OnLine Power Power Wave 4 - Manual (Page 12)

6005-145 Rev. A 1-1
1. SYSTEM OVERVIEW
1.1. Construction of the ELI
General Topology
The ELI system is composed of input breakers, input filter & protection
network, rectifier, battery bank, inverter, static switch, bypass breaker,
isolation transformer and output filter. The basic topology is shown in the
diagram above. Under normal AC mode, energy from the AC source is
converted to DC power and supplied to the inverter to charge the batteries to its
full capacity all the time, ready to support the output load in case of AC source
failure.
Although the principle and operation of a ELI seems simple and
straightforward, the requirement for a reliable and intelligent ELI makes the
design and manufacturing of a high power ELI one requiring advanced
technology, intelligence, experience and most important, consideration of the
user interface. Many years have been spent in designing the most rugged,
intelligent and reliable ELI for the market, and a safe and convenient ELI for
the user.
Choosing the best and most suitable ELI for a given application can be easy or
difficult, depending on the client’s knowledge of key parameters. The most
obvious specification, output power, depends on the size of the load. Often, an
allowance of 50% more power is added to the present load requirement, both
for tolerance and for future expansion.