Depending on the type of insulating material used, power insulators can be classified into three main categories.

Release date:

2025-08-28

Power insulators can be categorized into three main types, each with distinct characteristics, advantages, and suitable application scenarios.

Depending on the type of insulating material used, power insulators can be categorized into three main types, each with distinct characteristics, advantages, and ideal application scenarios—details are outlined below:

Type	Core material	Core Advantages	Applicable Scenarios	Limitations
Porcelain insulator	Ceramics (such as alumina ceramics)	1. Stable insulation performance with excellent temperature resistance (capable of handling a temperature range from -40°C to 100°C) 2. High mechanical strength and long service life (standard design lifespan of 20+ years) 3. Relatively low cost and mature technology	1. Traditional High-Voltage Transmission Lines (110kV–500kV) 2. Substations in arid, low-pollution areas 3. Cost-sensitive distribution systems	1. Heavy weight (3–5 times that of composite insulators under the same specifications), making transportation and installation particularly challenging. 2. Weak resistance to pollution flashovers; insulation failure easily occurs after smog or industrial dust settles on the surface. 3. Highly brittle and prone to shattering upon impact
Glass insulator	Special tempered glass	1. Excellent insulation performance with low dielectric loss 2. "Zero-Value Self-Destruct" Feature (When insulation fails, the glass component automatically breaks, making it easy for operations and maintenance teams to identify and replace it) 3. Highly resistant to aging and difficult to accumulate dirt	1. High-voltage transmission lines (220kV–750kV) 2. Dore, Moderately Polluted Area	1. Still relatively heavy, with slightly lower impact resistance compared to porcelain insulators. 2. Prolonged exposure can lead to "mold growth" on glass surfaces, so regular cleaning is required.
Composite Insulator	Polymer composite material (silicone rubber umbrella skirt + glass fiber/carbon fiber core rod + metal fittings)	1. Lightweight: Weighs only 1/3 to 1/5 as much as porcelain insulators, boosting installation efficiency by more than 50%. 2. Strong resistance to pollution flashovers: The silicone rubber sheds feature "hydrophobic properties" (water forms small droplets that roll off, preventing the formation of conductive water films), making them ideal for coastal areas with high salt spray and heavily polluted industrial environments. 3. Age-resistant and corrosion-resistant: Capable of withstanding UV radiation, ozone, and acid-alkali erosion, with a designed lifespan of up to 30 years 4. Flexible mechanical performance: The mandrel exhibits excellent tensile and bending strength, making it suitable for complex tower structures.	1. Ultra-High-Voltage Transmission Projects (1000kV and above) 2. New energy power plants (wind farms, photovoltaic step-up stations) 3. High-Speed Rail Traction Power Supply System 4. Coastal areas, industrial zones, and regions frequently affected by smog	1. The initial purchase cost is slightly higher than that of porcelain insulators. 2. During long-term operation, "mandrel corrosion" should be prevented (sealed-process products are recommended). 3. Under high-temperature conditions (such as exceeding 120°C), the aging of the skirt tends to accelerate.