Power supply unit for ESR furnaces

Power: 300 to 3000 kW

Power: 300 to 3000 kW

Frequency: 2 to 10 Hz

Frequency: 2 to 10 Hz

Built-in cooling system

Built-in cooling system

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.

Complete set:

  • 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.

 

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
Operation modes continuous
Auxiliary supply voltage, V 220 / 380
Installation internal
Transformer cooling system ONAF

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