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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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What are the main factors to be consider which preparing the maintenance schedule?
Voltage
Current
Size
All of these
Size
Quick Summary: Maintenance schedules are primarily determined by the physical characteristics, capacity, and operational complexity of electrical equipment. While electrical parameters like voltage and current are important for testing and monitoring, the 'size' (rating, dimensions, and capacity) directly dictates the frequency, resource allocation, and specific procedures required for maintenance.
Maintenance schedules are primarily determined by the physical characteristics, capacity, and operational complexity of electrical equipment. While electrical parameters like voltage and current are important for testing and monitoring, the 'size' (rating, dimensions, and capacity) directly dictates the frequency, resource allocation, and specific procedures required for maintenance.
Minterval∝Complexity×Size1 — Represents that maintenance frequency is inversely proportional to equipment complexity and size
Eload=PratedPactual — Represents the load factor which influences maintenance wear-and-tear
The maintenance interval is governed by the Mf=f(R,E,C) model, where Mf is the maintenance frequency, R is the rated capacity (size), E is the environmental stress, and C is the complexity. Larger equipment typically carries higher operational risk and requires more rigorous preventive inspection, thereby making physical size and rating the primary factor in planning the duration and frequency of maintenance tasks.
Size determines the scale of resources (labour, crane/lifting tools) required for maintenance.
Larger equipment often implies higher power ratings, necessitating more frequent insulation resistance checks.
Maintenance schedules are documents that outline time-based (preventive) or condition-based (predictive) tasks.
Environmental factors (dust, temperature, humidity) influence the stringency of the schedule regardless of size.
Prevents catastrophic failures by addressing wear before breakdown.
Extends the operational life of capital-intensive electrical assets.
Ensures safety compliance with industrial standards (e.g., IS/IEC codes).
Can be costly if over-maintained unnecessarily.
Requires significant downtime, which may impact production schedules.
Industrial Substations and Switchgear units.
High-capacity distribution transformers.
Industrial motor and drive systems.
Voltage and Current are operational parameters monitored during maintenance, but 'Size' serves as the base classification criterion for the maintenance plan structure.
Standard IS codes define maintenance cycles based on kVA/MVA ratings, confirming Size as the primary scheduling factor.
C is correct — Size is the fundamental parameter that defines the complexity and resource requirements for preparing a comprehensive maintenance schedule.
Always remember that while electrical variables (V,I) trigger condition-based monitoring, equipment physical rating (Size/MVA) dictates the structural template of the Maintenance Schedule.