High-voltage power cables increasingly utilise conductor designs that significantly reduce skin and proximity effects. This enables more power transmission with the same cross-section. The individual strands of these conductors are insulated from each other (enamelled) and are often arranged in segments (Milliken type). This conductor structure complicates the cable connection process. PFISTERER has developed FrontCon, which uses a completely new connector principle to significantly simplify and shorten installation.
New connection technology
Connecting single-strand insulated cable conductors is a time-consuming process that only works to a limited extent: separate the individual strands, strip them one by one, then rearrange them as far as possible in the original form - without damaging any of the strands. Despite best efforts, the original conductor structure is not achieved at the installation site. Moreover, removing the insulation means losing the benefit of single-strand insulated cables at the end of the conductor. PFISTERER has completely rethought the connection of single-strand insulated conductors.
80% shorter installation time
With FrontCon, PFISTERER has developed a solution that significantly reduces the time required and creates a defined connection via the front face of the cable. Installation takes only around 2 hours - not longer than for conventional cables with standard connections. At the same time, possible damage when stripping the individual strands is prevented. That significantly reduces the risk of installation errors.
FrontCon is installed directly on the end of the cable - nowork is required on the individual strands. Specially developed contact balls make contact with the front faces of the individual strands. Together, these contact balls behave like a liquid. They compensate for slight unevenness at the conductor end, and ensure that the same contact forces are applied across the whole conductor cross-section. Power flows via the conductor front face and the contact balls. This enables a very short and compact contact system for large conductor crosssections.
Proven contact system for HV cable fittings
FrontCon is available as a connection technology for CONNEX cable connectors and IXOSIL terminations, as well as for cable connections in MSA joints and typetested with specific cables. The first cable projects have now been in operation for several years. The contact system can be adapted for any fittings, enabling reliable and cost-effective solutions in cable systems. It can be installed vertically or horizontally. The range covers copper cables up to a cross-section of 2,500 mm². Other solutions can be implemented on request.
How it works
FrontCon is installed directly on the conductor end. The cable is sawn off straight, and the cable insulation is removed. The pressure-stable contact system clamps centrically onto the conductor.
Contact balls are poured into the connector. Tightening the pressure screw presses the balls against the front face of the conductor ends. Reliable contact is established.
A built-in spring mechanism compensates for settling losses. This ensures that contact forces and low transmission resistances are maintained at different temperatures and throughout the full service life.