Film Capacitors – Power Electronic Capacitors B25631*
MKP DC-LSI
CAP FILM P PM October 2013
Please read Cautions and warnings and Page 4 of 9
Important notes at the end of this document.
Terms and Definitions
The following definitions apply to power capacitors according to IEC 61071.
Rated capacitance C
R
Nominal value of the capacitance at 20 °C and measuring frequency range of 50 to 120 Hz.
Rated DC voltage V
R
Maximum operating peak voltage of either polarity but of a non-reversing type wave form, for which
the capacitor has been designed, for continuous operation.
Ripple voltage V
r
Peak-to-peak alternating component of the unidirectional voltage.
Maximum surge voltage V
s
Peak voltage induced by a switching or any other disturbance of the system which is allowed for a
limited number of times and duration.
- Maximum duration: 50 ms / pulse
- Maximum number of occurrences: 1000 (during load)
Insulation voltage V
i
Rms rated value of the insulation voltage of capacitive elements and terminals to case or earth. When
it is not specified in the product data sheet, the insulation voltage is at least:
V
i
=
2
RV
Maximum rate of voltage rise (dv/dt)
max
Maximum permissible repetitive rate of voltage rise of the operational voltage.
Maximum current I
max
Maximum rms current for continuous operation.
Maximum peak current Î
pk
Maximum permissible repetitive current amplitude during continuous operation.
Maximum peak current (Î
pk
) and maximum rate of voltage rise (dV/dt)
max
on a capacitor are related as
follows:
Î
pk
= C · (dv/dt)
max
Maximum surge current Î
s
Admissible peak current induced by a switching or any other disturbance of the system which is
allowed for a limited number of times (1000 times) and duration (50 ms / pulse).
Î
s
= C · (dv/dt)
s
Ambient temperature Θ
A
Temperature of the surrounding air, measured at 10 cm distance and 2/3 of the case height of the
capacitor.
