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Cable used for 132 kV are
High tension
Super tension
Extra super voltage
Extra high tension
Extra super voltage
Underground power cables are classified based on their voltage operating levels to determine insulation requirements. Cables rated for 132 kV fall into the 'Extra Super Voltage' category, which requires advanced oil-filled or cross-linked polyethylene (XLPE) insulation to handle high electric field stresses.
Underground power cables are classified based on their voltage operating levels to determine insulation requirements. Cables rated for 132 kV fall into the 'Extra Super Voltage' category, which requires advanced oil-filled or cross-linked polyethylene (XLPE) insulation to handle high electric field stresses.
gmaxтАЛ=rln(rRтАЛ)VтАЛ тАФ The maximum potential gradient in a single-core cable at the conductor surface, which governs insulation design at high voltages.
The insulation system for 132 kV cables is designed to manage the high dielectric stress encountered in the radial field. At these voltages, cables are typically of the pressure-cable type, such as oil-filled or gas-pressure cables, which prevent the formation of voids in the insulation that could lead to partial discharge and eventual breakdown.
High Tension (HT): Up to 11 kV
Super Tension (ST): 22 kV to 33 kV
Extra High Tension (EHT): 66 kV
Extra Super Voltage (ESV): 132 kV and above
Extra super voltage cables are exclusively of the pressure type to maintain dielectric integrity.
Reduced transmission loss compared to overhead lines at urban distribution
Invisible and protected from atmospheric hazards
No electromagnetic interference with nearby communication lines
Extremely high initial capital cost
Complex jointing and termination procedures
Difficult to detect and repair faults compared to overhead lines
Sub-transmission and transmission networks in densely populated urban areas
River crossings where overhead lines are impractical
Connecting major substations within industrial complexes
The classification is based on the standard operating range defined by the Bureau of Indian Standards (BIS).
Note: Nomenclature can occasionally vary slightly in older textbooks, but 132 kV is universally categorized as 'Extra Super Voltage'.
C is correct тАФ Cables with a voltage rating of 132 kV are classified as Extra Super Voltage cables.
Always remember that as voltage increases, the dielectric loss and the risk of ionization in air voids become the primary constraints, necessitating the use of pressurized fluid insulation in ESV cables.