RECTIFIERS :


Variac (conventional)

 

These units are made up of diodes and air or oil cooled variac to control current stepless.

Advantages :

 

i. Rugged and reliable.
ii. Easy servicing and maintenance.
iii. Limited ripple content.

Disadvantages :

 

. Bulky and space consuming.
ii. Low efficiency.
iii. Slow response to auto process control.
iv. Not suitable for periodic servicing.
v. Susceptible to overheating in air cooled versions.