Traveling wave based relay protection
First Claim
1. A method of protecting a power apparatus from a fault in an AC electrical power network that operates at a fundamental power frequency, the method comprising:
- receiving a first signal from a first Rogowski coil positioned to filter a first traveling wave current on a first transmission line of the AC electrical power network from a current component corresponding to the fundamental power frequency, wherein the first signal is indicative of a polarity of the first traveling wave;
receiving a second signal from a second Rogowski coil positioned to filter a second traveling wave current on a second transmission line of the network from a current component corresponding to the fundamental power frequency, wherein the second signal is indicative of a polarity of the second traveling wave;
determining, based on the first signal and the second signal, the location of the fault in the network;
halting a current flow on a transmission line of the network based on the determination of the fault location;
generating a first tracking pulse having a predetermined amplitude and width in response to a first detected traveling wave current that exceeds a first predetermined threshold value; and
generating a second tracking pulse having a predetermined amplitude and width in response to a second detected traveling wave current that exceeds a second predetermined threshold value.
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Accused Products
Abstract
An apparatus includes at least one Rogowski coil and a processor. The at least one Rogowski coil is positioned within an electrical power distribution network to detect a first traveling wave current caused by a fault on an electrical power transmission line of the network, generate a first signal indicative of detection of the first traveling wave, detect a second traveling wave current caused by the fault on the transmission line, and generate a second signal indicative of detection of the second traveling wave. The processor is adapted to receive the first signal and the second signal and to determine, based on the first signal and the second signal, where on the transmission line the fault occurred.
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Citations
16 Claims
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1. A method of protecting a power apparatus from a fault in an AC electrical power network that operates at a fundamental power frequency, the method comprising:
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receiving a first signal from a first Rogowski coil positioned to filter a first traveling wave current on a first transmission line of the AC electrical power network from a current component corresponding to the fundamental power frequency, wherein the first signal is indicative of a polarity of the first traveling wave; receiving a second signal from a second Rogowski coil positioned to filter a second traveling wave current on a second transmission line of the network from a current component corresponding to the fundamental power frequency, wherein the second signal is indicative of a polarity of the second traveling wave; determining, based on the first signal and the second signal, the location of the fault in the network; halting a current flow on a transmission line of the network based on the determination of the fault location; generating a first tracking pulse having a predetermined amplitude and width in response to a first detected traveling wave current that exceeds a first predetermined threshold value; and generating a second tracking pulse having a predetermined amplitude and width in response to a second detected traveling wave current that exceeds a second predetermined threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. An electrical protection apparatus comprising:
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a first Rogowski coil that filters a first traveling wave current on a first transmission line of an AC electrical power network from a current component corresponding to the fundamental power frequency and that generates a first signal indicative of a polarity of the first traveling wave caused by a fault within the network; a second Rogowski coil that filters a second traveling wave current on a second transmission line of the network from the current component corresponding to the fundamental power frequency and that generates a second signal indicative of a polarity of the second traveling wave caused by the fault within the network; and a protection device adapted to receive the first signal and the second signal and operable to; determine, based on the first signal and the second signal, where in the network the fault occurred, halt a current flow on a transmission line of the network based on the determination of where in the network the fault occurred, generate a first tracking pulse having a predetermined amplitude and width in response to a first detected traveling wave current that exceeds a first predetermined threshold value, and generate a second tracking pulse having a predetermined amplitude and width in response to a second detected traveling wave current that exceeds a second predetermined threshold value. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of protecting a power apparatus from a fault in a power network, the method comprising:
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receiving a first signal from a first Rogowski coil positioned to detect a first traveling wave current on a first transmission line of the network, wherein the first signal is indicative of a polarity of the first traveling wave; receiving a second signal from a second Rogowski coil positioned to detect a second traveling wave current on a second transmission line of the network, wherein the second signal is indicative of a polarity of the second traveling wave; determining, based on the first signal and the second signal, the location of the fault in the network; halting a current flow on a transmission line of the network based on the determination of the fault location; generating a first tracking pulse having a predetermined amplitude and width in response to a first detected traveling wave current that exceeds a first predetermined threshold value; and generating a second tracking pulse having a predetermined amplitude and width in response to a second detected traveling wave current that exceeds a second predetermined threshold value. - View Dependent Claims (13, 14, 15, 16)
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Specification