TDK Corporation has extended its range of EPCOS MKK power capacitorsThis is a general term referring to capacitors that handle large currents or high voltages, can be used in charging systems, and applications in electrical distribution systems.. The new MKK DCi-R series B25640* with resin impregnation is based on the proven MKK DC series with gas impregnation and MKK DC-I with oil impregnation.

The new series features capacitors that are rated at up to more than 10 000 μFUnit of capacitance. The basic unit of a measure of a capacitor. A capacitor charged to 1 volt with a charge of 1 coulombA coulomb is the unit of electric charge. It is named after Charles-Augustin de Coulomb.1 coulomb is the amount of electric charge transported by a current of 1 ampere in 1 second. It can also be defined in terms of capacitance and voltage, where one coulomb is defined as one farad of capacitance times one volt of electric potential difference. would have a capacitance of 1 farad. 1 microF = .000001 Farads. and designed for voltages of up to 4000 V DC. The energy densityA figure of merit usually expressed in Joules per cubic inch for capacitorsA figure of merit usually expressed in Joules per cubic inch for capacitorsA figure of merit usually expressed in Joules per cubic inch for capacitors of the new resin impregnated capacitors is about 10 percent higher than that of the gas-impregnated types. Moreover, the flat winding technology allows a volume fill factor of about 95 percent to be achieved, so that highly compact components can be realized.

Thanks to their rugged design, these capacitors are characterized by their high current capability and their ability to withstand high voltage and current peaks. In addition, the more highly developed internal structure of the new MKK DC-I series assures better heat dissipation from internal hot spots via the capacitor case.

The new improved MKK DCi-R capacitors satisfy even the most demanding requirements on reliability and enable an operating life of up to 40 years with failures in time (FIT) of less than 100. Depending on the type, the new design permits ESRLow Equivalent Series Resistance values of down to 0.1 mΩ and ESLLow equivalent series inductance. values down to 20 nH. The new capacitors are self-healing. Their main applications are in large traction converters and HVDC systems.