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Machine translation
12. (WO2012051104) APPARATUS AND METHOD FOR FAULT DETECTION AND LOCATION DETERMINATION
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

WHAT IS CLAIMED IS:

1. A method for determining the distance to electrical faults in electrical networks, the method comprising:

receiving an electrical waveform over an electrical power line;

determining a plurality of nominal electrical parameters for the electrical power network, the plurality of nominal electrical parameters associated with a state of the electrical power network in the absence of at least one transitory electrical fault in the network;

subsequently sampling a plurality of electrical parameters of the electrical waveform when the at least one transitory electrical fault exists in the network;

determining a plurality of inductances based at least in part upon a comparison of the nominal electrical parameters and the plurality of sampled electrical parameters, the plurality of inductances being representative of inductances present in the network when the at least one transitory electrical fault exists in the network;

analyzing the plurality of inductances to determine a distance to the at least one electrical fault.

2. The method of claim 1 wherein the plurality of sampled electrical parameters comprise voltages and currents.

3. The method of claim 1 further comprising determining a fault type based at least in part upon the plurality of sampled electrical parameters.

4. The method of claim 3 wherein the fault type is selected from the group consisting of a line-to-ground fault and a line-to-line fault.

5. The method of claim 1 wherein the comparison of the plurality of sampled parameters to the plurality of nominal electrical parameters is used to determine if a fault has occurred.

6. The method of claim 1 wherein the analyzing comprises multiplying at least some of the plurality of fault inductances by a known inductance characteristic of the power line to obtain the distance to the transitory fault.

7. The method of claim 1 wherein the comparison of the plurality of nominal electrical parameters and the plurality of sampled electrical parameters comprises a subtraction between the plurality of nominal electrical parameters and the plurality of sampled electrical parameters.

8. The method of claim 1 further comprising determining a source inductance based at least in part upon a comparison of the plurality of nominal electrical parameters and the plurality of sampled electrical parameters.

9. The method of claim 8 further comprising determining whether the transitory fault is located at particular location, the particular location selected from the group consisting of: an upstream location or a downstream location based at least in part upon a polarity of the determined source inductance; a same or different line in the same bus, based at least in part upon a polarity of the determined source inductance; and a same bus line or different bus line of multi-bus configuration, based at least in part upon a polarity of the determined source inductance.

10. A method of determining a distance to an electrical fault in an electrical network, the method comprising:

determining at least one first network operational parameter, the at least one first network operational parameter related to a first electrical condition of the network in the absence of a transitory fault;

determining at least one second network operational parameter, the at least one network operational second parameter related to a second electrical condition of the network in the

presence of the transitory fault;

determining an inductive distance to the fault based at least in part upon a comparison of the at least one first network operational parameter to the at least one second network operational parameter.

11. The method of claim 10 wherein determining the at least one second network operational parameter comprises sampling electrical voltages or electrical currents.

12. The method of claim 10 further comprising determining a fault type based at least in part upon at least one of the at least one first network operational parameter and the at least one second network operational parameter.

13. The method of claim 12 wherein the fault type is selected from the group consisting of a line-to-ground fault and a line-to-line fault.

14. The method of claim 10 wherein the comparing is used to determine if a fault has occurred.

15. A system for determining fault distance, the system comprising:

an interface with an input and an output, the interface configured to receive an electrical power waveform over an electrical power line at the input;

a processor, coupled to the interface, the processor configured to determine a plurality of nominal electrical parameters for the electrical power network, the nominal electrical parameters associated with a state of the electrical power network in the absence of at least one transitory electrical fault, the processor configure to subsequently sample a plurality of electrical parameters of the electrical power waveform at the input when the at least one transitory electrical fault exists in the network, the processor configured to determine a plurality of inductances based at least in part upon a comparison of the nominal electrical parameters and the plurality of sampled electrical parameters, the plurality of inductances being representative of inductances present in the network when the at least one transitory electrical fault exists in the network, the processor configured to analyze the plurality of inductances to determine a distance to the at least one transitory electrical fault and present the distance at the output.

16. The system of claim 15 wherein the plurality of sampled electrical parameters comprise electrical voltages and electrical currents.

17. The system of claim 15 further comprising determining a fault type based at least in part upon the plurality of sampled electrical parameters.

18. The system of claim 17 wherein the fault type is selected from the group consisting of a line-to-ground fault and a line-to-line fault.

19. The system of claim 15 wherein the comparison of the plurality of sampled electrical parameters to the plurality of nominal electrical parameters is used to determine if a fault has occurred.

20. The system of claim 15 wherein the distance to the at least one transitory fault is determined by multiplying at least some of the fault inductances by a known inductance characteristic of the power line.