Winding Shop
HV and LV coils are wound in-house on our own machines. Winding quality is what sets load loss and short-circuit withstand, so it is not a process we sub-contract.
- Max Unit Wound
- Up to 25 MVA
The works · GIDC Sachin
The floor that holds the licence
A BIS licence is granted against an audited process, not a purchase order. These are the shops that process runs through — and the reason core, winding, tanking and testing are not sub-contracted.
- 38+
- Years in Business
Manufacturing
Four shops, one building
Each of these covers a step the BIS licence audits. Keeping them together is what makes the certification defensible and the repair path short.
Core Cutting & Stacking
Core laminations are cut and stacked to the design. Core geometry decides the no-load loss the transformer will carry every hour of its life.
Tank Fabrication
Tanks, radiators and conservators are fabricated, welded, leak-tested and painted on site, then matched to the core and coil assembly they were designed around.
Assembly & Tanking
Core and coil assemblies are clamped, braced, tanked and filled with treated insulating oil, with the crane capacity to handle units through the full rating range.
- Crane Capacity
- 30 Ton SWL
Testing
Nothing ships untested
Routine tests are what turn a specification into a verifiable claim. The certificate that ships with a unit is also the baseline every later maintenance reading gets compared against.
- Turns RatioConfirms the winding ratio matches the design on every tap position.
- in-house
- Winding ResistanceDetects bad joints, broken strands and incorrect connections before dispatch.
- in-house
- Insulation ResistanceVerifies the insulation system between windings and to earth.
- in-house
- No-Load Loss & CurrentMeasures the core loss the unit will draw continuously for its whole life.
- in-house
- Load Loss & ImpedanceMeasures copper loss and the impedance that fixes fault level and parallel operation.
- in-house
- Applied VoltageProves the insulation between each winding and earth by applying a raised voltage for one minute.
- in-house
- Induced Over VoltageStresses the insulation BETWEEN turns of the same winding, which the applied-voltage test cannot reach.
- in-house
- Dielectric Strength (BDV)Tests the insulating oil, before and after filtration.
- Impulse WithstandType test simulating a lightning strike on the winding insulation.
- Temperature RiseType test confirming the unit stays within its insulation class under full load.
Quality control
Caught before it is buried in a tank
Checks happen at hold points through the build, not only at the end. Once a core and coil assembly is tanked and filled, finding a fault costs a great deal more than preventing one.
Incoming Material
Core laminations, conductor and insulating materials are checked against specification before they enter the shop.
In-Process Checks
Winding, stacking and assembly are checked at defined hold points rather than only at the end, so a fault is caught before it is buried inside a tank.
Routine Testing
Every unit goes through the full routine test set before dispatch. No unit ships on a partial result.
Documentation
Test certificates are issued with each transformer, giving the buyer the commissioning baseline that all later maintenance readings get compared against.
Tula Trans Electricals
Rating & Certification Plate
- Standard
- IS : 1180
- CML No.
- 7200106894
- Certification
- ISO 9001:2015
- Voltage Class
- 11 – 66 kV
- Established
- 1988
- Experience
- 38 Years
- Quality Policy
- Manufactured · Repaired · Tested — In-house
- Location
- GIDC Sachin, Surat, Gujarat
- Facility Area
- 11,500 sq m
- Manufacturing Capacity
- 100,000 kVA per year
- Repair Capacity
- 250 – 300 units per year
- Quality System
- ISO 9001:2015
- BIS Licence
- IS : 1180 — CML 7200106894
Enquiries
Come and walk the floor
We are at Near Paliwal Square, GIDC, Sachin, Surat. For a first order, an hour on a supplier's shop floor tells you more than any brochure.