A Modular, Uninterruptible AC Power Plant for Telecommunication Loads

After a brief analysis of the power requirements of various telecommunication AC load this paper describes some different uninterruptible power plants presently adopted and compares them from the point of view of performances and reliability. It is then presented a type of uninterruptible AC power plant installed in many SIP (Italian Operating Telephone Company) exchange officies. It is characterized by high modularity and reliability, coupled to an unusually high power efficiency, taking into account the low voltage level of the DC link. The results of many years of experience with this type of equipments are reported, confirming the validity of the chosen solution.