lightning arrester , Misunderstanding of standard lightning impulse sparkover voltage and residual voltage(English ver)
If you simply memorize shock wave drawings such as the residual voltage and standard lightning impulse sparkover voltage of the lightning arrester due to the electrician's practical skills or writing, you cannot get high scores in the engineer's test or department class.
A false example is as follows.
Most of the lightning strikes think that the surge enters the outside and the standard lightning impulse sparkover voltage first, but this is a wrong example.
The correct example is as follows.
When a thunderbolt enters the transmission line, the voltage rises at the commercial frequency, causing a rapid current to the arrester through the commercial frequency discharge start voltage, the residual voltage is caught by the arrester, and then the voltage is lowered from the rated voltage to the standard lightning impulse sparkover voltage to protect the transformer.
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