The 765kV Solidcore Post Insulator with 5000mm Stack Height is used for EHV Sub-stations in 400KV and above category. Modern Insulators Ltd. Offers 765kV Solidcore Post Insulator with 5000mm Stack Height. Modern Insulators Ltd. Is an ISO 9001:2000 and 14001:2004 certified company, that manufactures Textile and High Voltage Porcelain Insulators range of 33KV to 765 KV.