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Additional info for Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide
Cable list The cable list shows the cable number, type, cross-section, voltage, number of cores, interconnections of grounding electrodes. 5 6 2 Planning and Project Management 13. Weak current systems Weak current systems, such as intercom, telephone and fire alarm systems, must be shown on separate installation diagrams. 14. Material lists Material lists include all documentation for the quality of the electrical material and for the specification of installations as described in the project.
The short circuit losses are made up of the ohmic losses in the windings and losses due to leakage fields. They are proportional to the square of the loading. Oil-filled transformers and cast resin dry-type transformers are preferred; the use of askarel transformers is forbidden. In this section, the most important criteria for the selection of distribution transformers in the power range from 50 to 2500 kVA for supplying power to lowvoltage networks will be discussed. 1. 2. 3. 4. 5. g. 19 Interior installation of liquid-filled transformers  The installation of transformers should be free of underground water and flooding.
The no-load current I0 is made up of the current Il and the active current component IR (heat losses). 10). This is used to measure the short circuit losses. The short circuit voltage is important for the determination of ± the impedance ± the winding power loss ± the phase shift ± the short circuit current ± the arrangement of transformers in parallel Mostly uk is given as the relative short circuit voltage in percent of the primary voltage. It is a measure of the loading when a change of voltage occurs.
Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide by Ismail Kasikci