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7 typical layout designs of 11kV indoor distribution substation
7 typical layout designs of 11kV indoor distribution substation (photo credit: fima.lt)

11kV Indoor distribution substation

The following layout designs of indoor distribution substation are typical only and should not be used as construction drawings as they are presented as an example. Some designs achieve minimum EMF emission by installing the low voltage cables and switchboard in a trench down the middle of the room. This adds substantially to the space requirements.

It is possible to reduce this space but only by sacrificing EMF containment!

The substations are designed for rated voltage 11 kV and 1500 kVA transformers. The space requirements for 22 kV padmount transformers need to be checked and it depends on manufacturer.

A drainage pit outside the substation is shown as optional. It can be installed if drainage is an issue or if needed to ease cable installation. Each substation is unique and the space requirements shown in the sample layouts may not be available.

The following rules should be followed when designing odd shaped substations:

  • Size of transformer = 2000 × 2000 mm
  • Transformer clearance to walls and other transformers = 500 mm
  • Allow room to replace any transformer whilst other equipment is alive.
  • LV and HV switchgear:
    • clearance at front = 1500 mm
    • clearance at sides = 500 mm
  • The LV and HV switchgear should be near the door.
  • A clear passageway at least 1000 mm wide shall be allowed from each item of switchgear to the access door.

Layout design drawing 1 //

Indoor distribution substation layout with:

  • 1 transformer
  • LV switchboard
Indoor distribution substation layout with 1 transformer and LV switchgear
Indoor distribution substation layout with 1 transformer and LV switchgear

Layout design drawing 2 //

Indoor distribution substation layout with:

  • 1 transformer
  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
Indoor distribution substation layout with 1 transformer and LV/HV switchboards
Indoor distribution substation layout with 1 transformer and LV/HV switchboards

Layout design drawing 3 //

Indoor distribution substation layout (OPTION A) with:

  • 3 transformers
  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
Indoor distribution substation layout with 3 transformers and LV/HV switchgears
Indoor distribution substation layout with 3 transformers and LV/HV switchgears

Layout design drawing 4 //

Indoor distribution substation layout (OPTION B) with:

  • 3 transformers
  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
Indoor distribution substation layout with 3 transformers and LV/HV switchgears
Indoor distribution substation layout with 3 transformers and LV/HV switchgears

Layout design drawing 5 //

Indoor distribution distribution substation layout with:

  • 1 transformer with EMF contaiment
  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
Indoor distribution substation layout with 1 transformer and EMF containment
Indoor distribution substation layout – LV/HV switchgears and 1 transformer with EMF containment

Layout design drawing 6 //

Indoor distribution substation layout with:

  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
  • 2 transformers with EMF containment
  • 1 external wall
Indoor distribution substation layout with 2 transformers EMF containment and 1 external wall
Indoor distribution substation layout – LV/HV switchgears, 2 transformers with EMF containment and 1 external wall

Layout design drawing 7 //

Indoor distribution substation layout with:

  • LV switchgear
  • HV switchgear (RMU – Ring main unit)
  • 3 transformers with EMF containment
  • More than 1 external wall
Indoor distribution substation layout with 3 transformers, EMF containment and more than 1 external wall
Indoor distribution substation layout with 3 transformers, EMF containment and more than 1 external wall

Reference // Indoor distribution substation design standard by Ergon Energy

About Author //

author-pic

Edvard Csanyi

Edvard - Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV high power busbar trunking (<6300A) in power substations, buildings and industry fascilities. Designing of LV/MV switchgears.Professional in AutoCAD programming and web-design.Present on

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