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The operating voltage of Extra high tension cable is upto
11 kV 11kV
33 kV 33KV
66 kV 66KV
Above 66 kV Above 66KV
66 kV
66KV
Extra High Tension (EHT) cables are specifically designed for transmission and distribution systems operating in the voltage range of 33 kV to 66 kV. In the classification of power cables based on voltage levels, the EHT category specifically covers the range up to 66 kV, beyond which cables are classified as Extra Super Voltage cables.
Extra High Tension (EHT) cables are specifically designed for transmission and distribution systems operating in the voltage range of 33 kV to 66 kV. In the classification of power cables based on voltage levels, the EHT category specifically covers the range up to 66 kV, beyond which cables are classified as Extra Super Voltage cables.
Emax=rln(R/r)V — Electric field stress at the conductor surface in a single-core cable
The classification of cables is determined by the insulation thickness and the dielectric strength required to prevent puncture at specific operating voltages. As voltage levels increase, the capacitive stress on the cable insulation increases, requiring sophisticated grading and specialized materials like cross-linked polyethylene (XLPE) or oil-impregnated paper insulation to manage electric field stress (E=rln(R/r)V).
LT Cables: Rated up to 1 kV.
HT Cables: Rated from 1.1 kV up to 11 kV.
ST Cables: Rated from 22 kV up to 33 kV.
EHT Cables: Rated from 33 kV up to 66 kV.
Extra Super Voltage Cables: Rated above 66 kV up to 132 kV and beyond.
Reduced line losses at higher voltages
Higher power transfer capability for the same cross-sectional area
High dielectric losses at elevated voltages
Complexity in cable jointing and termination
Sub-transmission systems in urban areas
Power evacuation from large generating stations to substations
The classification is standard practice in Indian electrical engineering curricula (e.g., J.B. Gupta or V.K. Mehta texts).
Option A is categorized as High Tension, Option B as Super Tension, and Option D falls into Extra Super Voltage.
C is correct — Extra high tension (EHT) cables are defined by their operating range of up to 66 kV.
Always verify cable ratings based on Indian Standard (IS) classifications rather than global international standards, as exam questions often prioritize standard textbook definitions used in Indian engineering competitive exams.