Industrial thyristor controlled transformer rectifiers

Jon Lawson

Powerstax announces the introduction its new Drake TR Series of Industrial Thyristor Controlled Transformer Rectifiers. Available with outputs up to 750kVA this new range of Transformer Rectifiers uses analogue or digitally controlled thyristors to achieve the required voltage and current profile with switched-mode technology available for smaller systems. Standard TR Series systems meet IP54 and they can be air, oil or water cooled and sealed to IP65 using purge and pressure techniques for ATEX Zone 1 and 2 areas.

Typical applications for the Drake TR series include water treatment, electrochlorination, surface finishing, cathodic protection and anti-fouling, electrophoretic processes, aircraft ground support, marine and offshore and engine starting.

Key design features include thyristor control, 415VAC 3-Phase input, <1% output stability, <5% output ripple, Short circuit protection, Integral fan cooling, Remote control and monitoring options, top or bottom cable entry options, analogue or digital voltage and  current display. Operational safety is ensured by a door isolator, input main contactor and emergency stop push button. Status indicators show supply-on, DC-Live and rectifier fault and overload is protected by input thermal overload contactor and self-limiting electronic current control backed-up with high speed semiconductor fuses.

Standard products are available over the range 15V@1500A, 30V@2000A, 60V@3000A, 75V@1000A, 150V@1200 and 400V@500A. Output voltage can be adjusted from 0V to full voltage when in voltage control mode and output current can be adjusted from 0A to full current when in current control mode. Remote control may be specified as an option using isolated input signals from a remote computer source and isolated signal transformers can be fitted to provide remote feedback of output current and voltage.

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