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BackHome > Products > Distribution transformer
Distribution transformerS9 series oil-immersed distribution transformer of class 35kV with dual-winding off-circuit-tap-chan
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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. 
● Installation height: altitude shall not exceed 1000m
● Ambient temperature: -40℃~40℃
Rated capacity Installation dimension（mm）
kVA L W H C1 C2
50 1140 915 1430 550 550
100 1140 1040 1550 550 550
125 1140 1040 1580 550 550
160 1660 880 1620 660 660
200 1660 890 1650 660 660
250 1660 900 1690 660 660
315 1745 920 1760 660 660
400 1785 1000 1810 660 660
500 1815 1100 1850 820 820
630 1830 1115 1920 820 820
800 1905 1230 1960 820 820
1000 2260 1250 2135 820 820
1250 2415 1320 2165 820 820
1600 2505 1450 2235 820 820

S9-50 ~ 1600/35 transformers
Rated capacity Voltage combination Connection group  Loss (KW) No-load current  Short-circuit impedance  Weight (kg)
kVA HV kV High-voltage tapping range LV kV symbol No-load On-load % % Oil weight Gross weight 
50 35
38.5 		±5%
±2×2.5% 		0.4 Dyn11
Yyn0 		0.21 1.27/1.21 2 6.5 220 610
100 0.29 2.12/2.02 1.8 250 810
125 0.34 2.50/2.38 1.7 255 885
160 0.36 2.97/2.83 1.6 305 1040
200 0.43 3.50/3.33 1.5 403 1400
250 0.51 4.16/3.96 1.4 412 1450
315 0.61 5.01/4.77 1.4 430 1600
400 0.73 6.05/5.76 1.3 460 1700
500 0.86 7.28/6.93 1.2 525 2025
630 1.04 8.28 1.1 580 2315
800 1.23 9.9 1 645 2715
1000 1.44 12.15 1 745 3315
1250 1.76 14.67 0.9 825 3730
1600 2.10 17.55 0.8 955 4420
Note: load loss values above the oblique line in the table are suitable for products of connection group Yd11, and values below are suitable for products of connection group YNd11. 

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.

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