Three Phase Oil Immersed Step up Power Distribution Transformer

• Customization: Available
• Application: Power, Electronic, Instrument
• Phase: Three
• Core: Core-type Transformer
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Two-winding Transformer
• Certification: ISO9001-2000, ISO9001, Ctqc, CE, ISO14001, Cesi
• Usage: Power Transformer, Distribution Transformer
• Frequency Characteristics: Power Frequency
• Brand: Shenda
• Trademark: SHENDA
• Origin: Zhejiang China
• Production Capacity: 8000/Year

Product Description

Specifications
33KV and 66kV series power transf.1) CTQC, ISO9001, ISO14001, CE 2) Apply for IEC, GB, ANSI 3) Up to 230kV, 180MVA




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.

Technologies:

Design: relative developed software are adopted in Electromagnetic calculations, strength analysis, leakage magnetic distribution, its electro-dynamic force and electrical insulation.

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	7	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	8	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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