Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
The FFHV and FTHV series are specifically designed for DC filtering applications
such as DC link or resonant filters for voltages up to 3000V.
These capacitors are proposed in 2 different versions: resin top for the FFHV series
and hermetic case for the FTHV.
Large case sizes up to 36 liters and high specific energy up to 380J/l together with
safe and reliable Controlled Self Healing Technology make this series particularly
suitable for power converters in traction, drives, renewable energy and power
transmission areas.
FFHV and FTHV use a wet solution with polypropylene metallized film and oil
(without free oil). Standard designs proposed in this catalogue are covering a wide
range of voltage and capacitance values.
In case of specific requirements about shape and performances, feel free to
contact your local AVX representative.
PACKAGING MATERIAL
FFHV
Non-painted rectangular resin filled aluminium case
Mounting brackets
M8/17 female connections or M12/30 male connections
2 or 4 connections
FTHV
Non-painted rectangular aluminium hermetic case
Mounting brackets
M8/17 female terminals or M12/30 male terminals
2 or 4 terminals
STANDARDS
FFHV
IEC 61071: Power electronic capacitors
IEC 61881: Railway applications, rolling stock equipment,
capacitors for power electronics
IEC 60068-2: Environmental testing
UL 94: Fire requirements
NF F 16-101: Rolling stock – Fire behaviour – Materials
choosing
NF F 16-102: Rolling stock – Fire behaviour – Materials
choosing, application for electric equipments
EN 45545-2: Railways applications – Fire protection on
railway vehicles. Part 2: Requirements for
fire behaviour of materials and components
FTHV
IEC 61071: Power electronic capacitors
IEC 61881: Railway applications, rolling stock equipment,
capacitors for power electronics
IEC 60068-2: Environmental testing
EN 45545-2: Railways applications – Fire protection on
railway vehicles. Part 2 : Requirements for
fire behaviour of materials and components
HOW TO ORDER
D
FFHV
Series
FFHV: resin top
1
2
3
4
1
Section and Option
= 340x125 2 connexions
= 340x125 4 connexions
= 340x175 2 connexions
= 340x175 4 connexions
1
2
3
4
5
6
1
Height
= 230mm
= 295mm
= 370mm
= 450mm
= 530mm
= 610mm
M
Terminal
Code
F = female
M = male
R
Voltage
R = 1500V
S = 1750V
N = 2000V
T = 2250V
P = 2500V
W = 2750V
X = 3000V
2637
Capacitance
EIA code
D
FTHV
Series
FTHV: hermetic case
1
2
3
4
1
Section and Option
= 340x125 2 connexions
= 340x125 4 connexions
= 340x175 2 connexions
= 340x175 4 connexions
1
2
3
4
5
6
1
Height
= 240mm
= 305mm
= 380mm
= 460mm
= 540mm
= 620mm
M
Terminal
Code
F = female
M = male
R
Voltage
R = 1500V
S = 1750V
N = 2000V
T = 2250V
P = 2500V
W = 2750V
X = 3000V
2637
Capacitance
EIA code
092315
55
DC FILTERING
Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
DEFINITIONS
C
n
(μF)
U
n
(V)
U
w
(V)
U
r
(V)
L
s
(nH)
R
s
(mΩ)
capacitance
rated DC voltage
working voltage
ripple voltage
parasitic inductance
series resistance
nominal value of the capacitance measured at
θ
amb
= 25 ± 10°C
maximum operating peak voltage of either polarity (non-reversing
type waveform), for which the capacitor has been designed for
continuous operation
value of the maximum operating recurrent voltage for a given hot
spot temperature and an expected lifetime
peak-to-peak alternating component of the unidirectional voltage
capacitor series self-inductance
capacitor series resistance due to galvanic circuit
rms current value @ 100Hz for continuous operation under natural
convection generating 20°C overheating (255A
rms
maximum for 2
connexions or terminals and 400Arms maximum for 4 connexions
or terminals)
rms current value @ 100Hz for continuous operation under forced
air generating 20°C overheating (255A
rms
maximum for 2
connexions or terminals and 400Arms maximum for 4 connexions
or terminals)
temperature of the cooling air measured at the hottest position of
the capacitor, under steady-state conditions, midway between
two units
NOTE If only one unit is involved, it is the temperature measured
at a point approximately 0.1 m away from the capacitor container and at two-thirds of
the height from its base
CHARACTERISTICS
Capacitance range C
n
Tolerance on C
n
Rated DC voltage U
n
Lifetime at U
n
and 70°C
hot-spot temperature
and
ΔC
/ C < 2%
Parasitic inductance L
s
Maximum rms current I
rms
Test voltage between terminals
@ 25°C
Test voltage between terminals
and Case @ 25°C
Dielectric
Climatic Category
Working temperature
Storage temperature
Calorific value
590μF to 12600μF
±10%
1500 to 3000V
100,000h
27nH to 88nH
up to 400A
rms
1.5 x U
n
for 10s
7kV
rms
@ 50Hz
for 10s
polypropylene
40 / 85 / 56
(IEC 60068)
-40°C / +85°C
(according to the
power dissipated)
Uw/Un
DC FILTERING
I
rms
(A)
RMS current
Thermal 1
I
rms
(A)
RMS current
Thermal 2
θ
amb
(°C)
cooling air temperature
-40°C / +85°C
34 MJ/kg
θ
HS
(°C)
hot spot temperature
highest temperature obtained inside the case of the capacitor in
thermal equilibrium
LIFETIME EXPECTANCY VS HOT SPOT TEMPERATURE AND VOLTAGE
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
100
θ
HS
= 60ºC
θ
HS
= 70ºC
θ
HS
= 80ºC
θ
HS
= 85ºC
1,000
10,000
100,000
1,000,000
Lifetime Expectancy (hours)
56
092315
Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
The capacitor lifetime depends on the working voltage and the hot spot temperature.
Our caps are designed to meet 100000 hours lifetime at rated voltage and 70°C hot spot temperature. In accordance with
operating conditions, please calculate the hot spot temperature and deduce from this calculation if the obtained lifetime can suit
the application.
1. From the tables, select a capacitor with required capacitance
C
n
and voltage U
n
.
Calculate the maximum ripple voltage allowed for the selected cap:
U
rmax
= 0.2U
n
If U
r
>U
rmax
, select a capacitor with higher rated voltage
Make sure I
rms
application < I
rms
table
Copy out:
• serial resistance (R
s
): see table of values
• thermal resistances R
th1
and R
th2
(depending on cooling conditions)
2. Hot spot temperature calculation
Total losses are calculated as follow: P
t
=P
j
+P
d
Joule losses: P
j
= R
s
x I
rms²
Dielectric losses: P
d
= Q x tgδ0 with
• Q(reactive power) = I
rms2
for a sinusoidal waveform
–––––
C
• tgδ0 = 2 x 10
-4
(dielectric losses of polypropylene)
Hot spot temperature will be:
HS
=
amb
+ (P
j
+ P
d
) x (R
th1
+ R
th2
)
HS
absolute maximum is 85°C
If temperature is higher than 85°C, come back to #1 and start again
with another selection.
R
th1
: thermal resistance between hot spot and case
R
th2
: thermal resistance between case and ambient air
3. Refer to the curve and deduce the lifetime vs U
w
/U
n
ratio
1.5
1.4
1.3
1.2
θ
HS
= 65ºC
U
n
U
w
U
r
Voltage
1/f
Time
R
th1
R
th2
HS
CASE
AMB
width
1.1
1
0.95
0.9
0.8
0.7
100
eg: rated voltage 2000V
working voltage 1900V
ρ
= 0.95
⇒
lifetime 200,000 hours
@ 70°C hot spot temperature
Please, find a calculation form at the end of the catalog
Uw/Un
1,000
10,000
100,000
200,000
1,000,000
Lifetime Expectancy (hours)
092315
57
DC FILTERING
HOW TO CHOSE THE RIGHT CAPACITOR
Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
THERMAL RESISTANCES
R
th1
(°C/W): Thermal resistance
between hot spot and case
Height
(mm)
230/240
295/305
370/380
450/460
530/540
610/620
Rth1 (°C/W)
Width (mm)
125
175
0.40
0.41
0.33
0.36
0.27
0.30
0.22
0.26
0.19
0.22
0.17
0.19
DC FILTERING
R
th2
(°C/W): Thermal resistance between case and ambient air
under natural convection and forced air
Height
(mm)
230/240
295/305
370/380
450/460
530/540
610/620
Rth2 (°C)
Natural air cooling
Width (mm)
125
175
0.3
0.26
0.25
0.21
0.2
0.18
0.17
0.15
0.15
0.13
0.13
0.11
Forced air cooling >2m/s
Width (mm)
125
175
0.15
0.13
0.13
0.11
0.1
0.09
0.09
0.08
0.08
0.07
0.07
0.06
For confined area, capacitor working in a closed cabinet, a thermal test
under real conditions is necessary to evaluate the thermal resistance.
PARASITIC INDUCTANCE VS SIZE
Measurement @ 1MHz
Height
(mm)
230
295
370
450
530
610
L
s
(nH) FFHV resin top
Width (mm)
2 Connections
4 Connections
125
175
125
175
70
73
27
30
72
77
29
34
75
82
32
39
79
86
36
43
82
91
39
48
85
96
42
53
Height
(mm)
240
305
380
460
540
620
L
s
(nH) FTHV hermetic case
Width (mm)
2 Connections
4 Connections
125
175
125
175
73
76
28
31
75
80
30
35
78
85
33
40
82
89
37
44
85
94
40
49
88
99
43
54
58
092315
Medium Power Film Capacitors
FFHV/FTHV 1500Vdc to 3000Vdc
Based on Return Of Experience from the field of more than 30 years, we have established the following relation.
The failure rate
λ
B
depends on hot spot temperature
θ
HS
and charge ratio
ρ.
ρ
= U
w
/U
n
(
(
)
)
in failures/hour
GENERAL FAILURE RATE
λ=λ
B
x π
Q
x π
B
x π
E
failures/hour • π
Q
, π
B
and π
E
see following tables
Qualification
Product qualified on IEC61071
and internal qualification
Product qualified on IEC61071
Product answering on
another norm
Product without qualification
Qualification
factor πQ
1
2
5
15
On
On
On
On
On
Environment
ground (good conditions)
ground (fixed materials)
ground (on board)
ship
plane
Environment
factor πE
1
2
4
9
15
Environment
Favorable
Unfavourable
Environment
factor πB
1
5
MEAN TIME BETWEEN FAILURE (MTBF)
MTBF = 1/λ hours
SURVIVAL FUNCTION
N = N
0
x exp (-λt)
N is the number of pieces still working after t hours.
N
0
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.
092315
59
DC FILTERING
MTBF CALCULATION
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