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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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Which among these tests are performed periodically?
Repair test
Maintenance test
Manufacture test
All of these
Maintenance test
Quick Summary: Maintenance tests are performed periodically on electrical equipment like transformers and circuit breakers to ensure their reliable operation and to monitor their degradation over time. Unlike manufacture or repair tests which are 'one-time' events, maintenance testing is an integral part of a scheduled preventive maintenance program.
Maintenance tests are performed periodically on electrical equipment like transformers and circuit breakers to ensure their reliable operation and to monitor their degradation over time. Unlike manufacture or repair tests which are 'one-time' events, maintenance testing is an integral part of a scheduled preventive maintenance program.
Rins=IV — Insulation resistance measurement
Ploss=VIcosϕ — Determination of power factor/dissipation factor
The principle relies on monitoring the 'Health Index' of assets by measuring parameters such as Insulation Resistance (IR), Dissipation Factor (Tan δ), Contact Resistance, and Dielectric Strength of insulating oil. By comparing periodic test results against the manufacturer's baseline data and previous readings, engineers can identify incipient faults, such as insulation deterioration or contact wear, before catastrophic failure occurs.
Preventive maintenance aims to minimize unplanned downtime.
Periodic tests include Insulation Resistance (Megger test), Transformer Oil testing (BDV), and Contact Resistance measurement (Ductor test).
Maintenance testing follows industry standards like IS 2026 for transformers and IS 13118 for circuit breakers.
Trend analysis of periodic data helps in 'Condition-Based Monitoring' (CBM).
Detects potential insulation failure early
Extends the operational life of the asset
Reduces catastrophic failure risks
Requires scheduled system outages
Increased operational labor costs
Power Transformers in Grid Substations
High Voltage Circuit Breakers (SF6/Vacuum)
Rotating Machines (Motors/Generators)
Manufacture tests (Factory Acceptance Tests) are done at the factory before shipping.
Repair tests are conducted post-overhaul to confirm the equipment is fit for re-energization.
Maintenance tests are strictly time-based (e.g., annually or every 2 years) or condition-based.
B is correct — Maintenance tests are systematic, recurring evaluations conducted throughout the service life of electrical equipment to ensure safety and reliability.
Always remember: Factory Acceptance Tests (FAT) verify design compliance, while Maintenance tests verify ongoing performance integrity.