Uninterruptible Power Supply Classification

What is an uninterruptible power supply (UPS)?

Uninterruptible power supply (UPS) is a crucial component in the data center power system for providing backup power when the primary power source fails. Not all UPS systems are the same. They vary greatly in topology, size, capacity, form factor, etc.

What are the different types of uninterruptible power supplies?

There are two main categories of uninterruptible power supplies (UPSs) 1, static and rotary. As the name implies, static UPSs do not have any moving parts in their con-verters. Whereas, rotary UPS use mechanical parts that rotate, such as motor/gen-erators, to function. This paper focuses only on static UPSs.

What is a rotary uninterruptible power system?

A UPS is normally referred to as an uninterruptible power supply, but it’s also known as uninterruptible power system. Note that rotary UPS are covered in IEC 88528-11:2004 Reciprocating internal combustion engine driven alternating current generating sets - Part 11: Rotary uninterruptible power systems - Perfor-mance requirements and test methods.

What is the 3rd part of ups output performance classification?

The third part of UPS output performance classification is dynamic output perfor-mance which describes the output voltage variations that occur during changes in operating mode (first character – i.e. when transferring between normal, bypass, and stored energy operating modes) and with the application or removal of load (second character).