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Distribution transformerSZ9 series hermetically sealed oil-immersed distribution transformer of class 6-10kV with dual-windi
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 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
200 1650 870 1340 550 550
250 1700 880 1490 550 550
315 1750 900 1560 660 660
400 1800 1060 1600 660 660
500 1830 1080 1660 660 660
630 1950 1120 1690 820 820
800 2270 1240 1840 820 820
1000 2310 1400 1900 820 820
1250 2360 1460 1940 820 820
1600 2430 1510 1990 820 820

SZ9-200 ~ 1600/10 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 
200 6
6.3
6.6
10
±4×2.5%
0.4 Yyn0
Dyn11
0.48 3.06 1.5 4.0 260 1040
250 0.56 3.60 1.4 290 1160
315 0.67 4.32 1.4 320 1360
400 0.80 5.22 1.3 350 1550
500 0.96 6.21 1.2 400 1820
630 1.20 7.65 1.1 4.5 490 2170
800 1.40 9.36 1.0 600 2590
1000 1.70 10.98 1.0 710 3000
1250 1.95 13.05 0.9 820 3630
1600 2.40 15.57 0.8 840 4145

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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