Sheath Voltage Limiters

Insulect’s Sheath Voltage Limiters are engineered for high-performance surge protection in transmission and distribution networks. They are ideal for use in substations, renewable energy projects, and urban underground cable systems. Applications include:

• Cable sheath voltage protection for underground HV systems

• Integration into Link Boxes for SVL or direct earthing applications
• Surge mitigation in cross-bonded and insulated cable networks

Insulect’s Sheath Voltage Limiters (SVLs) are engineered to protect high-value underground HV cables from damaging sheath voltage rises and fault-induced current surges. Manufactured and tested in Australia to stringent standards, our SVLs deliver reliable performance in direct earthing, SVL earthing, and cross-bonded configurations.

Available in discharge classes up to 20 kA and voltage ratings from 1.5 kV to 9.0 kV, SVLs are housed in durable, IP-rated enclosures suitable for both in-ground and structure-mounted installations. Each unit is precision-configured to meet project-specific requirements and withstand harsh environments.

Whether integrated into Link Boxes or used independently, Insulect’s SVLs deliver proven surge protection, sheath current control, and dependable performance across Australia’s most demanding underground cable projects.

Insulect’s SVLs provide trusted protection in high-value underground cable systems. Available in a wide voltage range (1.5 kV to 9.0 kV), these devices are engineered to manage sheath voltage rise and fault-induced power flows. With mounting options for indoor and outdoor environments, SVLs integrate seamlessly into Link Box configurations across transmission and distribution networks.

High-voltage cable installations face harsh environmental and operational challenges—moisture ingress, thermal cycling, mechanical vibration, and corrosive conditions. These threats can compromise insulation and shorten asset life if not properly managed.

Insulect’s cable link boxes are engineered to overcome these challenges with IP68-rated stainless steel enclosures, precision-engineered internal connections, and integrated sheath voltage limiters (SVLs) for overvoltage suppression.

By offering configurations for direct earthing, SVL-based protection, and cross bonding, our solutions reduce sheath currents, extend cable longevity, and increase system reliability. With a focus on durability, modular design, and ease of installation, Insulect SVL-equipped link boxes ensure long-term performance and reduced maintenance for utility, industrial, and infrastructure projects.

Cable link boxes must endure harsh conditions—moisture ingress, thermal expansion, mechanical stress, and corrosive environments—all while safeguarding vital underground cable assets. Insulect’s link boxes address these challenges with fully sealed IP68-rated stainless steel enclosures, robust internal connections, and high-performance sheath voltage limiters (SVLs) to suppress transient overvoltages.

With options for direct earthing, SVL protection, and cross bonding, our link boxes help reduce circulating sheath currents, extend cable life, and improve overall system reliability. Designed for ease of installation and long operational life, they support efficient network upgrades, minimise maintenance demands, and ensure dependable performance across utility and infrastructure applications.