Internal MV circuits: Difference between revisions
From Electrical Installation Guide
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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}}: | |||
* Single feeder | |||
* Dual feeder | |||
* Open ring | |||
{{FigImage|DB422127_EN|svg|D11|Single feeder, Dual feeder, Open ring}} | |||
Comparison of these three typical principles of internal distribution is given {{FigRef|D12}}. | |||
- | {{tb-start|id=Tab1084|num=D12|title=Comparison of the typical internal circuits|cols=3}} | ||
{| class="wikitable" | |||
{| class="wikitable | |||
|- | |- | ||
| | | | ||
! colspan="3" | MV circuit configuration | ! colspan="3" | MV circuit configuration | ||
|- | |- | ||
! Characteristic to consider | ! Characteristic to consider | ||
! Single feeder | ! Single feeder | ||
! Open ring | ! Open ring | ||
! | ! Dual feeder | ||
|- | |- | ||
| Site topology | | Site topology | ||
| Any | | Any | ||
| | | Single or several buildings | ||
| | | Single or several buildings | ||
|- | |- | ||
| Power demand | | Power demand | ||
| Any | | Any | ||
| | | > 1250kVA | ||
| | | > 2500kVA | ||
|- | |- | ||
| Disturbance sensitivity | | Disturbance sensitivity | ||
| Long interruption acceptable | | Long interruption acceptable | ||
| Short interruption acceptable | | Short interruption acceptable | ||
| Short interruption acceptable | | Short interruption not acceptable | ||
|} | |} | ||
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 |
