The S22 series Three Phase Oil Immersed Transformers are constructed using high-quality 3OP series silicon steel from Shanxi, featuring foil-wound electromagnetic coils and advanced insulation materials and processes. Three phase oil immersed transformers are designed with high heat resistance, high impact resistance,and a fully sealed structure to ensure stable transformer oil quality, extending maintenance intervals.
The entire oil tank is composed of wavy chip radiators, treated with phosphating and double-layer anti-rust coating, providing excellent aging resistance.
The S22 series is a new energy-efficient Three Phase Oil.
Immersed Transformer with a rated capacity ranging from 30KVA to 2500KVA, suitable for power systems operating at voltages between 6KV and 11KV, making it the primary equipment for small and medium-sized substations.
Basic information
Type: Oil Immersed Transformer
Phase: Three
Service Voltage: 6KV-11KV
Rated Capacity:30KVA~250OkVA
Vector group:Yyn0, Dyn11
Cooling type: ONAN
Core material: CRGO
Winding material: Copper/aluminum
Available fluids: mineral oil and ester fluids
Purpose:Three-phase pole mounted oil filled transformers are intended for transforming of electric energy in utility grid and in energy consumer networks.
Product Standards:
IEC 60076 Standard System for Power Transformers
GB 1094 Power Transformer
GB/T 15164 Oil-immersed power transformer load guide
GB/T 6451 Three-phase oil-immersed power transformer
technical parameters and requirements
Three Phase Oil Immersed Transformer features:
The S22 series fully sealed three phase oil immersed transformers utilize wavy tank fins as cooling elements. This design isolates the internal transformer components from the atmosphere, preventing moisture and aging-related deterioration of oil and insulation, thereby enhancing operational reliability.
The oil tank is expertly welded, ensuring smoothness, flatness,and uniform thickness to prevent oil leakage.The core employs O.23mm high-permeability laser-scribed plates and a stepped five-stage slot structure, reducing no-load loss and current. Lock nuts secure the core tension and clamping.
High-voltage windings use multi-layer wire with special interlayer insulation materials to improve mechanical strength. Low-voltage windings are either single-layer or new coil, utilizing dot tape for interlayer insulation and formed end rings for full support, ensuring gap-free construction and robust mechanical strength.
For pressure protection, pressure relief valves are selected. Gas protection utilizes QJ4 gas relays for transformers above 80OkVA. Transformers above 100OkVA feature signal thermometers for remote oil temperature monitoring.
Oil Immersed Hermetically Sealed Transformer Advantage:
High Efficiency: Optimized core and coil structures reduce reluctance and copper loss, improving conversion efficiency.
No-load loss is 20% lower than S13 transformers, and load loss is 30% lower, meeting national energy efficiency standards.
Low Noise: Core and coil optimizations result in noise levels below 60dB, reaching domestic advanced standards. Special designs can be made upon user request to meet specific grid requirements.
Compact Design: High-quality materials and manufacturing processes enable higher power density, resulting in smaller size and weight.
Environmental Protection and Energy Saving: Reduced losses minimize heat and CO2 emissions, meeting environmental standards while lowering operational costs and improving grid efficiency.
Safety and Reliability: High-quality materials and manufacturing ensure superior safety, reliability, and durability.
Cost-Effective Maintenance: Modular design reduces maintenance costs and enhances practicality.
Q1. What defines "Super Premium Efficiency (Level 1)" for this transformer?
A: Efficiency Level 1 is the highest energy-saving tier (compliant with standards like GB 20052-2020 Level 1 or global Eco-design Tier 2). It features the lowest possible no-load and load losses in the industry. By choosing Level 1, you reduce energy waste by up to 25-40% compared to standard Level 3 transformers.
Q2. What are the core benefits of a Pole-Mounted design?
A: Pole-mounted transformers are "space-savers." They are designed to be installed directly on utility poles (single or H-frame), making them ideal for rural electrification, residential streets, and construction sites where ground space is limited or expensive.
Q3. How does the "Hermetically Sealed" construction work?
A: Our Level 1 transformers are Hermetically Sealed, meaning the insulating oil is completely isolated from the outside atmosphere. We use a corrugated tank that expands and contracts with temperature changes. This prevents oxygen and moisture from entering, which eliminates oil aging and makes the unit maintenance-free for its entire lifespan.
Q4. What materials allow for such high efficiency in Level 1 models?
A: To reach Level 1 standards, our Shanxi factory uses ultra-low loss High-Permeability Grain-Oriented (Hi-B) Silicon Steel for the core and High-Purity Oxygen-Free Copper for the windings. This combination ensures maximum conductivity and minimum magnetic resistance.
Q5. Is the transformer enclosure durable enough for harsh outdoor environments?
A: Yes. Every unit undergoes a rigorous surface treatment: shot-blasting followed by a multi-layer anti-corrosive powder coating (Standard RAL 7035). For coastal or high-pollution areas, we offer Hot-Dip Galvanization to ensure 30+ years of rust-free operation.
Q6. What safety features are integrated into the tank?
A: Safety is built-in. Standard features include a Pressure Relief Valve (to prevent tank rupture), an Oil Level Gauge, and high-voltage/low-voltage bushings. We can also provide integrated brackets for Lightning Arresters and Drop-out Fuses to simplify your on-pole installation.
Q7. Does the transformer handle high ambient temperatures?
A: Absolutely. The Corrugated Fin design provides a large surface area for natural air cooling (ONAN). Combined with high-flash-point mineral oil, our transformers are tested to operate reliably in ambient temperatures up to 50°C (122°F) without degrading the insulation.
Q8. What are the standard Voltage Ratios and Vector Groups?
A: We support all major international grid voltages, such as 11kV/400V, 20kV/415V, or 33kV/433V. Standard vector groups are typically Dyn11 or Yyn0. Every unit includes an Off-Circuit Tap Changer (OCTC) with a $\pm 2 \times 2.5\%$ range for fine-tuning your output voltage.
Q9. What testing standards do your Level 1 transformers meet?
A: All units are manufactured and tested in accordance with IEC 60076 or ANSI/IEEE C57. Before shipping, we conduct a full Routine Test, including:
No-load and Full-load Loss Verification (to guarantee Level 1 status).
Insulation Resistance and Dielectric Tests.
Voltage Ratio and Vector Group Verification.
Q10. How do you protect the transformer during international shipping?
A: We use heavy-duty reinforced steel-framed plywood crates. The transformer is securely bolted to a pallet to prevent movement. High-voltage bushings are covered with impact-resistant protectors, and the entire unit is vacuum-packed in moisture-proof plastic to ensure it arrives at your site in perfect condition.
