Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | S11-6300/35 |
| Product Code | 1ZX.710.3131 |
| Rated Capacity | 6300 kVA |
| Vector Group | Dyn11 |
| Number of Phases | 3 (Three-phase) |
| Rated Frequency | 50 Hz |
| Cooling Mode | ONAN |
| Service Conditions | Outdoor |
| Insulation Level | HV LI 170 AC 85 kV / LV LI AC 5 kV |
| Short-Circuit Impedance | 8.62% |
| No-load Loss | 5167 W |
| No-load Current | 0.25% |
| Load Loss | 38060 W |
| Insulating Oil Weight | 2360 kg |
| Active Part Weight | 5880 kg |
| Total Weight | 11500 kg |
| Ex-factory No. | A250413 |
| Ex-factory Date | November 2025 |
| Standard Codes | GB1094.1.2-2013 / GB1094.3-2017 / GB/T6451-2023 / GB20052-2020 |
| Manufacturer | Sichuan Zhongxin General Electric Energy Co., Ltd. |
This unit ships to China GB 20052-2020 Grade 3 energy efficiency as standard. Zhongxin General also produces Grade 1 and Grade 2 versions on request — Grade 1 units meet and exceed the requirements of EU Commission Regulation No. 548/2014 and Commission Regulation (EU) 2019/1783 Tier 1 and Tier 2, making them directly deployable for European and EU-aligned market projects. Both copper and aluminium winding configurations are manufactured in-house.
6300 kVA — Engineering Considerations at This Capacity
At 6300 kVA, this transformer sits above the standard distribution class and is typically applied as a dedicated substation transformer or industrial main transformer at the 35 kV level. The 8.62% short-circuit impedance and 38,060 W load loss are both figures confirmed by routine test on every unit — values that busbar sizing, protection relay settings and cable termination design should be based on directly, rather than estimated from a smaller-capacity unit.
The HV insulation level of LI 170 AC 85 kV reflects the higher lightning-impulse and power-frequency withstand requirements of the 35 kV class, verified by type test and confirmed through the induced and separate-source AC withstand tests performed as part of the routine test programme before dispatch.
Manufacturing Process — Core to Finished Unit
Core lamination stacking at this capacity requires precise joint alignment and clamping pressure. Every layer is stacked and measured before the winding stage begins, since deviations at this step compound directly into the no-load loss figure that later appears on the nameplate.
Winding Insulation & Cooling Structure
The internal cooling ducts built into each winding layer are sized specifically for the 6300 kVA load loss figure, allowing insulating oil to circulate through the winding by natural convection — the core requirement for reliable ONAN performance without any fans or pumps.
Lead Connection & Insulation Processing
Once winding assembly is complete, HV and LV lead wires are routed and insulated to maintain the rated insulation clearances before the active part proceeds to drying and tanking.
Finished Unit
The corrugated fin radiator provides the surface area required for natural oil and air convection cooling at full 6300 kVA load — no fans, pumps, or auxiliary power draw, keeping long-term maintenance limited to periodic oil checks and visual inspection of bushings and fittings.
Why Zhongxin General — Manufacturer Advantages
Real production photographs of the actual 6300 kVA unit. Every image on this page — nameplate, core lamination, winding, lead assembly, finished unit and dispatch — documents this specific capacity, produced at our Sichuan facility, not photographs borrowed from a different capacity or product line.
Complete capacity-range production tooling. Our oil-immersed transformer range spans 30 kVA to 100 MVA, each capacity built with dedicated tooling rather than adapted equipment, ensuring dimensional consistency and predictable delivery.
Full in-house production cycle. Winding, insulation processing, core-coil assembly, oil treatment, tank assembly and routine testing all take place at our Xinjin District, Chengdu factory — no outsourcing of critical manufacturing steps.
All energy efficiency grades available. Grade 1, Grade 2 and Grade 3 versions to GB 20052-2020, with Grade 1 meeting and exceeding EU Commission Regulation No. 548/2014 and 2019/1783 Tier 1/2 requirements — see how we handle EU compliance documentation in our 1250 kVA dry-type transformer European export case study.
Copper and aluminium winding both available, manufactured on separate in-house production lines.
Full routine testing, every unit, test report as standard. No transformer leaves our factory without a complete routine test programme and standard test report.
Documented project experience at this capacity class. Our company news and case studies pages document delivered projects across China and internationally at comparable and larger capacities, including 35 kV-class dedicated substation transformers.
Applicable Standards & Testing
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.
Type tests (reports available on request): temperature rise test; lightning impulse test.
Special tests (available on request): partial discharge measurement; sound level (noise) measurement; short-circuit withstand test.
All tests are conducted to IEC 60076 and GB 1094 / GB/T 6451. 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: 35 kV HV as standard; customizable to match local grid standards (10 kV, 33 kV, 38.5 kV and others)
- Frequency: 50 Hz (standard) or 60 Hz
- Energy efficiency grade: GB 20052-2020 Grade 1, Grade 2, or Grade 3
- Tap changer: off-circuit tap changer with standard ±2×2.5% adjustment range
- Service conditions: outdoor (standard); indoor version available
- Oil type: mineral oil (standard); alternative dielectric fluids available for special environments
- Nitrogen-sealed tank for long-distance sea freight
- Export wooden crating with full documentation package
Typical Applications
The 6300 kVA oil-immersed transformer is commonly specified as a dedicated 35 kV substation transformer for large industrial facilities, mining operations, and data centers, and as a main transformer in multi-transformer substation configurations where higher single-unit capacity reduces the total number of transformers required on site. Its Dyn11 vector group and ONAN cooling make it a standard configuration for medium-to-large-scale grid connection across China and in international markets following GB or IEC standards. For projects requiring an integrated, factory-tested delivery, this capacity can also be paired with our prefabricated substation solutions.
Dispatch
At a total weight of 11,500 kg, the 6300 kVA unit requires a heavy-duty flatbed for road transport. Once routine testing is complete, units are crane-loaded, blocked and secured according to our standard transport procedures. For international export, units can be prepared with nitrogen sealing of the tank and export-grade wooden crating — the same logistics process documented in our project deliveries to Central Asia, South Asia, Africa and Europe. For comparison at nearby capacity points, see our 2500 kVA and 5000 kVA oil-immersed transformer pages.
Inquire About 6300 kVA Oil-Immersed Transformer
Need a quotation, technical datasheet, or Factory Acceptance Test arrangement for the 6300 kVA oil-immersed transformer? Tell us your grid voltage, required LV output, frequency, efficiency grade, 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 — Oil-Immersed 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 oil-immersed transformer portfolio covers 30 kVA to 100 MVA, configurable to 6 kV, 10 kV, 35 kV, 66 kV, 110 kV and higher voltage classes, in both GB and IEC standard configurations for domestic and international projects.
Every transformer we manufacture undergoes full routine testing to IEC 60076 or GB 1094 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.
