On-Load Tap Changer Cleaning via Friction Signal

The cleaning action is performed preliminarily before the actual switching operation. The method checks cleaning parameters (such as contact resistance or time since last cleaning) and only actuates the changeover switch for cleaning when necessary, rather than performing frequent routine cleaning. This preliminary check approach reduces unnecessary switching operations while maintaining contact cleanliness.

The system uses its own switching operation to clean its contacts - the changeover switch cleans itself during normal operation. By monitoring cleaning parameters and triggering cleaning only when needed, the system performs self-maintenance without external intervention, reducing the frequency of deliberate cleaning cycles and extending service life.

The system continuously monitors cleaning parameters such as contact resistance and determines whether cleaning is needed based on measured values. This feedback mechanism allows the system to distinguish between contacts that need cleaning and those that don't, avoiding unnecessary switching operations that would cause voltage fluctuations. The feedback loop ensures cleaning is performed only when contact conditions deteriorate below acceptable thresholds.

The invention changes the operational parameters by introducing cleaning parameter thresholds and conditional logic. Instead of fixed scheduling or continuous switching, the system adjusts its behavior based on measured parameters (contact resistance, time since last cleaning), performing cleaning only when parameters indicate degradation. This parameter-based control reduces unnecessary operations and associated voltage fluctuations.