2020

Schweitzer Engineering Laboratories, Inc. SEL-2020 Data Sheet

SEL-2020 Communications Processor

Major Features and BenefitsThe SEL-2020 Communications Processor is a breakthrough for substation communication and integration. Itcombines multiport communications, databases and processing, nonvolatile memory, timekeeping and syn-chronization, alarm monitoring, and auxiliary control into one compact, powerful, economical, easy-to-use,and rugged device.

➤ Automatically maintains databases for metering, events, and targets.

➤ Powerful 32-bit computer simultaneously supports 38400 baud on all master ports and 19200 baud onall other ports.

➤ SELOGIC® control equations coordinate commands, messages, and I/O.

➤ Auto-configuration features simplify application settings with SEL relays.

➤ Versatile data-processing power handles most relays, meters, and SCADA systems.

➤ One device integrates most small substations.

➤ Easily cascaded for economical large-station solutions.

➤ Communications processing reduces burden on SCADA and other equipment.

➤ Handles binary and ASCII communications for versatile application.

➤ Can be a Modbus® RTU or Distributed Network Protocol (DNP3) Level 2 slave to ease data collectionand system control.

SEL-2020 Data Sheet Schweitzer Engineering Laboratories, Inc.

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Functional Overview

Figure 1 Functional Diagram

Figure 1 shows a functional model of the SEL-2020including the Input Handlers, Message Generators, DataArea, SELOGIC Control Equations Processor, TimeProcessor, optional I/O, optional nonvolatile archivememory and optional Internal Modem.

Input Handler/Message Generator

There is an Input Handler and Message Generator foreach serial port. When you communicate with theSEL-2020 using the command set, the Input Handlerseparates the commands into their basic components.The Input Handler sends data to the Data Area anddirects the Message Generator to make a response basedon the SEL-2020 settings that you have defined.

When you use the SEL-2020 as a port switch, the InputHandler places collected data in the Data Area, and theMessage Generator reads and outputs these data to a

designated port. The Input Handler also stopscommunication when it recognizes the defaulttermination condition or a termination condition youhave defined in settings.

Messages are predefined responses that may includedata, responses to special-purpose user-definedcommands, and automatic messages that you havedefined in settings and that are triggered by SELOGIC

control equations. You can use relay automatic messagesto initiate data collection by setting the SEL-2020 tocollect and store data when an unsolicited message isreceived. For example, receiving a summary event reportcould trigger the SEL-2020 to send the EVENTcommand back to the relay. The relay would respondwith the long event report, and the SEL-2020 could thensave it. You can store the data in volatile RAM or in theoptional nonvolatile archive memory.

SEL-2020Communications Processor

OptionalArchiveMemory

DataArea

TimeProcessor

SELOGIC

ControlEquationProcessor

InputHandlers

MessageGenerators

OptionalInternalModem

External Modem

OptionalI/O

Phone Line

Phone Line

17 EIA-232 Ports

4 Output Contacts

16 Optoisolated Inputs

IRIG-S Input*

16 IRIG-B Outputs*

*IRIG-B input NOT requiredto have IRIG-B output


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Data Area With Automatic Database

The Data Area is divided into regions of volatile (RAM)and nonvolatile memory. The SEL-2020 stores settings innonvolatile memory. The SEL-2020 is unique in itsability to receive, parse, store, and distribute data. TheSEL-2020 automatically parses data from SEL relays,and has several parsing options for data from otherdevices. Additional nonvolatile archive memory is anoption you can use for long-term data storage.

SELOGIC Control Equations Processor

The SELOGIC Control Equations Processor executesBoolean equations that you write to trigger transmissionof messages. The Boolean values in the equations can belogic bits from the Data Area or comparisons against thepresent time. You can program the SEL-2020 torecognize user-defined commands and to set a bit in theData Area when it receives one of these commands. TheSELOGIC Control Equations Processor can then use thisbit to initiate another operation, such as collecting data ortransmitting a message. The SELOGIC Control EquationsProcessor also controls the optional I/O.

Arithmetic building blocks include addition, subtraction,multiplication, and division.

Time Processor

The Time Processor keeps the date and time, reads IRIG-B time input (if it is present), and broadcastsdemodulated IRIG-B time code to all rear-panel serialports. It also time-tags data stored in the Data Area andsupplies time and day of the week input to the SELOGIC

Control Equations Processor.

Optional I/O

If the optional I/O is installed, the inputs and outputsoperate with the Data Area and the SELOGIC ControlEquations Processor. Optoisolated inputs feed directlyinto the Data Area as logic bits, which you can viewusing SEL-2020 commands. You can program SELOGIC

control equations to use the bits. The SELOGIC ControlEquations Processor controls the output contacts on theI/O board. These output contacts can be programmed tooperate based on Data Area bits or time comparisons.This powerful capability lets you build adaptive relayschemes, automate responses to alarms, and directlycontrol power apparatus.


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Product OverviewSEL-2020 DescriptionThe SEL-2020 Communications Processor (SEL-2020)provides many special features needed in today'ssubstations for communicating with a variety ofmicroprocessor-based devices, including digital faultrecorders, sequential events recorders (SER), digitalmeters, and digital relays. The SEL-2020 can function asa simple, but intelligent, port switch. Or it can providesophisticated communication and data handlingcapability required for advanced substation integrationprojects. Data are collected, processed, and stored in theSEL-2020 database, permitting quick distribution ofselected data to an RTU (remote terminal unit) or otherdevice. Figure 2 shows an example block diagramconfiguration of the SEL-2020 with various SEL relaysand peripheral devices connected.

Enhanced/Intelligent Port SwitchingUnlike conventional port switches, the SEL-2020 cansupport communications on all active ports—simulta-neously—at baud rates up to 19200 or 38400 dependingon port configuration. This means that you can commu-nicate locally through the SEL-2020 with one connectedintelligent electronic device (IED) at the same time thatsomeone else is communicating remotely through thesame SEL-2020 to another connected IED. Other intelli-gent features, like the SEL-2020 auto-configurationfunction, make setup and operation much easier thanwith simple port switches. In advanced applications,where the SEL-2020 is used to collect, store, and distrib-ute information, the simultaneous communication func-tion provides an uninterrupted flow of information fromall active IEDs to an RTU or station integration com-puter; at the same time you can communicate through theSEL-2020, either locally or remotely, with one of theconnected relays or IEDs.

Data Collection, Processing, Storage, DistributionYou can collect, store, process, and distribute target,meter, event, status, and other information—virtually allinformation available from an SEL relay and a variety ofinformation available from other IEDs—with theSEL-2020, using a simple, but powerful, set of commu-nication commands. Likewise, the SEL-2020 reduces theprocessing burden for these external devices by separat-ing selected data from IEDs so that only the essentialinformation is delivered and in the form and formatrequired.

Substation Integration and Network InterfaceCommunication and information handling features makethe SEL-2020 ideal for substation integration projects,eliminating the need for separate substation networkarchitecture. On larger integration projects, theSEL-2020 reduces or eliminates the need for costly net-work interface devices, otherwise required for each IED.Inclusion of Modbus and DNP support eases integrationwith systems that support Modbus or DNP.

Time SynchronizationThe SEL-2020 can synchronize the time clocks inattached devices, such as SEL relays, that accept ademodulated IRIG-B time signal. The demodulatedIRIG-B signal is regenerated in the SEL-2020 from anexternal modulated or demodulated source, such as aGOES or GPS satellite clock receiver. If no IRIG-Bsource is available, the demodulated IRIG-B time signalis generated internally by the SEL-2020.

Optional Expanded Long-Term Information StorageLong-term information storage, for such functions asalarms, event reports, and load profiles, can be accom-modated using optional nonvolatile archive memory.

Optional Input/OutputOptional I/O, consisting of four programmable outputcontacts and 16 optoisolated inputs, is available for mon-itoring and control. You can use SELOGIC control equa-tions, written in the SEL-2020 settings, to perform basiccontrol functions such as consolidating alarms andswitching adaptive relay setting groups. Jumper config-ure each output contact as form A or form B through sol-dered jumper connections. Jumper configure each inputwith board-level jumper connections, to accept one ofthree control input voltage ranges, 30–60 Vdc, 80–150Vdc, or 150–300 Vdc.

Optional Internal ModemAn optional internal modem is also available for theSEL-2020 to reduce external wiring and connections.Whether external or internal, you can use any modemconnected to the SEL-2020 to remotely communicatewith or through the SEL-2020 to attached devices. Useany telecommunications software that supports ASCIIdumb terminal emulation to communicate with andthrough the SEL-2020; no proprietary software is needed


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unless it is required by non-SEL IEDs. You can programeach SEL-2020 port that is connected to a modem to dialout through the modem to deliver messages, eventreports, and other information to computers at remotelocations.

Compact DesignThe SEL-2020 is available with two mounting styles; oneis for mounting in panels and one is for mounting inracks. You can reverse the mounting ears on the rack-mount case for projection mounting. Figure 4 shows theSEL-2020 front panels. Figure 5 shows the SEL-2020rear panels, both with and without the optional I/O board.Refer to Figure 6 for dimensions and drill plan.

Figure 2 SEL-2020 Example Configuration Diagram

Application ExamplesCollect and Format Data From Relays and Other DevicesThe operator can define strings to instruct the SEL-2020to collect and format relay data for RTUs. Simplesettings enable you to individually configure SEL-2020ports to define their data retrieval and storage attributes.You can instruct the SEL-2020 to automaticallyinterrogate connected devices for data collection. Built-in parsing and conversion capabilities help you retrievedata from many different devices. The SEL-2020 can

also provide a uniform data interface to the RTU, so thatthe RTU software does not have to specificallyaccommodate each IED type.

Access Data Through Multiple PathsDifferent departments in a utility may be interested indifferent data and different data rates. For example, asystem operator may be interested in metering andcontact data every five or ten seconds and fault locationshortly after a fault. A protection engineer is usually

RTU

Printer

IRIG-BTime

Receiver

SEL-2020Communications

Processor

Local UserInterface

SCADA

EMS

TelephoneLine

SEL-351A

SEL-351A

SEL-351A

SEL-351A

SEL-321

SEL-311C

SEL-351SEL-587

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SEL-321

SEL-311C


8

interested in setting relays, and analyzing a full eventreport after a fault occurs. You can accommodate theseneeds by connecting one port on the SEL-2020 to aSCADA RTU for the operator and a telephone modem toanother port for the protection engineer.

Program the SEL-2020 Database FunctionsUse the SEL-2020 settings and SELOGIC controlequations to build a database of load profiles and eventreports and to store them in nonvolatile memory. Definecommands so different devices can retrieve appropriatelyformatted data. Use arithmetic functions to sum current,power, or other data. Subtract sensed information from athreshold value and check the resulting sign toimplement comparisons.

Synchronize All Relay Clocks Within a SubstationThe SEL-2020 receives an IRIG-B time-code input froma single IRIG-B receiver or local clock and distributes itto the devices connected to any of the 16 serial ports. TheSEL-2020 supports modulated or demodulated time-code input.

If there is no external signal, the SEL-2020 generates anIRIG-B signal using an internal clock so you cansynchronize device clocks without an IRIG-B receiver orlocal clock.

Use Events to Switch Relay Setting GroupsProgram the SEL-2020 to use the time of day, day of theweek, or a specific event, such as a relay alarm output, toswitch relay setting groups.

Monitor Relay Alarm ContactsWith the optional I/O installed, you can program theSEL-2020 to monitor relay alarm contacts. Instruct theSEL-2020 to send predetermined messages or initiate anaction you designate, like closing an output contactbased on these inputs.

Log Messages On a Local PrinterYou can set the SEL-2020 to print selected messages,including control actions, diagnostic status messages,short event reports, and demand meter data.

Drive a Local Human-Machine Interface With Relay DataConnect a computer to the SEL-2020 through thecomputer serial port. Using your own human-machineinterface (HMI) software, you can build screens andspecify the HMI data definition. You can createcommands that instruct the SEL-2020 to send selecteddata to the standard serial port interface for the HMIpackage.


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Wiring Diagram

Figure 3 SEL-2020 Typical DC Wiring Diagram

ExternalOutput

Contacts

External RelayInputs or Auxiliary

CoilsWith Optional I/O Board

OUT1 OUT4

Annunciator

ALARM

GND PS IN1 IN16

Z05

SEL-2020(partial)

Z01 + A09 A39 A01 A07Z03

Z02 A10 A40 A02 A08Z04


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Front- and Rear-Panel Diagrams

Figure 4 SEL-2020 Front Panel Diagrams


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Figure 5 SEL-2020 Rear Panel Diagrams


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Relay Dimensions

Figure 6 SEL-2020 Dimensions for Rack- and Panel-Mount Models


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SpecificationsOutput Contacts

Make: 30 A

Carry: 6 A continuous carry at 70°C4 A continuous carry at 85°C

1 s Rating: 50 A

MOV Protection: 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 ms48 V 0.50 A L/R = 40 ms

125 V 0.30 A L/R = 40 ms250 V 0.20 A L/R = 40 ms

Cyclic Capacity (2.5 cycle/second):

24 V 0.75 A L/R = 40 ms48 V 0.50 A L/R = 40 ms

125 V 0.30 A L/R = 40 ms250 V 0.20 A L/R = 40 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 [IEC 255-23]: 1994.

Optoisolated Inputs

250 Vdc: Pickup 200–300 Vdc; Dropout 150 Vdc

125 Vdc: Pickup 105–150 Vdc; Dropout 75 Vdc

48 Vdc: Pickup 38.4–60 Vdc; Dropout 28.8 Vdc

Tightening Torque

Minimum: 7-in-lb (0.8 Nm)

Maximum: 12-in-lb (1.4 Nm)

Terminal Connections

Terminals or stranded copper wire. Ring terminals are recommended. Minimum temperature rating of 105°C.

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

Dielectric Strength

Power supply, logic inputs, and output contacts: 3000 Vdc for 10 seconds.

Operating Temperature

–40° to +85°C (–40° to +185°F)Optional internal modem: –40° to +70°C (–40° to +158°F)

Unit Weight

7 lb, 12 oz. (3.50 kg)

Dimensions

3.47" H x 19.00" W x 9.00" D (8.81 cm x 48.26 cm x 22.86 cm)

Type Tests and Standards

Surge Withstand: IEEE C37.90.1Logic inputs, output contacts, and power supply

Standard Withstand: IEEE C37.90.25.5.2 (2) Performed with 200 frequency steps per octave5.5.3 Digital Equipment Modulation Test not performed5.5.4 Test signal turned off between frequency steps to simulate keying

Damp Heat Cyclic: IEC 68-2-30Test Db; 25° to 55°C,95% humidity, 12 + 12-hour cycle

Impulse: IEC 255-5 0.5 J, 5000 VLogic inputs, output contacts, and power supply

Sinusoidal Vibration: IEC 255-21-1

Shock and Bump: IEC 255-21-2

1 MHz Burst Disturbance: IEC 255-22-1 (1988) Class 3Logic inputs, output contacts, and power supply

Electrical Discharge: IEC 801-2Logic inputs, output contacts, time-code input, power supply, EIA-232 ports, and modem port

Fast Transient Disturbance:

IEC 801-4Logic inputs, output contact, power supply, and EIA-232 ports

Serial Ports

1 front-panel/16 rear-panel ports, DB-9 connectors, MOV protected (Port 8 dedicated to EIA-232 or optional internal modem)

Real-Time Clock/Calendar

Battery Type: IEC No. BR2335 Lithium

Battery Life: 10 years

Clock Accuracy: ±20 min/yr @ 25°C(without power applied)

±1 min/yr @ 25°C (withpower applied)

±1 ms with IRIG-B time-code input

Baud Rates

300, 600, 1200, 2400, 4800, 9600, 19200, 38400

Time-Code Input

Connector: Female BNC

Time Code: Modulated IRIG-B 1000 Vdc isolationDemodulated IRIG-B TTL-compatible

Automatically sets SEL-2020 real-time clock/calendar

Time-Code Output

Pinout: Pin 4 TTL-level signalPin 6 Chassis ground reference

Connectors: All 16 rear DB-9 port connectors

Outputs are generated from IRIG-B input (when present) or generated by CPU from real-time clock/calendar


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Optional Memory

Base Memory: 512 kB RAM, 32 kB EEPROM

Expanded RAM/settings: 1 MB of RAM, 64 kB EEPROM

Expanded RAM/settings, Archive (Flash):

1 MB of RAM, 64 kB EEPROM, 2 MB Flash

Optional Modem

Internally mounted, “AT” command set compatible; up to 33,600 baud. Complies with Part 68 FCC Rules and Regulations.

300 baud CCITT V.21 and Bell 1031200 baud CCITT V.22 and Bell 212A2400 baud CCITT V.22bis9600 baud CCITT V.3214400 baud CCITT V.32bis33600 baud CCITT V.34

RJ-11C rear-panel connector.May be configured for auto dial or auto answer.


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Notes

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© 1994–2008 by Schweitzer Engineering Laboratories, Inc. All rights reserved.

All brand or product names appearing in this document are the trademark or registered trade-mark 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 fed-eral and international copyright and patent laws in its products, including without limitationsoftware, firmware, and documentation.

The information in this document is provided for informational use only and is subject tochange without notice. Schweitzer Engineering Laboratories, Inc. has approved only theEnglish language document.

This product is covered by the standard SEL 10-year warranty. For warranty details, visitwww.selinc.com or contact your customer service representative. *PDS2020-01*

SCHWEITZER ENGINEERING LABORATORIES2350 NE Hopkins Court • Pullman, WA 99163-5603 USA

Phone: +1.509.332.1890 • Fax: +1.509.332.7990

Internet: www.selinc.com • E-mail: [email protected]

SEL-2020 Data Sheet Date Code 20080530

Notes

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