Comparison of The Methodology for Calculating Short-Circuit Currents Taking into Account Asynchronous Motors

Abstract

This paper discusses the issue of accounting for the effect of asynchronous motors on the short-circuit current if the rated current of the asynchronous motors more than 1.0% of the initial value of the periodic component of the short-circuit current in auxiliary systems of power plants and substations. As an example, the operating VIII - section of the auxiliary system of TPP (Thermal Power Plant) #1 in Dushanbe, the Republic of Tajikistan with nine asynchronous motors. The description of the computational-mathematical model in the ETAP (Electrical Transient Analyzer Program) program is given. With the help of the given model, the standards GOST 28249-93 and IEC 60909 were compared in order to assess their qualities in terms of solving the problem, the difference as a result of the calculation. This technique makes it possible to improve the method of accounting for the effect of asynchronous motors on the short-circuit current.