Frequency of flashovers of clearances in low-voltage ac power circuits due to overvoltage waves
✍ Scribed by A. Michel
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 725 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1430-144X
No coin nor oath required. For personal study only.
✦ Synopsis
The frequency distribution of the crest values of overvoltage waves in low voltage AC power circuits can be approximated by an exponential function. The flashover probabiliQP of a clearance with an impulse withstand voltage & in an electrical equipment is given by P = exp (-a &). The annual number offlashovers of a single clearance in an unprotected house wiring system supplied by an unprotected overhead network depends upon the impulse withstand voltage, the latitude of the network, the annual number of thunderstorm days, the effective length and the height above ground of the overhead line. However, this does not mean, that ever?/ flashover triggers a dangerous power frequency follow current.