After studying the electrical protection system and protection settings needed to guarantee performance, Nidec Industrial Solutions designed a low-voltage power supply system and hardware and software for a Level 1 automation system, including interface with HMI and level 2 automation. Nidec’s electrical board design called for rated voltage of 500V ±15% and short circuit current of 55 kA.
The new plants’ automation systems were designed to interface with the steel mill’s other plants and units. The primary automation functions designed, implemented and commissioned by Nidec included:
• Oxygen lance burner control and lance lifting systems
• Vacuum generating systems, including water ring pumps and steam injector systems
• New water treatment system and interfaces
• New material handling systems and interfaces, including recipe management and prioritization
• Dedusting systems, wire injection stands and ladle and maintenance cars
To reduce commissioning time and guarantee the systems’ quality, Nidec arranged to simulate the steel mill’s operation in its offices, where it tested the electrical and automation systems prior to installation. This testing enabled Nidec to complete any necessary debugging prior to installation, which served to speed the commissioning process and improve system quality.
To help assure smooth start-up and long-term operation, Nidec also compiled detailed technical documentation of all the plants’ hardware, software, subsystems and package units.