Method for judging metal corrosion state of power transformer and its supporting structure
A technology for power transformers and supporting structures, applied in weather resistance/light resistance/corrosion resistance, instruments, scientific instruments, etc., can solve the problems of low test conditions, low cost, low efficiency, etc., and achieve the effect of corrosion degree convenient and fast
Active Publication Date: 2022-08-09
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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Problems solved by technology
[0005] The purpose of the present invention is to provide a method for judging the metal corrosion state of a power transformer and its supporting structure, which solves the problems of high artificial strength and low efficiency of the classic metal corrosion state method, and the test conditions are lower than the non-destructive testing method and the cost is low, which can be applied to On-site inspection
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[0040] like Figure 1-Figure 6 As shown in the figure, the method for judging the metal corrosion state of a power transformer and its supporting structure includes the following steps:
[0041] S1: Standard samples of materials used for corrosion of power transformers and their supporting structures by the salt spray method. Standard samples include carbon steel and galvanized steel; specifically:
[0042] The metal materials of the power transformer to be tested and its frame, carbon steel and galvanized steel, are cut into standard samples with a size of 150mm×100mm×5mm. The salt spray method (GB / T 2423.17) was used to simulate a high temperature and high humidity environment, the solution temperature was controlled at 35°C, and the test chamber temperature was controlled at 47°C (±0.5°C). with NaHSO 3 and NaCl as the corrosion medium to configure the corrosion solution, the concentrations are 12.5g / L and 50g / L respectively, and the spray volume is controlled at 1~2ml / 80c...
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The invention discloses a method for judging the metal corrosion state of a power transformer and its supporting structure. The invention firstly conducts an atmospheric corrosion test on the metal material of the power transformer and its supporting structure based on the environmental conditions of industrial polluted atmosphere, so as to make the corrosion electrochemical characteristic database It is more in line with the corrosion characteristics in harsh environments, which is conducive to the corrosion assessment of power transformers with severe corrosion; then this paper uses a portable electrochemical workstation and electrodes to conduct electrochemical tests of metals, and finally extracts the electrochemical tests under different corrosion degrees. Corrosion evaluation was carried out using characteristic quantities. This method determines the electrochemical transfer resistance R t The corresponding relationship with the metal corrosion degree interval realizes the convenient and fast measurement of the corrosion degree of the metal material of the power transformer, which is suitable for the actual engineering site.
Description
technical field [0001] The invention relates to the technical field of metal corrosion state detection, in particular to a method for judging metal corrosion state of a power transformer and its supporting structure. Background technique [0002] Substation power transformers include Potential Transformer (PT) and Current Transformer (CT), which are used by substations to supply power to measuring instruments and relay protection devices, and measure the voltage, current, power and electrical equipment. The primary side of the high-voltage end is directly connected in series with the line where the voltage or current needs to be measured, and the secondary side of the low-voltage end is connected in series with the measuring instrument and the protection circuit. Generally, the low-voltage side is mounted on a carbon steel or galvanized steel metal frame by means of fasteners. [0003] Because most of the substations are in an outdoor open-air environment, the climatic con...
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IPC IPC(8): G01N17/02G01N5/04
CPCG01N17/006G01N17/02G01N5/04
Inventor 艾兵严平刘鹍刘刚胡娟史强黄嘉鹏钟尧郝建叶子阳李金嵩张杰夫曾兰
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST