1.2 1231 control of inductive load switching transients

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  • 1. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 1-Nationale voorbespreking CIRED 13Session 1, Paper 1231:CONTROL OF INDUCTIVE LOADSWITCHING TRANSIENTSGerard Schoonenberg / René SmeetsEaton / DNVKema
  • 2. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 2-1231: CONTROL OF INDUCTIVE LOAD SWITCHING TRANSIENTS3 onderwerpen:• Overzicht Switching transients (reprise Cired 1989, p.2.17)• + wanneer protection measures nodig• Nieuwe ed. IEC 62271-110: Inductive load switching• Droge trafo’s toename storingen (?) (Overspanningen, Vacuum)
  • 3. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 3-1231: CONTROL OF INDUCTIVE LOAD SWITCHING TRANSIENTSOverzicht Switching transients• Voorontsteking altijd!• Current chopping• Herhaalde herontstekingen vacuum en olie• Virtuele stroombreking• resonanties
  • 4. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 4-1231: CONTROL OF INDUCTIVE LOAD SWITCHING TRANSIENTSIEC 62271-110 (ed.3.0.m sept 2012): Inductive load switching• Motor circuit t/m 17.5 kV; 4 test duties• Veel / weinig C aan voedende zijde= ca Totaal >5 km kabel / totaal < 100m• Stroom 100 resp 300 A• TD2 (weinig C, hoge I) virtual current chop
  • 5. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 5-1231: CONTROL OF INDUCTIVE LOAD SWITCHING TRANSIENTSDroge trafo’s toename storingen (?) (Overspanningen, Vacuum)• 0-5 jaar oud, complied with present standards• Resonance freq 5-200 kHz / overheating (max inrush each closing)• Design changes? (foil / wire)• Materials / additives?• Applications? (rectifiers, inverters, PWM motor drive:pulse trains 20kHz - >40 kHz)• Diel. Test op trafo:• 2*Pwf: 2* Ur• Impulse 1.2/50 μs• In practice: t_rise <0.1μs possible(closing CB →T2T 2.5*worse than at impulse,IGBT switching)• Oil type higher surge withstand test than Dry type
  • 6. Nl voorbespreking CIRED 2013 8 mei 2013 session 1: NETWORK COMPONENTS - 6-1231: CONTROL OF INDUCTIVE LOAD SWITCHING TRANSIENTSCired 1999 p1.12, ch.5.2 (KU Leuven + Pauwels):In most cases of transformer failure due to transient overvoltages, the transformermanufacturers will find themselves in a difficult position. Even if they areconvinced that their product is in full compliance with all applicable standards,their explanation is often disbelieved.Whatever effort they make to help the customer, e.g. a replacement by reinforcedwindings, it will always be regarded as a confession of guilt, and finally thecustomer will always end up asking the replacement of all identical units.CONCLUSIES:• Steile spanningssprongen geen specifiek vacuum probleem• (Droge-) TRAFO STANDARDS aanpassen aan boze buitenwereld?