(efi_snitt)=

# Power grid areas

The power grid is divided (electrically) into areas in `EFI-SNITT.DAT`.

This file contains input for:
- Header (counter)
- Interconnections
    - End-point connection areas and busbars

|Note|
|-|
| It is important that the N interconnections in `EFI-SNITT.DAT` are identical and in the same order as the N first transport channels in {ref}`MASKENETT.DATA <maskenett>` and {ref}`KOMBSNITT.DAT <kombsnitt>`. These interconnections define the electrical division of areas. |

## Header counter

Defines the number of interconnections in the file.

Record format:

```text
<Number of interconnections>,
```

Example:

```text
3,
```

## Interconnections

Describes interconnections connecting two areas with corresponding busbars.

### Interconnection header

Interconnection line counter and connecting areas.

Record format:

```text
<Lines in interconnection>,<From area>,<To area>,
```

Fields:

-  1: Number of lines in the interconnection
-  2: From area
-  3: To area

Example:

The inteconnection consist of 2 lines between areas 2 and 3.

```text
2,   2,   3,
```

### Interconnection lines

Connection end-point busbars

Record format:

```text
<Busbar from>,<Busbar to>,<description>,
```

Fields:

-  1: Busbar from
-  2: Busbar to
-  3: Description (optional)

Example:

The interconnection consist of 2 lines between areas 2 and 3 as defined in the interconnection header.
The lines `N22 - N13` and `N22 - N14` connects busbars 20022 - 30012 and 20022 - 30014. Where busbar 20022 is in area 2 and busbars 30013 and 30014 are in area 3.

```text
20022,30013,N22 - N13,
20022,30014,N22 - N14,
```

## Example complete file

```
C, -- Definisjon av snitt mellom delomr�der --
C, -- Totalt antall snitt: 3 --
   3,
   1,   1,   2,
10007,20008,N7 - N8,
   2,   2,   3,
20022,30013,N22 - N13,
20022,30014,N22 - N14,
   1,   1,   3,
10021,30023,N21 - N23,
C,
FILNAVN=,
C,
```