Method for discriminating hydrophobic migration characteristics of silicone rubber based on different salt components
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A technology of hydrophobic mobility and discrimination method, which is applied in the direction of analyzing materials, measuring devices, instruments, etc., and can solve problems such as not being able to meet the operating environment
Active Publication Date: 2018-11-06
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Taking NaCl as the main measure of hydrophobic migration characteristics cannot meet the requirements of the operating environment
Method used
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Embodiment 1
[0047] Example 1. Migration Test and Discrimination of DC Grade C Pollution Silicone Rubber
[0048] The method of the present invention is used to simulate the direct current Class C pollution, to pollute the silicone rubber, and test the hydrophobicity. The test results are shown in Table 2 below.
[0049] Table 2. Migration test results of DC grade C dirty silicone rubber
[0050] Migration time (h)
NaCl
CaCl 2
(NH 4 ) 2 SO 4
24
5
96
120.9
21.4
114.8
144
126.5
28
122.2
[0051] According to the test results, first calculate the hydrophobic angle migration saturation value θ Na and θ NH4 .
[0052] For NaCl, there is θ Na-144h -θ Na-96h / θ Na-96h =(126.5-120.9) / 120.9=6.44%Na = θ Na-144h =126.5
[0053] For (NH 4 ) 2 SO 4 , with θ NH4-144h -θ NH4-96h / θ NH4-96h =(122.2-114.8) / 114.8=4.63%NH4 = θ NH4-144h =122.2
[0054] Next, calculate the 96h steady-state ratio of NaCl migration r...
Embodiment 2
[0063] Example 2. Migration test of DC grade D dirty silicone rubber
[0064] According to the same calculation method, the data of different silicone rubbers can be obtained. Table 4 lists two groups of direct current class D pollution migration data:
[0065] Table 4. Migration data of DC grade D dirty silicone rubber
[0066]
θ Na
r Na
θ NH4
r NH4
θ NH4-96
θ Ca-24
θ Ca-96
RTV-1
112.1
0.933
112.3
0.92
103.3
4
17.1
RTV-2
119.4
0.944
113.9
0.934
106.4
7
20.5
[0067] Characterized by NaCl, θ Na1 =112.1, θ Na2 =119.4, the RTV-2 migration speed is faster, and the hydrophobicity is better when the migration is saturated; with (NH 4 ) 2 SO 4 Characterization, the migration speed of RTV-2 is faster, and the hydrophobicity of the two is equivalent when the migration is saturated; 2 Characterization, Heavy CaCl 2 In polluted areas, the hydrophobicity of RTV-1 and RTV-2 ...
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Abstract
The invention provides a method for discriminating hydrophobic migration characteristics of silicone rubber based on different salt components. The method comprises the following steps: respectively preparing soiling solutions with the salt components of NaCl, CaCl2 and (NH4)2SO4 and an ash component of diatomite; testing the hydrophobicity of samples treated by the soiling solutions with different salt components at different migration times, wherein the testing time is 24h, 48h, 96h and 144h after migration respectively; determining a saturation value of a hydrophobic migration angle, calculating indexes of the hydrophobic migration characteristics according to hydrophobic migration testing results, and discriminating the hydrophobic migration characteristics. By the method, the seven indexes of the hydrophobic migration characteristics are creativity used for comprehensively evaluating the characteristics of the silicone rubber; by the method, through a simulation test based on a variety of soiling solutions, the hydrophobic migration characteristics of the silicone rubber are comprehensively evaluated, so that laboratory test results are more closely related to field application.
Description
technical field [0001] The invention belongs to the field of hydrophobicity detection of insulating materials, and in particular relates to a method for judging the hydrophobicity migration characteristics of silicone rubber based on different salt components. Background technique [0002] Pollution flashover of external insulation has always been a major threat to the safe operation of power systems. Silicone rubber composite insulators have many advantages such as excellent pollution flashover resistance, and are widely used in power systems in my country. Hydrophobicity is one of the most important parameters of silicone rubber materials, and plays a very important role in the anti-pollution flashover performance of silicone rubber composite insulators. The evaluation of hydrophobicity is an important aspect in the antifouling performance and long-term aging performance evaluation of composite insulators. [0003] With the increase of operating time, the gradual aging o...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 张洋刘辉贾然周超刘传彬刘嵘张皓孙晓斌黄振宁马国庆秦佳峰史方芳王玥娇
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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