Method of Diagnosing Oil-Immersed Electrical Apparatus
US-2021033570-A1 · Feb 4, 2021 · US
Temperature estimation method
US11015987B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11015987-B2 |
| Application number | US-201716094760-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 6, 2017 |
| Priority date | Jun 7, 2016 |
| Publication date | May 25, 2021 |
| Grant date | May 25, 2021 |
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Abstract
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A temperature estimation method estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil. The temperature estimation method includes measuring concentrations of two types of thermal decomposition products in the insulating oil and calculating a temperature of the heat generating site in the oil-immersed electric appliance based on a concentration ratio between the two types of thermal decomposition products and a relational expression between the temperature of the heat generating site and the concentration ratio prepared in advance. When the silicone oil is adopted as the insulating oil, at least one of the two types of thermal decomposition products is straight-chain siloxane, alcohol containing silicon, or benzene. When the ester oil is adopted as the insulating oil, the two types of thermal decomposition products are fatty acids.
First claim
Opening claim text (preview).
The invention claimed is: 1. A temperature estimation method of estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil, the temperature estimation method comprising: a measurement step of measuring concentrations of two types of thermal decomposition products in the insulating oil; and a calculation step of calculating a temperature of the heat generating site in the oil-immersed electric appliance based on a concentration ratio between the two types of thermal decomposition products and a relational expression between the temperature of the heat generating site and a reference concentration ratio prepared in advance, at least one of the two types of thermal decomposition products being straight-chain siloxane, alcohol containing silicon, or benzene when the silicone oil is adopted as the insulating oil, and the two types of thermal decomposition products being fatty acids when the ester oil is adopted as the insulating oil. 2. The temperature estimation method according to claim 1 , wherein the concentration ratio is a concentration ratio of branched fatty acid/straight-chain fatty acid, straight-chain fatty acid/branched fatty acid, saturated fatty acid/unsaturated fatty acid, or unsaturated fatty acid/saturated fatty acid when the ester oil is adopted as the insulating oil. 3. The temperature estimation method according to claim 1 , wherein the straight-chain siloxane is hexamethyldisiloxane or octamethyltrisiloxane. 4. The temperature estimation method according to claim 3 , wherein the alcohol containing silicon is trimethylsilanol. 5. The temperature estimation method according to claim 3 , wherein the concentration ratio is a concentration ratio of hexamethylcyclotrisiloxane/trimethylsilanol, benzene/hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane/trimethylsilanol, benzene/octamethylcyclotetrasiloxane, octamethyltrisiloxane/hexamethyldisiloxane, or benzene/trimethylsilanol when the silicone oil is adopted as the insulating oil. 6. The temperature estimation method according to claim 3 , wherein the concentration ratio is a concentration ratio of branched fatty acid/straight-chain fatty acid, straight-chain fatty acid/branched fatty acid, saturated fatty acid/unsaturated fatty acid, or unsaturated fatty acid/saturated fatty acid when the ester oil is adopted as the insulating oil. 7. The temperature estimation method according to claim 1 , wherein the alcohol containing silicon is trimethylsilanol. 8. The temperature estimation method according to claim 7 , wherein the concentration ratio is a concentration ratio of hexamethylcyclotrisiloxane/trimethylsilanol, benzene/hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane/trimethylsilanol, benzene/octamethylcyclotetrasiloxane, octamethyltrisiloxane/hexamethyldisiloxane, or benzene/trimethylsilanol when the silicone oil is adopted as the insulating oil. 9. The temperature estimation method according to claim 7 , wherein the concentration ratio is a concentration ratio of branched fatty acid/straight-chain fatty acid, straight-chain fatly acid/branched fatty acid, saturated fatty acid/unsaturated fatty acid, or unsaturated fatty acid/saturated fatty acid when the ester oil is adopted as the insulating oil. 10. The temperature estimation method according to claim 1 , wherein the concentration ratio is a concentration ratio of hexamethylcyclotrisiloxane/trimethylsilanol, benzene/hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane/trimethylsilanol, benzene/octamethylcyclotetrasiloxane, octamethyltrisiloxane/hexamethyldisiloxane, or benzene/trimethylsilanol when the silicone oil is adopted as the insulating oil. 11. The temperature estimation method according to claim 10 , wherein the concentration ratio is a concentration ratio of branched fatty acid/straight-chain fatty acid, straight-chain fatty acid/branched fatty acid, saturated fatty acid/unsaturated fatty acid, or unsaturated fatty acid/saturated fatty acid when the ester oil is adopted as the insulating oil.
Assignees
Inventors
Classifications
Specific substances contained in the oils or fuels · CPC title
Oils {, i.e. hydrocarbon liquids} (edible oils or edible fats G01N33/03) · CPC title
Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties · CPC title
Gas in oils, e.g. hydrogen in insulating oils · CPC title
using a fluid for insulating purposes only · CPC title
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- What does patent US11015987B2 cover?
- A temperature estimation method estimating a temperature of a heat generating site in an oil-immersed electric appliance immersed in insulating oil, the insulating oil being silicone oil or ester oil. The temperature estimation method includes measuring concentrations of two types of thermal decomposition products in the insulating oil and calculating a temperature of the heat generating site i…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification G01K11/00. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 25 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).