Nexans has completed the validation of Corecheck, a composite-core monitoring technology developed with Epsilon Composite. The system has been deployed on a 380 kV transmission line operated by Dutch transmission system operator TenneT, enabling utilities to verify the structural integrity of composite-core overhead conductors during transport, installation and commissioning.
As part of its strategy to expand transmission capacity by 2045, TenneT is deploying High Temperature Low Sag conductors, including Nexans' High Voltage Composite Reinforced Conductor, to upgrade existing overhead lines and increase network capacity without the need for major new infrastructure.
With electricity grids facing increasing demand from renewable energy, electrification and higher power consumption, composite-core conductors are being adopted to improve transmission capacity. Corecheck detects internal defects in the composite core using a breakdown voltage test that makes use of the insulating properties of the conductor's glass fibre outer layer. The field-based test requires minimal operator training and can typically be completed by a single technician in around five minutes per conductor without delaying installation. The system also provides full traceability by recording operator identification, conductor batch information and measurement results for every test performed.
