Analyze breakdown in liquid dielectric material
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heya,
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because of their inherent properties, appear as though they would be more useful as insulating materials than either solids or gases. This is because both liquids and solids are usually 103 times denser than gases and hence, from Paschen’s flaw it should follow that they possess much higher dielectric strength of the order of 107 V/cm. Also, liquids, like gases, fill the complete volume to be insulated and simultaneously will dissipate heat by convection. Oil is about 10 times more efficient than air or nitrogen in its heat transfer capability when used in transformers. Although liquids are expected to give very high dielectric strength of the order of 10 MV/cm, in actual practice the strengths obtained are only of the order of 100 kV/cm.
It is used mainly as impregnants in high voltage cables and capacitors, and for filling up of transformers, circuit breakers etc. Liquid dielectrics also act as heat transfer agents in transformers, and as arc quenching media in circuit brealcers. Petroleum oils (Transformer oil) are the most commonly used liquid dielectrics. Synthetic hydrocarbons and halogenated hydrocarbons are also used for certain applications. Fm very high temperature application, silicone oils and fluorinated hydrocarbons are employed. However, it may be mentioned that some of the isomers of poly-chlorinated cliphenyls (generally called askerels) have been found to be very toxic and poisonous, and hence, their use has been almost stopped.
here is ur answer,
because of their inherent properties, appear as though they would be more useful as insulating materials than either solids or gases. This is because both liquids and solids are usually 103 times denser than gases and hence, from Paschen’s flaw it should follow that they possess much higher dielectric strength of the order of 107 V/cm. Also, liquids, like gases, fill the complete volume to be insulated and simultaneously will dissipate heat by convection. Oil is about 10 times more efficient than air or nitrogen in its heat transfer capability when used in transformers. Although liquids are expected to give very high dielectric strength of the order of 10 MV/cm, in actual practice the strengths obtained are only of the order of 100 kV/cm.
It is used mainly as impregnants in high voltage cables and capacitors, and for filling up of transformers, circuit breakers etc. Liquid dielectrics also act as heat transfer agents in transformers, and as arc quenching media in circuit brealcers. Petroleum oils (Transformer oil) are the most commonly used liquid dielectrics. Synthetic hydrocarbons and halogenated hydrocarbons are also used for certain applications. Fm very high temperature application, silicone oils and fluorinated hydrocarbons are employed. However, it may be mentioned that some of the isomers of poly-chlorinated cliphenyls (generally called askerels) have been found to be very toxic and poisonous, and hence, their use has been almost stopped.
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