Factory nameplate of the SCB14-250/10 cast resin dry-type transformer — 250 kVA, 10kV/400V, Dyn11, AN/AF, short-circuit impedance 4.02%, total weight 1,170 kg. Compliant with GB1094.1.2-2013, GB/T 10228-2023, GB 20052-2024, GB1094.3-2017.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | SCB14-250/10 |
| Product Code | 1ZX.710.1512A |
| Rated Capacity | 250 kVA |
| Phases | 3-Phase |
| Rated Frequency | 50 Hz |
| High Voltage (5 Taps) | 10,500 / 10,250 / 10,000 / 9,750 / 9,500 V |
| Rated HV Current | 14.4 A |
| Low Voltage | 400 V |
| Rated LV Current | 360.8 A |
| Vector Group | Dyn11 |
| Insulation Level | LI75 AC35 / LI AC3 |
| Insulation Class | H (180 °C) |
| Permissible Temperature Rise | 125 K |
| Cooling Mode | AN / AF |
| Short-Circuit Impedance | 4.02% |
| Service Conditions | Indoor |
| Protection Level | IP00 |
| Total Weight | 1,170 kg |
| Standard Codes | GB1094.1, GB1094.2-2013 · GB20052-2024 · GB/T 10228-2023 · GB1094.3-2017 |
This unit complies with China GB 20052-2024 at the Grade 3 energy efficiency level as standard. Zhongxin General can also produce Grade 1 and Grade 2 versions — the technical standards for Grade 1 products meet and exceed the requirements of COMMISSION REGULATION (EU) No 548/2014 and Commission Regulation (EU) 2019/1783 of 1 October 2019.
Manufacturing Process — From Winding to Dispatch
The quality of a cast resin dry-type transformer is built into the manufacturing process. Every 250 kVA unit from Zhongxin General is produced through the same controlled sequence: coil winding, vacuum epoxy casting, hot-air curing, demoulding, core and coil assembly, factory acceptance testing, final inspection, and dispatch. The images below are all taken on the production line — this is our actual 250 kVA product, not photographs of a larger unit standing in for it.
Unlike many suppliers who show oversized transformers to represent smaller capacities, Zhongxin General holds complete production tooling for the full dry-type capacity range from 30 kVA to 8,000 kVA. The 250 kVA unit has its own dedicated molds and winding fixtures. What you see here is exactly what you receive.
HV Winding
The high-voltage winding uses vacuum-cast filled epoxy resin reinforced with glass fiber mesh plates on both the inner and outer walls. This process virtually eliminates partial discharge and provides the mechanical strength needed to withstand fault current forces.
Vacuum Casting and Curing
After casting, all coils enter a controlled hot-air curing oven for integral forming. The combination of vacuum casting and oven curing produces a dense, void-free encapsulation — the foundation of the SCB14 series’ low partial discharge performance and long service life.
Demoulding
Demoulding reveals the quality of the casting process. Smooth, void-free surfaces mean no internal defects that could develop into partial discharge paths over time. At 250 kVA, the coil dimensions are compact enough to confirm visual quality on every unit.
Assembly and Testing
Following coil assembly onto the silicon steel core — which uses high-permeability cold-rolled grain-oriented silicon steel with a five-stage full-oblique joint structure — the transformer enters the test area. No unit proceeds to finishing until testing is complete.
Post-test painting protects the structural steel components. The fact that painting follows testing — not precedes it — ensures test results reflect the actual transformer, not a pre-coated unit where defects might be concealed.
Final Inspection
Every 250 kVA transformer from Zhongxin General undergoes this final pre-dispatch check. Terminal connections, bolt torques, phase sequence markings, documentation completeness, and visual inspection of all epoxy surfaces are all verified before the unit leaves the factory.
Key Features — 250 kVA Cast Resin Dry-Type Transformer
The 250 kVA cast resin dry-type transformer is one of the most widely deployed capacity points in indoor distribution — used in commercial buildings, industrial facilities, data centres, new energy projects, and hospital power systems where flame-retardant, oil-free, maintenance-free performance is required alongside compact dimensions. The SCB14-250/10 is compact enough for installation in tight substation rooms and building basement substations, while delivering enough capacity to serve a mid-size commercial floor plate or small manufacturing line.
Flame-retardant and environmentally safe. No insulating oil means no risk of fire from oil leaks, no oil containment pit requirement, and no disposal cost. The epoxy-encapsulated windings comply with fire safety requirements that oil-immersed transformers cannot meet in enclosed indoor environments.
Class H insulation, 125 K temperature rise. The SCB14-250/10 carries Class H insulation rated for continuous winding temperatures of 180 °C, with a permitted temperature rise of 125 K. Combined with the AN/AF cooling mode — natural air cooling under normal load, automatic forced-air cooling under peak load — the transformer can sustain short-term overloads without insulation degradation.
Long service life, low partial discharge. Vacuum epoxy casting combined with glass fiber reinforcement produces a winding structure with minimal partial discharge activity. Under normal service conditions, the coils will not crack. Expected service life exceeds 30 years.
Five-position tap changer. The standard off-circuit tap changer provides five voltage positions from 9,500 V to 10,500 V in 250 V steps (±2×2.5%), covering the full voltage variation range typical of 10 kV distribution grids in China and equivalent international systems.
Aluminium winding option available. As a manufacturer operating production lines for both copper and aluminium windings, Zhongxin General can supply the SCB14-250/10 with aluminium foil LV windings and aluminium HV wire at a lower material cost for budget-sensitive projects.
Why Zhongxin General — Our Advantages Over Other Suppliers
When evaluating a 250 kVA dry-type transformer supplier, the distinction between a real manufacturer and a trading operation matters. Here is how Zhongxin General compares:
Real product photos, not placeholders. Every image on this page shows an actual 250 kVA unit from our production line. Many competitors show photographs of 1,000 kVA or larger transformers to represent their 250 kVA products, because they lack the production volume or tooling to photograph the correct unit. The difference in coil dimensions, core stack height, and terminal configuration is significant — and visible. Our ten production photos show precisely what you will receive.
Complete capacity-range tooling. Zhongxin General holds production molds and winding fixtures covering the complete 30 kVA to 8,000 kVA range. For the 250 kVA capacity, this means dedicated tooling — not adaptation of larger-capacity fixtures — which results in correctly proportioned coils, optimised core-to-winding clearances, and repeatable production quality.
Factory, not trading company. Sichuan Zhongxin General Electric Energy Co., Ltd. is a National “Little Giant” Enterprise and National High-Tech Enterprise, headquartered in Xinjin District, Chengdu, with its own manufacturing facility at No.998 Xinghua 5 Road. We manufacture, test, and dispatch from a single site — there is no intermediary.
Full routine testing on every unit. No 250 kVA transformer leaves our factory without a complete test report. Trading companies or small workshops often do not have the test equipment to conduct induced overvoltage withstand or separate-source AC withstand tests. We do, on every unit.
EU-compliant energy efficiency grades. Our Grade 1 efficiency products (GB 20052-2024) satisfy and exceed the requirements of EU Commission Regulation No. 548/2014 and 2019/1783, making them directly applicable to European, Middle Eastern, and other international markets without additional compliance work.
Rapid delivery from stock tooling. Holding complete capacity-range tooling means no custom tooling lead time for 250 kVA orders. Standard production lead times are competitive with the market; for urgent requirements, our production scheduling team can advise on current capacity.
Applicable Standards and Testing
Every SCB14-250/10 transformer manufactured by Zhongxin General undergoes a complete routine test programme before dispatch.
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 (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 to IEC 60076-11 and GB/T 10228-2023. Test reports are issued as standard documentation with every order. Factory Acceptance Test (FAT) with client witness is supported.
Available Options and Configurations
Winding material: copper (standard) or aluminium. Voltage class: 6 kV, 10 kV, 35 kV. Low voltage: 380 V, 400 V, 415 V, 433 V or other values. 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); OLTC available on request. Protection degree: IP00 (open, standard) / IP20 / IP30 with metalwork enclosure. Temperature control: intelligent controller standard; RS485/Modbus optional. High-altitude and tropical versions available.
Typical Applications
The 250 kVA cast resin dry-type transformer is widely used in commercial buildings, industrial parks, new energy facilities (solar PV step-up, wind farm collection), hospital and healthcare infrastructure, data centres, rail transit stations, and campus and residential developments where indoor installation and fire safety are required simultaneously.
Dispatch
Zhongxin General’s production lines support batch production across the complete capacity range. For examples of project deliveries at larger scale, see our case studies →, including the 16,730 kVA intelligent power system for Xinjin District People’s Hospital and the Aktau Port Kazakhstan prefabricated substation.
Inquire About 250 kVA Dry-Type Transformer
Need a quotation, technical datasheet, or test report for the 250 kVA cast resin dry-type transformer? Tell us your grid voltage, required LV output, frequency, efficiency grade, winding material, and any special 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 transformers and dry-type power transformers, HV/MV/LV switchgear, prefabricated substations, and energy storage systems. Headquartered in Xinjin District, Chengdu, Sichuan Province, the company holds National “Little Giant” Enterprise status alongside National High-Tech Enterprise certification.
Our dry-type transformer portfolio covers 30 kVA to 8,000 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. Every unit undergoes full routine testing before dispatch; test reports are issued as standard documentation with every order.
Browse all case studies → and company news → to evaluate Zhongxin General as a supplier.
