/*************************************************************************
* This file format is based on http://www.dejazzer.com/reds.html with some
* minor modification:
* - one optional column is added to the branch data to identify
*   the branch rating.
* - one optional column is added to the tie switch data to identify
*   the branch rating.
* - the placement of each buses was removed
* 
* The details are explained below using the 16-bus test case as an example
/*************************************************************************
.PU 1                                           // 0 if branch R and X are in ohms, 1 if in p.u.
.V_base 23                                      // base voltage in kV
.S_base 100                                     // base power in MVA
.Branch_count 16                                // Total number of branches
.Sectionalizing_count 13                        // Number of sectionalizing branches
.Tie_count 3                                    // Number of tie switches
.Nodes 16                                       // Number of nodes
.Feeders 3                                      // Number of feeder buses
.Feeder_node_ids 0 1 2                          // IDs of the feeder buses (the number of item must match the previous line)

// The next lines contains the branch data which include in order:
// Branch        the index of the branch
// Src_bus       the bus ID at the source end
// Rec_bus       the bus ID at the receiving end
// R             the branch resistance (Ohms or p.u.)
// X             the branch reactance (Ohms or p.u.)
// PL            real power load at receiving bus (kW)
// QL            reactive power load at receiving bus (kVAR)
// Br_rating_a   [optional] the branch rating (A)
.Branch Src_bus Rec_bus R X PL_kw QL_kvar Br_rating_a(optional) S_NS
0 1 4 0.075 0.1 2000 1600 S
1 4 5 0.08 0.11 3000 400 S
2 4 6 0.09 0.18 2000 -400 S
3 6 7 0.04 0.04 1500 1200 S
4 2 8 0.11 0.11 4000 2700 S
5 8 9 0.08 0.11 5000 1800 S
6 8 10 0.11 0.11 1000 900 S
7 9 11 0.11 0.11 600 -500 S
8 9 12 0.08 0.11 4500 -1700 S
9 3 13 0.11 0.11 1000 900 S
10 13 14 0.09 0.12 1000 -1100 S
11 13 15 0.08 0.11 1000 900 S
12 15 16 0.04 0.04 2100 -800 S

// The next lines contains the tie switches data which include in order:
// Tie           the index of the branch
// Src_bus       the bus ID at the source end
// Rec_bus       the bus ID at the receiving end
// R             the branch resistance (Ohms or p.u.)
// X             the branch reactance (Ohms or p.u.)
// Br_rating_a   [optional] the branch rating (A)
.Tie Src_bus Rec_bus R X Br_rating_a(optional)
13 5 11 0.04 0.04
14 10 14 0.04 0.04
15 7 16 0.12 0.12