Products
HKXR POWER

Commercial buildings • Industrial plants • Data centers and critical infrastructure • Indoor substations

Dry-Type Transformers

Dry-Type Transformers for Kosovo, with primary-voltage options of 10 / 20 / 35 kV and secondary configurations of 0.4 kV for distribution, industrial and electrical-infrastructure applications.

Rated capacity≤11 kV: 30–2500 kVA; >11–38.5 kV: 50–2500 kVA
Primary voltage10 / 20 / 35 kV
PhasesThree-phase
ApplicationsCommercial buildings / Industrial plants

Rated capacity: ≤11 kV: 30–2500 kVA; >11–38.5 kV: 50–2500 kVA · Primary voltage: 10 / 20 / 35 kV · Secondary voltage: 0.4 kV

Dry-Type Transformers

01 Technical data

Specifications for initial selection

Rated capacity: ≤11 kV: 30–2500 kVA; >11–38.5 kV: 50–2500 kVA · Primary voltage: 10 / 20 / 35 kV · Secondary voltage: 0.4 kV

Rated capacity
≤11 kV: 30 / 50 / 80 / 100 / 125 / 160 / 200 / 250 / 315 / 400 / 500 / 630 / 800 / 1000 / 1250 / 1600 / 2000 / 2500 kVA; >11–38.5 kV: 50 / 100 / 160 / 200 / 250 / 315 / 400 / 500 / 630 / 800 / 1000 / 1250 / 1600 / 2000 / 2500 kVA
Primary voltage
10 / 20 / 35 kV
Secondary voltage
0.4 kV
Phases
Three-phase
Winding conductor
Copper / Aluminum
Insulation system
Cast resin · Class F / H
Cooling & ventilation
AN / AF
Enclosure & protection
Open type / metal enclosure

02 Application engineering

Applications

Dry-type and cast resin transformers for indoor substations in Kosovo, where oil-free construction, fire safety and compact electrical rooms matter (10 / 20 / 35 kV); typical duties range from projects in industrial parks, renewable energy and mining to critical facilities and industrial plants.

01

Mining and process facilities

Distribution at mine sites, concentrators and process plants, including indoor e-houses and underground or enclosed substations. Oil-free design removes oil-spill and fire concerns in confined spaces; dust, humidity and altitude conditions are addressed through enclosure and insulation engineering.

02

Industrial plants and process areas

Distribution inside factories and production halls (industrial parks, renewable energy and mining), feeding motors, drives and control centers from indoor MV switchrooms. Cast resin coils tolerate frequent load changes and dusty or humid rooms when the enclosure and cooling are matched to the environment.

03

Commercial buildings and hospitals

Indoor substations in offices, shopping centers, hospitals and public buildings, where oil-free insulation reduces fire-load and containment concerns inside the building. Cast resin units sit close to the load centre, shortening LV runs, and are sized with ventilation and enclosure requirements in mind.

Where to apply

  • Indoor substations
  • Commercial buildings
  • Renewable energy facilities
  • Hospitals and public buildings
  • Industrial plants
  • Metro and transport facilities

03 Define your configuration

Configure your transformer

Select the main project parameters.

Rated capacity

Primary voltage

Secondary voltage

Phases

Additional options

Winding conductor

Insulation system

Cooling & ventilation

Enclosure & protection

04 Construction and options

Technical resources and options

Typical configuration

Cast resin insulation: high-voltage windings encapsulated in epoxy resin for oil-free operation in indoor substations, with insulation class F or H according to the design. Winding conductor and core: copper or aluminium windings and a low-loss silicon-steel core, selected for load profile, loss specification and IEC/EN and the KOSTT / KEDS / project technical specification.

Typical configuration

Natural air (AN) cooling is the base arrangement; the electrical room must provide ventilation sized for the transformer losses and the ambient temperature.

Available option

Forced-air (AF) cooling with fans can be specified to increase short-term loading capability or offset high ambient temperature; the rating effect is confirmed in the project datasheet.

Available option

Winding temperature monitoring: PT100 sensors in the low-voltage windings with a temperature relay for alarm and trip functions, wired to the customer control system.

Available option

Enclosure and protection: open-type construction or a metal enclosure with an IP degree selected for the room, dust, access and safety requirements.

Project engineering

Environmental engineering for wide seasonal temperature swings, frost and snow or ice loading: enhanced humidity and dust protection, altitude derating, special enclosure coatings and fiber-optic or other special monitoring are confirmed at project level.

05 Applicable standards and requirements

Standards & engineering

KOSTT Electrical Equipment Code
KOSTT Electrical Equipment Code; Electrical Standards Code; IEC/EN requirements; IEC 60076-11
KOSTT / KEDS / ERO(ZRRE)
KOSTT Electrical Equipment Code; Electrical Standards Code; IEC/EN requirements; IEC 60076-11
Primary voltage
10 / 20 / 35 kV
Secondary voltage
0.4 kV
Request compliance and engineering documents

06 Manufacturing process

From production to testing

Production — Dry-Type Transformers
01Production
Assembly — Dry-Type Transformers
02Assembly
Testing — Dry-Type Transformers
03Testing

Downloads & support

Technical documents

HKXR POWER Technical Selection Guide

Guide for initial technical selection of distribution, power, dry-type, pole-mounted and pad-mounted transformers.

Unlock download

Complete your details to download the HKXR POWER Technical Selection Guide.

07 Decision support

Frequently asked questions

When should Dry-Type Transformers be selected instead of Oil-Immersed Transformers?

For Kosovo, choose Dry-Type Transformers when the main duties are Indoor substations and Commercial buildings; compare Oil-Immersed Transformers when Utility distribution networks and Distribution substations better match the site. Final selection depends on the installation environment, network topology, fire or oil-containment requirements, rating and project specification.

How should the main configuration options for Dry-Type Transformers be selected?

Key choices include AN/AF cooling, temperature monitoring and enclosure and protection. Select them according to the load profile, connection arrangement, installation environment, protection philosophy and utility/EPC specification; items shown as options or project engineering are not automatic standard equipment.

What installation conditions should be confirmed for Dry-Type Transformers projects in Kosovo?

Confirm ambient temperature, altitude, humidity, dust or corrosion exposure, indoor/outdoor location, ventilation, access and maintenance clearances. For applications such as Indoor substations, Commercial buildings and Renewable energy facilities, cooling, enclosure or insulation and protection should be reviewed during engineering rather than assuming one environmental class for the whole country.

Which standards and utility/project requirements should be confirmed in Kosovo?

Use KOSTT Electrical Equipment Code as the starting technical reference. Requirements from KOSTT / KEDS / ERO(ZRRE) should also be confirmed. Final losses, temperature rise, impedance, taps, accessories, tests and documentation must be checked against the applicable project specification; this page does not imply automatic approval by any authority.

What tests, drawings and documents should be agreed before the purchase order?

Confirm the applicable routine tests, general arrangement drawings, electrical datasheet, accessory list and inspection/test documents before manufacturing. Type or special tests, witnessing and additional reports should be specified when the project requires them. For Dry-Type Transformers, also confirm site-specific environmental and installation engineering.

What information does HKXR need to prepare a technical quotation?

Provide at least Rated capacity, Primary voltage, Secondary voltage, Phases, the selected AN/AF cooling / temperature monitoring options, installation conditions and the applicable project or utility specification. If available, attach the SLD, datasheet or tender specification so the configuration can be reviewed before quotation.

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