Distributed bus differential protection using time-stamped data
First Claim
1. A device for providing distributed bus differential protection to an electrical power system, comprising:
- a communication module communicatively coupled to a plurality of intelligent electronic devices (IEDs) to receive current and dynamic topology measurements therefrom;
a topology processor communicatively coupled to the communication module and configured to determine a current topology of the electrical power system using the dynamic topology measurements, wherein the current topology comprises a plurality of bus differential protection zones where each of the bus differential protection zones includes one or more merged buses and branches connected thereto; and
a current differential element communicatively coupled to the communication module and the topology processor and configured to use current measurements from the branches of each bus differential protection zone of the determined current topology to provide differential protection for each of the plurality of bus differential protection zones.
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Accused Products
Abstract
A distributed busbar protection system using time-stamped data gathered from measurement devices in an electrical power system bus arrangement by respective intelligent electronic devices (IEDs). The IEDs may derive the timestamp information from a clock or other time source, which may be synchronized to a common time source and/or an absolute time. The time-stamped measurement data may be used by a protection device to monitor and/or protect the electrical power system. The protection device may include a real-time vector processor, which may time-align the time-stamped data, determine one or more bus differential protection zones, and implement a differential protection function within each of the protection zones. One or more protective control signals may be transmitted to the IEDs to trip the corresponding breakers and clear the bus fault.
66 Citations
26 Claims
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1. A device for providing distributed bus differential protection to an electrical power system, comprising:
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a communication module communicatively coupled to a plurality of intelligent electronic devices (IEDs) to receive current and dynamic topology measurements therefrom; a topology processor communicatively coupled to the communication module and configured to determine a current topology of the electrical power system using the dynamic topology measurements, wherein the current topology comprises a plurality of bus differential protection zones where each of the bus differential protection zones includes one or more merged buses and branches connected thereto; and a current differential element communicatively coupled to the communication module and the topology processor and configured to use current measurements from the branches of each bus differential protection zone of the determined current topology to provide differential protection for each of the plurality of bus differential protection zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 24)
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15. A method for providing distributed bus differential protection in an electrical power system, the method comprising:
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receiving time-stamped current measurements and dynamic topology measurements from a plurality of intelligent electronic devices (IEDs) distributed within an electrical power system, wherein each of the plurality of IEDs is electrically coupled to respective portions of the power system to obtain measurement data therefrom; time-aligning the current measurements to produce time-aligned current measurements; determining a current topology of the electrical power system using the dynamic topology measurements, wherein the current topology comprises a plurality of bus differential protection zones (BDPZs), where each of the BDPZs includes one or more merged buses and branches connected thereto; providing differential protection for each BDPZ, wherein providing differential protection for a particular BDPZ comprises evaluating a current differential operating condition of the BDPZ using the time-aligned current measurements from the branches thereof and detecting a bus fault within the BDPZ when the operating condition is satisfied; and transmitting a protective control signal to an IED responsive to detecting a bus fault within the particular BDPZ. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 25)
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23. A computer-readable storage medium comprising instructions to cause a computing device to perform a method, comprising:
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receiving time-stamped measurement data from plural intelligent electronic devices (IEDs) distributed within an electrical power system, the time-stamped measurement data comprising time-stamped current measurements and dynamic topology measurements, wherein the IEDs are synchronized to a common time source; time-aligning the time-stamped current measurements to produce time-aligned current measurements; determining a current topology of the electrical power system using the dynamic topology measurements and a static topology of the electrical power system, wherein the current topology comprises a plurality of bus differential protection zones (BDPZs), where each of the BDPZs includes one or more merged buses and branches connected thereto; providing differential protection for each of the BDPZs, wherein providing differential protection for a particular BDPZ comprises, calculating an operating current and a restraining current of the particular BDPZ using the time-aligned current measurements from the branches of the particular BDPZ of the determined current topology, detecting an external fault state of the electrical power system, scaling the restraining current by a selected one of a plurality of slope characteristics to produce a scaled restraining current, wherein the slope characteristic is selected according to the detected external fault state, and detecting a bus fault when the operating current is greater than the scaled restraining current and a pickup current threshold for a selected time threshold, wherein the time threshold is selected according to the detected external fault state, and transmitting one or more protective control signals to one or more of the IEDs responsive to detecting a bus fault in one or more of the BDPZs. - View Dependent Claims (26)
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Specification