John G. Buchan PhD.pdf - OpenAIR @ RGU - Robert Gordon ...

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Location Scan of Stator Winding108. rKýpc0"a8 25 50 75 100 125 150 175 200 225 250Delay S. UingPlot I. +d. x s OPIS Muxs. u. Count " 2070Figure 4.4.5.4 -Scan of Pulses Injected at, Positions c5 and c7Page 217
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OpenAIR@RGUThe Open Access Institut
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DECLARATIONI hereby declare that th
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CHAPTER FOUR DEVELOPMENT AND PERFOR
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My help comes from the Lord, whomad
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CHAPTER ONEINTRODUCTION
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motors ratings were not reported ).
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surfaces from spark erosion which i
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Another source of rotor bar overhea
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TurnInsulationConductorFigure 1.4.1
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Figure 1.5.1- Failure Modes in High
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insulation swells .Thermal cycling
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Abrasionpoints .Figure 1.5.2 -Endwi
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pole closure will result in a steep
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Internal discharges take place in s
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The voltage Vc, developed across th
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, uJoules), have shown that the cry
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discharges of this type damage both
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1.6 High Voltage Insulation Diagnos
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V0IRsdParallelcircuitSeries circuit
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At bridge balance position the rati
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circuit effect partial discharges h
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idge is balanced by adjusting the v
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observed as a ripple effect distort
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generalisations are discussed in th
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When a discharge takes place in the
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obtain the balance condition. Any d
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I-rFigure 1.6.2.3-Passive Resonant
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that of a calibration pulse .The ca
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Figure 1.6.2.7-Point to Hemi-sphere
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Thyris for ControllerFluorescent Li
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ejects unwanted signals which are r
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The first to recognise the importan
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Pulse HeightDistribution100-I22k:Po
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High intensity slot discharge, as o
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RYBFrequencyMeter /SpectrumAnalyser
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signal level have been detected by
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primary, (the coil conductor), and
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CHAPTER TWODISCHARGE PULSE PROPAGAT
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velocities and attenuation .Tests w
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The coils are typical of those used
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Ri-ZO N Zc-i-Figure 2.2.2 - Star co
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aglePulseGeneratorTo C. R. T. --Dis
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It is apparent from the waveform th
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a- conductor heightb- interturn ins
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v=c. ( 1+ de/ds)(, /-E-r + de/ds)Th
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time through the coil with the exte
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are manifested in the observed coil
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which , for the values of L and C,
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In the study of steep fronted wave
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RonEMEME ý`®um®olp-PRI_wanommen-
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Velocity of propagation based on ti
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ecording the transit time of a sinu
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li ad/volfnauenryResponse of P6chne
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L is the self inductance of the win
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VouVinFrequency Response of &chine
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wavelength is equal to the length o
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Source ResistanceWindingInductanceL
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frequency of 113.5 kHz , which corr
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2 VJdivo, s u/divD, 5, usec/divFigu
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2 V/div0,5 Vld1V0,5, usec/di vFigur
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ýýýannýýýýý! M®®zz®awa 9
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%I"ou,., Vinfrequency Response of !
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and the given boundary conditions a
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No. of Wavelengths Frequency Freque
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duration of approximately 1 usec an
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MO MESolU®®EM®Ný®®ýý®®rod
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a ® u ®ýsI®®®! ýsIR, rmm ®a
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lMENNENE®®ES®wmwwwwý®wwwwýiil
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AmplitudeResponse". 09,50,0ý. --'-
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CHAPTER THREETHE ROGOWSKI COIL IN P
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i. Sensitivity depends on the perme
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which,e=M.Lp....(3.2)dtThis equatio
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which on integrating w. r. t. time
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device has a poorer response at low
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tilt = R. tp x 100Lwhere tp is the
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The rise time of such a coil is les
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ii. Passive integration ;This metho
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ZSzoipm--QPulse GeneratorýFigure 3
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Ratio 0TZT,15\\ITimeFigure 3.6.1.3
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The output voltage of the integrato
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The general expression for the-self
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coil resistance at frequencies at w
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3.8 Narrowband Current MeasurementI
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parallel circuit is therefore most
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and is given by equation,vm(t) = Ip
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DischargePulse50mV/cm CoilOutputFas
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i. The partial discharge current pu
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4.1 Principle of Location Technique
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ff(t').R12() = lm 1 f (t'+ + (f, -1
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position in time when the pulse wav
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Although information regarding the
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A microcomputer is used to supervis
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CurrentsignalRogowskicoilIntegrator
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Figure 4.2.1.2-Discharge Detection
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Z' = 100fito 4000j,, and delays of
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DelaylineRelayDriverMercury-WettedR
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Delay LineOutput2 V/div0,2 uses/div
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ComplementaryoutputsDelaylineUnity
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ThresholdlevelýhPulseJitter.1Figur
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VYThreshädý-ýý_timeTwa(kTwalkAm
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having used the scanning technique
Page 406: Figure 4.2.5.1-MICA : Machine Insul
Page 410: Figure 4.3.1-Discharge Injection Te
Page 414: The position of the discharge sourc
Page 418: 4.4.2 Effect of Discrimination Leve
Page 422: obtain pulse coincidence.The scan s
Page 426: The experiment in section 4.4.1 is
Page 430: Pulse Injection Channel Position De
Page 434: Location Scan of Stator Winding186-
Page 438: It is assumed that for these dimens
Page 442: Pulse Injection Channel Position De
Page 446: internal partial discharges and sur
Page 450: winding . The corresponding locatio
Page 454: The spurious location on channel 25
Page 460: Similar to the previous results the
Page 464: 1TrTIIIITH5 V/div! ýmiiý. ýýý
Page 468: Location-ScanofStatorWinding1919L..
Page 472: Location'ScanofStatorwindingISO-0 2
Page 476: Pulse 0[AFGenerator 10ýr;PulseOýG
Page 480: Location Scan of Stator Winding109L
Page 484: Location Scan of Stator Windinglea_
Page 488: Location Scan of Stator WindingISO-
Page 492: Location Scan of Stator Minding,iea
Page 496: 4.4.7 Injection of Three Independen
Page 500: LocationScanof Stator WindingIM-(b)
Page 504: 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.
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