A test method and test device for the maximum carrying capacity of a strain clamp operating online
A technology of maximum current-carrying capacity and tension clamp, applied in the direction of measuring device, measurement of electricity, measurement of electric variables, etc., can solve the problems of lack of wire clamp, complicated calculation, and difficulty in accurately obtaining current-carrying capacity.
Active Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
The traditional heat balance method needs to consider too many factors, and the calculation is quite cumbersome, which is not conducive to staff inspection, maintenance, etc.
Moreover, the shape of the strain clamp is irregular, and the calculation of the heat balance method will cause a large error
There are other methods such as simulated thermonuclear method, finite element method, finite difference method, etc. Due to the lack of online operation parameters of the clamp (such as clamp resistance), it is difficult to accurately obtain the maximum allowable current carrying capacity of the strain clamp for online operation
Method used
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Embodiment 1
[0053] Such as figure 1 As shown, in this embodiment, a test device for the maximum carrying capacity of the tension clamp on line includes an infrared thermometer, a multimeter and a computer, and the infrared thermometer is used to measure the temperature of each temperature measuring point on the surface of the tension clamp. temperature, the ambient temperature around the tension clamp, the multimeter is used to measure the voltage at both ends of the tension clamp; the infrared thermometer and the multimeter are respectively connected to the computer, and the computer is used to calculate the current online operation The maximum current carrying capacity allowed by the tension clamp. The computer is connected to the dispatching center of the power supply bureau, and sends the maximum ampacity allowed by the strain clamp to the dispatching center of the power supply bureau, and the dispatching center of the power supply bureau controls the current passing through the high-...
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The invention discloses a test method and a test device for the maximum carrying capacity of a strain-resistant clamp running on-line. Flow; establish a thermal circuit model, calculate the resistance value of each aluminum thermal resistance and air thermal resistance in the thermal circuit model, and then obtain the heating power conducted by each aluminum thermal resistance and the heating power dissipated by each air thermal resistance , and then calculate the operating resistance of each part of the strain clamp during online operation according to the ampacity, the heat conduction power, and the dissipated heat power; In the case of the temperature of each temperature measuring point, the maximum allowable current carrying capacity of the tension clamp is calculated with the constraints of the overhead wire not exceeding 70°C and the strain clamp not exceeding 80°C. The invention has the advantages of simple operation and accurate measurement.
Description
technical field [0001] The invention relates to the field of strain clamp research, in particular to a testing method and a testing device for the maximum carrying capacity of a strain clamp running online. Background technique [0002] The maximum current carrying capacity of traditional strain clamps is derived from the heat balance method of heat generation and heat dissipation. This method is greatly affected by the environment and needs to measure a lot of data, such as ambient temperature, wind speed, sunlight intensity, surface altitude, etc., and the corresponding air heat transfer coefficient and dynamic viscosity should be found out according to the ambient temperature at that time. The traditional heat balance method needs to consider too many factors, and the calculation is quite cumbersome, which is not conducive to staff inspection and maintenance. Moreover, the shape of the tension clamp is irregular, and the calculation using the heat balance method will cau...
Claims
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IPC IPC(8): G01R31/00G01R27/02
Inventor 刘刚黎李广
Owner SOUTH CHINA UNIV OF TECH