Schweitzer Engineering SEL-300G User manual

20170804
SEL-300G
Multifunction
Generator Relay
Quick-Start Guide
*PM300GQS-01*

SEL-300G Relay Quick-Start Guide Date Code 20170804
© 1998–2017 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
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.
Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in
its products, including without limitation software, firmware, and documentation.
The information in this document is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language document.
This product iscovered by the standard SEL 10-year warranty. For warranty details, visit selinc.com or contact your customer service
representative. PM300GQS-01

Date Code 20170804 Quick-Start Guide SEL-300G Relay
Table of Contents
List of Tables...................................................................................................................................................... iii
List of Figures..................................................................................................................................................... v
Preface.................................................................................................................................................................. vii
Overview .......................................................................................................................................................... vii
Safety Information........................................................................................................................................... vii
Factory Assistance............................................................................................................................................ ix
Relay Commissioning Procedure.................................................................................................................. 1
Introduction ........................................................................................................................................................ 1
Required Equipment.......................................................................................................................................... 1
Commissioning Procedure................................................................................................................................. 2
Serial Port Command Summary.................................................................................................................. 12
Front-Panel Pushbutton Operation............................................................................................................ 14
Overview .......................................................................................................................................................... 14
Primary Functions ........................................................................................................................................... 14
Front-Panel Password Security........................................................................................................................ 15
Secondary Functions ....................................................................................................................................... 16
Relay Mounting.................................................................................................................................................. 18
Circuit Board Jumpers.................................................................................................................................... 29
Accessing the Relay Main Board (All Models) and Extra I/O Board (Models 0300G_1 and 0300G_Y)....... 29
Output Contact Jumpers .................................................................................................................................. 32
“Extra Alarm” Output Contact Control Jumper .............................................................................................. 33
Password and Breaker Jumpers....................................................................................................................... 34
EIA-232 Serial Port Voltage Jumpers ............................................................................................................. 34
Specifications .................................................................................................................................................... 35
Differential Element Commissioning Worksheet ................................................................................. 41
Check List......................................................................................................................................................... 42
Plot Phasors ..................................................................................................................................................... 42

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Date Code 20170804 Quick-Start Guide SEL-300G Relay
List of Tables
Table 1 Communication Cables to Connect the SEL-300G Relay to Other Devices ............................ 4
Table 2 SET Command Editing Keystrokes ......................................................................................... 7
Table 3 SEL-300G Relay Contact I/O Viewed by the TAR Command ............................................... 10
Table 4 Serial Port Commands That Clear Relay Data Buffers .......................................................... 11
Table 5 Serial Port Command Summary.............................................................................................. 12
Table 6 Output Contact Jumpers and Corresponding Output Contacts ............................................... 33
Table 7 “Extra Alarm” Output Contacts and Corresponding Controlling Jumpers............................. 33
Table 8 Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation (All
Models)................................................................................................................................ 33
Table 9 Password and Breaker Jumper Positions for Standard Relay Shipments................................ 34
Table 10 Password and Breaker Jumper Operation ............................................................................... 34
Table 11 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments ...................... 34

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Date Code 20170804 Quick-Start Guide SEL-300G Relay
List of Figures
Figure 1 Relay Commissioning Flowchart (refer to text for detailed instructions)................................. 2
Figure 2 DC Supply Polarity, Continuity Checks....................................................................................3
Figure 3 SEL-300G to Computer—C227A and C234A.......................................................................... 5
Figure 4 Three-Phase AC Connection Test Voltage Signals.................................................................. 8
Figure 5 Open-Delta AC Potential Connection Test Voltage Signals.................................................... 9
Figure 6 SEL-300G Front-Panel Pushbuttons—Overview.................................................................... 14
Figure 7 SEL-300G Front-Panel Pushbuttons—Primary Functions...................................................... 15
Figure 8 SEL-300G Front-Panel Pushbuttons—Primary Functions (continued) .................................. 16
Figure 9 SEL-300G Front-Panel Pushbuttons—Secondary Functions.................................................. 17
Figure 10 SEL-300G Dimensions and Panel-Mount Cut-Out................................................................. 18
Figure 11 SEL-300G Relay Front-Panel Drawings for Rack-Mount Relays
(2U and 3U), Screw-Terminal Block and Connectorized Versions ..................................... 19
Figure 12 SEL-300G Relay Front-Panel Drawings for Panel-Mount Relays
((2U and 3U), Screw-Terminal Block and Connectorized Versions.................................... 20
Figure 13 SEL-300G0 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Screw-Terminal Block Version...................................................................... 21
Figure 14 SEL-300G1 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Screw-Terminal Block Version...................................................................... 22
Figure 15 SEL-300G2 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Screw-Terminal Block Version...................................................................... 23
Figure 16 SEL-300G3 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Screw- Terminal Block Version..................................................................... 24
Figure 17 SEL-300G0 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Connectorized Version .................................................................................. 25
Figure 18 SEL-300G1 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Connectorized Version .................................................................................. 26
Figure 19 SEL-300G2 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Connectorized Version .................................................................................. 27
Figure 20 SEL-300G3 Rear-Panel Drawings for Rack- and Panel-Mount Relays
(2U and 3U), Connectorized Version .................................................................................. 28
Figure 21 Jumper, Connector, and Major Component Locations on the SEL-300G Main Board (All
Models)................................................................................................................................ 30
Figure 22 Jumper, Connector, and Major Component Locations on the SEL-300G Extra I/O
Board (Models 0300G_1, Screw-Terminal Block Version)................................................. 31
Figure 23 Jumper, Connector, and Major Component Locations on the SEL-300G Extra I/O Board
(Model 0300G_Y, Plug-In Connector Version) ................................................................... 32

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Date Code 20170804 Quick-Start Guide SEL-300G Relay
Preface
Overview
What This Guide Contains
The SEL-300G Relay Quick-Start Installation Guide is designed to help you
do the following:
➤Install the SEL-300G according to wiring diagrams you
provide.
➤Enter relay settings according to settings sheets for your
application.
➤Perform commissioning checkouts to ensure the relay is
correctly connected.
Serial port command and front-panel operation summaries, information on
relay circuit board jumpers, a cut and drill plan, and relay front- and rear-panel
drawings are also included.
To use this guide successfully, you need the information and tools referred to
in Required Equipment on page 1.
Obtain an SEL-300G Relay Instruction Manual
To obtain a copy of the SEL-300G Relay Instruction Manual, simply contact
the factory using the information provided in Factory Assistance. The
SEL-300G Relay Instruction Manual contains additional details on relay
operation and settings calculations.
Safety Information The SEL-300G Relay Quick-Start Installation Guide does not cover all of the
possible conditions or circumstances that can occur during the installation of
the SEL-300G. If you need additional information to install or communicate
with the SEL-300G Relay, please refer to the SEL-300G Relay Instruction
Manual or contact SEL for assistance.
Danger, Warnings, and Cautions
There are three types of hazard statements in this guide.
DANGER
Indicates an imminently hazardous situation
that, if not avoided, will result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation
that, if not avoided, could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation
that, if not avoided, may result in minor or
moderate injury or equipment damage.

viii
SEL-300G Relay Quick-Start Guide Date Code 20170804
Preface
Safety Information
Safety Symbols
The following symbols are often marked on SEL products.
Safety Marks
The following statements apply to this device.
CAUTION
Refer to accompanying documents.
ATTENTION
Se reporter à la documentation.
Earth (ground) Terre
Protective earth (ground) Terre de protection
Direct current Courant continu
Alternating current Courant alternatif
Both direct and alternating current Courant continu et alternatif
Instruction manual Manuel d’instructions
General Safety Marks
For use in Pollution Degree 2 environment. Pour l'utilisation dans un environnement de Degré de Pollution 2.
Other Safety Marks (Sheet 1 of 2)
CAUTION
Be sure to follow the generator and prime mover manufacturers'
guidelines with respect to generator operation and
commissioning.
ATTENTION
Suivez attentivement les instructions des manufacturiers de la turbine et
de la génératrice pour la réception, la mise en route et l'opération.
CAUTION
Do not apply reverse polarity dc voltage or ac voltage to terminals
Z25 and Z26 of SEL-300G Relays rated for 24/48 Vdc applications.
Relay failure and permanent power supply damage will result from
application of reverse polarity dc voltage to relays rated for 24/48
Vdc applications.
ATTENTION
N'appliquer pas un voltage CC avec polarité inversée ou un voltage CA, sur
les bornes Z35 et Z26 des relais 300G dont la tension d'alimentation
nominale est 24/48 VCC. Une perte de fonctionnement du relais et un bris
permanent de l'alimentation résulteraient de l'application d'une polarité
CC inversée sur un relais avec tension nominale de 24/48 VCC.
CAUTION
Standard SEL relay output contacts are rated to make and carry
trip coil current, but are not rated to interrupt trip coil current. Do
not exceed the contact interrupt ratings shown in the General
Specifications.
ATTENTION
Les contacts standards des relais SEL ont la capacité de fermer sur le
courant spécifié des bobines d'ouverture mais ne peuvent ouvrir sur le
même courant. Il est important de ne pas dépasser les capacités des
contacts indiquées an paragraphe Spécifications Générales.
CAUTION
The relay contains devices sensitive to electrostatic discharge
(ESD). When working on the relay with front or top cover removed,
work surfaces and personnel must be properly grounded or
equipment damage may result.
ATTENTION
Le relais contient des pièces sensibles aux décharges électrostatiques.
Quand on travaille sur le relais avec les panneaux avant ou du dessus
enlevés, toutes les surfaces et le personnel doivent être mis à la terre
convenablement pour éviter les dommages à l'équipement.
WARNING
Have only qualified personnel service this equipment. If you are
not qualified to service this equipment, you can injure yourself or
others, or cause equipment damage.
AVERTISSEMENT
Seules des personnes qualifiées peuvent travailler sur cet appareil. Si vous
n’êtes pas qualifiés pour ce travail, vous pourriez vous blesser avec
d’autres personnes ou endommager l’équipement.

ix
Date Code 20170804 Quick-Start Guide SEL-300G Relay
Preface
Factory Assistance
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.
2350NEHopkins Court
Pullman, WA99163-5603 U.S.A.
Tel: [phone]
Fax: [phone]
Internet: selinc.com/support
Email: [email protected]
WARNING
This device is shipped with default passwords. Default passwords
should be changed to private passwords at installation. Failure to
change each default password to a private password may allow
unauthorized access. SEL shall not be responsible for any damage
resulting from unauthorized access.
AVERTISSEMENT
Cet équipement est expédié avec des mots de passe par défaut. A
l'installation, les mots de passe par défaut devront être changés pour des
mots de passe confidentiels. Dans le cas contraire, un accès non-autorisé à
l'équipement pourrait être possible. SEL décline toute responsabilité pour
tout dommage résultant de cet accès non-autorisé.
WARNING
Use of this equipment in a manner other than specified in this
manual can impair operator safety safeguards provided by this
equipment.
AVERTISSEMENT
L’utilisation de cet appareil suivant des procédures différentes de celles
indiquées dans ce manuel peut désarmer les dispositifs de protection
d’opérateur normalement actifs sur cet équipement.
DANGER
Removal of relay front panel exposes circuitry which may cause
electrical shock that can result in injury or death.
DANGER
Le retrait du panneau avant expose à la circuiterie qui pourrait être la
source de chocs électriques pouvant entraîner des blessures ou la mort.
DANGER
Contact with this circuitry may cause electrical shock that can
result in injury or death.
DANGER
Le contact avec la circuiterie peut causer un choc électrique pouvant
entraîner des blessures ou la mort.
DANGER
Contact with instrument terminals may cause electrical shock
which can result in injury or death.
DANGER
Le contact avec les bornes de l' instrument peut causer un choc électrique
pouvant entraîner des blessures ou la mort.
Other Safety Marks (Sheet 2 of 2)

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1
Date Code 20170804 Quick-Start Guide SEL-300G Relay
Relay Commissioning Procedure
Introduction
Relay Commissioning Procedure
Introduction The procedure below is intended to help you enter settings into an SEL-300G
and verify that the relay is properly connected. Steps later in the procedure call
for operation of the protected generator at no load, light load, and full load to
verify ac connections and take measurements for calculation of 100% stator
ground fault protection elements.
This procedure is intended for use at initial relay installation and should not
need to be repeated in the life of the relay unless major changes are made to
the relay electrical connections.
This procedure is intended as a guideline. Modify this procedure as necessary
to conform with your standard practices and the operating and commissioning
guidelines published by the generator and prime mover manufacturers.
Required Equipment ➤SEL-300G Relay, installed and connected according to your
protection design.
➤PC with serial port, terminal emulation software, and serial
communication cable (for relay setting entry).
➤SEL-300G Settings Sheets, filled out with settings appropriate
to your generator protection application and protection cabinet
design.
➤AC and dc elementary schematics and wiring diagrams for this
relay installation.
➤Continuity tester.
➤DC voltmeter.
➤Protective relay ac test source:
Minimum: Single-phase voltage plus single-phase current with
ability to control phase angle between signals.
Preferred: Two- or three-phase voltage plus three-phase current
with ability to control phase angle between signals.
CAUTION
Be sure to follow the generator and
prime mover manufacturers’
guidelines with respect to generator
operation and commissioning.

2
SEL-300G Relay Quick-Start Guide Date Code 20170804
Relay Commissioning Procedure
Commissioning Procedure
Commissioning
Procedure
Figure 1 Relay Commissioning Flowchart (refer to text for detailed instructions)
STEP 8
Connect PC
to Relay
STEP 7
Energize
Relay
STEP 5
Contact Output
DC Polarity
Checks
STEP 4
Power Supply
DC Polarity
Checks
(See Fig 7.6)
STEP 3
Modify Circuit
Board Jumpers
STEP 2
AC & DC
Continuity
Checks
STEP 1
Remove DC
Power
STEP 6
Remove AC
Signals
STEP 16
Confirm
Tripping
Settings
STEP 15
Perform
Protection
Element Tests
STEP 13
Verify Contact
Input Operation
STEP 12
Verify AC
Wiring
(See Fig 3 & 4)
STEP 11
Enter Relay
Settings
STEP 10
Configure
Emulation
Software
STEP 9
Run Emulation
Software
STEP 14
Verify Contact
Output
Operation
STEP 18
Operate
Generator at
No Load
STEP 17
Connect Relay
for Tripping
Duty
STEP 19
Operate
Generator at
10% Load
Record
No Load
Third-Harmonic
Voltages
STEP 23
Clear Relay
Data Buffers
STEP 22
Calculate and
Enter 64G
Element Settings
STEP 21
Shut Down
Generator
Correct
Current
Connections
Shut Down
Generator
STEP 20
Operate Generator
at Full Load.
Record Third
Harmonic
Voltages.
Correct
Voltage
Connections
Are Current
Signals Correct?
Are Voltage
Signals Correct?
Are 64G Element
Settings Final?
Start
End
Yes
Yes
Yes
No
No
No

3
Date Code 20170804 Quick-Start Guide SEL-300G Relay
Relay Commissioning Procedure
Commissioning Procedure
Step 1. Ensure that dc power is removed from the SEL-300G dc
circuits by opening the appropriate dc breaker or removing dc
fuses.
Step 2. Verify the accuracy and correctness of the ac and dc
connections by performing point-to-point continuity checks on
the circuits associated with the SEL-300G Relay.
Step 3. Make any necessary modifications to the relay output contact
jumper positions, password or breaker command jumper
positions. Refer to Circuit Board Jumpers for additional details
and instructions on how to access and modify these jumpers.
Step 4. Using a voltmeter, check the polarity of dc voltage on the
energized side of the dc circuit breaker or fuse block that
isolates the SEL-300G dc power supply inputs, terminals Z25
and Z26. Refer to Figure 2. Verify continuity between the
positive, low-side terminal of the breaker or fuse block and
terminal Z25 marked “+.” Verify continuity between the
negative, low-side terminal of the breaker or fuse block and
terminal Z26 marked “-.” This step is important because the
SEL-300G 24/48 Vdc power supply is polarity sensitive.
Figure 2 DC Supply Polarity, Continuity Checks
Step 5. Select models of the SEL-300G_1 or SEL-300G_Y are
equipped with polarity sensitive, high current interrupting
output contacts. When the relay is so equipped, it will have +
polarity marks above even-numbered terminals in the B-series,
such as B02, B04, etc. If your relay output contacts include
CAUTION
Do not apply reverse polarity dc
voltage or ac voltage to terminals
Z25 and Z26 of SEL-300G Relays
rated for 24/48 Vdc applications.
Relay failure and permanent power
supply damage will result from
application of reverse polarity dc
voltage to relays rated for 24/48 Vdc
applications
DWG: M300G103
SEL-300G Relay
(Partial)
ohms
com
0.0 ohms
To Battery
Bank
+ DC
com
+Vdc
DC fuse block
(or DC circuit
breaker) with
fuses removed.
1
2 3
1
2
3
Z26Z25
Verify correct DC
polarity at fuse
block input.
Verify continuity
from fuse block +dc
to relay +dc power
supply terminal Z25.
Verify continuity
from fuse block –dc
to relay –dc power
supply terminal Z26.
NOTE: If an output contact is
polarity marked, do not use it to
switch ac control signals. If an output
contact is not polarity marked, it is not
polarity sensitive and can be
connected with either terminal at the
higher potential.

4
SEL-300G Relay Quick-Start Guide Date Code 20170804
Relay Commissioning Procedure
Commissioning Procedure
polarity marks, review your dc wiring diagrams to ensure that
even-numbered terminals are applied at a higher potential than
odd-numbered terminals in their dc circuits.
Step 6. In preparation to energize and set the relay, remove ac signals
from the relay and isolate its tripping contacts.
Step 7. Energize the relay by closing the dc breaker or installing the dc
fuses. Within a moment of energizing the relay, the green
enable LED (EN) on the front panel should illuminate, and the
relay self-test ALARM contact (A15, A16) should open (type b
contact).
Step 8. Connect the PC to the relay using the appropriate serial cable.
Refer to Ta ble 1 for typical cable numbers. These cables are
available directly from SEL or you can build your own cable
using the cable pinout shown in the SEL-5801 Cable Selector
Software. This software is available from SEL, or can be
downloaded free of charge from the SEL website at http://
www.selinc.com.
Serial Port 1 on all the SEL-300G models is an EIA-485 port
(4-wire). The Serial Port 1 plug-in connector accepts wire size
AWG 24 to 12. Strip the wires 0.31 inches (8 mm) and install
with a small slotted-tip screwdriver. Serial Port 1 connector has
extra positions for IRIG-B time-code signal input.
All EIA-232 ports accept 9-pin D-subminiature male
connectors. Port 2 on all the SEL-300G models also accepts
demodulated IRIG-B time-code signal input.
Refer to Ta ble 1 for a list of cables available from SEL for
various communication applications.
For example, to connect any EIA-232 port to the 9-pin male
connector on a laptop computer, order cable number C234A
and specify the length needed (standard length is eight feet).
For connecting devices at distances over 100 feet, SEL offers
fiber-optic transceivers. The SEL-2800 family of transceivers
provides fiber-optic links between devices for electrical
isolation and long-distance signal transmission. Contact SEL
for further information on these products.
NOTE: Listing of devices not
manufactured by SEL in Table 1 is for
the convenience of our customers.
SEL does not specifically endorse or
recommend such products, nor does
SEL guarantee proper operation of
those products, or the correctness of
connections, over which SEL has no
control.
Table 1 Communication Cables to Connect the SEL-300G Relay to Other Devices (Sheet 1 of 2)
SEL-300G EIA-232 Serial
Ports Connect to Device (Gender Refers to the Device) SEL Cable #
all EIA-232 ports PC, 25-Pin Male (DTEa) C227A
all EIA-232 ports Laptop PC, 9-Pin Male (DTEa) C234A
all EIA-232 ports SEL Communications Processors without IRIG-B C272A
2 SEL Communications Processors with IRIG-B C273A
all EIA-232 ports SEL-PRTU C231
2 SEL-IDM, Ports 2 through 11 C254 + C257
2b
3b
Dial-up modem, 5 Vdc Powered C220
all EIA-232 ports Standard modem, 25-Pin Female (DCEc)C222
all EIA-232 ports RFL-9660 C245A

5
Date Code 20170804 Quick-Start Guide SEL-300G Relay
Relay Commissioning Procedure
Commissioning Procedure
Figure 3 SEL-300G to Computer—C227A and C234A
Step 9. SEL relays respond to ASCII text commands entered on the
relay serial port. PC terminal emulation packages and many
other packages allow ASCII commands to be sent from the PC
serial port and relay responses displayed. Start your PC and run
the appropriate terminal emulation software.
Step 10. Configure the terminal emulation software to operate the PC-
COM port (COM1, COM2, etc.) at the relay baud rate (factory
default 2400 baud), using 8 data bits, 1 stop bit, no parity bit,
All EIA-232 ports (with SEL-2800
transceiver)
SEL-2600 Series RTD Module C805Z010VVX0003 (3 meters)d
All EIA-232 ports (with
SEL-2812MR transceiver)
SEL-2664 Field Ground Module SEL C805 Multimode 200 µm core
diameter fiber-optic cable with ST
connectors, or SEL C807 Multimode
62.5 µm core diameter fiber-optic
cable with ST connectors
aData Terminal Equipment.
bA corresponding main board jumper must be installed to power the dial-up modem with +5 Vdc (0.5 A limit) from the SEL-300G. See
Figure 20 and Table 11.
cData Communication Equipment.
dRefer to the Model Option Table for additional cable choices.
Table 1 Communication Cables to Connect the SEL-300G Relay to Other Devices (Sheet 2 of 2)
SEL-300G EIA-232 Serial
Ports Connect to Device (Gender Refers to the Device) SEL Cable #
HINT: For the best display, use
VT-100 terminal emulation or the
closest variation.
NOTE: Commands you type appear
in bold/uppercase: OTTER.
Computer keys you press appear in
bold/uppercase/brackets: <ENTER>.

6
SEL-300G Relay Quick-Start Guide Date Code 20170804
Relay Commissioning Procedure
Commissioning Procedure
and XON/XOFF flow control. Refer to the terminal emulation
package documentation or HELP function for assistance in
making these PC communications port configuration settings.
With the terminal emulation software active at the terminal
screen, you should see an =prompt appear on the screen after
you press the <Enter> or <Return> key on the PC keyboard.
The =prompt is the relay indication that it is communicating at
Access Level 0. Relay settings are entered at Access Level 2.
Commands can be issued to the relay via the serial port to view
metering values, change relay settings, etc. The available serial
port commands are listed in Table 4. The commands can be
accessed only from the corresponding access level as shown in
Table 4. The access levels are:
For more information on a particular command, type HELP
cmd <Enter>, where cmd is the name of the command you are
interested in.
Passwords are required to move up in access levels if the main
board Password jumper is not in place (Password jumper =
OFF). Passwords are not required if the main board Password
jumper is in place (Password jumper = ON). Refer to Table 8
and Table 9 for Password jumper information.
The factory default passwords for Access Levels 1, B, 2 and C are:
At the Access Level 0 prompt, enter the ACC command:
= ACC <Enter>
If the Password jumper is not in place, the relay asks for the
Access Level 1 password to be entered:
Password: ? @@@@@@
The relay is shipped with the default Access Level 1 password
shown above. Enter the default password and press <Enter>.
The “=>” prompt indicates the relay is now in Access Level 1.
If the entered password is incorrect, the relay asks for the
password again (Password: ?). The relay will ask up to three
times. If the requested password is incorrectly entered three
times, the relay closes the ALARM contact for one second and
remains at Access Level 0 (“=” prompt).
Access Level 0 (the lowest access level)
Access Level 1
Access Level B
Access Level 2 (the highest access level)
Access Level C (restricted access level; should be
used under the direction of SEL only)
HINT: Use the HELP command at
any Access Level to get a list of
available serial port commands.
Access Level Factory-Default Password
1 OTTER
BEDITH
2TAIL
CCLARKE
WARNING
This device is shipped with default
passwords. Default passwords should
be changed to private passwords at
installation. Failure to change each
default password to a private
password may allow unauthorized
access. SEL shall not be responsible
for any damage resulting from
unauthorized access.

7
Date Code 20170804 Quick-Start Guide SEL-300G Relay
Relay Commissioning Procedure
Commissioning Procedure
If the Password jumper is in place, the relay does not ask for a
password; it goes directly to Access Level 1.
The previous two examples demonstrate how to go from
Access Level 0 to Access Level 1. The procedure to go from
Access Level 1 to Access Level B, Access Level 1 to Access
Level 2, or Access Level B to Access Level 2 is much the same,
with command BAC or 2AC entered at the access level screen
prompt. Access Level C can be accessed from Access Level 2
with the CAL command. The relay closes the ALARM contact
for one second after a successful Level B, Level 2, or Level C
access. If access is denied, the ALARM contact closes for one
second.
Enter the 2AC command at the Access Level 1 prompt:
=>2AC <Enter>
If the password jumper is not in place, enter the factory-default
Access Level 2 password.
Step 11. Using the SET 1, SET 2, SET G, SET R, and SET P
commands, enter relay settings according to the Settings Sheets
for your application.
When you issue the SET command, the relay presents a list of
settings, one at a time. Enter a new setting, or press <Enter> to
accept the existing setting. Editing keystrokes are shown in
Table 2.
The relay checks each entry to ensure that it is within the
setting range. If it is not, an “Out of Range” message is
generated, and the relay prompts for the setting again.
When all the settings are entered, the relay displays the new
settings and prompts for approval to enable them. Answer Y
<Enter> to enable the new settings. If changes are made to
Global, SER, or Port settings, the relay is disabled while it
saves the new settings. If changes are made to the Group
settings for the active setting group, the relay is disabled while
it saves the new settings. The ALARM contact closes
momentarily and the EN LED extinguishes while the relay is
disabled. The relay is disabled for as long as 15 seconds.
If changes are made to the Group settings for the inactive
setting group, the relay is not disabled while it saves the new
settings. The ALARM contact closes momentarily, but the EN
LED remains on while the new settings are saved.
Table 2 SET Command Editing Keystrokes
Press Key(s) Results
<ENTER> Retains setting and moves to the next setting.
^<ENTER> Returns to previous setting.
< <ENTER> Returns to previous setting category.
><ENTER> Moves to next setting category.
END <ENTER> Exits editing session, then prompts you to save the
settings.
<CTRL> XAborts editing session without saving changes.

8
SEL-300G Relay Quick-Start Guide Date Code 20170804
Relay Commissioning Procedure
Commissioning Procedure
If pickup settings for 100% stator ground element 64G2 have
not been calculated, leave Relay Word bit 64G2T out of
tripping control equations. Set the Breaker Monitor function
SELOGIC®control equation enable BKMON = 0 in the Global
relay settings. This disables the Breaker Monitor function while
the relay is being tested.
Step 12. Verify relay ac connections. Connect the protective relay ac test
signal source to the SEL-300G through the ac protection
cabinet wiring. (You may connect directly to the relay, however
this does not verify the accuracy of the wiring in the protection
cabinet.) Apply rated ac voltage (67 V1n, 120 V11) and current
(1 A or 5 A) to the relay phase voltage and current inputs. Set
the test source phase angles to supply no phase difference
between phase voltage and phase current.
If a three-phase test source is used, set the source phase angles
as shown in Figure 4:
Figure 4 Three-Phase AC Connection Test Voltage Signals
If open-delta potentials are used, set the test source phase
angles as shown in Figure 5.
+120°
–120°
VC
VBVC
VA
PHROT := ABC
+120°
–120°
PHROT := ACB
VB
VA
When setting PHROT := ABC, set angle VA= angle IA= 0°
set angle VB= angle IB= —120°
set angle VC= angle IC= 120°
When setting PHROT := ACB, set angle VA= angle IA= 0°
set angle VB= angle IB= 120°
set angle VC= angle IC= —120°