• Sourcing Solutions
  • Services & Membership
  • Help & Community

Quick Details

  • Place of Origin: Beijing, China (Mainland)
  • Brand Name: Daelim
  • Model Number: S(F)SZ9
  • Usage: Electronic
  • Phase: Three
  • Coil Structure: Toroidal
  • Coil Number: Three winding
  • Product name: 220kv Three-phase Three Winding On-Load-Tap-Changing Power Transformer
  • Cooling syestem: ONAN/ONAF
  • Type: Three Phase
  • Material: Copper
  • Rated power: 31500kva
  • Input voltage: 220kv
  • Output voltage: 6.3kv
  • Connection symbol: YNd11
  • Frequency: 60Hz
  • Standard: IEC

Packaging & Delivery

Packaging Details International standard package or As client's request.
Delivery Time 120 days after confirm the drawing

220kv Three-phase Three Winding On-Load-Tap-Changing Power Transformer


220kV Transformer



Amount of local discharge: The apparent discharge amount under 1.5 times of rated voltage is less than 80pC.

Noise: Product of 63MVA and below is lower than 58dB(AN).

Power loss: no-load loss is. 30% lower than that of IEC standard.

Reliablity: All in-service products have no damages or oil leakage occurred.

Short circuit withstanding: Model SFZ11-50000/132 smoothly passed the short-circuit withstanding test of the national transformer quality supervision and inspection center and also passed Holland "KEMA" quality Control syestem.




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 inulation.

In the transformer winding there is a zigzag il 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 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 burrs controlled within 0.02mm.

The silicon sheet fabrication adopts"no-upeer yoke-lapped" technology and all lapped joints of the silicon sheet are 45 full-miters. The laminated core sheet 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 noise.

Oil tank and accessories

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 troughts and control cabinets of the secondary circuit are all made of stainless steel, so the entire transformer has a simple and good looking.

All sealing surfaces use quality sealing material and are precision-machined.


Main Technical Parameters for three-phace two winding on-load-tap-changing power transformer
No-load loss(KW) On-load loss(KW)No load
31500330 220


Our Other Products



Packaging & Shipping

Our mode of transport

we are your best business partner.


International standard package,proper for any special customer air or sea requirements,one set one case or as client's request.


Our Services

Trade Shows

Meeting with our client

Our turnover in the past few months




Company Information

Beijing Daelim Green EP Tech Co., Ltd.


Beijing Daelim Green EP Tech Co., Ltd. is mainly engaged in the import & export of electric products and equipment. Our business team has more than 15 years' foreign business experience, and also has a unique understanding of electrical products and overseas markets. We have established and extended business relationships with customers and partners in Southeast Asia, the Middle East, Europe, Africa, North America and South America.


The main products and equipment we are dealing with: power transformer, current transformer, potential transformer, vacuum & SF6 circuit breaker, load break switch, disconnector, switchgear panel, power plant, transmission line equipment.

We provide competitive prices, high quality products, timely shipment and efficient services to develop our cooperation with all of our customers. We are trading in accordance with international traditions and practices. We would like to extend business with our customers and partners on the basis of cooperation and mutual benefit..

Connect Information






Transaction History of the Supplier

Below is the information about the supplier's transactions conducted via Alibaba.com. If you require further details regarding the transaction data, please contact the supplier directly.

Transaction Overview


Transaction Details

This supplier has completedtransactions with buyers from .

Shipping Destination
Transaction Value
Transaction Date
Email to this supplier
Trade Assurance
China (Mainland) | Trading Company
Transaction Level:
Supplier Assessments:
17 Transactions 310,000+
The supplier’s transactions conduted via Alibaba.com in the past 6 months.
The supplier supports Trade Assurance – A free service that protects your orders from payment to delivery.
Supplier's Trade Assurance Limit: US $249,000
Learn More