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Experience with On line PD Measurements on MV Motor Windings in South Africa By James Cowling Martec Martec Approach • Represent – EDI – Eaton • On Line PD Monitoring Systems – Monitors and Predictive relays – Sensors • 80pF Capacitive Couplers (vendor neutral) • Stator Winding RTD’s • RFCT’s Basic Sensors RTD Module RFCT Coupling Capacitor Partial Discharge Monitor Up to 90 PD channels Cables Switchgear Motors Generators Bus Duct PD Quantities • PD Magnitude (mV or pC) – Size or the volume of the defect • Pulse Count (PPS) – Number or Growth of defects • PD Intensity/Power (mW) – Destructive Power of the PD events • PD Signature – Phase of the Defect – Type of Defect Phase Resolved Data • Phase to Ground • Phase to Phase • PD Signature Fingerprint Analysis Partial Discharge between insulation and HV (delamination from copper) Pulse magnitudes on positive half wave is higher than on negative. (Negative Preference) Fingerprint Analysis Balance of Polarity Pulses: Internal Insulation Delamination Fingerprint Analysis Partial Discharge between insulation and ground (Probably Slot Discharge) Pulse magnitudes on negative half wave is higher than on positive. (Positive Preference) Negative Temp Coefficient Positive Temp Coefficient Trending 9,5MW 11kV Synchronous 9,5MW 11kV Synchronous APRG Why Couplers and RTD’s • 17MW 11kV Motor VSD 11MW 11kV Compressor AFPW 1 11MW 11kV Compressor AFPW 1 17,15MW 11kV Compressor Motor 11kV 17MW DOL Compressor 6,6kV Motors • Martec requested to demonstrate equipment • 3 Identical 9MW Motors • Single PD Measurements with 80pF Couplers only. Motor 3 PDI and Qmax Readings Motor 3 NQ Graphs Motor 3 3D Graphs Motor 2 Motor 1 PDI trend Motor 1 PR Graphs Motor 1 PR Graphs Motor 1 PR Graphs 20MW Generator With Noise 20MW Generator with Noise Noise Reduced by RFCT 27MW 11kV Motor 12MW 11kV Motor 12MW 11kV Motor Design Deficiency? Tan Delta Results 49MVA Generator Power Factor Tip Up for TG1 0.7 0.66 0.6 Phase A 0.57 % Power Factor 0.5 0.50 0.44 0.4 0.39 Phase B 0.35 0.3 0.2 Phase C 0.1 0 2 4 5 6 KV Applied 7 8 Case Study - 49 MVA Generators Before Repair After Repair Case Study - 49 MVA Generators A & C Phase Connection Ring Need more space 110MVA 10,5KV Generator LOSS TANGENT / CAPACITANCE vs VOLTAGE 600 Tan Delta (1e-4) 50 0 • 400 Turbine End 300 200 10 0 0 2 10 0 4200 6300 8400 10 50 0 Voltage (Volts) LOSS TANGENT / CAPACITANCE vs VOLTAGE 600 Tan Delta (1e-4) 50 0 • 400 300 200 10 0 0 2 10 0 4200 6300 Voltage (Volts) 8400 10 50 0 Exciter End PD Data Turbine End PD Data Exciter End 11kV Generators • No Sensors RTD sensor installed temporarily Couplers and RTD sensor installed Humidity and Temperature 11MW Compressor Motor Effects of Humidity The End • Questions