System for detecting coolant leaks in generators

• US 9,759,630 B2
• Filed: 09/13/2016
• Issued: 09/12/2017
• Est. Priority Date: 04/10/2014
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Xu, James Jun, Grant, James Jonathan, Clark, James Wilson, Bjorklund, Marlowe Cameron
• Primary Examiner(s): Williams, Hezron E
• Assistant Examiner(s): Huang, David Z
• Application Number:
  US15/263,455
• Publication Number:
  US 20160377502A1
• Time in Patent Office: 364 Days
• Field of Search: 73 407
• CPC Class Codes: G01M 3/002 by using thermal means
• CPC Class Codes: G01M 3/20 using special tracer materials, e.g. dye, fluorescent material, radioactive material
• CPC Class Codes: G01M 3/228 for radiators
• CPC Class Codes: G01M 3/38 by using light G01M3/02 takes precedence
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 25/72 Investigating presence of flaws
• CPC Class Codes: G01N 33/004 for CO, CO2

Abstract

A system for detecting a gas leak in a generator includes a source of carbon dioxide gas, and a subsystem for introducing the carbon dioxide gas into the generator. An infrared imaging device is adapted to communicate with a notification device to display an image of at least a portion of the generator and the carbon dioxide gas. The infrared imaging device is a cooled detector and a filter with a spectral response between about 3 μm and about 5 μm. At least one of the detector and the filter is cooled to between about −80° C. and about −200° C. The gas leak will be indicated on the notification device.

Claims

1. A system for detecting a gas leak in a generator, the system comprising:

a source of carbon dioxide gas;

a subsystem for introducing the carbon dioxide gas into the generator;

an infrared imaging device adapted to communicate with a notification device to display an image of at least a portion of the generator and the carbon dioxide gas, the infrared imaging device comprising a cooled detector and a filter with a spectral response between 3 μ

m and 5 μ

m, wherein at least one of the detector and the filter is cooled to between −

80°

C. and −

200°

C., wherein the infrared imaging device is adapted to compare one or more previous video frames with a current video frame, identify a predetermined difference between the one or more previous video frames and the current video frame, assign a foreground color to pixels having the predetermined difference, the foreground color contrasting to the other pixels in a display of the notification device, and to display the pixels having the predetermined difference in the foreground color on the display, overlaid with the current video frame; and

wherein the gas leak will be indicated on the notification device.

2. The system of claim 1, wherein the generator is a hydrogen cooled generator that is on-line or on-grid.

3. The system of claim 2, wherein the spectral response of the filter is between 4.2 μ

m and 4.5 μ

m.

4. The system of claim 3, wherein both the detector and filter are cooled.

5. The system of claim 4, further comprising:

a movable cart that is configured to facilitate movement of the infrared imaging device and the notification device around the generator, or

the infrared imaging device is one of a handheld imaging device, a video camera, a smartphone, or a tablet.

6. The system of claim 3, wherein the subsystem is configured to remove some of the hydrogen to lower pressure in the generator by 2 PSI to 10 PSI, and to inject carbon dioxide into the generator until the pressure in the generator rises by 2 PSI to 10 PSI.

7. The system of claim 3, the subsystem including a weight measuring scale configured to monitor the weight of carbon dioxide used, so that introduction of carbon dioxide is ceased when a predetermined weight has been reached.

8. A system for detecting a gas leak in a dynamoelectric machine, the dynamoelectric machine is on-line, on-grid or on turning gears, the system comprising:

a source of a non-corrosive tracer gas;

a subsystem for introducing the non-corrosive tracer gas into the machine;

an infrared imaging device adapted to communicate with a notification device to display an image of at least a portion of the machine and the non-corrosive tracer gas, the infrared imaging device comprising a cooled detector and a filter with a spectral response between 3 μ

m and 5 μ

m, wherein at least one of the detector and the filter is cooled to between −

80°

C. and −

200°

C., wherein the infrared imaging device is adapted to compare one or more previous video frames with a current video frame, identify a predetermined difference between the one or more previous video frames and the current video frame, assign a foreground color to pixels having the predetermined difference, the foreground color contrasting to the other pixels in a display of the notification device, and to display the pixels having the predetermined difference in the foreground color on the display, overlaid with the current video frame; and

wherein the gas leak will be indicated on the notification device.

9. The system of claim 8, wherein the non-corrosive tracer gas is carbon dioxide (CO₂).

10. The system of claim 9, wherein the spectral response of the filter is between 4.2 μ

m and 4.5 μ

m.

11. The system of claim 10, wherein both the detector and the filter are cooled.

12. The system of claim 9, further comprising:

a movable cart that is configured to facilitate movement of the infrared imaging device and the notification device around the generator, or

the infrared imaging device is one of a handheld imaging device, a video camera, a smartphone, or a tablet.

13. The system of claim 9, wherein the subsystem is configured to remove some of the hydrogen to lower pressure in the generator by 2 PSI to 10 PSI, and to inject carbon dioxide into the generator until the pressure in the generator rises by 2 PSI to 10 PSI.

14. The system of claim 9, the subsystem including a weight measuring scale configured to monitor the weight of carbon dioxide used, so that introduction of carbon dioxide is ceased when a predetermined weight has been reached.

15. A system for detecting a gas leak in a hydrogen cooled generator that is on-line or on-grid, the system comprising:

a source of a non-corrosive tracer gas, the non-corrosive tracer gas is carbon dioxide (CO₂);

a subsystem for introducing the non-corrosive tracer gas into the hydrogen cooled generator;

an infrared imaging device adapted to communicate with a notification device to display an image of at least a portion of the generator and the non-corrosive tracer gas, the infrared imaging device comprising a cooled detector and a filter with a spectral response between 4.2 μ

m and 4.5 μ

m, wherein at least one of the detector and the filter is cooled to between −

80°

C. and −

200°

C., wherein the infrared imaging device is adapted to compare one or more previous video frames with a current video frame, identify a predetermined difference between the one or more previous video frames and the current video frame, assign a foreground color to pixels having the predetermined difference, the foreground color contrasting to the other pixels in a display of the notification device, and to display the pixels having the predetermined difference in the foreground color on the display, overlaid with the current video frame; and

wherein the gas leak will be indicated on the notification device.

16. The system of claim 15 wherein both the detector and filter are cooled.

17. The system of claim 15, further comprising:

a movable cart that is configured to facilitate movement of the infrared imaging device and the notification device around the generator, or

the infrared imaging device is one of a handheld imaging device, a video camera, a smartphone, or a tablet.

18. The system of claim 17, wherein the subsystem is configured to remove some of the hydrogen to lower pressure in the generator by 2 PSI to 10 PSI, and to inject carbon dioxide into the generator until the pressure in the generator rises by 2 PSI to 10 PSI.

19. The system of claim 18, the subsystem including a weight measuring scale configured to monitor the weight of carbon dioxide used, so that introduction of carbon dioxide is ceased when a predetermined weight has been reached.