This method statement explains and covers the transformer installation & inspection procedure of cast resin Transformers, although it is applicable for any other type as well.
Transformer is used to transform the high voltage powers to low voltages, so that it is useful for domestic purpose. There are many types of transformers like oil type, dry type etc.
On arrival at project site, transformer shall be inspected and checked against the relevant general arrangement drawing, approved material submittals etc.
Transformer will be off loaded to the place nearest to the future installation and protected properly from dust and adverse environmental impacts.
The transformer shall be stored in sheltered, clean and dry ambient temperature.
Transformer shall be checked for any signs of damage occurred probably during the transport. If any damage is found shall be notified to suppliers or relevant parties.
The characteristics of the Transformer detailed on the rating plate shall be checked to those of the shipping documents and with those of the test report, which is attached to the transformer.
Each transformer shall be checked for the accessories, rating, name plate details, protection devices, indicators & terminal boxes.
Compliance of comments raised during factory inspection shall be checked if any.
The Presence of all identifying and warning levels shall be checked.
All material required at site shall be inspected, handled and store properly.
Any discrepancies, damage etc., shall be notified and reported for corrective action.
Material found not suitable as per approved material submittal shall be removed from site.
Proper storage shall be provided as per manufacturer recommendation.
An inspection request shall be raised for consultant approval upon receipt of the material at site.
Transformer Pre-Installation Requirements
Arrange following tools and equipment:
- Measuring tape and setting out markers
- Electric drill hammer
- Tool box
- Fork lift/Crane
- PPE for all staff and labor
The supervisor and foreman will orient and familiarize all the technicians and labors involve in the installations regarding relevant approved shop drawings, technical submittals, installation procedures and details, acceptance criteria and safety requirements.
Ensure all civil works are completed, unit base must be properly cured and its foundations must be strong enough to withstand the unit weight, including floor paint and clearance is obtained from respective authorities to proceed further.
Method for Transformer Installation
The area or transformer room to be verified to ensure that the civil work has been completed and transformers placement/installation work can commence.
Also check that the area is clean for the positioning of lifting crane and transformers.
Extra precaution to be taken before lifting transformer & manufacturers’ recommended special lifting eyes shall be used.
Transformer shall be lifted with maximum sling angle of 60 degree as per manufacturer’s recommendation.
If the transformer is complete with protection enclosure, roof shall be taken off to attach the slings.
Points of attachment shall be checked for cracked welds or loose nuts and bolts before lifting.
Guide ropes shall be used to prevent twisting or swinging of the transformer once it has been lifted clear of the ground.
Don’t perform lifting of transformer in high winds.
Transformer shall be placed down on the level surface capable of supporting its weight.
Place the transformer on removable GI U channel at the place of its final installation.
For locating the transformer in the final location, suitable lever on the special points foreseen on the lower frames shall be used to act only and not on the magnetic core and/ or on the winding.
Make sure that during the movement of transformer no one is pushing the coils and the connections.
Secure the transformer to the foundation after assuring the correct positioning, by fixing bolts and blocking the transformer wheels.
Cable support, cabling and terminations shall be completed as per approved drawings and manufacturer’s recommendation.
Installation of current transformer shall be offered for inspection.
After the transformer installation and approval, substation is securely locked up and the room placed under the permit system and only those that have suitable permits may enter the room.
Now we can plan the next activity of transformer testing and commissioning.
Transformer Installation Checklist
Check Transformer are of correct size, type and capacity in accordance with schedules & specification
Make sure that the installation is as per approved shop drawings, manufacturer’s instruction and specification requirement
Check mounting, alignment and orientation are correct and sufficient space is available for maintenance purposes
Make sure that the transformer rail and pulley hook been installed properly
Inspect for physical, electrical and mechanical condition of the transformer. No damage evident.
Verify that all manufacturer control wiring between shipping splits is properly connected as per manufacturer’s drawings and specifications
Equipment identification labels permanently affixed
Verify transformer connections are correct as per the single line diagram
Inspect insulators, barriers and shields for damage or contamination
Inspect transformer cables and connections for defects or physical damage
Equipment identification labels permanently affixed