Technology SMART-ARC

The system ARCING CONTROLLER «SMART-ARC» executes the following main functions:

• Threeindependentimpedancecontroller (oneforeachphase);
• Oneadditionalovercurrentcontroldevice;
• Shortcircuitdetectionandacceleratedelectrodelifting;
• Storage of the preset value;
• Protection functions for the furnace switch, tap changing device etc.

Hardware

Electrode controller is based on SIMATICS7-400. The supplied coil voltage transformers and Rogowski integrators as the current sensors serve for collection of the secondary voltage and current data.

 Communication

Communication interface Industrial Ethernet serves for transmission of the relevant operational data and parameters to other programmable logic controllers or PC.

 Current data collection

Secondary current measurement is carried out through the Rogowski coils:

• Rogowski coils – 3 pcs
• Rogowski integrator – 3 pcs
• Measuring transducers – 3 pcs

Measuring transducers convert low-voltage circuit signals into the normalized signals 4 – 20 mA for transmission to the controller.

Voltage data collection

Secondary voltage data collection is carried out through the transformer cabinet, which is equipped with three voltage transformers, arrester and fuse system, measuring signal transducers. Measuring transducers convert low-voltage circuit signals into the normalized signals 4- 20 mA for transmission to the controller.

System software

 Controllersoftwareisbasedonthestandarddesignpackage STEP7, usingthelanguage of graphicdesign CFC (Continuous Flow Chart).
System software is used as a framework, which can implement the new control philosophy and which meets the requirements of the future.

 The offered software package should be considered as the off-the-shelf software, which doesn’t include the engineering documentation. Package allows access to all the parameters and control points, needed for running, that’s why there is no need for modification implementation in any program steps. Updating and/or package upgrading are carried out only by Contractor.

 Advantagesof the ARCING CONTROLLER

ARCING CONTROLLER SMART-ARC makes possible toperform such the most important modern requirements, as quality and cost optimization. The main advantages are:

The time reduction of the power consumption

• Reduction of the power consumption
• Reduction of the electrode consumption
• Minimal coefficientof the electrode breakdown
• Increase of the service life of the ladle furnace walls
• Reductionoftheladlefurnaceloads