China Electrical Power Transformer manufacturer

S11-M Series Oil Immersed Transformer Three Phase Double Winding 20kv Distribution Transformers

Product Details:
Place of Origin: China
Model Number: S9,S11,S13,S15
Payment & Shipping Terms:
Minimum Order Quantity: 1
Price: 500-30000
Packaging Details: wood
Delivery Time: 15 DAYS
Payment Terms: LC T/T
Supply Ability: 5000 pieces/year
Contact Now

Detail Information

Usage: Power,Distribution Transformer Phase: Three
Frequency: 50/60Hz Rated Capacity: 30-3000kva
Type: Oil Type Immersed Current Transformer Winding Material: Cooper;aluminum
Name: Oil Immersed Distribusion Transformer
High Light:

oil immersed distribution transformer


oil immersed power transformer

Product Description

S11-M Series Oil Immersed Transformer Three Phase Double Winding 20kv Distribution Transformers


Product introduction

S11-33kv oil immersed distribution transformer is widely used in industrial and mining enterprises, agriculture and civil buildings, and it’s also suitable for places with many oil and chemical substances in petroleum and chemical industries. The low-voltage winding with the capacity of 630 ~ 2000kVA adopts the tubular or spiral structure, with high mechanical strength, balanced ampere turn distribution and good short-circuit resistance. The positioning structure is added to the transformer body to avoid displacement during transportation. At the same time, all fasteners are equipped with fastening nuts to ensure that the fasteners won’t loose during long-term operation of the product. The product is free of maintenance and long-term operation.



Structural Features


1. Iron core

Is made of high-quality grain oriented cold-rolled silicon steel sheet, with full oblique and holeless binding structure. The iron core is of multi-stage stepped shape, with three or five joints, low loss and low noise. The rolled iron core is directly wound by special equipment, without joints and angle weight, reducing magnetic resistance and low loss. The amorphous alloy transformer core is a new kind of higher quality iron core material, with an average drop of 72% for low air loss and 50% for no-load current compared with the traditional silicon steel sheet.

2. Coil

It is made of high-quality QQ acetal enamelled round copper wire and flat copper coin drawn by oxygen-free copper rod. Coil forms include cylinder type, continuous type, new spiral type, split type, etc with sufficient electrical strength, mechanical strength and heat dissipation capacity. In order to increase the short-circuit resistance of transformer, higher quality self-adhesive transposed conductor can be used. The coil is made of self-adhesive acetal enamelled flat wire. After being wound into a coil, the enamelled flat wires are mutually bonded to form a rigid coil, which can withstand greater bending stress, thus enhancing the short-circuit resistance of the transformer. The biggest characteristic of the self-adhesive transposed conductor is that it can reduce the loss of the transformer. The multi-split conductor and transposition can greatly reduce the eddy current loss and circulation loss, reducing the temperature rise of the hot spot of the winding, and make the temperature distribution of the whole winding more evenly.

3. Oil tank

It is welded by high-quality steel plates elliptical or rectangular structures. The radiator elements are chip type radiator, expansion radiator or corrugated oil tank. The oil tank sealing is tested reliably in the factory. It is sprayed with three times of primer and one time of finish paint inside and outside. The product is salt fog proof, damp heat proof and fungus proof, which can meet the special requirements of metallurgy, petrochemical system and wet and polluted areas. It is beautiful in appearance and reliable in operation.


S11-M Series Oil Immersed Transformer Three Phase Double Winding 20kv Distribution Transformers 0


· Service conditions

1. The maximum ambient air temperature shall not exceed 40 ℃, and the minimum shall not below - 25 ℃;

2. The altitude shall not exceed 1000m. If special customized transformers and low-voltage components are used, the altitude can reach 4000m;

3. The vertical inclination is no more than 5 °, and no violent vibration and impact;

4. The air humidity is not more than 90% (+ 25 ℃);

5. No gas and conductive dust that will seriously affect the insulation of transformer, no explosion hazard and corrosion of electrical components;

6. Outdoor wind speed shall not exceed 35m / s.

If service conditions beyond the above, specially customized product is available



Note: Due to continuous product improvement, the dimensions provided in this sample are for reference only. If necessary, our company can design and produce according to user requirements. Please contact the company in time.



Main technical parameters
Main circuit rated voltage(V) .......................... Ac 400 (600)
Rated voltage of auxiliary circuit (V) .......................... Ac 220/380 (400) dc 110/220
Rated frequency (Hz) .......................... 50(60)
Rated insulation voltage(V) .......................... 690(1000)
Rated current(A) The level of bus ≤6000
Rated short-time bus withstand current (kA/1s) .......................... 50,80
Rated peak withstand current of bus (kA/0.1s) .......................... 105,176


Power frequency test voltage (V/1min)

main circuit 2500
Auxiliary circuit 1760



Three-phase four-wire system A,B,C,PEN
Three-phase five-wire system A,B,C,PE,N
Protection grade .......................... IP30



Company introduction

Qingdao Hengfengyou group specializes in the development research, manufacturing and service of power transformers for 30 years. At present, the company has 10 senior engineers, 30 senior technicians, more than 200 employees, with an annual output value of 50 million US dollars and an annual production capacity of more than 10 million kVA. Hengfengyou is a large-scale enterprise in the field of power transmission and distribution equipment manufacturing. With high-quality products and perfect service system, It now provides reliable power transformer products and services for more than 50 countries and regions around the world. It has established a good reputation and image of "HFY" brand in the global market, and won extensive trust and praise from customers.


Our company research and development production of S11 - M series fully enclosed oil-immersed power transformer has the advantages of low loss, low noise, high efficiency, can obtain good energy saving effect and reduce pollution. Totally enclosed compared with ordinary oil-immersed transformer, cancelled the oil storage tank, the oil volume change by corrugated tank elastic corrugated chips to automatically adjust the compensation, transformer isolated from the rest of the air, to prevent and slow the deterioration of oil and insulation aging, improve operational reliability, running free maintenance.


· Order instructions:

1. The customer needs provide main parameters of the transformer (input and output voltage, capacity, loss, etc.)

2. Other customer requirements


S11-M Series Oil Immersed Transformer Three Phase Double Winding 20kv Distribution Transformers 1


S11-M Series Oil Immersed Transformer Three Phase Double Winding 20kv Distribution Transformers 2

Get in touch with us

Enter Your Message

You Might Be Into These