Transformer Capacity Landing Page
1250kVA Dry Type Transformer
Specify a 1250kVA dry type transformer for indoor power rooms, commercial buildings, industrial feeders and EPC distribution packages. This page summarizes the key electrical and procurement data needed before quotation.
Rated Capacity
1250kVA
Transformer Type
Cast-resin dry type distribution transformer
Typical Voltage
10kV primary with 0.4kV secondary; 11kV, 22kV or 33kV by project design
Cooling
AN standard, AF optional by project requirement
Product Overview
Engineering Selection Context
A 1250kVA dry type transformer is commonly selected where fire safety, low routine maintenance and indoor installation are more important than the lowest initial price. It can be configured for distribution rooms, package substations, hospitals, data rooms, commercial towers and factory workshops.
This page sits inside ZY POWER's SCB13, SCB14 and SCB18 cast-resin dry type transformer family. The full dry type portfolio covers 30-3,150kVA; this landing page focuses on the 1250kVA selection point used in building and industrial distribution schedules.
For procurement, the capacity alone is not enough. The RFQ should also state primary voltage, secondary voltage, frequency, vector group, impedance, enclosure rating, temperature controller requirement, fan option and site altitude.
Ziyao Power supplies project-specific dry type transformer proposals based on IEC and local tender requirements, with drawings, datasheets and test documents prepared for engineering approval.
Technical Specifications
Key Data Required Before Quotation
These values should be confirmed against the single-line diagram, tender document and site conditions.
| Rated Capacity | 1250kVA |
|---|---|
| Product Family | SCB13, SCB14 or SCB18 cast-resin dry type transformer |
| Rated Voltage | 10/0.4kV standard reference; 11/0.4kV, 22/0.4kV or 33/0.4kV by project-defined ratio |
| Frequency | 50Hz or 60Hz |
| Phase | Three phase |
| Vector Group | Dyn11 or specified by project design |
| Cooling Method | AN, with AF fan cooling optional |
| Insulation Class | Class F or Class H insulation system |
| Efficiency Option | SCB13 Class 3, SCB14 Class 2, SCB18 Class 1 under GB 20052-2020 where specified |
| Protection Level | IP00 for indoor cabinet integration, IP20/IP23/IP31 enclosure optional |
| Installation Type | Indoor floor-mounted transformer room, package substation or switchgear room |
| Standard | IEC 60076 series, IEC 60076-11, GB/T 10228, GB 20052-2020 or tender-specified standard |
Construction & Materials
Build Details Buyers Should Confirm
Material decisions influence loss level, thermal behavior, footprint, maintenance and approval documents.
High-grade silicon steel core with low-loss magnetic design for distribution service; amorphous alloy wording is reserved for SH15/SBH15/SCBH15 series, not SCB dry type pages.
Epoxy cast-resin HV windings for moisture resistance, mechanical strength and fire-safe indoor operation.
Copper or aluminum windings selected according to tender budget, loss requirement and project preference.
Temperature monitoring terminals, PT100 sensor option and fan control interface for transformer room supervision.
Sheet steel protective enclosure optional when the transformer is installed in public, dusty or high-touch areas.
Applications
Where This Page Fits
Commercial building main distribution rooms and shopping centers.
Hospitals, schools, data rooms and other indoor low-fire-risk projects.
Factory workshops, process lines and industrial power distribution feeders.
PV, battery storage and microgrid auxiliary distribution systems.
Package substation and switchgear room integration where oil equipment is not preferred.
Standards & Compliance
Documents for Engineering Review
IEC 60076 power transformer general requirements.
IEC 60076-11 dry type transformer requirements and tests.
Routine tests such as winding resistance, voltage ratio, vector group, insulation resistance and applied voltage test.
Project documents can include outline drawing, wiring diagram, test report, nameplate and packing list.
FAQ
Procurement Questions
What information is needed to quote a 1250kVA dry type transformer?
Please provide capacity 1250kVA, primary and secondary voltage, frequency, vector group, impedance, cooling method, enclosure IP rating, winding material preference and destination country.
Can a 1250kVA dry type transformer be used indoors?
Yes. Dry type transformers are commonly used indoors because they do not use mineral oil and can be installed in transformer rooms with suitable ventilation and clearance.
Should I choose copper or aluminum windings?
Copper is often preferred for compact design and lower resistance, while aluminum can be used when the project prioritizes cost. The final choice should match tender requirements and loss targets.
Should I choose SCB13, SCB14 or SCB18?
SCB13 is a cost-effective standard dry type option, SCB14 is the middle efficiency step, and SCB18 is the GB 20052-2020 Class-1 efficiency option. SCB18 is usually preferred for data centers, hospitals, green-building projects and owner-operated sites with long operating hours.
Is AN cooling enough for this capacity?
AN cooling is the standard natural-air option. AF fan cooling can be specified when the project requires temporary overload margin or improved heat removal.
What enclosure rating should be selected?
IP00 is suitable inside locked transformer rooms or cabinets. IP20, IP23 or IP31 enclosures are used when touch protection, dust protection or public-area safety is required.
Does the transformer need a temperature controller?
A temperature controller is recommended for dry type transformers so alarm, trip and fan control signals can be integrated with the building or plant electrical system.
Can the voltage ratio be customized?
Yes. Common ratios include 10/0.4kV, 11/0.4kV, 22/0.4kV and 33/0.4kV, but the final ratio should follow the utility connection and low-voltage distribution design.
What documents are supplied after order confirmation?
Typical documents include outline drawing, technical datasheet, test report, nameplate, packing list and operation notes required for engineering approval.
How should I compare two transformer quotations?
Compare voltage ratio, energy-efficiency class, no-load and load loss, winding material, insulation class, cooling method, enclosure, accessories, test scope, drawings, delivery terms and warranty, not only the unit price.
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.
Related Products
Continue Product Selection
SCB13 Dry Type Transformer
Cast-resin distribution transformer for indoor power rooms and commercial buildings.
View productSCB14 Dry Type Transformer
Higher-efficiency dry type transformer option for long operating hours.
View productPower Transformers
Dry type, oil immersed and amorphous alloy transformer systems.
View product