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TDK Releases 3-phase AC Filter Nitrogen Filled Film Capacitors for Long Service Life at High Temperatures

12.9.2024
Reading Time: 2 mins read
A A

TDK Corporation announces the EPCOS B32377G, a new series of three-phase AC filter film capacitors in delta connection filled with nonflammable nitrogen gas instead of the soft polyurethane resin used in the existing series.

In line with the megatrend 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.

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These components, with a diameter of 75 to 136 mm and heights between 218 to 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. It shows low losses (tan ẟ) of 0.7 to 1.2 ∙ 10-3 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. 

 Features

  • 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

Applications

  • Input and output filters in inverter systems
  • Filtering of harmonic distortion in power inverters

Related

Source: TDK

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