S11-M Series Hermetically Sealed Oil-immersed Power Transformer of Class 20-10KV with Dual-winding Off-circuit-tap-changing

S11-M Series Hermetically Sealed Oil-immersed Power Transformer of Class 20-10KV with Dual-winding Off-circuit-tap-changing

Our three-phase oil-immersed distribution transformer adopts new type insulation structure for its body that further improves its short-circuit resistant capacity
Product description

Model meaning


Overview & features

Our three-phase oil-immersed distribution transformer adopts new type insulation structure for its body that further improves its short-circuit resistant capacity; its iron core is made of high quality cold-rolled steel sheet; all HV windings are made of oxygen-free copper, and adopt multi-layer barrel type structure; all fasteners have gone through special tightening treatment. 

The product is featured with high efficiency, low loss, it is able to save much electric energy and running cost, has significant social benefits, is a high-new-tech product popularized by the nation.  

Reliable structure 

Depending on mature technologies, we made a lot of improvements on the basis of traditional structure: 

◎ Spiral winding with longitudinal oil duct that enjoys good inner heat dissipation; 

◎ Effective support at winding end surface that further improve the short-circuit resistant capacity of winding; 

◎ Adoption of new hoisting structure and body positioning structure that guarantee safety in long-distance transport and in service; 

◎ More unique and reliable structures for your option; 

◎ Adoption of transformers with more excellent performances to improve the technical content. 

Excellent materials 

◎ Because we use oxygen-free copper wires of lower resistivity, which will become smoother and burr-free after a series of surface treatment, so the load loss of our transformer is lower and the electric performance is better.

◎ We use high-quality silicon-steel sheets which are of lower specific loss, so the no-load loss of the transformers is lower.

◎ We use high quality wooden laminating insulation pieces, which won’t split or move even under the influence of short circuit current.

◎ We use thoroughly filtrated transformer oil containing less water, gas or impurities, which makes our transformers work better.

◎ We use high quality rubber sealing material, which can prevent the transformers from aging or leakage effectively.

◎ All raw materials have passed the quality testing, and all the raw material factories have passed the national standard IS09000 inspection.

Good technology and economic performance

Improved from S9 series product, S11 series product reduces the no-load loss by 31%; no-load current by 75-90%; average temperature-rise by 10k; noise level by 3-5 db; and double the products’ service life. Even under 20% overloads, it can also work for a long period of time.

Hermetically sealed

The “M” in S11 (M) stands for omniseal structure that the oil tank employed. Compared with common oil-immersed transformer, omniseal oil-immersed transformer discards the oil conservator but adopts wing-like corrugation for replacing oil tube as component of heat dispersion. The corrugated oil tank which is made of high-quality cold-rolled sheets is produced on the special production lines. The wing-like corrugation will expand and compress as that the volume of transformer dose, so that the transformer is separated from the atmosphere and can prevent or slower deterioration of oil and breathing of insulation. All these ensure the reliability of operation and without maintenance.

After the treatment of deoiling, derusting and parkerizing, the surface of corrugated oil tank is coated with paint which provides three-proofing function. It is suitable for the use in the environment such as metallurgy, petrochemical industry and mining, etc.


Service conditions

● Installation height: altitude shall not exceed 1000m

● Ambient temperature: -40℃~40℃


Dimension & Schematic

Rated capacityInstallation dimension
(KVA)LWHC1C2
309808701230550550
5010109001280550550
6310309201310550550
8010509301370550550
10010709701420550550
12510909901430550550
16011309901470660660
200115010101520660660
250120010801570660660
315121011001620660660
40014209001730660660
50014509201790820820
630155010001950820820
800170010401990820820
1000178011302050820820
1250188012302100820820
1600204013802260820820
200023501180260010701070
250024501220272010701070


Technical parameters

Rated capacity

Voltage

 combination

Connection groupLoss (KW)No-load current Short-circuit impedanceWeight (kg)
kVAHV kVHigh-voltage tapping rangeLV kVsymbolNo-loadOn-load%%Oil weightGross weight
3020/10±5×2.5%
       ±2×2.5%
0.4Dyn110.090.662.15.5260640
500.130.962.0280720
630.151.1451.9290760
800.181.371.8310830
1000.21.651.6330920
1250.241.981.5340990
1600.292.421.43601090
2000.332.861.33901230
2500.43.351.24301380
3150.484.011.14701610
4000.574.731.05001740
5000.685.661.05401960
6300.816.820.96.06602500
8000.988.250.87402900
10001.1511.330.78203310
12501.3513.20.78903780
16001.6315.950.610004500
20001.9519.140.610605180
25002.3422.220.511305850

Note: 1. High-voltage tapping range of ±5×2.5% or ±2×2.5% is available on request. 
2. Performance parameters of other capacity specifications can be determined by both users and manufacturer through negotiation. 

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.

If you the s11-m series hermetically sealed oil-immersed power transformer of class 20-10kv with dual-winding off-circuit-tap-changing caters to your requirement, welcome to buy the high quality equipment made in China from us. As one of the leading manufacturers and suppliers of various industrial electrical products in China, we won't let your down.

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