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01a SR Principle
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7/18/2019 01a SR Principle
http://slidepdf.com/reader/full/01a-sr-principle 1/14
PSDPSD--FTPFTP 11
Power SystemPower System – – Fast TrainingFast Training
ProgramProgram
Inst. Ahmed M.Inst. Ahmed M.
A/Hafeez A/Hafeez
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PSDPSD--FTPFTP 22
SR4 PrincipleSR4 PrincipleT0T0 T1T1 T2T2 T3T3
Field
L3
L4
Stator
Diode
L1
Field
L2
Armature
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PSDPSD--FTPFTP 33
T0T0 T1T1 T2T2 T3T3
Field
L3
L4
Stator
Diode
L1
Field
L2
Arm ature
T0T0 T1T1 T2T2 T3T3
Field
L3
L4
Stator
Diode
L1
Field
L2
Arm atur e
Self exitedSelf exited
Remaining magnetismRemaining magnetism
PermanentPermanent
magnetmagnet
Permanent magnetismPermanent magnetism
L5L5
Self exited or Permanent magnetSelf exited or Permanent magnet
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PSDPSD--FTPFTP 44
L4L4
L3L3
--
L2L2
L1L1
RFARFA
T0T0 T1T1 T2T2 T3T3
FieldL3
L4
Stator
Diode
L1
Field
L2
Arm ature
Self exited schematicSelf exited schematic
++
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If the generator rotating field (L3) or the exciterIf the generator rotating field (L3) or the exciter
field (L1) have a loss of residual magnetism thefield (L1) have a loss of residual magnetism themagnetism can be put back bymagnetism can be put back by flashingflashing the exciterthe exciterfield winding with a direct current source.field winding with a direct current source.
DYNAMIC FLASHINGDYNAMIC FLASHING
(ENGINE RUNNING)(ENGINE RUNNING)With the engine stopped , connect a voltmeter to terminal 20 andWith the engine stopped , connect a voltmeter to terminal 20 and
22 . Connect the22 . Connect the positivepositive
cable ofcable ofthe DC source to terminalthe DC source to terminal F1.F1. Start the engine and run at low idle rpm . Put theStart the engine and run at low idle rpm . Put the negativenegative
cable ofcable ofthe DC source on terminalthe DC source on terminal F2F2
while reading the voltmeter. AS SOON AS THE VOLMETER HASwhile reading the voltmeter. AS SOON AS THE VOLMETER HASAND INDICATION OF VOLTAGE, REMOVE THE NEGATIVE CABLE FROM TERMINAND INDICATION OF VOLTAGE, REMOVE THE NEGATIVE CABLE FROM TERMINAL F2AL F2
STATIC FLASHINGSTATIC FLASHING
(ENGINE STOPPED)(ENGINE STOPPED)With the engine stopped , disconnect exciter filed (L1) wires fWith the engine stopped , disconnect exciter filed (L1) wires from terminal F1 and F2 of therom terminal F1 and F2 of thevoltage regulator. Connect the positive cable of the DC source tvoltage regulator. Connect the positive cable of the DC source to wire F1 and negative too wire F1 and negative towire F2 for NO MORE THAN ONE OR TWO SECONDS. Repeat 2 or three twire F2 for NO MORE THAN ONE OR TWO SECONDS. Repeat 2 or three t imes.imes.
According to theory this method has the effect of putting residuAccording to theory this method has the effect of putting residual magnetism back in theal magnetism back in theexciter.exciter.
Flashing the fieldFlashing the field
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Permanent magnet schematicPermanent magnet schematicT0T0 T1T1 T2T2 T3T3
Field
L3
L4
Stator
Diode
L1
Field
L2
Arm ature
L5L5
L4
++L3L3 --
L2L2
L1L1
RFARFA
L5L5
S
N
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Now comingNow coming …………. AREP PRINCIPLE. AREP PRINCIPLE
STATOR
WINDING
ALTERNATING
CURRENTDIRECT
CURRENT
ROTOR
WINDING
RECTIFIERSEXCITER FIELD
AVR
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Rectifier blockRectifier block
AC2
AC1 AC3
CR1
CR2
CR3
CR4
CR7
CR5
CR6
VaristorVaristor
AC -+
A C
-
+
AC -+
CR7CR7
AC3
AC2
AC1
+-
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DIODESDIODES
i
i
V+V-
I+
I -
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AC2
AC1 AC3
CR1
CR2
CR3
CR4
CR7
CR5
CR6
Time
Rectifier Rectifier blockblock
-+-
- ++
Voltage
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Zener Zener diodediode
V+V-
I+
I -
Also called Surge suppression diode, is used to
protect the rectifier from high reverse voltage
pulses.
-+
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AC3
AC2
AC1
+-
1-
Multimeter
on range
2-
Remove all wires from block
5-Black test lead on Neg..Neg..
terminal
AC1Red lead on AC2
AC3
Measure OL
4-
Reverse leads : Measure OL
on all position
6-
Varistor
test: Measure resistance between Pos. & Neg. : Measure 15K or more
3-Black
test lead on Pos.Pos.
terminal
AC1Red lead on AC2
AC3
Measure between
0.4 & 1.0 volt
Rectifier block testRectifier block test
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SoSo……we have the generator and the exciter we have the generator and the exciter …….what else we need?.what else we need?
T0T0 T1T1 T2T2 T3T3
FieldL3
L4
Stator
Diode
L1
Field
L2Armature
Output Voltage controlOutput Voltage control…………..Voltage regulator ..Voltage regulator
Output frequency controlOutput frequency control…………..Speed governor ..Speed governor
Monitor ing and securit iesMonitoring and securities
……control panels, relays,control panels, relays,
etcetc
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