Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Single circuit, double circuit, narrow/broad base single circuit and Cast head single circuit with two/four sub conductor are the type of ______________
LTPoles
HTTransmission Line (Steel Tower)
LTConductor
HTConductor
HTTransmission Line (Steel Tower)
Transmission towers (steel lattice structures) are categorized based on their circuit configuration, tower geometry, and sub-conductor arrangement. Terms like single circuit, double circuit, narrow/broad base, and cast head single circuit with multi-sub-conductors define structural designs used to support high voltage phase conductors.
IS 802 (Part 1/Sec 1):1995
Transmission towers (steel lattice structures) are categorized based on their circuit configuration, tower geometry, and sub-conductor arrangement. Terms like single circuit, double circuit, narrow/broad base, and cast head single circuit with multi-sub-conductors define structural designs used to support high voltage phase conductors.
EgтАЛ=rln(D/r)VтАЛ тАФ maximum electric stress on conductor surface
L=2├Ч10тИТ7ln(rтА▓DтАЛ)┬аH/m тАФ self-inductance of overhead line conductor
High Voltage (HT) Transmission Lines use steel lattice towers to maintain required ground clearance, phase-to-phase separation, and support mechanical loads (wind, ice, line tension). Multi-sub-conductor arrangements (bundle conductors with two or four sub-conductors) reduce corona discharge loss and surge impedance by decreasing the maximum surface voltage gradient on the phase conductors.
Single circuit towers carry 3 phase conductors (1 circuit), while double circuit towers carry 6 phase conductors (2 circuits) on a single structure.
Narrow base towers are used where space/right-of-way (RoW) is constrained; broad base towers provide greater structural stability for heavy line loads.
Bundled sub-conductors (2 or 4 sub-conductors per phase) are standard for EHV/UHV lines to reduce Corona power loss.
High mechanical strength to withstand extreme environmental wind and ice loads.
Higher power transmission capacity with double circuit and bundled conductor arrangements.
High capital cost and significant Right-of-Way (RoW) requirements for broad base towers.
Susceptible to structural failure during severe windstorms or tower galloping if under-designed.
High Voltage (HT) and Extra High Voltage (EHV) AC/DC overhead transmission lines.
Power transmission from generating stations to regional grid substations over long distances.
Low Tension (LT) lines typically operate below 1┬аkV and utilize RCC, PCC, or wooden poles instead of steel lattice towers.
Option A and C refer to LT equipment which do not utilize complex lattice structures or quad sub-conductors.
Option D specifies only the conductor, whereas the term 'cast head single circuit' specifically describes tower steel structural configurations.
B is correct тАФ These structural designs specifically classify High Tension (HT) transmission line steel lattice towers used to carry transmission circuits and sub-conductors.
Always distinguish between LT distribution supports (PCC/RCC/Tubular poles) and HT/EHV transmission supports (Steel Lattice Towers) based on voltage level, base width, and circuit configuration.