Method for detecting content of methanol or ethanol in insulation paper of power transformer
A technology for power transformers and detection methods, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of low-molecular-weight alcohol extraction and detection methods for insulating paper, and achieve the effects of easy implementation, accurate detection, and simple steps
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Embodiment 1
[0046] Firstly, the accelerated thermal aging experiment was carried out to simulate the operation of the on-site transformer, so as to obtain the aged insulating paper. The insulating oil used in the experiment is Karamay 25# mineral oil, and the insulating paper used is Taizhou Xinyuan ordinary kraft paper. The method of accelerated heat aging test under laboratory conditions, the steps are as follows:
[0047] (1) Take 30g of insulating paper and 300mL of insulating oil, and dry them in a vacuum oven at 90°C for 48 hours to remove moisture;
[0048] (2) Immerse the insulating paper in insulating oil, and vacuum impregnate at 70°C for 48 hours;
[0049] (3) Put the oil-paper insulation sample composed of insulating oil and insulating paper in a headspace bottle, seal it with a polytetrafluoroethylene (PTFE) bottle cap, and place the sealed headspace bottle in an aging box for accelerated thermal aging experiments , the aging temperature is set to 130°C;
[0050] (4) After...
Embodiment 2
[0065] Obtain the insulating paper sample of accelerated aging 6 days according to the aging experiment procedure in embodiment 1
[0066] S1. Processing of insulating paper samples:
[0067] (1) Preparation of equipment and reagents: iron stand, alcohol lamp, asbestos net, test tube (with double hole stopper), glass catheter, 50mL glass bottle (with double hole stopper), sink (filled with water and ice cubes), acetonitrile, Dry N 2 gas.
[0068] (2) Experimental procedure: In an environment with a temperature of 2°C, dry the oil on the surface of the insulating paper sample, cut it with scissors until it is pulverized, and weigh 1.00 g of the insulating paper. Put the weighed insulating paper into the test tube, the test tube is connected to two conduits through a punching piston, and one conduit is continuously passed into dry N 2 Gas, another conduit as the outlet pipe of the gas, which passes through the N 2 The flow rate was 1 mL / min. After the air in the test tube i...
Embodiment 3
[0080] This embodiment is to prove the thoroughness of the method for extracting methanol or ethanol from insulating paper in this method.
[0081] Taking the insulating paper aged for 25 days in the accelerated aging experiment as a sample (the equilibrium temperature is room temperature), according to the steps of the detection method in this application, control different heating times, and test the concentration of methanol or ethanol in acetonitrile. The experimental data are shown in Table 1 .
[0082] The concentration of methanol or ethanol in acetonitrile corresponding to different heating times in table 1
[0083]
[0084] It can be seen from the data in the table that after the heating time is greater than 80 minutes, the concentration of methanol or ethanol in the acetonitrile obtained by the test does not change significantly, which shows that heating for 80 minutes can completely volatilize the methanol or ethanol in the insulating paper, that is, from the ins...
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