in dc motors we use line reactor after the drive output & befor the high speed circuit breaker .it is significant & why we cannot use the line reactor after the HSCB.
I assume you have a regenerative drive and the HSCB is your inverting fault protection.
On a six pulse SCR system on a single isolation transformer sized for motor and drive, output reactors are generally not required for variable speed SCR duty rated motors such as Reliance RPM 3 series motors.
However, if you have an older DC machine without a laminated frame the core losses become excessive, and commutation may become problematic. In these cases we recommend DC link chokes to smooth the DC ripple. These are large sized reactors since they handle a large DC component. If these are the reactors you mention, it usually does not significantly matter where the HSCB is placed, and we choose the best circuit arrangemnt for the easiest cabling .
If you have multiple drives on a common transformer then a network of AC line side reactors along with possible RC circuits to guarantee stability are used to provide notch seperation between the drives. Since the fundamental is AC at line frequency the physical size of the reactors is smaller than a DC side choke.
Line Reactor Positioning
Re: Line Reactor Positioning
