Automated Capacitor Control Program at TXU Electric Delivery

SWEDE

May 1, 2006

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Automated Capacitor Control Program

Why capacitor automation?

TXU ED’s capacitor automation system requirements

System architecture

System implementation considerations

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Why Capacitor Automation ?

Capital savings on future capacitor additions

Reduced O&M costs

Manpower savings

Improved utilization of assets

Ability to adapt to changing system needs

Compensate for customer supplied capacitors

Easier to make control setting changes

Increased availability of information on capacitor bank status and operation

Information available in a timely manner

System reliability and losses

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TXU ED’s Capacitor Automation System Requirements

Centralized control

Support multiple communications modes

Control logic based on VAR flow limits using existing substation feeder/bank information (watts, VAR, voltage)

Provide centralized control for Non-LTC stations (voltage control primary - VAR secondary)

Identify specific banks requiring maintenance

Provide information on the availability of capacitors

Identify feeders with excess or deficiencies of capacitors at peak conditions

Backup local control logic

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System Architecture

PI Database

YukonWorkstation

PagingCompany 1 Paging

Company 2Central

Database

FeederBreaker

Watts & Vars

CBC7010

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System Implementation Considerations

Field trial – size and time frame

Inform all groups effected by the project to gain support and get feedback

System implementation time schedule - allow for issues identified during initial stages on project

Manpower requirements for installation of controls and setup of central system (excellent OJT opportunity for system operators)

Project implementation procedures which verify and document proper operation of all system components

Field installations

Minor repairs identified during control installation

Who will perform control installations?

Detailed installation and documentation procedures

Provide adequate training for installers and emphasize need to follow procedures

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System Implementation Considerations (cont’d)

Manpower shift with centralized control

Who will run the system?

Manpower requirements for day to day operation

Maintenance procedures for banks identified by system in need of maintenance

Contingency plans if central system goes down

Changes in inspection cycles

Reports to management

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QUESTIONS?