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Application Guide
Basic Feeder Protection Using SEL-849
I
NTRODUCTION
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.
F
D
ACTORY
EFAULT
Figure 1 shows the connection diagram for factory default I/O assignments for feeder protection
using the SEL-849.
A
B
C
+/H
IA
IB
IC
Source
Load
–/N
52
Feeder
Figure 1 Connection Diagram for Factory Default I/O Assignments for Feeder Application
C
SEL-849
ONFIGURE THE
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.
Date Code 20151102
Factory Logic
Anthony Rahiminejad
L
C
OGIC
ONNECTION
A3
E1
E4
OUT01
OUT02
A2
E2
E3
E5
52A
52B
TC
CC
B
FOR
ASIC
Volume VIII
Open
52A
B1
B2
B3
B4
IN01
COM
IN02
IN03
COM
0102
0304
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)
F
P
EEDER
ROTECTION
AG2015-33
Close
B5
B6
B7
B8
B9
IN04
IN05
COM
IN06
0506
SEL-849
SEL Application Guide 2015-33
Select
Control
Mode
Remote
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Summary of Contents for Sel SEL-849
- Page 1 Factory Logic Anthony Rahiminejad NTRODUCTION 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.
- Page 2 Step 2 Open an Internet browser and type the SEL-849 default IP address (169.254.0.1) into the URL address bar, as shown in Figure 2. Figure 2 SEL-849 IP Address Step 3 Select 2AC: View and Change in the Access Level tab. Type the default password OTTER into the ACC Password field and TAIL into the 2AC Password field.
- Page 3 Rogowski coil current transformers (CTs). External CTs must be used, where the external CT leads are passed through the CT inputs of the SEL-849. When using external CTs, divide the CT primary by the CT secondary. Enter this value into Phase CT Ratio 1 (CTR1). If a core balance CT is used for ground fault sensing, Core Balance CT Ratio (CTRN) should be set equal to the core balance CT ratio, and modifications to the factory logic will be required.
- Page 4 Instantaneous Overcurrent menu and setting Residual IOC 1 Pickup (50G1P) and Residual IOC 1 Delay (50G1D). The phase and residual instantaneous overcurrent settings should be determined by a power system protective device coordination study. Figure 6 Instantaneous Overcurrent Settings SEL Application Guide 2015-33 Date Code 20151102...
- Page 5 Figure 7 Time-Overcurrent Settings Step 9 Verify the new settings, and click Submit Changes at the bottom of the page. The SEL-849 is now configured for basic feeder protection. ONCLUSION This application guide demonstrates how to configure the SEL-849 to provide basic feeder protection for a 480 V switchboard using factory logic and settings provided by a protective device coordination study.
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Page 6: Factory Assistance
ACTORY SSISTANCE We appreciate your interest in SEL products and services. If you have questions or comments, please contact us at: Schweitzer Engineering Laboratories, Inc. 2350 NE Hopkins Court Pullman, WA 99163-5603 USA Telephone: +1.509.332.1890 Fax: +1.509.332.7990 www.selinc.com • info@selinc.com ©...