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.
The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel laminations insulated on both sides, guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.
The Tank Whether during transport or operation –the tank must be absolutely tight under mechanical stress. Preconditions to achieve this are constructional experience, the most modern calculation methods and high-quality welding work. Special attention is paid to corrosion protection. Pretreatment of the surface is processed by phosphating pickling, contributes to corrosion protection, just like multi-coating with preset drying times for each layer. On request, hot-dip galvanization provides for even better protection.
|Transformer type||Oil-immered type|
|Phases||Thres phases or single phases|
|Capacity||30 - 31500kva (customization is available)|
|Voltage||up to 36kv|
|Oil preservation||Hermetically Sealed/ Conservator/ Free Breathing|
|Tap changer||off-load or on-load|
|Winding material||Aluminum/ copper|
|Coolers||corrugated wall or radiator|
|Cooling mode||ONAN /ONAF|
|Available fluids||Mineral oil / Dimethyl Silicone/ Vegetable Oil|
|Compedence||4% to 8%|
|Losses||according to customers requiements|
|Vector groups||Dyn11, Yyn11 (according to customers requiements)|
Only Focused on transformers, but we offer customized different types of transformers.
+20 years experience R&D team, derived from a 60 years history transformer factory in Changsha city of China.
One of the drafters of Chinese National Standard (for Mining explosion-proof Mobile Substations). Unique designing for customers' convenience,like “Vertically Lifting”.
Varelen Electric Co., Ltd