Internal MV circuits: Difference between revisions

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Internal MV circuits are dedicated to the supply of the secondary MV/LV substations dispersed in the installation. They are three typical principles commonly used for this purpose {{FigRef|D11}}:
The main possible connection configurations are as follows ('''Fig. D9'''):  
* Single feeder
* Dual feeder
* Open ring


*single feeder, one or several transformers
{{FigImage|DB422127_EN|svg|D11|Single feeder, Dual feeder, Open ring}}
*open ring, one MV incomer
*open ring, 2 MV incomers


The basic configuration is a radial single-feeder architecture, with one single transformer.<br>In the case of using several transformers, no ring is realised unless all of the transformers are located in a same substation.<br>Closed-ring configuration is not taken into account.  
Comparison of these three typical principles of internal distribution is given {{FigRef|D12}}.


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{{tb-start|id=Tab1084|num=D12|title=Comparison of the typical internal circuits|cols=3}}
 
{| class="wikitable"
<br>[[Image:FigD09.jpg|left|500x292px]] <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>'''''Fig. D9:'''&nbsp;MV circuit configuration''
 
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For the different possible configurations, the most probable and usual set of characteristics is given in the table on '''Fig D10.<br>'''
 
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{| style="width: 65%; height: 122px" cellspacing="1" cellpadding="1"  border="1"
|-
|-
| &nbsp;
|  
| bgcolor="#0099cc" colspan="3" | '''MV circuit configuration'''
! colspan="3" | MV circuit configuration
|-
|-
| bgcolor="#0099cc" | '''Characteristic to consider'''
! Characteristic to consider  
| bgcolor="#0099cc" | '''Single feeder'''
! Single feeder  
| bgcolor="#0099cc" | '''Open ring 1 MV substation'''
! Open ring  
| bgcolor="#0099cc" | '''Open ring 2 MV substations'''
! Dual feeder
|-
|-
| valign="top" | Site topology  
| Site topology  
| valign="top" | Any <br>&lt; 25000m²
| Any  
| valign="top" | Building with one <br>level or several buildings<br>≤ 25000m²
| Single or several buildings  
| valign="top" | Several buildings<br>≥ 25000m²
| Single or several buildings
|-
| Maintainability
| Minimal or standard
| Enhanced
| Enhanced
|-
|-
| Power demand  
| Power demand  
| Any  
| Any  
| &gt; 1250kVA  
| > 1250kVA  
| &gt; 2500kVA
| > 2500kVA
|-
|-
| Disturbance sensitivity  
| Disturbance sensitivity  
| Long interruption acceptable  
| Long interruption acceptable  
| Short interruption acceptable  
| Short interruption acceptable  
| Short interruption acceptable
| Short interruption not acceptable
|}
|}
'''''Fig. D10:'''&nbsp;Typical values of the installation characteristics''
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Another exceptional configuration: power supply by 2 MV substations and connection of the transformers to each of these 2 substations (MV “double ended” connection). <br><br>

Latest revision as of 09:48, 22 June 2022

Internal MV circuits are dedicated to the supply of the secondary MV/LV substations dispersed in the installation. They are three typical principles commonly used for this purpose Fig. D11:

  • Single feeder
  • Dual feeder
  • Open ring
Fig. D11 – Single feeder, Dual feeder, Open ring

Comparison of these three typical principles of internal distribution is given Fig. D12.

Fig. D12 – Comparison of the typical internal circuits
MV circuit configuration
Characteristic to consider Single feeder Open ring Dual feeder
Site topology Any Single or several buildings Single or several buildings
Power demand Any > 1250kVA > 2500kVA
Disturbance sensitivity Long interruption acceptable Short interruption acceptable Short interruption not acceptable
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