Electric wire for high frequency, high voltage and large current

An electric wire comprising: a conductive wire, which has substantially a quadrilateral cross-sectional shape; and an insulator placed along a longitudinal direction of the conductive wire at a corner of the quadrilateral; a groove provided along the longitudinal direction of the conductive wire at the corner of the quadrilateral; wherein the insulator is placed in the groove.

An electric wire comprising: a conductive wire having substantially a quadrilateral cross-sectional shape; a groove provided along a longitudinal direction of the conductive wire at each corner of the quadrilateral, wherein an insulator is placed into the groove along the longitudinal direction of said conductive wire; an additional wire, comprising a conductive member, inserted into the conductive wire along the longitudinal direction of said conductive wire, wherein said additional wire is sized to fit into another groove located around a middle point of each sides of said quadrilateral; and an insulator sheath covering entirely an outer surface of the conductive wire, covering all sides and all corners of the quadrilateral, wherein: the conductive wire and the additional wire are made of different materials, and the conductive member is in direct contact with the conductive wire.

An electric wire comprising: a conductive wire having substantially a quadrilateral cross-sectional shape; a groove provided along a longitudinal direction of the conductive wire; an additional wire, comprising a conductive member, inserted into the conductive wire along the longitudinal direction of said conductive wire, said additional wire is sized to fit into the groove so as to fill entirely the groove; an insulator placed along the longitudinal direction of the conductive wire covering entirely an outer surface of said conductive wire, wherein: the conductive wire and the additional wire are made of different materials, the conductive member is in direct contact with the conductive wire, and a ratio of resistance of the conductive wire at a temperature measured between 50° C. to 200° C. to the resistance of conductive wire measured at 50° C. satisfy the following equation: 1≤R≤0.028T+0.86 wherein T is the temperature at which the resistance of said electric wire is measured.

An electric wire comprising: a single conductive wire having substantially a quadrilateral cross-sectional shape; and an insulating layer placed along a longitudinal direction of said single conductive wire, covering at least one corner of said quadrilateral, wherein: a thickness of the insulating layer at the corner is thicker than a thickness of the insulating layer at a side of said quadrilateral, and a resistance of the conductive wire at 200° C. is at most 1.42 times larger than a resistance of the conductive wire at 50° C.