Abstract
When designing dowstep substations, the designer is forced to perform a large volume of routine calculations. These calculations require the designer to be able to navigate in a large volume of regulatory documents, instructions and GOST, as well as catalogs of manufacturers of electrical equipment. The use of CAD for this purpose significantly reduces the time spent by the designer on the part of the project. However, existing CAD either automate one or several stages of the project or are based on norms and standards not in force in the Russian Federation. The authors of this paper have developed an algorithm of automated selection and checking of rigid buses of rectangular cross-section made from one strip. The algorithm described in the work allows to select the section of the bus according to the condition of its heating with the heavy mode current, as well as to carry out its check for thermal and electrodynamic withstand. The algorithm is characterized by the presence of a mathematical description of the nomogram of the dynamic coefficient, which reduces the possibility of error in its definition and greatly facilitates the work of the designer. The algorithm is based on the current guidelines for calculation of short-circuit currents and selection of electrical equipment. The developed algorithm is implemented in the original CAD of downstep substations, in which the database of electrical equipment is integrated. This approach automates the development of the project in complex. When selecting electrical equipment in this CAD, the designer at any stage has access to the database only those sets and conductors that satisfy the conditions of their operation in prolonged and emergency modes.
Keywords
Computer-aided design, thermal withstand, electrodynamic withstand, busbars, switchgear, substation.
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