Definition of weber-ampere characteristics of electrical devices harmonic balance method in solving inverse problems of diagnostics

The authors have developed a method of determining the weber-ampere characteristics of the electrical alternating current devices based on the method of harmonic balance. However, the use of the polynomial approximation as a power function requires a large number of coefficients, which complicates the task. An arc tangent function has been selected as an approximating weber-ampere characteristic expression in this article, which allows using less power compared with the approximate coefficients of the polynomial, which simplifies the procedure of calculation and reduces the time spent. It is found that the harmonic balance method may be used with this type of approximating expressions to determine the weber-ampere characteristic electrical AC devices with an accuracy of no more than 5%.