260MVA/800kV single phase water cooling main transformer for the hydro power station

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Quick Details

Place of Origin: HeBeiBrand Name:

CNBM

Model Number:

 

Usage:

Power

Phase: singleCoil Structure:

Toroidal

Coil Number: Capacity: Rated Voltage:

260MVA/800kV

Connection Symbol:

YNd11 Dyn11 YNyn0d11

Tank:

Cover type or Bell type

OLTC:

MR or ABB or SMS

Packaging & Delivery

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

Specifications

 

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

 

 Description

 

The application of the 260MVA/800kV single phase water cooling main transformer for the hydro power station.can significantly improve the economy of the OLTC substation, 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 470-490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for the 260MVA/800kV single phase water cooling main transformer for the hydro power station. 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 OLTCtransformer 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 OLTC Transformer’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 260MVA/800kV single phase water cooling main transformer for the hydro power station, 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 OLTCconstruction 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 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:Inverter with transformer and transformer without the difference
Specific differences: 1 inverter in the transformer is mainly from the role of pressure, is to make the power can be issued directly to the low-voltage power grid. Single-phase transformer is the transformer to 230V or so, slightly higher than the electricity single-phase power; three-phase change to about 400V, is also slightly higher than the electricity three-phase power 2 some transformers in addition to the role of isolation and isolation, the inverter is dependent on IGBT power devices to inverter, these power devices will produce more 3 harmonics and 3 times the number of harmonics, these harmonics on the grid Pollution is more serious, plus the isolation transformer (once for the triangular connection, the second star connection) can effectively filter 3 times 3 times the harmonic. 3 from the role of isolation is the abnormal situation when the grid will not put the inverter's important components burned. 4 plus the transformer certainly higher prices, the other weight increases, the efficiency will be slightly reduced.
Q:How to understand the secondary side of the transformer
The 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 (a test), the rest of the winding called secondary (secondary side). The basic principle of the transformer is the principle of electromagnetic induction, now single-phase double-winding transformer as an example to illustrate its basic working principle: When the primary winding with voltage U1, the current I1 flow, in the core to produce alternating magnetic flux , These magnetic flux known as the main flux, in its role, both sides of the winding were induced potential E1, E2. Transformer two sets of coil turns are N1 and N2, N1 for the primary, N2 for the secondary. In the primary coil plus an AC voltage, the secondary coil will produce both ends of the induced electromotive force. When N2> N1, its induction The electromotive force is higher than the primary voltage. This transformer is called a step-up transformer: when N2 N2, U1> U2, the transformer is a step-down transformer, otherwise it is a step-up transformer.
Q:From the variable ratio to determine whether the transformer is boost or buck
110 / 11KV is a step-down transformer. 110 / 10.5KV is a step-down transformer. 121 / 10.5KV is a step-up transformer. Consider the line pressure drop, the state provides a transformer primary winding rated voltage and secondary winding rated voltage.
Q:Transformer charging
In the power plant, substation and other power systems, new equipment, after the repair of equipment or fault handling of the engine, cable, bus, transformers, switches, etc., must first bring the voltage charge, no problems and then put the load on demand.
Q:Altium designer DXP transformer in the same name how to change?
The same name is a painting of about 2-3mil radius of the solid circle, can not directly change, must be copied from the source file to the schematic library file can be changed, that is, to re-create schematic symbols.
Q:Why the provisions of the maximum temperature of the provisions of the transformer 65 °?
Transformers and other electrical equipment temperature limit is determined by the level of insulation materials. Insulation grade refers to the heat resistance of the insulation material used, divided into A, E, B, F, H grade. Allowable temperature rise is the limit of the temperature of the electrical equipment compared to the ambient temperature. Insulation temperature class A grade E grade B grade F grade H grade Maximum permissible temperature (° C) 105 120 130 155 180 Winding temperature limit (K) 60 75 80 100 125 Performance reference temperature (° C) 80 95 100 120 145 In the electrical equipment such as transformers, the insulating material is the weakest link. Insulation material is particularly susceptible to high temperature and accelerated aging and damage. Different insulation materials have different heat resistance, the use of different insulation materials, electrical equipment, the ability to withstand high temperatures are different. So the general electrical equipment is specified in the maximum temperature of its work. You ask the question, the top of the oil temperature does not exceed 65 ℃, is in the case of rated load manufacturers consider a variety of factors to ensure that the insulation material is not damaged by the temperature limit. Under normal circumstances the top of the transformer oil temperature is the highest.
Q:Transformer capacity unit KVA?
The rated value of the output capacity of the transformer in the rated state is expressed in kilowatts (kVA) (VA and MVA are not commonly used). Since the transformer has a high operating efficiency, the original, secondary winding (winding deformation Tester) rated capacity equal to the design value. KV.A is the capacity of the transformer, KVA is the apparent power, its size and power factor. KV and KVA conversion relationship 1 kV (kV) = 1000 V (V) 1 V (V) = 1000 mV (mV) Kilovolts greater than volts greater than millivolts, the rate of 1000. 1 V (V) = 1000000 VV (μv) 1 MV (MV) = 1000000 V (V)
Q:Single-phase and three-phase transformer is what it means
Single-phase transformer, generally refers to the primary coil is a single-phase single-coil design, the secondary can have one or more winding coil, the ideal state of the secondary total power is equal to the total primary power. For example, the common primary power supply low voltage 220 volts, the core made of mouth font, Japanese font, ring, R-shaped. Three-phase transformer, the general primary three windings, the connection is divided into triangular and star, Yanbian triangle, etc., the three winding voltage phase difference between 120 degrees, which is the common three-phase 380-volt wiring, the core The traditional three-phase three-core column, three-phase five-pin column, involute and other forms. In fact, there are many substation large-scale three-phase transformer, in order to transport and installation convenience, but also for good heat dissipation, there are three separate single-phase transformer, the use of traditional triangular or star connection input, equivalent to a Three-phase transformer.
Q:What is a transformer?
First talk about the buck, usually we use a variety of voltage, such as life lighting is 220V, industrial safety lighting is 36V, welding machine voltage also need to be adjusted, which are inseparable from the transformer, the transformer through the main and auxiliary coil electromagnetic Mutual inductance principle, can reduce the voltage to the voltage we need. In the process of long-distance voltage transmission, we need to raise the voltage to a high, in order to reduce the voltage loss, usually rising to several thousand volts or even tens of kilovolts, which is the role of the transformer.

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