多数の溶接機が接続されている△結線(または V 結線)の三相電源の熱的容量の算定

概要

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Equation (8) shows the general expression of thermal equivalent current for a single phase source when many intermittent loads are connected. In the equation I_1,I_2……are currents, a_1,a_2……are duty cycles and ψ_1,ψ_2……are lagging power factor angles of individual loads. The equation was deduced from equation (3) which shows the instantaneous source current, ε_1,ε_2……being unity or zero (See equ. (2).) whose probabilities of being unity are a_1,a_2.……. Equation (19) shows the result for A phase source of delta-connected three phase system of A, B, C with single phase intermittent loads. The equation was deduced from (12), in which k_a, k_b, k_c are as defined in equ. (13), z_a, z_b, z_c being the internal impedance of source transformers. Equation (20) shows the result when the current, duty cycle and power factor are equal in a given phase, n_A, n_B, n_C being the number of loads. In the case of V-connection, where the C phase source transformer is disconnected, k_a, k_b, k_c in equ. (19) arc given by equ. (24).
1964-02-25