- Page 1 and 2: OpenAIR@RGUThe Open Access Institut
- Page 4: DECLARATIONI hereby declare that th
- Page 10: M: 1 1 5AI ý 1ýIn these ackowledg
- Page 14: PARTIAL DISCHARGE MEASUREMENTS IN H
- Page 18: 1.1 IntroductionThe induction motor
- Page 22: 1.2 Maintenance PhilosophiesExistin
- Page 28: adial magnetic asymmetries in the m
- Page 32: 1.3.3 Stator Winding FailureFailure
- Page 36: mica flake and backing tape in liqu
- Page 40: Machine insulation breaks down when
- Page 44: sinusoidally at the supply frequenc
- Page 48: endwindings that are as much as 49
- Page 52: 7A9. .,. .............16... v. .. 1
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HV..............:: ý::............
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Figure 1.5.5- Sequence of Discharge
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which are characterised by the disc
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EVIIäOIENTAL STRS4SwCHmCIL 3TRo9CO
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esidual leakage current which arise
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C1SampleCapacitanceA. C.Supplytinul
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Tan 6IiiýVV- Discharge inception v
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C2(specimen)c2TY---lXC4Figure 1.6.1
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ChargeTransferr Lr---,E22VFtime1-'2
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present and this is related to the
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electroncurrentpositiveion current-
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H. V.Supply-77H. V.SupplyH. V.Suppl
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This voltage is distributed across
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NegativeCoronaDischargeInternalDisc
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H. V.Supplyct&I-a) Direct Calibrati
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Examples of three types of common i
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a) Electrostatic Coupling I b) Elec
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pC, are associated with slot discha
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Pu1N Weight Distribution0 Pul.. hei
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So far single discharge sites have
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dependent on the repetition rate of
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Measurements indicate that slot dis
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TunedDetector15 MHz)Figure 1.6.4.1-
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to the winding terminals and the pr
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2.1 Propagation of Partial Discharg
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ýý: ýý 1: ý i: ý; ýýý, ý_
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typical surge impedance values of b
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2.3 Propagation of Steep-Fronted Pu
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-týýýýýýieý"Put2 Vo(ts/div11
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the model , the copper .This depth
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The capacitance of the slot portion
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NormalExtended Earth2,0 V/div0,2 us
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1/0 %V"in.Frequency Response of a S
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Li, IIýVi C Vo0L- Coil Self Induct
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frequency Response of a -Single CUF
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SignalGenerator0Phase WindingTermin
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propagates through the winding stru
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Velocity of ßcpagaticn in a Stator
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egion of the measured value of 38 m
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which behaves like a low pass filte
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ýsýýýsoýýa®aýý®ýý®NFAM
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Since the winding is open-circuited
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8eýýýýýUR-®mý!!1®®'1fma9ý
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you/vinMOMFregcJency Response of Ma
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2.5 Electromagnetic Coupling in the
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thickness, ( 2.5 mm such that the i
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figure 2.4.1, and the pulse wavefor
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of the winding .Each of the pulses
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The gradual rise in the amplitude o
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VouVinFrequency Response of thchine
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ýýýýýý.. ýsaýýýýýýý/1
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PulseGeneratorPulseShapingSA9pfWind
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characteristic .The high frequency
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Similar behaviour is observed when
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instruments such as the ERA dischar
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Wideband detection is much less aff
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3.1 Partial Discharge CouplersA par
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fixed relationship exists between t
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ýFigure 3.3.1- Rogowski CoilImt tl
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This results in an expression for v
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0.5JUsec/cmInputpulse2 V/cmRogowski
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i-ý--Cn--- - --------._L/eNasesign
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vm(t)Figure 3.4.3 -Response of Rogo
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thistype of pulse.Experiments were
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If the condition when T2 i T, is ex
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3.6.2 Charge Measurement with the R
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Je(t)....... ........ 0............
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the self inductance of the toroid i
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Vm = Ip. lZ(4j)l= Ip. R/N(1+ Wo /ý
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- -- -ýIVm (tlr CSt__1ParallelCirc
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The transient solution to the equat
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Vm(tlFigure 3.8.1.1-Parallel Circui
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3.9 Charge Measurement with Narrowb
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CHAPTER FOURDEVELOPMENT AND PERFORM
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Figure 4.1.1- Discharge Pulse Train
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given by ,Y-1- =(L-2dý) .....(4.6)
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SGNIT1 i40-tSGN2,i2140-fFigure 4.1.
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aaaaaaaaaaaaaaMachine Winding3 -Pha
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(rifloco0CBooaa000O®m wM MZI ®®
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The fibre-optic transmitter and the
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delay lines are examined in the fol
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An advantage of this type of transm
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isetime,(hence fall time ), of the
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The implementation of this principl
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comparator .In doing so ,hysteresis
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4.2.3.4 Amplitude and Rise Time Wal
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until all memory positions, (channe
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4 msec---IE--AddressBusMCSStartI Ad
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4.3 Results from Correlation Experi
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Location Scan StatorofWindingcl c2
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positions of the remaining peaks on
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Delay difference T increased by tc1
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Location Scan of Stator Winding180,
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Location Scan of Stator Winding1.c2
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In this second experiment ,the wind
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Pulse Injection Location Peak Locat
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Location Scan of Stator Winding100-
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Location Soon of Stator Minding100-
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Figure 4.4.5.1- Simultaneous Pulse
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Location Scan of Stator Winding109-
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Location Scan of Stator Winding108.
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Similar to the previous results the
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1TrTIIIITH5 V/div! ýmiiý. ýýý
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Location-ScanofStatorWinding1919L..
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Location'ScanofStatorwindingISO-0 2
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Pulse 0[AFGenerator 10ýr;PulseOýG
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Location Scan of Stator Winding109L
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Location Scan of Stator Windinglea_
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Location Scan of Stator WindingISO-
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Location Scan of Stator Minding,iea
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4.4.7 Injection of Three Independen
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LocationScanof Stator WindingIM-(b)
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Although a shift in the discharge l
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4.4.8 Injection of Six Independent
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From these results it can be seen t
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capacitance of the spark gap .Assum
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Couplingcapoci/oriala-Spark gapH. V
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across the spark gap , as shown in
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LocotionSoon ofStatorMinding182L,IA
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LoootionSoonof Stator Winding1®..a
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The observed location for discharge
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interference.In the second test,the
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a cumulative pulse count at channel
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IBO. r'c2, c3, c4Location Scan of S
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5.1 Review of Previous Investigatio
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The solution to these equations was
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in the adjacent slot (through the e
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A comprehensive study was carried o
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Oraee & McLaren [101] followed the
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a complex , electromagnetic , finit
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mode -(transverse electromagnetic m
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EndwindingJunction 2Junction 3SlotJ
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5.3.1. Derivation of Scatter Matrix
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inrvol" [yo 00"ýIv2v3I0 yiyni2 y2
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1000000 -11000000 -11000000-1100000
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C9111 1n11111-1 t.ý-4T f; ' Co, KC
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5.4 Computer AnalysisA suite of FOR
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Therefore, by computing the respons
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STARTSection 1Set . time andinitial
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STARTFigure 5.4.3.5 - Flow Diagram
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system for conductors in the coil m
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variables xi and hn are the impulse
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JUNCTION 4 JUNCTION 3JUNCTION 0JUNC
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The only difference is the inclusio
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CO ..............CCýjýCCsC4C4" cj
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Cl [3.....C2 C3CCý3 ý1CS ....ýyC
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6.1 ConclusionsThe work presented i
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a discharge source to the. -winding
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Tests were performed using a single
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1 Thomson, W. T., Deans , N. D., Le
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26 Gallagher, T. J., -andePearmain,
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54 Karkkainen,S. : 'Internal partia
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77 James, R. E., Trick, - F. E., Ph
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104 Weeks, W. T.: 'Multi-conductor
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C ###########*#*#*#*#***#####**#*##
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CC ########*#######################
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c ****###******#****#**#***##*####*
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CC##**#***#*#***#####**######*#####
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ccccc# SEARCH FOR THE NEXT JUNCTION
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CC ##########*#**###*############*#
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C m. ý.C #*#***#*********##*#*#*##
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NUM-0DO 1000 J=1rNFILEWRITE(5.1001)
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MOOAAR TO PRINT SCATTER MATRICIS.EN
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A TECHNIQUE FOR THE LOCATION OF PAR
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Each coil behaves as a multiconduct
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- --T, wýIw. S. - ýfSll- tlýdl.