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Extra info for Analysis and Design of Low-Voltage Power Systems: An Engineer's Field Guide
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. Short circuit current: When a short circuit arises on the secondary side of a transformer during operation, the peak short circuit current ip will first flow.
4. The protective measures (TN or TT system) are known. 5. The installed total effective and reactive powers must be calculated. 6. The operating current is calculated from the total effective power. 7. The cross-section of the feeder line is calculated, considering the type of cable installation and the voltage drop. 8. The main fuse or circuit breaker is determined from the cabling selected. 9. For the calculation of short circuit currents it is necessary to determine the impedances of the individual lines and cables.
5. It is therefore possible to calculate the cross-section of the main line,the short circuit currents and the voltage drops. Case II: 1. The source impedance of the source network and the length up to the feed-in of the main distribution are known. 2. The consumer data are known and are drawn in on the planimetric map. 3. The coincidence factor is given. 4. The protective measures (TN or TT system) are known. 5. The installed total effective and reactive powers must be calculated. 6. The operating current is calculated from the total effective power.