Connection to the utility network: Difference between revisions
From Electrical Installation Guide
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The main configurations for possible connection are as follows (see '''Fig. D8 '''for MV service): | The main configurations for possible connection are as follows (see '''Fig. D8 '''for MV service): | ||
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[[File:FigD08.jpg|none|500px]] | |||
'''''Fig. D8:''' MV connection to the utilities network'' | |||
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{| style="width: 65%; height: 187px | {| class="wikitable" style="width: 65%; height: 187px" | ||
|- | |- | ||
| | | | ||
! colspan="5" | Configuration | |||
|- | |- | ||
| | | | ||
! LV | |||
! colspan="4" | MV | |||
|- | |- | ||
! Characteristic to <br>consider | |||
! | |||
! Simple-line | |||
! Ring-main | |||
! Duplicate supply | |||
! Duplicate supply <br>with double <br>busbars | |||
|- | |- | ||
| Activity | |||
| Any | |||
| Any | |||
| Any | |||
| Hi-tech, sensitive <br>office, health-care | | Hi-tech, sensitive <br>office, health-care | ||
| Any | |||
|- | |- | ||
| Site topology | | Site topology | ||
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| Urban area with utility constraint | | Urban area with utility constraint | ||
|} | |} | ||
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Revision as of 13:10, 15 November 2013
The main configurations for possible connection are as follows (see Fig. D8 for MV service):
- LV service,
- MV single-line service,
- MV ring-main service,
- MV duplicate supply service,
- MV duplicate supply service with double busbar.
Metering, protection, disconnection devices, located in the delivery substations are not represented on the following diagrams. They are often specific to each utilities company and do not have an influence on the choice of installation architecture.
For each connection, one single transformer is shown for simplification purposes, but in the practice, several transformers can be connected.(MLVS: Main Low Voltage Switchboard)
Fig. D8: MV connection to the utilities network
For the different possible configurations, the most probable and usual set of characteristics is given in the following table:
| Configuration | |||||
|---|---|---|---|---|---|
| LV | MV | ||||
| Characteristic to consider |
Simple-line | Ring-main | Duplicate supply | Duplicate supply with double busbars | |
| Activity | Any | Any | Any | Hi-tech, sensitive office, health-care |
Any |
| Site topology | Single building | Single building | Single building | Single building | Several buildings |
| Service reliability | Minimal | Minimal | Standard | Enhanced | Enhanced |
| Power demand | < 630kVA | ≤ 1250kVA | ≤ 2500kVA | > 2500kVA | > 2500kVA |
| Other connection constraints | Any | Isolated site | Low density urban area | High density urban area | Urban area with utility constraint |
