alijännityksen

Alijännitys, often translated as undervoltage or voltage sag, is a temporary reduction in the AC electric power system's voltage. This occurs when the voltage on one or more phases drops below a specified threshold for a short duration, typically ranging from half a cycle to a few seconds. Alijännitys is distinct from a complete power outage, where the voltage drops to zero.

The causes of alijännitys are varied and can include starting large electric motors, short circuits in the power distribution system, or faults on transmission lines. Unexpected surges in demand from industrial processes or household appliances can also lead to a temporary dip in voltage.

The effects of alijännitys can range from minor to significant. Sensitive electronic equipment, such as computers, variable speed drives, and programmable logic controllers, can malfunction or shut down unexpectedly. Industrial machinery may experience reduced performance or damage. In some cases, alijännitys can trigger protective relays, leading to broader system disruptions. Recognizing and mitigating alijännitys is crucial for maintaining stable and reliable power supply in both industrial and residential settings. Monitoring and analysis tools are often employed to detect and diagnose the root causes of these voltage disturbances.