Three-phase chokes du/dt for various frequency converters


Chokes du / dt are applicable in driving systems in the output of frequency converters. The task of chokes du / dt is to limit the steepness of voltage rise. This feature increases the life time of the device by protecting the isolation from damage, reducing operating temperature and reducing motor noise. In addition they allow to increase the motor main cable length from 30 up to 100 meters depending on the keying frequency. These chokes also reduce the propagation of electromagnetic disturbances.
The series of chokes du / dt has been designed on the basis of output currents of the leading manufacturers of frequency converters. Their versatility lies in the possibility of operation at varying load at the inverter (with constant or variable torque).
If agreed beforehand, it is possible to manufacture chokes with parameters other than those given in the table.

Technical data

Design Chokes are produced according to :
EN/IEC 60076-6; EN/IEC 61558-2-20
Insulation class

F(155oC) - standard

Climatic class
/environmental class

C1/E0 - land design; C2/E1 - maritime design

Ambient temperature 40oC
Protection degree IP 00
Keying frequency 2-16 kHz
Frequency of the 1-st harmonic 50/60 Hz
Rated voltage Un=400 V
Overload capacity 110%In
Short circuit voltage 0,7-1,2%
Terminals screw terminal blocks or cable lugs or copper bus bars
Fastening by means of angles