Time-domain line differential protection of electric power delivery systems
First Claim
1. A system configured to detect a fault in an electric power delivery system, comprising:
- a data acquisition subsystem configured to acquire a plurality of voltage traveling wave time-domain representations and a plurality of current traveling wave time-domain representations based on electrical conditions in the electric power delivery system;
a time-domain traveling wave directional subsystem configured to;
receive the plurality of current traveling wave time-domain representations and the plurality of voltage traveling wave time-domain representations;
generate a first comparison of the plurality of current traveling wave time-domain representations to a current minimum threshold;
generate a second comparison of the plurality of voltage traveling wave time-domain representations to a voltage minimum threshold;
determine an integral based on a product of the plurality of current traveling wave and the plurality of voltage traveling wave time-domain representations when the first comparison indicates that the plurality of current traveling wave time-domain representations exceed the current minimum threshold and the second comparison indicates that the plurality of voltage traveling wave time-domain representations exceed the voltage minimum threshold, a sign of the integral reflecting one of a forward or a reverse direction of the fault;
a fault detector subsystem configured to declare the fault when the sign reflects that the fault is in the forward direction and the integral exceeds a security margin; and
a protective action subsystem configured to implement a protective action on the electric power delivery system based on the declaration of the fault.
1 Assignment
0 Petitions
Accused Products
Abstract
The present disclosure relates to detection of faults in an electric power system. In one embodiment, a time-domain traveling wave directional subsystem is configured to receive a plurality of current traveling wave and a plurality of voltage traveling wave time-domain representations based on electrical conditions in the electric power delivery system. The plurality of current and voltage traveling wave time-domain representations may be compared to respective minimum thresholds. An integral may be generated based on a product of the plurality of current and voltage traveling wave time-domain representations when the current and voltage traveling wave time-domain representations exceed the minimum thresholds. A sign of the integral may reflect whether the fault is in the forward or reverse direction. A fault detector subsystem configured to declare the fault when the sign reflects that the fault is in the forward direction and the integral exceeds a security margin.
79 Citations
20 Claims
-
1. A system configured to detect a fault in an electric power delivery system, comprising:
-
a data acquisition subsystem configured to acquire a plurality of voltage traveling wave time-domain representations and a plurality of current traveling wave time-domain representations based on electrical conditions in the electric power delivery system; a time-domain traveling wave directional subsystem configured to; receive the plurality of current traveling wave time-domain representations and the plurality of voltage traveling wave time-domain representations; generate a first comparison of the plurality of current traveling wave time-domain representations to a current minimum threshold; generate a second comparison of the plurality of voltage traveling wave time-domain representations to a voltage minimum threshold; determine an integral based on a product of the plurality of current traveling wave and the plurality of voltage traveling wave time-domain representations when the first comparison indicates that the plurality of current traveling wave time-domain representations exceed the current minimum threshold and the second comparison indicates that the plurality of voltage traveling wave time-domain representations exceed the voltage minimum threshold, a sign of the integral reflecting one of a forward or a reverse direction of the fault; a fault detector subsystem configured to declare the fault when the sign reflects that the fault is in the forward direction and the integral exceeds a security margin; and a protective action subsystem configured to implement a protective action on the electric power delivery system based on the declaration of the fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method to detect a fault in an electric power delivery system, comprising:
-
acquiring a plurality of voltage traveling wave time-domain representations and a plurality of current traveling wave time-domain representations based on electrical conditions in the electric power delivery system; receiving the plurality of current traveling wave time-domain representations and the plurality of voltage traveling wave time-domain representations; generating a first comparison of the plurality of current traveling wave time-domain representations to a current minimum threshold; generating a second comparison of the plurality of voltage traveling wave time-domain representations to a voltage minimum threshold; determining an integral based on a product of the plurality of current traveling wave and the plurality of voltage traveling wave time-domain representations when the first comparison indicates that the plurality of current traveling wave time-domain representations exceed the current minimum threshold and the second comparison indicates that the plurality of voltage traveling wave time-domain representations exceed the voltage minimum threshold, a sign of the integral reflecting one of a forward or a reverse direction of the fault; declaring the fault when the sign reflects that the fault is in the forward direction and the integral exceeds a security margin; and implementing a protective action on the electric power delivery system based on the declaration of the fault. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification