Presentation on theme: "Fiber Optics in High Voltage Transmission Environments"— Presentation transcript:
1 Fiber Optics in High Voltage Transmission Environments EE October 8, 2003By: Jason Jones
2 My Reason for Choosing This Topic… Find a Combination Between Fiber Optics and Power EngineeringThis is looking at Fiber Optics in an alternative industryFig. 1Fig. 2
3 Overview Basics of fiber optic and electrical transmission lines Different uses of fiber optic cable in the transmission grid systemEmployment optionsConclusion/summary
4 Can high voltage electricity be sent through fiber optics cable? No conclusive evidence or research has shown that it is possible.Only the use of converters, still not practical for long distances and high voltage.
5 Why use fiber optics with transmission lines? Sensing and detection of electrical faults and failure(i.e –Supervisory Control and Data Acquisition Systems – S.C.A.D.A)Can be used as a neutral or ground.No EMC/EMI issues.Communication between plants and substationsExtensive ROW (Right Of Way). The cost advantages of existing ROW makes utilities attractive line-leasing partners for many communications carriers.
6 Combination of Two Different Concepts Fiber optic cablesTransmits light (photons)Primarily for communicationsElectric cablesTransmits electricity (electrons)Primarily for powering electrical devices
7 Most commonly used Fiber Optic All Dielectric Self Supporting (ADSS)Wrap typeOptical Ground Wire (OPGW)
8 Details of ADSS Cables High fiber count Cheaper than OPGW Details of ADSS CablesHigh fiber countCheaper than OPGWInstalled along electrical transmission linesFig. 3
9 Details of the OPGWOPGW is a composite wire which serves as a conventional overhead ground wire, with the added benefit of providing high-capacity and reliable fiber optic communication.Fig. 4
10 Common ProblemsContamination – fertilizer, pesticides, exhaust, emissions, salt fog. Can only be solved on the design level, difficult because of high voltage design requirementsSpace Potential – Electrical potential induced on fiber optic cablesDry Band Arcing – Caused by the induced current during wet conditions
11 Space Potential Induced voltages can be in the tens of kV range. Causes dry-band voltages and currents.Causes huge and powerful electric fields.Fig. 5
12 Dry Band ArcingCaused by Space Potential and frequency of current in the cable.Accurse in wet environmentsBecause of high induced voltage, current can be as low as 1.5mA.Fig. 6
13 Employment Options Phillips Corning Fiber Planners The Furukawa Electric Co.Most power utility companies (i.e. National Grid, Alliant Energy, Duke Energy)
14 Conclusion/Summary Many research possibilities. Very interesting employment.Good chance of becoming an expert.High Voltage – BE CAREFUL
15 References“Electrical Design Parameters of All-Dielectric-Self-Supporting Fiber Optic Cable”, M.W. Touminen and R.G Olsen, IEEE Transactions on Power Delievery, Vol. 15, No. 3, July 2000“Corona Caused Deterioration of ADSS Fiber-Optic Cable on High Voltage Lines”, G.G Karady, G. Besztercey, IEEE Transactions on Power Delievery, Vol. 15, No. 3, October 1999“Sensor Design for Leakage Current Measurement on ADSS Fiber-Optic Cable”, G.G Karady, Q, Huang, M.R Hernandez, D. Srinivasan, IEEE 2001