Vessel Power Quality & Generator Investigation

Anonymized vessel case. A prolonged electrical investigation was carried out to capture power-quality behaviour under real vessel loading and to identify generator-side faults that could not be resolved from short static checks.

We logged the electrical system with a power analyzer for approximately 56 hours to capture behaviour across changing vessel loads. Current harmonic distortion reached approximately 90–95% THDi, with strong 3rd, 5th and 7th harmonic components.

A transformer hotspot of approximately 123°C was measured at about 730 kW load. Generator-side checks also identified a Generator 4 PLC fault, a Generator 1 governor power-supply failure, and deficiencies in generator-cabinet cooling.

The measurements showed that the vessel did not have one isolated electrical problem. Significant harmonic distortion and thermal loading were present alongside separate generator-control and cooling deficiencies.

This separated the power-quality findings from the individual generator faults and provided a technically defensible basis for corrective-work priorities.

The diagnostic scope identified the principal measurable electrical conditions and the generator-side defects requiring corrective work. The vessel team received a clear basis for repair planning rather than a single speculative component recommendation.

This case is presented as a diagnostic investigation; it does not claim that every identified corrective action was completed during the same attendance.

Extended logging matters when a fault depends on vessel load or operating state. Combining long-duration measurements with equipment-level checks can distinguish system-wide power-quality problems from separate control, cooling or component faults.