substation layout

5/28/2018 Substation Layout

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ELECTRICALSUBSTATIONDESIGN1/15


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GENERAL

Client/Electrical Inspector for perfect party wall betweenHV and LV rooms.

Philosophy of distribution of equipments controlled fromeach substation discussed with clients.

Area of distribution and load considered for deciding thenumber of substations.

Substation not lie with in classified zone.

Location of substation with respect to equipmenterection, maneuvering, space for entry and exit of

cables on trays. Communicate to piping on number of substation and

space requirement.

Substation have cellar/trench has to be discussed withclients and civil.

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SUBSTATION SIZING

List of the Equipments to be housed in the substation

should be prepared.

Allocated space for expansion, surprise panels.

Record of all work sheets for sizing of boards, etcAllow space in vertical height of floor for pressurisation

ducts.

Discuss with instrument group, mechanical group for

space required by them for their panels, pressurisationsystem, etc.

Preliminary layout for arriving at size of substation and

prefer to keep 1200 rear, 2000 for LV front and 2500 for

HV / MV front clearances.3/15


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7) Space should be allotted for :-

Electrical engineers office.

Spares room / store room.

Convenience requirements like toilet.

Blower room (when substation is pressurised).

8) Clients approval is necessary before releasing for

civil design.

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Contn..


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CELLAR

Bottom of beam of cellar at minimum of 2100 above

FFL of cellar.

Clients concurrence to keep bottom most tray at

900 above cellar FFL.

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CIVIL /ARCHITECTURAL

REQUIREMENTS

Detailed drawing of Door location,

Window locations

Ventilators fixed or Z

Identified Fireproof Walls Rolling shutters. Particular attention for height of rolling

shutters.

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REQUIREMENTS

Location of stairs as per requirements.

Indication of loading bay giving particular attention

to width of bay, open to sky.

Indication of opening in wall for. Erection of equipment

Cable tray entry / exit

Bus ducts


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REQUIREMENTS

Indication of the panel cut-outs with nosing channels forsubstation floor.

Discussion with civil for expansion joints in case of longsubstation

Expansion joints is shifted it beyond the largest board layout.

Marked column / location with respect to requirements

If specific columns is avoided than mention it.

If cross beams below panel cut-out is not allowed than

highlighted it to civil. If lintel beam level / is fixed ,give a hold and inform civil.

Windows and ventilators and tie beams are not provided intransformer bay to avoid bus duct clash with windows,ventilators. 8/15


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REQUIREMENTS

Study tray routing plan in the cellar to give the IP, sleeve

requirements to the civil group

Allocation of distance between pipe rack and substation

tray entries for manoeuvring the cable tray bends, fall of

trays and again a horizontal bend. Tray route entering substation and mark columns which

may have to be extended for supporting cable tray

structures.

location of columns of cable supporting structure at thedrop / rise outside the Substation and inform civil

Requirement of a structural stub columns in cellar for

slab / cable tray support.9/15


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REQUIREMENTS

Indication of sleeves for beam and floor marked.

ARCH. Drawing must have:-

Insert Plate of ceiling for bus duct support Insert Plate on ceiling for lighting tray support

Sleeves in beam, put a note that the sleeves shall also

be provided on any secondary beams

Floor sleeves for lighting Cable

Slots along the wall / array of sleeves along wall for any

future surprise panels

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TRANSFORMER YARD

Points applicable when transformer yard is part ofsubstation building:-

Floor finish shall be Pcc(Sheet) with gravel or onlygravel.

Space provision for NGR / cooling control Cabinets. Decide transformer bay size based on transformer size

and put limitation on transformer dimensions.

Prepare transformer foundation drawing based onVendor GA drawing

Typical foundation drawings for previous projects to bereferred & provide foundation for bus duct support.

Adequate number of sleeves in the wall betweentransformer yard and substation for HV power and LVcontrol cables.


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TRANSFORMER YARD

Trenches in transformer yard for HV Cable andsufficient space for bending and terminating of cablebelow HV Cable box.

Soak pit / catch pit, interconnection of catch pit and soakpit, as applicable with proper slopes.

Roof from transformer yard for dusty plants inconsultation with Client / process licensor.

Isolator arrangement consider in transformer yardwhere essential .

Pipe rack in front of transformer bay, raise the pipe Civil to match pipe rack

Columns running near sub-station to be in line with Sub-station columns. 12/1

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SUBSTATION VENTILATION

Pressurisation of substation and air-conditioning of

certain rooms where UPS, VSD, etc. are located

and inform Civil.

Mechanical and civil for ventilation requirement of

the cellar and eq. area.

Clarification in whose scope exhaust fan will be

included.

Specification of exhaust fan with louvers.

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REVIEW OF DRAWINGS

Design review meeting with mechanical, civil,

piping, instrument for joint discussion and sign on

check print of substation drawing.

Highlight important points as MOM.

Review all Arch. Drawing & RCC / Structural

Drawings to check to meet as per requirement.

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THANK YOU

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substation layout

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