ENHANCED OPTICAL CONDITION MONITORING SYSTEM FOR POWER TRANSFORMER AND METHOD FOR OPERATING POWER TRANSFORMER

• US 20180128673A1
• Filed: 04/15/2016
• Published: 05/10/2018
• Est. Priority Date: 04/17/2015
• Status: Active Grant

• Current Assignee: Micatu Inc.
• Original Assignee: Micatu Inc.
• Inventors: OSHETSKI, Michael, PRADHAN, Atul
• Granted Patent: US 10,215,621 B2
• Time in Patent Office: Days
• CPC Class Codes: G01H 9/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
• CPC Class Codes: G01H 9/004 using fibre optic sensors light guides per se G02B6/00, acousto-optical devices specially adapted for gating or modulating in optical wave guides G02F1/125
• CPC Class Codes: G01R 31/62 Testing of transformers
• CPC Class Codes: H01F 2027/404 Protective devices specially adapted for fluid filled transformers
• CPC Class Codes: H01F 27/402 Association of measuring or protective means
• CPC Class Codes: H02H 7/04 for transformers

Abstract

The present technology relates a transformer condition monitoring system including a light source configured to produce an emitted light beam. A plurality of optical sensors are configured to be positioned at a plurality of separate locations on a transformer, receive the light beam from the light source, and generate product light beams from the emitted light beam. A detector is positioned to receive the product light beams from the optical sensors and is configured to measure intensity values of the product light beams for each of the optical sensors. A computing device is coupled to the detector and includes a processor coupled to a memory. The processor executes programmed instructions stored in the memory to determine, based on the measured intensity values for the product light beams for the optical sensors, at least a displacement value, a current value, and a voltage value for the transformer.

Claims

1. A transformer condition monitoring system comprising:

a light source configured to produce an emitted light beam;

a plurality of optical sensors configured to be positioned at a plurality of separate locations on a transformer and to receive the emitted light beam from the light source, wherein each of the plurality of optical sensors is configured to generate one or more product light beams from the emitted light beam, the plurality of optical sensors comprising at least one vibration sensor, at least one voltage sensor, and at least one current sensor;

a detector positioned to receive the one or more product light beams generated from each of the plurality of optical sensors, the detector configured to measure intensity values of the one or more product light beams for each of the plurality of optical sensors; and

a computing device coupled to the detector, the computing device comprising a processor and a memory coupled to the processor, wherein the processor executes programmed instructions stored in the memory to determine, based on the measured intensity values for the one or more product light beams for each of the plurality of optical sensors, at least a displacement value, a current value, and a voltage value for the transformer.

2. The system of claim 1, wherein the displacement value comprises an angular displacement and the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine an angular velocity value or an angular acceleration value for the transformer based on the determined displacement value over time.

4. The system of claim 1, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine a vibrational frequency based on the displacement value over time.

5. The system of claim 1, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to:

compare each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to a plurality of corresponding historical displacement values, current values, and voltage values for the transformer; and

determine, based on the compared values, a potential failure state of the transformer.

6. The system of claim 1, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to:

compare each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to corresponding standard operating displacement values, current values, and voltage values for the transformer;

determine, based on the compared values, whether a difference between the determined values and the corresponding standard values exceeds a threshold value;

identify a potential failure state of the transformer when the difference between the determined values and the corresponding standard values exceeds the threshold value; and

provide an instruction to the transformer to change at least one control system operation status based on the identified potential failure state, wherein the at least one control operation comprises at least one of a peak load, a generator output, or an operating temperature.

9. The system of claim 1, wherein the at least one vibration sensor comprises an etalon positioned to receive the emitted light beam from the light source and configured to generate a plurality of product light beams from the emitted light beam, the etalon being mounted to a support structure at one or more pivot points, wherein the displacement value is determined based on a change in position of the etalon relative to the one or more pivot points, and wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine an acceleration value based on the determined change in position of the etalon relative to the one or more pivot points.

19. A method for monitoring a condition of a transformer, the method comprising:

providing the transformer condition monitoring system of claim 1;

coupling the plurality of optical sensors to the transformer;

measuring the intensity values for the one or more product light beams for each of the plurality of optical sensors over a period of time;

determining, based on the measured intensity values for the one or more product light beams for each of the plurality of optical sensors, at least a displacement value, a current value, and a voltage value for the transformer over the period of time;

monitoring the determined displacement value, the determined current value, and the determined voltage value for changes over the period of time to monitor the condition of the transformer.

20. The method of claim 19, wherein the displacement value comprises an angular displacement, the method further comprising:

determining an angular velocity value or an angular acceleration value for the transformer based on the determined displacement value over time; and

monitoring the determined angular velocity value or the determined angular acceleration value for changes over the period of time to monitor the condition of the transformer.

22. The method of claim 19 further comprising:

determining a vibrational frequency based on the displacement value over time;

monitoring the determined vibrational frequency value or the determined for changes over the period of time to monitor the condition of the transformer.

23. The method of claim 19, wherein the monitoring further comprises:

comparing each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to a plurality of corresponding historical displacement values, current values, and voltage values for the transformer; and

determining, based on the compared values, a potential failure state of the transformer.

24. The method of claim 19, wherein the monitoring further comprises:

comparing each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to corresponding standard operating displacement values, current values, and voltage values for the transformer;

determining, based on the compared values, whether a difference between the determined values and the corresponding standard values exceeds a threshold value;

identifying a potential failure state of the transformer when the difference between the determined values and the corresponding standard values exceeds the threshold value; and

changing at least one control system operation status of the transformer based on the identified potential failure state, wherein the at least one control operation status comprises at least one of a peak load, a generator output, or an operating temperature.

27. The method of claim 19, wherein the at least one vibration sensor comprises an etalon positioned to receive the emitted light beam from the light source and configured to generate a plurality of product light beams from the emitted light beam, the etalon being mounted to a support structure at one or more pivot points, wherein the displacement value is determined based on a change in position of the etalon relative to the one or more pivot points, the method further comprising determining an acceleration value based on the determined change in position of the etalon relative to the one or more pivot points.

35. The method as set forth in claim 19, wherein the at least one voltage sensor and at least one current sensor are coupled to one or more electrical insulation bushings of the transformer.

36. The method as set forth in claim 19, wherein the system comprises a plurality of vibrational sensors located at least at a core of the transformer, on a case of the transformer, on one or more support frame members of the transformer, or on one or more windings of the transformer.

39. A transformer comprising the transformer condition monitoring system of claim 1, wherein the plurality of optical sensors are positioned at a plurality of separate locations on the transformer.

40. The transformer of claim 39, wherein the displacement value comprises an angular displacement, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine an angular velocity value or an angular acceleration value for the transformer based on the determined displacement value over time.

42. The transformer of claim 39, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine a vibrational frequency based on the displacement value over time.

43. The transformer of claim 39, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to:

compare each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to a plurality of corresponding historical displacement values, current values, and voltage values for the transformer; and

determine, based on the compared values, a potential failure state of the transformer.

44. The transformer of claim 39, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to:

compare each of the determined displacement value, the determined current value, and the determined voltage value for the transformer to corresponding standard operating displacement values, current values, and voltage values for the transformer;

determine, based on the compared values, whether a difference between the determined values and the corresponding standard values exceeds a threshold value;

identify a potential failure state of the transformer when the difference between the determined values and the corresponding standard values exceeds the threshold value; and

provide an instruction to the transformer to change at least one control system operation status based on the identified potential failure state, wherein the at least one control operation status comprises at least one of a peak load, a generator output, or an operating temperature.

47. The transformer of claim 39, wherein the at least one vibration sensor comprises an etalon positioned to receive the emitted light beam from the light source and configured to generate a plurality of product light beams from the emitted light beam, the etalon being mounted to a support structure at one or more pivot points, wherein the displacement value is determined based on a change in position of the etalon relative to the one or more pivot points, wherein the processor is further configured to execute at least one additional programmed instruction stored in the memory to determine an acceleration value based on the determined change in position of the etalon relative to the one or more pivot points.

56. The transformer of claim 39, wherein a plurality of vibrational sensors are located at least at a core of the transformer, on a case of the transformer, on one or more support frame members of the transformer, or on one or more windings of the transformer.

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