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 ÷
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 ÷
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