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FPX RANGE
Capacitor for Power Electronics
Preliminary data sheet
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Preliminary data
FPX
Applications
Protection of thyristors .
Protection of gate turn off thyristor (GTO) .
Clamping (Secondary snubber) .
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Technology
Metallized polypropylene dielectric capacitor with controlled self healing .
Reinforced metallisation developed for high impulse currents .
Axial connections specially developed to reduce serial inductance and to provide rigid mechanical mounting .
Presentation
Cylindrical in plastic or epoxy case filled with thermosetting resin .
Outputs : threaded inserts M6 or M8 .
Electrical characteristics
Climatic category : 40/085/56 (IEC 68) .
Working Temperature : – 40 to + 85°C .
Hot spot temperature 85°C (must be calculated : see page up) .
Capacitance range : C = 0.5 µF to 6 µF .
Tolerance : ± 5 % .
Nominal dc voltage : Undc = 1000 to 3000 V .
Peak voltage :
Ucr = 1600 to 4000 V .
Allowable overvoltage : Us = 2000 to 4600 V 10 s per day .
RMS current : Irms max = 15 to 160 A .
Impulse current : I2t max = up to 729 A2s .
Spikes or peak currents in the capacitors may cause a deterioration of the bonding between the metallisation
and connections . These bonds are capable of withstanding only a limited amount of energy for each spike . The
table shows the maximum energy permitted in the form (I2.t), where I is in amps, and t is in seconds .
The formula (I2.t) replaces dV/dt which is less easy to use as it is not an expression of energy (I = C.dV/dt) .
This type of capacitor has been designed to withstand high (I2.t) values .
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FPX
Preliminary data
Stray inductance : 5 to 20 nH .
Variation of capacitance with temperature : ³C ± 2 % between – 40 and 85°C .
C
Test voltage between terminals : Us x 10 s 25°C .
wwWw.iDtahtsatSahneedti4nUg.covmoltage between terminals and case : > 4000 Vrms 60 s 50 Hz .
Standards
IEC 1071-1, IEC 1071-2 : Power electronic capacitors .
IEC 68 -1 : Environmental testing .
UL 94 : Fire requirements .
Hot spot temperature calculation
Hot spot = θ connection + ( Pd + Pc ) x Rth .
with
Pd (Dielectric losses) = Q x Tgδ0 ” [ 1/2 x C x (Upeak to peak)2 x Fr ] x (2 10–4).
Pc (Joule losses) = Rs x I2rms .
- C in Farad .
- U in Volts .
- Rs in
NOTE
Due to the design of the capacitor and its technology, the thermal impedance between the terminations and
the core of the capacitor is low, it is necessary to take care that the capacitor is never overheated by use of
wrongly-sized connections.
In the case where the series diode are screwed to the capacitor, cooling of the diode must be taken into account.
Do not use the capacitor as a heat sink.
Due to the complexity of the diode /capacitor thermal exchanges, we recommand that thermal measurements
shall be made on the different components. We would be pleased to advice you on specific problems.
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Preliminary data
Applications note
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FPX
GTO protection
Choice of voltage : U1 Upeak
U2 Undc
Nominal dc voltage (Undc) and peak voltage (Upeak) are given in the tables.
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Applications note
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FPX
THYRISTOR protection
Preliminary data
Choice of voltage : U1 Upeak
note that U1 is the voltage peak to peak and can be not symmetrical versus 0 V
Peak voltage is given in the tables.
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