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Analytical calculation method for creepage trace on surface of organic material insulator
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A technology of organic materials and calculation methods, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc.
Active Publication Date: 2016-03-23
STATE GRID CORP OF CHINA +2
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[0005] The technical problem to be solved by the present invention is: Aiming at the problems in the prior art that it is impossible to accurately judge under what circumstances electric tracking and carbon spots will appear on the surface of organic material insulating parts, and how to analyze and calculate electric tracking, a method is proposed. Based on the resistance-capacitanceequivalent circuit model, the method of calculating the leakage tracking and the formation of carbon spots on the surface of organic material insulators is novel in thinking and accurate in judgment.
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example 1
[0030] 1. Data collection.
[0031] The surface resistivity of the collected organic material insulating parts to be calculated in the tracking area μ = 2 × 10 7 , electrode area S 0 =400mm 2 And the length of the tracking area to be calculated is l=1mm, the width d=1mm, and the density of the insulating material ρ=1.75g / cm 3 , Specific heat c=1.25J / g·℃, the area S of the tracking area to be calculated 1 =1mm 2 , ambient temperature T 1 = 20°C.
[0032] 2. Calculation of energy Q (unit J) required for carbonization.
[0033] Using the formula Q=mcΔT, the energy required for trace carbonization Q=4.375×10 -7 J
[0034] 3. The energy Q stored in the capacitor 1 (unit J) calculation, the equivalent resistance-capacitance circuit of the tracking area to be calculated for the constructed organic material insulation is as follows figure 1 shown.
[0035] use the formula Among them, the distribution voltage constant k=6.3245×10 -4 , get the energy Q stored in the capaci...
example 2
[0040] 1. Data collection.
[0041] Collect the surface resistivity of the area to be calculated for tracking μ=5×10 9 , electrode area S 0 =400mm 2 And the length of the area to be calculated for tracking is l=1mm, the width d=1mm, and the density of insulating material ρ=1.75g / cm 3 , Specific heat c=1.25J / g·℃, the area S of the tracking area to be calculated 1 =1mm 2 , ambient temperature T 1 = 20°C.
[0042] 2. Calculation of energy Q (unit J) required for carbonization.
[0043] Using the formula Q=mcΔT, the energy required for trace carbonization Q=4.375×10 -7 J
[0044] 3. The energy Q stored in the capacitor 1 (unit J) calculation.
[0045] use the formula Among them, the distribution voltage constant k=6.3245×10 -4 , get the energy Q stored in the capacitor 1 =9.1232×10 -11 J.
[0047] Using the formula τ 1 = RC calculation time constant, capacitance C = 7.02 × 10 -12 F, the time constant is 3.51×10 -2 S.
[004...
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Abstract
The invention discloses an analytical calculation method for a creepage trace on the surface of an organic material insulator. According to the method, a capacitance and resistance equivalent circuit of a trace area to be calculated in the organic material insulator is constructed, and when the total heat value of the surface of an insulating material is greater than the energy required for carbonization, the insulating material is carbonized according to the energy conservation law. A trace carbonization judgment is made by calculating the energy required for carbonization and the total heat value of the surface. The method is skilful in design, simple and feasible; an accurate and feasible analysis method is provided for judging whether the organic material insulator has trace carbonization or not, and a theoretical basis is provided for preventing creepage trace carbonization of the organic insulator.
Description
technical field [0001] The invention belongs to the field of defect diagnosis of electrical equipment, and relates to an analysis and calculation method for electric leakage tracking on the surface of an organic material insulator. Background technique [0002] With the increasing number of organic insulating components and types of insulating materials used in power grids, the number of insulation accidents caused by organic insulation damage is also increasing. In addition to the design defects and quality problems of the product itself, people's lack of understanding of the scope of application of organic insulating materials leads to improper use, which is also the main cause of accidents. Especially in recent years, with the rapid development of power electronics technology, the use environment of organic insulating materials has also tended to be diversified, not only in ordinary environments, but also in low pressure, outdoor all-weather, coastal salt damage areas, hi...
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