37
DC FILTERING
High Power Film Capacitors
FILFIM Caution Features
HANDLING
When unpacking, it is important that no mechanical shocks
occur that might deform the cans and damage the output
connection.
The capacitors include, unless otherwise specified, one or
several gripping elements (mass screws, jack rings or other
hoisting devices); they should be exclusively handled by
means of these elements.
In no case should the electrical output terminals be
used to lift the capacitor.
The grounding wire should be kept in place until the
capacitor is mounted.
ASSEMBLY AND INSTALLATION
To check for the absence of excessive mechanical
stresses.
The mechanical stresses in assembly should remain com-
patible with the characteristics of the capacitor.
The method of mounting should not lead to the deformation
of the capacitor case.
Tightening torques are given below:
Output through threaded connections:
max = 25 N-m
Output on flats:
Tightening of the nut is realized by blocking the screw
head to avoid wrench on the terminal head.
Mechanical mounting
Considering the manufacturing tolerances for the cans
and the frames on which they are mounted, avoid:
4 anchoring points (or more) in the same plane.
2 or several separate parallel anchoring planes.
Whenever possible, priority should be given to anchoring by
flanging or binding with a damping element placed in
between.
Connections
They should not induce any force on the output terminals.
Flexible connections should be used (braided or thin metal).
The cross section should not be less than:
S = 0.2 x Imax where S (mm2) and Imax (A)
The skin effect which occurs at high frequencies, must also
be taken into account.
SAFETY
As stated, the TRAFIM technology is based on the controlled
self-healing property of the segmented film. This unique tech-
nology provides excellent safety: there is no risk of explosion
in case of defect throughout the life of the capacitor. This
explains why there is no need to equip these capacitors with
pressure switch.
Rapeseed oil is not explosive or flammable at normal condi-
tions, therefore capacitors can be transported without being
subjected to safety rules.
Rapeseed oil flash point is about 317°C and the polypropy-
lene flash point is near 300°C, so the melting certifies a tem-
perature of security above 300°C.
In case of fire above this temperature, it is recommended to
use dust or CO2. The use of water is contra-indicated. The
possible rejected products during fire are CO2, H2O, CO (in
case of non-complete combustion), hydrocarbons and some
others gazes. Carrying mask is required for protection.
CALORIFIC VALUE
We have established a simplified formula that gives the
calorific value of a standard FILFIM capacitor:
CV (MJ) = 0.0137W(mm) x H(mm) -0.0044 H(mm) +
0.2718 W(mm) + 15.46 + 6.2 x N x T
Where H is height and W is width, N is the number of terminal
(2 if normal, 1 in case of option) and T is code of terminal type.
EXAMPLE
DC FILTERING
For a standard capacitor (N = 2) of 107 µF / 10,600 V:
W = 185mm
H = 470mm
L = 350mm
then CV = 1280 MJ
as weight = 40 kg
then the calorific value per weight is
cv = 32 MJ/kg