Solid Insulated Switchgear: The Sustainable Future of Medium Voltage Distribution

 


Solid Insulated Switchgear: A Smarter, Safer, and Greener Future for Power Distribution

The transition toward sustainable and high-efficiency power systems is accelerating across the globe. As the demand for renewable energy, distributed generation, and intelligent grid networks rises, medium-voltage switchgear plays a crucial role in ensuring safe and reliable energy delivery.

Traditionally, gas-insulated switchgear (GIS) using SF₆ gas has dominated the market due to its compact design and strong insulation performance. However, the environmental risks of SF₆—one of the most potent greenhouse gases known—are forcing utilities and industries to adopt new technologies. This is where Solid Insulated Switchgear (SIS) becomes a leading innovation, eliminating SF₆ emissions completely.

Degatech Electric Co., Ltd. (https://chinadegatech.com/) proudly offers advanced SIS solutions engineered for modern electrical networks. Our systems support the growing need for environmental compliance, optimized performance, and improved operational safety.

What Is Solid Insulated Switchgear?

Solid Insulated Switchgear is a medium-voltage switchgear that uses solid dielectric materials instead of greenhouse gases for insulation. All live components are fully encapsulated within epoxy resin or other solid insulation material, creating a sealed system that protects the switchgear from moisture, dust, pollution, and chemical corrosion.

Typical voltage rating: 12–40.5kV
Primary functions:

  • Control electric power flow

  • Protect power systems from faults

  • Isolate faulty sections for safe maintenance

The technology was developed to resolve issues faced by AIS (Air-Insulated Switchgear) and SF₆-GIS, offering both environmental advantages and improved reliability.

Key Advantages of Solid Insulated Switchgear

✔ Environmentally Friendly

  • No toxic gases

  • Zero greenhouse gas emissions

  • Fully compliant with EU & international sustainability standards

  • Safe disposal and recycling with minimal environmental impact

✔ Enhanced Personnel Safety

  • Touch-proof structure

  • Arc-resistant design

  • No risk from gas leakage or pressure accumulation

✔ Compact & Modular

  • Smaller footprint than AIS

  • Flexible installation options

  • Easier future upgrading and system expansion

✔ Superior Reliability & Long Lifecycle

  • Sealed insulation prevents dust, salt, humidity penetration

  • Withstands harsh climates and industrial environments

  • Fewer components → reduced failure possibilities

✔ Reduced Routine Maintenance Costs

  • No refilling or gas handling

  • Factory-sealed structure

  • Minimal ongoing inspection requirements

SIS vs SF₆ GIS vs AIS (Comparison Table)

FeatureSISSF₆-GISAIS
InsulationSolid MaterialSF₆ GasAir
Environmental ImpactExcellentPoorGood
MaintenanceLowMedium-HighMedium
SafetyVery HighMediumMedium
SizeCompactVery CompactLarge
Arc ProtectionStrongStrongModerate
CostModerateHighLow

✔ SIS provides the best balance of performance, safety, and environmental compliance.

Internal Structure and Components

Solid Insulated Switchgear includes:

  • Vacuum circuit breakers

  • Solid-insulated busbars

  • Integrated current & voltage sensors

  • Earthing switches

  • Control protection relays

  • Mechanical interlock systems

All conductors and switches are packaged into a sealed cabinet, forming a maintenance-free system.

Applications of Solid Insulated Switchgear

SIS is suitable for:

  • Urban distribution substations

  • Light rail & metro transportation

  • Wind and solar energy networks

  • Oil and gas facilities

  • Data centers

  • Underground substations

  • Sensitive & enclosed environments

Where space, safety, and environmental requirements are critical—SIS is the ideal choice.

Compliance with Global Standards

Degatech SIS solutions comply with:

  • IEC 62271 series

  • ISO environmental management standards

  • Local utility certification requirements

We ensure compatibility with modern SCADA and smart-grid connectivity options.

Why Choose Degatech Solid Insulated Switchgear?

Degatech combines advanced engineering with reliable craftsmanship, offering benefits including:

✅ Full Customization Ability

Tailored ratings, cabinet configurations, protection relays, and smart grid connectivity.

✅ Robust Quality Control

Every switchgear undergoes:

  • Partial discharge test

  • Thermal and dielectric strength verification

  • Mechanical endurance cycles

✅ Full Project Support

From consultation to installation and after-sales service:

  • Detailed documentation

  • Remote and on-site assistance

  • Spare part support and upgrades

Future Outlook: Solid Insulation Leads the Market

Market analysts forecast SIS adoption will grow over 15% annually due to:

  • SF₆ ban coming into effect in Europe and other regions

  • Increased demand for renewable integration

  • Expansion of smart microgrids

  • Urban space constraints

SIS is becoming a standard technology for new infrastructure investment.

Contact Degatech for SIS Solutions

If your project requires medium-voltage equipment that delivers safety, performance, and sustainability, our engineering team is ready to support you.

Learn more at: https://chinadegatech.com/
📌 (Website included second time)

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