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|Description=<translate><p><center><b>Per unit system calculation examples pdf</b></p>
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<p>vpu = = + = Rpuipu + Lpu = Rpuipu + Lpu VB ZB IB!B LB IBd t!B d t d  Calculation of base quantities for Transformers The various sections of power system works at different voltage levels and the voltage conversion is achieved by means of Per Unit = (Present value) ÷ (base value) Per Unit values are sometimes expressed as a percentage rather than a ratio. In volts: i. Choice of base values in power systems with several zonesPrinciple of ”per unit” system. For example, if the base value of voltage had been selected as, V and the present value is, V, the value of voltage per unit is. To obtain actual voltages from per-unit values, multiply the per-unit values  %PDF %Äåòåë§ó ÐÄÆobj /LengthR /Filter /Flate ode >> stream x µ ËÎäÈq ÷| ® L‰™É+`xá›Ö ÐZnŒ, =6$½?àïDÞÿ*UÁfk ºc’‡ÉÈ¸G  Three-Phase Per Unit Example Solve for the current, load voltage and load power in the previous circuit, assuming a 3fpower base of MVA, and line to line voltage bases of  Converting in per unit a typical dynamic equation. Conversion between different per unit systems. Going from per-unit quantities to actual quantities, or vice versa, is just a rescaling operation. V = kV Three-Phase Per UnitPick a 3fVA base for the entire system,Pick a voltage base for each different voltage level, V B. Voltages are line to lineCalculate the impedance base Procedure is very similar to 1fexcept we use a 3f VA base, and use line to line voltage bases 2, 1)N B B V Z Sf = Exactly the same impedance bases as with %PDF %Äåòåë§ó ÐÄÆobj /LengthR /Filter /Flate ode >> stream x µ ËÎäÈq ÷| ® L‰™É+`xá›Ö ÐZnŒ, =6$½?àïDÞÿ*UÁfk Going from per-unit quantities to actual quantities, or vice versa, is just a rescaling operation. Usual representation of physical quantities as product of numerical value and physical unit, e.g. To obtain actual voltages from per-unit values, multiply the per-unit values with the “base voltage” of each node (/√3 kV for nodes 1,and /√3 kV for nodes 3, 4): VV. V VPU =, ÷, = PU, or. = R i + L d t In per unit: R i L d id ipu d ipu. VPU = () = % PU Introduction of per unit quantities via an example.</p></translate>
|Area=Energy, Machines and Tools, Robotics
|Type=Technique
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|Duration=488
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