Project Description

SEL-849 Motor Management Relay

SEL-849 Motor Management Relay

The SEL-849 Motor Management Relay 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:

  • Short circuit
  • Load loss
  • Load jam
  • Frequent starting
  • Imbalanced current
  • Phase reversal

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.

SEL-3421 Motor Relay HMI with LCD SEL-3422 Motor Relay HMI without LCD
SEL-3421 Motor Relay HMI with LCD SEL-3422 Motor Relay HMI without LCD

Functional Overview

 SEL-849 Functional Overview
14 Speed Switch
27 Undervoltage
32 Directional Power
37 (C,P) Undercurrent, Underpower
46 Current Unbalance
47 Phase Reversal
49 Thermal Model
49P PTC Overtemperature
50G AF Arc-Flash Residual Overcurrent
50N Ground Overcurrent
50P AF Arc-Flash Phase Overcurrent
50 (P,G,Q) Overcurrent (Phase, Ground, Neg. Seq.)
50P LJ Load Jam
50P LR Locked Rotor
51 (P,G,Q) Time Overcurrent (Phase, Residual, Neg. Seq.)
55 Power Factor
59P Phase Overvoltage
60 Loss-of-Potential
66 Starts-Per-Hour
81 (O,U) Over-/Underfrequency
90 Load Control
AFD Arc-Flash Detector
CC Conformal Coating
DFR Event Reports—Motor Starts, Motor Operating Statistics, Sequential Events Recorder
HMI Operator Interface
LDP Load Data Profiling
LGC SELogic Control Equations
MET Metering—RMS Voltage and Current, Frequency, Power, Power Factor, Thermal, Thermal Capacity Used
SER Sequential Events Recorder
VFD Variable-Frequency Drive Support
WEB Web Server

* Optional

 

Front- and Rear-Panel Diagrams

SEL-849 Front Panel SEL-849 Side Panel
Front Side

 

MULTIPLE APPLICATIONS

The SEL-849 Motor Management Relay supports pumping applications for water, chemicals, and petroleum; air-based applications, including fans, blowers, air handlers, and compressors; chiller applications, such as compressors and air-conditioning; and applications involving bulk materials, such as conveyors, crushers, screeners, feeders, augers, and bucket elevators.

COMPACT DESIGN FOR MOTOR CONTROL CENTERS

The compact form factor easily installs in small motor control center (MCC) drawers and buckets. Built-in current transformers save room and reduce installation time.

EASY-TO-USE WEB INTERFACE

The web interface makes it easy for electricians and technicians to configure and monitor the SEL-849.

EASY INTEGRATION WITH CONTROL SYSTEMS

Several communications protocol options allow the SEL-849 to be used with old and new control systems.

ARC-FLASH HAZARD PROTECTION

MCCs typically have large fault-current potential, resulting in increased arc-flash hazards. The SEL-849 Relay’s arc-flash detection capability significantly reduces total arc-flash energy.

SEL has 2 types of arc-flash sensor:

Arc-Flash Point Sensor

1. Point Sensor

Arc-Flash Bare-Fiber Sensor

2. Bare-Fiber Sensor

RUGGED HARDWARE YOU CAN RELY ON

All SEL relays are designed to operate in harsh environments where other relays may fail. The SEL-849 operates in extreme conditions, with an operating temperature of –40° to +85°C (–40° to +185°F), and is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions

 

Comparison

710
710-5
749M 701 849
Induction Motor Protection
Synchronous Motor Protection +
Feeder Protection
Breaker Failure Protection f f
Equipment Thermal Monitoring + + +
27/59 Under-/Overvoltage + + +
32/37 Directional/Underpower Elements + + + +
40 Loss-of-Field +
46 Current Unbalance
47 Phase Reversal
49 Thermal
50 (P,N,G) Overcurrent (Phase, Neutral, Ground)
50Q Negative-Sequence Overcurrent
51 (N,G) Time-Overcurrent (Neutral, Ground)
51 (P,Q) Time-Overcurrent (Phase, Neg. Seq.)
55 Power Factor + +
60 Loss-of-Potential + f f +
78 Out-of-Step +
81 Over-/Underfrequency + +
87 Current Differential +
Arc-Flash Detection +
Separate Neutral Overcurrent
Broken Rotor Bar Detection +
SELogic Control Equations/Remote Control Switches
Nonvolatile Latch Control Switches
Multiple Settings Groups
Breaker Wear Monitor
Event Report (Multicycle Data)/Sequential Events Recorder
Demand Meter
Load Profile Report
RTD (Resistance Temperature Detector) Inputs + + +
Ethernet +
IEC 61850 + +
DNP3 LAN/WAN +
Simple Network Time Protocol (SNTP)
Modbus TCP
Modbus RTU Outstation
Synchrophasors With IEEE C37.118 Protocol
Mirrored Bits Communications
DeviceNet + +
Accepts Wye or Open-Delta Voltage Transformers + + +
Standard Feature
+ Model Option
f This function may be created using settings

Product Literature