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13.15 LTRA: Lossy transmission line

     
      ------------------------------------------------------------
     |          LTRA - instance parameters (input-only)          |
     |-----------------------------------------------------------+
     | ic                Initial condition vector:v1,i1,v2,i2    |
      ------------------------------------------------------------
     
      ------------------------------------------------------------
     |         LTRA - instance parameters (input-output)         |
     |-----------------------------------------------------------+
     | v1                Initial voltage at end 1                |
     | v2                Initial voltage at end 2                |
     | i1                Initial current at end 1                |
     | i2                Initial current at end 2                |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |          LTRA - instance parameters (output-only)         |
     |-----------------------------------------------------------+
     | pos_node1         Positive node of end 1 of t-line        |
     | neg_node1         Negative node of end 1 of t.line        |
     | pos_node2         Positive node of end 2 of t-line        |
     | neg_node2         Negative node of end 2 of t-line        |
      ------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |           LTRA - model parameters (input-output)          |
     |-----------------------------------------------------------+
     |ltra            LTRA model                                 |
     |r               Resistance per metre                       |
     |l               Inductance per metre                       |
     |g               (null)                                     |
      ------------------------------------------------------------
     |c               Capacitance per metre                      |
     |len             length of line                             |
     |nocontrol       No timestep control                        |
     |steplimit       always limit timestep to 0.8*(delay of line)
     |                         continued                         |
      ------------------------------------------------------------
     
      ---------------------------------------------------------------------
     |                 LTRA - model input-output parameters - continued    |
     |---------------------------------------------------------------------+
     |nosteplimit    don't always limit timestep to 0.8*(delay of line)    |
     |lininterp      use linear interpolation                              |
     |quadinterp     use quadratic interpolation                           |
     |mixedinterp    use linear interpolation if quadratic results         |
     |               look unacceptable                                     |
      ---------------------------------------------------------------------
     |truncnr        use N-R iterations for step calculation in LTRAtrunc  |
     |truncdontcut   don't limit timestep to keep impulse response         |
     |               calculation errors low                                |
     |compactrel     special reltol for straight line checking             |
     |compactabs     special abstol for straight line checking             |
      ---------------------------------------------------------------------
     
     
      ------------------------------------------------------------
     |           LTRA - model parameters (output-only)           |
     |-----------------------------------------------------------+
     | rel               Rel. rate of change of deriv. for bkpt  |
     | abs               Abs. rate of change of deriv. for bkpt  |
      ------------------------------------------------------------