Technical Specifications
| Parameter | Value |
|---|---|
| Product Name | Power Transformer |
| Model | S-5000/33GY |
| Product Code | 1ZX.710.3306 |
| Rated Capacity | 5000 kVA |
| Frequency | 50 Hz |
| Impedance | 7.34% |
| No-load Loss | 3249 W |
| No-load Current | 0.23% |
| Load Loss | 29170 W |
| Insulation Level | HV terminal LI200 AC85 kV; LV terminal LI60 AC25 kV |
| Vector Group | YNd11 |
| Phases | 3-Phase |
| Service Conditions | Outdoor |
| Cooling Mode | ONAN |
| Oil Tank Vacuum Tolerance | 49 kPa |
| Weight of Oil | 2055 kg |
| Active Part Mass | 5575 kg |
| Gross Weight | 9870 kg |
| Standard Codes | GB1094.1, 2-2013; GB1094.3-2017; GB/T6451-2023; GB20052-2024 |
| Manufacturer | Sichuan Zhongxin General Electric Energy Co., Ltd. |
Tapping Step Table
| Step | HV (V) | HV (A) | LV (V) | LV (A) |
|---|---|---|---|---|
| 1 | 36300 | 79.5 | 6300 | 458.2 |
| 2 | 35475 | 81.4 | ||
| 3 | 34650 | 83.3 | ||
| 4 | 33825 | 85.3 | ||
| 5 | 33000 | 87.5 | ||
| 6 | 32175 | 89.7 | ||
| 7 | 31350 | 92.1 |
The nameplate parameters shown above are from the actual S-5000/33GY unit manufactured at Zhongxin General’s Sichuan facility. Every parameter is verified through routine factory acceptance testing before dispatch.
This product complies with GB 20052-2024 energy efficiency requirements as standard. We can also produce Grade 1 energy efficiency and other efficiency-grade versions whose technical standards are equivalent to or higher than the relevant provisions of COMMISSION REGULATION (EU) No 548/2014 and Commission Regulation (EU) 2019/1783 of 1 October 2019. As a manufacturing factory, we also offer aluminium-winding versions of this transformer as an alternative to the standard copper winding configuration.
Manufacturing Process — From Insulation to Dispatch
A 5000 kVA oil-immersed power transformer sits at a capacity point where manual craftsmanship and engineering precision matter more, not less. The active part is large enough that insulation compaction, lead wire dressing, and frame measurement cannot be rushed — each step below is documented from our own production line for this specific unit, not borrowed from a different capacity.
Insulation Compaction
Multiple technicians work together to compact and seat the oil-impregnated insulation paper around the windings. At 5000 kVA, the insulation volume is substantial, and uneven compaction can leave voids that compromise long-term dielectric performance — this is hand work that does not scale down to a single operator.
Core and Coil Assembly
Core-coil assembly at this capacity requires a coordinated two-person team to stack and align the top yoke laminations accurately. Joint geometry and clamping pressure at this stage directly determine the no-load loss figure that appears on the finished nameplate.
Frame Measurement and Lead Wire Processing
Before drying, the internal frame is measured to confirm structural clamping and insulation clearances are within tolerance, and the HV/LV lead wires are routed and insulated to maintain the rated insulation levels of LI200 AC85 kV (HV) and LI60 AC25 kV (LV).
Test Preparation and Routine Testing
No unit proceeds to finishing until the complete routine test programme is passed, confirming the no-load loss (3249 W), load loss (29170 W), and impedance (7.34%) figures shown on the nameplate.
Finished Product
The corrugated fin tank, conservator, breather, and oil level gauge work together as a complete ONAN cooling and oil-protection system, sized for the 2,055 kg of insulating oil and 9,870 kg gross weight of this unit — built to operate reliably outdoors for decades with minimal maintenance.
Why Zhongxin General — Our Advantages Over Other Suppliers
Real product photographs at the actual capacity. Every image on this page documents this specific 5000 kVA unit — from insulation work through to factory dispatch. Many suppliers use photographs of a different capacity unit to represent products they have not actually built at this rating. The difference is visible in tank proportions, radiator count, and bushing scale, and it matters to a buyer trying to judge what they will actually receive.
Complete capacity-range production tooling. Zhongxin General holds full production tooling across the complete oil-immersed transformer capacity range — meaning the 5000 kVA unit is built with dedicated tooling matched to its dimensions, not adapted from a different capacity. This enables consistent dimensional precision and faster, more predictable delivery.
Full in-house production cycle. Winding, insulation processing, core-coil assembly, oil treatment, tank assembly, and factory acceptance testing all take place at our Sichuan facility — no outsourcing of critical manufacturing steps.
All energy efficiency grades available. We produce Grade 1, Grade 2, and Grade 3 versions to GB 20052-2024. Our Grade 1 units meet and exceed EU Commission Regulation No. 548/2014 and 2019/1783 Tier 1 and Tier 2 requirements.
Copper and aluminium winding both available. As a manufacturing factory rather than a trading company, we offer both winding configurations to match project budget and specification requirements.
Full routine testing, every unit, test report as standard. No transformer leaves our factory without passing the complete routine test programme and receiving a standard test report — not on request, but as default documentation with every order.
Documented international project experience. This same S-5000/33GY model has been exported as a hydropower step-up transformer to Nepal’s Chino Hydropower Station project, demonstrating proven field performance at this exact capacity and voltage class. Browse our case studies for further documented evidence.
Applicable Standards & Testing
Every 5000 kVA oil-immersed 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
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: 33 kV HV / 6.3 kV LV as standard; customizable to match local grid standards
- Frequency: 50 Hz (standard) or 60 Hz
- Energy efficiency grade: GB 20052-2024 Grade 1, Grade 2, or Grade 3
- Service conditions: outdoor (standard); indoor version available
- Oil type: mineral oil (standard); silicone oil for high-fire-safety environments available on request
- Nitrogen-sealed tank for long-distance sea freight
- Export wooden crating with full documentation package
Typical Applications
The 5000 kVA oil-immersed power transformer is widely used as a step-up or step-down unit for hydropower stations, industrial substations, mining operations, and dedicated power supply projects requiring outdoor, low-maintenance operation at medium-voltage class. Its YNd11 vector group and ONAN cooling make it well suited to grid-interconnection and generation-side step-up applications, as demonstrated in our Nepal hydropower export project.
Dispatch
Our export experience spans Europe, Central Asia, South Asia, and Africa, developed through real projects including a 1250 kVA dry-type transformer export to Europe, a 5000 kVA step-up transformer for a Nepal hydropower station, and a prefabricated substation for Aktau Port, Kazakhstan. The same logistics and documentation processes apply to 5000 kVA distribution transformer orders, whether shipped as a single unit or as part of a larger mixed-capacity batch.
Inquire About 5000 kVA Oil-Immersed Transformer
Need a quotation, technical datasheet, or Factory Acceptance Test arrangement for the 5000 kVA oil-immersed distribution 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 — China’s highest SME innovation designation — 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. The 50 kVA oil-immersed distribution transformer described on this page is the entry-capacity point of our standard distribution range — supplied to rural distribution networks, telecom and agricultural power projects, and small commercial installations across China and international markets.
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.
