SEL SEL-700BT Motor Bus Transfer Relay

SEL-700BT

Motor Bus Transfer Relay

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.

The 5-inch, 800 × 480 color touchscreen display allows you to directly set, monitor, and control your system, including up to two breakers and eight two-position and two three-position disconnect switches.

A small form factor and multiple mounting adapters make it easy to upgrade protection without cutting or drilling existing cutouts.

You can quickly integrate the SEL-700BT into serial- or Ethernet-based communications with EtherNet/IP, the Rapid Spanning Tree Protocol (RSTP), IEC 61850 Edition 2. IEC 60870-5-103. the IEC 62439 Parallel Redundancy Protocol (PRP), Mirrored Bits communications, Modbus, DNP3. and other protocols.

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.

SEL-700BT

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—Choose 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.

Flexible I/O for Local Control and System Applications

The base system includes three digital outputs and two digital inputs. There are two card slots for optional SELECT I/O cards, including the following:

4 digital inputs (DI) and 4 digital outputs (DO)

4 DI and 4 fast, high-current interrupting DO

4 DO, 3 DI, and one analog output (AO)

4 DI and 3 DO (2 Form C and 1 Form B)

4 analog inputs (AI) and 4 AO

LEA voltage sensor inputs and Rogowski coil/LPCT inputs

8 DI

8 DO

14 DI

10 internal RTD inputs

Integrated Communications

The SEL-700BT offers many communications media and protocol options. Versatile communications options provide fast integration into both new and existing applications.

Communications Media

Ethernet 10/100BASE-T

Ethernet 100BASE-FX

Single or dual Ethernet ports

EIA-232 serial

EIA-485 serial

Communications Protocols

DNP3 LAN/WAN

DNP3 serial

Modbus TCP/IP

Telnet

File Transfer Protocol (FTP)

SNTP

EtherNet/IP

IEEE 1588 PTP

IEC 61850 Edition 2

IEC 60870-5-103

IEC 62439 PRP and RSTP for models with dual Ethernet

Languages

Ordering option is available for English or Spanish language support.