Method for a reliability assessment, failure prediction and operating condition determination of electric equipment

• US 6,928,861 B1
• Filed: 02/17/2004
• Issued: 08/16/2005
• Est. Priority Date: 03/17/2000
• Status: Expired due to Term

• Current Assignee: 4R Enterprises Incorporated
• Original Assignee: Norman Rice
• Inventors: Rice, Norman
• Primary Examiner(s): CYGAN, MICHAEL T
• Application Number:
  US10/781,079
• Time in Patent Office: 546 Days
• Field of Search: 73/530.1, 73/530.7, 73/614.2, 73/617.1, 73/617.2, 324/71.4, 324/204
• US Class Current: 73/61.42
• CPC Class Codes: G01N 15/04 Investigating sedimentation of particle suspensions
• CPC Class Codes: G01N 33/2858 metal particles

Abstract

The present invention is directed to a method for analyzing the maintenance status of liquid-filled electric equipment. An accurate indication of the maintenance state of an electric device and its insulating liquid is obtained using an analysis method comprising a particle analysis of suspended particles and sediment contained in the liquid. The analysis method can further comprise a chemical analysis of the insulating liquid. This analysis results in profiles of the liquid that give an accurate indication of the maintenance state of the electric device.

Claims

1. A method for a reliability assessment, failure prediction and operating condition determination of electrical equipment comprising:

providing a profile of wear products and breakdown products; and

assessing reliability, and predicting failure and operating condition of the electrical equipment based on evaluation of the profile of wear products and breakdown products,

wherein the step of providing a profile includes providing information pertaining to the presence of non-particulate components, including the presence of non-volatile insulating liquid degradation products, and providing information pertaining to the presence of hydrocarbons, water, nitrates, alkanes, hydroxyls, oxides, sulfates, coking and viscosity.

2. A method for a reliability assessment, failure prediction and operating condition determination of electrical equipment comprising:

providing a profile of wear products and breakdown products; and

assessing reliability, and predicting failure and operating condition of the electrical equipment based on evaluation of the profile of wear products and breakdown products,

wherein the step of providing a profile includes providing information pertaining to the particle count, particle count distribution, particle count concentration, particle count composition, particle count shape, coking, oxidation, nitration, sulfate, alkanes, moisture, particle type composition, particle size and particle shape, and non-particulate components, including the presence of non-volatile insulating liquid degradation products.

3. A method for a reliability assessment, failure prediction and operating condition determination of electrical equipment comprising:

providing a profile of wear products and breakdown products contained within the electrical equipment; and

assessing reliability, and predicting failure and operating condition of the electrical equipment based on evaluation of the profile of wear products and breakdown products,

wherein the electrical equipment is selected from the group consisting of transformers, load tap changes, tap changers, circuit breakers, off-load tap changes, on-load tap changers, switches, x-ray machines and electrical discharge machines.

4. The method according to claim 3, wherein the step of assessing reliability, and predicting failure and operating condition includes comparing the profile to a standardized profile.

5. The method according to claim 3, wherein the step of providing a profile includes providing information pertaining to the presence of techtites.

6. The method according to claim 3, wherein the step of providing a profile includes providing information pertaining to the presence of filming, fibers, coking, techtites, ferrous and non-ferrous particles, oxides, and tempered metallic particles.

7. The method according to claim 3, wherein the step of providing a profile includes providing information pertaining to the presence of non-particulate components, including the presence of non-volatile insulating liquid degradation products.

8. The method according to claim 7, wherein the step of providing a profile includes providing information pertaining to the presence of hydrocarbons.

9. A power transmission electrical equipment operating condition determination method comprising:

providing a profile of wear products and breakdown products within the power transmission electrical equipment; and

assessing reliability, and predicting failure and operating condition of the power transmission electrical equipment based on evaluation of the profile of wear products and breakdown products.

10. The method according to claim 9, wherein the step of providing a profile includes providing information pertaining to the presence of techtites.

11. The method according to claim 9, wherein the step of providing a profile includes providing information pertaining to the presence of filming, fibers, coking, techtites, ferrous and non-ferrous particles, oxides, and tempered metallic particles.

12. The method according to claim 9, wherein the step of providing a profile includes providing information pertaining to the presence of non-particulate components, including the presence of non-volatile insulating liquid degradation products.

13. The method according to claim 12, wherein the step of providing a profile includes providing information pertaining to the presence of hydrocarbons.

16. The method according to claim 9, wherein the step of assessing reliability, and predicting failure and operating condition includes comparing the profile to a standardized profile.

17. The method according to claim 9, further comprising:

obtaining a sample of insulating liquid from the electrical equipment;

analyzing the insulating liquid for the presence of wear products and breakdown products to determine the profile of wear products and breakdown products.

14. An electrical equipment operating condition determination method comprising:

providing a profile of wear products and breakdown products; and

assessing reliability, and predicting failure and operating condition of the electrical equipment based on evaluation of the profile of wear products and breakdown products,

wherein the step of providing a profile includes providing information pertaining to the presence of non-particulate components, including the presence of non-volatile insulating liquid degradation products, and providing information pertaining to the presence of hydrocarbons, water, nitrates, alkanes, hydroxyls, oxides, sulfates, coking and viscosity.

15. An electrical equipment operating condition determination method comprising:

providing a profile of wear products and breakdown products; and

assessing reliability, and predicting failure and operating condition of the electrical equipment based on evaluation of the profile of wear products and breakdown products,

wherein the step of providing a profile includes providing information pertaining to the particle count, particle count distribution, particle count concentration, particle count composition, particle count shape, coking, oxidation, nitration, sulfate, alkanes, moisture, particle type composition, particle size and particle shape, and providing information pertaining to the presence of non-particulate components, including the presence of non-volatile insulating liquid degradation products.