Aerodynamic Disc Suspension Glass Insulator

Aerodynamic disc suspension glass insulators (commonly known as "straw hat type") feature a streamlined large umbrella-shaped design, emphasizing low wind resistance, low contamination accumulation, and strong vibration resistance. They are suitable for areas with strong winds, frequent sandstorms, and high bird activity, and have lower operation and maintenance costs compared to traditional umbrella types. The following provides a detailed explanation from the core design, application scenarios, key parameters, selection, and operation and maintenance aspects:

(1) Core Design and Advantages

1) Umbrella Shape Design: Large diameter umbrella disk (typically 380mm), with a streamlined and edgeless lower surface to reduce air turbulence and wind resistance, lower the accumulation of sand and bird droppings, and minimize the risk of ice bridging.

2) Basic Structure: Tempered glass component + steel cap + steel foot + cement bonding, inheriting the self-breaking feature at zero value, eliminating the need for pole climbing to measure insulation, and allowing for direct detection and replacement of deteriorated parts.

3) Core Advantages

• Low Wind Resistance: The streamlined shape reduces wind pressure load, making it suitable for typhoon and strong wind areas, and reducing line vibration fatigue.
• Strong Self-Cleaning: The smooth and edgeless lower surface makes it easy for wind and rain to remove contaminants, reducing the frequency of cleaning.
• Cost-Effective Operation and Maintenance: The self-breaking at zero value and low contamination accumulation reduce the cost of manual inspection and cleaning.
• Bird Damage Prevention: The large umbrella disk can shield against bird droppings and is often installed at the top of the insulator string for overall protection.

(2) Application Scenarios

• Areas with frequent strong winds or typhoons, deserts or gobi with frequent sandstorms, and transmission lines with high bird activity.
• High-altitude areas with strong ultraviolet radiation, light to moderate pollution, and low rainfall.
• Lines with large spans and large cross-section conductors that are sensitive to wind vibration.

(3) Selection and Operation and Maintenance Points

1) Selection Principles

• Select the rated breaking load based on the mechanical load of the line (e.g., 70/100/120/160kN).
• Prioritize light to moderate pollution areas; in heavily polluted areas, it is recommended to use in combination with pollution-resistant types or select composite umbrella types.
• In strong wind areas, prioritize models with a suitable structural height and lower wind resistance coefficient (e.g., 127mm structural height).

2) Operation and Maintenance Suggestions

• Inspection Cycle: Every 6-12 months in plains and rural areas, and every 3-6 months in strong wind and sandstorm areas.
• Key Inspection Points: Umbrella disk cracks, rust on steel caps and feet, and self-breaking pieces, and replace them in a timely manner.
• Auxiliary Protection: In areas with high bird activity, add one piece of this type of insulator at the top of the string and install bird spikes.