy-duty devices that tolerate dust, vibration and high ambient temperature.
Key requirement: high mechanical endurance, stable contact resistance,
and protection coordination across the whole plant.
Application Matrix
Which Equipment for Which Application
A quick reference for engineers specifying SanGao devices.
| Application | Typical Voltage | Recommended Equipment | Installation |
|---|---|---|---|
| Primary Substation | 12–40.5kV | Indoor vacuum circuit breaker, handcart type VCB, earthing switch | Indoor |
| Ring Main Unit | 10–24kV | Load break switch, vacuum LBS + fuse combination, grounding switch | Indoor |
| Overhead Distribution | 10–35kV | Drop-out fuse, cut-out fuse, outdoor boundary VCB, surge arrester | Outdoor |
| Solar & Wind Plant | 12–40.5kV | Disconnector, isolation switch, zinc oxide arrester | Indoor / Outdoor |
| Railway Traction | 27.5kV / 40.5kV | Outdoor vacuum breaker, SF6 breaker, surge arrester | Outdoor |
| Industrial & Mining | 10–35kV | Indoor VCB, load break switch, high speed earthing switch | Indoor |
| Commercial Buildings | 10–24kV | Compact indoor VCB, isolation switch, earthing switch | Indoor |
| Grid Retrofit | 12–40.5kV | Air-insulated LBS, eco-friendly switchgear, compact VCB | Indoor / Outdoor |
Why SanGao
Built for Real Operating Conditions
Four commitments that shape every device we deliver into the field.
01Continuous Self-Improvement
02Enterprise-Wide Innovation
03Surpassing Yesterday's Self
04Never Giving Up
Tell Us About Your Application
Share your project scenario, voltage level and operating conditions — our engineers will recommend the right configuration.
- Selection support based on your actual duty cycle
- Customized solutions for OEM & ODM projects
- Full technical documentation and after-sales support
