The large crucibles and vats used in smelting systems are often moved by electric motors with various voltages and currents. Reliable uninterrupted power is required to prevent the molten metal from solidifying in these containers. The power supply or transformer grounding is often designed as ungrounded or resistance grounded. Bender fault location systems are available for both resistance grounded and ungrounded systems to quickly and automatically locates defective power circuits. Safety and uptime are both improved.
Low-Voltage Power Distribution
The power supply is critical to refining and smelting systems. The medium voltage supplied to the facility is transformed down to 480 V or 600 V and distributed through the facility via electrical cables or busbars often referred to as branch feeders. It is then either connected to loads or transformed to lower voltages. Depending on the system grounding either a Bender ISOMETER®s or RCMS residual current monitoring relays (ground-fault monitors) monitor these and help ensure continuous operation. Fault detection is only the first step in troubleshooting. The addition of downstream monitors and current sensors can allow quicker and safer location of ground faults. References mention that approximately 80-95% of the faults in a facility start as a phase-to-ground fault - making this time savings compound the return of investment.
Continuity of Service Control fault current and have alarm-only operation on the first ground-fault.
Improved Safety Reduces potential for shock and arc flash hazard. Arc flash is reduced by as much as 95%. Automatic fault location at feeders and loads can eliminate the need to open doors on energized equipment during troubleshooting.
Ease of Retrofit Ability to easily and cost-effectively upgrade older equipment.
Reduces Maintenance Costs Accuracy of detection leads to a decrease in maintenance costs and the need for human interaction with the system.