250kva 0.4kv Pad Mounted Oil Immersed Transformer

Since its establishment in 2006, Wenzhou XiFa Electric Power Equipment Co., Ltd has grown into a leading power equipment supplier in the industry. We focused on industrial power distribution field, providing reliable and efficient transformer solutions to empower the global energy transition. 250kva 0.4kv pad mounted oil immersed transformer is a pad mounted transformer specifically designed for underground power supply networks. It converts high voltage electricity such as 10kV or 35kV into 400V, providing power for residential areas, commercial centers, industrial parks and municipal projects.

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Product Description

The transformer can be fully customized according to the specific requirements of the customers.This 250kva 0.4kv pad mounted oil immersed transformer offers a variety of selectable specifications to meet specific operational requirements. These options may include different types of disconnect switch mechanisms, such as manual or electric disconnect switches, to achieve voltage regulation under load. Additionally, the windings of 250kva 0.4kv pad mounted oil immersed transformer can be made of either aluminum or copper. The transformer bushings can also be selected with different configurations based on environmental and electrical requirements, including silicone bushings or ceramic bushings.

For installations in harsh environments, corrosion resistant coatings or weatherproof enclosures can be provided to ensure durability and service life. These customizable specifications enable this transformer to be suitable for various applications, combining flexibility, safety and efficiency. These comprehensive customization features make this 250kva 0.4kv pad mounted oil immersed transformer a highly adaptable, high quality device, which can reduce operating costs and extend service life.

Before leaving the factory, transformers undergo a series of type tests to ensure that each one is safe and reliable. At the same time, we offer guidance services ranging from transformer selection to installation.

250kva 0 4kv Pad Mounted Oil Immersed Transformer

Technical parameter:

Product Name	250kva 0.4kv pad mounted oil immersed transformer
Rated Capacity	250 kVA
High Voltage Side	6kV / 10kV / 11kV / 33kV (customizable)
Low Voltage Side	0.4kV
Method of connecting wire	Three phase four wire system
Tapping Range	±5% or ±2×2.5%
Connection Vector Group	Dyn11 or Yyn0 (Dyn11 is the mainstream choice)
Impedance Voltage	4% to 4.5%
Cooling Method	ONAN (Oil Natural Air Natural)
Frequency	50/60 Hz
open circuit losses	≤400 W
load loss	≤3200 W

Product Features:

1. Fully Sealed Structure

The 250kva 0.4kv pad mounted oil immersed transformer adopts a corrugated oil tank or a plate type radiator structure. The oil tank can freely expand and contract with the change in the volume of transformer oil, effectively isolating the external air and preventing deterioration of the oil quality and insulation from moisture.

2. Safety Design

• Fully insulated and fully shielded: The high voltage side uses a 200A plug in type connector, with no exposed live parts.

• Built in protection: Integrated load switch and fuse, featuring overload and short circuit protection functions.

3. High quality core materials

• Core: Utilizes high permeability cold rolled oriented silicon steel sheets (CRGO), which reduces hysteresis loss and eddy current loss, resulting in low noise generated by the 250kva 0.4kv pad mounted oil immersed transformer during operation .

• Winding: Made by winding with oxygen free copper wire or aluminum wire, it has high mechanical strength and strong anti short circuit capability.

4. Environmental Adaptability

• Protection Level: Achieves IP65 (dust and water resistance), enabling stable operation in harsh outdoor conditions.

• Anti corrosion treatment: The surface of the fuel tank is phosphated and coated with a three layer protection layer (anti humidity, anti mildew, anti salt fog), which extends the service life of 250kva 0.4kv pad mounted oil immersed transformer.

• Environmental protection option: FR3 plant based insulating oil can be selected. It is biodegradable and has a higher ignition point.