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Distribution transformerS9-M series hermetically sealed oil-immersed distribution transformer of class 6-10kV with dual-wind
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It is suitable for power systems of AC50Hz and rated working voltage up to and including 10kV, can be used as distribution transformer for enterprises of petroleum, metallurgy, chemical industry, textile industry, light industry, etc.

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
30 750 643 974 400 400
50 795 693 1013 400 400
63 800 665 1050 400 400
80 840 680 1075 400 400
100 775 690 1100 550 550
125 1260 900 1045 550 550
160 1090 720 1140 550 550
200 1180 780 1155 550 550
250 1175 750 1180 550 550
315 1315 890 1240 660 660
400 1330 910 1280 660 660
500 1390 930 1340 660 660
630 1545 1030 1410 820 820
800 1570 1020 1535 820 820
1000 1800 1250 1430 820 820
1250 1910 1130 1650 820 820
1600 2010 1220 1740 820 820
2000 2120 1280 1780 820 820

S9-M-30-2000 / 10 transformer
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
30 6
6.3
6.6
10
10.5
11
±5%
0.4 Dyn11
Yyn11
Yyn0
0.1 0.63/0.60 2.3 4.0 75 295
50 0.13 0.91/0.87 2.0 88 395
63 0.15 1.09/1.04 1.9 95 420
80 0.18 1.31/1.25 1.9 103 480
100 0.20 1.58/1.50 1.8 115 540
125 0.24 1.89/1.80 1.7 130 645
160 0.28 2.31/2.20 1.6 145 740
200 0.34 2.73/2.60 1.5 175 885
250 0.40 3.20/3.05 1.4 195 1010
315 0.48 3.83/3.65 1.4 230 1205
400 0.57 4.52/4.30 1.3 255 1375
500 0.68 5.41/5.15 1.2 285 1620
630 Dyn11 
Yyn0
0.81 6.20 1.1 4.5 350 1960
800 0.98 7.50 1.0 405 2310
1000 1.15 10.30 1.0 490 2690
1250 1.36 12.00 0.9 550 3315
1600 1.64 14.50 0.8 625 3785
ote: load loss values above the oblique line in the table are suitable for products of connection group Dyn11 or Yzn11, and values below are suitable for products of connection group Yyn0. 

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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