TDK Launches 3-Phase AC Filter Capacitors Filled with Nitrogen Gas for Long Service Life and High Temperatures

­TDK Corporation announces the EPCOS B32377G, a new series of three-phase AC filter capacitors in delta connection filled with nonflammable nitrogen gas instead of the soft polyurethane resin used in the existing series. In line with the megatrends of the electrification of mobility and renewable energies, these capacitors suppress harmonic distortions and reduce reactive power at the input and/or the output of inverters. As a result, they improve the power quality and can make applications more reliable, such as wind and solar energy as well as industrial drives.

These components, with a diameter of 75 to 136 mm and heights between 218 and 351 mm, range from 3 x 15 µF to 3 x 330 µF with rated RMS voltages of 330 to 1000 V. As for lifetime expectancy at rated voltage, the series can operate for 250,000 hours at +70 °C at the hotspot, compared to the typical 100,000 hours of oil-filled components – and has a maximum hotspot temperature of +90 °C compared to the hotspot temperature of +85 °C for the oil-filled technology.

The winding construction is based on a metalized polypropylene film with self-healing properties. The components show low losses (tan ẟ) of 0.7 to 1.2 ∙ 10-3 (to the power of -3) and a high pulse-current withstand capability of up to 27.3 kA. Their maximal RMS current can be 82 A at +55 °C.

The components are equipped with overpressure disconnectors for all three phases to ensure controlled disconnection in case of overload. Cage clamps with M4, M5, or M6 are used as terminals.

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Main applications

• Input and output filters in inverter systems

• Filtering of harmonic distortion in power inverters

Main features and benefits

• Self-healing properties

• Low dissipation factor

• Delta connection for rated RMS voltages of 330 to 1000 V

• Filled with nitrogen gas, dry type

• Service life of 250,000 hours at a hotspot temperature of +70 °C and rated voltage

• Maximum hotspot temperature of +90 °C

Further information on the products can be found here.