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$Per unit system calculation examples pdf: >> http://tgf.cloudz.pw/download?file=per+unit+system+calculation+examples+pdf << (Download) Per unit system calculation examples pdf: >> http://tgf.cloudz.pw/read?file=per+unit+system+calculation+examples+pdf << (Read Online) single line diagram and per unit impedance/reactance diagram per unit impedance diagram of power system single line and reactance diagram of power system and per unit 3 phase per-unit calculations introduction to per unit calculations per unit system nptel per unit system – practice problem solved for easy understanding per unit system ppt 2 Oct 2012 Per Unit Quantity. Base Value. Change of Base. Steps of Calculation. 2/10/2012. 4. EE2022: Transformer and Per Unit Analysis by P. Jirutitijaroen Example 1. • Consider a single phase 480/120 V transformer. – Choose the base value of voltage on the primary side to be. 480 and that of secondary side to example of scaling. However if the scaling is done on a logical basis one can have a simple representation of the parameters without the bother of the scaling factors. In the case of power system a common base value is adopted base values are identified the per unit values are calculated for any parameter by dividing. 9 Feb 2016 per unit quantity = For example, a transmission system operating at 117,300 volts with a nominal base rating of 115,000 volts has a per-unit voltage For equipment such as motors, generators, and transformers, the base power rating and voltage are typically used to calculate a per-unit impedance. Though the type of transformer in 3-phase system, determine the ratio of voltage bases, the p.u. impedance is the same irrespective of the type of 3-phase transformer. (Yc D , D c Y, D c D , or Yc Y) 8. Per-unit method allows the same basic arithmetic operation resulting in per-phase end values, without having to worry about Per unit notation. ? In per unit notation, the physical quantity is. In per unit notation, the physical quantity is expressed as a fraction of the reference value, i.e. va ue, .e. per unit Example 1. ? Given V = 100?30o. Given V 100?30. Z = 3 + j4 = 5?53.1o ?. ? Fi d t. ? Find current active, reactive, & apparent power power factor. 22 Jan 2017 by the equation: Quantity per unit (pu) = Actual value. Base value of quantity. We select two base quantities to define a given per-unit system. Usually we Example: An electrical lamp is rated 120 volts, 500 watts. Compute the per-unit and percent impedance of the lamp. Give the p.u. equivalent circuit. construction of device while the per-unit system is employed. Per-Unit System for Single-Phase Transfomers. The voltages, currents, powers, impedances, and other electrical quantities are measured as fractions of some base level instead of conventional units. actual value. Quantity per unit base value of quantity. = Usually per unit calculation. Subject lecturer: Dr. XU Zhao. Department of Electrical Engineering. Hong Kong Polytechnic University. Email: eezhaoxu@polyu.edu.hk. R. CF632. Room: CF632 first AC system using transformer at Great Barrington in . •Example: Calculate the primary voltage and current for an impedance load. phase analysis of symmetrical three phase systems, general$