20kv class three-phase oil-immersed distribution transformer
Primary Voltage Rating：19kV,20kV,22kV,24kV
Secondary Voltage：0.4kv or others
Rated power：30kva-3150kva
H.V. TAP RANGE: ±2×2.5%
Winding connection: Dyn11/ Yyn0
Winding material： Copper/Aluminum
Cooling Method: ONAN / ONAF
Tapping Method: OLTC/OCTC All available
Standard:IEC60076,ISO9001,GB,ANSI,CSA
Min. order quantity: ≧ 1 set
Packaging Details: International wooden cases or according to the actual transport needs
delivery time： Generally it is 20 days if the goods are in stock, or 30 days if the goods are not. It is according to the quantity.
Payment Method： TT, Western Union， L/C
Description
GE Transformer manufactures high‑efficiency 20kV class three‑phase oil‑immersed distribution transformers designed for substations, industrial facilities, commercial buildings, and renewable energy systems.
Our transformers comply with IEC 60076 and GB/T 1094 standards, ensuring reliable performance, low energy loss, and long service life over 30 years.
Compared with 10kV systems, the 20kV power distribution solution significantly increases transmission capacity, improves voltage quality, and reduces system investment costs.
Key Features & Advantages
1. High Energy Efficiency
Available in S11, S13, and S20 energy‑saving series
No‑load loss reduced by up to 40%
Optimized silicon steel core design
Lower operational and lifecycle costs
2. Premium Copper Windings
High‑purity electrolytic copper conductors
LV winding: copper foil cylindrical structure
HV winding: multi‑layer cylindrical design
Balanced ampere‑turn distribution
Excellent short‑circuit withstand capability
3. Advanced Insulation & Oil Treatment
Vacuum drying of core and windings
Vacuum oil filtration and filling process
Nitrogen sealing to prevent oxidation and moisture
Enhanced dielectric strength
4. Fully Sealed Corrugated Tank Design
Corrugated oil tank with thermal expansion compensation
No external conservator required (optional conservator type available)
Prevents moisture ingress and oil aging
Maintenance‑free operation
5. Strong Mechanical Structure
Core and windings securely clamped
Anti‑loosening lock nuts
Withstands transportation shock and vibration
| Item | Specification |
| Rated Voltage (HV) | 20kV |
| Rated Voltage (LV) | 0.4kV or customized |
| Capacity Range | 30 – 3000 kVA |
| Phase | Three‑Phase |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Insulation Class | Class A |
| Vector Group | Dyn11 / Yyn0 (optional) |
| Tap Changer | ±5% or ±2×2.5% Off‑Circuit Tap Changer |
| Impedance Voltage | According to IEC standard |
| No‑Load Loss | As per S11 / S13 / S20 standard |
| Load Loss | According to capacity rating |
| Noise Level | ≤ 60 dB at 1 meter |
| Oil Tank Type | Corrugated sealed / Conservator type |
| Altitude | ≤1,000m or Customized |
| Accessories | Conservator tank, oil level indicator, gas relay, pressure relief valve, etc. |
| Standards | IEC60076，ANSI C57, IEEE, UL, CSA |
| Warranty | Typically one year, depending on the client’s specific needs |
| Delivery Time | Generally, it is 20-30 days. It is according to the quantity. |
Why Choose GE Transformer?
✅ Professional oil‑immersed transformer manufacturer
✅ Energy-efficient and environmentally friendly design
✅ Strict quality control and factory testing
✅ Third‑party inspection support (SGS / BV)
✅ Global export experience
GE Transformer is committed to delivering reliable, cost‑effective 20kV-class oil‑immersed power transformer solutions for global power distribution projects.