Comparison Between Low Voltage (LV) and High Voltage (HV) Power Cables

Comparison Between Low Voltage (LV) and High Voltage (HV) Power Cables

Low Voltage (LV) vs High Voltage (HV) Power Cables

Parameters Low Voltage (LV) Cable High Voltage (HV) Cable
Voltage Range Up to 1 kV (Typically 230V–1000V) Above 33 kV (often 66 kV, 132 kV, 220 kV, 400 kV)
Application Domestic wiring, small industries, internal plant distribution Power transmission over long distances, substations, grid connections
Insulation Type PVC, XLPE (simple layers) XLPE, EPR with multiple insulation and shielding layers
Construction Simple – Conductor, Insulation, Outer Sheath Complex – Conductor, Semi-conductive layers, Insulation, Metallic screen, Outer sheath
Armouring Usually steel wire armoured for mechanical protection Not always used; instead, has metallic screen for electric field control
Testing Requirements Basic insulation resistance and continuity tests Partial discharge, impulse testing, HV withstand, and sheath integrity tests
Size/Weight Smaller diameter, lighter weight Larger diameter, heavier due to insulation and shielding
Installation Easier to install and bend Requires careful handling and trained personnel
Cost Lower Higher due to material and construction complexity
Safety Precautions Standard PPE and safety procedures High-level PPE, insulation monitoring, safety grounding necessary

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