Electric power system circuit breaker trip diagnostic

Patent metadata

Field	Value
Publication number	US-9864008-B2
Application number	US-201414268927-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	Mar 31, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Disclosed herein are various systems and methods for monitoring the health of a circuit breaker. In various embodiments, a system may receive a voltage measurement across a trip coil assembly associated with a circuit breaker. The system may further receive a current measurement through the trip coil assembly. A plurality of transition points may be identified based on at least one of the voltage measurement and the current measurement, the plurality of transition points corresponding to at least one of a mechanical characteristic and an electrical characteristic of the circuit breaker during a trip event. A predictive analysis may be performed based at least in part on the plurality of transition points. An indication of the predictive health may be displayed.

First claim

What is claimed is:

1. A system for monitoring the health of a circuit breaker, comprising:
a first input configured to receive a voltage measurement across a trip coil assembly associated with a circuit breaker;
a second input configured to receive a current measurement through the trip coil assembly;
a processor in communication with the first input and the second input; and
a non-transitory computer-readable storage medium in communication with the processor, comprising instructions configured to cause the processor to:
identify a plurality of transition points based on at least one of the voltage measurement and the current measurement, the plurality of transition points corresponding to at least one of a mechanical characteristic and an electrical characteristic of the circuit breaker during a trip event;
perform a predictive analysis based at least in part on the plurality of transition points; and
display an indication of a predictive health of the circuit breaker based on the predictive analysis.

2. The system of claim 1 , wherein the computer-readable storage medium further comprises instructions configured to cause the processor to:
identify a problem associated with the circuit breaker; and
classify the problem as one of a mechanical problem and an electrical problem.

3. The system of claim 2 , wherein the computer-readable storage medium further comprises instructions configured to cause the processor to:
provide a maintenance recommendation to ameliorate the problem.

4. The system of claim 1 , wherein the first input comprises a voltage transformer in electrical communication with the trip coil assembly.

5. The system of claim 1 , wherein the second input comprises a current transformer in electrical communication with the trip coil assembly.

6. The system of claim 1 , further comprising:
a third input configured to receive a temperature measurement associated with the trip coil assembly; and
wherein the predictive analysis is further based at least in part on the temperature measurement.

7. The system of claim 1 , wherein the plurality of transition points define:
a first temporal section in which current through the trip coil rises from an initial value;
a second temporal section in which an armature of the circuit breaker moves;
a third temporal section in which the armature movement ceases and the current increases to a peak value; and
a fourth temporal section in which the current decreases from the peak value to the initial value.

8. The system of claim 7 , wherein the computer-readable storage medium further comprises instructions configured to cause the processor to:
calculate a total amount of charge flow through the trip coil for the third temporal section and the fourth temporal section;
compare the total amount of charge to an expected charge; and
determine an electrical problem based on a variation between the total amount of charge flow and the expected charge.

9. The system of claim 1 , wherein the computer-readable storage medium further comprises instructions configured to cause the processor to:
receive a plurality of user preferences; and
wherein the predictive analysis is further based on the user preferences.

10. The system of claim 9 , wherein the user preferences comprise an allowable deterioration of the trip coil and a degree of sensitivity of the trip coil.

11. The system of claim 1 , wherein the computer-readable storage medium further comprises instructions configured to cause the processor to:
receive a plurality of trip coil parameters; and
wherein the predictive analysis is further based on comparison of the plurality of trip coil parameters to the voltage measurement and the current measurement.

12. The system of claim 11 , wherein the plurality of trip coil parameters comprise at least one of: a trip coil rated current; a trip coil rated voltage; a circuit breaker rated temperature; and a trip coil resistance temperature coefficient.

13. A method for monitoring the health of a circuit breaker, comprising:
receiving a voltage measurement across a trip coil assembly associated with a circuit breaker;
receiving a current measurement through the trip coil assembly;
identifying a plurality of transition points based on at least one of the voltage measurement and the current measurement, the plurality of transition points corresponding to at least one of a mechanical characteristic and an electrical characteristic of the circuit breaker during a trip event;
performing a predictive analysis based at least in part on the plurality of transition points; and
displaying an indication of a predictive health of the circuit breaker based on the predictive analysis.

14. The method of claim 13 , further comprising:
identifying a problem associated with the circuit breaker; and
classifying the problem as one of a mechanical problem and an electrical problem.

15. The method of claim 14 , further comprising:
providing a maintenance recommendation to ameliorate the problem.

16. The method of claim 13 , further comprising:
receiving a temperature measurement associated with the trip coil assembly; and
wherein the predictive analysis is further based at least in part on the temperature measurement.

17. The method of claim 13 , further wherein the plurality of transition points define:
a first temporal section in which current through the trip coil rises from an initial value;
a second temporal section in which an armature of the circuit breaker moves;
a third temporal section in which the armature movement ceases and the current increases to a peak value; and
a fourth temporal section in which the current decreases from the peak value to the initial value.

18. The method of claim 17 , further comprising:
calculating a total amount of charge flow through the trip coil for the third temporal section and the fourth temporal section;
comparing the total amount of charge to an expected charge; and
determining an electrical problem based on a variation between the total amount of charge flow and the expected charge.

19. The method of claim 13 , further comprising:
receiving a plurality of user preferences; and
wherein the predictive analysis is further based on the user preferences.

20. The method of claim 13 , further comprising:
receiving a plurality of trip coil parameters; and
wherein the predictive analysis is further based on comparison of the plurality of trip coil parameters to the voltage measurement and the current measurement.

21. A system for monitoring the health of a circuit breaker, comprising:
a first input configured to receive a voltage measurement across a trip coil assembly associated with a circuit breaker;
a second input configured to receive a current measurement through the trip coil assembly;
a third input configured to receive a temperature measurement associated with the trip coil assembly;
a health monitoring component configured to:
receive a plurality of trip coil parameters;
identify a plurality of transition points based on at least one of the voltage measurement and the current measurement, the plurality of transition points corresponding to at least one of a mechanical characteristic and an electrical characteristic of the circuit breaker during a trip event;
perform a predictive analysis based at least in part on the plurality of transition points, the temperature measurement, and comparison of the plurality of trip coil parameters to the voltage measurement

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Biswas Saugata Swapan
• Srivastava Anurag K

Classifications

• G01R31/3275 Primary

  Fault detection or status indication · CPC title

• H02H3/044

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