Product Information

• Model: U240BP
• U Refers To Disc Suspension Insulator
• 240 Indicates a rated Mechanical failing load of 240kN
• B For Ball And Socket Type
• P For Anti-Pollution type glass Insulator

• 320 Indicates that the diameter of the insulator disc is 320mm (insulators with disc diameters of 280mm are also available).
• 170 Indicates that the height of the insulator structure is 170mm.
• 550 Indicates that the creepage distance of the insulator is 550mm (insulators with creepage distances of 450mm are also available).

• Type: Anti-Pollution Profile Toughened Suspension Type
• Rated mechanical load: 240kN (about 24 tons)
• Purpose: Widely applicable as insulation support for medium and high voltage transmission lines and substation equipment, capable of stable operation under various climatic conditions.

• The product model is in accordance with IEC60383-1:1993, MOD / GB/T1001.1
• The connection structure is in accordance with GB/T4056-2008 (IEC60120:1984, MOD) and BS 3288 part III.
• According to customer requirements, the locking pin can be either W-pin or R-pin.

Product Drawing

Product Parameters

Suspension Insulator Components

Suspension insulators consist of the following elements:

• Dielectric Shell: Made of toughened glass designed with appropriate properties and shape for optimal performance under specific environmental conditions.
• Cap: Hot-dip galvanized nodular or ductile malleable cast iron cap.
• Pin: Hot-dip galvanized forged steel pin.
• Assembly: The cap and pin are secured onto the glass piece using high-strength aluminous cement to withstand severe thermomechanical stress.

The insulator cap features a stainless steel or phosphor bronze locking device (split pin) which ensures a secure coupling of units.

Additionally, pins can be protected using an anti-corrosion zinc sleeve (sacrificial anode) upon request. This zinc sleeve is highly recommended for insulators deployed on power lines in heavily polluted environments.

Glass Insulator Shell Cross-section

Under long-term electrical stress, contaminants can trigger local arcs, leading to insulator surface carbonization (electrocorrosion). Adequate creepage distance is critical to disperse the electric field strength, reduce the risk of local discharge, and significantly extend the service life of the equipment.

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