Thyristor Over Voltage Protection

Product Categories: Electronics, Engineering Equipment, Power Electronics Lab, Power Electronics Lab

Product Page: https://www.labappara.com/product/thyristor-over-voltage-protection/

Product Description

Thyristor Over Voltage Protection

SCRs can be employed for protecting other equipment from over-voltages owing to their fast switching action. The SCR employed for protection is connected in parallel with the load. Whenever the voltage exceeds a specified limit, the gate of the SCR will get energized and trigger the SCR. A large current will be drawn from the sup­ply mains and voltage across the load will be reduced. Two SCRs are used—one for the positive half-cycle and the other for negative half-cycle, as shown in figure. Resistor limits the short-circuit current when the SCRs are fired. Zener diode in series with resistors consti­tutes a voltage-sensing circuit.