250KVA 10KV Oil-immersed transformer No Excitation

250 kVA, 10 kV oil-immersed transformer in the 10KV Distribution Transformer series. Off-circuit tap-adjustment option listed. Confirm capacity, voltage ratio, winding and insulation materials, tap arrangement, losses, impedance, frequency, environmental conditions, testing and applicable standards against the project specification before ordering.

250kVA、10kV 油浸式变压器，归属10KV配电变压器系列。标注无励磁调压配置。下单前应结合项目技术文件确认容量、电压比、绕组与绝缘材料、调压方式、损耗、阻抗、频率、使用环境、试验范围及适用标准。

Manufacturer-supplied product information: Jiangsu Huayu Electric Co., Ltd.

Product Details

250KVA 10KV Oil Immersed Transformer – Core Outdoor Power Distribution Equipment

 

Most power distribution equipment in the industry suffers from poor voltage adaptability, high losses under load fluctuations, and is prone to insulation aging and leakage in outdoor conditions. Purchasers often face challenges such as cumbersome equipment matching, complex voltage regulation operations, and high long-term maintenance costs. This 250KVA 10KV Oil Immersed Transformer features optimized heat dissipation and sealing structures, allowing for flexible integration with High And Low Voltage Switchgear and Box Type Substations to complete power distribution layouts. Compared to Dry Type Transformers, it offers stronger outdoor tolerance and overload capacity, and is compatible with Combined Photovoltaic Substations and Electric Power Converters for voltage boosting and bucking requirements. The voltage level can be adjusted even when the equipment is not in operation, providing stable output of standard low-voltage power, reducing line losses, and extending the service life of the entire power distribution system. It is widely used in industrial parks, distributed photovoltaic power stations, and urban community power distribution scenarios.

 

This equipment adopts a fully sealed corrugated oil tank structure, with insulating oil isolating water vapor and dust to prevent outdoor leakage faults. The non-excitation voltage regulation structure simplifies the operation process, allowing voltage level switching without the need for professional live-line workers. Compared to dry-type equipment of the same capacity, it has higher heat dissipation efficiency, adapts to short-term overload conditions of photovoltaic power station output fluctuations, and can stably suppress power harmonics when operating in conjunction with an Electric Power Converter. The equipment can be installed independently on a pole or integrated into a Box Type Substation, achieving integrated protection, metering, and power distribution when paired with a complete High and Low Voltage Switchgear. In Combined Photovoltaic Substations, it serves as the core transformer unit, completing the high-voltage grid connection after photovoltaic DC power conversion. The entire unit strictly adheres to international Energy Efficiency standards, with low operating noise and controllable losses. Long-term use can reduce electricity costs. It is compatible with the voltage standards of multiple overseas power grids, meeting the bulk procurement needs of industrial, new energy, and civil infrastructure projects.

 

Product Features

1.Non-excitation offline voltage regulation design; voltage adjustment can be completed even during power outages, ensuring safe and simple operation, and adapting to scenarios with small grid voltage fluctuations.

2.The fully sealed oil-immersed structure isolates air, delaying oil aging. Outdoor installations eliminate the need for frequent insulation replacements, reducing maintenance workload.

 

Usage Tips

1.Voltage adjustment must be performed with the power completely off. After switching gears, retest the DC resistance to ensure stable contact before restoring power.

2.If used with Combined Photovoltaic Substations, periodically monitor the Electric Power Converter output current to prevent long-term overload damage to the windings.

 

FAQ

Q：How to select between the Oil Immersed Transformer and Dry Type Transformer?

A: For outdoor, high-load fluctuation, and budget-constrained applications, prioritize the oil-immersed type. For indoor, enclosed locations with high fire safety standards, choose the dry type. Both can be used with prefabricated substations and high/low voltage switchgear.

 

Q：What is the routine maintenance cycle for the equipment, and what tests are required?

A: Check the oil level and bushing cleanliness every six months; sample and test the insulating oil withstand voltage annually; perform winding DC resistance and insulation resistance tests every two years. Frequent core-lifting maintenance is unnecessary.

 

Q：How is after-sales service guaranteed for overseas orders?

A: The entire unit comes with a standard warranty period, a complete English operation manual and troubleshooting guide, and remote, synchronized guidance from our technical team for installation and commissioning. Core components are kept in stock for rapid replacement.

 

Q：Can it be directly installed into a Box Type Substation for complete system supply?

A: Customized sizes are supported, allowing integration into the substation. It can be paired with a High and Low Voltage Switchgear for integrated delivery of the entire power distribution system, suitable for pre-installed photovoltaic substation projects.