SEL-710-5

Motor Protection Relay

The SEL-710-5 is an advanced protection, control, and monitoring system for induction and synchronous motors. This relay maximizes motor availability using a patented, accurate thermal model and simplifies design by integrating synchronous motor protection and power factor regulation into a single device. It is optimized for modern industrial environments, supporting the latest sensor technologies and a color touchscreen interface.

Key Features

Comprehensive Motor Protection

Supports both induction and synchronous motors, providing a wide range of ANSI protection functions, including overcurrent (50/51), unbalance (46), under/overvoltage (27/59), and loss-of-field (40).
Accurate Thermal Model Protection

Utilizes a patented thermal protection algorithm to track the motor's actual thermal state in real time, preventing nuisance trips while ensuring the motor remains within safe operating limits.
Broken Rotor Bar Detection

Identifies broken rotor bars or early defects, allowing for planned maintenance before a catastrophic failure occurs.
Ultra-Fast Arc-Flash Protection

Uses optical sensors to detect arc-flash events within 2–5 ms, quickly clearing the fault to protect personnel and equipment.
Support for Modern Sensor Technology

Compatible with Low-Energy Analog (LEA) voltage sensors, Rogowski coils, and Low-Power Current Transformer (LPCT) inputs, enhancing installation flexibility in small enclosures.
Synchronous Motor Power Factor Control

Provides integrated functionality to regulate the excitation system of synchronous motors, maintaining a constant power factor or controlling reactive power.
Advanced Event Analysis

Includes high-resolution Motor Start Reports (MSR) and fault summaries to analyze starting characteristics and pinpoint the root cause of failures.

5-Inch Color Touchscreen

Features a large 800x480 resolution touchscreen HMI, enabling intuitive local monitoring and operation of bay screens, one-line diagrams, metering values, and device status.
Extensive Standard Protocols

Supports various protocols, including IEC 61850 Edition 2, DNP3, Modbus TCP/RTU, EtherNet/IP, PRP, and RSTP, ensuring seamless integration with existing control systems.
Intuitive Control Buttons

Equipped with programmable pushbuttons and LEDs on the front panel, allowing field personnel to perform local control and status checks quickly.
Precise Time Synchronization

Supports IEEE 1588 PTP (Precision Time Protocol) to maintain microsecond-level time accuracy and ensure synchronization across the entire system.