Analysis of Current and Voltage Characteristics of 500 kV Noninverting Parallel Cable

The normal operating current of power cables is an important basis for the development of their protection devices. In order to analyze the operating current and voltage characteristics of parallel cable lines, firstly, the parameter model of non-phase parallel cable routes is established according to the Carson analysis method, the metal sheath is regarded as a general line, and its self-inductance and mutual inductance with the core circuit are considered, and the influence of the sheath circulation is equivalent to the phase impedance matrix of the line through Kron simplification in this process. At the same time, the calculation method of line sequence parameters is explained by phase domain analysis. Establish the Π-type equivalent circuit of the cable line, and calculate the operating parameters of the noninverting parallel cable. The concept of cable route imbalance is introduced, and the operating characteristics of noninverting parallel cables under different arrangement, different loads and core temperatures are compared and analyzed.