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- Per-unit_system abstract "In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other. This can be a pronounced advantage in power system analysis where large numbers of transformers may be encountered. Moreover, similar types of apparatus will have the impedances lying within a narrow numerical range when expressed as a per-unit fraction of the equipment rating, even if the unit size varies widely. Conversion of per-unit quantities to volts, ohms, or amperes requires a knowledge of the base that the per-unit quantities were referenced to.The main idea of a per unit system is to absorb large difference in absolute values into base relationships. Thus, representations of elements in the system with per unit values become more uniform.A per-unit system provides units for; power, voltage, current, impedance, and admittance. Except impedance and admittance, any two of these are independent and can be arbitrarily selected as base values, usually power and voltage. All quantities are specified as multiples of selected base values. For example, the base power might be the rated power of a transformer, or perhaps an arbitrarily selected power which makes power quantities in the system more convenient. The base voltage might be the nominal voltage of a bus. Different types of quantities are labeled with the same symbol (pu); it should be clear from context whether the quantity is a voltage, current, etc.Per-unit being used in power flow, short circuit evaluation and motor starting studies, it is important for all power engineers to be familiar with the concept.".
- Per-unit_system wikiPageExternalLink Industrial_power_systems_handbook.html?id=zOgiAAAAMAAJ.
- Per-unit_system wikiPageExternalLink books?id=U77A2C37QesC&dq=power+system+analysis+and+design&source=gbs_navlinks_s.
- Per-unit_system wikiPageID "610773".
- Per-unit_system wikiPageLength "18169".
- Per-unit_system wikiPageOutDegree "23".
- Per-unit_system wikiPageRevisionID "701607297".
- Per-unit_system wikiPageWikiLink AC_power.
- Per-unit_system wikiPageWikiLink Admittance.
- Per-unit_system wikiPageWikiLink Busbar.
- Per-unit_system wikiPageWikiLink Category:Electric_power.
- Per-unit_system wikiPageWikiLink Category:Electrical_engineering.
- Per-unit_system wikiPageWikiLink Category:Power_engineering.
- Per-unit_system wikiPageWikiLink Copper_loss.
- Per-unit_system wikiPageWikiLink Electric_current.
- Per-unit_system wikiPageWikiLink Electric_power.
- Per-unit_system wikiPageWikiLink Electric_power_system.
- Per-unit_system wikiPageWikiLink Electrical_engineering.
- Per-unit_system wikiPageWikiLink Electrical_impedance.
- Per-unit_system wikiPageWikiLink Motor_soft_starter.
- Per-unit_system wikiPageWikiLink Ohms_law.
- Per-unit_system wikiPageWikiLink Power-flow_study.
- Per-unit_system wikiPageWikiLink Power_engineering.
- Per-unit_system wikiPageWikiLink Short_circuit.
- Per-unit_system wikiPageWikiLink Single-phase_electric_power.
- Per-unit_system wikiPageWikiLink Three-phase.
- Per-unit_system wikiPageWikiLink Transformer.
- Per-unit_system wikiPageWikiLink Voltage.
- Per-unit_system wikiPageWikiLinkText "Per-unit system".
- Per-unit_system wikiPageWikiLinkText "per-unit system".
- Per-unit_system wikiPageWikiLinkText "per-unit".
- Per-unit_system wikiPageUsesTemplate Template:Cite_book.
- Per-unit_system wikiPageUsesTemplate Template:Cite_conference.
- Per-unit_system wikiPageUsesTemplate Template:Cite_journal.
- Per-unit_system wikiPageUsesTemplate Template:Reflist.
- Per-unit_system subject Category:Electric_power.
- Per-unit_system subject Category:Electrical_engineering.
- Per-unit_system subject Category:Power_engineering.
- Per-unit_system hypernym Expression.
- Per-unit_system type Organisation.
- Per-unit_system type Discipline.
- Per-unit_system comment "In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other. This can be a pronounced advantage in power system analysis where large numbers of transformers may be encountered.".
- Per-unit_system label "Per-unit system".
- Per-unit_system sameAs Q1852883.
- Per-unit_system sameAs Per-Unit-System.
- Per-unit_system sameAs Sistema_por_unidad.
- Per-unit_system sameAs سیستم_پریونیت.
- Per-unit_system sameAs Unité_réduite.
- Per-unit_system sameAs Sistema_por_unidade.
- Per-unit_system sameAs m.02w9dl.
- Per-unit_system sameAs Система_относительных_единиц.
- Per-unit_system sameAs Q1852883.
- Per-unit_system wasDerivedFrom Per-unit_system?oldid=701607297.
- Per-unit_system isPrimaryTopicOf Per-unit_system.