Civil construction for installing of transformer
The following factors are taken into consideration at the time of installing transformers.
- 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.
Carbon tetra-chloride and foam type fire extinguishers and buckets filled with sand should be kept, ready for this purpose.
The transformer must be mounted on a non reflecting resistance pad and non vibrating surface to reduce the noise label considerably.
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.