Device and method for measuring overhead stranded wire resistance temperature coefficient

Abstract

The invention provides a device and method for measuring an overhead stranded wire resistance temperature coefficient. The device comprises a box body, wherein a cavity used for containing engine oil is formed in the box body, the oil level of the engine oil is located on the middle upper portion of the cavity, the cavity is connected with a circulating pump through a circulating pipeline, a clamping device is arranged in the middle portion of the inner wall of the cavity oppositely, an end of the clamping device is sequentially connected with an insulator, a corrugated pipe, a digital tension meter and a loading rocking handle in the same axial direction, the corrugated pipe and the loading rocking handle are connected with the box body in a threaded mode, a heater and a temperature sensor are arranged at the bottom of the cavity, the temperature sensor is connected with the heater through a temperature controller, the device controls the temperature of a wire through oil bath, and therefore the stranded wire resistance temperature coefficient can be accurately measured.

Description

technical field [0001] The invention relates to a device for measuring the temperature coefficient of resistance of an overhead strand and a measuring method thereof, in particular to a device for measuring the temperature coefficient of resistance of an overhead strand controlled by an oil bath and a measuring method thereof. Background technique [0002] The determination of the temperature coefficient of resistance of the overhead stranded wire is obtained by measuring the DC resistance of the same stranded wire at different temperatures, and then performing linear fitting on the different temperatures and the obtained DC resistance. In the current measurement method, changing the temperature of the stranded wire is mainly to use the heat generated by the current applied to the stranded wire to increase the temperature of the wire. On the basis of this temperature, the DC resistance of the overhead stranded wire is measured. For example, the application number is 200880116...

AI Technical Summary

Problems solved by technology

In the current measurement method, changing the temperature of the stranded wire is mainly to use the heat generated by the current applied to the stranded wire to increase the temperature of the wire. On the basis of this temperature, the DC resistance of the overhead stranded wire is measured. For example, the application number is 200880116536.2. The patent name is "wire Protection method and wire protection device", the method includes the steps of: detecting the applied current of the load every predetermined time; using the detected applied current to calculate the temperature change in the wire every predetermined time; estimating the The temperature of the wire; in this method, because the wire is exposed to the air, under the influence of external temperature and air convection, the heat required for the wire to rise to a certain temperature is difficult to be accurately controlled. After the wire is heated, the inner and outer layers of the stranded wire often appear There is a phenomenon of temperature difference, which seriously affects the accuracy of the measured temperature coefficient of resistance of the stranded wire

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