The electrical signal is a combination of voltage and current. To understand the voltage and current in simple terms let’s suppose voltage as a ‘force’ and current as a ‘mass’. Now it is a universal rule that no mass moves by itself, a force must be applied to it. Same is the case with the current and the voltage, voltage is actually the force, the push that current (flow of electrons) need to start moving in a particular direction within a circuit. Power as a term is actually a combination of electric current ‘I’ and voltage ‘V’. Power losses are referred to as different losses that the cable undergoes during the flow of electric current when a certain voltage is being applied to it.
Power losses in cable occur due to the resistance offered to the flow of electric current. The resistance could either be offered by the conductor or by insulating material covering it. Due to this resistance, heat is produced which is directly proportional to the square of the current. It means higher the current, higher the resistance and higher the power losses among the cable.
Corona Losses is also another type of power loss occurring in electrical cables.
Corona losses are usually referred to as high power losses. At high voltage system, the current that pass through the conductor ionizes the air close to the conductor. This ionized air actually increases the size of the conductor resulting in high power loss. This corona discharge is actually an electrical discharge that forms an electric field around the conductor. If this electric field is properly limited to a certain area, then corona losses could be minimized. Because this is actually a leakage current loss so if it remains in a certain region then only it is hazardless otherwise, it could do damages to the conductor and surrounding materials.