Sel SEL-849 Guía del usuario

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.

SEL-849

Select

Control

Mode

Remote

CloseOpen

52A

IN06

COM

0506

IN05

IN04

COM

0304

IN03

IN02

COM

0102

IN01

OUT01

OUT02

E2 E3 E5

52B52A

–/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 Application Guide 2015-33 Date Code 20151102

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. Click Login, as shown in

Figure 3. Changing the default passwords is recommended.

Figure 3 Built-In Web Server Login Screen

Date Code 20151102 SEL Application Guide 2015-33

Step 4

From the drop-down menu on the left-hand side of the page, select Settings > Protection > Basic

Settings. The rated frequency and phase rotation should be set based on the power system. In this

example, the SEL-849 is applied on a 60 Hz power system with ABC phase rotations.

Application (APP) should be set to FEEDER. See Figure 4 for an example of basic settings for a

feeder application.

Figure 4 Basic Settings

Step 5

In this example, the nominal feeder current is 1,200 A, which exceeds the 128 A limit of the

integrated 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. Set

Full Load Amps (FLA1) equal to the current rating of the feeder to be protected divided by the

Phase CT Ratio 1 (CTR1) value (see Figure 4). In this example, 1200/5 external CTs are used

and the current rating of the feeder is 1,200 A.

Note that the SEL-849 includes optional voltage, power, and arc-flash protection and control

elements that are not discussed in this application guide. Refer to the SEL-849 Instruction Manual

for additional details.

SEL Application Guide 2015-33 Date Code 20151102

Step 6

Select the Configuration Settings menu and ensure that Factory Logic is set to Y, as shown in

Figure 5.

Figure 5 Configuration Settings

Step 7

Select the Phase Instantaneous Overcurrent menu and set Maximum Phase IOC 1 Pickup

(50P1P)equal to the phase instantaneous pickup, as shown in Figure 6. The instantaneous delay

can be adjusted using Maximum Phase IOC 1 Delay (50P1D). Modifications to factory logic

are necessary to set the instantaneous delay below 0.10 seconds.

Repeat this process for instantaneous ground fault protection by selecting the Residual

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

Date Code 20151102 SEL Application Guide 2015-33

Step 8

Select the Phase Time Overcurrent menu and set MAX Phase TOC Pickup (51P1P)equal to

the phase time-overcurrent pickup or tap setting, as shown in Figure 7. The curve shape is

determined by setting MAX Phase TOC Curve (51P1C) equal to one of the available settings

from the drop-down menu. MAX Phase TOC Time Dial (51P1TD) should be set equal to the

time-dial setting.

Repeat this process for time-overcurrent ground fault protection by selecting the Residual Time

Overcurrent menu and setting Residual Ground TOC Pickup (51G1P), Residual Ground

TOC Curve (51G1C), and Residual Ground TOC Time Dial (51G1TD). The phase and

residual time-overcurrent settings should be determined by a power system protective device

coordination study.

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.

CONCLUSION

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. The SEL-849 provides basic protection in a compact, economical

solution for various medium- and low-voltage feeder applications, with optional voltage and

power protection and control elements available.

SEL Application Guide 2015-33 Date Code 20151102

FACTORY ASSISTANCE

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 • [email protected]

All brand or product names appearing in this document are the

trademark or registered trademark of their respective holders. No

SEL trademarks may be used without written permission.

SEL products appearing in this document may be covered by

U.S. and Foreign patents.

*AG2015-33*

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