DEVELOPING A METHOD FOR CALCULATING THE INDUCTANCE AND CAPACITANCE OF CONDUCTIVE CORES OF POWER CABLES FOR RATED VOLTAGE OF UP TO 3 kV

The authors develop a method for calculating the inductance and capacitance of conductive cores of power cables. The aim of the work is to carry out a method for calculating inductance and capacitance that would ensure optimal calculation accuracy together with the least labour costs. The main stages of developing a method for calculating inductance and capacitance for one-core, two-core, three-core, four-core and five-core structures of power cables for rated voltages of up to 3 kV are presented. The main difficulty in developing a mathematical model is calculating the average geometric distances between the centres of conductive cores; this problem is especially vital when determining the geometric parameters of sector-shaped conductive cores. Due to their geometric shape, sector-shaped conductive cores are difficult to describe using known mathematical relationships; therefore, a graphical method is applicable to determine the geometric parameters of sector-shaped cores. The authors construct the needed sectors in the KOMPAS-3D program, and measure the required parameters in it. The paper also analyzes the difference in inductance and capacitance values using the example of VVG cable with round and sector cores, constructs comparative graphs, and provides recommendations on the specifics of using the proposed calculation method.