Film capacitors deliver high dielectric strength for wind power plants

September 15, 2011 // By Paul Buckley
TDK-EPC, a group company of TDK Corporation, has released new EPCOS power capacitors with higher rated voltages from 550 VRMS AC up to 1000 VRMS AC. The MKP AC HP B25360 series covers a capacitance range from 10 to 150 µF.

The high dielectric strength of the devices is made possible by a castor oil filling. Another advantage of their new design lies in the improved heat dissipation from the capacitor’s interior to the aluminum can. In addition, hot spots are reduced and superior insulation properties are achieved, thus extending the operating life of the components to 100 000 hours (to IEC 61071). The capacitance changes by no more than three percent.

 Thanks to their high rated voltage, long operating life and high current handling capability, the capacitors are well suited for renewable energy generation applications, such as for AC output filters in offshore wind turbines.

 The components are designed for a temperature range from -40 to +70 °C. M10 screw terminals assure a reliable electrical connection. The terminals can be modified according to the specific requirements of the customer or application. The cans have diameters of 75 or 85 mm. Their heights are between 115 and 270 mm.

The overpressure disconnector means that the capacitors represent no hazard in the event of overload. Like all EPCOS film capacitors, the new series is also self-healing: sparkovers due to excessive voltages do not short-circuit or destroy the capacitor.

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