Internal Fault Detection in Distribution Transformers

Internal Fault Detection in Distribution TransformersFMEA Energy Connections ConferenceNovember 6, 2015 Paul Henault IFD CorporationWhy is Internal Fault Detection important?Why Internal Fault Detection is importantLinemen Safety Operating challenges Crew pressures Risk every time we re-closeTroubleshooting Effectiveness Speed AccuracySystem Reliability Reduce outage times SAIDI/SAIFIWhy Internal Fault Detection is importantWhat does an Internal transformer Fault look like? A rapid, transient pressure rise occurs in every Internal arcing Fault Variable peakpressure Consistent rate of riseWhat does an Internal transformer Fault look like?Certification tests at Powertech Labs500A testArc VoltageFault CurrentPressure RiseNormal FaultIFD activates before peak~ 3 psiWhat about PRV s? PRV operation:P > 10 2 psi Internal Fault (Poppet style PRV) does not have time to react to the overpressure rates of rise and values produced when low-impedance faults occur.

Value Summary Pole mounted Pad mounted Typical cost per transformer $1,000 $10,000 Efficiency (Trouble call time savings) 1‐phase 3‐phase bank $120 – 350 $480 – 960 $400 – 800

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  Phases, Internal, Distribution, Mounted, Fault, Detection, Transformers, Internal fault detection in distribution transformers, Mounted pad mounted

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