ABSTRACT: According to experimental results, the temperature on a horizontally curved conductor proved to be higher than that on a straight conductor. The temperature deviation increased with the current ratio I/I<sub>cr</sub> increasing or the curved angle α and curved radius R<sub>0</sub> decreasing, where I<sub>cr</sub> is the critical melting current. In a previous paper, the critical melting current I<sub>cr</sub> of horizontal, straight copper conductors in the air can be expressed by the following equation: I<sub>cr</sub> = 2.21 × 10<sup>3</sup> D<sup>1.505</sup> (A) (1) (70 A ≤ I<sub>cr</sub> ≤ 2500 A, 0.1 cm ≤ D ≤ 1 cm, D-diameter). Therefore, if the maximum surface temperature is settled for conductors of the same diameter and manufactured of the same material, the current conducted by a curved conductor was smaller than that conducted by a straight one. When the curved angle α was ∠45° and current ratio I/I<sub>cr</sub> was 38.5%, the current decrease deviation was approximately 10%.
IEEE Transactions on Power Delivery 11/2002; · 1.35 Impact Factor