Transcript Slide 1

RE1345
KONVERSI TENAGA LISTRIK II
Vita Lystianingrum
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RE1345 KONVERSI TENAGA LISTRIK II
SILABUS
RE1345 Konversi Tenaga Listrik II
Electrical Power Conversion II
Semester IV
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SKS
Tujuan:
Memahami tentang dasar-dasar mesin listrik arus bolak-balik, khususnya: generator
serempak, motor serempak, motor tak serempak.
Prasyarat:
Konversi Tenaga Listrik I
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RE1345
KONVERSI TENAGA LISTRIK II
1: Klasifikasi mesin-mesin listrik dan konstruksi
2: Generator sinkron: proses terbangkitnya EMF dan macam-macam
generator sinkron
3: Generator sinkron: berbeban, kerugian tegangan, diagram vektor
untuk pf. lagging, pf. leading
4: Generator sinkron: menentukan voltage regulator dengan metode
EMF dan karakteristik
5: Generator sinkron: kerja paralel
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7: Motor sinkron: metode start dan pengaruh perubahan arus eksitasi
8: Motor sinkron: torque dan contoh soal
9 & 10:
UTS
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References
1. Theraja, B. L., ‘Electrical Technology’, S. Chand
& Company Ltd., 1978.
2. Karady, G., ‘Lecture Notes on Synchronous
Generator’,
www.eas.asu.edu/~karady/360_pp.html.
3. Zuhal
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• Motivasi, Tujuan:
– Menambah wawasan?
• MAteri kuliah bisa didownload di: www.oc.its.ac.id
• Komposisi Nilai
– Tugas
– UTS
– UAS
20 %
40 %
40 %
• Peraturan Kelas
– Kelas dimulai jam 7.30
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Review KTL 1:
DC Machines
• Generators convert mechanical energy to electric energy.
• Motors convert electric energy to mechanical energy.
• Faraday’s Law
-> Dynamically & statically induced.
• The construction of motors and generators are similar.
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DC generator
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DC generator
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DC Motor Parts
carbon brushes
Field magnet
rotor
stator
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AC Generators / Alternators
• Same principles as DC generators ->
armature winding & magnetic field.
• Armature winding -> stator
field winding -> rotor
**
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Why stationary armature?
• Without brush contact->
The output current can be led directly from fixed terminals
on the stator (armature windings) to the load circuit.
• Easier to insulate stationary armature winding for high AC
voltages (may be as high as 30 kV or more)
• Sliding contacts i.e. slip-rings are transferred to the lowvoltage, low-power DC field circuit-> easily insulated
• **Armature windings can be more easily braced to prevent
any deformation produced by the mechanical stresses
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SYNCHRONOUS MACHINES
Housing ,cooling ducts
Stator
Rotor
Shaft
Bearing
Rotor winding
Stator winding
Connections
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SYNCHRONOUS MACHINES
Stator
• Laminated iron
core with slots
• Steel Housing
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SYNCHRONOUS MACHINES
Iron core
Stator details
• Coils are placed in
slots
Coil
Slots
• Coil end windings
are bent to form the
armature winding.
End winding
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**2 kinds of rotor
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SYNCHRONOUS MACHINES
Round rotor
Steel ring
Shaft
Wedges
DC current terminals
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SYNCHRONOUS MACHINES
Rotor Details
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SYNCHRONOUS MACHINES
Round rotor
Round rotor
•
The round rotor is used
for large high speed
(3600rpm) machines.
•
A forged iron core (not
laminated,DC)
is
installed on the shaft.
•
Slots are milled in the
iron and insulated
copper bars are placed
in the slots.
•
The slots are closed by
wedges and re-enforced
with steel rings.
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SYNCHRONOUS MACHINES
Round Rotor Machine
•
•
•
•
The stator is a ring
shaped laminated ironcore with slots.
Three phase windings
are placed in the slots.
Round solid iron rotor
with slots.
A single winding is
placed in the slots. Dc
current is supplied
through slip rings.
Concept (two poles)
A
Stator with
laminated iron-core
Slots with
winding
B
A
C
-
C
+
+
S
N
Rotor with dc
winding
C
A
-
B
B
-
+
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Salient rotor
• Usually for low- & medium-speed alternators
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SYNCHRONOUS MACHINES
• Concept (two poles)
Salient Rotor Machine
• The stator has a laminated
iron-core with slots and three
phase windings placed in the
slots.
• The rotor has salient poles
excited by dc current.
• DC current is supplied to the
rotor through slip-rings and
brushes.
B-
C+
N
A+
AS
C-
B+
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SYNCHRONOUS MACHINES
• Construction
Construction
•
•
•
•
•
The picture shows the laminated
iron core and the slots (empty
and with winding).
The winding consists of copper
bars insulated with mica and
epoxy resin.
The conductors are secured by
steel wedges.
In large machines, the stator is
liquid cooled.
The iron core is supported by a
steel housing.
empty slots
insulated
winding
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SYNCHRONOUS MACHINES
Salient pole rotor construction
•
•
•
•
The poles are bolted to the shaft.
Each pole has a DC winding.
The DC winding is connected to the slip-rings (not shown).
A DC source supplies the winding with DC through brushes
pressed into the slip ring.
• A fan is installed on the shaft to assure air circulation and
effective cooling.
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SYNCHRONOUS MACHINES
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SYNCHRONOUS MACHINES
Construction
•
Low speed, large hydrogenerators may have more
than one hundred poles.
-> relationship between speed &
poles
•
These
generators
are
frequently mounted vertically.
•
The picture shows a large,
horizontally
arranged
machine.
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• Thank You, see you next week
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• Different construction of synch. Gen
& DC gen ->
• Which one precedes?
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