gpsppt-140102124955-phpapp02.pptx

M.TECH. PROJECT PRESENTATION-2008

PROTECTION OF TRANSMISSION LINE BY USING GPSSubmitted by:G. SRINIVAS 11281A0217

OVER VIEWINTRODUCTION

TRANSMISSION SYSTEM

FAULT LOCATION

TRAVELING WAVE FAULT THEORY

ADVANTAGES

CONCLUSION

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INTRODUCTION

A new technique for the protection of transmission systems.

Relays are installed at each bus bar in a transmissionnetwork.

Relay contains a fault detection system together with a communication unit.

Relay determine the location of the fault.

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TRANSMISSION SYSTEM

GENERATION TRANSMISSION DISTRIBUTION

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LOCATION OF FAULTSave time and resources for the electric utility industry.

Determine distance to fault from a transmission line end.

Aid in fast restoration of power.

Communication systems can retrieve fault location information.

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WHAT IS TRAVELING WAVE FAULT LOCATION?Faults on the power transmission system cause transients that propagate along the transmission line as waves.These waves have a propagation velocity & characteristic impedance , travel from fault location towards line ends

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TRAVELING WAVE FAULT LOCATION THEORYTraveling wave fault locators make use of the transient signals generated by the fault.

Unlike other fault location systems, the traveling wave fault locator is unaffected by load conditions.

Precisely synchronized clocks are the key element in the implementation of this fault location technique.

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BENEFITS OF TRAVELING WAVE FAULT LOCATION

Early fault locators used radar.

Radar equipment is typically mobile or located at substations and requires manual operation.

GPS-based sub microsecond timing system has proven reliable in several utility traveling wave projects.

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POSSIBLE CAUSES OF FAULT

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FAULT LOCATION USING GPS

Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit. Originally intended for military applications

Allows precise determination oflocation, velocity, direction and time.

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HOW GPS WORKS?GPS satellites circle the earth twice a day .

Transmit signal information to earth.

Receivers take this information and calculate the user's exact location.

Accurate 3-D location require four satellites.

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ADVANTAGES

Protection of transmission line using GPS is extremely accurate.

Economical.

Fast response.

Reliability & availability

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CONCLUSION

Proposed technique is able to offer a high accuracy in fault location.

Unlike traditional protection schemes , this technique offers a new concept in network protection

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REFERENCES

Zhiqian Q Bo Weller, Tom Lomas and Miles A, Redfern Positional Protection of Transmission system Using global Positioning System IEEE Trans. On Power delivery, vol15 no 4 oct 2008

http://www.howstuffworks.com/gps

http://www.gisdevelopment.net/technology/gps

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