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Siemens Rectifier / Transformer 500 kA

Zinc electrolysis rectifier group supplied by Siemens consisting of :

1. Transformer 500 kA - power rating 2 x 16.78 MVA, primary voltage 6.3 kV, 50 Hz, secondary voltage 238 V, transformer cooling OFAF, 4 fans, 2 pumps
2. Two rectifiers DC100 kA, 125 V - number of thyristors mounting places 60 / 10 per phase, number of installed thyristors 54 / 9 per phase, thyristor T4301 N22 TOF, control range 85V to 125V DC, phase effect - per rectifier: 6-pulse, per group 12-pulse
3. Four DC – switches Ritter, Germany, type 2 x HCD-AI-D-100, 2 x HCD-AI-D-110, nominal current: 2 units 100 kA, 2 units 110 kA, motor drive 3 x 400V / 50Hz, auxiliary contacts 6 NO; 6 NC
4. Cooling group - cooling capacity 360 kW, type WFAF /water forced air forced/, internal water circuit 65% deionised water, 35% glycol, number of fans - 8 fans on outdoor heat exchanger, 2 coolers, conservator, cooling block group with pumps, heat exchanger with fans, pipes and consoles for cooling group
5. Control cubicled
6. Overall rectifier control is carried out with a Simatic S7-300 PLC, with a CPU317-2DP, as
central unit

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