A Method for Measuring the Natural Convection Temperature Field of Overhead Transmission Lines

Abstract

The invention discloses a method for measuring the natural convection temperature field of an overhead power transmission line by adopting a wheel-shaped thermocouple cluster driven by a stepping motor to drive a split bearing and fixing it. It mainly includes the following steps: S1. Even clusters are evenly fixed on split bearings driven by stepper motors. The distance between the temperature measuring contact of each thermocouple and the wire is different, and it is used to measure the temperature of the thermal field at different distances from the wire. S2. After splitting the outer ring of the bearing and rotating around the wire at a certain period, the temperature distribution at a specified position and a specified distance around the wire can be obtained. The present invention comprehensively considers the temperature field distribution of electric power overhead lines, measurement technology and engineering thermophysics, and can not affect the original temperature distribution as much as possible under the premise of relatively accurate measurement of the temperature field distribution around the overhead line .

Description

technical field [0001] The invention relates to the temperature measurement technology of thermocouples, the principle of motor driving, overhead transmission line technology and technical fields related to engineering thermophysics, in particular to a wheel-shaped thermocouple cluster measurement driven by a stepping motor and fixed by split bearings Method for natural convection temperature field of overhead transmission lines. Background technique [0002] General overhead transmission lines should satisfy the heat balance equation of the following form: [0003] Q R +Q t =Q l +Q f (1) [0004] Among them, Q R Represents the Joule heat generated by the conductor per unit length, Q t Represents the solar radiation heat received by the conductor per unit length, Q l Represents the convective heat dissipation per unit length of the problem, Q f Represents the radiative heat dissipation of a conductor per unit length. [0005] Since the Joule heat formula of a cond...

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Problems solved by technology

In the actual operation of overhead lines, especially considering the operation of double-split conductors without spacers, the temperature influence between the conductors is a very important research topic, and the actual operating conductors are very sensitive due to their environment. The temperature field obtained through theoretical calculations often cannot meet the requirements. Therefore, it is necessary to conduct experimental research on the near-temperature field distribution of wires. At present, it is urgent to provide a feasible and convenient monitoring method for the near-temperature field monitoring of overhead lines. method

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