SEL understands how critical it is to provide continuous, reliable motor protection. That is why SEL offers industry-leading products with the most extensive warranty. SEL motor protection relays give customers a custom-fit motor protection system with easy installation for both retrofit and new applications.
Advantages of SEL Motor Protection
Preserve Process Reliability With Multifunction Bus Transfer
Industrial facilities with critical processes require a reliable supply of electric power and typically have two incoming sources. To ensure process continuity during a fault to the primary feeder, the SEL-700BT Motor Bus Transfer Relay quickly and safely transfers loads to an auxiliary feeder. This functionality keeps processes running without requiring a cold start, helps avoid costly shutdowns, provides personnel safety, and helps avoid environmental damage. A single SEL-700BT can protect and control a critical main-main load bus by selecting from two sources automatically, and two SEL-700BT relays (one on each side of the intertie) can transfer the load bus between sources in a main-tie-main configuration.
The SEL-700BT is an effective solution for an industrial motor bus transfer system, with multiple source transfer algorithms, flexible I/O, and advanced communications. It ensures process continuity by transferring critical loads from a primary source to an auxiliary feeder during faults in the primary feeder line. The relay allows automatic motor bus transfers using fast, in-phase, residual, and fixed-time methods to keep processes running without requiring a cold start. It is also possible to manually transfer load locally or remotely via communications.
Protect asynchronous (induction) and synchronous motors with one SEL-710-5 Motor Protection Relay. New features include broken rotor bar detection and variable-frequency drive (VFD) support as well as options for arc-flash detection, differential protection, and synchronous motor protection. The synchronous option also includes, at no additional cost, a voltage divider accessory to interface with the motor excitation system. Together with the industry’s best AccuTrack Thermal Model, these new features combine to provide a great solution for all of your motor protection applications.
The SEL-849 offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including protection for the following conditions:
The SEL-849 installs easily inside a motor control center (MCC). The optional SEL-3421 and SEL-3422 Motor Relay HMIs (human-machine interfaces) install on the front of the MCC.
Measure and transmit data from up to 12 RTDs and a single contact status located in transformers, breakers, motors, generators, or other system apparatus.