Time signal manipulation and spoofing detection based on a latency of a communication system
First Claim
1. An intelligent electronic device (IED), comprising:
- a time input configured to receive a time signal;
a monitored equipment interface in electrical communication with an electric power system at a first location, wherein the monitored equipment interface is configured to obtain a first measurement of electrical conditions at the first location at a first time based on the time signal;
a communications interface configured to receive via a communication system a second measurement of electrical conditions obtained at a second location by another IED and at the first time based on the time signal;
a latency determination subsystem in communication with the time input, monitored equipment interface, and communications interface and configured to determine a latency based on a comparison between a second time in which the second measurement is received by the IED via the communication system and the first time;
a threshold subsystem configured to generate an indication of whether the latency exceeds a first threshold;
an anomalous condition subsystem configured to identify an anomalous condition based on the indication; and
a remedial action subsystem configured to exclude the second measurement from a control action of the electric power system when the latency exceeds the first threshold.
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Accused Products
Abstract
This disclosure relates to detecting manipulation or spoofing of a time based on a latency of a communication system. In one embodiment, a system includes a time input to receive a time signal. The system includes a first interface to receive a first representation of a first condition at a first location at a first time and a second interface to receive a second representation of a second condition at a second location and at the first time. A latency determination subsystem may determine a latency based on a comparison of the time of arrival of the second measurement and the first time. A threshold subsystem may generate an indication of whether the latency satisfies a threshold. An anomalous condition subsystem may identify an anomalous condition based on the indication, and a remedial action may be implemented based on the anomalous condition.
113 Citations
19 Claims
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1. An intelligent electronic device (IED), comprising:
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a time input configured to receive a time signal; a monitored equipment interface in electrical communication with an electric power system at a first location, wherein the monitored equipment interface is configured to obtain a first measurement of electrical conditions at the first location at a first time based on the time signal; a communications interface configured to receive via a communication system a second measurement of electrical conditions obtained at a second location by another IED and at the first time based on the time signal; a latency determination subsystem in communication with the time input, monitored equipment interface, and communications interface and configured to determine a latency based on a comparison between a second time in which the second measurement is received by the IED via the communication system and the first time; a threshold subsystem configured to generate an indication of whether the latency exceeds a first threshold; an anomalous condition subsystem configured to identify an anomalous condition based on the indication; and a remedial action subsystem configured to exclude the second measurement from a control action of the electric power system when the latency exceeds the first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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receiving a time signal at each of a first location and a second location; generating, via a first intelligent electronic device (IED) at the first location, a first measurement of electrical conditions at the first location at a first time based on the time signal; generating, via a second IED at the second location, a second measurement of electrical conditions at the second location at the first time based on the time signal; transmitting the second measurement from the second IED through a communication system to the first IED; determining a latency based on a comparison between a second time in which the second measurement is received by the first IED and the first time; generating an indication of whether the latency exceeds a first threshold; identifying an anomalous condition based on the indication; and excluding the second measurement from a control action of an electric power system when the latency exceeds the first threshold. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system, comprising:
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a time input configured to receive a time signal; a monitored equipment interface configured to receive, via measuring conditions of a power delivery system, a first representation of a first condition at a first location at a first time based on the time signal; a communications interface configured to receive, via a communication system, a second representation of a second condition at a second location and at the first time based on the time signal; a latency determination subsystem in communication with the time input, monitored equipment interface, and the communications interface and configured to determine a latency based on a comparison between a second time in which the second measurement is received by the second interface through the communication system and the first time; a threshold subsystem configured to generate an indication of whether the latency exceeds a threshold; an anomalous condition subsystem configured to identify an anomalous condition based on the indication; and a remedial action subsystem configured to exclude the second measurement from a control action of an electric power system when the latency exceeds the first threshold.
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Specification