Civil construction for installing of transformer

The following factors are taken into consideration at the time of installing transformers.

Proper foundation-

• The foundation must be strong enough to bear the load of transformer without any vibration and must be made with proper floor label and plinth label.
• The label of concrete plinth should be above the maximum flood label.
• Suitable rail tracks should be provided where rulers are used with the transformer.

Proper spacing for movement or maintenance-

• Minimum clearance between the transformer and wall should be as walls on four side is 1.25 meter.
• Walls on three side= 1.1 meter
• Wall on back side only= 0.51 meter
• Wall on two sides= 0.75 meter
• Ventilation area for outlet= 2m² for 1000 KVA
• For inlet 1m² for 1000 KVA

Location of switchgear-

The switchgear should be installed in a separate room. And power and controlled cables should be run in separate conduit pipe.

Proper cable trenches-

The cable should be installed in proper trenches, conduits, ducts or metal channels to protect them from moisture or any mechanical damage.

Provision for drainage of oil-

• Provision should be made for proper drainage of oil leaking from transformer.
• Proper slop to maintain and soak peat filled with sand and gravel should be provided with manholes.
• Gravel should be spread all around.

Fire protection-

Carbon tetra-chloride and foam type fire extinguishers and buckets filled with sand should be kept, ready for this purpose.

Noise reduction-

The transformer must be mounted on a non reflecting resistance pad and non vibrating surface to reduce the noise label considerably.

Cable boxes-

Transformer is fitted with cable boxes and is connected by paper insulated power cables.

Provision of supports of bushing-

LT cables should be supported on wooden support along with angle iron to avoid bending of cables coming out of the transformer otherwise the bushing will be cracked.