On-line bridge measurement system for temperature rise of outlet end of vacuum switch
A vacuum switch and measurement system technology, applied in the direction of measuring devices, measuring heat, and thermometers that give differential values, can solve the problems of lack of accuracy and stability data, potential isolation of temperature sensing elements, and electromagnetic interference in infrared methods, and achieve Industrial realization of convenience, reliable operation and long service life
Inactive Publication Date: 2011-09-14
DALIAN UNIV OF TECH
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Problems solved by technology
There are potential isolation and electromagnetic interference problems in the temperature sensing element for direct measurement, while the infrared method lacks long-term operation accuracy stability data
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[0015] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.
[0016] When the system current flows from the upper outlet flange 1, the vacuum interrupter 2, the movable electrical contact part 3 to the lower outlet flange 4, the movable electrical contact part 3 with contact resistance is heated by the thermal effect of the current, and its temperature is heated by the epoxy The difference between the temperature measured by the temperature sensing element 7 of the electrical contact part installed on the insulating cylinder and the electrical contact support 5 , and the temperature measured by the environmental temperature sensing element 8 on the metal mounting frame 6 of the switch is the temperature rise of the outlet end of the vacuum switch. The installation position of the temperature sensing element 7 at the electrical contact part is as close as possible to the movable electri...
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The invention relates to an on-line bridge measurement system for temperature rise of an outlet end of a vacuum switch, and belongs to the technical field of power high voltage switches. The system is characterized in that when a movable electric contact part with contact resistance is heated by current heat effect, the temperature is measured by an electric contact part temperature sensing element arranged on an epoxy insulating cylinder and an electric contact support; the difference between the measured temperature and the temperature measured by an environmental temperature sensing element on a switch metal mounting frame is the temperature rise of the outlet end of the vacuum switch; the installation position of the electric contact part temperature sensing element is as much close to the movable electric contact part with the contact resistance as possible on the premise of ensuring the insulation of the installation position of the electric contact part temperature sensing element; and a temperature rise signal can be directly acquired by forming the electric contact part temperature sensing element and the environmental temperature sensing element into a bridge structure. By using a conventional temperature sensing element, the potential insulation can be performed by using a conventional insulating layer, the temperature rise signal can be directly acquired by using differential output of double temperature measurement elements, the electromagnetic interference can be more easily overcome, and the on-line temperature measurement for the temperature rise of the electric contact part can be realized according to the data such as the actually measured thermal resistance of the material, parameters of the temperature sensing elements and the like.
Description
technical field [0001] The invention belongs to the technical field of electric high-voltage switches, and relates to a practical on-line measurement technology of vacuum switch temperature rise, which is used for measuring the temperature rise of high-voltage vacuum switch outlet terminals due to the large thermal resistance of movable electrical contact parts. Background technique [0002] The high-voltage vacuum switch in the power system is an important device to ensure the safe operation of the system. The temperature rise of the movable electrical contact part of the vacuum switch's moving conductive rod is one of the important measurement parameters, which determines the working state under the rated current. On-line measurement of vacuum switch temperature rise in operation is necessary to realize its intelligence. Commonly used temperature measurement methods have certain application limitations for active electrical contact parts in normal operation. There are pot...
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IPC IPC(8): G01K7/20G01K3/08
Inventor 邹积岩段雄英廖敏夫王永兴董恩源丛吉远
Owner DALIAN UNIV OF TECH