Modelica.Electrical.Machines.Examples.Transformers

Test examples of transformers

Information

This package contains test examples of DC machines.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
TransformerTestbench	Transformer Testbench
AsymmetricalLoad	AsymmetricalLoad
Rectifier6pulse	6-pulse rectifier with 1 transformer
Rectifier12pulse	12-pulse rectifier with 2 transformers
AIMC_Transformer	Test example: AsynchronousInductionMachineSquirrelCage transformer starting

Modelica.Electrical.Machines.Examples.Transformers.TransformerTestbench

Transformer Testbench

Information

Transformer testbench:

You may choose different connections as well as vary the load (even not symmetrical).

Please pay attention to proper grounding of the primary and secondary part of the whole circuit.
The primary and secondary starpoint are available as connectors, if the connection is not delta (D or d).

In some cases it may be necessary to ground the transformer's starpoint even though the source's or load's starpoint are grounded:

Yy ... Grounding of transformer's primary or secondary starpoint with reasonable high earthing resistance is necessary.
Yd ... No grounding necessary.
Yz ... Grounding of transformer's primary starpoint with reasonable high earthing resistance is necessary.
Dy ... No grounding necessary.
Dd ... No grounding necessary.
Dz ... No grounding necessary.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

RL[3] Load resistance [Ohm]

transformerData

Name	Description
RL[3]	Load resistance [Ohm]
transformerData

Modelica.Electrical.Machines.Examples.Transformers.AsymmetricalLoad

AsymmetricalLoad

Information

Asymmetrical (singlephase) load:

You may choose different connections.

In some cases it may be necessary to ground the transformer's starpoint even though the source's or load's starpoint are grounded:

Yy with primary starpoint connected to source's starpoint: primary current in only one phase
Yy primary starpoint not connected to source's starpoint: secondary voltage breaks down
Yz ... Grounding of transformer's primary starpoint with reasonable high earthing resistance is necessary.
Dy ... Load current in two primary phases.
Dz ... Load current in three primary phases.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

RL Load resistance [Ohm]

transformerData

Name	Description
RL	Load resistance [Ohm]
transformerData

Modelica.Electrical.Machines.Examples.Transformers.Rectifier6pulse

6-pulse rectifier with 1 transformer

Information

Test example with multiphase components:
Star-connected voltage source feeds via a transformer a diode bridge rectifier with a DC burden.
Using f=50 Hz, simulate for 0.1 seconds (5 periods) and compare voltages and currents of source and DC burden, neglecting initial transient.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

V Amplitude of star-voltage [V]

f Frequency [Hz]

RL Load resistance [Ohm]

C Total DC-capacitance [F]

VC0 Initial voltage of capacitance [V]

transformerData1

Name	Description
V	Amplitude of star-voltage [V]
f	Frequency [Hz]
RL	Load resistance [Ohm]
C	Total DC-capacitance [F]
VC0	Initial voltage of capacitance [V]
transformerData1

Modelica.Electrical.Machines.Examples.Transformers.Rectifier12pulse

12-pulse rectifier with 2 transformers

Information

Test example with multiphase components:
Star-connected voltage source feeds via two transformers (Dd0 and Dy1) two diode bridge rectifiers with a single DC burden.
Using f=50 Hz, simulate for 0.1 seconds (5 periods) and compare voltages and currents of source and DC burden, neglecting initial transient.

Extends from Machines.Examples.Transformers.Rectifier6pulse (6-pulse rectifier with 1 transformer).

Parameters

Name Description

V Amplitude of star-voltage [V]

f Frequency [Hz]

RL Load resistance [Ohm]

C Total DC-capacitance [F]

VC0 Initial voltage of capacitance [V]

transformerData1

transformerData2

Name	Description
V	Amplitude of star-voltage [V]
f	Frequency [Hz]
RL	Load resistance [Ohm]
C	Total DC-capacitance [F]
VC0	Initial voltage of capacitance [V]
transformerData1
transformerData2

Modelica.Electrical.Machines.Examples.Transformers.AIMC_Transformer

Test example: AsynchronousInductionMachineSquirrelCage transformer starting

Information

Test example: Asynchronous induction machine with squirrel cage - transformer starting
At start time tStart1 three phase voltage is supplied to the asynchronous induction machine with squirrel cage via the transformer; the machine starts from standstill, accelerating inertias against load torque quadratic dependent on speed; at start time tStart2 the machine is fed directly from the voltage source, finally reaching nominal speed.
Simulate for 2.5 seconds and plot (versus time):

currentQuasiRMSSensor.I: stator current RMS
aimc.wMechanical: motor's speed
aimc.tauElectrical: motor's torque

Default machine parameters of model AIM_SquirrelCage are used.

Extends from Machines.Examples.AsynchronousInductionMachines.AIMC_Transformer (Test example: AsynchronousInductionMachineSquirrelCage transformer starting).

Parameters

Name Description

VNominal Nominal RMS voltage per phase [V]

fNominal Nominal frequency [Hz]

tStart1 Start time [s]

tStart2 Start time of bypass transformer [s]

TLoad Nominal load torque [N.m]

wLoad Nominal load speed [rad/s]

JLoad Load's moment of inertia [kg.m2]

transformerData

aimcData

Name	Description
VNominal	Nominal RMS voltage per phase [V]
fNominal	Nominal frequency [Hz]
tStart1	Start time [s]
tStart2	Start time of bypass transformer [s]
TLoad	Nominal load torque [N.m]
wLoad	Nominal load speed [rad/s]
JLoad	Load's moment of inertia [kg.m2]
transformerData
aimcData

Automatically generated Mon Sep 23 17:20:29 2013.