Spänningsdippar

Spänningsdippar, also known as voltage dips or sags, are short-duration reductions in the root-mean-square voltage of an electrical power system. These events are typically characterized by a decrease in voltage that lasts for a few cycles to a few seconds. Spänningsdippar are a common type of power quality disturbance and can have various causes, including faults on the power grid, the sudden connection or disconnection of large electrical loads, or faults within a customer's facility.

The magnitude and duration of a spänningsdipp depend on several factors, such as the nature of the disturbance, the location of the fault relative to the affected equipment, and the impedance of the power system. While brief spänningsdippar may go unnoticed by most electrical equipment, more severe or prolonged events can lead to significant problems. Sensitive electronic equipment, such as computers, programmable logic controllers (PLCs), and variable speed drives, can malfunction or shut down unexpectedly during a spänningsdipp. This can result in data loss, production interruptions, and costly downtime.

Mitigation strategies for spänningsdippar include the use of uninterruptible power supplies (UPS), voltage stabilizers, and surge protective devices. For industrial facilities, proper system design, fault current limiting devices, and robust grounding practices can also help reduce the impact of voltage sags. Understanding the causes and effects of spänningsdippar is crucial for maintaining reliable power quality and ensuring the proper operation of electrical equipment.