Technical Specifications
| Parameter | Value |
| Model | S20-8000/35 |
| Product Code | 1ZX.710.3027 |
| Rated Capacity | 8000 kVA |
| Rated Frequency | 50 Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Vector Group | Yd11 |
| Phases | 3-Phase |
| Service Condition | Outdoor |
| Short-Circuit Impedance | 7.91% |
| No-Load Loss | 4592 W |
| No-Load Current | 0.21% |
| Load Loss | 33950 W |
| Insulation Level | HV: LI200 / AC85 kV — LV: LI / AC25 kV |
| Insulating Oil Weight | 3190 kg |
| Active Part Weight | 8420 kg |
| Total Weight | 15300 kg |
| Standard Codes | GB1094.1, 2-2013; GB1094.3-2017; GB/T6451-2023; GB20052-2024 |
| Manufacture Date | April 2026 |
This unit is built to Grade 3 energy efficiency under GB20052-2024 as standard. Zhongxin General can also produce Grade 1 versions on request, with technical standards equal to or higher than EU Commission Regulation No. 548/2014 and Commission Regulation (EU) 2019/1783 Tier 1/2 requirements — the same efficiency benchmark we apply across our full oil-immersed transformer range. As a manufacturing factory, we also offer aluminium winding as an alternative to the standard copper configuration.
An 8000 kVA Transformer at 35kV Class
At 8000 kVA, the S20-8000/35 sits at the upper end of standard 35kV-class distribution capacity, built for industrial substations, production bases, and dedicated power-supply projects that need a robust fixed-ratio unit rather than a load-regulating OLTC transformer. (If your project needs on-load voltage regulation at higher voltage class, see our 8000 kVA 120kV OLTC transformer, built on the same capacity but with a tap-changer and 120kV insulation system.)
Every image on this page documents this specific S20-8000/35 unit through production — winding, insulation, core assembly, drying, and final dispatch — not a different capacity substituted to represent it.
Winding
At this capacity, winding is coordinated work: turn spacing, conductor tension and layer insulation all have to stay consistent across a coil this size, since any deviation shows up later as increased load loss or reduced short-circuit strength.
The clamping fixture holds the coil under even compression while it’s built up, so the finished winding keeps its geometry once the mechanical forces of a fault current are applied in service.
Insulation & Core Assembly
Insulation pretreatment is carried out in batch across multiple active parts, with layer insulation compacted and reinforced by hand — a process that has a direct bearing on the long-term dielectric strength shown by the insulation-level figures on the nameplate.
Core stacking accuracy and clamping pressure at this stage are what the finished no-load loss figure (4592 W) and no-load current (0.21%) ultimately depend on.
Drying & Final Test
Before tanking and oil filling, the active part is dried to remove residual moisture from the insulation system — a mandatory step for any unit rated to withstand the LI200/AC85 kV HV insulation level on this nameplate.
Completed Unit
Why Zhongxin General — Our Advantages Over Other Suppliers
Real product photographs of the actual 8000 kVA unit. Every image on this page documents this specific S20-8000/35 transformer through production — not a different capacity or model substituted to represent it.
Complete capacity-range production tooling. Zhongxin General holds production tooling covering the full oil-immersed transformer range — 30 kVA to 100 MVA — so this 8000 kVA, 35kV-class unit is built with purpose-matched tooling, not adapted from a different rating.
Full in-house manufacturing cycle. Winding, insulation processing, core-coil assembly, drying, oil treatment, tank fabrication and factory acceptance testing all take place at our Sichuan facility.
All energy efficiency grades available. Standard (Grade 3) and Grade 1 versions can be supplied to GB20052-2024, with Grade 1 units meeting and exceeding EU Commission Regulation No. 548/2014 and 2019/1783 requirements for international projects.
Copper and aluminium winding both available. As a manufacturing factory rather than a trading company, we can configure either winding material to match project budget and specification.
Full routine testing, every unit, test report as standard. No transformer leaves our factory without passing the complete routine test programme, documented and issued as standard order documentation.
Track record at this capacity. Our 8000 kVA OLTC transformer has already been exported and put into service — see our 8000kVA 120kV OLTC transformer exported to DR Congo case study — giving us proven manufacturing depth at this exact capacity class.
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 GB1094 / GB/T 6451. Factory Acceptance Test (FAT) with client witness is supported.
Available Options & Configurations
- Winding material: copper (standard) or aluminium
- Energy efficiency grade: GB20052-2024 Grade 3 (standard) or Grade 1
- Frequency: 50 Hz (standard) or 60 Hz
- Vector group and LV configuration: customizable to match project requirements
- Conservator sealing: oil-filled (standard) or nitrogen-sealed for long-distance sea freight
- Export wooden crating with full documentation package
Typical Applications
The 8000 kVA, 35kV-class oil-immersed transformer is specified for industrial production bases, dedicated substations, and power-supply projects that need a fixed-ratio step-down unit at this capacity — for on-load voltage regulation at higher voltage class, our OLTC transformer range is the better fit.
Inquire About the 8000 kVA S20-8000/35 Transformer
Need a quotation, technical datasheet, or Factory Acceptance Test arrangement? Tell us your grid voltage, required LV output, frequency, efficiency grade, and 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, 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, including both fixed-ratio and OLTC configurations up to 120kV class — see our 5000 kVA and 6300 kVA oil-immersed transformer pages for adjacent capacities. Every transformer undergoes full routine testing before dispatch, with test reports issued as standard documentation.
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