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
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
CN108344898AActive Publication Date: 2018-07-31SOUTH CHINA UNIV OF TECH
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[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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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 ...
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Patent Timeline
31 Jul 2018
Publication
CN108344898A
- IPC
- G01R27/02; G01R27/20
- Inventors
- 刘刚; 郭德明