Occurrence of Pollution Flashover Accidents of Glass Insulators
Time:
2023-05-26 10:55:27.311
With the continuous development of the times, my country's economic level has gradually improved, and power companies have achieved rapid development and achieved good results. Glass insulators are an important part of the power supply system, but flashovers often occur Safety accidents, how much do we know about the causes of flashover safety accidents? Let me introduce them to us below.
The use of glass insulators in power engineering applications can cancel the energization timing protection test carried out by composite insulators during operation. This is because every damage of the explosion-proof glass will lead to the damage of the composite insulator, and it is easy for the operation personnel to see it during inspection. When the composite insulator is destroyed, the glass shards around the steel cap and iron feet are stuck, and the impact toughness of the remaining part of the composite insulator can prevent the suspension insulator from breaking off.
In glass insulator flashover accidents, different residues have different characteristics, and there are generally differences in the damage caused to distribution lines. If the debris on the route is ordinary dust, it is easy to remove it after being washed by precipitation, and the interference caused to the glass insulator is small. And if the residue is industrial dust, it has a strong adhesion ability. In wet conditions, it will make it form a conductive film on the surface of the glass insulator, which is difficult to be washed away by precipitation. Therefore, this Such residues will cause significant damage to composite insulators. Some soot contains chemical substances such as aluminum oxide, calcium hydroxide, and sodium oxide. These chemical substances are relatively dry, making their resistors relatively large, and their electrical conductivity is not very good, which may interfere with glass insulators. Small, not likely to have significant risks.
In rainy and snowy weather, these substances will absorb water, turning these substances into a positive ion state, greatly reducing the resistance of the substance, increasing its conductivity, and thus The amount of current is greatly increased, and the damage to glass insulators is increased. Moreover, when the leakage current in the line increases, the degree of adhesion of glass insulator surface residues is different, or in areas with different levels of humidity, the damage caused will also be different. In areas with low adhesion or humidity , It will quickly generate heat, volatilize the water, increase the resistance of this area, and thus increase the voltage of this area. When this voltage is higher than the compressive strength, a partial discharge will start to occur in this area. At this time, when the current is adjusted, the entire voltage is distributed to the glass insulator, and then A flashover condition has occurred.
The above is the cause of the flashover safety accident of glass insulators that we introduced to you. According to the article, there are various types of residues, and the possibility of flashover safety accidents is particularly high. Therefore, strengthening the removal of glass insulators is the key actual meaning.
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