Medium Power Film capacitors

FFB

DC FILTERING These capacitors have been designed principally for high and medium power DCfiltering applications.

ELECTRICAL CHARACTERISTICSDC FILTERING FOR INDUSTRIAL APPLICATION

Capacitance rangeC
n 1.5µF to 13µF Tolerance on C
n ±10% Rated DC voltageV
n dc525 to 1100 V Dielectricpolypropylene

TANGENT OF LOSS ANGLE (TAN δ

)FOR POLYPROPYLENE DIELECTRIC θ Polypropylene has a constant dielectric loss factor of 2x10
-4 irrespective of temperature and frequency (up to 1 MHz).
hot spot = θ
ambient +

[

tg δ
.Q + R
s .(I
rms )
2

]

.R
th

HOT SPOT TEMPERATURE CALCULATION

With:Q : Reactive power in Var R You can calculate the maximum operating (hot spot) temper-ature of this capacitor in the following manner:The loss factor of the capacitor is made up of the sum of two components. The first represents electrical losses (tg
S in OhmI in AmpereR δ
rms th : Rth ambient / hot spot in °C/Wtg δ
-4 .(10 ) is the tangent of loss angle for polypropy-lene dielectric. Polypropylene has a constant dielectric losses factor of 2x10
= 2x10
-4) and the second component represents Jouleeffect in the connection and foils, (Rs.C.2 Ï€ f). For all applications, the temperature in the hot spot capaci-tor must be lower than 105°C. Heating calculation of hot spot capacitor:
-4 irrespective of temperature andfrequency (up to 1 MHz).

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