Applications of Siemens SIPROTEC Relays have revolutionized the transfer scheme designs. Using only two basic feeder protection relays Siemens can realize for example a Fast Motor Bus Transfer Scheme per ANSI C50.41-2000. Motor Bus systems are critical loads which can not endure long separations from the power supply. In both industrial and utility power plant applications, the consequences of an unplanned motor bus outage can be costly, time consuming and dangerous.

The load must be transferred to a redundant source. The speed of this transfer is critical for the stress of the electrical system, the continuity of plant operations and the protection of the motors. The High-Speed Motor Bus Transfer Scheme is capable of providing both close and open transition transfers. Transfer schemes are realized for most applications per customer specifications. The whole system is delivered fully programmed, tested and ready for installation. Optionally incorporating IEC61850 communications makes implementation fast, secure and cost-effective.