GBE SPA  

HV cast resin transformers have reached a high level of reliability thanks to the latest technology. The E2, C2, F1 production can be used with high level of humidity and pollution avoiding all the fire risks, the toxic emissions and any harmful substance and it is in according to EU Regulation No 548/2014, Directive 2009/125/EC. Class E3 (IEC 60076-16) can be guaranteed for special applications, such as offshore installations or wind mill plants, and class C4 (GOST-R 54827-2011) can be guaranteed for extreme climatic conditions, such as -60° C working temperature. The transformers are manufactured with fire-retardant, insulating and self-extinguishing materials, so they are not exposed to all the restrictions normally applied to the flammable machines where there is fire spreading and propagation danger. The entire GBE production is manufactured with galvanized steel work and class F or H insulating materials, for some applications with pre-impregnation with resin. The windings are vacuum encapsulated with epoxy resin or vacuum class H polyester resin impregnated. The transformers can be supplied with protection enclosure according to the required IP. The protection housings can be supplied in pickled or galvanized sheet for outside installation. GBE products are therefore suitable for installation in hospitals, banks, public buildings, residences, tunnels, on boats, subways, offshore and on shore platforms.

GBE has introduced a new line of housings for dry transformers, available in three different types with customized solutions for different indoor and outdoor applications and installations. These types of housing guarantee the desired IP (IP00 – IP54), but also the highest resistance to corrosion and severe weather conditions, such as installations at temperatures below zero and snow load or using the transformer housing in the desert at ambient temperatures above 50°C with sand. Each housing is described in full compliance with regulations, with special attention to every construction detail. Furthermore, specific measures ensure easier and faster maintenance: dismantling panels to view the transformer can be performed by quickly mounting and removing the screws. Last but not least, the housings can be equipped with locked doors and any other accessories required may be provided based on GBE’s vision of providing highly customized products if necessary.

GBE S.p.A. produce cast resin power transformers up to 30 MVA with insulation class up to 52 kV, BIL up to 250 kV, rigidity 95 kV, AN/AF. GBE S.p.A. supplies also special power transformers for converters with 2 or more secondary voltages for different applications. For ambient installations up to - 60°C, the design of GBE power transformers is made with appropriate mechanical and constructive features and special epoxy resin. The technology and the know-how achieved by GBE enable them to manufacture power transformers with very high harmonic content. GBE power transformers have been tested and certified by universally known certification authorities on routine, type and special tests according the standards in force and customer requirements.

GBE S.p.A is specialized in the manufacture of standard and special liquid filled transformers for any kind of application and for special installation. Some of the technical solutions need a highly specialized engineering to guarantee the reliability of the product. GBE Research and Development department not only performs tests on the raw materials, conductors and insulating materials, but also on the mechanical design of the units so to optimize and improve the production process to a high level of industrialization. Thus, the product and the mechanical and electrical features used in the design optimization are standardized and guarantee of precision and quality. All GBE products fully comply with the clients specifications at the highest quality standards, supporting with technical and detailed solutions. Our philosophy is to offer more than required at the highest technological level.

The annual production is about 1,400 units to make a total of more than 1500 MVA. The plant is specialized in the production of oil transformers and reactors for distribution and special applications from 50 kVA up to 5000KVA class 72 kV. This production facility is also equipped with a test room over an area of 300 square meters, and it is fully equipped and certified to perform routine, type and special tests.

The recently built third GBE plant, the fabrication facility, is the result of a significant investment. This plant allows GBE to manufacture not only the highest quality customized products, but also special products according to customer specifications. Moreover, it guarantees GBE maximum flexibility in the production cycle, as it makes it independent from external suppliers and therefore able to operate with short production times.

The 2,500m2 plant is equipped with 10m lifting capacity overhead cranes and flags for the semi-finished products handling. The state of the art equipment and machinery guarantee the production, processing and finishing of all the steelwork used for all the transformers and reactors manufacture. The laser cut machinery is equipped with automatic 10 pallet stack for the metal sheet storage to guarantee a 24/7 working cycle. The plant is equipped with automatic shotblasting machine, which can work on oil tanks for transformers as big as 3.5MVA and with a flow coating painting plant that can guarantee corrosion protection up to C5-M standards. working cycle. The plant is equipped with automatic shotblasting machine, which can work on oil tanks for transformers as big as 3.5MVA and with a flow coating painting plant that can guarantee corrosion protection up to C5-M standards.

All transformers are tested in our test room according IEC 60076 standards. All transformers are delivered with maintenance manual, test report, technical drawing and all necessary certifications. GBE S.p.A. has a test room with very high level equipment. We are able to make all routine tests, without any exception. Our test room is equipped with a special converter 400 A up to 12000V with frequency ranging from 50 Hz up to 400 Hz. Furthermore there is an impulse test device, which guarantees impulse test range up to 1,200,000 V. All our products are manufactured according to ISO 9001:2015, ISO 14001:2015 and 18001:2018. All our products are designed and manufactured according different international standards.

GBE S.p.A. is specialized in the production of air and resin insulated reactors in class F or H and oil-filled reactors for internal and external applications up to 5000 A/52 kV. For external applications, GBE S.p.A is able to supply resin reactors even without a protection box, thanks to the use of resin and special paints, resistant to UV rays.

CURRENT LIMITING REACTORS

•Used to limit fault currents to the values ​​allowed by the protections

•Connected in series to the line

•They are single-phase coils without core

•They can be mounted in a bunk or supplied individually and connected on site

•Sometimes used to also limit the inrush current of the transformers

SHUNT REACTORS

•Compensate for the capacitance of long transmission lines

•Prevent the voltage from rising at the end of the line itself (Ferranti Effect)

SMOOTHING REACTORS

• Connected in series to the DC line

• Allow to reduce a current ripple on the line itself

• They are typically single-phase

• Operation similar to filter reactors with high impedances as the frequency increases

• Difference between filter reactor and smoothing reactor: since the main current is continuous, they suffer  

    less from problems related to additional losses

NEUTRAL FORMING REACTORS

• They have a three-phase core with a winding that is usually zigzag

• Used to create a dummy neutral that can be connected to earth directly or via resistance

• They are connected in a branch to the line

FILTER REACTORS

• Single-phase or three-phase reactors used to reduce the harmonic content in the network or inside systems with high voltage distortions

• Coupled with capacitances (capacitors), both on the LV side and on the MV side