400kV Polymer Substation Insulator
International 400kV Substations (Main Application of Composite Insulators)
1. Swedish 400kV Power Grid (SVK)
Scale: 30+ 400kV substations, 1000+ 400kV composite post insulators (20 years of operating experience).
Scenario: Renovation of old substations, high environmental protection requirements; composite insulators are the only designated external insulation solution.
2. Rajasthan, India 400kV Photovoltaic Substation
Project: 2 400/33kV substations (6 bays each), supporting a 450MW photovoltaic power station.
Features: High desert temperatures and strong sandstorms; uses 400kV composite post insulators + hollow insulators, maintenance-free and anti-aging.
3. Oman 400kV Sohar Substation (Middle East)
Scale: 3 400kV main transformers + 8 220kV main transformers; largest 400kV substation in Oman.
Environment: High temperature and humidity, salt spray corrosion; 400kV composite insulators replace porcelain insulators to prevent salt spray flashover.
III. Core Parameters of 400kV Composite Substation Insulators (Suitable for the above-mentioned substations)
Voltage Level: 400kV (AC) / ±400kV (DC)
Type: Post composite insulator (station use), hollow composite insulator (bushing/transformer use)
Mechanical Strength: Cantilever load 8–20kN (suitable for busbar/disconnector support)
Standards: IEC 61952, ANSI C29.19, GB/T 26874
Applicable Environment: Altitude ≤4000m, -50℃~+50℃, heavily polluted/salt spray/strong radiation areas
Our factory & quipment
Customized Size Available
The Drawing
comparison of product parameters
| Height | 4174±50mm | Max Design Cantilever Load(MDCL) | 4kN |
| Min Dry Arcing Distance | 3885mm | Specified Cantilever Load(SCL) | 8kN |
| Min Creepage Distance | 13020mm | Standard | IEC61952 |
| Diameter of the Rod | φ90mm | Rated Voltage | 400kV |
| Number of Sheds | 91 | Power Frequency Withstand Voltage(Dry/Wet) | 850kV/800kV |
| End-fitting Material | Hot Dip Galvanized Steel | Lightning Impulse Withstand Voltage | 1550kV |
| Mean coating thickness(min) | 86μm | Standard | IEC 61952 |
| Core Material | Epoxy & Glass Fiber | ||
| Weather sheds Material | HTV Silicone | ||
| Color | Gray |
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