Kabelkavitering

Kabelkavitering, a Dutch term translating to "cable cavitation," refers to the phenomenon of bubble formation and collapse within the insulating fluid of high-voltage power cables. This process is driven by fluctuations in electrical stress, temperature, and pressure that occur during the operation of the cable. Under normal operating conditions, the insulating fluid, typically oil or a synthetic compound, maintains its dielectric properties. However, transient stresses, such as those caused by load changes or short circuits, can lead to localized areas of reduced pressure.

When the pressure drops below the vapor pressure of the insulating fluid, small vapor bubbles form. This process is known as cavitation. As the electrical field fluctuates or the pressure increases, these bubbles collapse. The rapid collapse of these vapor bubbles generates localized shock waves and high temperatures. Over time, repeated cycles of bubble formation and collapse can cause significant mechanical and electrical degradation of the cable's insulation material.

This degradation can manifest as increased partial discharge activity, a precursor to insulation breakdown. If left unaddressed, kabelkavitering can lead to premature cable failure, resulting in power outages and costly repairs. Monitoring and managing operational parameters like temperature and load are crucial to minimize the risk of kabelkavitering. Advanced diagnostic techniques can also be employed to detect early signs of this phenomenon within power cable systems.