The option PU/MVA -> indicates that the actual impedance and current limits will be converted to per unit impedance and MVA limits when the length value is changes. The option When changing convert is used to convert the values when the length value is modified. This value indicates the length of the line in miles or kilometers, depending on the units selected in Length Units. If any of these values is modified, the corresponding per unit or MVA value will be changed accordingly, taking into consideration the current line length, length units, and system base values. This part of the dialog shows all the impedance related values in Ohms/length-unit as well as the transmission line limits specified in Amps. The Line Per Unit Impedance Calculator Dialog allows to convert actual impedance and current limit values to per unit impedance and MVA limit values, and vice versa. Line Per Unit Impedance Calculator Dialog
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