Sel SEL-300G Instruction Manual

20060731
SEL-300G Relay
Multifunction
Generator Relay
Quick-Start
Installation Guide
*PM300GQS-01*
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

SEL-300G Relay Instruction Manual Date Code 20060731
© 1998–2006 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 US 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 manual is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language manual.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact your customer service
representative.
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

SEL-300G Generator Relay
Quick-Start
Installation Guide
BCS Switchgear Inc.
Switchgear | Circuit Breakers | Parts | Tech Support
bcsswitchgear.com | 888.599.0486
Need Help? 888.599.0486

!
CAUTION:Be sure to follow the generator and prime mover
manufacturers’ guidelines with respect to generator operation
and commissioning.
!
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.
!
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 General Specifications on page 39.
!
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.
!
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.
!
DANGER: Removal of relay front panel exposes circuitry
which may cause electrical shock that can result in injury or
death.
!
DANGER: Contact with this circuitry may cause electrical
shock that can result in injury or death.
!
DANGER: Contact with instrument terminals may cause
electrical shock which can result in injury or death.
!
ATTENTION! Suivez attentivement les instructions des
manufacturiers de la turbine et de la génératrice pour la
réception, la mise en route et l'opération.
!
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.
!
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 à la
page 39.
!
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.
!
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.
!
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: Le contact avec la circuiterie peut causer un choc
électrique pouvant entraîner des blessures ou la mort.
!
DANGER: Le contact avec les bornes de l' instrument peut
causer un choc électrique pouvant entraîner des blessures
ou la mort.

SEL-300G Relay Quick-Start Installation Guide i
TABLE OF CONTENTS
INTRODUCTION............................................................................................................. 1
What This Manual Contains ............................................................................................................ 1
To Obtain an SEL-300G Relay Instruction Manual ........................................................................ 1
Factory Assistance ........................................................................................................................... 1
Safety Information ........................................................................................................................... 1
RELAY COMMISSIONING PROCEDURE...................................................................... 2
Introduction...................................................................................................................................... 2
Required Equipment ........................................................................................................................ 2
Commissioning Procedure............................................................................................................... 3
SERIAL PORT COMMAND SUMMARY ....................................................................... 14
FRONT-PANEL PUSHBUTTON OPERATION............................................................. 16
Overview........................................................................................................................................ 16
Primary Functions.......................................................................................................................... 16
Front-Panel Password Security...................................................................................................... 17
Secondary Functions...................................................................................................................... 18
RELAY MOUNTING...................................................................................................... 20
CIRCUIT BOARD JUMPERS ....................................................................................... 31
Accessing the Relay Main Board (All Models) and Extra I/O Board (Models 0300G_1
and 0300G_Y)........................................................................................................................ 31
Output Contact Jumpers ................................................................................................................ 35
“Extra Alarm” Output Contact Control Jumper ............................................................................ 35
Password and Breaker Jumpers ..................................................................................................... 36
EIA-232 Serial Port Voltage Jumpers ........................................................................................... 37
SPECIFICATIONS ........................................................................................................ 39
General................................................................................................................................... 39
Processing Specifications ...................................................................................................... 41
Relay Element Setting Ranges and Accuracies ..................................................................... 41
DIFFERENTIAL ELEMENT COMMISSIONING WORKSHEET ................................... 46
Check List ...................................................................................................................................... 47
Plot Phasors ................................................................................................................................... 47

ii SEL-300G Relay Quick-Start Installation Guide
TABLES
Table 1: Communication Cables to Connect the SEL-300G Relay to Other Devices ............................ 6
Table 2: SET Command Editing Keystrokes .......................................................................................... 9
Table 3: SEL-300G Relay Contact I/O Viewed by the TAR Command............................................... 12
Table 4: Serial Port Commands That Clear Relay Data Buffers........................................................... 14
Table 5: Serial Port Command Summary.............................................................................................. 15
Table 6: Output Contact Jumpers and Corresponding Output Contacts ............................................... 35
Table 7: “Extra Alarm” Output Contacts and Corresponding Controlling Jumpers............................. 35
Table 8: Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation
(All Models) ............................................................................................................................ 36
Table 9: Password and Breaker Jumper Positions for Standard Relay Shipments ............................... 36
Table 10: Password and Breaker Jumper Operation ............................................................................... 37
Table 11: EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments...................... 37
FIGURES
Figure 1: Relay Commissioning Flowchart (refer to text for detailed instructions) ................................ 3
Figure 2: DC Supply Polarity, Continuity Checks ................................................................................... 4
Figure 3: Three-Phase AC Connection Test Voltage Signals ................................................................ 10
Figure 4: Open-Delta AC Potential Connection Test Voltage Signals................................................... 11
Figure 5: SEL-300G Front-Panel Pushbuttons – Overview ................................................................... 16
Figure 6: SEL-300G Front-Panel Pushbuttons – Primary Functions...................................................... 17
Figure 7: SEL-300G Front-Panel Pushbuttons – Primary Functions (continued) .................................. 18
Figure 8: SEL-300G Front-Panel Pushbuttons – Secondary Functions ................................................. 19
Figure 9: SEL-300G Dimensions and Panel-Mount Cut-Out................................................................. 20
Figure 10: SEL-300G Relay Front-Panel Drawings for Rack-Mount Relays (2U and 3U),
Screw-Terminal Block and Connectorized
®
Versions ............................................................ 21
Figure 11: SEL-300G Relay Front-Panel Drawings for Panel-Mount Relays (2U and 3U),
Screw-Terminal Block and Connectorized Versions .............................................................. 22
Figure 12: SEL-300G0 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Screw-Terminal Block Version ...................................................................................... 23
Figure 13: SEL-300G1 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Screw-Terminal Block Version ...................................................................................... 24
Figure 14: SEL-300G2 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Screw-Terminal Block Version ...................................................................................... 25
Figure 15: SEL-300G3 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Screw-Terminal Block Version ...................................................................................... 26
Figure 16: SEL-300G0 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Connectorized Version.................................................................................................... 27
Figure 17: SEL-300G1 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Connectorized Version.................................................................................................... 28
Figure 18: SEL-300G2 Relay Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and
3U), Connectorized Version.................................................................................................... 29
Figure 19: SEL-300G3 Rear-Panel Drawings for Rack- and Panel-Mount Relays (2U and 3U),
Connectorized Version............................................................................................................ 30
Figure 20: Jumper, Connector, and Major Component Locations on the SEL-300G Main Board
(All Models) ............................................................................................................................ 32
Figure 21: Jumper, Connector, and Major Component Locations on the SEL-300G Extra I/O
Board(Models 0300G_1, Screw-Terminal Block Version) .................................................... 33
Figure 22: Jumper, Connector, and Major Component Locations on the SEL-300G Extra I/O
Board (Model 0300G_Y, Plug-In Connector Version)........................................................... 34

Introduction
SEL-300G Relay Quick-Start Installation Guide 1
INTRODUCTION
What This Manual Contains
The SEL-300G Relay Quick-Start Installation Guide is designed to help
you
• 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 in the Relay Commissioning
Procedure section of this guide.
To Obtain an SEL-300G Relay Instruction Manual
To obtain a copy of the SEL-300G Relay Instruction Manual, simply
contact the factory using the instructions below. The SEL-300G Relay
Instruction Manual contains additional details on relay operation and
settings calculations.
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 USA 99163-5603
Telephone: [phone]
Fax: [phone]
Internet: www.selinc.com
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.

Relay Commissioning Procedure
2 SEL-300G Relay Quick-Start Installation Guide
There are two types of hazard statements in this guide:
CAUTION :indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury or equipment damage.
WARNING :indicates an imminently hazardous situation which, if not
avoided, will result in serious injury or death.
R ELAY 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.
CAUTION :Be sure to follow the generator and prime mover
manufacturers’ guidelines with respect to generator operation and
commissioning.
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.
!

Relay Commissioning Procedure
SEL-300G Relay Quick-Start Installation Guide 3
Commissioning Procedure
DWG: M300G211
Correct Voltage
Connections
STEP17
ConnectRelayfor
TrippingDuty
STEP 18
Operate Generator
at No Load
STEP19
OperateGenerator
at10%Load
AreVoltage
SignalsCorrect?
Record No Load
Third-Harmonic
Voltages
AreCurrent
SignalsCorrect?
Correct Current
Connections
STEP8
ConnectPCto
Relay
STEP 14
Verify Contact
Output Operation
STEP15
PerformProtection
ElementTests
STEP16
ConfirmTripping
Settings
STEP 1
Remove DC
Power
Start
STEP 2
AC & DC
Continuity Checks
STEP 4
Power Supply DC
Polarity Checks
(See Fig 2)
STEP 5
Contact Output DC
Polarity Checks
STEP 6
Remove AC
Signals
STEP 7
Energize Relay
ShutDown
Generator
STEP20
OperateGenerator
atFullLoad.Record
Third-Harmonic
Voltages
STEP21
ShutDown
Generator
STEP22
Calculateand
Enter64G
ElementSettings
STEP23
ClearRelay
DataBuffers
Are64GElement
SettingsFinal?
End
Yes
No
Yes
No
Yes
No
STEP 3
Modify Circuit
Board Jumpers
STEP 9
Run Emulation
Software
STEP 10
Configure
Emulation
Software
STEP13
VerifyContact
InputOperation
STEP12
VerifyACWiring
(SeeFig3&4)
STEP11
EnterRelay
Settings
Figure 1: Relay Commissioning Flowchart (refer to text for detailed instructions)

Relay Commissioning Procedure
4 SEL-300G Relay Quick-Start Installation Guide
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.
!
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 Verify correct
DC polarity at
fuse block input.
2 Verify continuity
from fuse block
+dc to relay +dc
power supply
terminal Z25.
3 Verify continuity
from fuse block
-dc to relay -dc
power supply
terminal Z26.
Z26Z25
Figure 2: DC Supply Polarity, Continuity Checks

Relay Commissioning Procedure
SEL-300G Relay Quick-Start Installation Guide 5
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 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 Table 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 World Wide Web
site 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 Table 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
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 hi
g
her
p
otential.
Note
Listing of devices not manu-
factured by SEL in Table 1 is
for the convenience of our
customers. SEL does not spe-
cifically endorse or recommend
such products, nor does SEL
guarantee proper operation o
f
those products, or the correct-
ness of connections, over
which SEL has no control.

Relay Commissioning Procedure
6 SEL-300G Relay Quick-Start Installation Guide
Table 1: Communication Cables to Connect the
SEL-300G Relay to Other Devices
SEL-300G EIA-232
Serial Ports
Connect to Device
(gender refers to the device) SEL Cable #
all EIA-232 ports PC, 25-Pin Male (DTE
2
) C227A
all EIA-232 ports Laptop PC, 9-Pin Male (DTE
2
) 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
2
1
3
1
StarComm Modem, 5 Vdc Powered C220
all EIA-232 ports Standard Modem, 25-Pin Female
(DCE
3
)
C222
all EIA-232 ports RFL-9660 C245A
All EIA-232 ports (with
SEL-2800 transceiver)
SEL-2600 Series RTD Module C805Z010VVX0003
(3 meters)
4
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
1
A corresponding main board jumper must be installed to power the StarComm Modem with +5
Vdc (0.5 A limit) from the SEL-300G. See Figure 20 and Table 11.
2
Data Terminal Equipment
3
Data Communication Equipment
4
Refer to Model Option Table for additional cable choices.

Relay Commissioning Procedure
SEL-300G Relay Quick-Start Installation Guide 7
SEL-300G to Computer
GND 5
TXD 3
RXD 2
GND 9
CTS 8
7 GND
3RXD
2TXD
1RTS
4CTS
5 GND
6
8
20
SEL-300G Relay
9-Pin Male
“D” Subconnector
Cable C227A
9-Pin DTE Device
25-Pin Female
“D” Subconnector
RXD 2
TXD 3
GND 5
CTS 8
3TXD
2RXD
5 GND
8CTS
7RTS
1DCD
4DTR
6DSR
SEL-300G Relay
9-Pin Male
“D” Subconnector
Cable C234A
9-Pin DTE Device
9-Pin Female
“D” Subconnector
Step 9. SEL relays respond to ASCII text commands entered on the
relay serial port. PC terminal emulation packages such as
Windows
®
HyperTerminal, Procomm
®
Plus, SmartCOM,
CROSSTALK
®
, 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,
and XON/XOFF flow control. Refer to the terminal emulation
package documentation or HELP function for assistance in
making these PC communication 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 5. The
commands can be accessed only from the corresponding
access level as shown in Table 5. The access levels are:
Access Level 0 (the lowest access level)
Access Level 1
Access Level B
Access Level 2 (the highest access level)
For more information on a particular command, type HELP
cmd <Enter>, where cmd is the name of the command you are
interested in.
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/brackets:
<Enter>.
Hint
Use the HELP command at any
A
ccess Level to get a list o
f
available serial
p
ort commands.

Relay Commissioning Procedure
8 SEL-300G Relay Quick-Start Installation Guide
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 9
and Table 10 for Password jumper information.
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.
The factory default passwords for Access Levels 1, B, and 2
are:
Access Level Factory Default Password
1 OTTER
B EDITH
2 TAIL
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).
If the Password jumper is in place, the relay does not ask for a
password; it goes directly to Access Level 1.
The above 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. The relay closes the ALARM contact for one second
after a successful Level B or Level 2 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.
!

Relay Commissioning Procedure
SEL-300G Relay Quick-Start Installation Guide 9
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.
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> X Aborts editing session without saving changes.
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.
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
SEL
OGIC
®
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.

Relay Commissioning Procedure
10 SEL-300G Relay Quick-Start Installation Guide
If a three-phase test source is used, set the source phase angles
as shown in Figure 3:
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°
+120°
-120°
V
C
V
B
V
A
PHROT = ABC
+120°
-120°
PHROT = ACB
DWG: M300G104
V
B
V
C
V
A
Figure 3: Three-Phase AC Connection Test
Voltage Signals
If open-delta potentials are used, set the test source phase
angles as shown in Figure 4:
When setting PHROT = ABC, set angle Ia =0°
set angle Ib = -120°
set angle Ic = 120°
set angle Vab = +30°
set angle Vcb = +90°
When setting PHROT = ACB, set angle Ia = 0°
set angle Ib = 120°
set angle Ic = -120°
set angle Vab = -30°
set angle Vcb = -90°

Relay Commissioning Procedure
SEL-300G Relay Quick-Start Installation Guide 11
DWG: M300G200
60° V
AB
V CB
PHROT = ABC
60°
V
AB
V CB
PHROT = ACB
Figure 4: Open-Delta AC Potential Connection
Test Voltage Signals
If a single-phase source is used, set the source phase angles to
zero and apply the voltage and current to phases A, B, and C
in turn.
Use the front-panel or serial port METER function to verify
that the relay is measuring voltage and current magnitudes and
phase angles correctly, taking into account the relay PTR and
CTR settings and the fact that the quantities are displayed in
primary units.
Apply rated ac voltage (67V) to the relay VS and VN inputs if
provided and used. Apply rated ac current (1 A or 5 A) to the
relay IN input if used. Use the front-panel or serial port
METER function to verify that the relay is measuring voltage
and current magnitudes and phase angles correctly, taking into
account the relay PTRN, PTRS, and CTRN settings and the
fact that the quantities are displayed in primary units.
Step 13. Verify optoisolated input connections. Use the front-panel
OTHER pushbutton and the TAR function to cause the relay
to display Relay Word Row 31 on the relay front-panel LEDs.
Apply rated dc voltage to the individual relay optoisolated
input circuits. As you apply dc voltage to each input, its label
will appear in the LCD display and its LED will illuminate.
Execution of the TAR command via the front-panel display
remaps the bottom row of the front-panel target LEDs (see
Figure 7, pushbutton OTHER).
For instance, the TAR 31 command associates the front-panel
87 LED with input IN101. When rated dc voltage is applied
to IN101, the 87 LED illuminates. Verify inputs IN201
through IN208 of SEL-300G_1 and SEL-300G_Y Relays
using TAR 40. When input verification is complete, press the
TARGET RESET or EXIT pushbutton to reset the front-panel
target LEDs.

Relay Commissioning Procedure
12 SEL-300G Relay Quick-Start Installation Guide
Table 3: SEL-300G Relay Contact I/O Viewed by the TAR Command
TAR 0
(Front-Panel LEDs)
EN BKR
CLOSED
LOP 60 TRIP 21/51V 50 51 N
TAR 1
(Front-Panel LEDs)
24 27/59 32 40 46 64G 81 87
TAR 31 ER OOST IN106 IN105 IN104 IN103 IN102 IN101
TAR 32 ALARM OUT107 OUT106 OUT105 OUT104 OUT103 OUT102 OUT101
TAR 40 IN208 IN207 IN206 IN205 IN204 IN203 IN202 IN201
TAR 42 OUT201 OUT202 OUT203 OUT204 OUT205 OUT206 OUT207 OUT208
TAR 43 OUT209 OUT210 OUT211 OUT212 * * * *
Step 14. Verify relay contact output electrical performance. Use the
front-panel or serial port PULSE command to close individual
relay output contacts. Ensure that each contact operates
properly in its designated annunciation, control, or tripping
circuit.
!
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 General Specifications on
page 39.
Step 15. Perform any desired protection element tests using the
individual element test procedures found in Section 7: Relay
Commissioning of the instruction manual.
Step 16. Execute the serial port Access Level 1 SHOWSET TR1
command. (This command instructs the relay to display active
settings for tripping, event triggering, and output contact
control starting with the TR1 setting.) Confirm that trip
initiation settings TR1 through TR4 are set according to your
Settings Sheets. Confirm that output contacts used in tripping
circuits are set to close when TRIP1, TRIP2, TRIP3, or TRIP4
assert. These tripping bits are typically used individually, one
TRIPnbit per output contact.
Step 17. Connect the relay for tripping duty. If the relay is an
SEL-300G0 model and 100% stator ground element settings
have been finalized, perform Step 18 and Step 19 to verify ac
voltage and current connections, then shut down the generator
and skip to Step 23. To finalize the settings for the relay 100%
stator ground elements, it is necessary to operate the generator
at no load and at full load to measure the terminal and neutral
third-harmonic voltage magnitudes. If 100% stator ground
element settings have not been finalized, perform Step 18
through Step 23.
Step 18. Following the prime mover and generator manufacturers’
guidelines, operate the generator at no load.
!
CAUTION : Be sure to follow the generator and prime
mover manufacturers’ guidelines with respect to
generator operation and commissioning.
Note
Later steps call for the
operation of the generator to
collect data. Be sure to verify
trip circuit operation before the
generator is run. This helps
ensure the relay can operate in
the unlikely event that the relay
detects a generator fault during
initial
g
enerator o
p
eration.
Note
The SEL-300G Relay Instruc-
tion Manual provides a
complete list of relay settings
and instructions for their
calculation.
Note
If the relay reports V1 near
zero and V2 nearly equal to
VA, VB, and VC, or VAB/1.73,
there is a phase rotation
problem. Verify the relay ac
voltage connections and the
relay Global phase rotation
setting, PHROT. A nonzero
3V0 meter value typically
indicates a single-phase
voltage connection problem.
3V0 is not displayed when
relay setting DELTA_Y = D.