The primary difference lies in their installation and insulation. An OHTL uses bare conductors supported by towers, with the surrounding air providing insulation. This is generally the most cost-effective method for long-distance power transmission. In contrast, an UGTL utilizes insulated cables that are buried underground. While UGTLs are often used in urban areas to mitigate visual impact, they are more expensive and complex to install and maintain. As a leading manufacturer, we provide a comprehensive range of equipment for both OHTL and UGTL projects.