Schweitzer Engineering Laboratories SEL-352-1 User manual

SEL-352-1, -2
BREAKER FAILURE RELAY
CONTROL RELAY
DATA RECORDER
INSTRUCTION MANUAL
SCHWEITZER ENGINEERING LABORATORIES
2350 NE HOPKINS COURT
PULLMAN, WA USA 99163-5603
TEL: [phone] FAX: [phone]

!
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 (DES). Quand on travaille sur le
relais avec le panneau avant ou du dessus enlevé, les
surfaces de travail et le personnel doivent être mis à la terre
convenablement pour éviter les dommages à l'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
recommandépar le fabricant. Se débarrasser des piles
usagées suivant les instructions du fabricant.
!
CAUTION: Automated clearing of the event
buffer should be limited to reduce the
possibility of wearing out the nonvolatile
memory. Limit automated HIS C commands
to once per week or less.
!
ATTENTION: Le nombre de suppressions automatiques
de l’information sur les évènements devrait être réduit afin
de ne pas user la mémoire non-volatile. Limiter la
commande automatique HIS C àune opération par semaine
ou moins.
!
CAUTION: Automated clearing of the SER
buffer should be limited to reduce the
possibility of wearing out the nonvolatile
memory. Limit automated SER C commands
to once per week or less.
!
ATTENTION: Le nombre de suppressions automatiques
de l’information sur les SER devrait être réduit afin de ne
pas user la mémoire non-volatile. Limiter la commande
automatique SER C àune opération par semaine ou moins.
!
CAUTION: Automated clearing of the
breaker report should be limited to reduce the
possibility of wearing out the nonvolatile
memory. Limit automated BRE C commands
to once per week or less.
!
ATTENTION: Le nombre de suppressions automatiques
des rapports sur le disjoncteur devrait être réduit afin de ne
pas user la mémoire non-volatile. Limiter la commande
automatique BRE C àune opération par semaine ou moins.
!
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 expédiéavec 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-autoriséà
l'équipement pourrait être possible. SEL décline toute
responsabilitépour tout dommage résultant de cet accès
non-autorisé.
!
DANGER: Removal of this front panel
exposes circuitry which may cause electrical
shock that can result in injury or death.
!
DANGER:Le retrait du panneau avant expose àla
circuiterie qui pourrait être la source de chocs électriques
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.
The software (firmware), schematic drawings, relay commands, and relay messages are copyright protected by the United States
Copyright Law and International Treaty provisions. All rights are reserved.
You may not copy, alter, disassemble, or reverse-engineer the software. You may not provide the software to any third party.
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders.
Schweitzer Engineering Laboratories, SELOGIC, Connectorized, Job Done, SEL-PROFILE, and are registered trademarks of
Schweitzer Engineering Laboratories.
The English language manual is the only approved SEL manual.
Copyright © SEL 1998, 1999, 2000, 2001 (All rights reserved) Printed in USA.
This product is covered by U.S. Patent Numbers: 5,041,737; 5,157,575; 5,317,472; 5,479,315; and 5,914,663 and U.S. Patent(s) Pending.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact your customer
service representative.

Date Code 20010731 Manual Change Information i
SEL-352-1, -2 Instruction Manual
MANUAL CHANGE INFORMATION
The date code at the bottom of each page of this manual reflects the creation or revision date.
Date codes are changed only on pages that have been revised and any following pages affected
by the revisions (i.e., pagination). If significant revisions are made to a section, the date code on
all pages of the section will be changed to reflect the revision date.
Each time revisions are made, both the main table of contents and the affected individual section
table of contents are regenerated and the date code is changed to reflect the revision date.
Changes in this manual to date are summarized below (most recent revisions listed at top).
Revision
Date Summary of Revisions
The Manual Change Information section has been created to begin a record of revisions to
this manual. All changes will be recorded in this Summary of Revisions table.
20010731 Reissued entire manual.
Corrected cross-references throughout to match section name changes and
reordered information.
Section 1: combined with previous Section 3: Specifications; changed name to
Section 1: Introduction and Specifications; removed information regarding
manual fonts, formatting, and objective reading.
Section 3: replaced and renamed to Section 3: Breaker Logic, which includes
Protection Logic and Breaker Alarm Logic from previous Section 4: Relay
Logic and all of previous Section 5: Breaker Failure Applications; reordered
and edited text; added discussion of setting UBLOG, added setting ranges.
Section 4: replaced and renamed to Section 4: Close Logic, which retains
Control Logic from previous Section 4: Relay Logic and all of previous Section
6: Control Relay Applications; reordered and edited text; added a number of
figures and modified others.
Section 5: replaced and renamed to Section 5: Control Logic, which contains
all but Protection Logic,Control Logic,Event Report Trigger, and Breaker
Alarm Logic subsections from previous Section 4: Relay Logic.
Section 6: moved to new Section 4: Close Logic; replaced and renamed to
Section 6: Metering and Monitoring, which contains Breaker Monitor Report,
Breaker Resistor Thermal Report, Metering Report, Status Report, and Relay
Word Bit Report subsections from previous Section 7: Data Recording
Application; dropped the word “Report” from these subsection titles and
changed subsection Status Report to Status Monitor.

ii Manual Change Information Date Code 20010731
SEL-352-1, -2 Instruction Manual
Revision
Date Summary of Revisions
20010731
(continued)
Section 7: moved all but Breaker Monitor Report, Breaker Resistor Thermal
Report, Metering Report, Status Report, and Relay Word Bit Report to new
Section 10: Event Reports and SER, replaced and renamed to Section 7:
Setting the Relay, which contains previous Section 8: Settings; removed
Overview and added Introduction.
Section 8: replaced and renamed to Section 8: Serial Port Communications
and Commands, which contains previous Section 9: Serial Port
Communications.
Section 9: replaced and renamed to Section 9: Front-Panel Interface, which
contains previous Section 10: Front-Panel Interface.
Section 10: replaced and renamed to Section 10: Event Reports and SER,
which contains all but Breaker Monitor Report, Breaker Resistor Thermal
Report, Metering Report, Status Report, and Relay Word Bit Report from
previous Section 7: Data Recording Applications.
20010420 Reverse of the title page: added cautions, warnings, and dangers in English and
French.
Section 1: made typographical corrections.
Section 2: inserted updated dimension, panel-mount cutout, front- and rear-
panel drawings; merged drawings and information from Appendix G: Optional
I/O Board Specifications into this section; added a caution about replacing the
clock battery.
Section 3: updated specifications.
Section 4: reordered some subsections; clarified Limitations of SELOGIC®
Control Equations; corrected Figure 4.53 and Figure 4.54.
Section 6: changed two cross references from Appendix G: Optional I/O Board
Specifications to Section 2: Installation.
Section 8: reordered tables that list the SET settings so they appear in the same
order as in the Settings Sheets; added 50RMS setting under Fault Current
Logic Settings in Table 8.2; added Breaker Monitor Settings in Table 8.3;
added the Distributed Network Protocol (DNP) 3.00 Level 2 Slave settings in
the SET P Settings of the Settings Sheets.
Section 9: added information about DNP; made text changes throughout the
section to advise the user to change default passwords to private, strong
passwords at installation; updated Figure 9.2: Access Level Relationships.
Section 11: made typographical corrections.

Date Code 20010731 Manual Change Information iii
SEL-352-1, -2 Instruction Manual
Revision
Date Summary of Revisions
20010420
(continued)
Appendix A: added firmware that provides the DNP protocol in the SEL-352-2
Relay and makes various corrections; added firmware version that does not
support DNP but makes various corrections in the SEL-352-2 Relay.
Appendix B: added Help screen capture.
Appendix D: added DNP information to A5C0 Relay Definition Block.
Appendix E: corrected formatting error.
Appendix G:
 Renamed appendix Appendix G: Distributed Network Protocol (DNP) 3.00.
 Moved text and drawings about Optional I/O Boards Specifications to
Section 2: Installation.
 Added text and tables explaining DNP 3.00.
Quick Reference:
Deleted Relay Word, Front-Panel Operation Map and Event Report Columns.
20000630 Title page:
 Added U. S. Patent Number 5,041,737 to the reverse of the page.
Section 1:
 Updated the section, including adding a new functional diagram (page 1-
10).
Section 5:
 Updated the section, including adding Figure 5.3 (page 5-3) and replacing
previous Figures 5.5 through 5.9 with Figures 5.6 through 5.10 (pages 5-8
through 5-12).
Section 7:
 Made typographical corrections.
 Added cautionary notes about clearing the event report buffer (page 7-16)
and clearing the Sequential Events Recorder Report (page 7-18).
Section 8 and Settings Sheets:
 Moved Report Settings (SET R) from the end of the Settings Sheets to the
beginning of the Settings Sheets and added explanatory text about setting
aliases.
Section 9:
 Made typographical corrections.
 Added note about taking care when powering down the relay after changing
the date (page 9-21) or time (page 9-44).
 Added note about making Sequential Events Recorder settings with care
(page 9-36).
Appendix A:
 Reformatted the appendix and added firmware SEL-352-1-R103 and
SEL-352-2-R101 which support a battery-backed clock hardware change.

iv Manual Change Information Date Code 20010731
SEL-352-1, -2 Instruction Manual
Revision
Date Summary of Revisions
20000131 Corrected formatting errors in the table of contents for Section 7: Data
Recording Applications and Section 10: Front-Panel Interface.
20000118 Reissued entire manual to add SEL-352-2 Relay firmware option.
Added model variation information to Section 1:Introduction.
Added panel mount figure to Section 2: Installation.
Added SEL-352-2 Relay information to Section 3: Specifications, Section 5:
Breaker Failure Applications, Section 7: Data Recording Applications,
Section 8: Settings, Section 9: Serial Port Communications, Appendix E:
Compressed ASCII Commands, and Appendix F: Relay Word.
Added 110 Vdc level-sensitive input option to Section 3: Specifications and
Appendix G: Optional I/O Board Specifications.
20000104 Appendix A:
 Added Firmware Version SEL-352-1-R102.
990623 Section 3:
 Changed voltage in 59V Setting Range.
Section 4:
 Corrected Figures 4.21 and 4.38.
 Made editorial/typographical corrections.
Section 8:
 Added SET T Command Settings.
 Improved Settings Sheets.
Appendix A:
 Added Firmware Version SEL-352-1-R101.
990224 Section 2:
 Updated Figure 2.10.
 Updated information in Circuit Board Connections subsection.
 Updated information in General Specifications subsection in Section 3:
Specifications.
Appendix G:
 Added Figure G.7 and renumbered figures that followed.
 Added Figure G.18.
 Updated Figure G.3, Figure G.6,Figure G.10,Figure G.13,Figure G.14,
and Figure G.17.
 Added clarifying notes after Figure G.5 and Figure G.16.

Date Code 20010731 Manual Change Information v
SEL-352-1, -2 Instruction Manual
Revision
Date Summary of Revisions
981030 In Section 2: Installation updated Figure 2.1: SEL-352-1 Relay Dimensions,
Panel Cutout, and Drill Plan and Figure 2.5: SEL-352-1 ConnectorizedÉ
Rear Panel (Model 03521Y) to document new current shorting connectors for
Connectorized models.
Update model numbers and correct formatting throughout manual.
980617 Update manual to include hardware changes. Model 03521J, a new 3U, one I/O
board, Connectorized version has been created, employing plug-in connectors
for relay power, ac analog inputs, and dc control inputs/outputs.
980102 New manual for SEL-352-1 Relay was created from last revision of SEL-352
Relay, dated 970820. The SEL-352-1 Relay will replace the SEL-352 Relay as
the standard relay offering.
Performance enhancements installed to create the 352-1 version are as follows:
1. Subsidence current detection logic, to shorten the dropout time of
overcurrent elements.
2. Programmable Display Points and Local Bits, to improve front-
panel displays and functionality.
3. Nonvolatile Latch Bits for SELOGIC control equations, to maintain
bit status when relay is powered down.
4. Threshold compare capability for SELOGIC control equations, to add
magnitude comparisons to the normal Boolean-like logic
expressions.
5. Remote Bit control via the CON n serial port command.

Date Code 20010731 Table of Contents i
SEL-352-1, -2 Instruction Manual
SEL-352-1, -2 INSTRUCTION MANUAL
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS
SECTION 2: INSTALLATION
SECTION 3: BREAKER LOGIC
SECTION 4: CLOSE LOGIC
SECTION 5: CONTROL LOGIC
SECTION 6: METERING AND MONITORING
SECTION 7: SETTING THE RELAY
SECTION 8: SERIAL PORT COMMUNICATIONS AND COMMANDS
SECTION 9: FRONT-PANEL INTERFACE
SECTION 10: EVENT REPORTS AND SER
SECTION 11: TESTING AND TROUBLESHOOTING
APPENDICES
Appendix A: Firmware Versions in This Manual
Appendix B: Firmware Upgrade Instructions
Appendix C: SEL Distributed Port Switch Protocol (LMD)
Appendix D: Configuration, Fast Meter, and Fast Operate
Commands
Appendix E: Compressed ASCII Commands
Appendix F: Relay Word
Appendix G: Distributed Network Protocol (DNP) 3.00
QUICK REFERENCE
Command Summary

Date Code 20010731 Introduction and Specifications i
SEL-352-1, -2 Instruction Manual
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS.................... 1-1
Introduction .................................................................................................................................. 1-1
Instruction Manual Overview....................................................................................................... 1-1
Relay Functions ............................................................................................................................ 1-3
Breaker Failure Detection..................................................................................................... 1-3
Control Features.................................................................................................................... 1-4
Data Recording ..................................................................................................................... 1-4
Additional Features............................................................................................................... 1-4
Model Options .............................................................................................................................. 1-5
SEL-352-1 Relay .................................................................................................................. 1-5
SEL-352-2 Relay .................................................................................................................. 1-5
Conventional Terminal Blocks ............................................................................................. 1-5
Plug-In Connectors (Connectorized®)................................................................................... 1-5
Interface Boards.................................................................................................................... 1-6
Signal Processing Specifications .................................................................................................. 1-6
General Specifications.................................................................................................................. 1-7
Relay Element Specifications..................................................................................................... 1-10
Overcurrent Elements ......................................................................................................... 1-10
Pickup/Dropout Curves....................................................................................................... 1-11
Voltage Elements................................................................................................................1-13
Synchronism Check Element.............................................................................................. 1-13
Current Unbalance Element................................................................................................ 1-14
Overpower Elements........................................................................................................... 1-14
Breaker Resistor Thermal Elements ................................................................................... 1-14
Settable Timers ................................................................................................................... 1-14
Fixed Timers....................................................................................................................... 1-15
Internal Logic Timers ......................................................................................................... 1-15
Metering.............................................................................................................................. 1-16
Multiple Setting Groups...................................................................................................... 1-16
Data Recording Specifications ...................................................................................................1-16
Event Records..................................................................................................................... 1-16
Breaker Monitor Reporting................................................................................................. 1-16
Serial Port Specifications............................................................................................................ 1-17
FIGURES
Figure 1.1: Single-Phase Diagram of AC Inputs to the Relay ................................................................ 1-1
Figure 1.2: Functional Overview ............................................................................................................ 1-3
Figure 1.3: Analog Filter Curve.............................................................................................................. 1-6
Figure 1.4: 50FT Pickup Curves........................................................................................................... 1-11
Figure 1.5: 50FT Dropout Curves......................................................................................................... 1-11
Figure 1.6: 50MN, 50LD, 50MD, 50N Pickup Curves......................................................................... 1-12
Figure 1.7: 50MN, 50LD, 50MD, 50N Dropout Curves ...................................................................... 1-12

Date Code 20010731 Introduction and Specifications 1-1
SEL-352-1, -2 Instruction Manual
SECTION 1: INTRODUCTION AND SPECIFICATIONS
INTRODUCTION
The SEL-352 Relay is a single- or three-pole breaker failure detection, breaker control, and data
recording device. Each of the protection schemes is implemented in SELOGIC®control equations,
giving relay engineers unparalleled flexibility in adapting the relay to their needs. The relay
provides classical overcurrent-based breaker failure protection for a wide variety of breaker
arrangements. Additionally, protection is provided for circuit breaker trip and close resistors, for
current through an open breaker, and for breaker flashover.
Logic to control the closing of the circuit breaker is also included. Additional features include
metering, sequential events reporting, digital fault recording, remote setting capabilities, breaker
operating time monitors, energy interruption monitors, and breaker resistor thermal protection.
Simple hardware design and efficient digital signal processing provide reliability. Extensive self-
testing and communication capabilities enhance availability.
Figure 1.1 shows a single-phase diagram of the ac connections. All nine connections are not
required for most relay functions.
Figure 1.1: Single-Phase Diagram of AC Inputs to the Relay
INSTRUCTION MANUAL OVERVIEW
This instruction manual applies to the SEL-352 Relay. If you are unfamiliar with this relay, we
suggest that you read the following sections in the outlined order.
Section 1: Introduction and Specifications for an introduction, instruction manual overview,
relay functional overview, and specifications.
Section 3: Breaker Logic to learn about predefined SEL-352 Relay logic schemes that provide
protection against several types of circuit breaker failure.
Section 4: Close Logic to understand use of the SEL-352 Relay in implementing automatic and
manual circuit breaker closing.

1-2 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Section 5: Control Logic to understand inputs, the Relay Word, outputs, and logic. Use this
section to understand the settings necessary for implementing your logic.
Section 7: Setting the Relay to understand settings not described in Section 3 through Section 6,
for default settings, and for settings sheets.
Section 8: Serial Port Communications and Commands for a description of the serial port
commands used to set the relay for control, obtain target information, and obtain metering
information, etc.
Section 9: Front-Panel Interface for a description of how to perform the serial port commands
from the front panel.
Section 6: Metering and Monitoring to learn how to retrieve operations data such as metering,
dc battery monitor, breaker monitor, and relay status.
Section 10: Event Reports and SER for a description of event report and sequential events report
generation, event report formats, sequential event reports, and report interpretation.
Section 2: Installation to learn how to configure, install, and wire your relay.
Section 11: Testing and Troubleshooting for test procedures and a troubleshooting guide. You
can use this section as a tutorial to check your understanding of relay operation.

Date Code 20010731 Introduction and Specifications 1-3
SEL-352-1, -2 Instruction Manual
RELAY FUNCTIONS
SEL-352 Relay
37OP50
27
3
52
Undervoltage
59
25
Overvoltage
• Phase
• Neg. Se .
1 or 3
27
Overcurrent
Undervoltage
Current
Unbalance
Synchronism
Check
87V
MMOD
TRIP
1 or 3
46
MMOD
TRIP
i2061 20010205
Motor
Operated
Disconnect
(MOD)
RMS
Overcurrent
62
P
Q
59
Overvoltage
• Phase
• Neg. Se .
P
Q
50
P
G
26
Breaker
Failure
Timer
Synchronism
Check
Current
Unbalance
Overcurrent
• Phase
• Ground
Breaker
Overpower
Voltage
Differential
Insertion
Resistor
Thermal
Event Reports and
Se uential Events Recorder
SELOGIC Control E uations
Remote and Local
Control Switches
Local DisplayLocal Display
Breaker Operation and
Wear Monitors
®
Point-on-Wave Closing
Trapped Line Charge Detection
Flashover Protection
Breaker Isolation Control
Single-Pole
Fail-to-Close Detection
DNP 3.00 Level 2 Slave*
SELOGIC Control E uation
Analog Compares
®
*optional
Figure 1.2: Functional Overview
Breaker Failure Detection
The SEL-352 Relay has five fault current-driven breaker failure detection schemes, including one
specifically designed for ring-bus or breaker-and-a-half applications. Tailor the relay to your
circuit breaker failure detection requirements by selecting the most appropriate scheme or use
SELOGIC control equations to implement your own scheme.
The relay detects failures to interrupt fault, load, or line-charging current. It also detects failure
of breaker poles to complete a close sequence and can detect open breaker flashover failures. If
trip or close resistors remain in service after an operation, the relay detects this failure using a
thermal model.

1-4 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Independent phase current detectors, protection logic, and timers make the relay easy to apply on
both simple systems and more complicated breaker arrangements such as single-pole trip
installations.
The SEL-352 Relay stores summaries of the last 512 breaker operations in nonvolatile memory.
Event type, maximum current, mechanical and electrical operating times, and breaker energy are
stored along with the date and time of operation. Using this breaker history, you can monitor
breaker wear and effectively schedule routine breaker maintenance.
When a motor-operated disconnect switch (MOD) is used with the protected breaker, the
SEL-352 Relay can trip the MOD to isolate the failed breaker when phase current drops below a
value the user can set. When an MOD is not installed, use the MOD logic to indicate a “Safe to
Disconnect”condition to personnel.
The relay also includes SELOGIC control equations, which allow you to configure the
programmable outputs to operate when any of the protective elements pick up. You can
implement complete application-specific protective schemes with a minimum of wiring and panel
space. SELOGIC control equations also simplify relay testing.
Control Features
Control logic provides flexibility for closing and tripping. For minimal breaker wear, the
SEL-352 Relay can be used to close the breaker at an optimum time. Close using a simple pole-
staggered close or use complete control by monitoring synchronism, trapped charge polarity, and
zero crossings. Control breaker tripping through lockout and reset conditions, instantaneous
retripping, and time-delayed retripping.
Use the flexible SELOGIC control equations to create your own recloser, implement manual
closing supervision, and/or change existing control logic to meet your needs.
Data Recording
A wide range of user-selectable events trigger the sequential events recording (SER) and digital
fault recording (DFR) functions, including any input or output assertion. Breaker Failure Trip
(86BFT) output assertion automatically generates a DFR record, and you can set the relay to
trigger an event for CLOSE or TRIP input assertions. This ensures a record of every normal
circuit breaker operation as well as every circuit breaker failure.
The recorded data contain all information needed to determine the cause of relay and breaker
operations. The data collected include current through the circuit breaker, voltage on both sides
of the circuit breaker, input, output, and relay element data. Parameters such as event type, relay
response time, circuit breaker operation time, currents, voltages, and breaker power dissipation
appear directly in the breaker monitor report or can be calculated from the data stored. All event
reports are time-tagged by a self-contained clock/calendar.
Additional Features
Additional features make the SEL-352 Relay reliable and economical. The communication
functions provide remote and local examination of a wide range of data, including the voltages
and currents presented to the instrument, relay settings, history of events, breaker alarms,
sequential events, and self-test status data. You can enter and modify relay settings remotely; you
can also control all outputs via the communications channel.

Date Code 20010731 Introduction and Specifications 1-5
SEL-352-1, -2 Instruction Manual
A three-level password scheme protects settings and circuit breaker control. The SEL-352 Relay
monitors password execution and closes the ALARM contact output to indicate possible
unauthorized access. The relay requires no special communications software. Access the relay
with a dumb terminal, printing terminal, or computer with serial port and terminal emulation
software.
MODEL OPTIONS
SEL-352-1 Relay
The SEL-352-1 Relay has provided sophisticated and reliable service for many years. It
continues to satisfy the needs of most of our customers. However, we recommend using the
SEL-352-2 Relay for new designs because of the additional features it provides.
SEL-352-2 Relay
The SEL-352-2 Relay provides the following additional features:
 Overcurrent elements for detecting RMS overcurrent conditions on a per-pole or three-
phase basis (50R, 50RA, 50RB, and 50RC).
 Percent Wear function for estimating the amount of breaker contact wear per pole.
 BREAKER W command for preloading the number of operations, total current, total
energy, and percent wear fields in the operation summary on a per-pole basis.
 Optional Distributed Network Protocol (DNP) 3.00 Level 2 Slave communications
protocol.
Conventional Terminal Blocks
This model includes hardware that supports three current inputs, six voltage inputs, six
optoisolated inputs, seven programmable output contacts, one alarm contact, three EIA-232 ports,
one EIA-485 port, and IRIG-B time code. It uses terminal blocks that support #6 ring terminals.
This robust package meets or exceeds numerous industry standard type tests.
This relay is available in a 3.50" (2U), 5.25" (3U), or 7.00" (4U) rack-mount package or 4.9",
6.65", or 8.40" panel-mount package. Additional optoisolated inputs and programmable output
contacts are available with the larger packages.
Plug-In Connectors (Connectorized®)
This model includes hardware that supports all of the features of the conventional terminal blocks
model. It differs in that it uses plug-in connectors instead of terminal blocks. In addition, it
provides
 Quick connect/release hardware for rear-panel terminals.
 Level-sensitive optoisolated inputs.
This robust package meets or exceeds numerous industry standard type tests. It is available in a
5.25" (3U) rack-mount package or a 4.9" panel-mount package.

1-6 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Interface Boards
For more information about available interface boards, see Section 2: Installation.
SIGNAL PROCESSING SPECIFICATIONS
Analog
Data Acquisition:
–3dB cutoff at 1200 Hz, 64 samples per cycle, see Figure 1.3.
Harmonic
Correction
Factor
(60 Hz)
Correction
Factor
(50 Hz)
Harmonic
Correction
Factor
(60 Hz)
Correction
Factor
(50 Hz)
Fundamental 1 1 20th 1.42 1.21
through 8th 21st 1.50 1.25
9th 1.01 1 22nd 1.59 1.30
10th 1.02 1.01 23rd 1.68 1.36
11th 1.03 1.01 24th 1.78 1.42
12th 1.05 1.02 25th 1.89 1.48
13th 1.07 1.03 26th 2.01 1.56
14th 1.10 1.04 27th 2.14 1.63
15th 1.14 1.06 28th 2.27 1.72
16th 1.18 1.08 29th 2.40 1.80
17th 1.23 1.11 30th 2.55 1.89
18th 1.28 1.14 31st 2.70 1.99
19th 1.35 1.17 32nd 2.86 2.09
Relay Measurement •Correction Factor = Input Signal Level
Figure 1.3: Analog Filter Curve

Date Code 20010731 Introduction and Specifications 1-7
SEL-352-1, -2 Instruction Manual
Digital Filtering: Half-cosine filter for the 50FT overcurrent element.
Cosine filter for all other elements.
Processing Intervals: 1/8-cycle: Event Report Triggers
Targets
Optoisolated Inputs
Local Bits
Remote Bits
SELOGIC Control Equation SET A Elements
Fault Current Protection Elements
86BF Trip and Reset Elements
Contact Output Elements
SELOGIC Control Equation Analog Compares
1/4-cycle: All other elements
GENERAL SPECIFICATIONS
Tightening Torque: Terminal Block:
Minimum: 7-in-lb (0.8 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)
Terminal Connections: Terminals or stranded copper wire. Ring terminals are recommended. Minimum temperature
rating of 105°C.
AC Current Inputs: 5 A nominal: 15 A continuous, 500 A for 1 s, linear to 100 A symmetrical.
1250 A for 1 cycle.
Burden: 0.27 VA at 5 A, 2.51 VA at 15 A.
1 A nominal: 3 A continuous, 100 A for 1 s, linear to 20 A symmetrical,
250 A for 1 cycle.
Burden: 0.13 VA at 1 A, 1.31 VA at 3 A.
AC Voltage Inputs: 120 VL-N, three-phase, four-wire connection.
150 VL-N continuous (connect any voltage up to 150 Vac).
365 Vac for 10 s.
Burden: 0.13 VA @ 67 V; 0.45 VA @ 120 V.
Power Supply: Rated: 125/250 Vdc or Vac
Range: 85–350 Vdc or 85–264 Vac
Burden: <25 W
Interruption: 30 ms at 125 Vdc
Ripple: 100%
Rated: 24/48 Vdc
Range: 20–60 Vdc polarity dependent
Burden: <25 W
Interruption: 30 ms at 48 Vdc
Ripple: 5%
Note: Interruption and Ripple per IEC 60255-11 [IEC 255-11]: 1979.

1-8 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Output Contacts: Standard:
Make: 30 A; Carry: 6 A continuous carry at 70°C, 4 A continuous carry at 85°C;
1 second rating: 50 A; MOV protected: 270 Vac, 360 Vdc, 40 J;
Pickup time: Less than 5 ms; Dropout time: Less than 5 ms, typical.
Breaking Capacity (10000 operations):
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
250 V 0.20 A L/R = 40 ms
Cyclic Capacity (2.5 cycles/second):
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
250 V 0.20 A L/R = 40 ms
High Current Interrupting Option:
Make: 30 A; Carry: 6 A continuous carry at 70°C, 4 A continuous carry at 85°C;
1 second rating: 50 A; MOV protected: 330 Vdc, 40 J;
Pickup time: Less than 5 ms; Dropout time: Less than 8 ms, typical.
Breaking Capacity (10000 operations):
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for thermal
dissipation):
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
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.
Fast High Current Interrupting Option:
Make: 30 A; Carry: 6 A continuous carry at 70°C, 4 A continuous carry at 85°C;
1 second rating: 50 A; MOV protected: 330 Vdc, 40 J;
Pickup time: Less than 200 µs; Dropout time: Less than 8 ms, typical.
Breaking Capacity (10000 operations):
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Cyclic Capacity (4 cycles in 1 second, followed by 2 minutes idle for thermal
dissipation):
24 V 10 A L/R = 40 ms
48 V 10 A L/R = 40 ms
125 V 10 A L/R = 40 ms
250 V 10 A L/R = 20 ms
Note: Fast High Current Interrupting Option output contacts are not polarity dependent.
Note: Make per IEEE C37.90: 1989; Breaking and Cyclic Capacity per IEC 60255-23
[IEC 255-23]: 1994.
Optoisolated Inputs: 250 Vdc: Pickup 200 –300 Vdc; Dropout 150 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 Vdc optoisolated inputs draw approximately 4 mA of current, 110 Vdc inputs
draw approximately 8 mA of current, and 250 Vdc inputs draw approximately 5 mA of
current. All current ratings are at nominal input voltage.