Page 79 - Basic PD Theory

References

Endwinding, 49 frequency, 17, 24
Excitation, 53 Pulse travel, 17, 18
Other non-classic pulses, 53 Capacitive coupling, 17, 18
On-line testing Radiation, 16, 17, 18
Safety precautions, 33 Transmission, 17, 18
Test setup, 33 Pulses
Organic resins Glow pulses, 17
Asphalt, 5, 7, 12 Glow pulses, 14, 16
Epoxy, 5, 7, 8, 12 Pseudo-glow pulses, 17
Polyester, 5, 7, 12 Pseudo-glow pulses, 16
Thermoplastic, 46 Radiation, 16, 17, 18
Thermoplastic resins, 7 Reduced load, 46
Thermoset, 7, 46 Semicon/grading interface, 47
Overvoltage, 16, 19 Semi-conductive coating, 9, 10
Ozone, 9, 10, 11 Sensors
PD summary variables Capacitive couplers, 21, 22
NQN, 28 Stator Slot Couplers (SSC), 21, 22
Qm, 36 Skin effect, 5
Qm, 29 Stator Slot Coupler (SSC), 33, 60
PD-Lite Software Stator Slot Couplers (SSC), 21, 22
Errors, 35 Strand insulation, 5, 6
Flames, 35 Stray current losses, 5
Running a test, 35 Surges, 12
Peak magnitude (Qm), 36 Temperature effect, 43
Phase Resolved Plots, 29 Direct, 39, 47
Linear Pulse Density, 29 Inverse, 39, 43, 44
Phase to Phase discharges, 11 Test method, 21
Phase to Phase PD, 60 TGA - Bus, 60
Polarity predominance, 42, 44 TGA - SSC, 60
Negative, 43, 44 Thermal cycling, 12, 14
None, 43, 44, 49 Thermal deterioration, 2
Positive, 46, 47 Thermoplastic resins, 7, 46
Positive Polarity predominance, 47 Thermoset resins, 7, 46
Pulse distributions, 41 Time-of-Arrival, 25
Across ac cycle, 41 Differential, 25, 26
Narrow band, 41 Directional, 25, 26
Normal, 41 Transmission, 18
Unusual, 41 Trend analysis, 36, 37
Wide band, 41 Turn insulation, 5, 6, 7
Pulse Height Analysis Plot (2-D), 29, 36 Vacuum pressure impregnation (VPI), 7
Pulse Phase Analysis Plot (3-D), 42 Voltage stress control
Pulse Polarity Grading coating, 9, 10, 47
Bulk of insulation, 19 Semi-conductive coating, 9, 10
Near copper conductors, 12, 19 Widespread deterioration, 41
Near the Core Iron, 45 Zone of coverage, 51, 60, 61
Pulse shape

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