Preventive maintenance follows a predefined schedule based on time or operating hours.

Data recording allows for trend analysis, helping in the identification of degradation patterns.

It significantly reduces the 'Breakdown' risk compared to reactive approaches.

Compliance with IS/IEC standards often mandates detailed maintenance logs.

Increased reliability and uptime of power systems.

Cost-effective by preventing catastrophic equipment failure.

Enhanced safety for operating personnel.

Higher initial labor costs compared to run-to-failure methods.

Risk of 'over-maintenance' if intervals are too frequent.

Possibility of inducing human error during unnecessary intrusive testing.

Power Transformers (Insulation monitoring)

Circuit Breakers (Contact timing/testing)

Switchgear and Busbar systems

Breakdown maintenance is purely reactive and performed only after a failure occurs.

Predictive maintenance uses condition monitoring (like thermography or oil analysis) to anticipate failure, whereas preventive is largely interval-based.

Recording activities are usually documented in a 'Maintenance Log Book' or a CMMS (Computerized Maintenance Management System).