Tool and method for simulating internal heating of composite insulator
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A composite insulator and internal heating technology, which is applied in microwave heating, electric heating devices, electric/magnetic/electromagnetic heating, etc., can solve the problems of local heating of insulators, reappearing thermal aging process of insulators, mechanism obstacles of rotten fracture, etc.
Pending Publication Date: 2021-03-02
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology
The existing laboratory heating methods are difficult to simulate the heating at the interface. The traditional method is to heat the insulator (including the insulating sheath), and the heat transfer gradually develops from the surface of the sheath to the inside, or to heat the mandrel, no longer considering the insulation Influenced by
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[0018]Example 1
[0019]According to the propagation law of electromagnetic waves in the medium, the process of transmission, scattering and reflection of microwaves occurs when they are perpendicularly incident on the medium. In the passive region of free space, the wave equation of the electromagnetic field can be changed to a homogeneous Helmholtz vector equation:
[0020]
[0021]Among them, k0 is the free space wave number, E is the electric field component of a uniform plane electromagnetic wave,
[0022]
[0023]For the components Ex, Ey, and Ez of the three directions of the vector E in the rectangular coordinate system, all satisfy equation (1). For a uniform plane wave propagating in the +z direction, the phasor expression of electric field strength is:
[0024]
[0025]Where E0It is a constant vector.
[0026]The propagation characteristics of electromagnetic waves in dielectrics are analyzed separately below. In order to facilitate the discussion of the propagation law of electromagnetic waves,...
Example Embodiment
[0061]Example 2
[0062]Two samples containing interfacial defects were taken from the composite insulators with high temperature and heat on site and named 1# and 2# respectively, and the length was about 200mm. The sample is heat-treated with microwave, and the microwave power and processing time acting on the insulator are changed by adjusting the working gear and working time of the microwave oven. After the test, the highest temperature of the surface of the insulator sample is recorded. The control microwave output power is 400W, 800W, 1200W, 1600W, 2000W, and the microwave action time is 10s, 20s, 30s, 40s, 50s, and 60s. Normal insulator samples and samples with interface defects 1#, 2 under different influencing factors #Use the infrared camera to observe the fever such asfigure 2 image 3 Shown.
[0063]With the increase of microwave power and heating time, the surface temperature of short samples with defective insulators rises faster, and the surface temperature of normal insula...
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Abstract
In order to simulate the heating phenomenon of a composite insulator on site as much as possible and further research the influence of high temperature on the rotten fracture of the composite insulator, the invention provides a mechanism of causing the rotten fracture of the composite insulator by high temperature so as to find effective measures for preventing the rotten fracture of the compositeinsulator. The invention provides a tool and method for simulating the internal heating of a composite insulator, and the tool comprises a silicone rubber sheath at the outer layer and a glass fiberreinforced plastic cylindrical core rod wrapped by the sheath, a tiny simulated defect is placed at the critical part of the sheath and the core rod, and the tiny simulated defect, the sheath and thecore rod form the composite insulator with the defect. A semi-ellipsoidal air gap is formed between the simulated defect and the sheath, and the length of the simulated defect is far less than that ofthe core rod; wherein the simulated defect is a high dielectric loss or conductive material, and the sheath and the core rod are made of an insulating material; and microwave heating is carried out on the simulated composite insulator sample to obtain a simulated sample of composite insulator rotting fracture caused by high temperature.
Description
technical field [0001] The invention relates to the field of power system safety, and more specifically relates to an appliance and a method for simulating internal heating of a composite insulator. Background technique [0002] Composite insulators are widely used because of their excellent hydrophobic properties, light weight, and convenient transportation and installation, which play a role in protecting power systems and equipment. However, in recent years, composite insulators in operation have experienced abnormal fracture phenomena such as decay and fracture, which has caused extremely severe power grid safety accidents. Through on-site investigation, it was found that the composite insulators with decayed fractures have the following characteristics: 1) The mandrel is severely deteriorated (the macroscopic section of the mandrel is not smooth, the texture of the mandrel becomes crisp, and the shape is like decayed wood, the mandrel is pulverized, the glass fiber and ...
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