RAILSIM LFA's capabilities are expanded to include Alternating Current (AC) system analysis with the AC LFA add-on module. As with any LFA analysis, the base database is defined and maintained in RAILSIM Editor.

RAILSIM LFA supports detailed modeling of mutual impedances through the
Mutual Impedance Group Editor shown here.

LFA AC supports the definition of:

• AC substations
• Autotransformers
• Booster Transformers
• Capacitors
• Mutual Impedances at user-controlled intervals, using a graphical cross-sectional diagram.

Defining/Editing an AC Substation with Booster Transformers in RAILSIM Editor, where feeders and returns, custom substation loads, and capacitors are also defined, as are AutoTransformers (when present).  Click the image to view more.

AC LFA uses unconstrained power demand profiles for each simulated train from RAILSIM TPC. For AC LFA models, these power demand profiles reflect user specification of:

• Power Factor Curves, detailing real versus reactive power demand as a function of train velocity, and
• Power Factor for Auxiliary kW Load, specified individually for each locomotive, multiple unit car or passenger coach in the train.

AC LFA Typical Output

AC LFA analysis reports are generated via the same text report and plot wizards used for DC reports.  The added information required for AC analysis interpretation is automatically included.

RAILSIM generates a System Snapshot report in both polar (at top) and complex (at bottom) formats for an AC analysis.  Click the image to see more.