Transmission line protection using traveling waves in optical ground wire fiber
First Claim
1. A system configured to monitor an optical ground wire (OPGW) fiber associated with an electric power line, comprising:
- a state of polarization (SOP) detection subsystem to detect a change in at least one polarization parameter of optical radiation carried by the OPGW fiber and caused by a disturbance on the electric power line;
a digitization subsystem configured to create a first digitized representation of the at least one polarization parameter; and
an intelligent electronic device (IED) in communication with the SOP detection system, comprising;
an input configured to receive the first digitized representation of the at least one polarization parameter;
a SOP traveling wave (TW) subsystem configured to identify a SOP TW based on a change in the SOP indicated by the first digitized representation, anda protection subsystem in communication with the SOP TW subsystem configured to implement a protective action in response to identification of the SOP TW.
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Accused Products
Abstract
Disclosed herein are systems for detecting a location of a fault on an electric power transmission line using a state-of-polarization traveling wave in an optical ground wire. Various embodiments may also detect a traveling wave on a conductor of the transmission system. The arrival times of the state-of-polarization traveling wave and the electrical traveling wave may be compared. Using the difference in times and the known propagation velocities of the traveling waves, a distance to the fault may be calculated. Arrival time of the state-of-polarization traveling wave may be calculated using electrical signals from photodetectors in an optical channel with polarizing filters at different orientations or reference frames.
30 Citations
14 Claims
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1. A system configured to monitor an optical ground wire (OPGW) fiber associated with an electric power line, comprising:
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a state of polarization (SOP) detection subsystem to detect a change in at least one polarization parameter of optical radiation carried by the OPGW fiber and caused by a disturbance on the electric power line; a digitization subsystem configured to create a first digitized representation of the at least one polarization parameter; and an intelligent electronic device (IED) in communication with the SOP detection system, comprising; an input configured to receive the first digitized representation of the at least one polarization parameter; a SOP traveling wave (TW) subsystem configured to identify a SOP TW based on a change in the SOP indicated by the first digitized representation, and a protection subsystem in communication with the SOP TW subsystem configured to implement a protective action in response to identification of the SOP TW. - View Dependent Claims (2, 3, 4, 5)
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6. A system configured to detect a disturbance in an electrical power system and implement a protective action, comprising:
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a state of polarization (SOP) traveling wave (TW) detection subsystem in communication with an optical ground wire (OPGW) fiber associated with an electric power line, and configured to detect the disturbance in the electrical power system based on a change in at least one polarization parameter of optical radiation carried by the OPGW fiber; and
,a protection subsystem in communication with the SOP TW detection subsystem, configured to implement a protective action on the electrical power system in response to detection of the disturbance in the electrical power system based on the change of at least one polarization parameter of optical radiation carried by the OPGW fiber. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for detecting a disturbance in an electrical power system and implementing a protective action, the method comprising:
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receiving optical radiation carried by an optical ground wire (OPGW) fiber associated with an electric power line in the electric power system; passing the optical radiation through a plurality of polarized filters; detecting transmission of the optical radiation through the plurality of polarized filters; creating a first digitized representation of the optical radiation transmitted through the plurality of polarized filters; detecting a change in the digitized representation of the optical radiation; identifying a state of polarization (SOP) traveling wave (TW) based on the change in the digitized representation of the optical radiation; and
,implementing a protective action based on the identification of the SOP TW. - View Dependent Claims (13, 14)
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Specification