Question

if the conduction angle of SCR is 120 degrees then the firing angle is
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Answer 1

SOLUTION-;

• In electrical engineering there are variables which are periodic in nature. They have time period and repeats. Voltage, current, charge are cyclic quantities. In 50 Hz system period is 20 ms and repeats in every 20 ms. It is also expressed in degree or radians. One cycle time or one period is considered as 360 degrees. In total for 50 Hz, 360 degree conduction means conducts for 20 ms. 90 degree conduction means 5 ms conduction. From conduction angle one can decide how long it conducts in one cycle time.