Schweitzer Engineering Laboratories SEL-300G User manual

SEL-300G
Multifunction Generator
Relay
Instruction Manual
20060731
*PM300G-01-NB*

!
CAUTION: Be sure to follow the generator and
prime mover manufacturers’
g
uidelines with res
p
ect 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
Rela
y
s rated for 24/48 Vdc a
pp
lications. Rela
y
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’a
pp
li
q
uer
p
as un volta
g
e CC avec
p
olarité
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 Relay
Specifications and Options.
!
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 du Relais et
Options.
!
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.
!
CAUTION: S
y
nchronism checkin
g
re
q
uirements and
p
ractices var
y
widel
y
for different
p
rime mover t
yp
es.
Be sure to consult your prime mover manufacturer’s
synchronism checking guidelines as you prepare these
settings or severe equipment damage or loss of
equipment life may result.
!
ATTENTION: Les exigences et les pratiques de
vérification de synchronisme peuvent varier beaucoup selon
les types de turbine. Avant de préparer ces réglages, il faut
analyser les directives du fabricant de turbine concernant la
vérification de synchronisme, pour éviter tout dommage
important ou altération de la vie utile d’équipement.
!
CAUTION: There is danger of explosion if the
battery is incorrectly replaced. Replace only with
Ray-O-Vac
®
no. BR2335 or equivalent recommended
by manufacturer. Dispose of used batteries according
to the manufacturer’s instructions.
!
ATTENTION: Il y a un danger d’explosion si la pile
électrique n’est pas correctement remplacée. Utiliser
exclusivement Ray-O-Vac
®
No. BR2335 ou un équivalent
recommandé par le fabricant. Se débarrasser des piles
usagées suivant les instructions du fabricant.
!
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 appareil 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: 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.
© 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. PM300G-01

Date Code 20060731 Table of Contents i
SEL-300G Instruction Manual
SEL-300G INSTRUCTION MANUAL
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS
SECTION 2: RELAY ELEMENT SETTINGS
SECTION 3: AUXILIARY FUNCTION SETTINGS
SECTION 4: SEL
OGIC CONTROL EQUATIONS
SECTION 5: INSTALLATION
SECTION 6: ENTER RELAY SETTINGS
SECTION 7: RELAY COMMISSIONING
SECTION 8: MONITORING AND METERING FUNCTIONS
SECTION 9: FRONT-PANEL OPERATION
SECTION 10: SERIAL PORT COMMUNICATIONS AND COMMANDS
SECTION 11: EVENT REPORTS AND SER FUNCTIONS
SECTION 12: MAINTAIN AND TROUBLESHOOT RELAY
SECTION 13: DIFFERENTIAL ELEMENT SETTINGS
SECTION 14: APPENDICES
Appendix A: Firmware and Manual Versions
Appendix B: Firmware Upgrade Instructions
Appendix C: SEL Distributed Port Switch Protocol
Appendix D: Configuration, Fast Meter, and Fast Operate
Commands
Appendix E: Compressed ASCII Commands
Appendix F: Modbus RTU Communications Protocol
Appendix G:
AC SEL ERATOR QuickSet SEL-5030 Software
Appendix H: Differential Connection Diagrams
SECTION 15: SEL-300G RELAY COMMAND SUMMARY

SEL-300G Instruction Manual Date Code 20060731
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS......................1-1
Overview.......................................................................................................................................1-1
Instruction Manual Sections Overview ........................................................................................1-2
Typographic Conventions.............................................................................................................1-4
SEL-300G Relay Models..............................................................................................................1-4
SEL-300G Relay Protection Applications....................................................................................1-6
Complete Generator Primary Protection............................................................................... 1-6
Feature-Rich Generator Backup Protection..........................................................................1-7
Protection for Small- and Medium-Sized Machines.............................................................1-7
Solidly Grounded Machine Protection .................................................................................1-8
Thermal Protection of Generator and Prime Mover .............................................................1-8
Field Ground Protection of Generator ..................................................................................1-8
SEL-300G Relay Generator Protection Features..........................................................................1-9
SEL-300G Relay Additional Features ........................................................................................1-10
Contact I/O Application..............................................................................................................1-10
Available Contact Input/Output Options ............................................................................1-10
Power Supply and Optoisolated Input DC Voltages...........................................................1-11
Serial Communication Connections (typical).............................................................................1-12
SEL-5801 Cable Selector Software .................................................................................... 1-13
Relay Specifications and Options...............................................................................................1-13
General................................................................................................................................1-13
Processing Specifications ...................................................................................................1-15
Relay Element Setting Ranges and Accuracies ..................................................................1-15
TABLES
Table 1.1: SEL-300G Relay Instruction Manual Task Map ..................................................................1-1
Table 1.2: SEL-300G Relay Models......................................................................................................1-4
Table 1.3: SEL-300G Relay Hardware Models.....................................................................................1-5
Table 1.4: SEL-300G Requirements for Field Ground Protection Functionality..................................1-9
FIGURES
Figure 1.1: Large Generator Primary and Backup Protection................................................................. 1-6
Figure 1.2: Generator Differential Zone May Include Transformer....................................................... 1-7
Figure 1.3: Simple Protection for Resistance Grounded Generators......................................................1-7
Figure 1.4: Generator Thermal Protection With SEL-2600 Series RTD Module and SEL-300G ......... 1-8
Figure 1.5: Field Ground Protection With the SEL-300G Relay............................................................1-9
Figure 1.6: SEL-300G Relay Communication Connection Examples.................................................. 1-12

Introduction and Specifications 1-1
SEL-300G Instruction Manual Date Code 20060731
SECTION 1: INTRODUCTION AND SPECIFICATIONS
O VERVIEW
This instruction manual covers the SEL-300G Relay family. This manual contains the
information you need to select, set, install, test, operate, and maintain any SEL-300G Relay. You
probably will not need to review the whole book to perform the specific tasks for which you are
responsible. Table 1.1 should help you refer to the best SEL-300G Relay Instruction Manual
section for the tasks you need to perform.
Table 1.1: SEL-300G Relay Instruction Manual Task Map
Task Refer to Instruction Manual Sections
Select a Relay Model Section 1: Introduction and Specifications;
SEL 300G Relay Models
Design the Installation Section 5: Installation; Example AC and DC
Connection Diagrams
Appendix H: Differential Connection Diagrams
Calculate Relay Element Settings Section 2: Relay Element Settings
Section 13: Differential Element Settings
Section 6: Enter Relay Settings; Setting Sheets
Create SEL OGIC
®
Control Equations
Settings, Tripping, Closing, and
Synch-Check Settings
Section 4: SEL
OGIC Control Equations
Create Demand Meter, DC Monitor,
Setting Group Selection, Breaker
Monitor, and Sequential Events
Recorder (SER) Function Settings
Section 3: Auxiliary Function Settings
Install the Relay Section 5: Installation
Section 7: Relay Commissioning
Enter Relay Settings Section 6: Enter Relay Settings
Section 9: Front-Panel Operation
Section 10: Serial Port Communications and
Commands
Commission Test the Relay Section 7: Relay Commissioning
Operate the Relay Section 8: Monitoring and Metering Functions
Section 9: Front-Panel Operation
Section 11: Event Reports and SER Functions
Section 12: Maintain and Troubleshoot Relay

1-2 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
I NSTRUCTION M ANUAL S ECTIONS O VERVIEW
The following is an overview of the other sections in this instruction manual:
Section 2: Relay Element Settings describes the relay generator protection elements, their
logic and operating characteristics, and the calculation of their settings.
Section 3: Auxiliary Function Settings describes the operation and settings of:
• Demand meter function
• Station dc monitor function
• Setting group selection function
• Breaker monitor function
• Optoisolated input debounce timers
• SER trigger and alias settings
Section 4: SEL
OGIC Control Equations describes the operation of:
• SEL
OGIC control equations
• Latch control switches
• General trip logic and generator tripping, with examples
• Close logic
• Synchronism checking function
• Local and remote control switches
• Front-panel display configuration
• Inadvertent energization settings
• Protection alarms
• Relay self-test alarms
• Breaker failure protection
• Tables detailing all Relay Word bits, their definitions and applications
Section 5: Installation describes:
• How to mount and wire the SEL-300G
• Connections for numerous applications
• Explanation of circuit board jumpers
• SEL-300G front- and rear-panel drawings
Section 6: Enter Relay Settings explains:
• How to enter settings via the serial ports or front panel.
• Contains Settings Sheets for general relay, SEL
OGIC control equation, global, SER,
and serial port settings. The Settings Sheets are single-sided and can be photocopied
and filled out to set the SEL-300G. Note that these sheets correspond to the serial
port SET commands listed in Table 6.1.
Section 7: Relay Commissioning describes:
• Commissioning test philosophy and detailed procedure
• Detailed protection element test procedures

Introduction and Specifications 1-3
SEL-300G Instruction Manual Date Code 20060731
Section 8: Monitoring and Metering Functions describes the operation of:
• Generator operating statistics function
• Breaker monitor
• Differential metering
• Station dc battery monitor function
• Energy and maximum/minimum metering
Section 9: Front-Panel Operation explains how to enter settings and also contains the
following setting reference information:
• Front-panel target LEDs
• Front-panel pushbuttons and correspondence to serial port commands
• Local control switches (local bit outputs LB1 through LB8)
• Rotating default displays
Section 10: Serial Port Communications and Commands describes:
• Serial port connector pinout/terminal functions
• Communications cables
• Communications protocol
• Serial port commands
Section 11: Event Reports and SER Functions describes:
• Standard 15-, 30-, 60-, and 180-cycle event reports
• Sequential Events Recorder (SER) report
• Synchronism checking reports
Section 12: Maintain and Troubleshoot Relay describes:
• Relay maintenance testing philosophy
• Relay troubleshooting
Section 13: Differential Element Settings describes:
• Generator differential protection elements
• Logic and operating characteristics
• Settings calculation
Appendices contains the following appendices:
• Appendix A: Firmware and Manual Versions
• Appendix B: Firmware Upgrade Instructions
• Appendix C: SEL Distributed Port Switch Protocol
• Appendix D: Configuration, Fast Meter, and Fast Operate Commands
• Appendix E: Compressed ASCII Commands
• Appendix F: Modbus RTU Communications Protocol
• Appendix G:
AC SEL ERATOR QuickSet SEL-5030 Software
• Appendix H: Differential Connection Diagrams
SEL-300G Relay Command Summary briefly describes the serial port commands that are
described in detail in Section 10: Serial Port Communications and Commands.

1-4 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
T YPOGRAPHIC C ONVENTIONS
• In this manual, commands you type appear in bold/uppercase: OTTER.
• Computer keys you press appear in bold/brackets: <Enter>.
• Examples of relay serial port command responses look like:
=>
• Examples of information that can appear in the relay front-panel LCD display look like:
GEN SHUTDOWN ←→
Position: RETURN
• Sections of this instruction manual are shown in bold italics: Section 1: Introduction and
Specifications.
SEL-300G R ELAY M ODELS
This instruction manual covers the following SEL-300G models:
Table 1.2: SEL-300G Relay Models
Model
Synch-
Check
Differential
Protection
SEL-2600 Series
Compatible
Modbus
®
Protocol Voltage Inputs Current Inputs
0300G0 No 87N No Optional VA, VB, VC, VN
or
VAB, VCB, VN
IA, IB, IC, IN
0300G1 No 87 Optional Optional VA, VB, VC, VN
or
VAB, VCB, VN
IA, IB, IC, IN
IA87, IB87,
IC87
0300G2 Yes 87N Optional Optional VA, VB, VC, VN, VS
or
VAB, VCB, VN, VS
IA, IB, IC, IN
0300G3 Yes 87 Optional Optional VA, VB, VC, VN, VS
or
VAB, VCB, VN, VS
IA, IB, IC, IN
IA87, IB87,
IC87

Introduction and Specifications 1-5
SEL-300G Instruction Manual Date Code 20060731
Table 1.3: SEL-300G Relay Hardware Models
Model
Mounting
Type
Rack Unit
Height (I/O)
a
Rear-Panel
Connection
Type
Output
Contact
Type
Reference
Figures
0300G_0H Rack 2U 6/8 screw-terminal
block
standard 5.1, 5.2,
5.4–5.7
0300G_03 Panel 2U 6/8 screw-terminal
block
standard 5.1, 5.3,
5.4–5.7
0300G_1H Rack 3U 6/8 screw-terminal
block
standard 5.1, 5.2,
5.4–5.7
8/12 screw-terminal
block
standard or
high current
interrupting
0300G_13 Panel 3U 6/8 screw-terminal
block
standard 5.1, 5.3,
5.4–5.7
8/12 screw-terminal
block
standard or
high current
interrupting
0300G_WH Rack 2U 6/8 Connectorized
®
standard 5.1, 5.2,
5.8–5.11
0300G_W3 Panel 2U 6/8 Connectorized standard 5.1, 5.3,
5.8–5.11
0300G_YH Rack 3U 6/8 Connectorized standard 5.1, 5.2,
5.8–5.11
8/12 Connectorized standard or
high current
interrupting
0300G_Y3 Panel 3U 6/8 Connectorized standard 5.1, 5.3,
5.8–5.11
8/12 Connectorized standard or
high current
interrupting
a
Number of Optoisolated Input/Output Contacts
The model numbers in Table 1.2 and Table 1.3 are only part of the actual ordering number—
enough to distinguish one model type from another. To obtain the appropriate relay ordering
number, see the latest SEL-300G Model Option Table at www.selinc.com, under SEL Literature,
Ordering Information (Model Option Table).
Throughout this instruction manual, when differences among the SEL-300G models in Table 1.3
are explained, model numbers are referenced for clarity.

1-6 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
SEL-300G R ELAY P ROTECTION A PPLICATIONS
Complete Generator Primary Protection
When ordered with the optional differential elements, the SEL-300G provides a full complement
of primary protection elements for large machines. The relay is built on the field-proven
SEL-300 Series Relay platform, known for secure, dependable, high-performance protection.
DWG: M300G028
SEL-387
Unit Differential
SEL-300G1
Primary
SEL-300G0
Backup
∠
or
Figure 1.1: Large Generator Primary and Backup Protection
In these applications, three- or four-wire potentials and three-phase currents are applied to the
relay for principal protection and metering functions. When differential protection is included,
three additional phase current measurements are required.
Neutral voltage for 100 percent stator ground protection is taken from the secondary of the
grounding transformer. The SEL-300G neutral voltage input is rated for application up to
300 Vac, which means that, for most applications, an auxiliary voltage transformer will not be
necessary between the grounding transformer secondary and this relay.
In applications where neutral overcurrent protection is desired, the SEL-300G neutral current
input, IN, may be connected to the secondary of a neutral current transformer. This transformer
may be located in the generator neutral or connected in the secondary circuit of the grounding
transformer. In solidly grounded or resistance grounded applications, the SEL-300G0 and
SEL-300G2 Relays offer ground differential (87N) protection.

Introduction and Specifications 1-7
SEL-300G Instruction Manual Date Code 20060731
Feature-Rich Generator Backup Protection
When purchased without the differential elements, the SEL-300G makes a perfect backup relay
for large machines. The relay offers 100 percent stator ground fault protection, over- and
underexcitation detection, and reverse-power protection in an inexpensive, integrated relay.
Frequency elements, voltage-restrained overcurrent elements, and a host of other elements and
functions round out the package.
DWG: M300G029
SEL-300G0
Unit Backup
SEL-300G3 Unit
Protection Plus
Synch-Check
∠
or
Figure 1.2: Generator Differential Zone May Include Transformer
Protection for Small- and Medium-Sized Machines
With or without the differential elements, you get large-machine protection, monitoring, and
control that is priced for application on nearly any size machine. The SEL-300G offers you the
freedom to benefit from integrated protection, SER and event reporting, high-accuracy metering,
and breaker and dc monitoring functions without the installation and maintenance expense of
purchasing those components individually.
DWG: M300G030
SEL-300G2
Optional
Synch-Check
Input
∠
or
Figure 1.3: Simple Protection for Resistance Grounded Generators
In resistance-grounded machine protection applications, 100 percent stator ground fault coverage
may be obtained by connecting a properly rated voltage transformer to the machine neutral point
and applying the secondary voltage to the SEL-300G neutral voltage input, VN.

1-8 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
Solidly Grounded Machine Protection
The SEL-300G is suitable to protect solidly grounded machines, with the exception that the relay
does not provide 100 percent stator ground fault protection for these machines. Phase, negative-
sequence, and neutral overcurrent fault detection methods, plus optional differential overcurrent
protection, are provided. Abnormal operating condition protection, such as loss-of-field,
antimotoring, and overexcitation protection, is also provided.
Thermal Protection of Generator and Prime Mover
The SEL-300G models compatible with the SEL-2600 Series RTD Module (refer to Table 1.2 for
model number detail) provide Thermal Protection for the Generator and Prime Mover. The RTD
types and locations are individually configurable. Either ambient temperature or generator load
current can be configured to bias the winding RTD trip temperature thresholds.
SEL-2600
Series
SEL-300G
Relay
Generator Prime
Mover
Fiber-Optic Port
(built into SEL-2600
Series)
(SEL-2800 plugged on
to any DB-9 connector)
As many as 12 RTD inputs,
plus one contact
DWG: M300G258b
Up to 500 meters via single fiber-optic cable, SEL
part number C805Z010VVX0003 (3 meters)
(Refer to the Model Option Table for additional
cable choices.)
Figure 1.4: Generator Thermal Protection With
SEL-2600 Series RTD Module and SEL-300G
Field Ground Protection of Generator
The SEL-300G works with the SEL-2664 Field Ground Module to provide field ground
protection for the generator field winding. Two different pickup levels of the insulation
resistance are available for configuration. The Field Ground Protection elements (64F) Relay
Word bits can be programmed into an output contact for alarm or into the Trip equation for
tripping. The protection covers a range of high-resistance as well as low-resistance ground faults
(from 0.5 to 200 kilohms).
SEL-300G Requirements for SEL-2664 Application
If the Field Ground Protection functionality is to be added to an existing SEL-300G installation,
use Table 1.4 to determine the requirements:

Introduction and Specifications 1-9
SEL-300G Instruction Manual Date Code 20060731
Table 1.4: SEL-300G Requirements for Field Ground Protection Functionality
Existing SEL-300G Recommended Actions for SEL-2664 Application
Firmware version R1xx Consult factory for a new replacement SEL-300G
Firmware version R2xx Consult factory for hardware upgrade or new replacement
SEL-300G
Firmware version R3xx Order Firmware Conversion kit from factory to field upgrade
firmware to R323 or later
EIA-232 Serial Port 2 or Port 3
availability
EIA-232 Port 2 or Port 3 availability is required to connect the
SEL-2664 to the SEL-300G, using a fiber-optic cable and
SEL-2812MR Transceiver
SEL-2664
Field Ground
Module
SEL-300G
Generator
Relay
FIELD
(+)
FIELD
(-)
FIELD
(GND)
SEL-2812MR
Fiber-Optic
Transceiver
Fiber-Optic
Port (ST)
Fiber-Optic
cable with ST
connectors
a
+
-
Exciter
(Vdc)
Rotor
Iron
Field
Breakers
Brushes
Field
Winding
a
Refer to the Model Option Table for cable choices.
Figure 1.5: Field Ground Protection With the SEL-300G Relay
SEL-300G R ELAY G ENERATOR P ROTECTION F EATURES
The SEL-300G offers a full range of elements for generator protection, such as:
• Optional Percentage Restrained Differential Protection (included in SEL-0300G1 and
SEL-0300G3 models)
• Optional 87N Ground Differential Protection (included in SEL-0300G0 and SEL-0300G2
models)
• 100 Percent Stator Ground Detection (for high-impedance and resistance grounded
generators)
• Reverse/Low-Forward Power Elements
• Volts/Hertz Elements for Overexcitation Protection
• Loss-of-Field Protection
• Negative-Sequence Overcurrent Protection
• Voltage-Restrained Phase Time-Overcurrent Elements
• Voltage-Controlled Phase Time-Overcurrent Elements

1-10 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
• Backup Phase or Compensator Distance Elements
• Neutral Overcurrent Elements
• Under- and Overvoltage Elements for Protection and Control
• Loss-of-Potential Logic
• Optional Synchronism Checking (included in SEL-0300G2 and SEL-0300G3 models)
• Flexible Inadvertent Energization Detection
• Secure Under- and Overfrequency Protection, Plus Off-Fundamental Time Accumulators per
IEEE C37.106-1987
• Breaker Failure Protection
• Out-of-Step Protection (single and double blinder schemes)
• Thermal Protection (included in models compatible with SEL-2600 Series RTD Module).
• Field Ground Protection (optional when an SEL-300G Relay is used in combination with an
SEL-2664 Field Ground Module).
SEL-300G R ELAY A DDITIONAL F EATURES
In addition to the protection functions outlined above, the SEL-300G offers advanced measuring
and monitoring capabilities not found on other generator relays.
• Extensive High-Accuracy Metering Capabilities
• Configurable Front-Panel Display Replaces Separate Panel Meters
• Event Report and SER Reporting
• Advanced SEL
OGIC Control Equations
• Contact Inputs and Outputs
• Breaker Monitor
• Station Battery Monitor
• Two Independent Setting Groups
C ONTACT I/O A PPLICATION
Available Contact Input/Output Options
The SEL-300G is available in several hardware configurations. These configurations are
differentiated by the following:
• Chassis size (2U or 3U)
• Mounting type (panel or rack)
• Type of connections at the rear (Screw-Terminal Block or Connectorized)
• Number of optoisolated inputs
• Number of contact outputs
Relay Models SEL-0300G_0H, SEL-0300G_03, SEL-0300G_WH, and SEL-0300G_W3
The relays listed above provide seven programmable output contacts, plus a self-test ALARM
contact and six optoisolated inputs in a two-rack unit package. All output contacts are rated to

Introduction and Specifications 1-11
SEL-300G Instruction Manual Date Code 20060731
make and carry trip coil current per the requirements of IEEE C37.90-1989. These contacts are
not rated to interrupt trip coil current.
Relay Models SEL-0300G_1H, SEL-0300G_13, SEL-0300G_YH, and SEL-0300G_Y3
The relays listed above provide 19 programmable output contacts, plus a self-test ALARM
contact and 14 optoisolated inputs in a three-rack unit package. All output contacts are rated to
make and carry trip coil current per the requirements of IEEE C37.90-1989. Seven of the output
contacts are not rated to interrupt trip coil current. Twelve of the output contacts may be
purchased with high current interruption output contacts for applications requiring up to 10 A
inductive interrupt capability.
Note: High current interrupting output contacts are polarity sensitive. Observe polarity
markings by connecting even-number screw terminals to the higher voltage potential in
the circuit. Do not use high current interrupting output contacts to switch ac control
signals.
High Current Interrupting Output Contacts
SEL-300G purchased with the additional I/O board may be further specified to include high
current interrupting output contacts. These contacts use an integrated-gate bipolar junction
transistor to interrupt contact current in a controlled manner. This increases the contact interrupt
rating, prevents contact arcing, and prevents the inductive voltage spike which occurs when an
inductive current is interrupted by a standard contact.
Refer to the High current interruption option on page 1-14 for detailed specifications of the
high current interrupting output contacts.
Note: High current interrupting output contacts are polarity sensitive. Observe polarity
markings by connecting even-number screw terminals to the higher voltage potential in
the circuit. Do not use high current interrupting output contacts to switch ac control
signals.
Power Supply and Optoisolated Input DC Voltages
The SEL-300G is available in power supply configurations 125/250 V, 48/125 V,
or 24/48 V.
Optoisolated inputs are available with the voltage ratings of 250, 220, 125, 110, 48, or 24 Vdc.
Both the power supply and the optoisolated input voltage ratings are selected when the relay is
ordered. Refer to the Optoisolated Inputs on page 1-14 for detailed specifications.

1-12 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
S ERIAL C OMMUNICATION C ONNECTIONS ( TYPICAL )
Front Panel
SEL Communications
Processor
Rear Panel
SEL-300G Relay (#2)
Front Panel
Rear Panel
SEL-300G Relay (#1)
Front Panel
SEL-300G Relay
(#1)
Computer
PORT 2
SEL-300G
Relay
SEL-300G
Relay
SEL
Communications
Processor
SEL-300G
Relay
SEL
Communications
Processor
SEL-300G Relay
(#2)
SEL-300G Relay
(#32)
DATA AND TIME-SYNCHRONIZATION CONNECTIONS
PORT 2
Fiber-Optic
Cable
#C273AFZ
or #C273AF0 SEL-2810
Optical Cable ConnectionMetallic Cable Connection
EIA-485 CONNECTIONS
PORT 1 PORT 1 PORT 1
LOCAL CONNECTIONS
Connect to the SEL
Communications Processor
once and communicate with
any connected SEL Relay
PORT 2PORT 2
PORT FPORT F
or . . .
Connect to the SEL-300G
Relays individually via the
Front-Panel Serial Port
DWG: M300G031a
(METALLIC)
Cable #C273A
Figure 1.6: SEL-300G Relay Communication Connection Examples

Introduction and Specifications 1-13
SEL-300G Instruction Manual Date Code 20060731
SEL-5801 Cable Selector Software
While you can view or modify many relay settings using the front-panel LCD interface, SEL
OGIC
control equations to control relay contact outputs must be entered via a relay serial port using a
PC, terminal emulation software, and appropriate communication cable. The relay also supports
communication with other local devices such as modems, port switches, and the
SEL-2032/SEL-2030/SEL-2020 Communications Processors.
Communication with these external devices requires appropriate cable. Some of the most
common cables are called out in Figure 1.6. Use the SEL-5801 Cable Selector Software,
available free of charge from SEL, to determine the SEL cable part number to connect with other
specific devices. You can purchase cables from SEL or refer to the cable pinout provided by the
software and build your own.
To obtain your copy of SEL-5801 Cable Selector Software, contact your SEL Representative, or
download it directly from our website at http://www.selinc.com.
R ELAY S PECIFICATIONS AND O PTIONS
General
Terminal Connections:
Tightening Torque
Terminal Block: Minimum: 8 in-lb (0.9 Nm)
Maximum: 12 in-lb (1.4 Nm)
Connectorized: Minimum: 4.4 in-lb (0.5 Nm)
Maximum: 8.8 in-lb (1.0 Nm)
Terminals or stranded copper wire. Ring terminals are
recommended. Minimum temperature rating of 105°C.
AC Current Inputs:
5 A Nominal
15 A continuous, linear to 100 A symmetrical.
500 A for 1 second.
1250 A for 1 cycle.
Burden: 0.27 VA @ 5 A
2.51 VA @ 15 A
1 A Nominal
3 A continuous, linear to 20 A symmetrical
100 A for 1 second.
250 A for 1 cycle.
Burden: 0.13 VA @ 1 A
1.31 VA @ 3 A
AC Voltage Inputs:
80–208 V
L-L
Nominal, for 4-wire wye voltage input.
80–140 V
L-L
Nominal, for 3-wire delta voltage input.
300 V
L-N
continuous limit for 3-phase, 4-wire wye-connection.
300 V
L-L
continuous limit for 3-phase, 3-wire delta-connection.
300 V continuous, V
N–NN
neutral voltage input.
300 V continuous, V
S–NS
synch voltage input.
365 Vac for 10 seconds.
Burden: 0.13 VA @ 67 V
0.45 VA @ 120 V
0.80 VA @ 300 V
Power Supply:
125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
Burden: < 25 W
48/125 Vdc or 125 Vac
Range: 38–200 Vdc or 85–140 Vac
Burden: < 25 W
24/48 Vdc
Range: 18–60 Vdc polarity dependent
Burden: < 25 W
Output Contacts:
Standard
Make: 30 A
Carry: 6 A @ 70°C
4 A @ 85°C
1 s Rating: 50 A
MOV: 270 Vac, 360 Vdc, 40 J
Pickup Time: < 5 ms
Dropout Time: < 8 ms, typical
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
Breaking Capacity
(10,000 operations):
250 V 0.20 A L/R = 40 ms
24 V 0.75 A L/R = 40 ms
48 V 0.50 A L/R = 40 ms
125 V 0.30 A L/R = 40 ms
Cyclic Capacity
(2.5 cycles/second):
250 V 0.20 A L/R = 40 ms

1-14 Introduction and Specifications
Date Code 20060731 SEL-300G Instruction Manual
High Current Interruption Option:
Make: 30 A
Carry: 6 A @ 70°C
4 A @ 85°C
MOV: 330 Vdc, 130 J
Pickup time: < 5 ms
Dropout time: < 8 ms, typical
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
Breaking Capacity
(10,000 operations):
250 V 10 A L/R = 20 ms
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
Cyclic Capacity
(4 cycles in 1 second,
followed by 2 minutes
idle for thermal
dissipation):
250 V 10 A L/R = 20 ms
Note: Do not use high current interrupting output contacts to
switch ac control signals. These outputs are polarity
dependent.
Note: Make per IEEE C37.90-1989; Breaking and Cyclic
Capacity per IEC 60255-23:1994.
Optoisolated Inputs:
250 Vdc: Pickup 200–300 Vdc
Dropout 150 Vdc
220 Vdc: Pickup 176–264 Vdc
Dropout 132 Vdc
125 Vdc: Pickup 105–150 Vdc
Dropout 75 Vdc
110 Vdc: Pickup 88–132 Vdc
Dropout 66 Vdc
48 Vdc: Pickup 38.4–60 Vdc
Dropout 28.8 Vdc
24 Vdc: Pickup 15.0–30 Vdc
Note: 24, 48, 125, 220, and 250 Vdc optoisolated inputs dra
w
approximately 5 mA of current and 110 Vdc inputs draw
approximately 8 mA of current. All current ratings are at
nominal input voltages.
Frequency and Rotation:
System Frequency: 60 or 50 Hz
Phase Rotation: ABC or ACB
Frequency Tracking
Range: 20–70 Hz
Note: V
A
required for frequency tracking.
Communications Ports:
EIA-232: 1 front and 2 rear
EIA-485: 1 rear
Baud rate: 300–38400
Time-Code Input:
Relay accepts demodulated IRIG-B time-code input at Port 2.
Relay time is synchronized to within ±5 ms of time-source
input.
Dimensions:
See Figure 5.1 for exact relay dimensions.
Operating Temperature:
–40°to +85°C (–40°to +185°F)
Note: LCD contrast impaired for temperatures below –20°C.
Weight:
2U Rack Unit: Minimum: 13.5 lbs (6.2 kg)
Maximum: 15 lbs (6.8 kg)
3U Rack Unit: Minimum: 16.5 lbs (7.5 kg)
Maximum: 18.5 lbs (8.4 kg)
Certifications:
ISO: Relay is designed and manufactured using ISO-9001
certified quality program.
UL/CSA: UL listed to UL-508 and CSA certified to
C22.2 No.14-95.
CE: Mark (available only in screw-terminal block version).
Type Tests:
Cold: IEC 60068-2-1:1990
[EN 60068-2-1:1993],
Test Ad; 16 hr @ –40°C
Dry Heat: IEC 60068-2-2:1974
[EN 60068-2-2:1993],
Test Bd; 16 hr @ +85°C
Damp Heat,
Cyclic:
IEC 60068-2-30:1980, Test Db; 25° to
55°C, 6 cycles, 95% humidity
Dielectric
Strength:
IEC 60255-5:2000, IEEE C37.90-1989,
2500 Vac on analogs, contact inputs, and
contact outputs; 3100 Vdc on power
supply; 2200 Vdc on EIA-485
communications port. Type tested for 1
minute.
Impulse: IEC 60255-5:2000, 0.5 J, 5000 V
Vibration: IEC 60255-21-1:1988
[EN 60255-21-1:1995],
Class 1 Endurance, Class 2 Response
Shock and Bump: IEC 60255-21-2:1988
[EN 60255-21-2:1995], Class 1 Shock
Withstand, Class 2 Shock Response
Seismic: IEC 60255-21-3:1993
[EN 60255-21-3:1995], Class 2
1 MHz Burst
Disturbance:
IEC 60255-22-1:1988, Class 3 (2500 V
common and differential mode)
Emissions: IEC 60255-25:2000
Conducted Radio
Frequency:
ENV 50141:1993 10 V/m,
IEC 61000-4-6:1996
[EN 61000-4-6:1996]
10 V/m, IEC 60255-22-6:2001 10 V/m
Digital Radio
Telephone RF:
ENV 50204:1995 10 V/m at
900 MHz and 1.89 GHz
Electrostatic
Discharge:
IEC 60255-22-2:1996
[EN 60255-22-2:1996],
IEC 61000-4-2:1995
[EN 61000-4-2:1995],
Level 1,2,3,4
IEEE C37.90.3-2001 Severity: 2, 4, 8 kV
Contact: 4, 8, 15 kV air