General Description:
The document outlines the specifications and standards for Polymer Line Post Insulators provided by Ningbo Dowei Electric Co., Ltd. These insulators comply with international standards such as IEC 61466, IEC 61109, IEC 61952, and ANSI C29.13. They are manufactured under ISO 9001 certification and have been tested by KEMA, CESI, CE, TUV, UL, and ASTA. The design considers seismic standards (IEEE Std 693, NCh2369) and structural standards (ASTM A325, ANSI/AISC 360, AWS D1.1). They are suitable for high altitudes up to 5000 meters and are made from corrosion-resistant fiberglass with a unique vacuumizing method for bubble-free vulcanization. The silicone rubber used offers high hydrophobicity and tracking resistance.

Typical Specification:
The document provides detailed specifications for Polymer Line Post Insulators according to ANSI standards. Key parameters include:

• Voltage Class: Ranges from 69 kV to 230 kV.
• Section Length: Varies from 775 mm (30.5 in) to 2766 mm (108.9 in).
• Dry Arcing Distance: From 617 mm (24.3 in) to 2540 mm (100.0 in).
• Leakage Distance: From 1544 mm (60.8 in) to 6553 mm (258.0 in).
• Positive Critical Impulse Flashover: Ranges from 380 kV to 1505 kV.
• Low Frequency Flashover: Dry flashover ranges from 250 kV to 905 kV, and wet flashover from 225 kV to 650 kV.
• Specified Cantilever Load (SCL): From 27.1 kN (6090 lbs) to 6.5 kN (1469 lbs).
• Maximum Design Cantilever Load (MDCL): From 13.5 kN (3045 lbs) to 3.3 kN (735 lbs).