Pre-twisted wire breakage contact resistance experimental measuring method based on thermoelectric conversion

A contact resistance and thermoelectric conversion technology, which is applied in grounding resistance measurement, measurement device, measurement of electrical variables, etc., can solve the problems of voltage measurement equipment interference, inability to obtain AC contact resistance, current and voltage phase difference, etc., to achieve research and analysis errors. small effect

Active Publication Date: 2018-07-31
SOUTH CHINA UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

If this method is implemented in the form of AC, there are two problems as follows. One is that it is necessary to introduce detection equipment and instruments such as oscilloscopes and other impedance angles to obtain the phase difference between the measured current and voltage.
The second is that the alternating current generates a magnetic field in the surrounding space, causing interference to the voltage measuring e

Method used

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  • Pre-twisted wire breakage contact resistance experimental measuring method based on thermoelectric conversion
  • Pre-twisted wire breakage contact resistance experimental measuring method based on thermoelectric conversion
  • Pre-twisted wire breakage contact resistance experimental measuring method based on thermoelectric conversion

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Embodiment

[0041] Such as figure 1 Shown is the structure diagram of the suspension string of the ground wire, including the tower fastener 1, the tower 2, the suspension clamp 3, the pre-twisted wire 4, the pre-twisted wire fracture 5, and the ground wire 6, in order to adjust the internal contact resistance of the pre-twisted wire fracture 5 Accurate measurement, this embodiment uses such as figure 2 Shown a kind of contact resistance experimental measurement method based on the pre-twisted wire fracture of thermoelectric conversion, this method comprises the following steps:

[0042] S1. Accurate thermal parameters are obtained through calculation;

[0043] There are many ways to calculate various thermal parameters (thermal conduction resistance, convection resistance, heat capacity, etc.) in the thermal circuit model, and the most basic method is to calculate directly through the following formula,

[0044] C = mc (1)

[0045] R d = l / (Sλ) (2)

[0046] R e =1 / (Ah c ) (3)

...

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Abstract

The invention discloses a pre-twisted wire breakage contact resistance experimental measuring method based on thermoelectric conversion. The method comprises the following steps: obtaining an accuratethermal parameter by calculation; according to the thermoelectric analogy theory and the temperature heat balance principle, establishing a heat circuit model for a ground wire and the pre-twisted wire fracture; designing a temperature rise experiment to obtain the temperature distribution of discrete points in the axial direction of the ground wire and the pre-twisted wire fracture; according tothe established heat circuit model and the temperature distribution of discrete points obtained by the temperature rise experiment, calculating the contact resistance of the ground wire and the interior of the pre-twisted wire fracture. The method of the invention obtains the AC contact resistance, can effectively avoid the magnetic field interference encountered by an electrical measurement method, only needs to detect the temperature distribution of discrete points of the overall structure, does not need to detect the impedance angle for the detection of AC resistance, requires less apparatus, facilitates online monitoring, and has significance of universal promotion and use.

Description

technical field [0001] The invention relates to the technical field of ground wire measurement, in particular to an experimental measurement method for contact resistance at a fracture of a pre-twisted wire based on thermoelectric conversion. Background technique [0002] The occurrence of disconnection accidents due to overheating of the ground wire often leads to power outages in large areas of the power grid, and even leads to secondary disasters, seriously affecting the safe and stable operation of the power grid and personal safety. Existing studies have shown that the ground wire suspension string (structure such as figure 1 As shown) the inside of the pre-twisted wire fracture is a major heating "bottleneck" point, and the contact resistance is an important factor leading to the disconnection of the ground wire. Therefore, the accurate measurement of the internal contact resistance of the pre-twisted wire fracture is an important basis for studying and analyzing its ...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R27/20
Inventor 刘刚郭德明杨悦荣
Owner SOUTH CHINA UNIV OF TECH
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