Managing Moisture in GSU Transformers: A Comprehensive Guide for Engineering Professionals
from Energy Risk Engineering Hosted by John Munno - Risk Engineer, Golfer, Cancer Survivor.
In this episode, we explore why keeping moisture out of Generator Step‑Up (GSU) transformers is critical to reliability and safety. Join us as we map out: Primary Water Ingress Points How breathers, bushings, gaskets and inspection plates can let moisture inside—even in short timeframes. Consequences of Excess Moisture • Electrical‑level risks: loss of dielectric strength & spikes in partial discharge • Chemical‑and‑physical degradation: accelerated cellulose aging, acid by‑products & corrosive sulfur reactions • Thermal challenges: reduced oil conductivity leading to dangerous hotspots Actionable Moisture Thresholds Clear ppm‑based bands with recommended inspection and monitoring intervals—from annual checks below 10 ppm to weekly interventions above 30 ppm. Inspection & Diagnostic Toolbox Step‑by‑step guide to visual seal inspections, infrared thermography, ultrasonic leak‑detection, DGA and frequency‑domain spectroscopy for pinpointing moisture. Sampling & Analysis Best Practices Why Karl Fischer titration is the gold standard, plus correct bottle handling, valve purging and the role of continuous on‑line sensors. Preventive & Corrective Playbook From immediate seal repairs and breather regeneration to medium‑term dry‑out procedures and long‑term maintenance scheduling. Whether you’re a risk engineer, maintenance professional or underwriter, this episode delivers a structured, example‑driven roadmap for keeping your transformers dry—and your operations running at peak performance. Tune in now!
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