Germany: Maschinenfabrik Reinhausen (MR) has broadened its TESSA® FLEETSCAN 2D methodology, which was originally developed for transformers, to include circuit breakers in air-insulated systems. The company’s long-term goal is to provide condition assessments across all major substation assets, including full switching bays.
Developed with the University of Wuppertal, the system uses a two-dimensional model to evaluate both sustainability (via lifetime consumption index) and reliability (via failure risk index). This helps grid operators make informed maintenance and investment decisions, balancing OPEX and CAPEX considerations.
The approach combines visual inspections, infrared thermography, electrical measurements, and SF₆ gas analysis with asset management criteria, providing a structured framework for lifecycle decision-making.
A pilot project with Netze Duisburg GmbH assessed twelve 110-kV circuit breakers, mostly at Level 2 of the three-level model. While limited data created some uncertainty, the methodology incorporates a confidence range and allows refinement through deeper testing at Level 3.
Feedback from the pilot was positive, with further breaker assessments already planned. MR presented results at CIRED 2025 in Geneva and held an online workshop with operators from the DACH region. A paper is also planned for CIGRÉ 2026 in Paris.
Looking ahead, MR intends to extend the methodology to include current and voltage transformers as well as disconnectors. By covering both AIS and GIS equipment, the company aims to deliver a comprehensive digital assessment tool for entire substations.
Source: MR
