Multifunction Bus Transfer—Automatically transfer the motor bus feeder source in industrial plants to ensure process continuity. The bus transfer switches the motor bus to an alternate source via one of four transfer methods: fast, in-phase, residual, or fixed-time. Manual load transfer is also possible locally or remotely via communications. Power is restored before the motor slows down, protecting critical processes.

Complete Overcurrent Protection—Apply instantaneous and directional instantaneous overcurrent and time-overcurrent protection with as many as two sets of three-phase CTs and one neutral CT input. Phase overcurrent protection is provided for both three-phase inputs.

Synchronism Check—The built-in synchronism-check function provides supervision on both the X side and the Y side for the acceptable voltage window and maximum percentage difference, maximum and minimum allowable slip frequency, target closing angle, and breaker closing delay. The tie synchronism-check function provides the closing window for the bus-tie breaker when connecting to a utility system.

Breaker Wear Monitoring—Record accumulated breaker contact wear with the breaker monitor function, which uses the manufacturer’s specifications for defining breaker operation limits. The internal monitor tracks the total number of close/open operations and integrates the interrupted current per phase. You can set an alarm to alert operators when measured and accumulated quantities approach maintenance thresholds. This information facilitates proactive breaker maintenance and replacement without underutilizing resources.

LEA Sensor Inputs—The SEL-700BT can be ordered with low-energy analog (LEA) inputs to support medium- and low-voltage applications that use low-energy voltage sensors and Rogowski coils or other low-power current sensors. Order your device with the combination of LEA current and voltage inputs that suits your application.

Easy Communications—hoose from single or dual ports, copper or fiber-optic Ethernet or serial communications, and several protocols, including IEC 61850 Edition 2, EtherNet/IP, IEC 60870-5-103, the software-based IEEE 1588 Precision Time Protocol (PTP), IEC 62439 PRP and RSTP, Mirrored Bits communications, Modbus, DNP3 serial, and DNP3 LAN/WAN. Multiple Modbus TCP or Modbus serial sessions are available for custom configuration of your application.

Islanding Protection—Detect islanding conditions using the vector shift function with rate-of-change-of-frequency protection as backup. The vector shift function provides another element of protection for distributed generators connected to the utility network. It operates within three cycles—fast enough to prevent out-of-synchronization reclosing with the network feeders to avoid generator damage.

Reliable Protection in Harsh Environments—The SEL-700BT operates in extreme conditions, with an operating temperature of –40° to +85°C (–40° to +185°F), and it is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions. In addition, the SEL-700BT is ATEX-certified and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.