Wireless Data Communication in Substations Mladen Kezunovic (P.I.) Costas N. Georghiades Alireza Shapoury PS ERC PSerc Review Meeting Texas A&M University College Station College Station, March 22, 2002

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station2 OUTLINE  Part I Summary Report  Part IITechnical Report  Conclusions

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station3 OUTLINE OF PART I  Introduction  Project Background and Brief History  Recent Activities  Statement of Work  Activity Schedule  Project Status

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station4 Introduction Defining the Most Appropriate Wireless Strategy for Substation Environment A Continuation of the Previous Reports Presented Earlier to the PSERC Industry Advisors Covering Activities in the period December March 2002

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station5 ISM (Industrial,Scientific and Medical) band Wide Usage License-free Higher RF Power If Spread Spectrum Substation Monitoring Applications Cost-effective Communication Point of Concern:Specific Environment of Substation Project Background and Brief History

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station6 Theoretical analysis and technical observations Core Spread Spectrum Techniques FHSS DSSS Field measurement FreeWave Modems Diagnostic Software (Setup Plan) Identifying system characteristics Recent Activities

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station7 TASK 1. Feasibility study and planning TASK 2. Theoretical analysis and technical observations TASK 3. Field measurement TASK 4. Identifying characteristics of a reliable system TASK 5. Special concerns TASK 6. Finalizing the results, Documentation Statement Of Work

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station8 Activity Schedule

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station9 Identification of the Necessary Devices for Measurement (Accomplished) Measurement Setup Plan (Accomplished) Theoretical Development (In Progress) Field Measurement (In Progress) The Project Follows the Specified Task Schedule Project Status

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station10 OUTLINE OF PART II  Introduction  Theoretical Analysis and Technical Observations  Field Measurement  Identifying Characteristics of a Reliable System  Conclusion

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station11 Use real-time and off-line data for better circuit breaker maintenance management Utilize new technologies of wireless communications and mobile agents As an example, improve efficiency of circuit breaker maintenance assessment Demonstrate the benefits of new communication and software technologies using utility maintenance management scenarios Introduction

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station12 Impulsive noises and EMI Impact On Wireless Channel Noise Sources In Substations Review of The Noise Impact On Spread Spectrum Schemes Crude Comparison Of DSSS And FHSS Worst-case Analysis Worst-case happens under different noise profiles for DSSS and FHSS Theoretical Analysis and Technical Observations

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station13 DSSS indicates approximately 5dB superior to that of FHSS under worst-case noise profile of their own Assessment of the likelihood of the Worst-case situations necessitates measurement

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station14  Devices, Configuration and Operation Modes  Measuring Statistics Average Noise Power Average Signal Power Average Packet Error Temperature  Investigating Practical Issues (E.g. Antenna Type and Location, Proper Output Power) Field Measurement

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station15 Measurement Setup

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station16 Revised Measurement Setup

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station17  Achievable Baud Rate For Wireless Channel  Maximum BER For Data Devices  Necessary Response Time For The Wireless Device  Antenna  Power Supply And Isolation  Adequate Data Security Identifying Characteristics of a Reliable System

PS ERC PSerc Review MeetingMarch 22, 2002Texas A&M University at College Station18  Identification of noise sources in substation  Worst-case analysis for two core SS modulation formats  Extraction of the necessary parameters (to be measured)  Measurement setup (modifications, verifications and programming )  Measurement runs (In process)  General requirements for the wireless system candidates (Ongoing) Conclusion