Internal MV circuits: Difference between revisions
From Electrical Installation Guide
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The main possible connection configurations are as follows ('''Fig. D9'''): | The main possible connection configurations are as follows ('''Fig. D9'''): | ||
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'''''Fig. D9:''' MV circuit configuration'' | |||
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! colspan="3" | MV circuit configuration | |||
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! Characteristic to consider | |||
! Single feeder | |||
! Open ring 1 MV substation | |||
! Open ring 2 MV substations | |||
|- | |- | ||
| Site topology | |||
| Any <br>< 25000m² | |||
| Building with one <br>level or several buildings<br>≤ 25000m² | |||
| Several buildings<br>≥ 25000m² | |||
|- | |- | ||
| Maintainability | | Maintainability | ||
Revision as of 13:10, 15 November 2013
The main possible connection configurations are as follows (Fig. D9):
- single feeder, one or several transformers
- open ring, one MV incomer
- open ring, 2 MV incomers
The basic configuration is a radial single-feeder architecture, with one single transformer.
In the case of using several transformers, no ring is realised unless all of the transformers are located in a same substation.
Closed-ring configuration is not taken into account.
Fig. D9: MV circuit configuration
For the different possible configurations, the most probable and usual set of characteristics is given in the table on Fig D10.
| MV circuit configuration | |||
|---|---|---|---|
| Characteristic to consider | Single feeder | Open ring 1 MV substation | Open ring 2 MV substations |
| Site topology | Any < 25000m² |
Building with one level or several buildings ≤ 25000m² |
Several buildings ≥ 25000m² |
| Maintainability | Minimal or standard | Enhanced | Enhanced |
| Power demand | Any | > 1250kVA | > 2500kVA |
| Disturbance sensitivity | Long interruption acceptable | Short interruption acceptable | Short interruption acceptable |
Fig. D10: Typical values of the installation characteristics
Another exceptional configuration: power supply by 2 MV substations and connection of the transformers to each of these 2 substations (MV “double ended” connection).
