Page 78 - Basic PD Theory

References

J. Index

Attenuation, 17, 25 Thermal cycling, 12
Bar (half coil), 3, 4, 6, 8, 12 Thermal deterioration, 2
Bar/Coil Movement, 9, 10, 47 Flames, 35
Breakdown voltage, 15, 16 Full load, 46
Capacitive couplers, 21, 22 Girth cracking, 12
Classic PD Global VPI, 7, 8
Polarity predominance, 42 Grading coating, 9, 10, 14, 19, 45, 47
Coil/bar movement, 14 Groundwall insulation, 4, 6, 10, 13
Comparison to similar machines, 39 Humidity effect
Contact sparking, 10 Direct, 39
Contamination, 13, 34, 38, 41, 50 Inverse, 39
Corona, 14, 24 Hydrogen effect, 39
Cross-coupling, 53 Direct, 39
Differential Installation, 25, 26 Inverse, 39
Direct temperature effect, 47 Impedance Mismatch, 25
Directional Installation, 25, 26 Impregnation, 7, 8
Disturbance Separation Impregnation process
Differential Time-of-Arrival, 26 Global VPI, 7, 8
Directional Time-of-Arrival, 26, 27 Vacuum pressure impregnation (VPI), 7
Impedance Mismatch, 25 Inadequate Spacing, 11
Time-of-Arrival, 25 Insulation types
Electrical breakdown, 6, 9, 10 Groundwall, 4, 6, 10, 13
Electrical connections, 11 Strand, 5, 6
Electrical slot discharge, 9 Turn, 5, 6, 7
Electrical Tracking, 13, 50 Internal delamination, 43
Endwinding PD, 20, 49 Internal Delamination, 12, 43, 44
Errors, 35 Interphasal PD, 53
Excitation, 53 Inverse temperature effect, 43, 44
External Power Frequency, 35 Isolated problems, 41
Failure mechanism, 13 Linear Pulse Density, 49
Bar/Coil Movement, 9, 10, 47 Load effect, 48
Contamination, 13, 34, 38, 41, 50 Direct, 39
Electrical connections, 11 Inverse, 39
Electrical slot discharge, 9 None, 44, 47, 49
Electrical Tracking, 13, 50 Loose windings, 42
Endwinding PD, 20, 49 Manufacturing defect, 8, 14
Internal delamination, 43 Mica, 5, 6, 7, 8, 12, 67
Internal Delamination, 12, 43, 44 Negative Polarity predominance, 43
Interphasal PD, 53 Negative predominance, 44
Loose windings, 42 No Load effect, 44, 47, 49
Manufacturing defect, 8 No Polarity predominance, 44
Phase to Phase discharges, 11 Noise Cancellation
Phase to Phase PD, 60 Band-pass filtering, 24
Semicon/grading interface, 47 Non-classic PD
Surges, 12 Cross-coupling, 53

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