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DFFHV14FX2637 Datasheet(PDF) 5 Page - AVX Corporation |
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DFFHV14FX2637 Datasheet(HTML) 5 Page - AVX Corporation |
5 / 13 page 59 092315 Medium Power Film Capacitors FFHV/FTHV 1500Vdc to 3000Vdc MEAN TIME BETWEEN FAILURE (MTBF) MTBF = 1 /λ hours MTBF CALCULATION GENERAL FAILURE RATE Based on Return Of Experience from the field of more than 30 years, we have established the following relation. The failure rate λB depends on hot spot temperature θHS and charge ratio ρ. ρ = Uw/Un ( ) ) ( in failures/hour λ=λB x πQ x πB x πE failures/hour • πQ, πB and πE see following tables Qualification Qualification factor πQ Product qualified on IEC61071 1 and internal qualification Product qualified on IEC61071 2 Product answering on 5 another norm Product without qualification 15 Environment Environment factor πE On ground (good conditions) 1 On ground (fixed materials) 2 On ground (on board) 4 On ship 9 On plane 15 Environment Environment factor πB Favorable 1 Unfavourable 5 SURVIVAL FUNCTION N = N0 x exp (- λt) N is the number of pieces still working after t hours. N0 is the number of pieces at the origin (t = 0) FAILURE MODE Main failure mode due to AVX’s Controlled Self-Healing Technology is only losses of capacitance. Thanks to Controlled Self-Healing solution to interrupt self-healing process in order to prevent avalanche effect due to polypropylene molecular cracking producing gas and potential explosion in confined box for none Controlled Self-Healing capacitors. |
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