| Main Specification | |
| Transformer Type | Oil immersed |
| Rated capacity | up to 40MVA |
| Primary voltage |
11, 22, 33, 66, 90, 132 kV or custom specification |
| Secondary voltage |
3.3, 6.6, 11, 33, 66, 132kV or custom specification |
| Frequency | 50 or 60Hz |
| Phase | single phase or three phase |
| Winding material | Copper or Aluminum |
| Tap changer | Off-load or on-load |
| Tapping | ±2 x 2.5 %, ±5% (or different range on request) |
| Insulation class | A（105℃）， E (120℃）, B（130℃） |
| Marine Coating |
C4, C5 |
| Vector group |
Dyn11, YNd1d1, Yyn0, YNd11 etc. |
| Cooling |
ONAN , ONAF, KNAN, KNAF etc. |
| Bushing | ceramic insulators or epoxy resin bushings |
| Tank construction | • Breathing Type with Conservator • Hermetically Sealed Type with corrugated tank •Hermetically Sealed Type with Nitrogen Blanket |
| Insulation level |
11KV BIL 95KV 22KV BIL 150KV 33KV BIL 200KV |
|
Ambient temperature |
-45°C + 60°C |
|
Altitude |
5000M( on request) |
| Dielectric fluids | Mineral oil, Silicone, FR3 Oil, Midel etc. |
| Standard |
IEC, AS, EN, IEEE/ANSI, GOST |
| Accessories |
lifting lugs, oil level gauge, oil filling valve, drain valve, winding temperature indicator, pressure relief valve, Tap changer, oil Thermometer, Buchholz-Relay |
Why choose Varelen oil immersed transformer? Safe and environmental friendly transformers
1. Magnetic Core
The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel lamination insulated on both sides, guaranteeing low losses and low noise. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.
2. Transformer winding
The winding as the centerpiece of the transformer must be especially protected – both against high electrical stress due to external over voltages and against mechanical overloads by short circuits. Huarui transformers are systematically designed to meet these requirements. The windings are made of copper or aluminum. Low-voltage windings are made of strip or flat wire, and the high voltage windings are manufactured from round or profile wire. (“diamond-dotted paper”) bonds the winding into a compact block while drying and increases the short-circuit capacity additionally.
3. Painting and surface treatment
oil Immersed Transformers colour is RAL 7033. Transformer tanks are painted by the method of dipping or spraying. and offer anti-corrosion paint C5, also can supply (zinc coating) according to the customer requirements. tried-and-tested surfact treatment depending on the application environment and transformer installation site.
The Tank
The tank, cover and conservator are made of steel plates.Double welding is used where oil tightness is required. Rubberor cork rubber compound is used for the gasket on flangedconnections.The transformer tank usually has removableradiators connected by shut-off valves. All tanks are subjected to leak tests.
Areas of applications
Oil immersed Distribution transformers by Varelen used for a wide range of applications.
Varelen has launched online FAT plan for customers. Our factory can make acceptance testing ( either witnessed and on-line) in order to show all technical and quality requirements have been done before shipment.
Routine test
Type test
Special Test
