Oil Immersed Transformer

Oil-immersed transformers are a type of power transformer in which the core and windings are immersed in insulating oil. This oil serves multiple purposes, enhancing the performance and longevity of the transformer.

Insulation and Cooling: The primary role of the insulating oil is to provide electrical insulation between the windings and to dissipate heat generated during operation. The oil circulates within the transformer, absorbing heat from the core and windings and transferring it to the outer surface or to external cooling systems.

Types of Insulating Oil: Mineral oil is commonly used due to its good insulating properties and thermal conductivity. However, there are also non-mineral oils like silicone-based or synthetic hydrocarbon oils, which offer better fire resistance and environmental properties.

Transformer Construction: The core and windings in an oil-immersed transformer are typically made from high-grade steel and copper or aluminum, respectively. These components are completely submerged in the insulating oil, housed within a robust, sealed tank.

Safety Features: To manage operational risks, these transformers are equipped with safety features like pressure relief devices, oil level indicators, and Buchholz relays (which detect gas bubbles that could indicate internal faults).

Efficiency and Performance: Oil immersion helps maintain the efficiency of the transformer by reducing winding resistance and core losses. It also allows for more compact designs compared to dry-type transformers, as the oil is a more effective coolant than air.

Maintenance Requirements: Regular maintenance includes oil testing for dielectric strength, moisture content, and the presence of dissolved gases, which can indicate internal faults. The tank, bushings, and other components also require periodic inspections.

Environmental Considerations: Oil leaks and spills are a concern with oil-immersed transformers, requiring careful handling and potential environmental safeguards. The use of biodegradable oils is increasing as a way to mitigate environmental impact.

Application: These transformers are widely used in various applications, including utility, industrial, and commercial power distribution, due to their reliability and high power rating capabilities.

 

 

1.Quality management system GB/T 19001-2016 ISO 9001: 2015

The operation of the whole YAWEI system is strictly controlled and managed. This ensures the quality of products and material in all stages, from receiving customer requests to design, materials, production, installation, testing, packaging, delivery, after-sales, all of which operate under strict and logically linked processes.

 

2.CERTIFICATEOFCOMPLIANCE of UL and CUL

YaWei pad mounted transformer have been evaluated by UL in accordance with the U.S and Canada Standard(s). Our transformer certified by UL based on Canadian standards (CSA standards) .

 

3.Accreditation certificate CE

Standard: EN 60076-1:2011.EN 60076-2:2011EN 60076-14:2013 confirms that YAWEI technical quality meets the requirements of all specific international standards for testing and calibration laboratories. All YAWEI products are fully tested in a qualified testing room before leaving the factory, ensuring stable quality and providing absolute peace of mind for customers.

 

 

Cover complete production line of transformer from winding wire, silicon sheet slitting and rolling, transformer oil tank producing and power transformer R&D,testing, installation and production.

 

Yawei automatic insulation wire wrapping line.Yawei has automatic, horizontal, vertical and manual winding lines comes up to different capacity request.

Winding on the primary and secondary windings has an excellent design structure to help the machine operate effectively.

Yawei transformer oil tank casting workshop. Professional work and team for different mold requirements.

Yawei configuration fin/ radiator producing workshop.

Yawei transformer front cabinet workshop

110kv Three-phase duplex winding power transformer on load changer
Rating (kVA)	Voltage Combined		No Load Loss	Load Loss	No Load current	Short-circuit impendance
Â	HV	LV	Â	Â	Â	Â
6300 kVA	110kV ±8 ×1.25%   115kV ±8 ×1.25%	6.3kv 6.6kv 10.5kv 11kv	10	36	0.8	10.5
8000 kVA	Â	Â	12	45	0.8	Â
10000 kVA	Â	Â	14.2	53	0.74	Â
12500 kVA	Â	Â	16.8	63	0.74	Â
16000 kVA	Â	Â	20.2	77	0.69	Â
20000 kVA	Â	Â	24	93	0.69	Â
25000 kVA	Â	Â	28.4	110	0.64	Â
31500 kVA	Â	Â	33.8	133	0.64	Â
40000 kVA	Â	Â	40.4	156	0.58	Â
50000 kVA	Â	Â	47.8	194	0.58	Â
63000 kVA	Â	Â	56.8	234	0.52	Â

 

110kv Three phase three winding power transformer on load changer
Rating (kVA)	Voltage Combined			No Load Loss	Load Loss	No Load current
Â	HV(kV)	MV(kV)	LV(kV)	Â	Â	Â
6300 kVA	110kv±8 ×1.25%   115kv±8 ×1.25% Â	35kv 37kv 38.5kv	6.3kv 6.6kv 10.5kv 11kv	12	47	0.95
8000 kVA	Â	Â	Â	14.4	56	0.95
10 MVA	Â	Â	Â	17.1	66	0.89
12.5 MVA	Â	Â	Â	20.2	78	0.89
16MVA	Â	Â	Â	24.2	95	0.84
20MVA	Â	Â	Â	28.6	112	0.84
25MVA	Â	Â	Â	33.8	133	0.78
31.5MVA	Â	Â	Â	40.2	157	0.78
40MVA	Â	Â	Â	48.2	189	0.73
50MVA	Â	Â	Â	56.9	225	0.73
63MVA	Â	Â	Â	67.7	270	0.67

http://www.yaweitransformer.com/