Converters for electric resistance furnace control

Converter for electric resistance furnace functions as a power source for an electric resistance furnace (ERF).

The converter ensures the following:

  • automated temperature raming of ERF with a given tempo;
  • accurate control of temperature characteristic as required according to the technology;
  • smooth regulation of ERF input voltage.

The above-mentioned advantages of the converter allow for:

  • decrease in electric power consumption by ERF;
  • increase of the heating element lifetime (contactless switching and no kick start heatup of the heating element).

General technical characteristics

  • rated current and voltage range:
    – rated currents: from 10 to 1000 A;
    – rated voltage: from 10 to 1000 V;
  • type of transformer:
    – air-immersed transformer;
    – indoor or outdoor installation;
  • power block:
    – with star- or delta-connected heating elements:
    two opposite-parallel connected thyristors in each secondary (or primary) phase of supply transformer;
    – with series connected heating elements:
    thyristor rectifier connected according to a three-phase bridge circuit;
    – single-phase version of the above-mentioned options;
  • cooling:
    – natural air;
    – forced air;
  • network interfaces:
    – Profibus DP, Modbus RTU, Modbus TCP (Ethernet), CAN, etc.

It is possible to implement the converter with any technical characteristics in accordance with the Terms of Reference agreed with the Customer.

Control system

All tasks of the control system are executed by using software and hardware.
The output signals of CS are:

  • thyristor converter control pulses;
  • a circuit breaker trip signal;
  • indication of operating modes;
  • text messages on the console terminal with regard to the operating modes and causes of emergency shutdowns;
  • communication with Automated Process Control System.

CS registers the following melting parameters:

  • smelting power;
  • power consumption during the smelting process.

Flexible adjustment structure, open for interaction from an external automation system / controller through network interfaces.

Protection system

ERF converter provides for the following types of protection:

  • maximum current protection;
  • open circuit protection;
  • heaters overheating protection;
  • technological protection;
  • control system power source failure.

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