Zhongxin General is a China-based manufacturer, factory and supplier of 6300 kVA three-phase cast resin dry-type transformers — stepping 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 Tier 1 and Tier 2 energy efficiency requirements. Available in copper or aluminium winding, at 50 Hz or 60 Hz, for large industrial, data centre, new energy, and infrastructure projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Rated Capacity | 6300 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 | 100 K / 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) |
Why 6300 kVA Is a Different Class of Transformer
A 6300 kVA cast resin dry-type transformer is not simply a scaled-up version of a 1000 kVA or 2000 kVA unit. At this capacity, the engineering challenges multiply: the LV winding must reliably carry rated currents exceeding 9,000 A; the HV coil mass requires a vacuum casting process capable of producing void-free encapsulation across a significantly larger volume; and mechanical short-circuit withstand forces during fault conditions are an order of magnitude higher than at lower capacities.
This capacity class is the preferred choice for large data centres, industrial parks, new energy generation facilities, petrochemical plants, rail transit traction substations, and major commercial infrastructure projects — where power density, fire safety, and zero-maintenance operation over a 30-year service life are non-negotiable requirements.
Zhongxin General’s production lines in Sichuan support the complete 6300 kVA dry-type transformer manufacturing cycle in-house: from silicon steel core preparation and foil winding through vacuum epoxy casting, curing, final assembly, and full factory acceptance testing. The two units shown above are typical of our batch capability at this capacity.
Manufacturing Process
Low-Voltage Foil Winding & Demoulding
The low-voltage winding adopts a copper foil winding structure — wound by automatic foil winding machine and connected to the LV output copper busbars via argon-protected welding. This process achieves minimal contact resistance and is critical for reliable delivery of the very high rated LV current at 6300 kVA. At this capacity, demoulding requires a team of skilled technicians working in coordination to protect the dimensional integrity of the cured coil.
Initial Assembly & Inspection
Following winding and casting, a senior technician begins the initial assembly and inspection phase — verifying core-coil alignment, checking structural clamping torque, and making preliminary electrical connection inspections before the transformer enters final assembly.
HV & LV Winding Internal Detail
The internal configuration of the HV and LV winding coils reflects the engineering precision required at 6300 kVA. The HV winding is vacuum-cast with filled epoxy resin reinforced with glass fiber mesh plates on inner and outer walls — providing superior short-circuit withstand capability. The inter-winding clearance is designed and verified to IEC 60076-11 insulation level requirements.
HV Copper Busbar & Insulator Connections
At 6300 kVA, both high-voltage and low-voltage busbar connections are engineered to handle the full mechanical and thermal stresses of large-capacity operation. HV terminals are rated for 10 kV class service with appropriate creepage and clearance distances per IEC 60076-11. LV copper busbars are dimensioned for minimal resistive loss at high continuous current.
Temperature Control System
PT100 platinum resistance sensors are embedded in the LV coil windings during manufacturing. These feed into an intelligent temperature controller providing: three-phase winding temperature monitoring and display; over-temperature alarm and trip outputs; automatic fan start/stop; and optional RS485/Modbus communication for centralized monitoring integration. For a 6300 kVA unit operating in a critical industrial facility, this level of thermal visibility is essential.
Cooling Fan System
The ANAF cooling system uses cross-flow top-blowing fans with integrated QR codes for equipment traceability and specification lookup. Under forced-air cooling conditions, the transformer can sustain overload operation beyond nameplate capacity — a practical advantage in facilities with variable peak demand profiles.
Completed & Ready for Dispatch
Every 6300 kVA transformer leaving Zhongxin General’s factory has passed a complete routine test programme to IEC 60076-11 and GB/T 10228-2023. No unit is dispatched without a full test report. The image above shows a completed unit at the end of the production and testing cycle, ready for delivery.
Applicable Standards & Testing
Every 6300 kVA dry-type transformer manufactured by Zhongxin General undergoes a full 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. Factory Acceptance Test (FAT) with client witness is supported. Test reports and ITP documentation are provided as standard with every order.
Available Options & Configurations
- Winding material: copper (standard) or aluminium
- Voltage class: 6 kV, 10 kV, 35 kV; customizable to match local grid standards
- 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 / IP20 / IP30 with metalwork enclosure
- Temperature control: intelligent controller standard; RS485/Modbus optional
- High-altitude versions for installations above 1000 m a.s.l.
- Tropical, high-humidity, and coastal salt-spray versions available
Typical Applications
The 6300 kVA cast resin dry-type transformer is specified where large power demand, fire safety, and indoor installation are required simultaneously:
- Data centres — High-density power supply with zero oil-spill risk
- Large industrial facilities — Chemical plants, mining operations, heavy manufacturing
- New energy projects — Large-scale solar PV step-up and wind farm collection
- Petrochemical & LNG — High fire safety requirements, harsh environments
- Rail transit — Traction substations, station power infrastructure
- Major commercial development — Large mixed-use complexes, airports, hospitals
For examples of how Zhongxin General delivers power infrastructure at this scale, see our 63 MVA / 110 kV OLTC transformer for a Ningxia LNG and helium production facility and our 16,730 kVA intelligent power system for Xinjin District People’s Hospital.
Inquire About 6300 kVA Dry-Type Transformer
Need a quotation, technical datasheet, or Factory Acceptance Test arrangement? Tell us your grid voltage, required LV output, frequency, efficiency grade, voltage class, winding material, and 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 — 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. Every unit undergoes full routine testing before dispatch; test reports are issued as standard documentation with every order.
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