Glass Insulators: Key Components Explained

Key Components and Standards for Glass Insulators

Glass insulators play a vital role in the efficiency and safety of high voltage transmission lines. Ensuring their components meet stringent requirements is crucial for optimal performance. Below, we delve into the standards and specifications for each component.

Tempered Glass Components

• Compliance with Standards: All tempered glass components must adhere to JB/T 9678-2012 and GB/T 1001.1. They should be dense and free from defects like cracks, wrinkles, bubbles, impurities, and collision marks.
• Surface Quality: The glass surface should have a uniform tempered layer, with all exposed areas flat and smooth.
• Durability Tests: Components are required to withstand 3 hot and cold impacts and at least 2 nickel sulfide homogenization treatments, with a removal rate not exceeding 0.5 ‰.
• High Voltage Lines: For 800kV and above, standards are even more stringent, demanding additional impact resistance and a lower removal rate for the final treatments.
• Appearance and Defects: External umbrella-shaped glass components must be free from external cracks and missing materials, with only minor allowable deformations.

Iron Cap and Steel Feet Specifications

• Smooth Metal Surfaces: Iron caps and steel feet surfaces should be smooth to avoid corona discharge, adhering to JB/T 8178 and JB/T 9677 standards.
• Material Requirements: Caps are made from heat-treated malleable cast steel, ductile iron, or similar materials, free of defects.
• Construction: They should not be manufactured using methods that involve more than one piece of material, such as welding or cold shrinkage crimping.

Locking Pin Standards

• Compliance and Material: Locking pins must comply with GB/T 25318 and GB/T 1001.1, ideally made from austenitic stainless steel or other corrosion-resistant materials.
• Design Specs: R-type pins for heavy loads should have two ends to prevent them from coming out of the ball socket during locking and release.

Cement Adhesive Requirements

• Material Composition: Use Portland cement or high alumina cement, with a strength grade of 52.5 or higher according to JB/T 4307.
• Surface Quality: The exposed surface should be flat with minimal imperfections, and cracks must not exceed a width of 0.2mm.
• Manufacturing Integrity: Avoid using other materials to cover cement adhesive surfaces, maintaining quality and adherence to specifications.

By meeting these rigorous component standards, Jiangxi Huayao Electric Co., Ltd offers high-quality glass insulators ranging from 40kN to 550kN, suited for ultra-high voltage transmission lines from 10kV to 500kV.