If the Greek symbols for alpha beta delta do not appear here the symbol font needs to be installed for correct display of notation and formulae. The symbol font is used for some notation and formulae. So it’s time to move ahead and discuss how you could carry out the calculations and. Not only this, but this free base number calculator will let you apply various arithmetic operations on a couple of numbers in a certain number base system. Note that per-unit and percentage values are related by: An online base calculator with steps lets you convert numbers from one base to another base. The impedance Z 12pu referred to the secondary side, equivalent to an impedance Z 1pu on the primary side, is: The impedance Z 21pu referred to the primary side, equivalent to an impedance Z 2pu on the secondary side, is: Z 1base / Z 2base = (E 1base / E 2base) 2 The primary and secondary MVA ratings of a transformer are equal, but the voltages and currents in the primary (subscript 1) and the secondary (subscript 2) are usually different:Ĭonverting to base (per-phase star) values:ģE 1baseI 1base = S base = 3E 2baseI 2base Note also that Ohm’s Law is satisfied by each of the sets of actual, base and per-unit values for voltage, current and impedance. Note that selecting the base values for any two of S base, E base, I base or Z base fixes the base values of all four. Z base = E base / I base = 3E base 2 / S base ( = E line 2 / S base) I base = S base / 3E base ( = S base / Ö3E line) The multiplier of 2 for some electrical components to account for the. The base values for line current in kA and per-phase star impedance in ohms/phase are: Both line-to-line and line-to-neutral faults are considered. Select rated values as base values, usually rated power in MVA and rated phase voltage in kV: For each system parameter, per-unit value is equal to the actual value divided by a base value:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |