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Construction safety best practices for the industrial cement projects
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Learnings from project
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Sonadih2nd clinker line Project
Learning from Project
Part-3
-KV Siva ram sarma
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Learnings from project
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Sonadih2nd clinker line Project
7. Civil inputs for electrical buildings
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Learnings from project
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Sonadih2nd clinker line ProjectContents
1. Main Transformer
2. Switch yard gantries
3. Departmental substation
a. Distribution transformer rooms
b. MV & LV Switchgear
c. Capacitor rooms
d. PLC rooms
e. Cable cellar rooms
4. Central control room
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Learnings from project
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Sonadih2nd clinker line Project1.Main transformer
• Main transformer should be always out door type.
• Lafarge mandatory safety requirements for main transformer are to be followed.
• Main transformer to be mounted on at least 90 lb rails.
(Refer animation for the typical arrangement)
• Main transformer & the switch yard to be protected by a fence of at least 2.5 mtr height & the fence to be grounded at least two points.
• Main transformer neutral to be grounded separately with a separate color – Switch yard general earthing – Green color.Transformer neutral earthing – Black color.
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Learnings from project
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Sonadih2nd clinker line Project1.Main transformer- oil soak pit requirements
Courtesy – IE rules – 1956 Rev 2000
• The location of the oil soak pit should be out side the switch yard
• The capacity of the soak pit should be suitable for the entire oil capacity of the live transformer
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Learnings from project
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Sonadih2nd clinker line Project1.Main transformer-Cable trenches
Courtesy – IE rules – 1956 Rev 2000
It is preferred that the cable trenches in side switch yard are covered with concrete slabs
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Learnings from project
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Sonadih2nd clinker line Project1.Main transformer-Lightning protection
Courtesy – IE rules – 1956 Rev 2000
Out door switchyard is to be protected from lightning by suitable measures/ Lightning masts are to be provided & the calculations are to be submitted to CEIG .
Lightning protection drawings are also to be supplied by the designer.
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Learnings from project
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Sonadih2nd clinker line Project2.Switchyard towers & gantries
• Switchyard structures should be of bolted structures and should be of GI angular structures/ pipe structures.
• Switchyard structures should be low bay type.
• IPS aluminium tubular conductor type switchyard is preferred.
• Switchyard equipment creepage distances should be at least class-3 of IEC 34.
• The lightning arresters should be with min discharge current of 10 kA and should be metal oxide and gapless type.
• Each bay is to be supported by a breaker, Isolator with earth switch , set of CT,set of lightning arresters PT may be based on the requirement.
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Learnings from project
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Sonadih2nd clinker line Project3. Department substations – rooms lay out
• The substation rooms mainly contain two floors above FGL , cable cellar room & panel room.
• Typical elevation of an electrical room is shown below
False ceiling
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Finished ground level
Cable cellar room
PNL Height
AC & PV duct
Beam bottom
Cable tray
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Learnings from project
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Sonadih2nd clinker line Project3. Department substations - General
• The substation rooms mainly contain two floors above FGL , cable cellar room & panel room
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S.No Level Height from FGL for Aluminium cables
Height from FGL for Copper cables
1 Technical floor for MV substations & substations with high cable density
2.1 mtr beam bottom
2.1 mtr beam bottom
2 Technical floor for LV electrical rooms (Low cable density)
1.2 mtr beam bottom
1.2 mtr beam bottom
3 Panel height 2.2 mtr (working height) refer Lafarge std
2.2 mtr (working height) refer Lafarge std
4 Space between Panel & false ceiling
Not less than 0.8 mtr
Not less than 0.8 mtr
5 Space between false ceiling & room beam bottom
Not less than 0.8 mtr beam bottom for AC / Ventilation ducting provision
Not less than 0.8 mtr beam bottom for AC / Ventilation ducting provision
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Considered Aluminium armoured cables for Indian Scenario
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Sonadih2nd clinker line Project
3. Department substations –Cable cellar rooms
2.1 mtr
Cable tray
1.5 mtr
1.5
mtr
Cable cellar elevation Cable cellar Plan
Cable cellar typical arrangement shown below for the major substations for small LV elect rooms beam bottom of 1.2 mtr can be accepted instead of 1.8 mtr.
Inside cellar rooms adequate space and entry for inspection, laying & termination to be provided.
All the cable tray and supports should be of GI & should be mounted on insert plates.
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Learnings from project
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Sonadih2nd clinker line ProjectElectrical buildings