Causes of Over Voltages | New Topic [2024]

In this note, we are going to learn about some Causes of Over Voltages. Welcome to Poly Notes Hub, a leading solution for diploma engineering notes for polytechnic students.

Author Name: Arun Paul.

Over Voltage Causes

Below we listed some causes of over voltages –

1. Lightning Strikes: Lightning strikes near power lines or utility equipment can cause a sudden increase in voltage, resulting in over voltages in electrical systems.
2. Switching Operations: Switching actions in power systems, such as opening and closing circuit breakers, can result in transient over voltages due to the abrupt change in current flow.
3. Faults in Power Lines: Over voltages can be caused by defects such as short circuits or line-to-ground faults, which interrupt the system’s regular voltage level.
4. Resonance: Over voltages can be caused by resonance in electrical systems, which occurs when the system’s natural frequency equals that of the voltage that is applied.
5. Electromagnetic Interference (EMI): External sources of electromagnetic interference, such as radio frequency interference (RFI) and electromagnetic pulses (EMP), can cause overvoltages in electrical systems.