scada communications for protection engineers
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7/21/2019 SCADA Communications for Protection Engineers
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SCADACommunications for
Protection Engineers
Rich Hunt, Bogdan Popescu
GE Digital Energy
Teas A!" Relay Conference #$%&
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'uestions()hat does the SCADA team do*
RT+s are oer - .hy don/t they use
relays*Communications(
0ntegral part of SCADA
Ad1unct function to protection
0ntroduction
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SCADA System
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SCADA 2unctions
Type Function DescriptionStatus "etering Real time po.er system status
"easurements3on4operational data such as temperatures, gaspressure, etc5
Deice Status Real time e6uipment status Deice Alarms Real time e6uipment status
Control Direct Trip ! Close +nsuperised control of primary e6uipment
SB7 Trip ! Close Superised control of primary e6uipment
S.itching Automatic s.itching se6uences for primary e6uipment
0nterloc8ingSecure s.itching se6uences to ensure operations ta8eplace in a speci9c order to preent e6uipment damageor operational failures
Control :ogicProgramma;le logic used to implement s.itching,interloc8ing, and other operations
Communications Communications Gate.aySingle point of remote communications access for thesu;station for SCADA and engineering needs
Protocol ConersionConerting data ;et.een arious SCADA protocolsimplemented ;y legacy deices
Data ConcentrationCom;ining real time po.er system status data forsimpler transmission
Historian < DBData storage and management for long term analysisand documentation
Security 2ire.all Proide cy;er security functionality for a su;station5
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SCADA Deices
Device Typical Use
RTURemote Terminal +nit5 Separate deice, .ith 0<7 peripherals, for collecting statusinformation and issuing control commands
GatewayCommunications interface directly to other e6uipment5 Some connection to 0<7peripherals5
HMI Human "achine 0nterface5 A separate graphical user interface that may include someRT+ and Gate.ay roles
Automation Controller / !C Separate deice to implement control logic if not aaila;le in RT+, Gate.ay, or H"0
I/" erip#erals0<7 deices such as measurement transducers and contact 0<7 to implement SCADAfunctions
$CUBay control unit5 0ntended to ;e a ;ay leel SCADA deice for status and control ofe6uipment ;ays
rotective relayPart of the SCADA system .hen proiding status information, and<or as a controlpoint
Meters Proides status information
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Register4;ased protocolsD3P= >0EEE %?%&@
"od;us
%$$/s of othersCommunications modeling
0EC %?&$
Communications "ethods
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D3P s %?&$ for ProtectionDeices
D%
Polls relays for data
Sends controls to relays
Re6uires points listmapping in deice
:ist from SCADA,con9guration ;y protection
I&C '()*+
Reports from relay
Controls to relay
Dataset <communicationscon9guration doneeternal to protection
G77SE for protection,SCADA
)ho con9gures*
)ho o.ns*
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7perations( Protection s5 SCADA
Protection 7perationsProtection trip, close
Relia;le, deterministic, lo. latency,
unsuperisedSCADA operations
3ormal operations
Trust ;ut erify operations 4 SB7Groups
Protection( o.ns relays, and direct trips
SCADA, o.ns BC+s and operations
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Select Before 7perate >SB7@
GoalsEliminate single point of failure
Secure selection of command outputs
Resere outputs for se6uence)hy*
S.itching se6uences
Security ;et.een multiple control points
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SB7 State "achine
rotection comman,s can-tuse S$"
Direct trip is not S$"
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SB7 selectionat any leel
:oc8s out
operationfrom all otherleels
Allo.s
remote, localoperations.<o ris8
)ho issues SB7*
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0mplementing SB7
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SB7 Architectures
rotection ownstrippin.
rotection SCADA#ave own trips
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SB7 Architectures
rotection SCADA own t#eir ,evices
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SB7 Architectures - 0EC %?&$
rotection owns trip contact&ac# .roup owns control
mo,el
&ac# .roup owns trip contactcontrol mo,el
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Process Bus
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SB7 and Process Bus
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Recommendations
I,eal Goo, &nou.#
rotectionSCADA #ave
own trips
rotection SCADA own t#eir,evices
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SCADA and protection groups haedierent goals, needs
Good system design accommodates
;othE6uipment control is the interfacepoint
Direct trip s5 SB7
7.nership of e6uipment, roles must;e negotiated
%?&$ complicates this discussion
2inal Thoughts
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Than8 ou
'uestions*
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