40MVA/220KV startup/standby OLTC transformer

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Place of Origin: HeBeiBrand Name:


Model Number:




Phase: Coil Structure:


Coil Number:

3 Winding

Capacity: Rated Voltage:


Connection Symbol:

YNd11 Dyn11 YNyn0d11


Cover type or Bell type


MR or ABB or SMS

Packaging & Delivery

Packaging Detail:Mainbody --naked Disassembled parts -- crate
Delivery Detail:3 months



1. CESI certificate
2. High short-circuit withstand
3. Low loss, PD and noise
4. CTQC certificate
5. No leakage




The application of the 40MVA/220KV startup/standby OLTC transformer, and matches well with the transmission capacity of OLTC lines, which has wide prospect of application. Because of its large capacity and large volume, the whole transportation weight with nitrogen is about 200-490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for application of the 40MVA/220KV startup/standby OLTC transformer. In order to make the products applicable to any OLTC substation in our country, the state grid of corporation of China set the "A study of easy-transport large capacity OLTC Transformer” as a key scientific research projects, and entrusted BTW to carry out the research.

During the process of research and development, BTW adopted the advanced design technology and modular design, the transformer can be transported disassembly and with advantages of compact core and winding body, less transportation weight and low transportation cost, effectively solves the need of OLTC construction in the transportation restricted areas. By using the most advanced 3D magnetic field calculation software, BTW performed detailed analysis and calculation for the magnetic flux leakage and eddy current loss of the transformer coil, iron core and oil tank steel structures. Besides, by using of the advanced electric field calculation software, BTW performed detailed analysis and calculation of main longitudinal insulation, and mastered the arrangement of the main longitudinal insulation of large capacity OLTC transformer and the control of distribution of winding magnetic flux leakage. All of which make the products with low loss, low noise, small volume, strong anti short circuit ability, no local overheating and other significant advantages, and guarantee the long-term safe and stable operation.

The world's first on-site assembled large capacity OLTCTransformer’s right at the first time once again filled the gap in the field of OLTC transformer research after Chinese transformer industry overcame the difficulty of integral transport of the 40MVA/220KV startup/standby OLTC transformer, which marks BTW has fully occupied the world transformer industry technical peak. The successful development of the product filled the gaps in the domestic technology and met the urgent need of UHV construction application in our country, greatly improved the technical level and manufacturing ability of BTW in terms of OLTC Transformer products.


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Q:Transformer Amorphous Alloy and Silicon Steel Sheet Advantages and Disadvantages
 (3) Amorphous alloys are very sensitive to mechanical stress. Structural design, we must avoid the use of the core as the main bearing structure of the traditional design.   (4) In order to obtain excellent low loss characteristics, the amorphous alloy core sheet must be annealed.
Q:The type of transformer and where the different transformers are used
Q:Transformer sales channels
1. Power supply company tender 2. Cabinet manufacturers 3, the installation company 4, direct customers, to the planning bureau to find, in advance to know which new project 5, design institute, know some late 6. Power supply company front desk, people come to install more late
Q:Transformer short-circuit impedance is big good, or small good? The same capacity, voltage ... solution
Can not simply say big or small good because of the big, in the normal operation of the loss of certain size, in the short circuit. Short-circuit current will be great, less investment protection equipment corresponding to the requirements of the money so much to be more economic comparison Caixing! Can not be generalized, the choice of different transformers, impedance voltage is not the same; national transformer standard series, the general 10KV distribution transformer impedance of more than 5%, 35KV transformer impedance of more than 8%, 110KV transformer impedance In the 10% or so, the greater the capacity, the greater the impedance; transformer impedance increases, you can effectively reduce the size of short-circuit current, so in high voltage, high-capacity transformers, multi-purpose high-impedance or series reactor To reduce the short-circuit current, or some equipment is not a good choice; but the transformer impedance increases, the transformer will increase the volume, material consumption increases, the transformer running loss increases, but also to reduce the transformer secondary voltage, Is the transformer overload, the voltage will quickly decline, in case of short circuit conditions, may cause other equipment, low voltage action; under normal circumstances, or use the standard design of the transformer products, unless the special needs, do not use non-standard products, or in the Transformer side by side, selection, testing, maintenance, replacement will cause additional trouble.
Q:Transformer if the boost and buck current will change?
Completely correct transformer output power = input power x efficiency, However, this refers to the rated voltage and rated current The actual output current of the transformer is determined by the load.
Q:How the transformer is transformer
Transformer (Transformer) is the use of electromagnetic induction to change the principle of AC voltage. Transformer consists of iron core (or core) and coil, the coil has two or more than the winding, which connected to the power supply winding called the primary coil, the rest of the winding called secondary coil. It can transform AC voltage, current and impedance. The simplest core transformer consists of a core made of soft magnetic material and a coil of two turns on the core, as shown in the figure.
Q:Why does the transformer have three lines
Transformer 3 into the line in the red and blue for the line of fire and the zero line (do not have to distinguish), the black line for the ground, if there is no power cord, you can not (empty). General table lamp with a 2-wire power plug, does not introduce the ground. Because the lamp in the circuit, the human body can not touch, not ground is safe.
Q:Can the transformer oil be used as a lubricant?
Can not! Two kinds of oil indicators out of the thousands of miles out! According to you say with the line also do more money to prepare for the machine! Oh! Looking for compressor oil, general 13 # compressor oil and 19 # Compressor oil! 13 with dilute words on the 19 # must be no problem!
Q:Transformer 1KVA can load how much security, how to calculate the formula
Hello there: - ★ 1,1KW single-phase transformer, rated current: Ⅰ = 1000 VA ÷ 220 V = 4.5 A, that is, the apparent current of 4.5 A. - ★ 2,1KW three-phase transformer rated current: Ⅰ = 1000 VA ÷ (1.732 × 380 V) = 1.52 A. Three-phase transformer rated output current, apparent current is 1.52 A.
Q:What is the meaning of auxiliary transformer, sub-variable and box change
During the main transformer failure or overhaul, the auxiliary transformer provides the substation's own electricity. Maintenance of substation lighting, high and low voltage switch action, with the cabinet switch operation, for instrumentation and automatic control system work, sub-change can be box change,

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