Vacuum impregnated dry power transformers
- Data Sheet
SG (H) 10 Dry Power Transformer is three Phase no packed (open) Vacuum Impregnation Dry Power Transformer, and high/low voltage windings both adopt the NOMEX paper-covered insulation, with ther processing of H-class non-flux insulation heat resistant paint vacuum pressure impregnation and high temperature curing treatment. The product is manufactured by advanced VPI vacuum pressure impregnation technique. Comparing with the traditional F class Epoxy Resin Pouring Dry Power Transformer, it has great changes in using different insulation materials, design ideas, calculation of electromagnetism / mechanism / temperature rise, structural and production process design. Not limited of above, the heat rating of the insulation, partial discharge measurement, over load capacity and adaptation to the external environment have great improvements. Therefore, it is the upgraded product as the Epoxy Resin Pouring Dry Power Transformer and have been widely used in the center of load for the high requirements of the fireproofing and environmental protection (dust-proof, moisture-proof, anti-dirty), such as high buildings, commercial centers, hotels, residential areas, tourist attractions, theaters, ports, airports, subways, box-type transformer substation and other transmission and distribution system.
ECO design: the product’s high/low voltage windings adopt NOMEX paper as the main insulation material which can keep the excellent electrical performance and mechanical strength. The insulation class reaches to H-C class (Heat resistance temperature 180℃～220℃) and self-extinguishing, and can be operated safely under serious pollution like damp and salt fog., and will not discharge poison gas when it is dissolution above 750℃. The high voltage coil adopts the ring structure, the low voltage coil adopts the foil winding structure, and the cooper can be recycled after the life period which won’t pollute the environment and has no waste of resources. In order to reduce the noise, the flexible silicone rubber components are placed between iron core and coil, iron core and clamping parts, and support parts.
Advanced technology: the high/low voltage coils have the brightness and non-crack surface, strong mechanical strength and dent resistance after processing vacuum pressing impregnation, baking and solidifying process. Also, the high voltage coil adopts the foil winding and using high strength ceramics for supporting, which greatly improve the short-circuit capacity and provide the reliable security of operation.
Enhance the load capacity: due to the thin layer of high/low voltage coil, the product adopts the multi-airway structure/ radial and cellular structure which have good advantages of airiness and heat dissipation, and keep the running temperature is raised low and enhance the load capacity. The product can work safely under 120% load of rate capacity in rush hours.
Cost reduced: compare with epoxy resin pouring transformer, the product has flexible structure, don’t need extra cost on mold process. Even if the requirement is non-standard product, the production period can be reduced more than one week at least.
Perfect product’s configurations: the protective cover and temperature control device can be provided according to the requirement. If needed, the remote monitoring and control system with CPU connection can be provided, which includes wind cooling system, intelligent thermal protection system and monitoring system, and combined as three phase automatic temperature control system.
The information need to be provided as below：
1. Model Type
2. Rated Capacity
3. Phase No.
5. Voltage combination/ Tapping Range
6. Union Symbol
7. Short Circuit Impedance
8. Cooling Method
9. Protection Level of Shell
10. Other Special Requests/ Conditions of Use
Connection Groups Symbol
hort Circuit Impedance