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Classification of maintenance.
Preventive maintenance
Predictive maintenance
Breakdown maintenance
All of these
All of these
Maintenance in power systems refers to the systematic process of inspecting, testing, and repairing electrical assets to ensure reliability and longevity. It is broadly classified into preventive, predictive, and breakdown (corrective) strategies to manage the life cycle of equipment like transformers and circuit breakers.
Maintenance in power systems refers to the systematic process of inspecting, testing, and repairing electrical assets to ensure reliability and longevity. It is broadly classified into preventive, predictive, and breakdown (corrective) strategies to manage the life cycle of equipment like transformers and circuit breakers.
MTBF=Number┬аof┬аFailuresTotal┬аOperating┬аTimeтАЛ тАФ Mean Time Between Failures metric
Availability=MTBF+MTTRMTBFтАЛ тАФ Asset reliability indicator
Maintenance strategies are categorized by their timing and condition assessment. Preventive maintenance occurs on a schedule regardless of equipment state to reduce failure probability. Predictive maintenance utilizes diagnostic data (e.g., DGA for transformers) to perform actions only when evidence of deterioration is detected. Breakdown maintenance is reactive, performed only after equipment failure, often resulting in higher downtime costs.
Preventive maintenance follows a predefined time-based or cycle-based schedule.
Predictive maintenance uses condition monitoring techniques like infrared thermography or dissolved gas analysis (DGA).
Breakdown maintenance is only viable for non-critical, low-cost components where failure does not jeopardize system stability.
Maintenance objective is to maximize Availability and minimize TotalCostofOwnership (TCO).
Enhanced equipment safety and operational lifespan
Reduction in unplanned outages
Improved compliance with regulatory safety standards
High initial investment for predictive sensor equipment
Potential for over-maintenance in strict preventive regimes
Transformer oil analysis and bushing inspection
Circuit breaker contact wear monitoring and operating mechanism lubrication
Insulation resistance (Megger) testing of switchgear
Preventive maintenance is 'time-directed', whereas Predictive is 'condition-directed'.
Option D is correct because all listed options constitute standard maintenance methodologies in industrial power systems.
D is correct тАФ Maintenance is categorized into preventive, predictive, and breakdown strategies to optimize asset performance and ensure system reliability.
When analyzing transformer maintenance, remember that oil degradation (acidity and moisture content) is the primary indicator for both preventive and predictive health assessments.