CN111473885A - Method for monitoring overheating of electric contact part - Google Patents
Method for monitoring overheating of electric contact part Download PDFInfo
- Publication number
- CN111473885A CN111473885A CN202010283494.4A CN202010283494A CN111473885A CN 111473885 A CN111473885 A CN 111473885A CN 202010283494 A CN202010283494 A CN 202010283494A CN 111473885 A CN111473885 A CN 111473885A
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- China
- Prior art keywords
- electric contact
- contact part
- temperature
- characteristic gas
- overheating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/003—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using absorption or generation of gas, e.g. hydrogen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0047—Specially adapted to detect a particular component for organic compounds
Abstract
The present disclosure discloses a method of monitoring overheating of an electrical contact, comprising: determining the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part; detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part; and judging the temperature of the electric contact part according to the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part. The temperature of the electric contact part is determined by detecting the characteristic gas components, so that non-contact and real-time online monitoring can be realized.
Description
Technical Field
The disclosure belongs to the technical field of power equipment, and particularly relates to a method for monitoring overheating of an electric contact part.
Background
China's power system is continuously developing towards high voltage, long distance, large capacity and the like, however, the problem of overheating of electric contact parts of electrical equipment is aggravated by continuously improved voltage level and transmission capacity, and the safe and stable operation of the power system is seriously damaged. At present, the monitoring of the overheating of the electric contact part of the electric equipment at home and abroad is mainly realized by temperature measurement, which comprises the following steps: a temperature measuring sheet thermometry, an infrared thermometry, an optical fiber thermometry, and a surface acoustic wave wireless thermometry. The thermometric method of the thermometric sheet needs manual timing check, and online monitoring is difficult to realize; the infrared temperature measurement method is easy to be shielded and difficult to reflect the real temperature of the electric contact part; the optical fiber thermometry and the surface acoustic wave wireless thermometry are costly and difficult to achieve non-contact thermometry.
At a microscopic level, the electrical contact of the electrical equipment is a point contact between conductors, the effective contact area of the electrical contact is small, so the contact resistance of the electrical contact is large, and the heat generated by the contact resistance during the power-on operation further increases the contact resistance, so that more heat is generated, the electrical contact is involved in vicious circle, and finally, the overheating of the electrical contact part of the electrical equipment is caused. In order to reduce the contact resistance of the electrical contact and to improve the current capacity, it is necessary to apply a conductive paste (electrical compound grease) to the electrical contact portion during mounting. The reasonable use of the conductive paste can effectively improve the overheating condition of the electric contact part, but due to process defects, irregular installation or sudden increase of load and the like, the overheating of the electric contact part still occurs sometimes. In the overheating process, the base oil or the additive in the electric composite grease can be decomposed to a certain degree due to thermal stress to generate gases with rich varieties, and the gases contain a large amount of characteristic information, so that a new thought is provided for monitoring the overheating of the electric contact part.
Disclosure of Invention
In view of the deficiencies in the prior art, the present disclosure provides a method for monitoring overheating of an electrical contact portion, which monitors a temperature of the electrical contact portion by detecting characteristic gases corresponding to different temperatures when the electrical contact portion is overheated.
In order to achieve the above purpose, the present disclosure provides the following technical solutions:
A method of monitoring the temperature of an electrical contact site comprising the steps of:
S100: determining the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
S200: detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
S300: and judging the temperature of the electric contact part according to the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
Preferably, the correspondence between the overheating of the electrical contact portion and the characteristic gas components generated by the thermal decomposition of the conductive paste applied to the electrical contact portion includes:
When the temperature of the electric contact part is more than or equal to 140 ℃, the characteristic gas comprises 2-octanone or heptadecane;
When the temperature of the electric contact part is more than or equal to 160 ℃, the characteristic gas comprises hexanal and undecane;
When the temperature of the electric contact part is more than or equal to 180 ℃, the characteristic gas comprises octanal and dodecane;
When the temperature of the electric contact part is more than or equal to 200 ℃, the characteristic gas comprises 2-nonanone and p-xylene.
Preferably, when any one of 2-octanone and heptadecane is detected, the temperature of the electric contact site is determined to be 140 ℃ or higher.
Preferably, when hexanal and undecane are detected simultaneously, the temperature of the electric contact site is judged to be 160 ℃ or higher.
Preferably, when octanal and dodecane are detected simultaneously, the temperature of the electric contact portion is judged to be 180 ℃ or higher.
Preferably, when 2-nonanone and p-xylene are detected simultaneously, the temperature of the electric contact portion is judged to be 200 ℃ or higher.
The present disclosure also provides a device for monitoring the temperature of an electrical contact site, comprising:
The detection unit is used for detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
The storage unit is used for storing data recording the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
And the judging unit is used for judging the temperature of the electric contact part according to the data of the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
Preferably, the detection unit includes a gas sensor.
Preferably, the storage unit includes a memory.
Preferably, the determination unit includes an arithmetic unit.
Compared with the prior art, the beneficial effect that this disclosure brought does: the non-contact on-line detection is easy to realize, and the real temperature of the electric contact part can be scientifically reflected through the characteristic gas detection.
Drawings
Fig. 1 is a flowchart of a method for monitoring a temperature of an electrical contact according to an embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to fig. 1. While specific embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present disclosure is to be determined by the terms of the appended claims.
To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present disclosure.
In one embodiment, as shown in FIG. 1, a method of monitoring overheating of an electrical contact comprising the steps of:
S100: determining the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
S200: detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
S300: and judging the temperature of the electric contact part according to the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
In the embodiment, the components of the characteristic gas generated by the thermal decomposition of the conductive paste are detected, so that the temperature of the electric contact part can be monitored in real time in a non-contact manner on line.
In another embodiment, the correspondence between the overheating of the electrical contact and the characteristic gas components generated by the thermal decomposition of the conductive paste applied to the electrical contact includes:
When the temperature of the electric contact part is more than or equal to 140 ℃, the characteristic gas comprises 2-octanone or heptadecane;
When the temperature of the electric contact position is more than or equal to 160 ℃, the characteristic gas comprises hexanal and undecane;
When the temperature of the electric contact part is more than or equal to 180 ℃, the characteristic gas comprises octanal and dodecane;
When the temperature of the electric contact position is more than or equal to 200 ℃, the characteristic gas comprises 2-nonanone and p-xylene.
In this embodiment, experimental studies have found that when the temperature difference is greater than 20 ℃, the characteristic gas generated at different temperatures has a better discrimination, and when the electrical contact temperature is less than 140 ℃, the characteristic gas discrimination is poorer, and further, according to the current standard, the maximum tolerance temperature of the conductive paste is 200 ℃, based on the above three considerations, the temperature detection range is set to 140 ℃ to 200 ℃, the temperature difference level is set to four levels, and the temperature difference at each level is 20 ℃.
In another example, when any one of 2-octanone and heptadecane is detected, the temperature of the electric contact site is judged to be 140 ℃ or higher.
In this embodiment, when the overheating temperature of the electrical contact portion is lower than 140 ℃, the characteristic gas generated by the thermal decomposition of the conductive paste does not contain 2-octanone or heptadecane, and when the overheating temperature of the electrical contact portion is higher than or equal to 140 ℃, the characteristic gas generated by the thermal decomposition of the conductive paste contains 2-octanone or heptadecane, so that if the characteristic gas generated by the thermal decomposition of the conductive paste contains 2-octanone or heptadecane, it can be determined that the overheating temperature of the electrical contact portion is higher than or equal to 140 ℃.
In another embodiment, if hexanal and undecane are detected simultaneously, the temperature of the electric contact site is judged to be 160 ℃ or higher.
In this embodiment, if the overheating temperature of the electrical contact portion is lower than 160 ℃, hexanal and undecane do not simultaneously appear in the characteristic gas generated by the thermal decomposition of the conductive paste, and if the overheating temperature of the electrical contact portion is higher than or equal to 160 ℃, hexanal and undecane simultaneously appear in the characteristic gas, so that if it is detected that the characteristic gas generated by the thermal decomposition of the conductive paste simultaneously contains hexanal and undecane, it can be determined that the overheating temperature of the electrical contact portion is higher than or equal to 160 ℃.
In another embodiment, if octanal and dodecane are detected simultaneously, the temperature of the electrical contact site is determined to be 180 ℃ or higher.
In this embodiment, if the overheating temperature of the electrical contact portion is lower than 180 ℃, octanal and dodecane do not simultaneously appear in the characteristic gas generated by thermal decomposition of the conductive paste, and if the overheating temperature of the electrical contact portion is higher than or equal to 180 ℃, octanal and dodecane simultaneously appear in the characteristic gas, so that if it is detected that the characteristic gas generated by thermal decomposition of the conductive paste simultaneously contains octanal and dodecane, it can be determined that the overheating temperature of the electrical contact portion is higher than or equal to 180 ℃.
In another example, if 2-nonanone and p-xylene are detected simultaneously, the temperature of the electrical contact site is judged to be 200 ℃ or higher.
In this embodiment, if the overheating temperature of the electrical contact portion is lower than 200 ℃, 2-nonanone and p-xylene may not be simultaneously present in the characteristic gas generated by thermal decomposition of the conductive paste, and if the overheating temperature of the electrical contact portion is not lower than 200 ℃, 2-nonanone and p-xylene may be simultaneously present in the characteristic gas, so that if it is detected that the characteristic gas generated by thermal decomposition of the conductive paste simultaneously contains 2-nonanone and p-xylene, it can be determined that the overheating temperature of the electrical contact portion is not lower than 200 ℃.
In another embodiment, the present disclosure also provides a device for monitoring overheating of an electrical contact, comprising:
The detection unit is used for detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
The storage unit is used for storing data recording the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
And the judging unit is used for judging the temperature of the electric contact part according to the data of the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
In another embodiment, the detection unit comprises a gas sensor.
In another embodiment, the storage unit includes a memory.
In another embodiment, the determining unit includes an operator.
The above description of the embodiments is only intended to facilitate the understanding of the present disclosure and its core ideas. It should be noted that, for those skilled in the art, without departing from the principle of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall into the protection scope of the claims of the present disclosure.
Claims (10)
1. A method of monitoring overheating of an electrical contact, comprising the steps of:
S100: determining the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
S200: detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
S300: and judging the temperature of the electric contact part according to the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
2. The method according to claim 1, wherein the correspondence between the overheating of the electrical contact site and the characteristic gas components generated by the thermal decomposition of the conductive paste applied to the electrical contact site preferably comprises:
When the temperature of the electric contact part is more than or equal to 140 ℃, the characteristic gas comprises 2-octanone or heptadecane;
When the temperature of the electric contact position is more than or equal to 160 ℃, the characteristic gas comprises hexanal and undecane;
When the temperature of the electric contact part is more than or equal to 180 ℃, the characteristic gas comprises octanal and dodecane;
When the temperature of the electric contact position is more than or equal to 200 ℃, the characteristic gas comprises 2-nonanone and p-xylene.
3. The method according to claim 2, wherein the temperature of the electric contact site is determined to be 140 ℃ or higher when any one of 2-octanone and heptadecane is detected.
4. The method according to claim 2, wherein the temperature of the electric contact site is judged to be 160 ℃ or higher if hexanal and undecane are simultaneously detected.
5. The method of claim 2, wherein if octanal and dodecane are simultaneously detected, the temperature of the electrical contact site is judged to be 180 ℃ or higher.
6. The method according to claim 2, wherein the temperature of the electric contact portion is judged to be 200 ℃ or higher if 2-nonanone and p-xylene are simultaneously detected.
7. A monitoring device employing the method of any one of claims 1-6, comprising:
The detection unit is used for detecting characteristic gas generated by thermal decomposition of the conductive paste coated on the electric contact part;
The storage unit is used for storing data recording the corresponding relation between the overheating of the electric contact part and the characteristic gas components generated by the thermal decomposition of the conductive paste coated on the electric contact part;
And the judging unit is used for judging the temperature of the electric contact part according to the data of the corresponding relation between the overheating of the electric contact part and the characteristic gas component generated by the thermal decomposition of the conductive paste coated on the electric contact part.
8. The apparatus of claim 7, wherein the detection unit comprises a gas sensor.
9. The apparatus of claim 7, wherein the storage unit comprises a memory.
10. The apparatus of claim 7, wherein the determination unit comprises an operator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010283494.4A CN111473885A (en) | 2020-04-10 | 2020-04-10 | Method for monitoring overheating of electric contact part |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010283494.4A CN111473885A (en) | 2020-04-10 | 2020-04-10 | Method for monitoring overheating of electric contact part |
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| CN111473885A true CN111473885A (en) | 2020-07-31 |
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| CN202010283494.4A Pending CN111473885A (en) | 2020-04-10 | 2020-04-10 | Method for monitoring overheating of electric contact part |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2825272A1 (en) * | 1977-06-15 | 1979-01-04 | Gen Electric | Heat decomposing coating compsn. contg. resin - and poly:halogenated cpd. detectable by gas chromatography, for detecting overheating in electrical appts |
| CN1487400A (en) * | 2002-08-26 | 2004-04-07 | ������������ʽ���� | Complex function device, producing method thereof , touch information system and information inputting device |
| CN109186786A (en) * | 2018-10-10 | 2019-01-11 | 西安交通大学 | Whether a kind of monitoring electrical equipment is in electrical contact the devices and methods therefor of overheat |
-
2020
- 2020-04-10 CN CN202010283494.4A patent/CN111473885A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2825272A1 (en) * | 1977-06-15 | 1979-01-04 | Gen Electric | Heat decomposing coating compsn. contg. resin - and poly:halogenated cpd. detectable by gas chromatography, for detecting overheating in electrical appts |
| CN1487400A (en) * | 2002-08-26 | 2004-04-07 | ������������ʽ���� | Complex function device, producing method thereof , touch information system and information inputting device |
| CN109186786A (en) * | 2018-10-10 | 2019-01-11 | 西安交通大学 | Whether a kind of monitoring electrical equipment is in electrical contact the devices and methods therefor of overheat |
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Application publication date: 20200731 |