Connection to the utility network: Difference between revisions
From Electrical Installation Guide
m (Christian Collombet moved page Connection to the upstream network to Connection to the utility network) |
(Text modified (guide 2015)) |
||
| Line 1: | Line 1: | ||
{{Menu_MV_and_LV_architecture_selection_guide}} | {{Menu_MV_and_LV_architecture_selection_guide}} | ||
<br> | <br> | ||
The | The possible solutions for the connection of an installation to the utility network are the following: | ||
*LV | * Connection to the LV network for small and medium size installations requiring less than 400 kVA. Fixing this limit is always under the responsibility of the local utility managing the LV network | ||
*MV single | * Above this previous limit, connection to the MV network with either LV or MV metering. LV metering is generally authorized for installation including a single MV/LV transformer not exceeding the rated power limit fixed by the utility, generally around 1250 kVA. | ||
The possible connections to a MV utility network are the following, (see '''Fig. D8, D9 and D10):''' | |||
---- | - MV single-line service,<br> | ||
- MV ring-main service,<br> | |||
- MV duplicate supply service, including two load break switches equipped with an automatic change over,<br> | |||
- MV dual supply service with two independent connections to the utility and two bus bars connected with a bus tie. The two utility incomers and the bus tie are equipped with an automatic change over. | |||
Comparison of this four modes of connection are summarized in '''Fig. D7''' | |||
{| class="wikitable" style="width: 65%; height: 187px" | {| class="wikitable" style="width: 65%; height: 187px" | ||
| Line 35: | Line 27: | ||
! Characteristic to <br>consider | ! Characteristic to <br>consider | ||
! | ! | ||
! | ! Single-line | ||
! Ring-main | ! Ring-main | ||
! Duplicate supply | ! Duplicate supply | ||
! | ! Dual supply | ||
|- | |- | ||
| Activity | | Activity | ||
| Line 44: | Line 36: | ||
| Any | | Any | ||
| Any | | Any | ||
| | | High tech, sensitive office, health-care | ||
| | | Very sensitive installations | ||
|- | |- | ||
| Site topology | | Site topology | ||
| Single building | | Single building | ||
| Single building | | Single building | ||
| Single | | Single or several buildings | ||
| Single | | Single or several buildings | ||
| | | Single or several buildings | ||
|- | |- | ||
| Service reliability | | Service reliability | ||
| Line 59: | Line 51: | ||
| Standard | | Standard | ||
| Enhanced | | Enhanced | ||
| | | Very high | ||
|- | |- | ||
| Power demand | | Power demand | ||
| < | | < 400 kVA | ||
| ≤ 1250kVA | | ≤ 1250kVA | ||
| | | Any | ||
| | | Any | ||
| | | Any | ||
|- | |- | ||
| Other connection constraints | | Other connection constraints | ||
| Line 73: | Line 65: | ||
| Low density urban area | | Low density urban area | ||
| High density urban area | | High density urban area | ||
| | | Dedicated measures taken by the utility | ||
|} | |} | ||
'''Fig. D7:''' Comparison of the modes of connection | |||
<br> | <br> | ||
Revision as of 10:57, 5 December 2014
The possible solutions for the connection of an installation to the utility network are the following:
- Connection to the LV network for small and medium size installations requiring less than 400 kVA. Fixing this limit is always under the responsibility of the local utility managing the LV network
- Above this previous limit, connection to the MV network with either LV or MV metering. LV metering is generally authorized for installation including a single MV/LV transformer not exceeding the rated power limit fixed by the utility, generally around 1250 kVA.
The possible connections to a MV utility network are the following, (see Fig. D8, D9 and D10):
- MV single-line service,
- MV ring-main service,
- MV duplicate supply service, including two load break switches equipped with an automatic change over,
- MV dual supply service with two independent connections to the utility and two bus bars connected with a bus tie. The two utility incomers and the bus tie are equipped with an automatic change over.
Comparison of this four modes of connection are summarized in Fig. D7
| Configuration | |||||
|---|---|---|---|---|---|
| LV | MV | ||||
| Characteristic to consider |
Single-line | Ring-main | Duplicate supply | Dual supply | |
| Activity | Any | Any | Any | High tech, sensitive office, health-care | Very sensitive installations |
| Site topology | Single building | Single building | Single or several buildings | Single or several buildings | Single or several buildings |
| Service reliability | Minimal | Minimal | Standard | Enhanced | Very high |
| Power demand | < 400 kVA | ≤ 1250kVA | Any | Any | Any |
| Other connection constraints | Any | Isolated site | Low density urban area | High density urban area | Dedicated measures taken by the utility |
Fig. D7: Comparison of the modes of connection
