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RFI 电容Radio interference suppression capacitors
must not only satisfy EMC requirements in suppressing outgoing
interference from an application but they must also protect the
application from incoming power surges. Hence careful selection of
these components is essential.
The special feature of WIMA
Polypropylene RFI capacitors are the high capacitance values at
smaller case sizes compared to metallized paper capacitors, being
available up to 2.2 μF with AC voltages of 275 VAC and 300 VAC for
class X2 and Y2 . Based on the dielectric used they are highly
cost-effective.
WIMA metallized paper are neither actively
nor passively flammable. The components are resin impregnated under
vacuum and encapsulated with self-extinguishing cast resin. Thanks
to the good oxidation behaviour of the paper dielectric, they have
outstanding self-healing properties even with high energy pulses.
The capacitors are specified for temperatures up to 110° C and are
available for class X1, X2 and Y2 applications.
Class X
capacitors are connected between phase and neutral or phase and
phase conductors. Class Y capacitors have an increased degree of
electrical and mechanical safety and are connected, for example,
between phase conductors and earthed casing, and thus by-pass
operating insulation.
The specified rated AC voltage takes
into account a rise of the mains voltage of up to 10% above the
nominal value, in accordance with IEC
60384-14. |
