Product Description

S9 series oil-immersed power transformer of class 35kV with dual-winding off-circuit-tap-changing

APPLICATION
It is applicable for power systems of AC50Hz and rated working voltage 35kV, used as transformation equipment for substations of 35kV.

STRUCTURAL FEATURES 
Iron
The iron core is made of cold-rolled grain-oriented silicon steel sheets with high magnetic conductivity, with inclined joint laminated structure. Section of the core limbs is of multi-class ladder round, with uniform section with that of yoke. 

Winding 
The winding adopts corrugated oil duct with non-dipping process, bound by shrinkable tape; all windings are of concentric coils; taps of HV winding with corresponding tapping voltage shall be led to the tap switch, and the switch shall be installed on the box cover. Power supply must be cut off first when changing the tapping voltage.

Installation of protection device 
●Transformers of all capacity specifications have been equipped with pressure relief valve; 
●Gas relay with alarm and tripping terminals is available on request. 

Oil-temperature measurement device 
●All the transformers are equipped with tube holder for glass-stem thermometer that is set on the top of oil tank, and immersed in oil for about 120±10mm;
●1000~2000kVA transformer is equipped with outdoor signal thermometer;

Transformer oil tank 
●Transformer oil tank is composed of corrugated walls with powder painted surface and reinforced with film. Corrugated cooling fin not only has cooling function, but also has breathing function, the elasticity of corrugated cooling fin make it adapt to the change of oil volume due to change of temperature. So this hermetically sealed transformer does not have oil conservator, which decreases the height of transformer. 
●The transformer adopts vacuum oil-injection technology during encapsulation that thoroughly removes the moisture from transformer, and keeps the transformer oil from contacting the air. This technology also avoid insulation performance reduction or oil aging due to entering of oxygen or moisture, it improves operation reliability of transformer. 
FAQ：
Q 1. what's the payment term?  
A --We accept TT,30% deposit and 70% balance against copy of BL
 
Q 2. how's the delivery time ?
A --Usually it will take about 25 days for production.
 
Q 3. tell me the standard of package?
A --For the small capacity, it use carton, but for big capacity, we should use strong wooden case for protection.
 
Q 4. what kind of material of transformer?
A --We have two types, one 100% copper and the other is copper with aluminum.It depends on your requirement. In fact,those two have no difference if normal work well Only except the long life. Copper is better and dearer than copper with aluminum.
 
Q 5.Could you offer Form A or C/O ?  
A --It totally not a problem. We can prepare relative documents to forgin affairs office or other office to apply for this certificate.
 
Q 6.Would you accept to use our logo ?
A --If you have good quantity,it absolute no problem to do OEM.
 
Q 7.We want to know month capacity.  
A --It depends on which model.For example for servo motor type small capacity , month capacity can reach near 20000pcs   and big capacity near 3000pcs.
 
Q 8.Where is your market?
A --Our products are popular in Russia, Australia,Bangladesh, Indonesia, Pakistan, Africa countries and so on.Some of them are our regular customers and some of them are developing. We hope you can join us and make mutual profits from our cooperation.
 
Q 9.What is the featured products of your company ?
A. Single phase and three phase voltage stabilizers, voltage regulator, distribution transformers, low-voltage switch gear assembly,complete plant equipment etc.
 
Q10. what kind of certificate you have ?
A. Our company already achieve ISO, CCC, and for products, we have CE.