Making Electric Power Safer, More Reliable, and More Economical

Improve feeder protection quality and performance through integrated protection, monitoring, and control.

SEL-351S Protection System

Complete Overcurrent ProtectionProtect lines and equipment using phase, negative-sequence, residual-ground, and neutral-ground overcurrent elements with directional control.

Increased Overcurrent Element Security With Second-Harmonic Blocking

Use the second-harmonic blocking elements to detect transformer energization, and block selected tripping elements until inrush conditions subside.

Enhanced Breaker MonitoringInspect reports for the most recent trip and close operating times and average operating times, or gather trending data for up to 128 previous operations. This information allows timely and economical scheduling of breaker maintenance.

Fast Dropout Breaker Failure ElementDetect a failed circuit breaker with built-in breaker failure detection elements and logic.

Features and Benefits

40C +85C

2

Functional Overview

Feature Overview

Optional front-panel USB port simplifies local connections and speeds relay communications.

Field-configurable, programmable operator

pushbuttons.

Default displays or programmable custom messages.

User-configurable label option.

Programmable front-panel LEDs for custom alarms.

Optional independent SafeLock trip/close

pushbuttons with high-visibility indication.

Advanced SELogic control equations.

High-current interrupting output contacts.

Standard multisession Modbus TCP and DNP3.

Optional IEC 61850.

MirrorED BitS communications.

Optional expanded I/O.

Built-in phasor measurement unit.

Independent terminals for SafeLock trip/close

pushbuttons.

Standard single copper Ethernet. Optional dual

copper or fiber-optic Ethernet with fiber-optic serial port. Optional one copper, one fiber-optic

Ethernet with fiber-optic serial port.

Optional sensitive earth fault (SEF) protection.

Optional EIA-485 port.

3Use the SEL-351S synchronism check and voltage condition logic to program up to four shots of automatic reclosing with automatic or manual supervision.Sequence coordination logic is built in to synchronize relay protection to downstream recloser operations.

Instantaneous and Time-Overcurrent Elements Use multiple instantaneous and time-overcurrent elements

with SELogic control equations to coordinate protection with downstream devices. Best Choice Ground Directional Element logic optimizes directional element performance and eliminates the need for many directional settings.

Select from six phase, six negative-sequence, and six ground instantaneous overcurrent elements to best fit your application.

Access power system disturbance information through the voltage sag, swell, and interruption (VSSI) recorder for advanced power quality monitoring.

Overcurrent Features

Advanced Reclosing Capabilities and Sequence Coordination

Voltage Sag, Swell, and Interruption

351-5-6-7_IM_0096_VbaseTracking_a.eps

0

5

10

15

20

25

30

35

0 40 80 120 200 240 280

Time (s)

kV (P

rimar

y)

Swell Pickup(110%)

Sag Pickup(90%)

InterruptionPickup (10%)

|V1||VA|, |VB|, |VC|

Vbase

Sag Overload

Interruption (Breaker Open)

160

Vbase ResumesTracking

Vbase StopsTracking

Fast Curve(Line Recloser)

51P Pickup

Slow Curve(Line Recloser)

t

IF I

51P1T(SEL-351S)

51P2T(SEL-351S)

SEL-351S

R

Line Recloser

IF

Fast Curve(Line Recloser)

51P Pickup

Slow Curve(Line Recloser)

t

IF I

51P1T(SEL-351S)

51P2T(SEL-351S)

SEL-351S

R

Line Recloser

IF

Interruption, sag, and swell pickup levels.

Sequence coordination between the SEL-351S and a line recloser.

Digitally Signed Firmware Upgrades The cryptographically secure signature ensures that the file has been

provided by SEL and that its contents have not been altered. If the SEL-351S cannot verify the signature, it rejects the corrupted or

altered firmware file.

Design Template Storage Store any number of files inside one compressed file up to 750 kilobytes,

including acSELErator QuickSet SEL-5030 Software settings files, an acSELErator QuickSet relay database containing a design template, or other files of your choice.

QuickSet automatically verifies that settings match the design template upon retrieving the template from the relay.

Ease of Use and Security Benefits

acSELErator QuickSet Design template.

4The SEL-351S includes communications-assisted tripping schemes that provide unit protection for transmission or networked distribution lines. No external coordination devices are required. Built-in scheme logic permits fast trip times, reducing fault duration that adversely impacts system loads, power system equipment, and stability. Apply MirrorEd BitS to communications-assisted tripping over traditional communications equipment. MirrorEd BitS implementation has the advantages of increased reliability using less equipment, increased speed with no contact closure delay, better security through built-in channel monitoring, and reduced wiring complexity.

Communications-Assisted Tripping

Level 3 (1)Level 1 (1)

Level 2 (1)

Level 1 (2)Level 3 (2)

Level 2 (2)

SEL-351SSEL-351S

Bus 1

Bus 2

Comm.Equip

Comm.Equip

TX TXRX RX

Transmission Line521

522

Communications-assisted tripping.

MirrorEd BitS communications technology provides bidirectional digital communications between devices. Use MirrorEd BitS communications to transmit/receive information between upstream relays and downstream recloser controls to enhance coordination and achieve faster tripping for downstream faults.

Underfrequency ProtectionApply six steps of underfrequency elements for multilevel under- and overfrequency trip and control, and to provide comprehensive load control.

Rate-of-Change-of-Frequency (ROCOF) ProtectionImprove frequency control with four independent ROCOF elements. Each element includes logic to detect either increasing or decreasing frequency, allowing control or switching action, such as network decoupling or load shedding.

Flexible Underfrequency Elements

Enhanced MiRRoRED BiTS Communications

+

+

+

TREND = INCREASING

TREND = DECREASING

ROCOF

TREND = ABSOLUTE

MEASUREDRATE-OF-CHANGE OF FREQUENCY

PICKUP SETTING

ROCOF logic diagram.

Improve performance with SEL MirrorED BitS communications.

Patented MirrorEd BitS communications is simple, powerful, field-proven technology.

5Communications Media 10/100BASE-T Ethernet 100BASE-FX Ethernet EIA-232 Serial EIA-485 Serial USB Type B BNC Fiber-Optic MM ST Serial Port

Communications Protocols MirrorEd BitS Communications IEEE C37.118 Synchrophasors IEC 61850 GOOSE IEC 61850 MMS Modbus TCP Modbus RTU Telnet DNP3 Serial DNP3 IP Web Server SNTP FTP SEL Fast Messages ASCII IRIG-B

Connect the SEL-351S directly to a local network with the built-in Ethernet interface or through an SEL-3530 Real-Time Automation Controller (RTAC).

Use DNP3 LAN/WAN, Modbus TCP, and IEC 61850 to quickly send information through your networks.

Increase communications reliability with separate and redundant communications ports.

Transfer data at high speeds (10 Mbps or 100 Mbps) for fast HMI updates and file uploads.

Use popular Telnet applications for easy terminal communication with SEL relays and other devices.

Use popular FTP applications for easy transfer of settings, events, and history files.

Transmit synchrophasor data to multiple clients using UDP and TCP formats.

Simplify wiring and installation by receiving a time signal over existing Ethernet networks using Simple Network Time Protocol (SNTP). SNTP makes a good backup to more accurate IRIG-B time synchronization.

Integrate With Ethernet Networks

Flexible Communications

SEL-351S

SEL-351S

SEL-351S SEL-487B

Wide-AreaNetwork

SEL-3354

SEL-2730M

SEL-3530

SEL offers complete Ethernet direct-connect solutions.

The SEL-351S Relay offers many communications options.

Front Panel. Rear Panel.

6Access basic SEL-351S information on a standard Ethernet network with the built-in web server. View relay status, Sequential Events Recorder (SER) data, metering information, and settings through easy access within a local network. Web server access requires a relay password and is limited to read-only viewing of information.

Web Server

Specify optional SafeLock trip/close pushbuttons and indicating lamps for your next SEL-351S application. The independently operated switches and breaker status lamps are functional even if the relay is out of service. Switch contacts and indicating lamps are separately wired to screw-terminal blocks on the rear of the relay. Choose the wiring arrangement that best suits your need for breaker control and status indication. The trip/close pushbuttons are equipped with the SafeLock system to prevent inadvertent operation and facilitate tagout procedures.

52a

52b52TC

43

local Remote Trip/Protection Trips

TRIP(manual/local)

BREAKERCLOSED

+

BREAKEROPEN

CLOSE(manual/local)

43

local

+

Remote Close/Autoreclose

To CloseCircuit

Optional trip/close pushbuttons operate independently from the relay function.

Eliminate Panel-Mounted Breaker Control Switches

SELogic control equations permit custom programming for traditional and unique protection and control functions. Add these programmable control functions to your protection and automation systems.

Expanded SELogic Control Equations

Create your own custom applications using powerful SELogic control equations.

Operator Type Operators

Boolean +, *, !

Edge Detection /, \

Precedence Control ()

Web server menu screen.

7Improve system performance with synchrophasor technology. SEL offers complete synchrophasor solutions, including hardware, communications, data collection, viewing and analysis software, and data archiving.

Improve system performance using real-time system state measurement with time-synchronized voltages and currents available in the SEL-351S.

Help system operators prevent cascading blackouts and monitor system stability with a new synchrophasor view of the power system.

Use SEL-5078-2 SynchroWaVE Central Software or third-party software to view and analyze system phase angles, load oscillations, voltage profiles, and other critical system information. Stream synchrophasor data with the IEEE C37.118 standard format.

Use acSELErator QuickSet SEL-5030 Software to set, monitor, and control the SEL-351S.

Save engineering time while maintaining flexibility. Communicate with the SEL-351S through terminal software, or use the acSELErator QuickSet graphical user interface.

Develop settings offline with a menu-driven interface and completely documented help screens. Speed installation by copying existing settings files and modifying application-specific items.

Simplify the setting procedure with rules-based architecture to automatically check interrelated settings. Out-of-range or conflicting settings are highlighted for correction.

Streamline configuration of IEC 61850 enabled relays with acSELErator Architect SEL-5032 Software.

Easy-to-Use PC Software

Add Synchrophasors to Your System

acSELErator QuickSet settings form view.

acSELErator event report.

Real-time SynchroWaVE Central data.

AC Current Inputs1 A or 5 A Inom (specify on order); 3 x Inom continuous; 100 x Inom one-second thermal rating; linear to 20 x Inom symmetrical

Burden 0.27 VA @ Inom for Inom = 5 A; 0.13 VA @ Inom for Inom = 1 A

AC Voltage Inputs300 VL-N continuous (connect any voltage up to 300 Vac) 600 Vac for 10 seconds

Burden 0.03 VA @ 67 V; 0.06 VA @ 120 V; 0.8 VA @ 300 V

Output Contact Ratings (standard model)30 A make per IEEE C37.90-1989; 6 A continuous carry @ +70C; MOV protected

Optional high-current interrupting (10 A @ L/R = 40 ms) contacts available

Serial Communications PortsOne front-panel and two rear EIA-232 serial ports, one optional rear-panel EIA-485 serial port, one optional fiber-optic serial port, and one optional front-panel USB port

SEL ASCII commands, SEL MirrorEd BitS communications, SEL Fast Messages, DNP3, Modbus RTU, and IEEE C37.118 synchrophasors

EIA-232 serial data speed: 30057600 bps

Processing SpecificationsAC voltage and current inputs: 128 samples per cycle, 3 dB low-pass analog filter cut-off frequency of 3000 Hz

Digital filtering: Full-cycle cosine filters after low-pass analog and digital filtering

Protection and control processing: 4 times per power system cycle

SynchrophasorsIEEE C37.118 StandardUp to 50 messages per second (50 Hz system) Up to 60 messages per second (60 Hz system)

Power Supply24/48 V 1860 Vdc 48/125 V 38140 Vdc or 85140 Vac 125/250 V 85350 Vdc or 85264 Vac

Ethernet Communications OptionsProvides IEC 61850, DNP3 LAN/WAN, FTP, Modbus TCP, SNTP, IEEE C37.118 synchrophasor, and Telnet protocols

Ethernet Connection Media Options: 10/100BASE-T twisted-pair network 100BASE-FX fiber-optic network

Frequency and Phase Rotation60/50 Hz system frequency and ABC/ACB phase rotation are user-settable

Operating Temperature40 to +85C (40 to +185F) Note: LCD contrast impaired for temperatures below 20C

Weight (maximum)15 lbs (6.8 kg)3U rack-unit-height relay

General Specifications

Pullman, Washington USATel: +1.509.332.1890 Fax: +1.509.332.7990 www.selinc.com info@selinc.com

20092013 by Schweitzer Engineering Laboratories, Inc. PF00200 20130326

SEL-351S Protection System