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Which of the following is generally covered in the general inspection?
Visual inspection of structure and part
spacing between conductors and between conductor and earth
tension on conductor and insulation
All of these
All of these
General inspection of overhead transmission lines is a comprehensive routine maintenance check carried out to ensure structural integrity and electrical safety. It includes visual examination of structural members, measurement of electrical clearances between conductors and earth, and verification of mechanical tension and insulator condition. Hence, option D (All of these) is the correct answer.
IS 5613 (Part 3/Sec 1):1989 & CEA (Measures relating to Safety and Electric Supply) Regulations, 2010
General inspection of overhead transmission lines is a comprehensive routine maintenance check carried out to ensure structural integrity and electrical safety. It includes visual examination of structural members, measurement of electrical clearances between conductors and earth, and verification of mechanical tension and insulator condition. Hence, option D (All of these) is the correct answer.
S=8TwL2тАЛ тАФ Sag formula determining conductor clearance and tension
CminтАЛтИЭV тАФ Minimum electrical clearance proportional to line voltage
Overhead transmission lines are continuously subjected to mechanical stress, environmental weathering, thermal expansion, and electrical stress. Regular inspection detects defects like structural corrosion, mechanical fatigue, conductor sagging (which reduces ground clearance), and insulator degradation before they cause outages or hazards.
General inspection covers structural, electrical, and mechanical parameters.
Ground clearance must comply strictly with Indian Electricity Rules (CEA safety regulations).
Proper tension prevents excessive sag or overstressing during low temperatures.
Visual checks inspect disc insulators for flashover marks, chipping, or pollution deposits.
Prevents catastrophic mechanical failures and tower collapse.
Reduces the likelihood of un-tripped line-to-ground faults due to low ground clearance.
Improves reliability and extends line operating lifespan.
Requires scheduled maintenance downtime or specialized live-line techniques.
Labor-intensive in remote or terrain-difficult Transmission Right-of-Way (RoW).
Routine preventive maintenance of Overhead Transmission Lines.
Pre-commissioning inspection of newly constructed power lines.
Post-storm/monsoon damage assessment.
Option A: Visual inspection checks physical condition of towers, poles, guys, and hardware fittings.
Option B: Spacing checks ensure safety clearances to avoid flashover or short circuits.
Option C: Tension and insulator checks maintain safe sag levels and insulation breakdown resistance.
Since all three options are standard checklist items for maintenance, Option D is correct.
D is correct тАФ General inspection comprehensively checks structural elements, clearances, and conductor/insulator tension.
For CEA safety regulation MCQs, remember that higher line voltage linearly increases required minimum ground and inter-phase clearances.