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Dry type transformerSC(B)9 series epoxy resin casting dry-type transformer of class 35kV
  • Product overview
  • Apply
  • Specifications
  • Technical
It can be widely used in locations where have strict fireproof requirements, such as underground mines, oil fields, metros, power plants, schools, hospitals, commercial centers, high-rise buildings and all indoor systems.

Iron
◎ The iron core is made of imported cold-rolled silicon steel sheets with inclined joint structure, core limbs are bound by unidirectional weftless tape of class F. 
◎ Surface of iron core is encapsulated with epoxy resin, which reduces the no-load noise, no-load current and core noise. 
◎ Clamps and fasteners have gone through special surface treatment that further improves the product appearance quality. 

High-voltage winding 
High-voltage winding applies vacuum casting of stuffing epoxy resin which sharply reduces partial discharge capacity and enhances the electric strength of coils. The inside and outside of the winding is buildup with glass fiber grid overlay which strengthens the mechanical robustness of coils and product’s short-circuit withstand capability, the coil will not split forever.

Low-voltage winding 
Low-voltage winding applies foil structure which solves the problem of axial helix angle when winds and make the ampere-turn of winding distribute evenly. Meanwhile, the coils adopt axial cooling duct to improve the heat dissipation. Between the layers of winding, it applies DMD epoxy resin preliminary immersed cloth and makes it whole solidification forming.

Manufacturing process
The coils are wound on high precision winding machine. We adopt foil type winding structure for low-voltage windings. Transformers of larger capacity are equipped with ventilating duct. It is vacuum drying, casting and solidification followed the winding, all processes are operated accord with the technological requirements under strict monitoring and may be regulated as appropriate. The precise manufacturing of casting ensures no bubble or cavity in coil, and gets high quality operation of transformer finally. 

Temperature control and air cooling systems
It adopts crossflow top-blow fan which is featured with low noise, high wind pressure and good looking, etc., it improves the safety and reliability of the operation of transformer.

Protective shell and outgoing bus 
The shell makes further protection for the transformer. For user’s option, the grade of protection has IP20, IP23, etc. Shell materials include cold-rolled steel sheets, stainless steel sheets and so on for option. The low-voltage outgoing adopts standard outgoing bus, side outgoing and top outgoing are available, or design special outgoing modes for users.
● Installation height: altitude shall not exceed 1000m; 
● Waveform of source voltage is approximate to sine wave; 
● Symmetry of multi-phase source voltage: 
   connected voltage of multi-phase transformer should be symmetrical approximately.
● Ambient temperature:
   Max temperature +40℃

   Max daily mean air temperature: +30℃ 
   Max annual mean air temperature: +20℃
   Min air temperature: -30℃ (applicable for indoor transformers)
Rated capacity
Installation dimension(mm)
(kVA)
L
W
H
C1
C2
30
1070
890
1050
660
660
50
1180
890
1050
660
660
63
1220
890
1250
660
660
80
1230
890
1350
660
660
100
1250
900
1500
660
660
160
1540
920
1660
820
820
200
1620
920
1750
820
820
250
1650
940
1800
820
820
315
1670
940
1850
820
820
400
1720
1150
1900
820
820
500
1810
1150
1940
820
1070
630
1850
1150
1990
820
1070
800
1990
1150
2010
820
1070
1000
2020
1150
2040
1070
1070
1250
2080
1150
2120
1070
1070
1600
2130
1150
2320
1070
1070
2000
2180
1150
2480
1070
1070
2500
2200
1150
2600
1070
1070
3150
2580
1320
2610
1070
1070
4000
2680
1320
2650
1070
1070
5000
2890
1350
2680
14750
1070
6300
0980
1700
2800
1475
1070

SC (B) 9-35kV 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(120°)
(%)
(%)
Body weight 
Weight with shell
30
35
38.5
±5%
±2×2.5%
0.4
11
10.5
10.6
3.3
15
Dyn11
Yyn0
Yd11
YNd11

0.35
0.85
2.8
6.0
680
730
50
0.45
1.10
2.8
720
770
63
0.50
1.45
2.6
780 830
80
0.58
1.95
2.5
810
860
100
0.65
2.30
2.4
890
950
125
0.73
2.60
2.3
950
1010
165
0.86
2.90
2.2
100
1060
200
1.00
3.35
2.2
1260
1320
250
1.15
3.85
2.2 1420
1480
315
1.32
4.20
2.0
1730
1790
400
1.55
5.40
2.0
1840
1900
500
1.82
6.65
2.0
2200
2270
630
2.09
7.73
1.8
2630
2700
800
2.45 9.10
1.8
3260
3330
1000
2.72
10.5
1.8
3990
4060
1250
3.18
12.8
1.6
4470
4540
1600
3.64
15.5
1.6
5570
5640
2000
4.72
18.2
1.4
6410
6480
2500
5.00
21.5
1.4
6930
7030

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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