35kv Oil Immersed Power Distribution Transformer

s11-630kva Oil-immersed transformer with conservatorThe transformer core is made of imported high-quality cold-rolled silicon steel sheet, which greatly reduces no-load loss and no-load current. The core is tightly bound to ensure the compactness and reduce noise.* The high and low voltage windings are made of oxygen-free copper. The low voltage winding of 500KVA and below is of double-layer cylinder structure, of 630kVA and above adopt double helix or four helix structure. High-voltage winding adopts multi-layer cylinder structure.* Dyn11 is used in t...

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s11-630kva Oil-immersed transformer with conservator

The transformer core is made of imported high-quality cold-rolled silicon steel sheet, which greatly reduces no-load loss and no-load current. The core is tightly bound to ensure the compactness and reduce noise.
* The high and low voltage windings are made of oxygen-free copper. The low voltage winding of 500KVA and below is of double-layer cylinder structure, of 630kVA and above adopt double helix or four helix structure. High-voltage winding adopts multi-layer cylinder structure.
* Dyn11 is used in the transformer connection group to reduce the influence of harmonics on the power grid and improve the quality of power supply.
* The transformer is a fully sealed structure, with three coats of primer and one coat of finish paint applied on the inner and outer surfaces. The product is salt fog proof, moisture proof and fungus-proofing, beautiful, durable and reliable
* The measured noise value is lower than the standard and maintenance free under normal operation.

Delivered to	South Africa
Year	2020
Model	S11-1500KVA-11 / 6.6KV
Type	Oil Immersed Distribution Transformer
Standard	IEC60076
RatedPower	1.5 MVA
Frequency	50 HZ
Phase	Three
Cooling Type	ONAN
Primary Voltage	11 KV
Secondary Voltage	6.6 KV
Winding Material	Copper
Vector Group	Dyn11
Impedance	6.5%
Tap Changer	NLTC
Tapping Range	±2*2.5% @ Primary Side
NoLoad Loss	1.6 KW
On Load Loss	16 KW
Accessories	Standard Configuration
Remarks	N/A

35kV Oil Immersed Power Distribution Transformer – S11 Series for Reliable Rural & Industrial Grids

35kV Oil Immersed Power Distribution Transformer S11-630kVA

Engineered for high-voltage utility and industrial applications, the 35kV Oil Immersed Power Distribution Transformer (S11 series, e.g., 630kVA or 1500kVA) combines robust construction with advanced energy efficiency. Featuring a core made from imported cold-rolled silicon steel and oxygen-free copper windings, it achieves significantly reduced no-load losses and ultra-low operating noise—ideal for remote substations, mining operations, and rural electrification projects.

The transformer adopts a fully sealed conservator design with triple-layer anti-corrosion coating, offering superior protection against salt fog, humidity, and fungal growth—ensuring decades of maintenance-free service even in harsh climates like those in South Africa, where units have been successfully deployed since 2020.

High-voltage sealed oil transformer – reliable performance at 35kV with ONAN cooling and NLTC tap changer for stable voltage regulation
Low-loss copper-wound distribution unit – optimized helical winding structure minimizes load losses and enhances short-circuit withstand capability
Dyn11 vector group power transformer – suppresses harmonic distortion and improves power quality in three-phase networks

Compliant with IEC 60076 standards, this three-phase unit supports primary voltages up to 35kV and secondary outputs such as 6.6kV or 11kV, with a standard impedance of 6.5% and ±2×2.5% tap range. Its Dyn11 connection enhances compatibility with modern grids by reducing zero-sequence currents and improving fault resilience.

Whether mounted on poles or installed in outdoor substations, the S11 oil-immersed transformer delivers durability, efficiency, and grid stability—making it a trusted choice for utilities and industrial operators worldwide.