2 4-3 distribution hunt coursey & hirsch simplifying protection system design for distribution...

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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2Simplifying Distribution Protection

65thAnnual Texas A&M April 2-5, 2012

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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3Simplifying Distribution Protection

65thAnnual Texas A&M April 2-5, 2012

Existing protection system


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Simplifying Distribution Protection65thAnnual Texas A&M April 2-5, 2012

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!

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