Power transformer with three-phase two-winding transformer

High voltage power transformer ratio range from 66KV to 220KV are the main products of SHENDA Electric which have many advantage both on quality and price. All the products has been fully tested and certificated before delivery. Shenda electric is renowned and appreciated by its reliable products performance and integrated servi

Featured Products

High voltage power transformer ratio range from 66KV to 220KV are the main products of SHENDA Electric which have many advantage both on quality and price. All the products has been fully tested and certificated before delivery.

Shenda electric is renowned and appreciated by its reliable products performance and integrated services.

Features:

1) Amount of local discharged: The apparent discharge amount is less than 80pC under 1.5 times of rated voltage;

2) Noise: Products of 63MVA and below is lower than 58 dB (AN);

3) Power loss: no-load loss is 30% lower than that of IEC standard;

4) Reliability: All in-service products have no damages or oil leakage occurred;

Application:

60 ~220 kV power system of power plant, substation, mining enterprise and etc.



Manufacture:

Core: effectively upgrade transformer's no-load performance by below methods:

1) The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany Geoge GmbH automatic shear line with the cut burs controlled within 0.02mm.

2) The silicon sheet fabrication adopts "no-upper yoke lapped' technology and all lapped joints of the silicon sheet are 45 full-miters. The laminated core sheets are integrally pressed and adhered with epoxy resin to make the three leg two-yoke core a strong and flat integral one with good verticality precision, this effectively improves no-load performance and reduces noises.

3) Bracing plates are used as support between coil leg and inner coil. The iron yoke is tied with epoxy resin-impregnated glass fiber band, and the lower section of oil tank is tightened with counter-pressure bolts. The upper iron and the upper section of oil tank are fixed at three locations. Hence the body inside the oil tank can withstand the vibration during transportation without any shift.

Winding:

1) The high-voltage (HV) coil adopts an interleaved-continuous structure to improve the voltage characteristics under impact voltage and make voltage evenly distributed. All stays and pads are chamfered to keep highly reliable insulation.

2) In the transformer winding there is a zigzag oil guide structure so as to fully cool all areas inside the winding, lower the temperature rise of the winding and the hot points of the winding and prolong the service life of insulation. The HV and MV regulation system are independently provided with voltage-regulating winding to balance the ampere turn of each winding, effectively lower the axial electrodynamic force generated at short-circuit of transformer and improve abrupt short-circuit withstanding capacity.

3) The winding adopts radial "0" margin designed, between the core and the paper sleeve of LV winding, and between the LV, HV, voltage-regulating windings, as well as before insertion of stays and shroud plate they are fully dried and tightly matched to ensure extremely good compactness and concentricity of the entire winding.

Oil tank and accessories

1) The tank wall adopts wide steel sheet, which will be folded into corrugated structure without splicing, in this way welds are decreased and mechanical strength is enhanced, meanwhile, the corrugated wall has diverging effect, and thus plays a role in decrease of noise. The routing troughs and control cabinets of the secondary circuit are all made of stainless steel, so the entire transformer has a simple and good looking.

2) All sealing surface use quality sealing material and are precision-machined.

3) On the edge of the tank there are double sealing grooves, and the outer sealing material is used to shade the atmosphere and ultra-ray to protect the inner sealing being damaged, thus at utmost prolonging service life and enhancing reliability of the seal.

Rated power (kVA)  H.V  (kV)  H.V. Tap range  L.V  (kV)  Vector Group  Impedance  (%)  No-load Loss    (kW) On-load Loss   (kW)  No-load Current (%)   Oil Weight (kg) Total weight (kg)   Overall dimension (mm)
 800  35/38.5    ±3*2.5%  6.3  Yd11  or  YNd11  6.5  1.06  9.98  1.05  1650  4790  2870*1810*2570
 1000   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11    6.5  1.26  12.16  1  1760  5210  3150*1890*2650
 1250   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11   6.5 1.49  14.63   0.9  2010  6080  3510*2040*2690
 1600   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11   6.5  1.8  17.58  0.85  1920  6610 3560*2070*2740 
 2000   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11   6.5  2.3  19.24  0.8  2160  7440  3680*2050*2850
 2500   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11  6.5    2.72  20.64  0.8  2580  8240  3780*2220*2890
 3150   35/38.5   ±3*2.5%    6.3   Yd11  or  YNd11  7  3.23  24.71  0.72  2680  8540  3850*2310*2950
 4000   35/38.5   ±3*2.5%  6.6   Yd11  or  YNd11  3.87  29.16  0.72  2960  11180  4120*2380*3150
 5000   35/38.5   ±3*2.5%  10   Yd11  or  YNd11  7  4.64  34.2  0.68  3050  12480  4210*2510*3220
 6300   35/38.5   ±3*2.5%  10.5   Yd11  or  YNd11  7.5  5.63  36.77  0.68  4050  15900  4320*3000*3290
 8000   35/38.5   ±3*2.5%  11  Yd11  or  YNd11  7.5   7.87  40.61  0.6  4200  17130  4500*3100*3680
 10000   35/38.5   ±3*2.5%     11   Yd11  or  YNd11  7.5  9.28  48.05  0.6  7480  25230 4560*3500*3750 
 12500   35/38.5   ±3*2.5%    11   Yd11  or  YNd11  8  10.94  56.86  0.56  8010  27000  4590*3580*3830
 16000   35/38.5   ±3*2.5%    11   Yd11  or  YNd11  13.17  70.32  0.54  8560  32500  4650*3700*4000
 20000   35/38.5   ±3*2.5%    11   Yd11  or  YNd11  8  15.57  82.78 0.54   10030  37770  5200*4200*4280
 25000   35/38.5   ±3*2.5%    11   Yd11  or  YNd11 8  18.96  101.65  0.5  12300  42600  5320*4350*4340
 31500    35/38.5   ±3*2.5%   11    Yd11  or  YNd11   8  22  119.7 0.45   13500 51100   5450*4420*4450
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