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What is the insulation performance of non-metallic box type substations

source：www.h761.cn  |  Release time：2025年02月25日
The insulation performance of non-metallic box type substations is usually good, mainly reflected in the following aspects:
1. The material itself has good insulation performance
       Glass fiber reinforced plastic: Commonly used materials such as glass fiber reinforced plastic (FRP) have good electrical properties. If the electric meter box made of it is immersed in water for 24 hours, the insulation resistance can reach 1.0x10M Ω, the arc resistance is 180 seconds, the leakage tracing index is ≥ 600V, and the insulation protection and anti creepage indicators meet the relevant DIN/VDE standards.
       Polyester resin: A non-metallic box type substation made of SMC composite material (composed of unsaturated polyester resin as the matrix and glass fiber as the skeleton), which has the advantages of high insulation strength, corona resistance, flame retardancy, etc., and can effectively isolate electrical equipment from the external environment.
       Other materials: Non metallic materials such as plastics and some composite materials are also poor conductors of electricity and have certain insulation properties. Compared to metal materials, they naturally have a better insulation foundation.
2. Design and structure to ensure insulation effect
       Reasonable insulation spacing: When designing non-metallic box type substations, the distance between internal electrical components and the distance between electrical components and the box body will be reasonably planned based on factors such as the voltage level and usage environment of the electrical equipment, ensuring sufficient air insulation clearance and reducing the possibility of discharge and leakage.
      Multiple insulation protection: In addition to the insulation function of the box material, various insulation measures such as insulation coatings, insulation partitions, and insulation sleeves may also be used internally to further improve insulation performance, such as wrapping electrical connection parts with insulation sleeves to prevent leakage.
3. Able to adapt to various environments and maintain insulation stability
      Strong weather resistance: Non metallic materials have good weather resistance and can resist the effects of natural environments such as ultraviolet radiation, high temperature, low temperature, and humidity. Under different climatic conditions, it is less prone to deformation, aging, cracking, and other issues, thus maintaining good insulation performance and avoiding significant degradation of insulation performance due to environmental factors.
      Corrosion resistance: Non metallic box type substations have good corrosion resistance, which can avoid damaging the insulation layer or causing a decrease in insulation performance due to corrosion. They can maintain stable insulation performance in harsh corrosive environments such as seaside and chemical parks.

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