What Are Oil-Filled Distribution Transformers?

Three-phase oil-filled distribution transformers are essential electrical equipment in power distribution systems, designed to step down high voltage (e.g., 3.3kV, 6.6kV, 11kV, 33kV) to lower voltage levels (e.g., 400V, 415V, 433V). They use oil as a cooling and insulating medium to ensure reliable operation under high loads and demanding conditions.

Why Use Oil-Filled Distribution Transformers?

• High Efficiency: Feature low-loss silicon steel cores (e.g., ≤980W no-load losses for 1000kVA) and optimized windings, meeting standards like DOE 2016 for energy efficiency.

• Durability: Robust design with corrosion-resistant steel tanks and high-grade insulation materials ensures a long service life (20–30 years) and strong short-circuit resistance.

• Eco-Friendly Options: Offer biodegradable insulating oils to minimize environmental impact.

Key Features of Oil-Filled Distribution Transformers

• Construction: High-permeability silicon steel cores and high-conductivity copper/aluminum windings reduce losses and noise (<60 dB for 1000kVA).

• Insulation and Cooling: Mineral or biodegradable oil provides excellent dielectric strength and cooling, with ONAN/ONAF cooling systems and radiators for heat dissipation.

• Safety: Equipped with Buchholz relays, pressure relief valves, oil level indicators, and optional surge arresters or tap changers for voltage regulation.

• Adaptability: Suitable for indoor/outdoor use with IP ratings (e.g., IP54) for harsh environments.

Applications of Oil-Filled Distribution Transformers

• Power Distribution: Widely used in utility grids, industrial plants, commercial buildings, and renewable energy systems (e.g., solar or wind farms).

• Customizable Configurations: Available in various power ratings (50kVA–2500kVA), voltage classes, and impedance levels to meet specific project needs.

Standards and Compliance

• International Standards: Conforms to IEC 60076, ANSI/IEEE C57.12, AS, CSA, and GB standards.

• Certifications: Optional certifications for energy efficiency, environmental impact, and safety.

Advantages of Oil-Filled Distribution Transformers

• Reliability: Ensures consistent performance with minimal maintenance.

• Cost-Effectiveness: Low operational and maintenance costs.

• Environmental Adaptability: Designed for diverse conditions, with low noise for urban compatibility.

Choose  CHBEB 3-phase Oil Filled Distribution Transformers for a reliable, efficient, and durable power distribution solution that will serve your electrical needs for years to come.

For detailed technical specifications, pricing, or customization options, contact the manufacturer or refer to their official documentation.

Technical data

Capacity (kVA)	Voltage Combination			Vector group	No-load loss (W)	Load loss (W) (75°C)	Impedance voltage (%)	No-load current (%)
	HV	Tapping range of HV	LV
25	6 kV 6.6Kv 10.5kV 11kV	±5%,±2×2.5%	0.38 kV 0.4 kV 0.415 kV 0.48 kV	Yyn0 Dyn5 Dyn11	100	600	4.0	1.7
50					130	870		1.6
63					150	1040		1.5
80					180	1250		1.4
100					200	1500		1.3
125					240	1800		1.2
160					280	2200		1.1
200					340	2600		1
250					400	3050		0.9
315					480	3650		0.9
400					570	4300		0.8
500					680	5100		0.8
630					810	6200	4.5	0.7
800					980	7500		0.6
1000					1160	10300		0.55
1250					1360	12000		0.5
1600					1640	14500		0.45
2000					1940	18500	5.5	0.4
2500					2300	20500		0.4