Fault location using traveling waves

• US 8,781,766 B2
• Filed: 11/12/2013
• Issued: 07/15/2014
• Est. Priority Date: 10/12/2011
• Status: Active Grant

• Current Assignee: Schweitzer Engineering Laboratories, Incorporated
• Original Assignee: Schweitzer Engineering Laboratories, Incorporated
• Inventors: Schweitzer, Edmund O. III, Guzman-Casillas, Armando, Skendzic, Veselin, Mynam, Mangaoathirao Venkata
• Primary Examiner(s): Kundu, Sujoy
• Assistant Examiner(s): SUAREZ, FELIX E
• Application Number:
  US14/078,055
• Publication Number:
  US 20140074414A1
• Time in Patent Office: 245 Days
• Field of Search: 702/57, 702/58, 702/59, 702/62, 702/172, 702/183, 702/188, 702/189, 324/535
• US Class Current: 702/59
• CPC Class Codes: G01R 31/085 in power transmission or distribution lines, e.g. overhead
• CPC Class Codes: G01R 31/088 Aspects of digital computing
• CPC Class Codes: H02H 7/26 Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured locating faults in cables G01R31/08
• CPC Class Codes: H02H 7/261 involving signal transmission between at least two stations transmission of signals in general H02H1/0061
• CPC Class Codes: H02H 7/265 making use of travelling wave theory

Abstract

Disclosed herein are various embodiments of systems and methods for calculating a fault location in electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system. According to one embodiment, an intelligent electronic device may be configured to detect a transient traveling wave caused by an electrical fault. A first traveling wave value of the transient traveling wave may be determined and a corresponding first time associated with the first traveling wave may be determined. The IED may receive a second time associated with a second traveling wave value of the transient traveling wave detected by a remote IED. The distance to the remote IED may be known. An estimated fault location may be generated based on the time difference between the first time and the second time. Additional methods of calculating the fault location may also be employed.

Claims

1. A receiving intelligent electronic device (IED) configured to calculate a fault location in an electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system, the receiving IED comprising:

a communications port;

control logic in communication with the communications port, the control logic configured to;

detect a transient traveling wave caused by an electrical fault by using a plurality of data samples representing measurements of a parameter of the electric power delivery system;

detect a first value of the transient traveling wave;

detect a first time associated with the first value;

compensate the first time based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the receiving IED, the secondary cable from the electric power delivery system to the receiving IED; and

,

generate an estimated fault location based on the first time.

2. The IED of claim 1, wherein the control logic is further configured to:

receive via the communication port a second time associated with a second value of the transient traveling wave detected by a remote IED located at a known distance from the receiving IED; and

generate the estimated fault location based on a difference between the first time and the second time.

3. The IED of claim 1, wherein the control logic is further configured to:

receive via the communication port a second time associated with a second value of the transient traveling wave detected by a remote IED located at a known distance from the receiving IED;

detect a first polarity of the transient traveling wave;

receive via the communication port a second polarity of the transient traveling wave; and

,

when the first polarity is the same as the second polarity, generate the estimated fault location.

4. The IED of claim 3, wherein the control logic is further configured to:

compensate the second time based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the remote IED.

5. The IED of claim 1, wherein the control logic is further configured to generate an estimated fault location based upon a negative-sequence current measurement received from a remote IED located at a known distance from the receiving IED.

6. The IED of claim 1, wherein the control logic is further configured to generate an estimated fault location based upon electrical parameters measurable from a single location in the electric power delivery system.

7. The IED of claim 1, wherein:

the control logic is further configured to generate the estimated fault location based on the data available for;

the fault location based on the first time;

the fault location based upon the negative-sequence current measurement received from a remote IED located at a known distance from the receiving IED; and

,

the fault location based upon the electrical parameters measurable from a single location in the electric power delivery system.

8. An intelligent electronic device (IED) configured to calculate an estimated fault location in an electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system, comprising:

a data bus;

a processor in communication with the data bus;

a non-transitory computer readable storage medium in communication with the data bus, the non-transitory computer readable storage medium comprising;

a traveling wave fault location estimation module configured to;

generate a fault location based on a first time associated with a first value of a transient traveling wave detected at a first location and caused by an electrical fault, wherein the first time is adjusted based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the first IED, the secondary cable from the electric power delivery system to the IED;

a multi-end fault location estimation module configured to generate the fault location based on;

a first negative-sequence current measurement made at the first location; and

,

a second negative-sequence current measurement made at the second location; and

,

a single-end location fault location estimation module configured to generate the fault location based on electrical parameters measurable from a single location in the electric power delivery system;

wherein, the IED is configured to generate an estimated fault location using one of the traveling wave fault location estimation module, the multi-end fault location estimation module, and the single-end location fault location estimation module based upon available data.

9. The IED of claim 8, wherein the traveling wave fault location estimation module is further configured to generate a fault location based on a second time associated with a second value of the transient traveling wave detected at a second location a known distance from the first location.

10. The IED of claim 8, wherein the traveling wave fault location estimation module, the multi-end fault location estimation module, and the single-end location fault location estimation module are each associated with a priority, and wherein the estimated fault location is calculated by the module having sufficient available data and having the highest priority.

11. A system for calculating a fault location on an electric power delivery system using a detected traveling wave created by an electrical fault in the electric power delivery system, comprising:

a communication medium between a first intelligent electronic device (IED) and a second IED;

the first IED comprising;

a first communications port in communication with the communication medium;

first control logic in communication with the first communications port and configured to;

detect a transient traveling wave caused by an electrical fault by using a first plurality of data samples representing measurements of a first parameter of the electric power delivery system;

detect a first value of the transient traveling wave;

detect a first time associated with the first value;

adjust the first time based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the first IED, the secondary cable from the electric power delivery system to the first IED;

wherein the control logic of the first IED is further configured to generate an estimated fault location based on the first time.

12. The system of claim 11, the second IED located a known distance from the first IED, the second IED comprising:

a second communications port in communication with the communication medium;

second control logic in communication with the second communications port and configured to;

detect the transient traveling wave caused by the electrical fault by using a second plurality of data samples representing measurements of a second parameter of the electric power delivery system;

detect a second value of the transient traveling wave;

detect a second time associated with the second value;

transmit the second time associated with the second value to the first IED;

wherein the control logic of the first IED is further configured to generate an estimated fault location based on the first time and the second time.

13. The system of claim 12, wherein the second control logic is further configured to adjust the second time based on a delay associated with propagation of the transient traveling wave in a secondary cable of a known length in communication with the second IED.

14. An intelligent electronic device (IED) for protection of a portion of an electric power delivery system, configured to calculate a fault location in the electric power delivery system based on a traveling wave created by an electrical fault in the electric power delivery system, the IED comprising:

a data bus;

a processor in communication with the data bus;

a non-transitory computer readable storage in communication with the data bus, the non-transitory computer readable storage medium comprising;

a protection element for determining a protection action for the portion of the electric power delivery system;

a traveling wave fault location estimation module configured to generate a fault location based on;

a first time associated with a first value of a transient traveling wave detected at a first location and caused by the electrical fault and adjusted based on a delay associated with propagation of the transient traveling wave in a secondary cable of known length in communication with the IED, the secondary cable from the electric power delivery system to the IED; and

,

a line propagation velocity;

wherein the fault location is used by the protection element.

15. The IED of claim 14, wherein the traveling wave fault location estimation module is further configured to generate a fault location based on a second time associated with a second value of a transient traveling wave detected at a first location and caused by the electrical fault.

16. The IED of claim 15, wherein the second time is adjusted based on a delay associated with propagation of the transient traveling wave in another secondary cable of known length.

17. The IED of claim 14, wherein the first value comprises a first peak value.

18. The IED of claim 14, wherein the first value comprises a first arrival value.

19. The IED of claim 14, wherein the traveling wave fault location estimation module is further configured to generate an estimated fault location based upon voltage and/or current measurements.