Predictive maintenance of protective devices using wireless line sensors and systems

Patent metadata

Field	Value
Publication number	US-11372045-B2
Application number	US-202016752173-A
Country	US
Kind code	B2
Filing date	Jan 24, 2020
Priority date	Jan 24, 2020
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

Systems and methods to detect that a protective device is operating outside of a time inverse overcurrent tolerance region are described. For example, a central monitoring station may obtain a time inverse overcurrent tolerance region of a protective device on a power line. The central monitoring station may obtain a fault magnitude measurement and a fault duration measurement of a wireless line sensor on the power line. The central monitoring station may determine that the protective device is operating outside of the tolerance region based at least in part on the fault magnitude measurement and the fault duration measurement. The central monitoring station may provide a signal indicating that there is a potential issue with the protective device.

First claim

What is claimed is:

1. A non-transitory, tangible, computer-readable medium, having instructions stored thereon, wherein the instructions, when executed by a computer processor, cause the computer processor to:
obtain a tolerance region of a time inverse overcurrent curve of a protective device on a power line of an electric power delivery system;
obtain a fault magnitude measurement and a fault duration measurement of a wireless line sensor on the power line;
determine that the protective device is operating outside of the tolerance region based at least in part on the fault magnitude measurement and the fault duration measurement; and
provide a signal indicating that there is a potential issue with the protective device.

2. The non-transitory, computer-readable medium of claim 1 , wherein the instructions are configured to cause the processor to receive the fault magnitude measurement and the fault duration measurement from a wireless line sensor collector.

3. The non-transitory, computer-readable medium of claim 1 , wherein the tolerance region comprises plus or minus a predetermined amount of the time inverse overcurrent curve.

4. The non-transitory, computer-readable medium of claim 1 , wherein the instructions are configured to cause the processor to store operating parameters of the protective device at a central monitoring station of the electric power delivery system.

5. The non-transitory, computer-readable medium of claim 4 , wherein the operating parameters comprise a device type, a solenoid coil rating, a curve type, or any combination thereof.

6. The non-transitory, computer-readable medium of claim 1 , wherein the instructions are configured to cause the processor to store a time delay of the protective device with respect to another protective device.

7. The non-transitory, computer-readable medium of claim 1 , wherein the fault magnitude measurement comprises a current measurement that exceeds a threshold current.

8. A method, comprising:
obtaining a time inverse overcurrent tolerance region of a protective device on a power line;
obtaining a fault magnitude measurement and a fault duration measurement of a wireless line sensor on the power line;
determining that the protective device is operating outside of the tolerance region based at least in part on the fault magnitude measurement and the fault duration measurement; and
providing a signal indicating that there is a potential issue with the protective device.

9. The method of claim 8 , comprising associating the protective device with the wireless line sensor based on the wireless line sensor being co-located with the protective device.

10. The method of claim 8 , wherein the tolerance region comprises a preset tolerance percentage plus or minus of the time inverse overcurrent curve.

11. The method of claim 8 , comprising receiving a user input to associate the fault magnitude and the fault duration from the wireless line sensor with the operating conditions of the protective device.

12. The method of claim 8 , comprising determining whether the protective device achieved coordination with another protective device based on the fault magnitude measurement and the fault duration measurement.

13. The method of claim 8 , comprising obtaining the time inverse overcurrent tolerance region based on stored operating parameters of the protective device.

14. The method of claim 13 , wherein the operating parameters comprise a device type, a solenoid coil rating, a curve type, or any combination thereof.

15. The method of claim 8 , comprising displaying a notification to an operator on a display of a central monitoring station as the signal.

16. A central monitoring station, comprising:
a memory;
a processor operatively coupled to the memory, wherein the processor is configured to:
obtain a tolerance region of a time inverse overcurrent curve of a protective device on a power line of an electric power delivery system;
obtain a fault magnitude measurement and a fault duration measurement of a wireless line sensor on the power line;
determine that the protective device is operating outside of the tolerance region based at least in part on the fault magnitude measurement and the fault duration measurement; and
provide a signal indicating that there is a potential issue with the protective device.

17. The central monitoring station of claim 16 , wherein the processor is configured to obtain a topology of the electric power delivery system.

18. The central monitoring station of claim 16 , wherein the processor is configured to determine that the protective device and the wireless line sensor are co-located based on being installed on the same power line and being within a preset distance from each other.

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Achanta Shankar V
• Hao Kei

Classifications

• G01R31/3278

  of relays, solenoids or reed switches (measuring contact resistance G01R27/205; high voltage magnetic switches G01R31/3271, G01R31/333; testing electric windings G01R31/72; monitoring of fail safe circuits H01H47/002) · CPC title

• H02H1/0007

  concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445) · CPC title

• G01R31/3333 Primary

  Apparatus, systems or circuits therefor · CPC title

• H02H3/044 Primary

  Checking correct functioning of protective arrangements, e.g. by simulating a fault (for differential current circuit breakers H02H3/335) · CPC title

• H02H7/26

  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 title