720MVA/550kV main transformer Power plant

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Quick Details

Place of Origin: HeBeiBrand Name:

CNBM

Model Number:

 

Usage:

Power

Phase:

one

Coil Structure:

Toroidal

Coil Number:

2 Winding

Capacity: Rated Voltage:

720MVA/550kV

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 720MVA/550kV main transformer Power plant.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 720MVA/550kV main transformer Power plant. 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 720MVA/550kV main transformer Power plant, 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:What is the transversal and semi-crossing problem of the transformer?
(3) split impedance: two short-circuit between the low-voltage winding impedance, that is, high-voltage winding open circuit, a low-voltage winding short circuit, another low-voltage winding power supply when the equivalent impedance. Where the reactance component is called split reactance.
Q:What is the difference between transformer MVA and KVA?
Are transformers are in power units, like the difference between kilograms and grams, the difference between 1000
Q:What is the critical load of the economic operation of the transformer?
In order to increase the amount of active loss caused by the active loss of the system in the power system, a conversion factor is introduced, that is, the reactive power economic equivalent. Reactive power economic equivalent, is that the power system to send 1kvar reactive power, the power system will increase the number of active power loss kw, the symbol kq, unit kw / kvar. This kq value and the power system capacity, structure and calculation of the specific location and other factors. For the factory substation, reactive power economic equivalent kq = 0.02 ~ 0.15; Kq = 0.05 ~ 0.08; for the three or more transformer factory, take kq = 0.1 ~ 0.15 ~ 0.04; for the two-stage transformer factory, take kq = The
Q:Can dry transformers and distribution cabinets be placed in the same room?
Dry transformers and power distribution cabinets can be placed in the same room. Oil-immersed insulation with insulating oil, dry type with resin insulation, dry-type safety is better than oil-immersed transformers. In the event of a fire or explosion, oil-immersed insulating oil may increase the risk of accidents, so need to be set separately, and the transformer base should have oil leakage design. And dry type change will not have such a danger, it can and power distribution cabinet set in a room, while dry-type transformers and distribution cabinets in the same room easy to overlap, busbar and cable consumption on the reduction, operation and maintenance More convenient, articulated ground and check the power outage when the glance.
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:What are the ways of protecting the transformer?
First, the gas protection: to protect the transformer internal short circuit and oil surface failure. Second, differential protection, current quick-break protection: to protect the transformer winding or lead-out phase of the phase-to-phase short circuit, large ground current system grounding short circuit and winding turn short circuit. Third, over-current protection: to protect the external phase short circuit, and as a gas protection and differential protection (or current quick-break protection) backup protection. Four, zero sequence current protection: protection of large ground current system external single-phase ground short circuit. 5, overload protection: to protect the symmetrical overload, only acting on the signal. Six, over-excitation protection: to protect the transformer over-excitation does not exceed the allowable limit.
Q:What is an isolated ring transformer?
Isolated ring-type transformer is mainly focused on its insulation performance, between the primary and secondary must have a double insulation, so that the isolation of its own high efficiency, effective protection of equipment safety.
Q:How to use the experimental method to determine the transformer iron consumption and copper consumption
No-load test for iron loss; short-circuit test copper loss. I suggest you read the book, see the information.
Q:100kVA transformer can withstand much of the current? What is its formula?
For safety insurance, the current density is about 3.0, S = 144.34 / 3 = 50 (about) So take the 50 square cable can be.
Q:What is the principle of the conversion of the transformer? How to restore the secondary side to the primary side?
1. The principle of the return is the balance of the magnetic potential before and after the countdown. The various energy relations should remain unchanged. 2. Potential and voltage of the count: the transformer once the number of turns W1, the number of turns on the secondary side W2, W1 / W2 = k     There is a return after: E2 '= k * E2                               U2 '= k * U2

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