The transformer substation is the node where power conversion between grid and facility takes place, and the facility's energy continuity depends directly on getting its design right. Selecting the wrong transformer rating, an incomplete protection coordination scheme, or a layout that breaches the standards leads to nuisance tripping in operation and to non-conformities in the acceptance process.
Miratek treats transformer substation design as an integrated whole, from the single-line diagram to protection coordination. Transformer type and rating are selected to the load profile; the cubicle arrangement, building or kiosk layout, grounding, and ventilation design are engineered under the Electrical High Current Installations Regulation and the relevant IEC standards. The relay coordination study is prepared with selectivity in mind on both the grid side and within the facility.
The entire approval process is run by Miratek, and the design is delivered with installation details the execution team can use directly.
Technical Scope Summary
| Substation Types | Building-type, concrete kiosk, monobloc, and pole-mounted transformer substations |
| Transformer Types | Dry-type and oil-immersed distribution transformers |
| Voltage Level | MV/LV conversion, input up to the 36 kV level |
| Deliverables | Single-line diagram, layout plan, grounding design, protection coordination report |
| Calculation Scope | Transformer rating selection, short circuit, grounding, ventilation |
| Compliance Framework | Electrical High Current Installations Regulation, distribution company specifications, relevant IEC standards |
How We Work
Load Profile and Rating Selection
The facility's load characteristics are analyzed; transformer rating, type, and quantity are selected with growth margin in mind.
Layout and Single-Line Design
The substation type is determined; the cubicle arrangement, transformer and LV main distribution layout, and the single-line diagram are prepared.
Protection Coordination
Relay settings and fuse and breaker selections are calculated on a selectivity basis, and a coordination report is issued.
Grounding and Detail Design
The grounding grid, ventilation, cable ducts, and installation details are drawn to execution level.
Approval and Delivery
The design file is submitted to the relevant authority, revisions are handled, and the approved design is delivered ready for execution.
Scope of Work
- Transformer substation single-line diagrams and layout designs
- Transformer rating selection and load analysis
- Relay coordination and protection setting calculations
- Grounding system design
- Detail designs for building-type and kiosk-type substations
- Management of distribution company approval processes
Frequently Asked Questions
Should we choose a dry-type or an oil-immersed transformer?
The choice depends on installation location, fire risk, maintenance facilities, and investment budget. Dry-type units come to the fore indoors and in densely occupied areas, while oil-immersed units are common in open-field and kiosk applications; Miratek reports both scenarios comparatively.
Why is protection coordination studied separately?
The coordination study ensures that during a fault only the faulty zone is disconnected while the rest of the facility keeps running. Protection devices selected without this study can cause nuisance tripping or allow a fault to escalate.
Our existing transformer is no longer sufficient — what should we do?
First, the real requirement is established through load measurement and analysis. Based on the outcome, transformer uprating, an additional transformer, or load balancing options are designed, and the necessary authority approvals are obtained to make them ready for execution.
