Specialized in the design and construction of industrial
transformers*• Through-put rating up to 150 MVArIn electric arc
furnaces, which use long arcs and high values of secondary voltage,
it is often helpful to introduce an additional reactorwith the
purpose of:Arc stability and power regulationOptimisation
electrodes consumptionLimitation of current during smelting
processReduction of flicker on the feeding network.The reactors are
series connected with the furnace transformers and have some
regulation taps (for the reactance regulation) operatedwith either
an onload tap changer (OLTC), for maximum flexibility, or with a
de-energized tap changer (DETC). The reactor can be
assembled:Inside the main transformer tankEntirely separated from
the transformerLocated next to the transformer (On Board
Reactor).In the OBR (On Board Reactor) solution, the reactor and
the transformer are linked by a removable cable duct.Extends
equipment lifecycle due to reduced unstable arc furnace
currentsHigh mechanical strength withstands elevated forces caused
by elevated switching currentsTap adjustment is possibleInductance
of the reactor is frequently variable and requires large adjustment
stepsConservative temperature rise ensures extended service
lifeSurface treatment protects against UV radiation and
pollutionEnvironmentally friendlyMaintenance-free
designAuxillary voltage for power circuits220 Vac, 50 Hz , 3 phaseControl Voltage24 VdcNominal Voltage34.5 KV 50 Hz, 3 phaseRated capacity51.840 MVArRated current2400 AX ( Ω/phase )3ΩInsulation level ( 1U,1V,1W )95/250 KV BILVector GroupiiiMaximum allowable temperature rise for oil60 KMaximum allowable temperature rise for winding65 KNumber of positions 7 ( pos1: 0 Ω, po2: 0.5 Ω, pos3: 1Ω , pos4: 1.5 Ω, pos5: 2 Ω, pos6: 2.5 Ω, pos7: 3 Ω,Tap changer mechanismOn-load tap changer, MR brandOil filter equipment for OLTCAll diverter switch compartments oil will be circulated through a filter circuit equipped with filter clogged electrical signal.Shell and tube heat exchangersdouble wall type, quantity two , each with %100 cooling capacity. Inlet water temperature: 35 C. 2 oil circulation pumps. Temperature and flow indicators both for oil and water circuitsReactor condition monitoringOil level indicators for expansion tanks, oil and winding temparature indicators.Reactor protectionBucholz relay with relevant alarm and trip contact connections. Pressure relief valve for tank over pressure protection, equipped with trip contact./*
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