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

(

)

)

(

in failures/hour

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

λt)

N is the number of pieces still working after t hours.

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.