PowerPD Case Studies for Motor & Generator
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Transcript of PowerPD Case Studies for Motor & Generator
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CASE STUDY
PARTIAL DISCHARGE TEST
FOR MOTOR & GENERATOR
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Case Study 6Rotating machine (condensing), US
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The data was collected three months before the condensing rotating machine failed
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Fault 1 (on “Back end”)
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Fault 2 (on “back end”)
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Fault 3 (on “front end”)
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45 MVA Generator in Thailand
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Internal Inspection Findings
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??? MVA G t??? MVA Generator in Thailand
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15 MVA Generator in Thailand
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45 MVA Generator in Thailand
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126.6 MVA Generator in ThailandThailand
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148 MW Generator in US
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Case Study 7PD source from inside of insulation
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Internal Inspection Findings
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Case Study 8Signal (PD and 6 pulse) was collected from HFCT installed on the tank ground of
Transformer. This signal(PD and 6 pulse) transmitted from the generator side.
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6 pulse coming from Generator side
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Inspection Findings
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Case Study 9Warning level of PD was collected from HFCT installed on the tankWarning level of PD was collected from HFCT installed on the tank ground of Transformer. This PD transmitted from the generator and shot down the generator for maintenanceshot down the generator for maintenance
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PD burst collected from HFCT
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Inspection Findings
After serviceAfter service
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Case Study 10230 KV 300 MVA @ Thailand@
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PD burst collected from sensor3(yellow)
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Internal Inspection Finding
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Case Study 11500 KV 500MVA @ Philippines500 KV 500MVA @ Philippines
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PD collected from AE and HFCT
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Internal Inspection Finding: Burnt cable from 500kv winding to K pic2 3Burnt cable from 500kv winding to K_pic2.3
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Case Study 12 Transformer Test Results:
• TTR Test OK• Doble Test OKDoble Test OK• Doble SFR Test inconclusive• ABB DFR Test:
– Indicates a problem between H&X Winding - Tertiary• Final DGA Test –
Acetylene 3 ppmMethane 1259 ppmEthane 163 ppmEthylene 7 ppmHydrogen 27123 ppm
• ABB Internal Inspection – B phase core shifted due to through f lt / i di t l ifaults/winding telescoping
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Transformer test with TP500A @ US
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Internal Inspection Findings
E id f h ti b BØ C C li D tEvidence of heating above BØ Core Cooling Ducts
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Internal Inspection Findings
Shifted Core over BØ:
Shifted approx ¾” vertically & ½” Horizontally
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Case Study 13PD source between winding (Data collected with TP500A)
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Internal Inspection Findings
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Case Study 14 Transformer Test Results:
• Final DGA TestFinal DGA Test Methane 532 ppmEthane 363 ppmEthane 363 ppmEthylene 13 ppmHydrogen 1,140 ppm (From last year 08 Hydrogen was at 964)y g , pp ( y y g )
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PD source from inside of insulation (Data collected with TP500A)
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Internal Inspection Findings
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Case Study 15 220 KV GIS Test Results: Data collected with iGMS P8220 KV GIS Test Results: Data collected with iGMS_P8
Data from UHF1
Data from UHF2
Data from HFCT
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Case Study 16 220 KV GIS Test Results: Data collected with iGMS_P8_
Data from UHF 1 Data from UHF 2 Data from UHF 3 Data from UHF 4