Device and method for monitoring electrical equipment for electrical contact overheating

Patent metadata

Field	Value
Publication number	US-11099079-B2
Application number	US-201916261022-A
Country	US
Kind code	B2
Filing date	Jan 29, 2019
Priority date	Oct 10, 2018
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

The present disclosure discloses a device for monitoring electrical equipment for electrical contact overheating, which comprises a gas collection device, a gas detection device, a data processing device, a data storage device and a display and early warning device. The present disclosure further discloses a method for monitoring electrical equipment for electrical contact overheating. The present disclosure can provide a basis for the evaluation and early warning of electrical contact overheating of electrical equipment based on the analysis of the thermally decomposed characteristic gases of the electrical joint compound, and has the characteristics of no space limitation, no need for a large number of layout points, high accuracy, simple structure and easy operation.

First claim

The invention claimed is:

1. A device for monitoring electrical equipment for electrical contact overheating, comprising:
a gas collection device used for collecting gas in a space where the electrical equipment is located;
a gas detection device comprising a gas sensor array for different characteristic gases and used for detecting different characteristic gases of the collected gas;
a data storage device used for storing a response threshold of each gas sensor during normal operation of the electrical equipment, a maximum received energy threshold of a conductor material of the electrical equipment, a received energy value of an electrical contact portion of the electrical equipment, and an electrical contact temperature value of the electrical equipment;
a data processing device comprising a preprocessing device and a comparison device, wherein the preprocessing device is used for preprocessing a detection result of the gas detection device, and determining the response value of each gas sensor and the electrical contact temperature value of the electrical equipment according to the preprocessing result; and the comparison device is used for calculating an energy accumulated value received by the electrical contact portion of the electrical equipment according to the response value of each gas sensor, respectively comparing the response value of each gas sensor and the energy accumulated value received by the electrical contact portion of the electrical equipment with the response threshold of each gas sensor stored in the data storage device and the maximum received energy threshold of the conductor material of the electrical equipment, and outputting the comparison result; and
a display and early warning device used for displaying the name of the detected characteristic gas and the possible overheating temperature and giving out necessary early warning information according to the comparison result.

2. The device according to claim 1 , wherein the gas collection device comprises a solenoid valve and a vacuum pump.

3. The device according to claim 1 , wherein the data processing device comprises an analog-to-digital converter and a microprocessor.

4. The device according to claim 1 , wherein the display and early warning device comprises a display with a buzzer.

5. The device according to claim 1 , wherein the device further comprises a gas passage used for transporting the collected gas.

6. The device according to claim 5 , wherein a material for preparing the gas passage comprises any one of the following: polyethylene, polytetrafluoroethylene, polyurethane and silica gel.

7. A method for monitoring electrical equipment for electrical contact overheating by using the device according to claim 1 , comprising the following steps:
S 100 : collecting, by the gas collection device, gas in a space around the electrical equipment;
S 200 : detecting, by the gas detection device, different characteristic gases of the collected gas;
S 300 : preprocessing, by the data processing device, the gas detected by the gas detection device, and determining a response value of each gas sensor and an electrical contact temperature value of the electrical equipment according to the preprocessing result, and calculating an energy accumulated value received by the electrical contact portion of the electrical equipment by using the response value of each gas sensor;
S 400 : respectively comparing the response value of each gas sensor and the energy accumulated value received by the electrical contact portion in the step S 300 with the response threshold of each gas sensor during normal operation of the electrical equipment and the maximum received energy threshold of the conductor material of the electrical equipment stored in the data storage device; and
S 500 : based on the comparison result of the step S 400 , giving out, by the display and early warning device, the corresponding early warning information or overhaul signal.

8. The method according to claim 7 , wherein, in the step S 300 , the calculation formulae for calculating the energy value received by the electrical contact portion of the electrical equipment by using the response value of each gas sensor are as follows:

Q
=

∑

i
=
1

N

⁢

⁢

Q
i

Q
i

=

K
⁢

∫

t

i
⁢

⁢
0

t

i
⁢

⁢
1

⁢

(

Δ
⁢

⁢

n
i

)

α

⁢
d
⁢

⁢
t

⁢

wherein Q is the total energy received by the conductor, N is the number of consecutive gas detections when the response value of each gas sensor exceeds the threshold for the first time until the response value of each gas sensor no longer rises, Q i is the energy value calculated at the time of the i th detection, K is the proportional coefficient, t i0 is the start time of the i th gas detection, t i1 is the finish time of the i th gas detection, Δn i is the increment of the response value of each gas sensor in the i th gas detection process, and α is the weighting coefficient.

9. The method according to claim 7 , wherein in the step S 400 , if the response value of each gas sensor does not exceed the normal threshold, it indicates that the electrical contact of the electrical equipment is not overheated; if the response value of the one or more gas sensors exceeds the normal threshold, it indicates that the electrical contact of the electrical equipment is about to overheat; and if the energy accumulated value calculate

Assignees

• Univ Xi An Jiaotong

Inventors

• Yang Aijun
• Rong Mingzhe
• Wang Xiaohua
• Liu Yang
• Liu Xiong

Classifications

• G01K11/003 Primary

  using absorption or generation of gas, e.g. hydrogen · CPC title

• G01K1/02 Primary

  Means for indicating or recording specially adapted for thermometers · CPC title

• G01K5/28 Primary

  the material being a gas (contained in a hollow body having parts which are deformable or displaceable under the pressure developed by the material G01K5/32) · CPC title

• G08B17/117

  by using a detection device for specific gases, e.g. combustion products, produced by the fire (G08B17/103, G08B17/11 take precedence) · CPC title

• G08B29/145

  of fire detection circuits · CPC title