induzierte atmosphärische Vibration

[Daggi]

Frage an Elektiker, Physiker oder Meteorologen:

Was soll eine induzierte atmosphärische Vibration sein ("Induced Atmospheric Vibration"). Die englischsprachige Wikipedia meint:  the page "Induced Atmospheric Vibration" does not exist.

Thermisch bedingte Verlängerung von Draht-Leitungen mit der Möglichkeit von Berührungen/Kurzschlüssen? Warum jetzt und nicht im Sommer? Windbedingte Schaukelbewegungen von Hochspannungsleitungen mit kurzen Kurzschlüssen?

[Daggi]

Eine KI (deepSeek - China) meint:

Induced Atmospheric Vibration (IAV) in high-voltage power lines refers to low-frequency oscillations (typically 0.1–10 Hz) caused by corona discharge effects near the conductors. Here's a brief breakdown:

Cause:

When high-voltage lines operate near their corona inception threshold, ionization of surrounding air molecules occurs, creating space charges (ions and electrons).

Under certain conditions (e.g., high humidity, rough conductor surfaces), these charges interact with the electric field, generating periodic electrohydrodynamic (EHD) forces.

Mechanism:

The EHD forces induce pressure waves in the air, causing vibrations in the conductor or nearby objects (e.g., insulators).

Unlike aeolian vibration (caused by wind) or galloping (large-amplitude motion), IAV is driven purely by electrical-atmospheric coupling.

Effects:

Usually low amplitude but can contribute to fatigue over time.

May exacerbate other vibration modes or cause audible hum.

Mitigation:

Smooth conductor surfaces (e.g., polished or coated wires).

Optimized voltage gradients to minimize corona.

IAV is less common than mechanical vibrations but is studied for its unique electromechanical interactions. ...

The vibrations can lead to fatigue cracks and loosened hardware.