Power system Transients of power systems

Transients

1. POWER SYSTEM TRANSIENTS

2. TRANSIENTS: Transients are momentary changes in voltage or current that occur over a short period of time. The interval is usually of 1/16 of a voltage cycle or about 1 milli second.

3. Types of Transients Whose 77% of peak-peak voltage of pure component is of one polarity This type is characterized by swings above and below the normal line voltage Raises in 0.1ms and lasts more than 1ms Lasting b/n 50ns to 1ms Frequency component b/n 0.5 and 5Mhz Frequency component upto 5khz Frequency component b/n 5 and 500khz It has a duration of 50ns

4. Reflected and Refracted Waves

5. Open Circuited Line

6. Short Circuited Line

7. Line terminated by a cable

8.         Refracted Voltage Refracted Current Reflected Voltage Reflected Current