Description: 
The medium frequency solid state power supply units from 5 kW to 12000 kW cater to the needs of steel industry, foundries and heat-treatment industry. These units are offered by Electrotherm. The frequency power supply unit consists of 6, 12 or 24 pulse rectifiers, DC chokes, current fed inverter, capacitor bank, furnace selector switches and DM water circulation unit. Compact and yet spacious layout of converter and inverter assembly facilitates ease of maintenance. Twelve and 24 pulse rectifiers reduce total harmonic distortion as per IEEE-519 norms. The controlled rectifier acts as a fast tripping electronic device for maximum safety of components in case of short circuit. The current fed inverter has the highest efficiency, as current through the thyristor is very low. It uses less variety and less number of power components ensuring long life, easy maintenance and low down time. Stainless steel sacrificial electrodes are used to prevent electrolysis of copper components. Magnet float assembly in conjunction with sensitive proximity switches are used to monitor flow in different paths. The special attributes of these units include: highest efficiency of power supply unit up to 97%, full power from start to end of melt cycle, best quality and high safety factor in component selection, reliable multiple protection, efficient and reliable closed-loop DM water cooling system with flow monitoring devices for individual path, earth leakage protection for operator safety, built-in test facility and safe and maintenance friendly layout. It operates under wide voltage fluctuation and has a power factor up to 0.98. It is suitable for operation with captive power generation, and the use of Teflon wire for high voltage circuit eliminates the risk of short circuit during fire.
