Ylijännitys

Ylijännitys, often translated as overvoltage, refers to a condition where the voltage in an electrical system exceeds its normal operating level. This can occur due to various reasons, including lightning strikes, switching surges, faults within the power grid, or even issues with connected electrical equipment. In a power system context, ylijännitys can manifest as transient or sustained overvoltages. Transient overvoltages are short-duration events, while sustained overvoltages persist for longer periods.

The effects of ylijännitys can range from minor inconveniences to severe damage. Sensitive electronic components are particularly vulnerable to overvoltage, which can lead to malfunction, degradation, or complete failure. In power distribution systems, ylijännitys can stress insulation, potentially causing flashovers or equipment breakdown. This can result in power outages and costly repairs.

To mitigate the risks associated with ylijännitys, protective measures are employed. Surge protective devices (SPDs) are commonly used to divert excess voltage away from sensitive equipment and safely to the ground. These devices act as a gate, allowing normal voltage to pass through but clamping down on excessive voltage. Proper grounding and insulation are also crucial in preventing and limiting the impact of overvoltages. The design and maintenance of electrical infrastructure play a significant role in managing the likelihood and severity of ylijännitys events.