olemus
10 ms kuni 10 min kestev võrgusageduslik liigpinge

IEEE 1159:
the increase in the root mean square voltage level to 110% - 180% of nominal, at the power frequency for durations of ½ cycle to one minute

ülevaateid
https://www.fluke.com/en/learn/blog/power-quality/what-are-voltage-sags-dips-swells-and-transients

http://electricity2all.blogspot.com/2013/05/over-voltage-and-voltage-swell.html

http://www.powerqualityworld.com/2011/04/voltage-swell-power-quality-basics.html

vt ka
- pingelohk