19/4/13 - Expansion of the product portfolio
Let us introduce you the expansion of the product portfolio of our company about transformers of brand ABB. |
» KGC Mostek, Czech Republic
» Palmovka Park II, Czech Republic
» Metaldyne Oslavany, Czech Republic
» Areal ÚJV Řež, Czech Republic
» AGC, Czech Republic
» PPP Ucea de Sus, Romania
» Adularya Enerji - Yunus Emre, Turkey
» Bauhaus Plzeň, Czech Republic
More than 50 years of experience with manufacturing of transformers provides us with an assurance of quality and reliability, which guarantees success with our customers.
OTN, OTR, and OTF series transformers are powerful oil-immersion transformers for use in the energy, industrial, and transportation sectors. Transformers are designed per customer requirements, in terms of electrical parameters and dimensions, based on international standards.
The transformer has to be adapted to the installation requirements in large industrial applications. The electrical parameters, and often the dimensions as well, should be defined to respect various restrictions. SEA complies with such needs with the OTN, OTR and OTF oil transformers and through its Engineering Department equipped with the latest tools and lifelong production experience it supplies customers with machines to suit their needs.
Design
Our designers? experience combined with the best calculation tools provided by modern technology enable our Engineering Department to design every type of transformer in detail. By using the latest generation of 3D CAD we can study and view the machine long before manufacturing it. We can carry out computerized tests on the finished elements to accurately verify the performance of some electric or structural parts considered as critical (Finite Element Method).
Magnetic core
The core is made of grain-oriented magnetic sheets, featuring high permeability and reduced specific losses separated by inorganic insulation (carlite). The special cutting and assembly of the core form ?STEPLAP? joints which reduce noise as well as losses and no load current. Magnetic sheets are pressed by robust core clamps and glass fiber or plastic tape bondings, free from bolts feeding through the magnetic core to further reduce losses and avoid hot spots. Suitable axial ducts are provided when necessary in order to obtain a uniform temperature field.
Voltage distribution
|
Electric Field Strength
|
The LV winding is generally made of a copper or aluminium conductor. The type, shape and winding strictly depend on the current and voltage involved and are selected periodically. The ?transposed conductors-cable with epoxy? is generally used for currents up to some thousands of amperes. It combines excellent mechanic resistance with reduction of losses caused by eddy currents.
Higher currents and special applications require a solid copper bar which from a mechanic point of view allows extremely strong windings and is able to support repeated short circuit stresses (e.g. furnace transformers or for test rooms). For conversion group transformers, secondary winding (LV or MV) can be made of two or more independent sections axially or radially positioned in relation to one another.
HV windings
The HV winding is generally made of a copper or aluminium strip insulated with pure cellulose paper. Once again (as for MV and LV windings) many types of conductors and windings are periodically tested to identify the most suitable one. For voltages higher than 72.5 kV class, the interleaved disc is used to optimize the distribution of steep-front overvoltages.
Tapping and corresponding windings for power and special transformers should be carried out with competence and care since it affects the main final characteristics of the transformer. In detail:
OTN, OTR and OTF transformers have been designed on the basis of experience and a wide range of tests.
For special applications generally dedicated to furnace or AC/DC converters the adjustment may be obtained through an additional transformer or an autotransformer in the same tank.
No Load Tap Changer and On Load Tap Changer
Based on the customer?s needs, transformers with different types of tap changer are available:
No load:
On Load:
The assembly is carried out carefully and accurately. The insulation materials are subject to great dimensional variations based on the tolerances and humidity quantities present in their fibers.
We can guarantee the reliability and sturdiness of our product versus the inevitable electric and electrodynamic stresses occurring within the network, thanks to our experience and the great care we take in assembling the active part.
Windings carefully pressed and dried in an autoclave are mounted on the corresponding leg of the core, then we proceed with the yoke assembly, locking the lid, electrical connections and a new cycle of thermal treatments.
Before inserting them into the tank, all transformers are checked to test connections, turn ratio and suitability of vectorial group. In special cases or at the customer?s request we can carry out further tests and measurements on the active part, e.g. record with recurrent low voltage impulses and measurement of the tg- δ of insulation.
Final assembly
After an accurate drying cycle (with verification of the residue humidity) and a final check of the fixing torques, the entire active part is assembled inside the body and then filled with oil in a vacuum. After filling, all accessories provided pursuant to the customer?s specifications are installed on the transformer.
All transformers are tested in our test room with routine tests, type tests and/or special tests based on the customer?s instructions. The customer or the person in charge may be present at the tests on the transformer.
In addition to the regular tests, at our plants we can also carry out the following tests:
Archive of type tests
SEA has a large archive of type and special tests carried out on many power transformers delivered to customers worldwide. The archive is available at all times for our customers to consult.
Standards reference
The SEA OTN, OTR and OTF power transformers comply with the IEC 60076-11 standards and the customer´s requirements.
SEA?s production capability covers most medium-high voltage installations and industrial applications.
Some examples:
SEA can provide turnkey deliveries of transformers worldwide. Thanks to more than 30 years? experience in the shipment sector and to our highly qualified staff, we ship and reassemble on site, agreeing the most suitable shipment arrangement with the customer.
For shipments made to critical sites or at the customer?s request, we can install a sophisticated impact recorder on board our transformers which enables us to monitor the quality of transportation.
For shipments made to critical sites or at the customer?s request, we can install a sophisticated impact recorder on board our transformers which enables us to monitor the quality of transportation.
Copyrigt © 2024 www.power-energo.cz | Power-energo s.r.o., Pod Pekárnami 245/10, 190 00 Praha 9 - Vysočany, IČ: 27456986 | Mapa | Partneři
Naše produkty: Trafostanice | Transformátory | Trafostanice skladem | Rozvaděče | Bioplynové stanice