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The break times of the individual fuses are read from either the characteristic curves or from IEC 60 364 Parts 61. 14. The selectivity of the overcurrent protection equipment must be determined. 15. All data compiled can then be transferred to the overview, circuit diagrams and the planimetric map. 1 Physical Basis The industrial system with operational equipment depicted in Fig. 4; will now be explained. First we will discuss the transformer. A transformer is an alternating current device, in which electromagnetic induction transfers an alternating voltage and current between two or more windings having the same frequency and in general different values of voltage and current.
4 Principle of switchgear 9 10 3 Electrical Systems For the planning of networks and electrical systems, the total power of the system, the size and number of transformers, the dimensioning of cables and lines, the size and distribution o operating and short circuit currents, operational failures and changes in loads must all be clarified as soon as possible. The thermal and dynamic short circuit currents and the making and breaking capacities of the protective equipment, the contributions of low-voltage motors to the initial symmetrical short circuit current, to the peak short circuit current and to the breaking current, the voltage drop and the system perturbations determine the stability of the system.
Construction details All electrical objects, such as transformers, switchrooms, cable ducts, cutouts and cable and line installation, are shown in their correct locations. 9. Functional descriptions The function of the system, all operating conditions, the number and type of controls in the form of a logic diagram, functional diagram and structogram or equipotential bonding diagram are described in detail. Circuit diagrams can be created on the basis of these. 10. Circuit diagrams A circuit diagram is the detailed representation of a system or circuit with its details.
Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide by Ismail Kasikci