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Per-unit system

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…

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Relationship between units

Single-phaseThree-phaseReactiveApparent powerOhm's law
5 related topics

Overview

Power systems analysisElectrical engineeringPower flowShort circuitMotor starting
12 related topics

Purpose

Numerical stability
1 related topics

Base quantities

Round number
1 related topics

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Overview

Purpose

Base quantities

Relationship between units

In transformers

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Map overview Semantic statistics

Per-unit system

Nodes26
Edges25
Triples30
Avg. degree1.92
Density0.076923
Components1

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Per-unit system

Top relations

related to Base quantities · 10
Per-unit system → All, First, Generally, Hence, If, MVA, Once, Sbase, The, Then
related to Purpose · 8
Per-unit system → Because, It, Manufacturers, Per, Per-unit, Similar, There, Use
related to In transformers · 5
Per-unit system → E1pu, E2pu, For, Here, It
related to Per-unit system formulas · 3
Per-unit system → Beeman's Industrial Power Systems, Handbook, The
is a · 1
Per-unit system → expression of system quantities as fractions of a defined base unit quantity
related to Relationship between units · 1
Per-unit system → The

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Important terminology

base power per-unit system voltage transformer quantities unit values impedance side systems per two analysis units three-phase displaystyle voltages chosen

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Per-unit systemis aexpression of system quantities as fractions of a defined base unit quantity0.90text
a motor or generatorinstance ofThe base power may be the rating of a single piece of apparatus0.80text
10 MVA or 100 MVAinstance ofthe base power is usually chosen as a convenient round number0.80text
Per-unit systemrelated to Base quantitiesGenerally0.60section
Per-unit systemrelated to Base quantitiesThe0.60section
Per-unit systemrelated to Base quantitiesIf0.60section
Per-unit systemrelated to Base quantitiesMVA0.60section
Per-unit systemrelated to Base quantitiesAll0.60section
Per-unit systemrelated to Base quantitiesOnce0.60section
Per-unit systemrelated to Base quantitiesHence0.60section
Per-unit systemrelated to Base quantitiesFirst0.60section
Per-unit systemrelated to Base quantitiesSbase0.60section

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