High Power SCR Rectifier Systems For Furnace ApplicationsThe high power SCR rectifiers are used for various DC furnace where DC power supply is needed, including all kinds of vacuum resistance furnace, vacuum arc furnace, plasma furnace etc. for melting of Titanium, Zirconium, Niobium and Vanadium, Tungsten, Molybdenum, metals difficult to dissolve, high temperature alloy and alloy steels.   Rectifier Features Robust and Reliable Power to run your 24/7 processes.DC reactors and low ripple availableLatest safety featuresDesign to all types of environments and contamination, design to seismic zone and altitudeRemote monitoring via PLC, all types of PLC's available for ease of interface to customer systemsMicroprocesser based digital controllerOn Load Tap Changer available2mm thick cold-rolled steel sheet enclosures, spay paintedTransformer design dry, water or oil typeHigh Efficiency units with low operating temperaturesSuperior short circuit withstandMutliple DC current measurement types availableHarmonic studies availableTechnical Design AdvantagesHigh reliability design, components selection, topology, protection system, anti-interference measures, fully dynamical experiment ensure high reliability.Main circuit design, symmetric layout reduce loss and EMI effectively.Choosing fully floating, low forward conducting voltage drop thyristors, reduce thyristor loss, increase system efficiency and save energy.Pulse transformer adopts high frequency magnetic core, using high frequency pulse group triggering and strong triggering to ensure thyristors consistent triggering.Through thyristor's reasonable triggering angle to improve power factor.Multi-pulse configurations available, 6,12,18,24,36 or more pulse output available.  Technical SpecificationsInput voltage: 380V, 415V, 480V, 6kV, 10kVOutput power: DC up to 50MW.Constant current accuracy: ≤±0.5%.Constant voltage accuracy: ≤±0.5%Efficiency: ≥98%Power factor(cos phi): ≥0.87Ripple≤5% at rated valueControl: constant current controlControl mode: local control and remote controlCooling method:    Thyristor: forced air cooling or water cooling Transformer: dry type or oil immersed.Load grade: typeⅠ, full load long time running.Structure feature: front door and side door could be open for maintenance.Protection degree: IP54, avoiding corrosion to components inside cabinet.Paint finish: RAL7035 or custom designControl mode Setting, display and operation of rectifier is realized locally or remotely. Local control Start, stop, current/voltage regulation, output current, voltage display, fault alarm etc. Equipped with analog or digital voltmeter and ampere meter.Local operation: main circuit ON button, main circuit OFF button, local/remote control switch, constant current/voltage switch, emergency stop button.Local alarm: water pressure, overload, thyristor overheat etc. with audible-visual alarm.Local display: DC output voltmeter, ampere meter.Local setting: reference value setting.Remote control Remote setting: current reference value signal (4-20mA or 0-10V signal)Remote operation: output enabling signal.Remote display: DC output voltmeter(4-20mA or 0-10V signal), DC output ampere meter.Protection function When the rectifier works under constant current, it has overvoltage protection also with protection value 110% of rated output DC voltage(adjustable).When the rectifier works under constant voltage, it has overcurrent protection also with protection value 110% of rated output DC current(adjustable).Cooling water pressure protection: when water inlet pressure is lower than setting value, the rectifier alarms.Thyristor overheat protection: when thyristor is overheat, the rectifier alarms.When overload(overvoltage, overcurrent), thyristor overheat and water inlet pressure protections happen, the rectifier will alarm and be stopped operation automatically.