Abstract This article summarizes the operational status of composite insulators (110 kV and above) within the Zhongshan Power Grid. It provides a detailed analysis and discussion on the necessity of auditing whether the Lightning Full-Wave Impulse Withstand Voltage of composite insulators meets the localized lightning protection requirements. The study highlights that maintaining a sufficient effective dry arc distance is the critical factor in achieving the required lightning protection level. Overview In recent years, composite insulators have been widely adopted in transmission lines of 110 kV and above due to their superior anti-pollution performance, lack of "zero-value" or "low-value" units, lightweight nature, ease of installation, and minimal maintenance...

1. Dimensional Tolerances Unless otherwise specified, the dimensional tolerances of composite insulators shall comply with the following regulations (where d is the inspection dimension in mm): For d ≤ 300 mm: ± (0.04d + 1.5) mm For d > 300 mm: ± (0.025d + 6) mm (Maximum deviation: ±50 mm) 2. Structural Composition A composite insulator consists of at least two insulating parts: the core rod and the sheath (with integrated sheds), equipped with metal end-fittings. 3. Composite Insulator Core Rods The core rod is the internal insulating component of the composite insulator, designed to ensure the specified mechanical strength. Material: It is manufactured from glass fiber reinforced resin rods (FRP/GRP). Corrosion Resistance: The rod must...

1. The Critical Role of the Resin Matrix Resin serves as the matrix material in the core rod, functioning to encapsulate and bind the glass fibers. Although resin accounts for only about 20% of the core rod's total weight, it occupies over 35% of its spatial volume. Its structural properties are vital to the core rod's performance, particularly in providing a protective barrier for E-glass (alkali-free) fibers. The quality of the resin directly determines the long-term stability and acid-corrosion resistance of the core rod. 2. Selection of the Curing Agent (Hardener) The resin system primarily consists of epoxy resin, a curing agent, an...

1. The Dominant Role of Glass Fiber Glass fiber is the primary structural material in insulating core rods, serving as the reinforcing "skeleton." In composite insulators used domestically, glass fiber accounts for approximately 80% of the core rod's total weight and about 65% of its volume. Consequently, the properties of the glass fiber dictate the overall performance of the core rod. 2. Advantages of E-Glass (Alkali-Free Glass Fiber) Composite insulator core rods typically utilize E-glass (Alkali-free glass fiber). E-glass is primarily composed of silicon dioxide (SiO₂), aluminum oxide (Al₂O₃), and boron oxide (B₂O₃). These oxides possess stable molecular structures and exist in a crystalline...

Process Overview The pultrusion process for insulating core rods involves non-twisted fiberglass rovings being impregnated with resin in a dip tank at a controlled traction speed. After being pre-formed by specialized equipment, the materials enter the mold cavity. The final product is formed through complex physical and chemical reactions as it passes through specific zones: cooling, preheating, gelation, and curing. The fundamental solidification of the core rod occurs within the mold cavity. Therefore, the process parameters for each zone must be strategically selected based on the continuous movement and phase transitions of the impregnated fibers inside the mold. Zone Analysis within the Mold Cavity ...

Taporel's High-Temperature and Acid-Resistant Composite Insulator Core Rods offer not only exceptional mechanical and electrical properties but also superior stress-corrosion resistance integrated into our high-temperature resistant formula. Our core rods have successfully passed a 7,200-hour stress-corrosion resistance test, vastly exceeding the industry standard requirement of only 96 hours. This makes our products a leader in long-term reliability for harsh environments. Applications & Environments These core rods are compatible with various composite insulator manufacturing processes, especially injection molding. We strongly recommend using our high-temperature and acid-resistant rods for insulators installed in: High-pollution areas (Industrial zones, coastal regions). Regions prone to acid rain. Technical Classifications & Specifications Our composite core rods...

No. Technical Requirements / Parameters Unit Specification 1 Density (at 20±2°C) g/cm³ ≥ 2.15 2 Water Absorption % ≤ 0.05 3 Tensile Strength MPa ≥ 1260 4 Tensile Modulus kN/mm² ≥ 56 5 Flexural Strength MPa ≥ 900 6 Compressive Strength MPa ≥ 590 7 Torsional Strength N/mm² ≥ 90 8 Hot Flexural Strength (at 150°C) MPa ≥ 300 9 Dye Penetration Test min ≥ 15 10 Water Diffusion Test (1% NaCl boiling 100h, 12kV, 1 min) μA ≤ 100 11 Power Frequency Breakdown Voltage kV/cm ≥ 56 12 Full-wave Impulse Voltage kV/cm ≥ 95 13 Heat Deflection Temperature (HDT) °C ≥ 155 Applicable Standards:Our products comply with GB, DL, IEC, and ASTM international standards, as well as Enterprise Standards.

IntroductionDefects in composite insulator core rods are often unavoidable during the manufacturing process. How can these defects be accurately diagnosed? Today, Taporel Electrical Insulation will share some professional knowledge regarding infrared diagnostic techniques. 1. Infrared Characteristics of Internal Defects in Composite Insulators The primary heat sources in composite insulators include polarization loss, partial discharge (PD), and leakage current. Polarization loss and PD are typically caused by excessive electric field concentration due to internal defects. Heating caused by leakage current is mainly manifested as surface degradation. The current concentrates at these degraded areas, creating a significant temperature difference compared to the surrounding regions. Generally,...