Pressurized Air Cables (PAC) are electrical transmission systems designed for medium- and high-voltage applications. They use dry pressurized air as an insulating medium and combine electrical insulation, mechanical protection, and electromagnetic shielding within a fully metallic system.

Pressurized air cables enable high transmission power, low line losses, reduced reactive power requirements, and integrated condition monitoring. In addition, they are PFAS-free and do not require SF₆ as an insulating medium.

The technology can be used in medium- and high-voltage networks ranging from approximately 12 kV to 420 kV. Typical applications include transmission grids, substations, power plants, tunnel systems, and infrastructure projects with high power requirements.

In many applications, pressurized air cables can serve as an alternative to overhead lines, particularly when space constraints, landscape preservation, permitting processes, or environmental requirements make an underground solution preferable.

Compared to VPE cables, PAC offer potentially higher transmission power, lower reactive currents, integrated condition monitoring, and fully metallic sheathing. However, the optimal technology always depends on the specific project requirements.

Yes. PAC use dry air as an insulating medium and do not require PFAS-based insulation systems or SF₆.

The system features built-in pressure monitoring. Operating parameters can be continuously monitored, enabling early detection of anomalies and targeted condition assessment.

PAC are designed for long-term, reliable operation. Standardized components and integrated monitoring support efficient maintenance and enable quick recovery times in the event of a malfunction.

Yes. The technology was specifically designed for applications with limited space and can be used in protective conduits, microtunnels, walk-in cable tunnels, and industrial infrastructure.

On the comparison pages, you will find technical analyses of PAC, VPE lines, overhead lines, and other topics such as magnetic fields, leak tightness, pressure management, and various system configurations. Supplementary fact sheets are available for download..