FFLC Design
DC FILTERING 1.61.41.21.0
0.8100100010000Lifetime Expectancy (hours)1000001000000 50 C70 dc n /V w V C85 C V
w : permanent working or operating DC-voltage.
ELECTRICAL CHARACTERISTICS
Climatic category40/85/56 (IEC 60068) FFLC overvoltage: (V
s ): V
s = 2 V
n dc and limited at 2100VMaximum Peak valueMaximum duration overvoltage1.67V
n dc100 ms1 time per week1.25V
n dc100 ms1 time per day 1.1V
n dc1 min1 time per dayTest voltage between terminals @ 25C 1.5 x V
n dc for 10sTest voltage between terminals and case@ 25C @ 4 kVrms @ 50 Hz for 1 min.
STANDARDS HOT SPOT CALCULATION
LIFETIME EXPECTANCY vsHOT SPOT TEMPERATURE AND VOLTAGE
IEC 61071-1: Power electronic capacitorsIEC61071-2: Power electronic
capacitors
IEC 60068-1: Environmental testingIEC 60077: Rules for electric traction equipmentUL 94: Fire requirementsNF F 16-101
NF F 16-102: Fire and smoke requirementsIEC 61881: Railway applications, rolling stockequipment, capacitors for powerelectronics θ
hot spot = θ
ambient + (P
d + P
t ) x R
th withP
d (Dielectric losses) = Q x tg δ
⇒ [
1 ⁄
2 x C
n x (V
peak to
peak )
2 x f ] x (2 x 10
-4 )P
t (Thermal losses) = R
s x (I
rms )
2 whereC
n in FaradI
rms in Amperefin HertzVin VoltR
s in Ohm θ in CR
th in C/W
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