Causes of Over voltages
The over voltages on a power system may be broadly divided into two main categories viz.
1. Internal cause is not large in magnitude and normally is twice the nominal voltage of the system this type of surge is take care by provide the proper insulation to the system or equipment , and the following are example of causes of internal over voltage
- Switching
- Insulation failure
- Arcing ground
- Resonance
2. External causes i.e. lightning
Surges due to lightning are very severe and may increase the system voltage to several times
the normal value. the over voltage protective device are designed mainly to take care of surge due to lighting
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