What is the effect of changing the firing angle?

As the firing angle increases, the output voltage is more chopped compared to the input, and therefore the mean output voltage decreases. Consequently, the firing angle determines the amount of power a thyristor passes to the load.

What is the effect of increase of firing angle over motor speed?

Supply Power Factor: It is evident from Fig. 20 that, the supply power factor decreases as the firing angle is increased keeping motors’ speeds constant. Fig. 21 that, the motor current ripple factor of M2 increases with the increase of either the firing angle or the motor speed N2.

What is the impact of firing angle on AC side power factor?

Equation (1), if firing angle increases, supply power factor decreases. For inductive loads, this decreasing of supply power factor starts from load power factor angle (or say, load phase angle), as to load power factor, that is, equal to cosine of load phase angle.

How do you change the firing angle of a thyristor?

The firing angle control is achieved by varying the time of application of Gate pulses to the SCR. The voltage to the Gate terminal of the SCR can be applied at a given time decided by the remote input.

What is thyristor firing angle?

Firing Angle of SCR is defined as the angle measured from the instant SCR gets forward biased to the instant it is triggered.

What is relation between firing angle of thyristor and speed control?

The motor speed is directly proportional with the firing angle in modes 0/2 and 0/2/3 and inversely proportional in mode 2/3 as shown in Figure 4. The system operates in a highly distorts supply current especially in light loads and low firing angle which occurs in modes 0/2 and 0/2/3. …

What is firing angle of a thyristor?

What is the relation between firing angle of thyristor and speed control?

For what value of firing angle the output voltage is maximum?

Explanation: Output voltage is maximum if a = 0 and is minimum if a = 180°.

What is firing angle of thyristor?

Firing Angle of SCR is defined as the angle between the instant SCR would conduct if it were a diode and the instant it is triggered. SCR must be forward biased i.e. its anode voltage must be positive with respect to cathode voltage.