SEL-700BT

Motor Bus Transfer Relay

The SEL-700BT is a comprehensive Motor Bus Transfer (MBT) protection relay designed for critical process environments. When a fault occurs on the primary power source, it provides automatic and manual transfer of critical loads to an auxiliary feeder. This ensures continuous process operation without requiring a "cold start" of motors after they have stopped.

Key Features

Four Transfer Methods

Supports Fast, In-phase, Residual Voltage, and Fixed-time transfer methods to perform the most appropriate transfer based on real-time system conditions.
Flexible Transfer Modes

Supports both Sequential and Simultaneous transfer modes to accommodate various breaker configurations and operational requirements.
Comprehensive Protection Suite

Provides robust primary and backup motor bus protection, including current, voltage, frequency, distance, loss-of-potential, and out-of-step elements.
Latest Sensor Technology Compatibility

Supports Low-Energy Analog (LEA) voltage sensors, Rogowski coils, and Low-Power Current Transformer (LPCT) inputs, making it ideal for modern digital substation and switchgear designs.
Combined Winding Overcurrent Protection

Includes a combined winding overcurrent element for more precise and reliable overload and fault protection.
Enhanced Network Reliability

Supports Rapid Spanning Tree Protocol (RSTP) and Parallel Redundancy Protocol (PRP) to ensure uninterrupted data transmission and rapid recovery in the event of a network failure.

5-Inch Color Touchscreen

Features a large touchscreen HMI that allows users to intuitively monitor bay screens, metering values, and event reports, and operate the device locally.
Extensive Standard Protocols

Supports a wide array of protocols, including IEC 61850 Edition 2, DNP3, Modbus TCP/RTU, EtherNet/IP, Telnet, and FTP, ensuring seamless integration with existing systems.
Precise Time Synchronization

Supports IEEE 1588 PTP (Precision Time Protocol) to provide microsecond-level accuracy for event recording and system-wide synchronization.
Versatile I/O Scalability

Offers hardware expansion options to meet specific field requirements, including serial communication cards, RTD inputs, analog inputs/outputs (AI/AO), and various digital I/O cards.
User-Friendly Software

SEL configuration tools allow users to visually configure and manage complex bus transfer logic and protection settings.