The Netherlands: A new inspection technology, CORECHECK, has successfully completed field testing on a 380 kV transmission line in the Netherlands, confirming its ability to verify the integrity of composite core conductors throughout all stages of deployment.
The system, developed by Epsilon Cable, was tested under real installation conditions to assess the structural condition of HVCRC composite cores. The project supports the long-term energy transition strategy of TenneT, which is scaling up the use of advanced conductors through agreements with partners including Nexans and De Angeli Prodotti.
The technology addresses a key challenge in the sector, as composite cores can be affected by handling during transport and installation, while traditional field methods for internal verification have been limited.
CORECHECK uses a breakdown voltage test to identify internal defects or damage within the composite core, relying on the insulating properties of the glass fibre outer layer. The approach is based on established electrical inspection principles and is designed for ease of use in the field.
Each test takes around five minutes per conductor and can be carried out by a single operator using lightweight equipment without affecting installation timelines. Testing was completed at multiple stages, including after core production, stranding, delivery to site, and final installation by the EPC.
The system was also proven under challenging conditions such as high winds, heavy rain, fog, and sub-zero temperatures, including operation near energised parallel circuits. It also provides full traceability, recording test data, operator details, and conductor batch information.
The findings will be further presented at CIGRE Paris 2026, building on earlier technical work shared in 2024.
Source: T&D India
