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  • 33/11kv Series Power Transformer
  • 33/11kv Series Power Transformer

33/11kv Series Power Transformer

Description of 33/11kv Series Power Transformer

Oil immersed power transformer, based on know-how accumulated over decade years in oil immersed distribution transformer field, YUEBIAN’s oil-immersed transformers have been supplied to various industries including semiconductor, steel work, and petrochemical.

Further, as an outstanding and comprehensive oil immersed distribution transformer solution provider, we respond to the oil immersed power transformer demanding requirements of our customers by developing and manufacturing both eco-friendly pole mounted distribution transformer and high-efficiency oil immersed power transformer.

Both oil immersed distribution transformer and pole mounted distribution transformer are designed for power centers, substations and network, also for pad mounted oil immersed power transformer, used in public distribution system, commercial building and industrial complexes

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Phase: three 

Cooling Method: ONAN, ONAF/ OFAF 

Frequency: 50 or 60Hz

Vector Group: Dyn11, Yd11, Ynd11, or others

Capacity Range: 100KVA to 31500KVA

Primary Voltage: 30KV to 38.5KV

Coolers: corrugated wall or radiator

Oil preservation: hermetically sealed or conservator/free breathing

Tap changer: Off-circuit or On-load. 3 steps; 5 steps; 7 steps; 9 steps; 13 steps; 17 steps

Cooling medium: mineral oil

Winding materials: aluminum or copper

Parts: Oil draining valve, Oil level indicator, Thermometer, Gas relay, Pressure relief valve, Earthing terminal, Lifting lugs, Nameplate, Outdoor bushings, etc.

Rating Plate: Yes (YUEBIAN brand or Customer brand)

Execution Standard: IEC 60076, GB1094.1-2018


Features of 33/11kv Series Power Transformer

The three-phase oil-immersed transformer produced by our company adopts a new insulation structure to improve the short-circuit resistance; the iron core is made of high-quality cold-rolled silicon steel sheet; the high-voltage windings are made of high-quality oxygen-free copper wire. It has a multi-layered cylindrical structure; all solid parts are specially secured against loosening.

The product has the characteristics of high efficiency and low loss, which can save a lot of power consumption and running cost, and has significant social benefits. It is a new technology product promoted.


•Unique Welding Process, No Leakage

Eliminate the high and low pressure risers to reduce welds; the fuel tank wall uses wide-width steel plates to reduce joints; a unique welding process to ensure welding quality.

•Groove Structure

All sealing flanges are grooved to ensure sealing performance.

•Control Leakage

All the oil drain valves of the transformer are made of copper valves, and the radiator uses a vacuum butterfly valve to reduce the leakage of the transformer.

•Low Loss, Low Noise

Adopt domestic and foreign advanced technology and equipment, professional research and development. The core adopts high-performance cold-rolled oriented silicon steel sheet and fully automatic robot lamination machine with small shear burr and low lamination coefficient, which effectively reduces the no-load loss, no-load current and noise of the transformer. The no-load loss is 5% to 15% lower than the manual lamination.

•High Reliability

The transformer is equipped with an oil surface thermometer, the top of the fuel tank is equipped with a pressure relief valve with a contact point, the oil level indicator of the oil storage cabinet is an oil level gauge with a contact point, and the high and low pressure casing is an anti-fouling enhanced pure porcelain oil type casing, which can be used for Heavy pollution level environment.

•High Quality Insulated Skeleton Support inside the Coil

The inside of the coil is supported by a high quality insulating skeleton. All coils adopt inner and outer struts, all struts and blocks are chamfered, the electric field is uniform, and the reliability is enhanced. All fasteners on the axial body of the coil are self-locking locknuts, so that the product can withstand long-distance transport bumps without looseness and without the need for a lifting core.


Professional Service of 33/11kv Series Power Transformer

Pre-Sales Service: provide design consulting service in accordance with customer requirements, and provide separate design scheme according to different customer markets to make products more competitive.

After Sales Service:

• We can provide on-site installation instructions, commissioning and after sales service. (Fee-for-service)

• You will get free lifelong technical advice from our highly qualified engineers. This will give you a lot of confidence when buying from our company.

• We guarantee the ongoing supply and preferential prices for spare and wearing parts.

• Our highly qualified team of service technicians are well equipped to keep your transformer operating at high efficience at all times.

Production Process of 33/11kv Series Power Transformer

Specification of 33/11kv Series Power Transformer
Technical Data of 33/11kv Series Power Transformer
KVA     Voltage VECTOR Impedance voltage LOSSES (KW) No-load Current
GROUP (%) (%)
HV LV No-load loss Load loss
(kV) (V)
630 33 3.15 Yd11 6.5 1.04 8.28 1.1
800 35 6.3 1.23 9.9 1
1000 34.5 6.6 1.44 12.15 1
1250 38.5 10.5 1.76 14.67 0.9
1600 11 2.12 17.55 0.8
2000 11.5 2.72 19.35 0.7
2500 3.2 20.7 0.6
3150 7 3.8 24.3 0.56
4000 4.52 28.8 0.56
5000 5.4 33.03 0.48
6300 7.5 6.56 36.9 0.48
8000 9 40.5 0.42
10000 10.88 47.7 0.42
12500 Ynd11 8 12.6 56.7 0.4
16000 15.2 69.3 0.4
20000 18 83.7 0.4
25000 21.28 99 0.32
31500 25.28 118.8 0.32
Send us your detail requirements, we have professional service team to answer you ASAP!

Thank you for your attention on YUEBIAN ELECTRIC!

We offer Oil immersed transformers, Dry type transformers, Compact transformer substations, etc.