Innovation for power electronics
- November 28 to 30, 2017
- Exhibition Centre Nuremberg
Karl-Schoenleben-Straße, Nuremberg, Germany
- Tuesday and Wednesday: 9:00 to 18:00
Thursday: 9:00 to 17:00
- Hall 4, TDK Stand 121
Welcome to TDK at SPS/IPC/DRIVES 2017, the international exhibition and conference for electric automation and drive technology in Nuremberg, Germany! On the TDK stand TDK is presenting its broad portfolio of EMC filters as well as chokes for converters. Convince yourself about the innovative EPCOS products. We’re looking forward to your visit!
Line reactors for up to 230 A
The EPCOS standard 3-phase line reactors are designed for frequency converters with input rectifier stages. Seven types in the B86305L* series cover a broad current range from 4 A to 230 A. These line reactors are designed for a rated voltage of 520 V AC and, depending on the type, for a short-circuit voltage of 5 percent to 6 percent. They are thus able to efficiently suppress any EMI caused by the frequency converters. The line reactors are also characterized by their high saturation strength. As a result, their inductance remains constant up to 1.5 times the rated current. Even at three times the rated current, the inductance remains above 60 percent of its rated value. The reactors of the B86305L*R000 and S000 series are manufactured with a UL-approved insulation system that meets class F requirements. While the types for rated currents of up to the 60 A have copper windings and clamp terminals, the types for 100 A and 230 A feature aluminum band windings and busbar terminals.
LeaXield™ minimizes earth leakage currents
The EPCOS LeaXieldTM active filter module is a solution for the minimization of earth leakage currents in power drive systems with frequency converters. Leakage current can cause RCDs (residual current device) to trip. In some applications this means that RCDs with low thresholds such as 30 mA cannot be used, or only with substantial additional expense. The LeaXield active filter module is connected between the RCD (residual current device) and the EMC input filter of the converter in standard three-phase industrial power grids and does not require an additional power supply. LeaXield detects the common-mode currents on the load-side via a current sensing transformer. An amplifier generates an inverse of the leakage currents and feeds them to the power line via a capacitor network. This produces almost complete cancellation of the leakage currents. LeaXield is now designed for rated currents of up to 150 A for 3-phase grids at frequencies of 50/60 Hz and a rated voltage of 520 V AC. The new active filter can be used in systems with leakage currents of up to 1000 mA. Besides minimizing earth leakage currents, LeaXield active filter modules can also improve the EMC performance of power drive systems in the range up to around 500 kHz. The new active filter module achieves typical common-mode attenuation values of up to 30 dB at 4 kHz, 40 dB at 10 kHz, and 15 dB at 150 kHz.
LCL filters for recuperative frequency converter systems
The B84143*405 series of EPCOS LCL filters is especially suitable for recuperative frequency converter systems. These high-performance filters consist of a power choke, a capacitor bank with damping resistors and a robust choke. The corresponding filter circuits attenuate the clock frequencies so greatly that the IEC/TS 62578 recommendations for EMI emissions between 9 kHz and 150 kHz can be satisfied. Moreover, in combination with a recuperative frequency converter system, the LCL filters can significantly reduce the line-side harmonics to less than 5 percent. Thanks to the integration of the choke in the LCL filter, the recuperative unit can also be operated as a boost converter for higher DC link voltages. The LCL filters are designed for rated currents of 16 A, 66 A, 200 A, and 400 A at a rated voltage of 520 V. The two smaller versions (16 A and 66 A) are accommodated on a mounting plate for ease of use. The larger versions (200 A and 400 A) consist of two units: a separate storage choke and a mounting plate with power choke and capacitor bank. The filters are designed for clock frequencies of 7 kHz to 16 kHz for the feedback module and 4 kHz to 16 kHz for the motor-side frequency converter module. In addition, they are designed for a maximum motor lead length of 150 m or 6 axles and a maximum motor frequency of 100 Hz.