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8/11/2019 2 4-3 Distribution Hunt Coursey & Hirsch Simplifying Protection System Design for Distribution Substations.pdf
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Simplifying Protection System
Design for DistributionSubstations
Rich Hunt - GE Digital EnergyJohn Coursey, Stephen Hirsch - Orion NewZealand Limited
Presented at the Texas A&M 65thAnnual Conference for Protective Relay Engineers
College Station, TX April 2-5, 2012
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Outline
Overview of Orion
Distribution substation protection upgradeThe project
Project goals and constraints Tools consideredPossible tools /solutions
As implementedThe project
Performance against goals
Path for the futureResults
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Existing protection system
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Project requirements
Relay lifespan
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Initial protection system design
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Limitations to this solution
Still reliant on copper wiring, explicitphysical designLifecycle
Still a custom design for everyinstallationDesign
High energy signals still in relay roomSafety
Still significant resources required forevery projectBusiness
Limitation is that of the relays: copper wiring,
and single zone
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Technology to improve solution
IEC 61850
Complicated
Change inphilosophy
Networkcommunications
based
Multi-zoneprotection relays
Physical wiring is
complicated, timeconsuming
ercept ions are also a limit ing factor in applying
tools
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IEC 61850 technical concepts
Object-oriented modelingthrough logical nodes
Self-description ofdata
GOOSE, client-serverthrough MMS
Peer-to-peercommunications
Special form of peer-to-peer
Sampled values
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Using 61850 concepts on field wiring
The real limitation is field wiring
Copper wiring, analog data transmission Every piece of information requires 2 wires
Every wire must be designed
GOOSE, sampled values addresses field wiring
between control room and relays All data on fiber optic network
Process bus
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Addressing perceptions
61850 doesnt have to be hard
Solutions, architecture fit for purpose
Multi-zone protection relays
Process bus eliminates wiring concerns
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New tools
Process interface unit (PIU)
Sampled values per
61850 8 currents or 4currents/4 voltages
Contact I/O
Point-to-point
architecture Fit-for-purpose for
distribution sub
Multizone protection relays
Up to 6 zones of
protection Enabled for process bus
Feeder, bus, transformeroptions available
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New Rural Substation Design
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Actual installation
11 kV switchgear
PIU mounted in 11 kV
switchgear
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Actual installation cont.
PIU mounted in 33 kV breaker
Complete relay panels
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Actual installation cont.
Rear view of relay
panel
Traditionally wired
panel
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Fiber cable distribution
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New design meets goals
All components (relays, PIUs) are connectorizedcomponents
No touching field wiring in futureLifecycle Relay panel design constant
Field wiring constantDesign
Relays separate
No high energy signals at relaysSafety
Repeatable design, simple install Max utilization of resourcesBusiness
Simple, component-based approach
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Larger substations
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Economics
Panel and cable costs have escalated recently
For a sub of this size the IEC 61850 PIU solution is probably still slightly moreexpensive
Quick simple installation
Provides future flexibility -future expansion at this substation requires 3 endedline differential and conversion to 66 kV. Only need to mount an additional IEDin the panel and connect power, a fiber jumper and SCADA comms.
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Other design factors
Interoperability
Based on 1 ofcommercially availableIEC 61850 process busprofiles
Profile to use specified byOrion
Is interoperability forprocess bus trulydesirable?
Testing
Relays, PIUscommissioned as system
Orion used temporarywireless network to test
PIUs can be tested offsiteand replaced
Multiple zone relay can beconnected to spare PIU,safely isolating
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Conclusions
Pick right tools for job
Design solution around your needs, requirements What problem areyou trying to solve?
Orion design delivers specific solutions
Lifecycle costs, design and installat ion costs, safetyrequirements, business requirements
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Thank you!