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;
a first input configured to receive the first digitized representation of the at least one polarization parameter;
a second input configured to receive a second digitized representation of an electrical signal associated with the electric power line;
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, andan electrical traveling wave module configured to identify an electrical TW based on the second digitized representation; and
a protection subsystem in communication with the SOP module and the traveling wave module configured to implement a protective action in response to identification of the SOP TW and the electrical 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.
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Citations
20 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; a first input configured to receive the first digitized representation of the at least one polarization parameter; a second input configured to receive a second digitized representation of an electrical signal associated with the electric power line; 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 an electrical traveling wave module configured to identify an electrical TW based on the second digitized representation; and a protection subsystem in communication with the SOP module and the traveling wave module configured to implement a protective action in response to identification of the SOP TW and the electrical TW. - View Dependent Claims (2, 3, 4, 5, 6, 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; receiving a second digitized representation of an electrical signal associated with the electric power line; identifying an electrical TW based on the second digitized representation;
implementing a protective action based on the identification of the SOP TW and the electrical TW. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification