(kombsnitt)=

# Monitored interconnections, flow boundaries and outages

The file `KOMBSNITT.DAT` contains input for:
- Interconnections with power flow monitoring
- Maximum flow limit
- Outages
- End-of-file

The file format follows:

```text
First line: Total number of monitored interconnections

Then, for each of the monitored interconnections:

Line 1: Name From, Name To,
Line 2: No. of lines in intercon. (NL), Cap. From-To, Cap. To-From, No. of revisions (NR),
Line 3: (3+NR):
  From Week, To Week, Capacity out From, Capacity out To,
Line (4+NR): (4+NR+NL):
  Busbar From, Busbar To, Share From, Share To, Describing text,
1,1,                          # Dummy: not relevant for Samnett, but must be included
1,1,
```

|Note|
|-|
|	`Share From` and `Share To` must in the range -1.0 <= Share <= 1.0. If not, a warning message is written to WLog.txt and the factor is changed by the model to meet the boundaries.|
|	A connection between the same two nodes should only be registered once. Samnett will automatically discover and add parallel lines.|
| It is important that the N interconnections in {ref}`EFI-SNITT.DAT <efi_snitt>` are **identical and in the same order** as the N first transport channels in {ref}`MASKENETT.DATA <maskenett>` and `KOMBSNITT.DAT`.|
| - Capacity outage modelled in `KOMBSNITT.dat` will not directly impact the load flow and PTDF computations in Samnett. It will only limit the left- and right-hand side of the PTDF-constraints. Optionally, the capacity outages specified in the {ref}`linjerevisjon.csv <linjerevisjon>` file will impact the load flow and PTDF computations. |

## Simple example file

```text
3,                                                           # Interconnections
'numedal','tev',                                             # Interconnection: name from, name to
1,  200.000000,  200.000000,0,                               # Interconnections: Number of lines, capacity from [MW], capacity_to [MW], number of outages
10007,20008,    1.000000,    1.000000,                       # Line: Busbar from, busbar to, share from, share to
   1,   1,                                                   # Dummy: not relevant for Samnett, but must be included
   1,   1,
'tev','otra',                                                # Interconnection: name from, name to
2,  200.000000,  200.000000,0,                               # Interconnections: Number of lines, capacity from [MW], capacity_to [MW], number of outages
20022,30013,    1.000000,    1.000000,                       # Line: Busbar from, busbar to, share from, share to
20022,30014,    1.000000,    1.000000,
   1,   1,                                                   # Dummy: not relevant for Samnett, but must be included
   1,   1,
'numedal','otra',                                            # Interconnection: name from, name to
1,  200.000000,  200.000000,0,                               # Interconnections: Number of lines, capacity from [MW], capacity_to [MW], number of outages
10021,30023,    1.000000,    1.000000,                       # Line: Busbar from, busbar to, share from, share to
   1,   1,                                                   # Dummy: not relevant for Samnett, but must be included
   1,   1,
  -1,                                                        # End of file
```
(revisions)=

## Outages (revisions)

In the following we described how to model revisions in KOMBSNITT.DAT through an example.

```text
'FINNMARK','TROMS',
3,800,270,2,            # Revisions
1,10,-600,-400,         # from week; to week; capacity reduction in pos. direction [MW]; capacity reduction in neg. direction [MW]
21,22,-400,-400,        #  from week; to week; capacity reduction in pos. direction [MW]; capacity reduction in neg. direction [MW]
58521,58051,1.0,1.0,
58503,58053,1.0,1.0,
58513,58483,1.0,1.0,
```

On the second line and fourth column we define the number of outages to be read (2). On the third and fourth lines these outages are defined on the following format:

```text
from week; to week; capacity reduction in pos. direction [MW]; capacity reduction in neg. direction [MW]
```

The first capacity outage between areas FINNMARK and TROMS last from week 1 to 10 and reduces capacity in the direction towards TROMS by 600 MW and towards FINNMARK by 400 MW. Capacity reduction can be defined as positive or negative numbers, both are treated as reductions.

## End-of-file

The end-of-file marker is -1. When the marker is found file parsing ends.