H.V. TEST (PTY) LTD
Leaders in Furnace Monitoring Equipment

Contact Pad - Rogowski Coil (High Current CT) - Sub Merged Arc Furnace Monitoring Equipment Introduction The System was designed to provide a accurate simultaneous   measurement of the individual contact pads, Kilo Amps and Summated electrode current.  This has not been possible in the past. H.V. TEST (PTY) LTD in South Africa. Have developed a unique system for the measure of these currents. A number of these systems have been successfully operating on Submerged Arc Closed Top Furnaces since 1998. System Goal The measurement of the individual electrode contact pad currents using current transducers, signal processing, isolation and a monitoring system. The system can be integrated into the existing PLC or similar  furnace control system. The goal is to monitor each contact pad to determine when overloading & under loading occurs due to poor contact or green electrode problems. The System can record trends predicting contact pad problems, electrode slipping changes and possible green electrode changes. The System Each set of bustubes is monitored by the system and individual signals are transferred to the control room. The signals can be incorporated in the existing monitoring and recording system or a dedicated PC. The PC will present a visual picture of the furnace, the contact pads and the electrodes. When a Contact Pad is been overloaded or underloaded the screen will alarm red or green together with a audible alarm. Next to each contact shoe, the current in KA will be reflected together with the phase current/transformer as well as the victory summated electrode current. Should the current on the contact pads vary dramatically this could be an indication of: Poor Contact pad service pressure problems Overslipping of the electrode and that a green electrode is eminent. Indication of furnace mix problems Electrode Breakages Secondary Transformer winding overloading Cooling water temparature problems Electrode casing problems Cavitation in the electrode   Conclusion We believe that this monitoring system will provide the furnace operators with valuable information allowing optimised operation of the furnace.