Description
Specialized in the design and construction of industrial transformers
*• Through-put rating up to 150 MVAr
In electric arc furnaces, which use long arcs and high values of secondary voltage, it is often helpful to introduce an additional reactor with the purpose of:
- Arc stability and power regulation
- Optimisation electrodes consumption
- Limitation of current during smelting process
- Reduction of flicker on the feeding network.
The reactors are series connected with the furnace transformers and have some regulation taps (for the reactance regulation) operated with 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 tank
- Entirely separated from the transformer
- Located 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 currents
- High mechanical strength withstands elevated forces caused by elevated switching currents
- Tap adjustment is possible
- Inductance of the reactor is frequently variable and requires large adjustment steps
- Conservative temperature rise ensures extended service life
- Surface treatment protects against UV radiation and pollution
- Environmentally friendly
- Maintenance-free design
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Auxillary voltage for power circuits 220 Vac, 50 Hz , 3 phase Control Voltage 24 Vdc Nominal Voltage 34.5 KV 50 Hz, 3 phase Rated capacity 51.840 MVAr Rated current 2400 A X ( Ω/phase ) 3Ω Insulation level ( 1U,1V,1W ) 95/250 KV BIL Vector Group iii
| Maximum allowable temperature rise for oil | 60 K |
| Maximum allowable temperature rise for winding | 65 K |
| Number 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 mechanism | On-load tap changer, MR brand |
| Oil filter equipment for OLTC | All diverter switch compartments oil will be circulated through a filter circuit equipped with filter clogged electrical signal. |
| Shell and tube heat exchangers | double 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 circuits |
| Reactor condition monitoring | Oil level indicators for expansion tanks, oil and winding temparature indicators. |
| Reactor protection | Bucholz relay with relevant alarm and trip contact connections. Pressure relief valve for tank over pressure protection, equipped with trip contact. |
