Application of Epoxy sheet in Gas-Insulated Switchgear (C-GIS) Gas-insulated switchgear (C-GIS) is widely used in me...
Gas-insulated switchgear (C-GIS) is widely used in medium- and high-voltage power distribution systems due to its compact size, reliable operation, and easy maintenance. High-performance insulation materials are essential for components such as circuit breakers, isolators, busbars, and operating mechanisms inside the cabinet. Epoxy sheets (e.g., FR4, G10, G11, EPGC series) are core materials due to their excellent properties.
| Feature | Description |
|---|---|
| High Electrical Insulation | High dielectric strength (≥18–25 kV/mm) and arc resistance ensure phase-to-phase and phase-to-ground insulation. |
| Excellent Mechanical Properties | High tensile and flexural strength to withstand mechanical forces from circuit breaker operations and short-circuit impacts. |
| Strong Thermal Resistance | Available in B, F, and H classes, suitable for high-temperature areas. |
| Moisture Resistance | Low water absorption keeps electrical performance stable in various environments. |
| Good Processability | Can be cut, drilled, and milled to produce customized components and complex structures. |
Epoxy boards balance electrical insulation with mechanical strength, making them widely used in high-voltage electrical equipment.
(1) Circuit Breaker Internal Insulation
Components: Separators between moving and fixed contacts, arc chute support plates.
Function: Provide phase-to-phase and phase-to-ground insulation, optimize electric field distribution.
Requirements: High temperature resistance, arc resistance, and mechanical strength.
(2) Operating Mechanism Supports and Insulation Plates
Components: Linkages, spring supports, mechanism base plates.
Function: Electrically isolate components and support mechanical operation.
Requirements: Dimensional stability, fatigue resistance, impact resistance.
(3) Busbar and Conductor Support Plates
Components: Busbar connections and conductor supports.
Function: Provide mechanical support and prevent electrical breakdown.
Requirements: High dielectric strength, flexural strength, moisture resistance.
(4) Internal Cabinet Partitions and Support Structures
Components: Gas chamber partitions, insulation supports.
Function: Separate internal gas compartments and support components.
Requirements: Dimensional stability, voltage and heat resistance.
Enhances Safety: Prevents short circuits and arc breakdown, improving overall insulation level.
Increases Reliability: Thermal resistance, moisture resistance, and impact resistance ensure stable long-term operation.
Facilitates Design and Fabrication: Can be cut, drilled, and shaped for customized applications.
Cost Optimization: Offers excellent performance at a relatively low cost, suitable for mass production.
| Material | Features | Application |
|---|---|---|
| FR4 / EPGC201 | Balanced performance, cost-effective | Operating mechanism insulation plates, support plates |
| G10 / EPGC203 | High strength, moisture-resistant | Support structures, mechanical components |
| G11 / EPGC204 | High temperature (155–180℃) | Contact separators, arc chute systems |
| FR5 / EPGC306 | Ultra-high temperature, excellent arc resistance | High-end circuit breakers, heavy-duty areas |
Epoxy sheets in C-GIS are mainly used for circuit breaker insulation components, operating mechanism supports, busbar and conductor supports, and internal partitions. Their excellent electrical insulation, mechanical strength, and thermal resistance make them key materials for ensuring the safe and reliable operation of gas-insulated switchgear.
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Time:11-15 2025
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