S9 Series Oil-immersed Power Transformer of Class 35kV with Dual-winding Off-circuit-tap-changing

S9 Series Oil-immersed Power Transformer of Class 35kV with Dual-winding Off-circuit-tap-changing

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

Model meaning


Overview & features

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

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. 


Service conditions

● Installation height: altitude shall not exceed 1000m

● Ambient temperature: -40℃~40℃


Dimension & Schematic

Rated capacityInstallation dimension(mm)
kVALWHC1C2
800214013202120820820
1000240013302170820820
1250247013502190820820
1600255013752250820820
200027001400230010701070
250025202300236510701070
315026002350241010701070
400026802560249010701070
500027302750255010701070
630029602800308014751475
800031702610321014751475
1000032503220340014751475
1250033703260354014751475
1600034703280358014751475
2000039503450385014751475
2500045703800390014751475
3150050004150400014751475


Technical parameters

Rated capacityVoltage combinationConnection groupLoss (KW)No-load current Short-circuit impedanceWeight (kg)
kVAHV kVHigh-voltage tapping rangeLV kV symbolNo-loadOn-load%%Oil weightGross weight
80035
       38.5
±5%
       ±2×2.5%
3.15
       6.3
       10.5
Yd111.239.901.06.57903040
10001.4412.151.08503410
12501.7614.670.99503890
16002.1217.550.810604620
20002.7219.350.711955345
25003.2020.700.612855960
31503.8024.300.56714706695
40004.5228.800.5617608350
50005.4033.030.4818509400
63006.5636.900.487.5220011300
8000YNd119.0040.500.42245013240
1000010.8847.700.42323016600
1250012.6056.700.408358519400
1600015.2069.300.40442023100
2000018.0083.700.40606029700
2500021.2899.000.32649038200
3150025.28118.800.32689040300

Order guide

Please specify the product model, rated capacity, HV/LV rated voltage and high-voltage tapping range, phase number, frequency, connection group symbol and so on in the order.

If you the s9 series oil-immersed power transformer of class 35kv with dual-winding off-circuit-tap-changing caters to your requirement, welcome to buy the high quality equipment made in China from us. As one of the leading manufacturers and suppliers of various industrial electrical products in China, we won't let your down.

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