The transformer substation is the heart of your facility: it steps the energy received from the grid down to a usable voltage level and feeds the entire operation. Our transformer substation service covers the full scope — design of dry-type and oil-immersed transformers, construction of building-type or kiosk-type substations, MV switchgear cubicle installation, and commissioning. Beyond new installations, capacity upgrades, transformer replacement, and modernization of existing substations are also part of this service.
Miratek delivers transformer substation works turnkey on a single-point-of-contact principle. The process starts with correctly determining the power requirement and is followed through by the same engineering team — distribution company approvals, equipment procurement, site installation, and supervised energization. Panel and cubicle selections favour type-tested equipment compliant with the relevant standards such as IEC 61439.
After commissioning, operation-phase services such as periodic maintenance, thermal inspection, and oil analysis support the long service life and safe operation of the substation.
Transformer Substation Technical Summary
| Voltage level | MV input 1-35 kV, LV output 0.4 kV |
| Transformer types | Dry-type (cast resin) and oil-immersed distribution transformers |
| Substation type | Building-type, concrete kiosk, compact (monobloc) substations |
| MV equipment | Modular and metal-enclosed cubicles, protection relays |
| Compliance | IEC 61439-compliant panel systems, type-tested equipment |
| Delivery model | Turnkey; approvals, installation, and acceptance included |
| Test scope | Oil and insulation tests, relay coordination, grounding measurement |
How We Work
Power Analysis and Site Survey
The facility's demand power is calculated, and site conditions are assessed to select the transformer rating and substation type.
Design and Approval
MV-LV designs are prepared, and approvals are obtained from the distribution company and relevant authorities.
Equipment Procurement
Transformer, MV cubicles, LV panel, and protection equipment are procured from type-tested manufacturers.
Site Installation
The substation building or kiosk placement is completed; transformer, cubicle, and panel installations are carried out.
Testing and Commissioning
Insulation, grounding, and relay tests are completed, and energization is performed under distribution company supervision.
Operation and Maintenance Support
Periodic maintenance, thermal inspection, and reporting support the safe operation of the substation.
Scope of Work
- Supply and installation of dry-type and oil-immersed transformers
- MV cubicle (incomer, feeder, metering, protection) installation and busbar connections
- LV main distribution panel installation and transformer-to-panel connections
- Preparation of the concrete kiosk or building-type substation structure
- Grounding installation and measurements
- Protection relay settings and selectivity coordination
- Distribution company acceptance procedures and commissioning
Frequently Asked Questions
Should we choose a dry-type or an oil-immersed transformer?
Dry-type transformers are preferred indoors and in densely occupied areas for fire safety, while oil-immersed transformers are a common and economical solution in open-field and kiosk applications. The choice is made through an engineering assessment based on installation location, power requirement, and operating conditions.
How long does a transformer substation installation take?
The duration varies with substation type, power level, and approval processes. After the site survey, a clear work schedule covering design approval, equipment procurement, and installation is shared, and the process is run transparently against this timeline.
Our existing transformer is no longer sufficient — how is a replacement handled?
First, the actual requirement is verified with load measurements; then a design revision and distribution company approval are obtained for the new transformer rating. The replacement is planned to minimize the facility's power outage and is completed with supervised commissioning.
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