Selecting the right insulating material is a critical step in the design and manufacturing of transformers and high-voltage electrical equipment. As a high-performance insulation solution, pultruded rods have gained widespread application in the high-voltage equipment sector due to their excellent electrical properties, reliable mechanical strength, and outstanding heat resistance. This article provides a detailed analysis of the core characteristics, specific applications, and scientific selection methods for pultruded rods, helping you fully understand their crucial role in transformers and high-voltage electrical devices.
Pultruded rod insulation materials are glass fiber-reinforced epoxy resin composites produced through the pultrusion process. They combine high mechanical strength, excellent insulation properties, and exceptional heat and chemical resistance, making them suitable for electrical equipment operating under high-voltage and high-temperature conditions.
The material has a very high dielectric strength, effectively isolating high voltages and preventing electrical arcs and insulation breakdown.
Reinforced with glass fibers, pultruded rods exhibit high tensile and flexural strength, capable of withstanding mechanical stresses during transformer and high-voltage equipment operation.
Pultruded rods can operate stably under high temperatures, with a typical thermal rating of Class B (≥130°C).
They resist oils, acids, and various solvents, making them suitable for long-term service in transformer oil environments.
Pultruded rods maintain dimensional stability under temperature and humidity fluctuations, ensuring reliable long-term operation of electrical equipment.
♦ Support and Fixing Structures: Pultruded rods are used as support rods, fixtures, and insulating frames for transformer cores and windings. They maintain structural positioning during start-up, operation, and vibration while providing electrical isolation between components at different potentials.
♦ Lead Insulation: At points where high-voltage leads exit the winding or oil tank, pultruded rods serve as insulating sleeves. They cover lead surfaces to prevent partial discharge and phase-to-phase short circuits under high voltage.
♦ Tap Changer Insulation: Pultruded rods are used for insulating moving and fixed contacts, as well as operating rods in tap changers. They withstand instantaneous voltage surges during switching, ensuring safe and reliable voltage regulation.
♦ Circuit Breaker Insulating Components: Pultruded rods are applied as insulating rods for moving and fixed contacts and as insulating parts of operating mechanisms. They meet both insulation and structural load requirements under instantaneous high voltage and mechanical stress during short-circuit interruptions.
♦ Disconnect Switch Supports: Installed at conductive arm supports and base insulators of disconnect switches, pultruded rods provide insulation between live components and grounded housings, ensuring stable switching performance in outdoor or high-voltage switchgear environments.
♦ Instrument Transformer Insulation Structures: Used in current and voltage transformers for winding frames and outgoing terminals, pultruded rods adapt to compact internal structures and enhance insulation reliability, ensuring accurate measurement and protection.
When choosing pultruded rods, pay attention to the following:
Electrical Parameter Matching: Select products with dielectric strength appropriate for the voltage level and environmental conditions.
Mechanical Performance Suitability: Assess tensile and compressive strength to ensure the material can withstand mechanical stresses in its application.
Environmental Adaptability: Consider temperature, humidity, and chemical exposure when selecting models with appropriate durability.
Standards and Certifications: Prefer products certified under ISO, IEC, or UL to guarantee quality and safety.
Maintenance and Lifespan: Under normal conditions, pultruded rods can last over 20 years. Regular inspections are recommended to prevent mechanical damage and material aging.
Pultruded rods play an indispensable role in transformers and high-voltage electrical equipment. By understanding their characteristics, applications, and selection criteria, you can maximize their advantages and improve overall equipment performance and reliability. For detailed technical specifications or procurement guidance on pultruded rod insulation materials, contact our professional team!
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