Rectifier Power Transformers for Industrial Applications Industrial applications - such as the electrolysis process for aluminium or the chemical processes for zinc, copper and chlorine - require extra large volumes of high quality DC current. Coming from AC power, rectifier power transformers associated to rectifiers supply the required DC currents. With over 35 years of experience supplying rectifier power transformers to more than 80 industrial projects around the world, GE offers reliable rectifier transformers adapted to your specific industrial processes and sites - whether for new plants or refurbishments. GE's power transformer experts work in close cooperation with rectifier suppliers to design the rectifier transformers and the electrical and mechanical interfaces to offer you the most optimised DC current solutions available. A Complete Range that fits Every Customer's Rectifier Two ranges of Grid Solutions' rectifier power transformers answer the needs of all electrolysis processes: • Mainly for zinc, copper, chlorine: 100-500 V DC, and up to 140 kA DC • Mainly for aluminium: 240-1750 V DC, and up to 115 kA DC Rectifier transformers are suitable for connections to all types and technologies of rectifiers: • Bridge (Graetz) or interphase (double - star), simple (6-pulse) or double (12- pulse), with diode or thyristor technology • Regulating (auto) transformers associated with self-saturable reactors, or the rectifier thyristors, for fast tuning response needs for low voltage regulation of the industrial process • Self-saturable reactors and inter-phase transformers are also part of our expertise and supply in rectifier transformer combinations, according to the technology and connection type of the rectifier. GE's designs are based on decades of experience, expert calculations and CAD tools. The company offers rectifier power transformers that are precisely adapted to thermal, mechanical and dielectric constraints. GE's experts validate all design and production phases to ensure suitability to specific harmonics and very high currents in accordance with your project requirements. Our special transformer designs take into account harmonic losses in accordance with IEC 61378 and ANSI standards. For applications with high DC currents and reduced harmonics on the voltage system, series transformers with defined phase shifts between units are supplied and connected to 12 to 96 pulse DC supply systems. Field of Expertise • Electromagnetic compatibility • Reliable thermal behaviour of connections • Limitation and mastery of stray flux effects in active parts, surroundings and external equipment Key Benefits • Tailor-made solutions • Field-proven, high operational reliability • Suitability to very high currents and harmonic levels • Improved power quality • Economical operation solution

Rectifier Power Transformers Mastering the Challenges Combining the most innovative designs and the reliability of its field-proven technology, GE has mastered the challenges for global solutions that fit our customers' specific needs. With our broad technical expertise, we have optimised the design of power transformers and their interfaces with the rectifiers - for economical DC supply operations. Very High Current Levels Electrolytic processes involve very high current levels up to a few hundred kA. For cost optimisation, the number of transformers connected in parallel to supply industrial...

Rectifier Power Transformers Tailor-made Solutions Rectifier transformer from GE combinations can be made in one single tank or two separate tanks. In the single tank solution, all active parts are grouped in one tank. This is an economical solution, offering a reduced footprint and reduced installation work. In the two tank solution, the regulating (auto) transformer with its OLTC and/ or OCTC is in one tank and the rectifier transformer assembly in the other. Regulation Solutions for each Specific Process Need Electrolytic processes require wide regulation ranges and fast and tune voltage regulation....

Industrial Process Aluminium Process Rectiformer connection type_Bridge (Graetz)_ Rectifier transformer connection Y(y0 ) ± □ D (yll) ±o or Y(dll) ±a D (dO ) ± or _Y(yO dll) ± a or D (dO yll) ±_ Regulation and tapping OLTCandOCTC 0 to 100 % voltage regulation range Rangel: 36 kV Range 2: 72.5 kV Range 3: 100 kV Range 4: 123 kV Choice of tapchanger Combined impedance Regulation + Rectifier_10 % to 16%_ Interphase reactors_NO_ Rectiformer number (**) From 4 ( 3+1) to 8(7+1) rectiformers Electrochemical Copper/Chlorine/Zinc process 10 to 60 MVA_ Inter-phase (Star-Star, Double star-star) Intermediary...