Oncor Electric Delivery

Intelligent Grid atOncor Electric Delivery

SWEDE Conference

Alan Bern – SCADA / Automation Manager

May 1, 2008

2

Smart Grid Is Not Just …

Advanced Meter Reading (AMR) or Advanced Meter Infrastructure (AMi)

Distribution Automation

Substation Automation

Advanced Distribution Applications

Fault Identification and Location

Volt – VAR Control

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Smart Grid Is …

Distribution AutomationIntelligent SwitchingCapacitor Control

Advanced MeteringRemote Sensing

ApplicationsDMS/OMS/SCADAMWM/EMS/MDMS

CommunicationsSatellite, RF, Fiber, Cellular, BPLPLC, Pager, Microwave

FiberSubstationMonitoringSCADAControl

System MonitoringVoltage / CurrentOutageFault Indication

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Wireless Information Backhaul

Station

RouterRouter

Station

Station

Broadband Insertion

Point

Broadband Insertion

Point

Extender

GatewayGateway

Collector

Extender

Collector

Extender

Collector

Extender

Collector

Switching Station

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CURRENT Smart Grid ServicesNetwork Architecture

Low Voltage <10 Mbps

Medium Voltage < 20 Mbps

Fiber or Wireless Backhaul1 Gbps (fiber), 1-3 Mbps (wireless)

MANDWDM Multi Gbps

Carrier POP

Utility Substation(Operational & Non-

operational Data)

Metro Area Fiber Network

Managed In Home Network

Private IntranetUtility Partner

Real time control & verification

All meter data

Distribution Point

Current and voltage sensing at the transformer

CT Coupler & CT Bridge®

Current NodeCT Coupler &

CT Backhaul-Point

CT Coupler® & CT OTP™

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BPL Transformer Monitoring

E-Mail Notification

Report

Details

What happened

here?

1 2

3

Secondary Neutral Failure

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TRANSFORMER MONITORING SUMMARY

Voltage Monitoring Field Investigation Cause Summary

BO Xformer25%

Capacitor2%

BO XformerLead/Connection

10%

Secondary Brkr Tripped30%

BO Arrestor1%

BO Secondary2%OL Secondary/Xformer

9%

Trees8%

Xformer Tap1%

BO Secondary NeutralConnection

6%Sub LV Bus Voltage

6%

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AMS Systems

CURRENTNOC

Direct Load Control

ServiceTo Home

Electric Meter, (Svc Disconnect)

Commercial Meter

DistributionSubstation

PowerLines

PLC - Substation Communication

Equipment

BPL Fiber

BPL Backhaul Point BPL Bridge @ Trans

Oncor PLC Server

OncorMDMS

PLC – Two Way Automatic Communication System (TWACS) by DCSI

BPL – CURRENTBilling

BPL Data Flow

PLC Data Flow

Note: Illustrative, both technologies will not normally be installed on the same substation

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Transmission Grid Management

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Substation Automation

Before

After

•Relay Replacement Program

•Integrated Digital Fault Recorder

•Equipment Monitoring

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Distribution Automation – Smart Switches

Manual OperationSCADA OperationUnder frequency EventOver Voltage EventUnder Voltage EventReclose SchemeCurrent Analog Values

Substation RTU

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Distribution Capacitor Automation

• VAR Management

Master controlled system – monitors feeder VAR flow at substation

Allows tighter control over feeder power factor (reduces losses)

Allows better utility response to customer installed capacitors

Primarily uses 1-way paging (some 2-way

w/cell modems)

3,410 automated controls installed

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Power Factor Comparison

2005/2006 Power Factor Comparison for Balch Springs 1905

82.00%

84.00%

86.00%

88.00%

90.00%

92.00%

94.00%

96.00%

98.00%

100.00%

102.00%

Time (8/21 - 8/23)

Po

wer

Fac

tor

2005 Power Factor 2006 Power Factor

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DMS Functionality

OverloadsFault LocationRemote Control SwitchesAutomated fault isolationVolt / VAR ControlLoad Flow Modeling

Note: With field values

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Create AMR Ping List Command Drop Down

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All of this and MORE is Smart Grid at Oncor …