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Method for suppressing copper sulfide generation in oil-filled electrical equipment
US9396835B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9396835-B2 |
| Application number | US-201114349360-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 30, 2011 |
| Priority date | Nov 30, 2011 |
| Publication date | Jul 19, 2016 |
| Grant date | Jul 19, 2016 |
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- Title
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Abstract
Official abstract text for this publication.
The present invention is a method for preventing copper sulfide generation in oil-filled electrical equipment having an inhibitor of copper sulfide generation in insulating oil, and the method is characterized in monitoring characteristics of the insulating oil and performing re-addition of the inhibitor at an appropriate moment in accordance with a result of the monitoring.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for suppressing copper sulfide generation in oil-filled electrical equipment having an inhibitor of copper sulfide generation in insulating oil, the method comprising: monitoring an amount of copper in said insulating oil and performing re-addition of said inhibitor in response to detecting copper having a concentration of 0.1 ppm or greater in said insulating oil, or in response to detecting that said amount of copper in said insulating oil begins to increase from a flat state, or ends a tendency of reduction and turns into a tendency of remaining flat or increasing, in accordance with a result of said monitoring. 2. The method for suppressing copper sulfide generation according to claim 1 , wherein said insulating oil contains a causative substance causing copper sulfide generation or exhibits corrosiveness in an IEC62535 sulfidation corrosion test. 3. The method for suppressing copper sulfide generation according to claim 2 , wherein said causative substance is dibenzyldisulfide. 4. The method for suppressing copper sulfide generation according to claim 1 , wherein an amount of said inhibitor in said insulating oil is monitored during said monitoring, and said inhibitor is re-added prior to depletion of said inhibitor. 5. The method for suppressing copper sulfide generation according to claim 4 , wherein said inhibitor is added in response to detecting a concentration of said inhibitor in said insulating oil is a predetermined threshold value or less. 6. The method for suppressing copper sulfide generation according to claim 1 , wherein said insulating oil contains an oxidative degradation preventing agent.
Assignees
Inventors
Classifications
Sulfur containing · CPC title
Metal particles · CPC title
Oil cooling · CPC title
Condition responsive control · CPC title
- H01B3/20Primary
liquids, e.g. oils (silicone oils H01B3/46) · CPC title
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Frequently asked questions
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- What does patent US9396835B2 cover?
- The present invention is a method for preventing copper sulfide generation in oil-filled electrical equipment having an inhibitor of copper sulfide generation in insulating oil, and the method is characterized in monitoring characteristics of the insulating oil and performing re-addition of the inhibitor at an appropriate moment in accordance with a result of the monitoring.
- Who is the assignee on this patent?
- Kato Fukutaro, Nagao Eiichi, Amimoto Tsuyoshi, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification H01B3/20. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 19 2016 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).