Transformer Voltage Landing Page
11kV Transformer
Select a 11kV transformer for urban distribution, commercial feeders, small industrial plants and package substations. This page helps EPC teams and buyers define the technical inputs required for a reliable transformer quotation.
Primary Voltage
11kV
Transformer Types
Dry type, oil immersed or package substation transformer
Secondary Voltage
0.4kV, 0.69kV, 6.3kV, 10kV or project-defined output
Frequency
50Hz or 60Hz
Product Overview
Engineering Selection Context
11kV transformers are used to adapt medium-voltage utility or plant distribution networks to the required low-voltage or secondary medium-voltage level.
ZY POWER transformer pages are aligned to the documented power transformer portfolio: S11/S13/S20/S22 oil-immersed transformers and SCB13/SCB14/SCB18 cast-resin dry type transformers for 30-3,150kVA distribution applications.
The correct selection depends on load capacity, installation environment, fire-risk policy, cooling method, impedance, vector group, short-circuit condition and local grid requirements.
Ziyao Power can prepare dry type, oil immersed or prefabricated substation transformer proposals when the buyer provides the single-line diagram or transformer schedule.
Technical Specifications
Key Data Required Before Quotation
These values should be confirmed against the single-line diagram, tender document and site conditions.
| Rated Voltage | 11kV primary, secondary voltage by project design |
|---|---|
| Rated Capacity | 30kVA to 3150kVA documented distribution range; larger ratings by project review |
| Frequency | 50Hz or 60Hz |
| Transformer Type | Dry type for indoor use, oil immersed for outdoor or utility service |
| Vector Group | Dyn11, Yyn0 or specified by grid design |
| Cooling | AN/AF for dry type, ONAN for oil immersed type |
| Core Material Note | S13/S20/S22 pages use silicon steel / low-loss oil immersed wording; amorphous alloy wording is kept for SH15/SBH15/SCBH15 series only |
| Protection Level | IP enclosure for dry type, outdoor tank or kiosk enclosure for oil type |
| Installation Type | Indoor room, outdoor pad, package substation or utility bay |
| Standard | IEC 60076 series, IEC 60076-11 for dry type, IEC 60076-2 for temperature rise, GB 1094 / GB 20052 where specified |
Construction & Materials
Build Details Buyers Should Confirm
Material decisions influence loss level, thermal behavior, footprint, maintenance and approval documents.
Silicon steel core design selected for the specified loss level and service duty.
Dry type cast-resin or oil immersed winding structure selected according to installation environment.
Tap changer, terminals, rollers, lifting points and grounding terminals configured to project drawings.
Optional enclosure, temperature monitor, protection relay interface and cable box by installation layout.
Applications
Where This Page Fits
urban distribution, commercial feeders, small industrial plants and package substations
Utility distribution substations and industrial plant incoming feeders.
Commercial buildings, renewable projects and infrastructure power supply systems.
Package substations requiring transformer, MV switchgear and LV switchgear coordination.
Standards & Compliance
Documents for Engineering Review
IEC 60076 power transformer standard series.
Routine factory testing before shipment.
Project-specific drawing, datasheet and test certificate package.
Local grid or tender standard can be reviewed during quotation.
FAQ
Procurement Questions
What secondary voltage can be supplied for a 11kV transformer?
Common secondary voltages include 0.4kV, 0.69kV, 6.3kV and 10kV, but the final value should follow the load system and grid connection design.
Should a 11kV transformer be dry type or oil immersed?
Dry type is usually selected for indoor fire-safe installations. Oil immersed transformers are often preferred for outdoor utility, solar farm or higher-capacity distribution projects.
What capacity should be selected?
Capacity should be based on connected load, demand factor, future expansion, ambient temperature and allowable loading policy. A load schedule is better than selecting only by transformer name.
Which vector group is most common?
Dyn11 is common in many distribution projects, while other vector groups may be required by local grid rules or parallel operation conditions.
Can Ziyao Power supply transformer with switchgear?
Yes. Transformer, MV switchgear, LV switchgear and prefabricated substation packages can be coordinated for EPC projects.
What should be included in the RFQ?
Include voltage ratio, capacity, frequency, phase, vector group, impedance, installation environment, enclosure requirement, accessories, standards and destination country.
Are 50Hz and 60Hz designs both available?
Yes. The frequency must be confirmed at RFQ stage because it affects magnetic design, losses and temperature rise.
What documents are provided for engineering approval?
Typical documents include technical datasheet, outline drawing, wiring diagram, test report, nameplate and packing list.
RFQ CTA
Send your specification for engineering review
Attach a transformer schedule, single-line diagram, switchgear drawing or load list. Our team will match the product configuration to voltage, capacity, installation and approval requirements.
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