Sel SEL-849 User Manual

Date Code 20151102 SEL Application Guide 2015-33
Application Guide Volume VIII AG2015-33
Basic Feeder Protection Using SEL-849
Factory Logic
Anthony Rahiminejad
INTRODUCTION
The SEL-849 Motor Management Relay offers advanced low-voltage motor protection in a
compact and economical design, but it can also be used to provide basic feeder protection for a
variety of applications.
This application guide demonstrates how to configure the SEL-849 to provide overcurrent
protection for a feeder protection application.
FACTORY DEFAULT LOGIC CONNECTION
Figure 1 shows the connection diagram for factory default I/O assignments for feeder protection
using the SEL-849.
52
A
B
C
SEL-849
Select
Control
Mode
Remote
CloseOpen
52A
B9
IN06
B8
COM
0506
B7
IN05
B6
IN04
B5
COM
0304
B4
IN03
B3
IN02
B2
COM
0102
B1
IN01
E4
E1
OUT01
OUT02
E2 E3 E5
52B52A
A2
A3
–/N
+/H
IA IB IC
Source
Load
Feeder
Settings:
APP := FEEDER
CURR_IN := NORMAL
FACTLOG := Y
OUT01 = (TRIP OR STOP) (Hidden)
OUT02 = STR_CLO (Hidden)
OUT03 = (50PAF OR 50GAF) AND TOL1 (available for user)
OUT04 = HALARM OR SALARM (available for user)
TC
CC
Figure 1 Connection Diagram for Factory Default I/O Assignments for Feeder Application
CONFIGURE THE SEL-849 FOR BASIC FEEDER PROTECTION
The example settings used in this section are for a 1,200 A feeder supplying a 480 V switchboard.
Perform the following steps to configure the SEL-849.
Step 1
Connect the computer to PORT2A or PORT2B of the relay using an Ethernet cable. Check the
LED for connectivity status.

Sel SEL-849 Specifications

General

Nominal AC Voltage	120/240 Vac
Nominal DC Voltage	125/250 Vdc
Current Rating	Up to 5 A
Frequency	50/60 Hz
Trip Coil Current	User-configurable
Protection Functions	Overload, Short Circuit, Ground Fault
Communication Protocols	DNP3
Operating Temperature	-40 to +85 °C

Summary

Introduction to SEL-849 Basic Feeder Protection

Factory Default Logic and Connections

Factory Default I/O Assignments

Diagram of default I/O assignments for feeder protection using the SEL-849 relay.

Configure SEL-849 for Basic Feeder Protection

Connect Computer to Relay

Connect computer to PORT2A or PORT2B of the relay using an Ethernet cable.

Access SEL-849 Web Server

Open an Internet browser and type the SEL-849 default IP address (169.254.0.1).

Login to SEL-849 Web Server

Select Access Level, enter default passwords (OTTER/TAIL) and click Login.

Configure Basic Settings

Set rated frequency, phase rotation, and application type (FEEDER).

Configure CT Ratios and Full Load Amps

Set Phase CT Ratio (CTR1) and Full Load Amps (FLA1) based on feeder and CT specifications.

Enable Factory Logic

Ensure Factory Logic (FACTLOG) is set to Y in Configuration Settings.

Configure Instantaneous Overcurrent Settings

Set instantaneous overcurrent pickup and delay for phase and residual faults.

Configure Time-Overcurrent Settings

Set time-overcurrent pickup, curve, and time dial for phase and residual faults.

Submit Configuration Changes

Verify settings and submit changes to apply the basic feeder protection configuration.

Conclusion

Factory Assistance