WOLFRAM SYSTEMMODELER

PartialBasicTransformer

Partial model of three-phase transformer

Diagram

Wolfram Language

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SystemModel["Modelica.Electrical.Machines.Interfaces.PartialBasicTransformer"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

Partial model of a three-phase transformer, containing primary and secondary resistances and stray inductances, as well as the iron core. Circuit layout (vector group) of primary and secondary windings have to be defined.
Default values for transformer's parameters (a realistic example) are:
turns ratio n 1
nominal frequency fNominal 50Hz
nominal voltage per phase 100V RMS
nominal current per phase 100A RMS
nominal apparent power 30kVA
primary resistance R1 0.005Ohm per phase at reference temperature
reference temperature T1Ref 20°C
temperature coefficient alpha20_1 01/K
primary stray inductance L1sigma 78E-6H per phase
secondary resistance R2 0.005Ohm per phase at reference temperature
reference temperature T2Ref 20°C
temperature coefficient alpha20_2 01/K
secondary stray inductance L2sigma 78E-6H per phase
operational temperature T1Operational 20°C
operational temperature T2Operational 20°C
These values give the operational parameters:
nominal voltage drop 0.05p.u.
nominal copper losses 300W

Connectors (3)

plug1

Type: PositivePlug

Description: Primary plug

plug2

Type: NegativePlug

Description: Secondary plug

thermalPort

Type: ThermalPortTransformer

Description:

Parameters (14)

m

Value: 3

Type: Integer

Description: Number of phases

n

Value:

Type: Real

Description: Ratio primary voltage (line-to-line) / secondary voltage (line-to-line)

R1

Value:

Type: Resistance (Ω)

Description: Primary resistance per phase at TRef

T1Ref

Value:

Type: Temperature (K)

Description: Reference temperature of primary resistance

alpha20_1

Value:

Type: LinearTemperatureCoefficient20 (¹/K)

Description: Temperature coefficient of primary resistance at 20 degC

L1sigma

Value:

Type: Inductance (H)

Description: Primary stray inductance per phase

R2

Value:

Type: Resistance (Ω)

Description: Secondary resistance per phase at TRef

T2Ref

Value:

Type: Temperature (K)

Description: Reference temperature of secondary resistance

alpha20_2

Value:

Type: LinearTemperatureCoefficient20 (¹/K)

Description: Temperature coefficient of secondary resistance at 20 degC

L2sigma

Value:

Type: Inductance (H)

Description: Secondary stray inductance per phase

useThermalPort

Value: false

Type: Boolean

Description: Enable / disable (=fixed temperatures) thermal port

T1Operational

Value:

Type: Temperature (K)

Description: Operational temperature of primary resistance

T2Operational

Value:

Type: Temperature (K)

Description: Operational temperature of secondary resistance

ni

Value: n * (if C2 == "z" then sqrt(3) else 2) * (if C2 == "d" then 1 else sqrt(3)) / (if C1 == "D" then 1 else sqrt(3))

Type: Real

Description:

Components (7)

powerBalance

Type: PowerBalanceTransformer

Description: Power balance

r1

Type: Resistor

Description:

l1sigma

Type: Inductor

Description:

r2

Type: Resistor

Description:

l2sigma

Type: Inductor

Description:

core

Type: IdealCore

Description:

thermalAmbient

Type: ThermalAmbientTransformer

Description: