The invention discloses a low-air-pressure insulation support direct-current
pollution flashover experiment testing device and method. The device comprises a
voltage-multiplying rectification direct-current power supply and an artificial climate chamber. The method comprises the following steps: pretreating a
test sample, and removing lipid substances and other
dirt residues by using an absolute ethyl
alcohol solution; the
contamination method of the
test sample comprises the following steps: simulating
contamination by adopting a
solid layer method, simulating soluble substances by using NaCl, and simulating insoluble substances by using kaolin;
drying the sample in the shade, and standing for 24 hours until a surface
dirt layer is dried; when a low-pressure environment is generated, putting the
test sample into an artificial climate laboratory, and after determining that the artificial climate laboratory is completely sealed, starting to exhaust until a target pressure is reached;
wetting the
test object, namely
wetting a
dirt layer of the
test object insulator by adding steam mist into the climate chamber; and pressurizing operation is carried out, pressurizing is started to carry out a flashover test when sufficient
wetting is carried out, and the pressurizing method is a uniform pressurizing method. The method has the advantages that by considering that a low-air-pressure area in China is inland and natural
contamination components are not single, the contamination process is simulated by adopting a
solid layer method, the
simulation environment of a test sample is closer to a real environment, and the experiment is more accurate; by utilizing the
automatic control of the
phytotron, the air pressure value of the environment where the
test object is located can be more accurately controlled, so that the low-pressure environment is more truly simulated, and a technical means is provided for an external insulation low-pressure
discharge test.