Power supply unit for ESR furnaces
Electroslag melting is used for cakes forming of very high quality with definite features (including electric steel).
Electrode lowered into slag is to be a load: melting process is performed due to current run from electrode to slag. Electrode is a consumable one.
ESTEL supply sources for ESM furnaces are assembled as a rule according to inverter circuit with direct communication. Circuit includes two counter-coupled rectifiers and furnace is to be a load itself. Switching alternatively rectifiers the out voltage can be get with variable frequency 2 to 10 Hz.
- two rectifiers
- cooling system
- control cabinet
- transformer (optional)
Supply sources for ESM furnaces can be manufactured with various parameters. Below are given specifications in terms of one certain inverter.
|Rated power of transformer winding, kVA||8750|
|Mains rated frequency, Hz||50|
|Mains rated voltage, kV||10 or 6|
|Number of mains phases||3|
|Inverter rated out voltage, V||150|
|Inverter rated out current, A||50000 (4×12500)|
|Gradual frequency adjustment range at inverter out, Hz||1÷5|
|Number of converter phase out||1|
|Analog rectification circuit||circular/6-pulse|
|Transformer voltage adjustment||РПН|
|Tension adjustment depth, %||40|
|Rectified voltage adjustment range, V||150÷90|
|Number of tank stages||7÷10|
|Transformer valveside winding voltage, V||123.4|
|Rated leanear current of transformer valveside winding, A||7 217|
|Short circuit through tension, %||8|
|Auxiliary supply voltage, V||220 / 380|
|Transformer cooling system||ONAF|