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Examoogle • User • info@examoogle.com • EE-2024-8821
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Activities done in hot line maintenance.
Inspection of insulator
Wash the insulators
To tighten the joints
All of these
All of these
Quick Summary: Hot line maintenance refers to the practice of performing maintenance, repair, or inspection on live electrical power systems without de-energizing the equipment. This is essential for maintaining power supply continuity and is performed using specialized tools and safety gear.
Hot line maintenance refers to the practice of performing maintenance, repair, or inspection on live electrical power systems without de-energizing the equipment. This is essential for maintaining power supply continuity and is performed using specialized tools and safety gear.
Vd=Erms×sin(ωt) — Instantaneous voltage of the transmission line
Dmin∝Vphase — Minimum approach distance is proportional to line voltage
The principle relies on maintaining the integrity of the insulating distance between the live conductor and the worker, known as the Minimum Approach Distance (MAD). Workers use insulated sticks (hot sticks) or robotic arms to ensure that the dielectric strength of the air gap remains sufficient to prevent flashovers while interacting with the energized component.
Hot line maintenance eliminates the need for planned shutdowns, improving system availability.
Requires specialized training and use of non-conductive tools (fiberglass or epoxy-resin).
Essential to monitor ambient humidity and contamination levels before starting work.
Insulator washing prevents the accumulation of conductive dust/salt which leads to leakage current.
Ensures continuous power supply to consumers
Reduces revenue loss due to downtime
Increases grid reliability index
Extremely high risk of electrical shock
Requires expensive specialized equipment
Highly dependent on weather conditions (humidity/wind)
Transmission line tower hardware replacement
Distribution insulator cleaning in polluted areas
Installation of bird guards and line spacers
Minimum approach distance is governed by OSHA or IEEE 516 standards depending on the voltage level.
Option B (Washing) is specifically vital in coastal or industrial regions where salt or carbon deposits create a leakage path (Ileakage=V/Rsurface).
D is correct — All listed activities, including inspection, insulator cleaning, and hardware maintenance, are critical tasks performed while the electrical system remains in an energized state.
Always remember that safety in live-line maintenance is governed by the 'Dielectric Path' concept—if the tool/insulator resistance is high enough, the leakage current is kept below the threshold of human perception.