Home Products Dry Type Transformer 1250 kVA Cast Resin Dry-Type Transformer – SCB14, 35kV/10kV, EU Compliant

1250 kVA Cast Resin Dry-Type Transformer – SCB14, 35kV/10kV, EU Compliant

Zhongxin General is a China-based manufacturer, factory and supplier of 1250 kVA three-phase cast resin dry-type transformers — stepping 35 kV/10 kV down to 400 V with Dyn11 vector group and ANAF cooling. Compliant with GB 20052-2024 (Grade 1 and Grade 2), GB/T 10228-2023 and IEC 60076-11, and meeting EU Commission Regulation No. 548/2014 and 2019/1783 (amended) Tier 1 and Tier 2 energy efficiency requirements. Available in copper or aluminium winding, at 50 Hz or 60 Hz, for domestic and international distribution and industrial projects.

Technical Specifications

Parameter	Value
Rated Capacity	1250 kVA
Phases	3-Phase
Frequency	50 Hz / 60 Hz
High Voltage	10 kV (customizable)
Low Voltage	400 V (customizable)
Vector Group	Dyn11
Insulation Class	Class H (175 °C)
Temperature Rise Limit	125 K
Cooling Method	ANAF (Air Natural + Air Forced)
Installation	Indoor
Energy Efficiency	GB 20052-2024 Grade 1 / Grade 2 · EU No. 548/2014 & 2019/1783 Tier 1 / Tier 2
Applicable Standards	GB/T 10228-2023 · GB 1094.1.2-2013 · GB 1094.3-2017 · GB 20052-2024 · IEC 60076-11
Winding Material	Copper (standard) / Aluminium (available on request)
Protection Degree	IP00 / IP20 / IP30 (enclosure options)

SCB14-1250/10 dry-type transformer nameplate — 1250 kVA 10kV/400V Dyn11 ANAF 5.87% impedance GB 20052-2024 Grade 2 Zhongxin General — Factory nameplate of the SCB14-1250/10 cast resin dry-type transformer — 1250 kVA, 10.5kV/400V, Dyn11, ANAF, short-circuit impedance 5.87%, total weight 2,630 kg. Ex-factory No. B260187, manufactured April 2026. Compliant with GB 1094.1.2-2013, GB/T 10228-2023, GB 20052-2024, GB 1094.3-2017.

Real Delivery Case — SCB14-1250/10, 1250 kVA

The following nameplate data and images are from an actual delivered unit — SCB14-1250/10, Ex-factory No. B260187, manufactured and dispatched from Zhongxin General’s Sichuan facility in April 2026. Every parameter shown on the nameplate is verified through routine factory acceptance testing before dispatch.

SCB14-1250/10 Nameplate Data — Actual Delivered Unit

Parameter	Value
Model	SCB14-1250/10
Product Code	2319
Rated Capacity	1250 kVA
Phases	3-Phase
Rated Frequency	50 Hz
High Voltage (5 Taps)	10,500 V / 10,250 V / 10,000 V / 9,750 V / 9,500 V
Rated HV Current	72.2 A
Low Voltage	400 V
Rated LV Current	1,804 A
Vector Group	Dyn11
Insulation Level	LI 75 AC 35 / LI AC 3
Thermal Class	Class H
Temperature Rise Limit	125 K
Cooling Method	ANAF
Service Conditions	Indoor
Short-Circuit Impedance	5.87%
Protection Degree	IP00
Total Weight	2,630 kg
Ex-factory No.	B260187
Manufactured	April 2026
Applicable Standards	GB 1094.1.2-2013 · GB/T 10228-2023 · GB 20052-2024 · GB 1094.3-2017

Manufacturing Process — From Winding to Dispatch

The quality of a cast resin dry-type transformer is determined in the manufacturing process. The following images document the actual production steps at Zhongxin General’s Sichuan facility.

Low-Voltage Foil Winding

The low-voltage winding adopts a foil winding structure, solving the axial helical angle problem during wire winding and achieving better ampere-turn balance. High-quality copper foil is wound by automatic foil winding machine. The LV output copper busbars are connected to the foil winding using argon-protected welding, ensuring high welding quality and minimal contact resistance — critical for reliable delivery of the 1,804 A rated LV current. DMD epoxy resin pre-impregnated cloth is used between winding layers.

Epoxy Vacuum Casting & Curing

Multiple 1250 kVA dry-type transformer HV and LV windings after epoxy casting entering curing oven — Zhongxin General factory — Several sets of HV and LV windings, freshly vacuum-cast with epoxy resin, are loaded into the hot-air curing oven for integral cure forming. The vacuum casting process eliminates partial discharge and ensures uniform dielectric strength throughout the winding.

Completed cured LV winding coil of 1250 kVA dry-type transformer awaiting demoulding — Zhongxin General manufacturing — The low-voltage foil winding coil has completed the curing cycle and is ready for demoulding. The DMD epoxy resin pre-impregnated interlayer insulation and integral oven-cure process ensure dimensional stability and outstanding dielectric performance.

The high-voltage winding is vacuum-cast with filled epoxy resin — a process that greatly reduces partial discharge and improves coil electrical strength. Glass fiber mesh plates reinforce the inner and outer walls of the HV winding, enhancing mechanical strength and short-circuit withstand capability. The coils never crack under normal service conditions. After casting, all coils are cured in a controlled hot-air oven for integral forming.

HV Winding Demoulding

High-voltage epoxy cast winding of 1250 kVA dry-type transformer during demoulding — Zhongxin General production — Demoulding of the high-voltage epoxy cast winding coil. The HV winding is vacuum-cast with filled epoxy resin; glass fiber mesh plates reinforce inner and outer walls, providing superior short-circuit withstand capability. The coils never crack under normal operating conditions.

Following completion of the curing cycle, the HV epoxy cast winding is demoulded. The finished coil surface shows the clean, void-free resin encapsulation that gives SCB-series transformers their flame-retardant, fire-proof, explosion-proof, maintenance-free, pollution-free characteristics.

Final Assembly

Final assembly integrates the iron core and HV/LV coil assemblies, installs structural clamping components, fits the temperature control system and cooling fans, and makes all busbar and terminal connections. This stage is performed by experienced senior technicians. The iron core uses imported high-quality cold-rolled silicon steel sheets with a five-stage full-oblique joint structure, bound with F-class non-woven tape and surface-coated with epoxy resin to reduce no-load loss, no-load current, and core noise.

Key Features — 1250 kVA Cast Resin Dry-Type Transformer

Excellent insulation performance, reliable and stable operation. The epoxy vacuum-cast HV winding, combined with glass fiber reinforcement, delivers superior dielectric strength and partial discharge performance. The coils never crack.

Low no-load loss and remarkable energy saving effects. The iron core uses high-permeability, high-quality cold-rolled grain-oriented silicon steel sheets, significantly reducing no-load loss and no-load current. The surface coating provides moisture and rust protection while reducing noise. Grade 1 efficiency versions (GB 20052-2024) exceed the requirements of EU Commission Regulation No. 548/2014 and its 2019/1783 amendment.

Low partial discharge and long service life. Vacuum casting with filled epoxy resin virtually eliminates partial discharge, extending the transformer’s operating life to 30 years or more under normal service conditions.

Strong resistance to sudden short circuits and grid impacts. Five-stage full-oblique core joint structure and fiberglass-reinforced epoxy winding encapsulation provide exceptional short-circuit withstand capability.

Intelligent temperature monitoring and ANAF cooling. PT100 sensors embedded in the LV coil, intelligent temperature controller, and cross-flow top-blowing cooling fans ensure safe, efficient operation and automatic thermal protection.

Temperature Control System

Temperature detection is performed through PT100 platinum resistance sensors embedded in the low-voltage coil during manufacturing. The sensors feed into an intelligent temperature controller that provides:

Sequential detection and display of three-phase winding temperatures with fault self-diagnosis
Hot-spot phase winding temperature value display
Over-temperature alarm output (adjustable setpoint)
Over-temperature trip output (adjustable setpoint)
Black box function: automatic or timed fan start/stop

Optional functions: Analog current output/communication interface / additional iron core or ambient temperature detection point / additional pair of active output contacts / RS485 serial interface for centralized monitoring and computer integration.

Cooling fans are cross-flow top-blowing type, featuring low noise, high wind pressure, and compact aesthetics. Under ANAF forced-air cooling conditions, the transformer can operate continuously at 150% rated load for short periods.

EU Export Compliance — Phase Marking & CE Declaration

EU-compliant high-temperature phase sequence markings on 1250 kVA dry-type transformer for European export — laser stencil paint Zhongxin General — Phase sequence and grounding identifier detail on a 1250 kVA dry-type transformer destined for European export. Permanent high-temperature resistant paint applied via laser-cut stencils replaces sharp metal plates, complying with EU safety requirements. Rated for operating temperatures exceeding 140 °C.

For dry-type transformers destined for European markets, Zhongxin General applies high-temperature resistant phase sequence and grounding markings using a custom laser-cut stencil and specialized paint rated for continuous service at temperatures exceeding 140 °C. This replaces conventional sharp metal identification plates and fully meets EU equipment safety requirements under the Low Voltage Directive (LVD) 2014/35/EU.

All 1250 kVA dry-type transformers for EU export are supplied with a CE Declaration of Conformity documenting compliance with:

Low Voltage Directive 2014/35/EU
EU Commission Regulation No. 548/2014 (energy efficiency — Tier 1 and Tier 2)
Commission Regulation (EU) 2019/1783 of 1 October 2019 (amendment to 548/2014)
IEC 60076-11: Power transformers — Dry-type transformers

Zhongxin General’s Grade 1 efficiency products (GB 20052-2024) meet and exceed EU Tier 1 requirements for medium power transformers as defined in Commission Regulation (EU) No. 548/2014. Third-party CE certification (TÜV or equivalent) is available on request at additional cost.

For a detailed account of how we navigated EU standards compliance — including ITP, FAT witness, CE Declaration of Conformity, and bolt torque documentation — on a real 1250 kVA dry-type transformer export project to Europe, see how we navigated EU standards compliance on a real 1250 kVA export project.

pplicable Standards & Testing

Every 1250 kVA dry-type transformer manufactured by Zhongxin General undergoes a full programme of routine tests before leaving the factory. No unit is dispatched without a complete test report.

Routine tests (every unit):

Winding resistance measurement
Voltage ratio and vector group verification
No-load loss and no-load current
Load loss and short-circuit impedance
Induced overvoltage withstand test
Separate-source AC withstand test
Partial discharge measurement

Type tests (conducted on representative units; reports available on request):

Temperature rise test
Lightning impulse test

Special tests (available on request):

Sound level (noise) measurement
Short-circuit withstand test

All tests are conducted in accordance with IEC 60076-11 and GB/T 10228-2023. Test reports and ITP (Inspection and Test Plan) documentation can be provided to customers prior to or alongside shipment. Factory Acceptance Test (FAT) with client witness is supported.

1250 kVA 10kV cast resin dry-type transformer undergoing factory acceptance test — routine and type tests Zhongxin General — A 1250 kVA SCB14 cast resin dry-type transformer under factory acceptance testing at Zhongxin General. Routine tests including winding resistance, voltage ratio, no-load loss, load loss, short-circuit impedance, and induced/separate-source withstand tests are all conducted before dispatch.

Available Options & Configurations

Winding material: copper (standard) or aluminium
Voltage class: 6 kV, 10 kV, 35 kV; HV customizable to match local grid standards
Low voltage: 380 V, 400 V, 415 V, 433 V, or other values to match local grid
Frequency: 50 Hz (standard) or 60 Hz
Energy efficiency grade: GB 20052-2024 Grade 1, Grade 2, or Grade 3
Tap changer: ±2×2.5% off-circuit (standard); on-load tap changer (OLTC) available
Protection degree: IP00 (open, standard) / IP20 / IP30 with metalwork enclosure
Enclosure material: cold-rolled steel plate or stainless steel
Temperature control: standard intelligent controller; RS485/Modbus communication optional
Cooling: ANAN (standard) or ANAF (with forced-air fan upgrade)
Noise reduction treatment available for noise-sensitive installations
High-altitude versions for installations above 1000 m a.s.l.
Tropical / high-humidity / coastal salt-spray versions available

Export Packaging & Logistics

Final quality inspection of 1250 kVA dry-type transformer before export packaging — Zhongxin General dispatch quality control — Final quality inspection before export packaging: bolt torque values verified with calibrated torque wrenches, electrical connections checked, phase sequence markings confirmed, documentation package reviewed, and protective coatings inspected. No unit leaves the factory without passing this comprehensive pre-dispatch check.

1250 kVA dry-type transformer secured on wooden base pallet awaiting export wooden crate enclosure — Zhongxin General — The 1250 kVA dry-type transformer unit is secured to its wooden base pallet ready for final wooden crate enclosure. For international export, the transformer body is packed in a reinforced wooden crate meeting ISPM 15 standards, with the cooling fans and accessories packed separately to prevent transit damage.

For international export, Zhongxin General uses a two-crate packaging solution developed through real export project experience:

Crate 1 — Transformer body: Reinforced wooden crate with internal shock absorption, desiccant packets, tilt indicators, and fragile handling labels. ISPM 15 compliant.
Crate 2 — Fans and accessories: Separate protective crate to prevent transit damage to cooling fan assemblies and loose accessories.
Complete documentation package (test reports, operation manual, CE Declaration of Conformity, packing list) in a waterproof sleeve.
Nitrogen-sealed tank and additional moisture protection available for long-distance sea freight.

Typical shipping dimensions (transformer body crate): approximately 2.4 m × 1.8 m × 2.1 m, total weight approximately 2,700 kg. Air freight and sea freight both supported.

Export-wooden-crated 1250 kVA dry-type transformer being loaded onto truck for air freight to Europe — Zhongxin General Sichuan — A wooden-crate packaged 1250 kVA cast resin dry-type transformer being crane-loaded onto the transport vehicle at Zhongxin General’s Sichuan factory, ready for air freight dispatch to Europe. The two-crate solution — transformer body plus fans and accessories separately — ensures zero damage in transit.

Batch Production Capability

Batch of over ten 1000–2000 kVA all-copper dry-type transformers fully loaded on trucks for domestic delivery — Zhongxin General Sichuan factory — *More than ten units of 1000–2000 kVA all-copper-winding dry-type transformers loaded and secured on trucks at Zhongxin General’s Sichuan factory, ready for dispatch to a domestic client.*

Zhongxin General’s Sichuan production lines support batch production of dry-type transformers across the complete 30 kVA to 8000 kVA capacity range, supporting 6 kV, 10 kV, and 35 kV voltage classes. The 1250 kVA capacity sits in our most active production range (1000–2000 kVA), with mature tooling, established quality protocols, and available capacity for volume orders.

For a recent example of batch dispatch, see our delivery of 22 units of KYN28-12 switchgear and 2 SCB18 dry-type transformers dispatched in a single shipment to a CATL supply chain project in Sichuan.

Typical Applications

The 1250 kVA cast resin dry-type transformer is widely used across a broad range of sectors. Its flame-retardant, oil-free, maintenance-free characteristics make it the preferred choice for indoor and urban installations where fire safety and environmental compliance are mandatory.

Commercial buildings — Shopping centres, high-rise office and residential towers, hotels, airports
Industrial parks & manufacturing — Chemical plants, new energy material production, precision manufacturing
New energy projects — Solar PV step-up stations, wind farm collection systems, prefabricated substations (see our recent Custom Large Prefabricated Modular Substation for Aktau Port, Kazakhstan)
Data centres & IT facilities — Critical power supply with zero-oil-spill risk
Rail transit systems — Traction substations, station power distribution
Healthcare facilities — Hospitals, clinics, where uninterrupted power is life-critical

For a large-scale healthcare power infrastructure reference, see our 16,730 kVA intelligent power system delivered for Xinjin District People’s Hospital, which included 12 dry-type transformers ranging from 500 kVA to 2000 kVA.

Inquire About 1250 kVA Dry-Type Transformer

Need a quotation, technical datasheet, or Factory Acceptance Test arrangement for a 1250 kVA cast resin dry-type transformer? Whether you are sourcing for a single installation, a batch order, or an international export project requiring IEC / EU compliance, Zhongxin General’s engineering team can provide specifications, pricing, compliance documentation, and delivery timelines matched to your requirements.

Tell us your grid voltage, required LV output, frequency, efficiency grade, voltage class, winding material preference, and any special environmental or installation conditions — and we will configure the right unit for your project.

[Contact Us for Price & Datasheet]

About Zhongxin General — Dry-Type Transformer Manufacturer & Factory

Zhongxin General (Sichuan Zhongxin General Electric Energy Co., Ltd.) is a China-based manufacturer and factory specialising in oil-immersed power transformer and dry-type power transformers, HV/MV/LV switchgear, prefabricated substations, energy storage systems, and EV charging infrastructure.

Headquartered in Xinjin District, Chengdu, Sichuan Province, the company holds National “Little Giant” Enterprise status — China’s highest SME innovation designation — alongside National High-Tech Enterprise certification.

Our dry-type transformer portfolio covers 30 kVA to 8000 kVA, configurable to 6 kV, 10 kV, and 35 kV voltage classes, in copper or aluminium winding, to GB, IEC 60076-11, and EU standards for domestic and international projects. The 1250 kVA cast resin dry-type transformer described on this page is one of our most widely deployed medium-capacity units — supplied to industrial parks, commercial buildings, new energy facilities, hospital projects, and international buyers from many countries.

Every transformer we manufacture undergoes full routine testing to IEC 60076-11 or GB/T 10228-2023 before dispatch. Test reports are issued as standard documentation with every order.

Browse all case studies to evaluate Zhongxin General as a supplier — from large-scale hospital installations to European export projects and dedicated industrial substations.

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May 14, 2026 No Comments

Zhongxin General is a China-based manufacturer, factory and supplier of 80 kVA three-phase outdoor oil-immersed distribution transformers — stepping 10 kV down to 400 V with Dyn11 vector group and ONAN cooling. Compliant with GB 1094 (Grade 1/2/3) and IEC 60076, and meeting EU Commission Regulation No. 548/2014 Tier 1 and Tier 2 energy efficiency requirements. Available at 50 Hz or 60 Hz for domestic and international distribution projects.