GTXGN-12 Solid Insulated Ring Main Unit
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33kV Oil-Immersed Transformer
33kV Oil-Immersed Transformer provides reliable voltage conversion for substations, industrial facilities, utility networks, and renewable energy projects, with stable outdoor performance, strong overload capacity, and customizable technical configurations.
33kV Oil-Immersed Transformer
The 33kV S11, SZ11, and SFZ11 series power transformers are engineered to meet the rigorous standards of IEC60076 and GB1094. Designed for efficient energy management in power substations, these electrical transformers provide precise voltage regulation, reliability, and durability. Their advanced oil-immersed design ensures optimal performance in industrial and commercial applications.
Key Features:
The 33kV oil-immersed transformer uses transformer oil as the insulation and cooling medium. It has a stable voltage level, strong overload capacity, and high reliability, making it suitable for long-term outdoor operation. Its mature structure, moderate cost, and long service life make it widely used in substations, industrial and mining enterprises, and power grid distribution. However, attention should be given to fire prevention, leakage prevention, and regular oil quality maintenance.
Why choose a 33 kV oil-immersed transformer
This series represents a new generation of AC transformers, delivering low energy losses, reduced noise levels, and superior operational efficiency. The product’s innovative step-lap core seam design eliminates localized magnetic flux saturation, while its sealed oil tank reduces maintenance by eliminating exposure to air and moisture. These power transformers are ideal for power substations, offering robust voltage regulation and economic benefits.
The transformer’s load tap changers ensure adaptability in diverse operating conditions, making it suitable for demanding environments. Its compliance with international standards guarantees reliable performance and long-term value.
Product Advantages
Load Tap Changer: Voltage adjustment ranges of 35±22.5%kV, 38.5±22.5%kV, 35±32.5%kV, and 38.5±32.5%kV ensure stable output voltage through manual, electric, or automatic adjustments.
Core Design: Fully inclined step-lap seams enhance magnetic flux distribution, minimizing no-load loss, no-load current, and noise. The laminated steel structure improves the core’s mechanical integrity.
Oil Tank: A reinforced corrugated panel design boosts mechanical strength, reduces weld seams, and enhances the transformer’s external aesthetics.
Enhanced Durability: High-strength laminated wood supports the transformer core, providing reliable short-circuit resistance and positioning stability.
Operating Conditions
Rated Voltage: ≤33kV.
Altitude: ≤1000m.
Ambient Temperature: -25°C to +40°C.
Installation: Indoor or outdoor installations in industrial settings.
Application
The 33kV oil-immersed transformer is mainly used in scenarios such as power grid transmission and distribution, industrial and mining enterprises, industrial parks, new energy power stations, and urban and rural substations. As a voltage conversion device between the 33kV high-voltage side and the 11kV/0.4kV low-voltage side, it is suitable for long-term stable operation outdoors and is widely applied in power plants, substations, petrochemical industries, mines, large industrial areas, and wind power and photovoltaic grid connections, etc., where high reliability, overload capacity and service life are required.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| S11-M-XXXX/33 | S: | Three-phase transformer |
| 11: | Performance level code, the higher the number, the lower the loss | |
| M: | Fully sealed structure, prevents oil aging and is maintenance-free | |
| XXXX: | Rated capacity (kVA), such as 1000, 2000, 3150, 5000, 10000 | |
| 33: | Rated voltage 33kV (high-voltage side) |
Technical Parameters
| Item | Specification |
|---|---|
| Rated Voltage | HV: 33 kV; LV: 11 kV or 0.4 kV |
| Rated Capacity | 500–31,500 kVA (common: 1000 / 2000 / 3150 / 5000 / 10,000 kVA) |
| Number of Phases / Frequency | Three-phase, 50 Hz |
| Vector Group | Dyn11 or YNd11 |
| Cooling Method | ONAN (Oil Natural Air Natural) / ONAF (Oil Natural Air Forced) |
| Insulating Medium | 25# transformer oil |
| Tap Changer | Off-circuit tap changer: ±5% or ±2 × 2.5% |
| Impedance Voltage | 6.5%–8% (depending on capacity and standards) |
| Insulation Level | HV: LI 200 kV / AC 95 kV; LV: LI 75 kV / AC 35 kV |
| Operating Environment | Indoor / Outdoor, -25°C to +40°C |
| Structure Type | Hermetically sealed (M) / Non-sealed |
| Loss Level | S11, S13, S15 (low-loss types) |
| Winding Material | All copper winding (standard) |
| Degree of Protection | IP00 (up to IP20 with enclosure for outdoor use) |
Overall and mounting dimensions(mm)（Reference）
Custom 33kV Oil-Immersed Transformer Solutions
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